JP5996557B2 - Fiber reinforced reinforcing bars containing molded parts and concrete panels containing molded reinforcing bar parts - Google Patents

Description

  The present invention relates to a method of manufacturing a “rebar” in which a reinforcing bar reinforced with fiber or a part thereof along a length is bent or formed from a straight path of the reinforcing bar. Also relates to concrete panels that contain parts.

  The term “rebar”, as used herein, is intended to include hollow bars and rods, ie tubes. Its outer surface is preferably an annular cross section, but this need not be the case. The rod can be of any length.

  The use of fiber reinforced plastic (FRP) rods in architecture, ships, mining, etc. has increased over the years. This is because FRP has many advantages, non-chemical or seawater corrosion, non-metallic (or non-magnetic) and non-conductive, about 2-3 times the tensile strength and 1/4 weight of steel reinforcing rods, This is because it has a coefficient of thermal expansion that is more compatible with concrete or rock than steel rods. Most streaks are often produced by a pultrusion process and have a linear or homogeneous profile. A conventional pultrusion process involves pulling a bundle of reinforcement (eg, fibers or fiber filaments) from its source, by passing the reinforcement through a resin bath in an open tank (preferably a thermosetting polymer resin The process of moistening and impregnating the fibers), pulling the resin infiltrate and resin impregnated bundles through the mold to align the fiber bundles and processing them into a suitable cross-sectional structure, and the tension on the filaments A step of curing the resin with a mold while maintaining the temperature. The resulting product generally has a very high tensile strength in the longitudinal direction (i.e., in the direction in which the fiber filaments are pulled) because the pultrusion process is completely whole body without the fibers being cut or shortened. Have. Typical pultrusion techniques are described in Goldworthy's US Pat. No. 5,057,086, Fuwa's US Pat.

  FRP uniform profile or linear rods have several advantages in many industrial applications. The rod is corrosion resistant, has high tensile strength, and is light in weight. Previously, steel rods or bolts with engraved threads were widely used in engineering practice. However, according to a follow-up study of mortar-packed steel bolts by Sweden, it was found that the quality of the stuffing material was insufficient at 50% of the target and that many bolts were significantly corroded. In contrast to steel bolts, FRP bolts are corrosion resistant and can be used simultaneously with temporary supports and final linings, and the construction cost of one lining tunnel with FRP lock bolts is 33% to 50% less than conventional tunnels using concrete. The FRP rock bolt system is durable and supports the structure as long as it lasts as part of the final lining. Furthermore, due to its seawater corrosion resistance, FRP bolts and anchors have also proven to be excellent solutions at watersides (eg coastal or offshore breakwaters) to strengthen concrete structures. In general, fiberglass rods / bolts are already an important gap market and will become an increasingly important product for the mining and construction industries. There is a great need for structural reinforcement in these industries that provides cost-effective and long-term reliability. Synthetic rebars will last almost forever, so restoration and maintenance savings will be important for such industries.

  The mining industry requires composite rods for tunneling or tunnel roof bolts. These rods are usually carried manually and placed overhead in a mining tunnel, so that fiberglass rods are twice as strong at a weight of 1/4 of the steel bars currently widely used. There is gain. The fiberglass rod also does not damage the mining equipment. In construction industries such as bridges, roads, breakwaters and buildings, steel reinforcements are widely used, and most steel reinforcements corrode after several years of service life. Typically, structures containing steel bars are often demolished after a period of time. Therefore, the use of corrosion resistant synthetic reinforcing bars has increased in the construction industry in recent years.

  Traditional steel bars are typically bent at the ends, but can be naturally bent at other locations along the length of the rod to form hooks, loops, or corners. it can. Such bending is often required for many purposes such as attaching rods to other parts.

  Of course, the FRP rebar made of thermosetting resin is naturally not bent after the rod is formed. In an effective and commercial way that the bend does not significantly impair the use of the rod with respect to strength, with respect to the method of forming such a bend in the rebar using a thermosetting resin, To date, it has been an important open issue.

US Pat. No. 3,793,108 US Pat. No. 4,394,338 US Pat. No. 4,445,957 US Pat. No. 5,174,844

  One of the objects of the present invention is to provide a method of forming a fiber reinforced bar manufactured using a thermosetting resin, the fiber reinforced bar being in one or more portions along its length. Including bends.

