JP7040948B2 - Cutting machine and cutting method - Google Patents

Description

The present invention relates to a cutting machine and a cutting method.

A bridge deck is a member that supports passing automobiles and people and transmits the load to structural members such as main girders. Steel decks made of steel are lighter and have a shorter erection period than other types. Therefore, many have been built in Japan since the 1950s. From around the 1970s, a structure having a closed cross-section rib (hereinafter referred to as "U rib") was developed, and it has been widely adopted in highways and the like. However, in recent years, fatigue cracks in deck plates are becoming apparent in such steel decks. Fatigue cracks in the deck plate occur, for example, from the welded portion between the U rib and the deck plate. As a method of repairing, reinforcing, and preventing such fatigue cracks in the deck plate, a method of cutting the connection portion of the U rib with the deck plate and then attaching a reinforcing plate connecting the outer surface of the U rib and the deck plate is used. Proposed. The construction method can be constructed without traffic restrictions.

Patent Document 1 discloses a U-rib cutting method suitable for the above method. In the U-rib cutting method, a rail portion extending along the longitudinal direction of the U-rib is attached to one outer surface of the U-rib, and then the cutting machine is fixed to a slide base movable along the rail portion. Then, by rotating the cutting blade of the cutting machine, the cutting machine is moved along the rail portion together with the slide base while cutting a part of the connection portion of the U-rib with the deck plate. This makes it possible to appropriately cut the connection portion of the U rib and omit the finishing step of the cut surface.

In addition, Patent Document 2 discloses a method of cutting a U-rib using a cutting tool having a reciprocating sawtooth. In this method, the cutting tool is moved along the cutting tool guide jig attached to one side plate of the U-rib, and the one side plate is cut in the vertical direction. The other side plate and bottom plate of the U-rib are similarly cut using a cutting tool guide jig and a cutting tool.

Japanese Unexamined Patent Publication No. 2017-89110 Japanese Unexamined Patent Publication No. 2011-196172

By the way, the steel deck is provided with horizontal ribs extending in a direction orthogonal to the longitudinal direction of the U ribs. In Patent Document 1, an operator manually cuts a portion of the U-rib that intersects the lateral rib at the connection portion with the deck plate (hereinafter, referred to as “attention portion”). However, it is not easy to manually and accurately cut the region of interest.

The present invention has been made in view of the above problems, and an object of the present invention is to easily and accurately cut a region of interest.

In the invention according to claim 1, the end surface of the second plate portion along the vertical direction is joined to the front surface which is the main surface of the first plate portion along the vertical direction, and the end surface of the first plate portion is joined. In a structure in which the upper end surface and the upper end surface of the second plate portion are joined to the lower surface of the cover portion, the first surface facing the end surface of the second plate portion and close to the lower surface of the cover portion. A cutting machine that cuts the attention portion of the plate portion from the front surface side of the first plate portion along the lower surface of the cover portion, and is a long length arranged substantially parallel to the lower surface of the cover portion. The cutting blade is thin plate-shaped and has a tooth portion on an edge extending in the longitudinal direction, and the cutting blade is reciprocated in the moving direction along the longitudinal direction while holding one end of the cutting blade in the longitudinal direction. The cutting machine main body is attached to the front surface of the first plate portion, and the cutting machine main body is movably supported in the feeding direction along both the front surface of the first plate portion and the lower surface of the cover portion. The cutting machine main body is tilted at a predetermined inclination angle with respect to the direction perpendicular to the feeding direction and along the lower surface of the cover portion . The holder to which one end of the cutting blade is detachably fixed, the holder guide that guides the holder in the moving direction, and the cutting blade are arranged on the side opposite to the lower surface of the cover portion. A moving mechanism for reciprocating the holder in the moving direction is provided, and the cutting blade having one end fixed to the holder heads toward one side in the feeding direction as it moves away from the one end, and the cutting machine main body moves. The other holder to which one end of the cutting blade can be fixed, and the other holder in a direction different from the moving direction and along the longitudinal direction of the cutting blade fixed to the other holder. Further provided with another holder guide for guiding one holder, with the cutting blade fixed to the other holder, the cutting blade moves away from one end toward the other side in the feed direction. , The moving mechanism reciprocates the other holder in the other moving direction .

The invention according to claim 2 is the cutting machine according to claim 1 , wherein the holder guide can be replaced with another holder guide in the cutting machine main body, and the other holder guide of the holder guide can be replaced. By exchanging with, the inclination angle of the cutting blade in the longitudinal direction is changed.

The invention according to claim 3 is the cutting machine according to claim 1 or 2 , wherein the structure is a part of a steel deck having a U rib, a horizontal rib and a deck plate, and the first said. The plate portion is a side surface portion of the U rib, the second plate portion is the lateral rib portion, and the cover portion is the deck plate.

In the invention according to claim 4 , the end surface of the second plate portion along the vertical direction is joined to the front surface which is the main surface of the first plate portion along the vertical direction, and the end surface of the first plate portion is joined. In a structure in which the upper end surface and the upper end surface of the second plate portion are joined to the lower surface of the cover portion, the first surface facing the end surface of the second plate portion and close to the lower surface of the cover portion. A cutting method for cutting a portion of interest of a plate portion from the front surface side of the first plate portion along the lower surface of the cover portion, a) the front surface of the first plate portion and the cover portion. A step of forming a cut portion in the first plate portion at a position close to the feed direction with respect to the attention portion in the first plate portion with a direction along both of the lower surfaces as a feed direction, and b) any one of claims 1 to 3 . The present invention comprises a step of inserting the cutting blade of the cutting machine according to one into the cutting portion and moving the cutting machine main body in the feeding direction to cut the attention portion of the first plate portion. ..