According to one aspect of the invention, a method of forming a muscle is provided, the method comprising:
Forming an extensible body from components extending in the longitudinal direction of the reinforcing fibers, the components being generally arranged longitudinally relative to the body fed forward along its length; Process,
A step of infiltrating the extensible body with an uncured curable resin that has penetrated into the constituent fibers;
Providing a holder for receiving a single extensible body;
Attaching the holder to rotate around the axis,
Providing a plurality of engaging members on the holder at spaced positions around the shaft;
A step of winding the main body around the holder so that the main body to be delivered is wound from one engaging member to the next engaging member while the resin is not yet cured. Partially wrapped around the engagement member, the straight portion of the body extending between each engagement member and the next engagement member,
Each engagement member has an axially separated surface portion that extends at an angle and is formed to mold the bend into the required bent shape;
Providing a relative motion between the body and the holder as they are fed forward to wind the body around the holder at a stepped position along the engagement member; and
Curing the resin on the holder while the body is wound thereon.

  Preferably, each engagement member is a next engagement member with a selected predetermined distance to define the required length between each bend and the next bend. It is arranged at a distance from. Thus, when a muscle is cut right next to a bend, it defines a straight portion that is equal in distance and length. However, the muscle can also be cut at different locations, for example in the middle between the bends. In this case, the length of the straight line portion is still predetermined, but half that distance.

  Preferably, when the holder is filled with adjacent portions of the body aligned along the engagement member, the winding stops and the resin hardens after the winding stops. Preferably, to achieve this individual cure, the holder is removed when wrapping stops and the resin is cured when the holder is removed. However, curing may be achieved in an ongoing process while the holder continues to rotate.

Preferably, the relative movement between the body and the holder is obtained by indexing the holder along the axis. This can be done by moving the holder along a mounting on the drive system.

  Preferably, the holder has an outer ring that is in the drive.

  Preferably, the engaging member is arranged on the holder in order to adjust its position. In this way, different dimensions of the linear part and different angles of wrapping can be achieved.

  Preferably, the engaging member is a line parallel to the axis.

  Preferably, each engagement member or bar has a series of grooves spaced along the bar, each slot containing a respective bend in the body.

  Preferably, the holder is arranged so that the number of engaging members or bars can be changed. That is, the number may be only two to provide a wrap angle of 180 degrees, four to provide a wrap angle of 90 degrees, or any other number depending on the angle that changes as appropriate. .

  Preferably, the holder is arranged so that the engaging member can be adjusted radially on the shaft. As a result, the distance between members or lines is changed.

  Preferably, the holder operates around the axis at an angular velocity that picks up the body at a constant linear velocity. That is, the main body is fed from the supply source and wound around the holder at a constant speed.

  In an additional option, the body can be bent at a second bent portion in the opposite direction to form a second bent portion, the second bent portion being said bent portion by a second engagement member. Has an angle bent in the opposite direction. In this option, the second bend is formed by first wrapping the engaging member or line and then inserting the second engaging member, i.e. an additional line, and at the same time originally to the shaft. The internal movement of the muscle engages with the additional muscle by releasing multiple bodies.

  In one arrangement, the body is cut at one bend to form one body having one straight portion and one bend.

  In another arrangement, the body is cut between the bars to form a U-shaped rebar with two straight sections and one bend of 180 degrees between the two straight sections. This arrangement is achieved by molding a U-shaped rebar with a concrete panel with a straight portion inside it and a bend exposed at one edge to form a lifting loop. Can be used. In this case, the method can include the step of lifting the edge using a loop to lift the concrete panel. In this case, the loop is cut after the concrete panel is pulled up to the required position. Since the loop is a FRP rebar member, leaving an end on the surface of the concrete panel eliminates the problem of corrosion and therefore does not require covering and coating.

  Preferably, the step of forming the reinforcing bar comprises providing a series of longitudinally extending components inside the reinforcing fibers arranged longitudinally relative to the muscle, and surrounding the longitudinally extending component inside Providing at least one winding of at least one wound component.

  This wrap may be part of the structure in that it is intended to remain in place after roving is complete and during use. Alternatively, a wrap may be provided for the purpose of maintaining the integrity of the structure while wrapping around the muscle for the bending process. In this case, the wrapping may not make any structural contribution to the finished rebar, either just used to bundle the bundle, or removed as a sacrificial material after curing is complete, Or it can be discarded. In some cases, the particulate matter can be adhesively attached to the outer surface of the rebar if the rebar is complete for further adhesion to the embedded material.

  If the winding is structural, it is generally helical. However, a longitudinally extending wrapping material can be used. That is, the wrapping material can be wrapped around the muscle or simply cover the muscle.

  When the winding part is helical, preferably the winding part comprises first and second helical winding parts in opposite wrapping directions, the resin being a longitudinally extending component and the wrapping part Both penetrate and form an integrated structure with the penetrated resin.

  Preferably, the muscle has an outer surface portion extending along at least approximately the entire length of the muscle, where the inner roving portion has been applied by the first and second wraps during curing. It has its part exposed or swollen outward by tension between the first and second wraps, the swollen part being longitudinally between the material to be reinforced and the inner roving. In order to engage the material to be strengthened to transmit the load, the components of the outer surface portion of the muscle that is bumpy exposed are defined.

  While the internal component is preferably or typically a roving section, other materials or other types known to those skilled in the art can also be used. The internal components are preferably wrapped in one or both directions, but this is not necessarily so. Again, the wrap is preferably or typically a roving section, but other materials such as mats or yarns or other types known to those skilled in the art can be used.

  It is a second object of the present invention to provide a concrete panel that uses shaped reinforcing bars produced according to the above.

According to a second aspect of the present invention, a concrete panel is provided,
The concrete panel is
Multiple U-shaped rebar elements,
Molded concrete elements with embedded reinforcing bar elements,
Each rebar element has two straight sections and one bend of 180 degrees forming a loop between the two straight sections,
The loop is exposed at one edge of the concrete element to lift the concrete panel;
The reinforcing bar element is formed from a roving portion of reinforcing fibers generally arranged vertically with respect to a main body into which a thermosetting resin has penetrated through the roving portion.

  Preferably, the reinforcing bar element comprises a series of longitudinally extending components inside the reinforcing fibers arranged longitudinally with respect to the reinforcing bar element, and is wrapped around at least one of the longitudinally extending series of internal components. Providing at least one helical wrap of one component.

  Preferably, the at least one helical wrap comprises first and second helical wraps in opposite wrapping directions, and the resin is present in both the longitudinally extending component and the wrap. Infiltrate and form an integrated structure with the infiltrated resin.

  Preferably, the body has a portion of the longitudinally extending component exposed or bulged outwardly by tension applied by the wrap during curing, between the first and second wraps. The swollen portion of the outer surface portion of the muscularly exposed muscle is used to engage the material to be reinforced to transmit a longitudinal load between the material to be reinforced and the internal roving. Define the component.

FIG. 3 is a side view of a part of a reinforcing bar manufactured by a method according to the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. FIG. 3 is a cross-sectional view similar to the cross-sectional view of FIG. 2 at an enlarged scale. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a schematic side view of the outline | summary of the method of forming the reinforcing bar of FIG. FIG. 6 is an isometric view of the holder and drive system of FIG. FIG. 6 is a side view of the holder and drive system of FIG. 5. FIG. 6 is a side view of the holder of FIG. 5 removed for curing. FIG. 6 is a side view of the holder of FIG. 5 modified to include a reduced number of engagement bars. FIG. 6 is a side view of the holder of FIG. 5 modified to show an optional method for forming additional bent portions in opposite angular directions. It is a side view of the concrete panel formed using the reinforcing bar manufactured by the holder of FIG.

  In FIG. 1, a reinforcing bar generally represented by (10) is shown. This is formed using the method described in detail below to form the straight portion (100) and the bend (101).

  The basic muscle structure is formed using the method shown and described in Applicant's published US 2008/0261042, the disclosure of which is repeated as follows for completeness.

  The muscle (10) has a first portion (11) that extends along substantially the entire length of the muscle along with a second portion (12) that extends a portion of the length of the muscle. The streaks are typically formed in an architecture that continues without a break so that the first and second portions are repeated alternately. The length of the second part is generally only shorter than the length of the main part (1), so that, for example, the main part is 12 feet long and the second part This part may be only 6 inches long.

  The reinforcing bars are formed only from the resin material (14) that passes through the reinforcing fibers including the reinforcing fibers (15) in the longitudinal direction and the wound reinforcing fibers (16) and (17).

  The longitudinal reinforcing fibers (15) constitute the main volume of the structure, so that the resin content is generally also configured as 90-97% longitudinal fibers and 3-10% wound fibers. Yes, the resin content is about 20-30% by weight.

  The structure of the region of the part (11) is formed without compressing any of the fibers by a pultrusion process. Thus, the inner core formed by the longitudinal fibers (15) or the outer wraps (16 and 17) do not both pass through the die structure so that they are formed in the material as they are formed. It is free to take an arrangement as determined by tension.