According to the present invention, the region of interest of the first plate portion can be easily and accurately cut.

It is a perspective view which shows a part of a steel deck. It is sectional drawing which shows a part of a steel deck. It is a figure which shows the cutting machine. It is a figure which shows the cutting machine. It is a figure which shows the cutting machine. It is a figure which shows the cutting machine. It is a figure which shows the flow of the process of cutting a part of interest. It is a figure which shows the base plate and the cutting machine. It is a figure for demonstrating the cutting of the part of interest. It is a figure for demonstrating the cutting of the part of interest. It is a figure for demonstrating the cutting of the part of interest. It is a figure for demonstrating the cutting of the part of interest.

FIG. 1A is a perspective view showing a part of the steel deck 9, showing a state in which a part of the deck plate 91 is broken. In FIG. 1A, the X, Y, and Z directions orthogonal to each other are indicated by arrows (the same applies to the other figures). In the following description, the vertical direction (Z direction) in FIG. 1A is referred to as a vertical direction. The vertical direction is typically the direction of gravity, but is not limited to the direction of gravity.

The steel deck 9 includes a deck plate 91, a plurality of U ribs 92, and horizontal ribs 93. Each U-rib 92 is long in the Y direction, and the shape seen along the Y direction is a U-shape that opens upward ((+ Z) side). The U-rib 92 includes a lower surface portion 922 arranged on the lower side ((—Z) side) and two side surface portions 923 extending continuously upward from both ends of the lower surface portion 922 in the X direction. The lower surface portion 922 is a plate portion perpendicular to the vertical direction, and each side surface portion 923 is a plate portion along the vertical direction. In the U-rib 92, an internal space is formed by the two side surface portions 923 and the lower surface portion 922. The plurality of U ribs 92 are arranged in the X direction.

The lateral rib 93 is a plate portion along the vertical direction, and extends in a direction orthogonal to the longitudinal direction (Y direction) of the U rib 92. The lateral rib 93 is formed with a recess 931 into which the U rib 92 is fitted. The shape of the edge of the recess 931 when viewed along the Y direction is a U-shape that opens upward. The edge of the recess 931 generally faces the outer surface of the two side surface portions 923 of the U-rib 92 and is joined to these outer surfaces by, for example, fillet welding (may be groove welding or the like; the same applies hereinafter). Will be done. In the example of FIG. 1B showing a cross section of the steel deck 9 perpendicular to the Y direction, a long hole-shaped slit 933 is provided at a position facing the lower surface portion 922 of the U rib 92 in the horizontal rib 93. The edge of the recess 931 is not joined to the lower surface portion 922. Although only one horizontal rib 93 is shown in FIG. 1A, in reality, a plurality of horizontal ribs 93 are arranged in the Y direction.

The upper end surfaces of the two side surface portions 923 of the U rib 92 and the upper end surfaces of the lateral rib 93 face the lower surface 911 of the deck plate 91. These upper end surfaces are joined to the lower surface 911 of the deck plate 91 by, for example, fillet welding. The deck plate 91 closes the upper side of the internal space of the U rib 92. A scallop 932, which is an arc-shaped notch, is provided in the vicinity of the lower surface 911 of the deck plate 91 at the edge of the recess 931 of the lateral rib 93. Due to the scallop 932, the welded portion between the side surface portion 923 of the U rib 92 and the lateral rib 93, the welded portion between the side surface portion 923 of the U rib 92 and the deck plate 91, and the lateral rib 93 and the deck plate 91. It is avoided that the welds between them overlap each other.

Here, when focusing only on the range in which the U-rib 92 exists in the vertical direction, the portion between the two U-ribs 92 adjacent to each other in the horizontal rib 93 can be regarded as one plate portion along the vertical direction. It is possible. Further, in the lateral rib 93, it can be said that the edge of the recess 931 facing the outer surface of the side surface portion 923 of the U rib 92 is the end surface of the plate portion, and the end surface of the plate portion is joined to the outer surface of the side surface portion 923. Has been done. In the following description, in the side surface portion 923 of the U-rib 92, attention is paid to a portion 924 facing the end surface of the plate portion and close to the lower surface 911 of the deck plate 91, and the portion 924 is referred to as “attention portion 924”. Call. Further, the outer surface of the side surface portion 923 of the U rib 92 is referred to as a "front surface". In the example of FIG. 1A, the portion of the side surface portion 923 that overlaps with the scallop 932 when viewed along the X direction is the region of interest 924. The portion of interest 924 is a part of the connection portion of the U-rib 92 with the deck plate 91, and is a portion located in a narrow space inside the scallop 932.

2 to 4 are views showing a cutting machine 1 according to an embodiment of the present invention. FIG. 2 shows the cutting machine 1 viewed from the (−X) side in the (+ X) direction, and FIG. 3 shows the cutting machine 1 viewed from the (+ Y) side in the (−Y) direction. FIG. 4 shows the cutting machine 1 viewed from the (+ Z) side toward the (−Z) direction. 2 and 3 show a state in which the cutting machine 1 is attached to the front surface 925 of the side surface portion 923 of the U rib 92. In FIG. 4, the illustration of the main body support portion 4 described later is omitted. The cutting machine 1 is a device that cuts the attention portion 924 (see FIG. 3) of the side surface portion 923 from the front surface 925 side of the side surface portion 923 along the lower surface 911 of the deck plate 91.