  The resin cures without the use of heat, but may be a two-part resin that is more preferably a thermosetting resin, such as microwave heating, forced air heating, infrared heating, RF Heating or at least one metal fiber is heated by any one of many available heating techniques such as induction heating included in the structure to absorb electromagnetic energy. Thus, heat is applied to the structure, resulting in resin curing without contacting the structure with a heating device. In this way, the fibers in the first part (11) can be placed freely according to their tension, and the resin inside the resin so that the resin extends through both the longitudinal fibers and the wound fibers. Take the position.

  In order to obtain this situation in which the resin (14) extends outward to the outer surface (18) and penetrates all of the fibers, both the longitudinal fibers and the wound fibers are preferably used, preferably using a bathing or dipping process. By infiltrating, the fibers are completely encased in the resin before entering the molding system generally described above and detailed in the inventor's US patent.

  The wetting of the fibers ensures that the resin penetrates the entire structure of the outer surface (18).

  The wound fibers (16) and (17) ensure that this portion of the longitudinal fibers in contact with the wound fibers is pressure-free because pressure is lacking due to any shape definition of the die through which the longitudinal fiber core passes. The longitudinal fibers are squeezed inward to inflate the longitudinal fibers in the part (19). Thus, there is a portion of the longitudinal fiber between each wrapped strip of fiber, which is squeezed outward and swollen so that it is preferably slightly raised from the outer surface of the wound fiber Stick out.

  The wound fibers are of course spaced apart in the longitudinal direction by a helical winding action so that the width of the wound fibers is less than the width of the swollen middle part (19).

  Typically, the wound fibers in each direction can be spaced about 1-3 inches apart. However, wider / narrower spacings may be used if the longitudinal fibers are properly controlled and there is sufficient space to ensure a bulge between wraps.

  The wound fibers may be wound as a single roving section in a single starting point winding process or as multiple roving sections applied in a multiple starting point winding process. In such a process with multiple starting points, the number of adjacent roving parts may be in the range of 3-10. The number of roving parts or the thickness of the roving part at the winding position may vary depending on the diameter of the core.

  The winding action occurs in both directions so that when the wound fibers intersect, for example as shown at (20), they overlap each other. In this technique, the swollen portion is generally diamond-shaped in the front view and is squeezed at the top and bottom by the winding action of the wound fiber. Thus, the swollen portion (19) is separate and separated by the wound fibers, but the longitudinal fibers are properly housed and held in the structure by the upper and lower wraps of the swollen portion. .

  The preparation of the winding part tends to accommodate and position the inner longitudinal roving part symmetrically in both directions and maintain the roving part in the longitudinal direction when tension is applied. Thus, the full strength of the longitudinal fibers in the longitudinal direction is maintained and is not reduced or impaired by the tendency of the longitudinal fibers to twist. Twisting the longitudinal fibers as described above can significantly weaken the strength by continuously loading different fibers, which can lead to continuous failure. In addition, wrapping in the opposite direction corresponds to the torsional moment applied to the rod in both directions.

  Thus, the bulging portion (19) is at the outer surface (18) for the muscles to engage the material embedded therein. Thus, if the material to be reinforced is concrete, the concrete hardens around the reinforcement and engages the swollen portion (19). Therefore, the longitudinal load from the concrete to the reinforcing bar is transmitted not only to the wound portions (16) and (17) but also to the swollen portion (19). Because of the angle to the longitudinal direction, the wound portion is less capable of accommodating longitudinal tension than it is capable of accommodating longitudinal fibers that are longitudinal and continuous. Thus, by transmitting the load in the longitudinal direction to the swollen portion (19), the load is transmitted to the longitudinal fibers and is movable in the longitudinal direction or from the outer surface (18). Avoid transmission to elements that can be peeled off. Since the swollen part (19) is a part of the fiber in the longitudinal direction, it cannot of course move vertically.

  However, the outer surface may be free of further bonded protruding elements such as dust or sand that are generally applied to the outer surface of the reinforcing bar as described above.

  The fact that the resin penetrates from both the longitudinal and wound fibers to the outer surface (18) ensures that the wound fibers are effectively bonded to the structure.

  The second portion (12) is formed periodically along the muscle as it is formed by clamping the portion of the muscle in the fastening die. The locking die may move with the structure as it moves forward, or the movement can be stopped while the action by the clamp occurs and hardening occurs in the clamped position. Generally, the clamped portion begins to form before the remaining portion of the muscle begins to move to the heated portion to complete the curing action. The fixing die is formed in a polygonal shape such as a square, and by squeezing both the wound fiber and the longitudinal fiber, a desired external shape (22) as shown in FIG. 4 is obtained. These fibers are formed. The action of the clamp may squeeze the fibers together and reduce the cross-sectional area by squeezing the resin from the structure. The longitudinal fibers are stretched by the clamp portion, and the wound fibers are also stretched by the clamp portion as shown in FIG. Thus, the wound fibers in both directions of winding are clamped to the structure with a polygonal second portion (12).

  Instead of a polygonal shape, any other non-circular shape such as a flat compressed shape may be used.

  As a further alternative, the bumpy rebar may be formed to include a hole through the fiber to provide a connection to the anchor.

  Thus, the second portion (12) is formed so that the muscle is grippable by a chuck element or other clamping element, so that it is around its axis during muscle insulation under certain circumstances. It can be rotated. By winding the fibers (16) and (17), the rotation of the second part (12) is reliably transmitted to the torsional moment over the length of the muscle by the wound parts (16) and (17).

  In one example of the use of this type of arrangement, the streaks can be inserted into holes drilled in rock during mining situations and drilled holes filled with the appropriate resin. The effect caused by the swollen portion (19) due to the stirring action in the resin caused by the rotation of the muscle that grips the second portion (12) and rotates the first portion (11). In a typical stirring action, it spreads through holes around the periphery. Thus, the streaks can be glued in place within a drilled hole, for example, to act as a reinforcement for mining the structure at the roof portion of the mine.

  In another alternative use of this type of reinforcing bar, the tip of the drill is attached to one part (12), the line is gripped by another part (12), and the line can rotate with the tip of the drill. This is possible, causing a drilling action in which the muscle opens the hole while moving the muscle directly into the drilled hole. The streaks can then remain in the same location and the selected drill tip may be of a fully disposable type so that it can be discarded in the hole.

  Again, due to the direct connection between the polygonal part (12) of the muscle and the main part caused by the presence of the wrapping fibers (16) and (17) inside the resin, the polygonal part and the main part (11) The load can be transmitted between the two.

  The arrangement described herein has been found to be significantly advantageous in that it improves embedding strength, a factor used to calculate parameters for concrete reinforcement. Thus, the shape of the outer surface (wrapping in both directions, longitudinal strand bulge) provides a high degree of attachment using an adhesive material (concrete or epoxy resin). This higher mechanical adhesion results in a higher embedding strength.

  The arrangement described herein has been found to be significantly advantageous in that it provides improved crack width control. Crack width measurement is another factor used to calculate the parameters for reinforcement in concrete with the intention of maintaining a low crack width factor. When designing for crack control reinforcements, due to the nature of this product and its high embedding strength, a smaller factor depending on adhesion can be used (for example, sand coated streaks use 0.8). Smooth pultruded streaks would be higher). A low modulus depending on adhesion leads to a smaller crack width or to less reinforcement required for the same crack width.

  In FIGS. 5-8, the method of manufacturing the reinforcing bar which has a linear part (100) and a bending part (101) is shown. This method forms an extensible body (23) that is fed forward along its length from a supply assembly (21), generally from a roving section of reinforcing fibers arranged longitudinally relative to the body. A conventional system (20) is included. The main body (23) is infiltrated with an uncured curable resin that has penetrated by the roving section in the bathtub (22). The body (23) is fed forward by the drive and guidance system (23A) and moved forward to ensure a constant delivery to maintain a predetermined tension, or More generally, by controlling the delivery from the source (21), it is delivered from this system at a predetermined speed, which may vary depending on various factors. pay attention to.

  The body (23) is fed from the former (22) to a holder or reel (24) for receiving one extensible body attached to a drive system (25) for rotation about an axis. The holder generally comprises a reel (26) that includes a plurality of streaks (27) arranged at spaced intervals around the axis of the reel.

Thus, the holder comprises a hub (28), which has a plurality of laterally extending positions to support the streaks (27) at spaced locations on the outside of the hub or on the axis of the hub. Includes a directional rail (30).
The transverse rail (30) has a plurality of engagement members or bars (27) at positions spaced about the axis (31A) with each bar parallel to the axis (31A). Support.