As shown in FIGS. 2 and 3, the cutting machine 1 includes a cutting blade 2, a cutting machine main body 3, and a main body support portion 4. The main body support portion 4 includes a support base 41, two rod support plates 42, two guide rods 43, and two slide blocks 44. As shown in FIG. 2, the support base 41 has a block shape long in the Y direction. The support base 41 is provided with a plurality of mounting holes 411. Each mounting hole 411 is a long hole that is long in the vertical direction, and a plurality of mounting holes 411 are arranged in the Y direction. A base plate 5 is attached to the front surface 925 of the side surface portion 923 of the U rib 92, and the base plate 5 is provided with a plurality of screw holes 51. The support base 41 is attached to the front surface 925 of the side surface portion 923 by inserting the fixing screw 451 into the mounting hole 411 of the support base 41 and tightening the fixing screw 451 with respect to the screw hole 51 of the base plate 5. The attachment of the base plate 5 to the side surface portion 923 will be described later.

Each rod support plate 42 extends perpendicular to the longitudinal direction (Y direction) of the support base 41. The two rod support plates 42 are fixed to both ends of the support base 41 in the Y direction, respectively. Each guide rod 43 extends in the Y direction, and both ends of the guide rod 43 are supported by two rod support plates 42. The two guide rods 43 are arranged apart in the vertical direction. The two slide blocks 44 shown in FIG. 3 are fixed to the cutting machine main body 3. Each slide block 44 has a through hole, and two guide rods 43 are inserted into the through holes of the two slide blocks 44, respectively. The main body support portion 4 having such a structure supports the cutting machine main body 3 so as to be movable in the feed direction along the Y direction.

The cutting blade 2 is in the shape of a long thin plate arranged substantially parallel to the lower surface 911 of the deck plate 91. Typically, the lower surface 911 of the deck plate 91 and the cutting blade 2 are substantially vertical in the vertical direction. As shown in FIG. 4, a saw tooth 21 which is a tooth portion is provided on one edge of the cutting blade 2 extending in the longitudinal direction. No saw blade 21 is provided on the other edge of the cutting blade 2. The edge of the cutting blade 2 may be slightly curved. The length of the cutting blade 2 is, for example, 10 cm. As will be described later, the cutting blade 2 is removable from the cutting machine main body 3 (holder 31). Further, in a state where the cutting blade 2 is fixed to the cutting machine main body 3, the longitudinal direction of the cutting blade 2 is inclined with respect to the X direction.

The cutting machine main body 3 includes two holders 31. The two holders 31 are arranged in the Y direction at the upper part of the cutting machine main body 3. Each holder 31 has a long plate shape, and one end of the cutting blade 2 can be fixed. In the example of FIG. 4, a plurality of screw holes 311 are formed in the holder 31, and a plurality of through holes are also formed at one end of the cutting blade 2. The cutting blade 2 is fixed to the holder 31 by inserting the fixing screw 319 into the through hole of the cutting blade 2 and tightening the fixing screw 319 with respect to the screw hole 311 of the holder 31. The longitudinal direction of the cutting blade 2 fixed to the holder 31 coincides with the longitudinal direction of the holder 31. When using the cutting machine 1, in principle, the cutting blade 2 is fixed to only one of the two holders 31.

A lid plate 34 extending in a direction perpendicular to the vertical direction is provided on the upper portion of the cutting machine main body 3. The lid plate 34 is removable from other parts of the cutting machine main body 3. Two grooves 32 shown by a thin broken line in FIG. 4 are formed on the surface of the lid plate 34 on the (-Z) side. Each groove 32 extends in a direction inclined with respect to the X direction. In the example of FIG. 4, one groove 32 is located on the (+ Y) side toward the (+ X) direction, and the other groove 32 is located on the (+ Y) side toward the (+ X) direction. That is, the two grooves 32 extend in different longitudinal directions. When viewed along the Z direction, the angle θ1 formed by the longitudinal direction of one groove 32 and the X direction is equal to the angle θ1 formed by the longitudinal direction and the X direction of the other groove 32.

The width of each groove 32 is slightly larger than the width of the holder 31. The width of the groove 32 is the width in the direction perpendicular to the longitudinal direction of the groove 32, and the width of the holder 31 is the width in the direction perpendicular to the longitudinal direction of the holder 31. The holder 31 is fitted in each groove 32. The longitudinal direction of the holder 31 fitted in each groove 32 coincides with the longitudinal direction of the groove 32. In the cutting machine 1, each groove 32 serves as a holder guide for guiding the movement of the holder 31. That is, the holder guide 32 guides the holder 31 in the moving direction along the longitudinal direction.