  Each bar (27) is generally cylindrical with an outer surface (33) for receiving a bar body (23) that is wrapped around a reel. Each rebar (27) has a series of grooves (34) spaced axially on its outer peripheral surface, each groove (34) coinciding with the outer periphery of the rebar main body (23). It has a radius of curvature and width prepared to do. Thus, as the reel rotates about its axis, the rebar main body is put into each groove (34) in turn along the line (27), the groove being at a specific position on the line (27). The rebar main body is held at a fixed interval from the next winding portion of the main body. Therefore, each winding part and the next winding part do not contact. To maintain a rebar body that is generally limited to a cylindrical shape, at least one wrap of at least one element is wrapped around an internal roving.

  This wrap may be part of the structure in that it is intended to remain in place after roving is complete or while in use. Alternatively, the wrap may be provided to maintain structural integrity while wrapping around the streak for the bending process. In this case, the wrapping may not make any structural contribution to the finished rebar and is only used to bundle the bundle, or the material may be used as a sacrificial material after curing is complete. It can be removed or discarded. In some cases, the particulate matter can be adhesively attached to the outer surface of the rebar if further adhesion to the material in which the rebar is embedded is complete.

  If the winding is structural, it is generally helical. However, a longitudinally extending wrapping material can be used. That is, the wrapping material can be wrapped around the muscle or simply cover the muscle.

  The muscle (27) has a radius of curvature around the muscle that is prepared to receive and form each bend of the body. Thus, in the figure where the streaks (27) are shown as cylindrical, the radius of curvature of this cylinder matches the intended radius of curvature of the desired bend to be formed. Of course, only the muscle (27) contacts the rebar body over a portion of the periphery of its outer surface (33) which is approximately 90 degrees in the arrangement with four muscles as shown in FIG. . This portion of the external surface (33) must match the shape of the bend that is formed. The remaining portion of the bar around the remaining 270 degrees does not come into contact with the rebar main body (23) at all and may be of any shape.

  While the resin remains uncured, the body wraps around the holder so that the delivered length of the body wraps from one engagement member to the next, resulting in bending of the body The portion is partially wrapped around each engagement member, and the straight portion of the body extends between each engagement member and the next engagement member. Thus, each engagement member has an angularly separated surface portion that extends to form a bend into the desired bend shape and extends at an angle. The drive system (25) rotates the reel by moving the hub (28) around the axis (31A), and the relative motion between the rebar main body (23) and the holder (24) when fed forward. The body (23) is wrapped around the holder line (27) in a stepped position along the line (27) defined by the groove (34).

  As shown in FIG. 8, when the holder is filled, that is, when each of the grooves (34) is engaged with a part of the reinforcing bar body, the resin of the reinforcing bar body remains with the main body (23) wound around the holder. Hardens on the holder. That is, when the holder is filled with adjacent portions of the body disposed along the engagement member, the wrapping stops, the resin hardens after the wrapping stops, the holder is removed, and a suitable oven (50) or Placed in other heating systems.

  Of course, each muscle (27) is placed a distance from the next muscle to define a desired length between each bend and the next bend. The For this reason, the position of the muscle (27) along the rail (30) can be set, for example, at a desired position parallel to the axis (31A) while sliding the muscle inside. And can be adjusted by defining a locking system.

The drive system (25) includes towers (251 and 252) for supporting each end of the hub (28) or the hub may be cantilevered from one tower. . The hub is moved by a drive train (253) mounted on the base frame (254). The relative movement between the body (23) and the holder (24) is guided by the body (23) in a fixed feeding position defined by the drive and guide system (23A) and along the axis (31A). Obtained by indexing the holder (24). The indexing operation is shown in FIG. 6 in which the indexing motor includes a suitable drive system, which may be a worm, chain, or rack, or other mechanical drive system. (258) by moving the frame (254) supporting the hub (28) along the external support frame (257). The indexing movement across the frame (257) may be constant and may be stopped if necessary, the rebar body is placed in the groove and thus the axial direction defined by the groove Note that it is held and guided by a groove that is appropriately arranged in the holder at a distance from the holder. Thus, the holder is moved around the axis using a constant torsional moment to apply a constant tension to the reinforcing bar body (23). In order to achieve a constant linear winding speed, the angular speed of the hub (28), and hence the streaks (27) around the axes, is such that the radial position of the winding position on each streak is inside and outside the axes. Must be different at different angular positions around the axis.