The moving directions of the two holders 31 are symmetrical with respect to the line perpendicular to the Y direction. As described above, the longitudinal direction of the holder guide 32 is inclined by an angle θ1 with respect to the X direction. The longitudinal direction of the cutting blade 2 in the state of being attached to the holder 31 is also inclined with respect to the X direction at an inclination angle substantially the same as the angle θ1. In the cutting blade 2, the saw blade 21 is provided on the edge of the two edges extending in the longitudinal direction, which is farther from the other holder 31 (that is, the front edge in the inclined direction). In the example of FIG. 4, if the cutting blades 2 are attached to both of the two holders 31, the two cutting blades 2 face both outer sides in the Y direction so that the tips of the two cutting blades 2 are separated from each other. Tilt. As will be described later, since the holder 31 and the cutting blade 2 reciprocate along the moving direction, the lid plate 34 is formed with a recess 341 that avoids interference with the fixing screw 319.

The cutting machine main body 3 further includes a moving mechanism 33. The moving mechanism 33 shown in FIG. 4 includes a motor (including a speed reducer) (not shown), a gear 331, and two gears 332. The motor rotates the gear 331 around the central axis J1 parallel to the vertical direction. The two gears 332 are arranged on the (+ Y) side and the (−Y) side of the gear 331, respectively. Each gear 332 is rotatably supported by a bearing or the like around a rotation shaft R1 parallel to the vertical direction. The gear 332 is engaged with the gear 331, and each gear 332 rotates about the rotation shaft R1 due to the rotation of the gear 331. A pin 333 is provided on the upper surface of the gear 332 at a position deviated from the rotation shaft R1. Further, the holder 31 is provided with a slit 312 extending in a direction perpendicular to the longitudinal direction thereof. The pin 333 is inserted into the slit 312. When the pin 333 rotates with the gear 332 about the rotation axis R1, the holder 31 reciprocates along the longitudinal direction (that is, the moving direction) of the holder guide 32 while the pin 333 moves along the slit 312. The cutting machine main body 3 can be manufactured at low cost by, for example, modifying an existing power tool. Of course, the cutting machine main body 3 may be manufactured by a dedicated part.

In the cutting machine 1, the inclination angle (inclination angle with respect to the X direction) in the longitudinal direction of the cutting blade 2 fixed to the holder 31 can be changed. Specifically, as shown in FIG. 5, another lid plate 34a is used in the cutting machine main body 3 instead of the lid plate 34 shown in FIG. In the lid plate 34a of FIG. 5, the angle θ2 formed by the longitudinal direction and the X direction of the holder guide (groove) 32 is different from the angle θ1 in the lid plate 34 of FIG. The other structure of the lid plate 34a is the same as that of the lid plate 34. In this way, a plurality of lid plates 34, 34a having different orientations in the longitudinal direction of the holder guide 32 are prepared in advance, and among the plurality of lid plates 34, 34a, the inclination angle of the cutting blade 2 is a desired angle. Things are used in the actual processing.

Next, the process using the cutting machine 1 will be described. As a means of repairing, reinforcing, and preventing fatigue cracks in the deck plate 91, after cutting the connection portion with the deck plate 91 at the side surface portion 923 of the U rib 92 over the entire length of the U rib 92, the side surface portion 923 and the deck A method of attaching a reinforcing plate that connects to the plate 91 is known. As a part of the construction method, the cutting machine 1 is used when cutting the attention portion 924 facing the lateral rib 93 at the connecting portion of the side surface portion 923.

FIG. 6 is a diagram showing a flow of a process of cutting the attention portion 924 of the side surface portion 923 of the U rib 92 by using the cutting machine 1. Here, a plurality of holes are previously formed in the side surface portion 923 of the U rib 92. Each hole is a through hole that is also used for fixing the reinforcing plate, and is formed by an operator using a drill. The plurality of holes are arranged in the Y direction at regular intervals.

In the cutting process of the region of interest 924, as shown in FIG. 7, the base plate 5 is attached to the front surface 925 of the side surface portion 923 by utilizing a part of the hole portion 942 formed in the U rib 92 (step S11). For example, in the front surface 925 of the side surface portion 923, the base plate 5 is arranged at a position close to the (+ Y) side surface of the lateral rib 93, and the hole portion 52 provided in the base plate 5 and the hole portion 942 of the U rib 92. One end of the bolt 521 is inserted into the U-rib 92 via. At this time, since the hole 52 of the base plate 5 has a long shape in the Y direction, the hole 52 of the base plate 5 is overlapped with the hole 942 of the U rib 92 even when the intervals of the plurality of holes 942 are scattered. It is possible.

The bolt 521 has a movable protrusion 522 (see FIG. 3) that can move forward and backward from the outer surface of the shaft portion. Specifically, in the bolt 521, the movable protrusion 522 is rotatably supported inside the hollow shaft portion about the rotation axis perpendicular to the shaft portion, and the movable protrusion portion is urged by an elastic member such as a spring. The state in which the 522 protrudes from the outer surface is maintained. Further, by pushing the operation portion provided at the outer end (outside of the U rib 92) of the shaft portion, the movable protrusion 522 retracts (immerses) from the outer surface of the shaft portion. In this way, the bolt 521 allows the movable protrusion 522 to move forward and backward (protruding or immersing).

In fixing the base plate 5 with the bolt 521, one end of the bolt 521 is inserted into the U rib 92 via the holes 52 and 942 in a state where the operating portion is pushed in and the movable protrusion 522 is retracted. Subsequently, by releasing the pushing of the operation portion, the movable protrusion 522 protrudes from the outer surface of the shaft portion. Then, the nut 523 provided at the other end of the bolt 521 is tightened. In practice, the base plate 5 is fixed to the side surface portion 923 of the U rib 92 using two bolts 521. In fixing the base plate 5 to the side surface portion 923, a bolt fastened to the hole portion 942 by forming the hole portion 942 as a screw hole may be used, and the base plate 5 is attached to the side surface portion by a magnet. It may be fixed to 923.