  Once filled, the holder can be easily removed from the drive system by removing the hub from the tower and moving the holder towards the oven (50) (FIG. 8). The holder can then be replaced with a second empty holder in the appropriate number of holders, allowing continuous production where the filled holder is cured while another empty holder is being wound.

  The holder may be of various diameters that allow various positions of the muscle (27). For example, the reel can have a diameter of as much as 25 feet, at which many different positions of the muscle can provide many different bar numbers and positions for different wrap angles of the bend. It is. Typically, the rebar body is bent with a radius of curvature that matches the diameter of the rebar body so that the outer surface (33) of the rebar (27) is generally always the same diameter regardless of the wrap angle. This diameter of the surface of the bar naturally corresponds to the width of the groove of the diameter of the reinforcing bar to be formed. Thus, different reels are provided for rebars with different diameters, for example 0.5 inch, 1.0 inch, or 1.5 inch, which reels have a dedicated rebar diameter for which they are designed. All the required shapes can be achieved.

  In FIG. 8, the holder is arranged so that the number of engaging members is changed. That is, leaving only two streaks, two of the streaks (27) are removed, allowing wrapping around each streak of 180 degrees.

  9 and 10 show a method of bending the reinforcing bar body (23) with the second bent portion (40) in the opposite direction having an angle bent in the opposite direction to the bent portion formed by the muscle (27). Has been.

  Therefore, as shown in FIG. 9, the rebar main body (23) is first wound around the streaks of the reel (26) in the same manner as described above. When this winding is complete and the reel is ready to be removed, or after the reel is removed, the second bend can be inserted by inserting a second engagement member or line (42) into the reel. And by moving the second engagement member or line (42) inward toward the axis (31A) at a position between the lines (27). Thus, FIGS. 9 and 10 also show four equiangularly spaced muscles (27) and four equiangularly spaced muscles (27) located directly between the muscles (27). ing. However, the number and angular spacing of the streaks (27) and (42) may be varied as needed. The initial winding is performed with the streaks (42) removed. Thereafter, the muscle (42) is applied to the reel, and the movement M1 inside the muscle (42) as shown in FIG. 10 causes the plurality of bodies (23) to engage with the second muscle (42). To release the length, the movement of the muscles (27A) and (27B) to the axis (31A) in movement M2 requires that this movement be accommodated. The movement within the muscle (27) can be controlled automatically using the spring (42A) to respond to this movement. In this way, various different designs of bent rebar include bending at different positions and at different intervals, including bending at different wrapping angles, and bending in various directions depending on customer requirements Can be formed.

  After curing is completed in the oven (50), the length of the wrapped portion extending around the streaks (27) is cut at the desired location on the streaks, depending on the shape required. Thus, in one example, to form a series of bodies (23) each having one straight portion extending from one muscle to the next and one bend wrapped around the muscle, (23) is cut at one bend on one side of the muscle (27). In this way, a series of necessary rebar portions are formed by cutting along the length of each rebar (27).

  In another example, the body (23) is cut to form a U-shaped rebar with two straight portions and one bend of 180 degrees between the two straight portions. This is achieved by using only two streaks on the reel and cutting at equidistantly spaced positions between the streaks (27).

  However, these are only examples, and many different shapes can be designed and formed using this system.

  In particular, the U-shaped rebar (55) is shown in FIG. 11, the base of U is indicated by (50), and the legs are indicated by (51) and (52). This U-shaped rebar (55) has a straight portion (51 and 52) inside and a U (50) bend exposed at one edge (54) to form a lifting loop. Molded with panel (53). Thus, the loop (50) has an edge (a row of lifting loops engageable by the lifting system streak (56) to simultaneously lift all the loops in order to lift and carry the concrete panel to the desired position. 54). The loop is cut after the concrete panel is pulled up to the desired position.

  As previously described and shown in FIG. 1, the step of forming the reinforcing bars comprises providing a series of internal rovings of reinforcing fibers disposed longitudinally with respect to the reinforcing bars; Providing a first helical wrap of at least one roving section wound about an inner roving section in a winding direction and wound around an inner roving section in a second winding direction. Providing a second helical wrap of at least one roving section during which the resin penetrates both the internal roving and the wrapping section and is integrated by the infiltrated resin. A step in which a structure is formed.

  The streaks have an outer surface portion that extends along approximately the majority of the length of the streaks, and the inner rovings are exposed to the outside by tension applied by the first and second wraps during curing. A part of the swollen portion between the first and second winding portions, the swollen portion being reinforced to transmit a load between the material to be reinforced and the internal roving portion Define the elements of the external surface portion of the muscle that are bumpy and exposed to engage.