Subsequently, the cutting machine support portion 6 shown in FIG. 7 is attached to the base plate 5. Specifically, the cutting machine support portion 6 includes a support base 61 and a guide rail 62. The support base 61 is provided with a plurality of mounting holes. Further, in the base plate 5, a plurality of screw holes 53 are provided above the holes 52. The support base 61 is attached to the base plate 5 by inserting the fixing screw 63 into the mounting hole of the support base 61 and tightening the fixing screw 63 with respect to the screw hole 53 of the base plate 5. When the support base 61 is fixed to the side surface portion 923, the guide rail 62 projects along the lower surface 911 of the deck plate 91 and in the direction away from the side surface portion 923 (-X). The cross section of the guide rail 62 in FIG. 7 perpendicular to the X direction has a trapezoidal shape with two sides along the vertical direction as an upper base and a lower base.

When the cutting machine support portion 6 is fixed to the side surface portion 923 of the U rib 92, the cutting machine 7 is attached to the cutting machine support portion 6. The cutting machine 7 includes a cutting machine main body 71, a cutting wheel 72, and two slide bases 73. The cutting machine main body 71 houses a motor and a speed reducer inside. The cutting wheel 72 has a disk shape and is attached to the upper part of the cutting machine main body 71. The cutting wheel 72 is rotatably supported by the cutting machine main body 71 about an axis parallel to the vertical direction.

The two slide bases 73 are fixed to the side surfaces of the cutting machine main body 71 on the (+ Y) side and the (−Y) side, respectively. Each slide base 73 has a trapezoidal groove extending in the X direction and having a cross section perpendicular to the X direction. The cross-sectional shape of the groove of the slide base 73 on the (+ Y) side is substantially the same as the cross-sectional shape of the guide rail 62. Therefore, the slide base 73 on the (+ Y) side can be engaged with the guide rail 62. By fitting the slide base 73 on the (+ Y) side into the guide rail 62, the cutting machine 7 is supported by the cutting machine support portion 6 in a state where it can move in the X direction. The cross-sectional shape of the groove of the slide base 73 on the (+ Y) side and the cross-sectional shape of the groove of the slide base 73 on the (−Y) side are symmetrical with respect to the lines parallel to the vertical direction. As will be described later, by turning the notch support portion 6 of FIG. 7 upside down and attaching it to the base plate 5, the slide base 73 on the (−Y) side can be engaged with the guide rail 62.

Subsequently, by driving the motor of the cutting machine main body 71, the rotation of the cutting grindstone 72 is started. Then, when the operator pushes the cutting machine 7 toward the side surface portion 923 along the guide rail 62, the cutting grindstone 72 comes into contact with the front surface 925 of the side surface portion 923, and a part of the side surface portion 923 is cut. .. As a result, as shown in FIG. 8A, a cut portion 98a is formed on the (+ Y) side of the lateral rib 93 on the side surface portion 923 (step S12). In FIG. 8A, the deck plate 91 is omitted, and a parallel diagonal line is provided in the cut region on the side surface portion 923 (the same applies to FIGS. 8B to 8D described later). For example, by pushing the cutting machine 7 toward the side surface portion 923 until the slide base 73 or the cutting machine main body 71 of FIG. 7 abuts on the base plate 5, a cutting of a predetermined length (for example, about 10 cm) is made. Part 98a is formed. The cut portion 98a is close to the region of interest 924 in the Y direction. The base plate 5 is formed with a plurality of sets of screw holes 53 having different heights in the vertical direction, and the cutting machine is supported in the vertical direction by selecting the screw holes 53 used for fixing the cutting machine support portion 6. It is possible to adjust the position of the portion 6 and the position of the cut portion 98a to some extent.

When the formation of the cut portion 98a is completed, the rotation of the cutting wheel 72 is stopped. Further, the cutting machine 7 is removed from the guide rail 62 by moving the cutting machine 7 along the guide rail 62 in a direction away from the side surface portion 923. After that, the cutting machine support portion 6 is removed from the base plate 5.

Subsequently, as shown in FIG. 3, the support base 41 of the main body support portion 4 is attached to the base plate 5 while the cutting blade 2 is inserted into the cut portion 98a. At this time, as shown in FIG. 2, since the mounting hole 411 of the support base 41 is a long hole that is long in the vertical direction, the position of the cutting blade 2 in the vertical direction can be easily adjusted according to the cut portion 98a. It is possible. Further, by using the base plate 5 used for supporting the cutting machine 7 as it is for supporting the cutting machine 1, the time required for attaching the cutting machine 1 can be shortened. In the cutting machine main body 3, the cutting blade 2 is attached only to the holder 31 on the (−Y) side.