  The internal component is preferably or typically a roving section, but other materials or various types known to those skilled in the art may be used. The internal components are preferably wrapped in one or both directions, but this is not necessarily so. Again, the wrapping section is preferably or typically a roving section, but mats or yarns or various types known to those skilled in the art may be used.

Claims (15)

A method of forming a muscle,
The method
Forming an extensible body from components extending in the longitudinal direction of the reinforcing fibers, the components being generally arranged longitudinally relative to the body fed forward along its length; Process,
A step of infiltrating the extensible body with an uncured curable resin that has penetrated into the constituent fibers;
Providing a holder for receiving a single extensible body;
Step of attaching said tower part the holder in order the holder of the rotating around the axis of the holder,
A plurality of engagement members located at a position spaced angularly about the axis, the step of providing on said holder,
While the resin has not yet cured, the body is sent out to be wrapped from one of said engagement member until the next of said engagement member, comprising the steps of winding the body to the holder, as a result, the is formed by the bent portion of the main body is wound around the each around the engaging member, the linear portion of the body is Ru extending from one of said engaging member to the next of said engaging member includes a step,
Each of said engaging member is formed so as to mold a bent portion to the bent shape required, it has a surface portion separated axially extending angularly,
The method further includes:
For a series of winding winding the body helically to the holder at a position stepped along the engagement member provides relative motion between the body and the holder when fed forward, thereby step individual winding is Ru is kept separate from the next curing and,
Wherein said body while wound on said holder, characterized in that it comprises a step, curing the resin on the holder. Each engagement member is disposed at a distance from the next engagement member to define the required length of the straight portion between each bend and the next bend. The method according to claim 1, wherein: When the holder is filled by the winding of the series adjacent the body aligned along the engagement member, the winding stops and holder is removed, the resin stops wrapped holder after the holder has been removed 3. A method according to claim 1 or 2, characterized in that it cures above. 4. A method according to any one of the preceding claims, wherein the relative movement between the body and the holder is obtained by indexing along the axis.   The method according to claim 1, wherein the engaging member is a line parallel to the axis.   6. The engaging member according to claim 1, wherein each of the engaging members has a series of spaced grooves, each groove accommodating a respective bent portion of the body. The method described.   7. A method according to any one of the preceding claims, characterized in that the holder is arranged such that the engagement member can be adjusted radially on the shaft.   8. A method as claimed in any one of the preceding claims, characterized in that the holder operates around the axis at an angular velocity that picks up the body at a constant linear velocity. The engaging member is
A first engagement member (27) around the outside around which the body is wound; and a second engagement member (42);
The second engagement member to said body to form a second curved portion, the second engagement member (42) bent at the second bent portion of the reversed direction, the second The method according to claim 1 , wherein the bent portion has an angle bent in a direction opposite to the bent portion formed by the first engaging member . The second bent portion is formed by first winding the first engaging member and then inserting the second engaging member, and at the same time, the internal movement of the first engaging member relative to the shaft. 10. The method of claim 9, wherein the second engagement member is engaged by allowing the plurality of bodies to be released .   11. The method according to claim 1, further comprising the step of cutting the body at one bend to form one body having one straight portion and one bend. the method of.   The method includes the step of cutting the body to form a U-shaped reinforcing bar having two straight portions and one bend of 180 degrees between the two straight portions. The method according to any one of 1 to 11. The step of forming the reinforcing bars is a process of providing a series of longitudinally extending components inside the reinforcing fibers arranged longitudinally with respect to the muscles and wrapped around the longitudinally extending components inside 13. A method according to any one of the preceding claims, comprising providing at least one helical wrap of at least one component.   The at least one helical wrap includes first and second helical wraps in opposite wrap directions, and the resin penetrates both the longitudinally extending component and the wrap. 14. The method of claim 13, wherein an integrated structure is formed by the infiltrated resin.   The body has an outer surface portion extending along at least approximately the entire length of the body, where the inner longitudinally extending component is applied by the first and second wraps during curing. A portion of the bulge that is exposed or swollen to the outside by the tension between the first and second wrapping portions, and the swollen portion extends longitudinally between the material to be reinforced and the internal roving portion. 15. A method according to claim 14, characterized in that a component of the outer surface portion of the muscularly exposed muscle is defined to engage a material to be reinforced to transmit the load of the muscle.

Images