Subsequently, by driving the motor of the cutting machine main body 3, the reciprocating movement of the cutting blade 2 is started. Then, the operator moves the cutting machine main body 3 toward the lateral rib 93 in the feed direction (that is, along the guide rod 43 facing the Y direction), so that the side surface portion continuous in the feed direction from the cut portion 98a. The 923 site is cut. As a result, as shown in FIG. 8B, a part of the attention portion 924 of the side surface portion 923 is cut (step S13). For example, the cutting machine main body 3 is moved in the feeding direction until the slide block 44 abuts on the rod support plate 42 or the cutting machine main body 3 abuts on the lateral rib 93. At this time, the presence of the scallop 932 in the lateral rib 93 prevents the cutting blade 2 from damaging the lateral rib 93 even when the cutting machine main body 3 is brought close to the lateral rib 93.

When a part of the region of interest 924 is cut, the reciprocating movement of the cutting blade 2 is stopped. The cutting machine main body 3 is moved along the guide rod 43 in a direction away from the lateral rib 93, and subsequently, the main body support portion 4 of FIG. 3 is removed from the base plate 5. After that, the nut 523 is loosened and removed from the bolt 521, and the bolt 521 is pulled out from the U rib 92 in a state where the operating portion of the bolt 521 is pushed in and the movable protrusion 522 is retracted. As a result, the base plate 5 is removed from the side surface portion 923 (step S14).

Subsequently, on the front surface 925 of the side surface portion 923, the base plate 5 is arranged at a position close to the (-Y) side surface of the lateral rib 93, and similarly to the above, the bolt 521 and the nut 523 are used on the side surface portion 923. It is fixed (steps S15, S11). Further, the cutting machine support portion 6 of FIG. 7 is attached to the base plate 5 in a state of being turned upside down. At this time, the position of the cutting grindstone 72 of the cutting machine 7 supported by the cutting machine support portion 6 is substantially the same as the cutting portion formed by the immediately preceding step S13 in the vertical direction. The screw hole 53 of the base plate 5 used for fixing the support portion 6 is selected. Then, by fitting the slide base 73 on the (−Y) side of the cutting machine 7 into the guide rail 62, the cutting machine 7 is supported by the cutting machine support portion 6. By starting the rotation of the cutting wheel 72 and pushing the cutting machine 7 toward the side surface portion 923 along the guide rail 62, as shown in FIG. 8C, the lateral rib 93 (-) in the side surface portion 923. A cut portion 98b is formed on the Y) side (step S12).

When the formation of the cutting portion 98b is completed, the rotation of the cutting wheel 72 is stopped, and the cutting machine 7 is moved away from the side surface portion 923, so that the cutting machine 7 is removed from the guide rail 62. Further, the cutting machine support portion 6 is removed from the base plate 5. After that, the support base 41 of the main body support portion 4 is attached to the base plate 5 while inserting the cutting blade 2 into the cut portion 98b. At this time, in the cutting machine 1, the cutting blade 2 is replaced from the holder 31 on the (−Y) side to the holder 31 on the (+ Y) side. Then, the reciprocating movement of the cutting blade 2 is started, and the operator moves the cutting machine main body 3 toward the lateral rib 93 along the guide rod 43, so that the region of interest of the side surface portion 923 is as shown in FIG. 8D. The rest of the 924 is cut (step S13). As a result, a continuous cutting portion is formed from the cutting portion 98b to the cutting portion 98a.

Here, immediately after the cut portion 98b is formed in step S12, between the cut portion 98b and the cut portion formed from the cut portion 98a (the cut portion formed by the immediately preceding step S13). The position in the vertical direction may be misaligned. In this case, in the plurality of mounting holes 411 in the support base 41 of FIG. 2, the positions fixed to the screw holes 51 by the fixing screws 451 are displaced from each other in the vertical direction, so that the direction of the guide rod 43, that is, the cutting machine The feed direction of the main body 3 is slightly tilted with respect to the Y direction. This makes it possible to cut the side surface portion 923 so that the cut portion 98b and the cut portion are continuous.

When the entire portion of interest 924 is cut, the reciprocating movement of the cutting blade 2 is stopped, and the cutting machine main body 3 is moved along the guide rod 43 in a direction away from the lateral rib 93. After that, the main body support portion 4 is removed from the base plate 5, and the base plate 5 is removed from the side surface portion 923 (step S14). As a result, the cutting process of the region of interest 924 is completed (step S15).

Since the cutting machine 1 is relatively small, the work can be easily performed even when the gap between the U ribs 92 adjacent to each other in the X direction is narrow. In the cutting process of the attention portion 924, after the cut portions 98a and 98b are formed on both sides of the lateral rib 93 by the cutting machine 7, the cutting machine 1 cuts and cuts the attention portion 924 from the cut portion 98a. The site of interest 924 may be sequentially cut from the recess 98b. In this case, two base plates 5 may be attached to both sides of the lateral rib 93 on the side surface portion 923, and each base plate 5 may be used to support the cutting machine 7 and the cutting machine 1.

In practice, at the connection portion of the side surface portion 923 with the deck plate 91, the portion between the lateral ribs 93 adjacent to each other in the Y direction is also cut in another step. When the connecting portion of the side surface portion 923 is cut over the entire length of the U rib 92, a reinforcing plate connecting the front surface 925 of the side surface portion 923 and the lower surface 911 of the deck plate 91 is attached. The reinforcing plate is provided with a plurality of holes along its longitudinal direction (Y direction). Further, the plurality of holes 942 in the side surface portion 923 of the U rib 92 are formed at intervals corresponding to the plurality of holes in the reinforcing plate. By inserting one end of the shaft portion of the one-side bolt into the U-rib 92 via the hole portion of the reinforcing plate and the hole portion 942 of the side surface portion 923, and tightening the nut provided at the other end portion. , The reinforcing plate is fixed to the side surface portion 923 of the U rib 92. The reinforcing plate is also fixed to the lower surface 911 of the deck plate 91. The cutting process of the U-rib 92 and the fixing of the reinforcing plate are sequentially performed on both side surface portions 923 of the plurality of U-ribs 92.

Here, a comparative example in which plasma cutting is adopted as a cutting method of the attention portion 924 on the side surface portion 923 of the U rib 92 is assumed. In plasma cutting, due to the structural reason of the cutting torch, when cutting the very vicinity of the lower surface 911 of the deck plate 91 on the side surface portion 923, it is necessary to incline the plasma injection direction upward. In this case, the lower surface 911 of the deck plate 91 may be damaged. When the plasma injection direction is parallel to the lower surface 911 in order to avoid damage to the deck plate 91, the cutting position of the side surface portion 923 is separated from the deck plate 91 to some extent (for example, about 15 mm). Since there are certain restrictions on the size and shape of the reinforcing plate, when the cutting position of the side surface portion 923 is separated from the deck plate 91, the portion of the side surface portion 923 remaining on the deck plate 91 side and the reinforcing plate come into contact with each other and the deck. The purpose of repairing, reinforcing, and preventing fatigue cracks in the plate 91 cannot be achieved. Further, it is conceivable to cut the attention portion 924 by the cutting machine 7, but in this case, the lateral rib 93 is damaged when the attention portion 924 is cut.

On the other hand, in the cutting machine 1, a long thin plate-shaped cutting blade 2 arranged substantially parallel to the lower surface 911 of the deck plate 91 is provided. Further, the cutting machine main body 3 is arranged on the side opposite to the lower surface 911 of the deck plate 91 with respect to the cutting blade 2, and while holding one end of the cutting blade 2 in the longitudinal direction, the cutting blade 2 is along the longitudinal direction. Move back and forth in the direction of movement. As described above, in the cutting machine 1, the cutting blade 2 is substantially at the uppermost portion, so that the deck plate 91 and the lateral rib 93 are not damaged and are close to the deck plate 91 (for example, close to 5 to 10 mm). At the position, the attention portion 924 of the side surface portion 923 can be easily and accurately cut. Further, since a smooth cut surface can be obtained without causing dross unlike plasma cutting, the finishing step of the cut surface required for plasma cutting can be omitted, and the cutting process of the U rib 92 is compared. It can be completed in a short time. The quality of the cut surface can also be stabilized regardless of the skill and proficiency of the worker.

Further, the main body support portion 4 is attached to the front surface 925 of the side surface portion 923, and the main body support portion 4 moves the cutting machine main body 3 in the feeding direction along both the front surface 925 of the side surface portion 923 and the lower surface 911 of the deck plate 91. Supported as possible. As a result, the cutting blade 2 can be accurately moved along the lower surface 911 of the deck plate 91, and the attention portion 924 can be cut more accurately. Further, the longitudinal direction of the cutting blade 2 is inclined at a predetermined inclination angle with respect to the direction perpendicular to the feeding direction and along the lower surface 911 of the deck plate 91, so that the cutting machine main body 3 is in the feeding direction with respect to the region of interest 924. It is possible to appropriately cut the site of interest 924 in a state of being separated from the center.

In the cutting machine main body 3, the holder guide 32 can be replaced with another holder guide 32, and the replacement of the holder guide 32 changes the inclination angle of the cutting blade 2 in the longitudinal direction. Therefore, when the thickness of the horizontal rib 93 is large, by using the holder guide 32 in which the inclination angle of the cutting blade 2 is large with respect to the X direction, the attention portion 924 can be viewed from one surface side of the horizontal rib 93. It is possible to cut most of the surface (the part deeper than the surface). Further, when the thickness of the lateral rib 93 is small, the contact length between the cutting blade 2 and the side surface portion 923 is shortened by using the holder guide 32 in which the inclination angle of the cutting blade 2 is small, and the region of interest is It is possible to cut the 924 in a short time. In this way, by changing the inclination angle of the cutting blade 2 according to the thickness of the lateral rib 93 and the like, it is possible to appropriately cut the attention portion 924 of the side surface portion 923.

In the cutting machine main body 3, the two holder guides 32 guide the two holders 31 in different moving directions. Then, in a state where one end of the cutting blade 2 is fixed to one holder 31, the cutting blade 2 moves toward one side in the feeding direction as it moves away from the one end, and one end of the cutting blade 2 is attached to the other holder 31. In the fixed state, the cutting blade 2 moves toward the other side in the feeding direction as it moves away from one end. Thereby, the attention portion 924 can be appropriately cut from both main surface sides of the lateral rib 93 by using one cutting machine 1. Further, the cutting machine 1 can be easily miniaturized by reciprocating the two holders 31 by one moving mechanism 33.

Various deformations are possible in the cutting process of the cutting machine 1 and the region of interest 924.

The cutting machine 1 can be used for various structures having the same structure as the steel deck 9 having the U rib 92, the horizontal rib 93 and the deck plate 91. In such a structure, the end surface of the second plate portion along the vertical direction is joined to the front surface which is the main surface of the first plate portion along the vertical direction, and the upper end surface and the first plate portion of the first plate portion are joined. 2 The upper end surface of the plate portion is joined to the lower surface of the cover portion. When viewed along the vertical direction, the second plate portion and the first plate portion are preferably joined in a T shape. The first plate portion and the second plate portion are formed of, for example, a metal or an alloy, and are typically a steel plate. In the steel deck 9, the first plate portion is the side surface portion 923 of the U rib 92, the second plate portion is the horizontal rib 93, and the cover portion is the deck plate 91. In the cutting machine 1, in the structure, the attention portion of the first plate portion facing the end surface of the second plate portion and close to the lower surface of the cover portion is placed on the cover portion from the front side of the first plate portion. It can be easily and accurately cut along the lower surface.

In the above structure, if slight damage to the second plate portion is allowed, the scallop 932 may be omitted in the second plate portion. Further, depending on the length of the first plate portion in the direction perpendicular to the vertical direction, the first plate portion may be cut by the cutting machine 1 from the end portion of the first plate portion in the direction toward the region of interest. The site of interest may be cut without forming a notch.

In the cutting machine 1, a mechanism for moving the cutting machine main body 3 in the feed direction by an electric motor, a spring, or the like may be used. Depending on the material of the first plate portion or the like, the main body support portion 4 may be omitted. In this case, for example, the cutting machine main body 3 is supported by an operator. The cutting blade 2 may be any as long as it can cut the material by reciprocating movement, and for example, a cutting blade having a tooth portion such as a grindstone or a tip saw can be used.

The above-described embodiments and configurations in the respective modifications may be appropriately combined as long as they do not conflict with each other.

1 Cutting machine 2 Cutting blade 3 Cutting machine main body 4 Main body support 9 Steel deck 21 Sawtooth 31 Holder 32 Holder guide 33 Moving mechanism 91 Deck plate 92 U rib 93 Horizontal rib 98a, 98b Notch 911 (deck plate) 923 (U-rib) side surface 924 Attention site 925 (side surface) front surface 931 (horizontal rib) recess S11-S15 Step

Claims (4)

The end surface of the second plate portion along the vertical direction is joined to the front surface which is the main surface of the first plate portion along the vertical direction, and the upper end surface of the first plate portion and the second plate portion are joined. In a structure in which the upper end surface is joined to the lower surface of the cover portion, the attention portion of the first plate portion facing the end surface of the second plate portion and close to the lower surface of the cover portion is the first. A cutting machine that cuts from the front side of the plate portion along the lower surface of the cover portion.
A long thin plate-like cutting blade arranged substantially parallel to the lower surface of the cover portion, and a cutting blade having a tooth portion on an edge extending in the longitudinal direction.
A cutting machine main body that reciprocates the cutting blade in the moving direction along the longitudinal direction while holding one end of the cutting blade in the longitudinal direction.
A main body support portion that is attached to the front surface of the first plate portion and movably supports the cutting machine main body in a feed direction along both the front surface of the first plate portion and the lower surface of the cover portion. ,
Equipped with
The longitudinal direction of the cutting blade is inclined at a predetermined inclination angle with respect to the direction perpendicular to the feed direction and along the lower surface of the cover portion.
The cutting machine body
A holder to which one end of the cutting blade is detachably fixed,
A holder guide that guides the holder in the moving direction, and a holder guide.
A moving mechanism that is arranged on the side opposite to the lower surface of the cover portion with respect to the cutting blade and that reciprocates the holder in the moving direction.
Equipped with
As the cutting blade having one end fixed to the holder moves away from the one end, the cutting blade moves toward one side in the feed direction.
The cutting machine body
Another holder that can fix one end of the cutting blade,
Another holder guide that guides the other holder in a direction different from the moving direction and in another moving direction along the longitudinal direction of the cutting blade fixed to the other holder.
Further prepare
With the cutting blade fixed to the other holder, the cutting blade moves away from one end toward the other side in the feed direction.
A cutting machine in which the moving mechanism reciprocates the other holder in the other moving direction . The cutting machine according to claim 1 .
In the cutting machine main body, the holder guide can be replaced with another holder guide.
A cutting machine characterized in that the inclination angle of the cutting blade in the longitudinal direction is changed by exchanging the holder guide with the other holder guide. The cutting machine according to claim 1 or 2 .
The structure is part of a steel deck with U-ribs, lateral ribs and deck plates.
A cutting machine characterized in that the first plate portion is a side surface portion of the U rib, the second plate portion is the horizontal rib portion, and the cover portion is the deck plate portion. The end surface of the second plate portion along the vertical direction is joined to the front surface which is the main surface of the first plate portion along the vertical direction, and the upper end surface of the first plate portion and the second plate portion are joined. In a structure in which the upper end surface is joined to the lower surface of the cover portion, the attention portion of the first plate portion facing the end surface of the second plate portion and close to the lower surface of the cover portion is the first. It is a cutting method of cutting from the front side of one plate portion along the lower surface of the cover portion.
a) The notch portion in the first plate portion at a position close to the feed direction with respect to the attention portion in the first plate portion with the direction along both the front surface of the first plate portion and the lower surface of the cover portion as the feed direction. And the process of forming
b) The cutting blade of the cutting machine according to any one of claims 1 to 3 is inserted into the cutting portion, and the cutting machine main body is moved in the feeding direction to obtain the first plate portion. The step of cutting the region of interest and
A cutting method characterized by comprising.

Images