JP4306025B2 - Segment gripping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment gripping device that grips while preventing rotation of a segment.
[0002]
[Prior art]
In general, a segment that has been transported on a transport carriage in a tunnel is gripped by a segment gripping device suspended by a hoist, and transferred to an erector by the movement of the hoist. As such a segment gripping device, the one shown in FIG. 8 is known.
[0003]
As shown in the figure, the segment gripping device a is inserted into and extracted from a key hole c formed at a substantially central portion of the segment b, and is rotated 90 degrees after insertion to engage the key hole c, and the key rod d. And a pair of arms g attached to the left and right of the base member f, and a tip of each arm g, respectively. And a pin i that engages with a positioning recess h formed in the segment b. The segment gripping device a is suspended by a hoist suspension hook (not shown) via a wire k attached to a hole j of each arm g. A method for gripping the segment b by the segment gripping device a will be described.
[0004]
First, the key rod d is rotated 90 degrees with respect to the base member f from the state shown in FIG. 8 so that the key rod d can be inserted into the key hole c. The key rod d is inserted into the key hole c and the pin i is engaged with the recess h. Combine. This pin i prevents the rotation of the segment b. Next, the flange member m attached to the upper part of the base member f is removed and the key rod d is dropped further downward to secure a clearance n between the shoulder portion of the key rod d and the shoulder portion of the key hole c. Then, after rotating the key rod d 90 degrees so as not to come out of the key hole c as shown in FIG. 8, the removed flange member m is reattached, and the rotation prevention pin p is attached to the base member f and the key rod d. And let it penetrate. This anti-rotation pin p prevents the key rod d from rotating and prevents the segment b once gripped from falling off. As a result, the segment b is gripped by the gripping device a while being prevented from rotating.
[0005]
[Problems to be solved by the invention]
By the way, in the segment gripping device a, since the key rod d is rotated with respect to the base member f to switch between locking and unlocking with respect to the key hole c, the key rod d is rotated with respect to the base member f. When doing so, an operator must grip the upper end of the rod d to rotate the rod d, and workability is poor. In particular, when the segment b is large, it is necessary for an operator to get on the segment b to work, and workability is significantly deteriorated.
[0006]
Further, since a rotating mechanism (sliding bearing e) for rotating the key rod d with respect to the base member f and a dropping mechanism (flange member m) for dropping the key rod d are required, not only the cost is increased but also the apparatus. This leads to an increase in the overall axial dimension. For this reason, the hoisting allowance of the hoist hanging hook hung on the wire k becomes small, and in the case of a small-diameter tunnel, a situation where the hanging hook cannot be hung on the wire k is also assumed.
[0007]
Further, every time the segment b is gripped, the flange member m and the detent pin p have to be attached and detached, which makes the operation complicated. Further, in addition to the pin i for preventing the rotation of the segment b, a pin p for preventing the rotation of the key rod d is also required in order to prevent the segment b once being gripped from falling off. The attachment / detachment work is also one of the causes of complicated work.
[0008]
An object of the present invention, which was created in view of the above circumstances, is to provide a segment gripping device that can easily perform segment gripping work, has a simple structure, and can promote downsizing of the entire device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a segment gripping device that is suspended by a hoist and grips and transfers a segment, the key is inserted into and removed from a key hole formed in the segment and rotated by a predetermined angle after insertion. A key rod that engages with the hole, an arm that is mounted substantially orthogonal to the key rod, and is provided in the arm so as to be able to protrude and retract toward the segment side, and engages with a positioning recess formed in the segment when protruding. And a pin that separates from the recess when immersed, and a shackle that is provided on an upper portion of the key rod and on which the hoist suspension hook is hung, and a cylindrical body that accommodates the pin is provided at the tip of the arm. The body is formed with a pair of shallow grooves and a pair of deep grooves that are opposed to each other at intervals in the circumferential direction, and the pin is provided with the pair of shallow grooves or the pair of deep grooves. A selectively engaging rod is provided penetrating in the diametrical direction. When the rod is engaged with a shallow groove, the pin is accommodated in a state of being pulled up into the cylindrical body, and the rod is engaged with the deep groove. The pin protrudes downward from the edge tube and engages with the recess of the segment .
[0010]
In order to grip the segment by the segment gripping device, first, the entire device is rotated around the key rod with the pin immersed, so that the key rod can be inserted into the key hole of the segment. Then, after inserting the key rod into the key hole, the entire apparatus is rotated by a predetermined angle, and the key rod is engaged with the key hole. Thereafter, a pin provided on the arm is protruded, and the pin is engaged with a recess formed in the segment to prevent the segment from rotating. Thus, segments are gripped in a state of being prevented rotated in suspended Please segment gripping device to the hoist, Ru is transported by the movement of the hoist.
[0011]
In the present invention, the key rod is rotated not by rotating only the key rod but by rotating the entire apparatus. Therefore, the rotation of the key rod can be achieved by the operator holding the arm attached to the key rod and rotating the entire apparatus, and the workability is greatly improved. Further, since a turning mechanism for turning only the key rod and a dropping mechanism for dropping the key rod are not necessary, it is possible to promote cost reduction and downsizing of the overall axial dimension of the apparatus. In addition, since the pin engaged with the concave portion of the segment serves as both the detent of the segment with respect to the device and the detent of the key rod, a dedicated pin for detent is not required.
[0012]
Another arm may be attached to the key rod on the opposite side of the arm, and a balance weight may be attached to the other arm. In this way, when the operator grasps the arm and rotates the entire apparatus around the key rod, the entire apparatus rotates in a balanced manner without tilting. Therefore, the operation of inserting the key rod into the key hole and the operation of engaging the pin with the recess are facilitated.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
[0014]
As shown in FIG. 1, the segment gripping device 1 according to the present embodiment is inserted into and removed from a keyhole 3 formed at a substantially central portion of the segment 2, is rotated by a predetermined angle after insertion, and engages with the keyhole 3. A key rod 4, an arm 5 attached substantially orthogonally to the key rod 4, and a recess 6 for positioning formed in the segment 2 at the tip of the arm 5 so as to be able to project and retract toward the segment 2 side. And a pin 7 that is withdrawn from the recess 6 when immersed.
[0015]
As shown in FIGS. 2 and 4, the key rod 4 includes a cylindrical portion 8, a tapered cylindrical portion 9, and a flat plate portion 10 that are integrally formed from above to below. The flat plate portion 10 is a substantial key member that is inserted into the key hole 3 and switches between locking and unlocking, and is formed in a minus driver shape, and both shoulder portions 11 are formed in an arc shape. Further, a shackle 12 on which a hoist suspension hook (not shown) is hung is attached to the upper portion of the cylindrical portion 8.
[0016]
The key hole 3 into which the key rod 4 is inserted is formed in a tapered shape in the vicinity of the center of gravity of the segment 2, and an engagement fitting 13 is embedded therein. As shown in FIGS. 1 and 4, the engagement fitting 13 has an opening 14 formed in a rectangular shape along the axial direction of the segment 2 (tunnel). The opening 14 allows insertion when the flat plate portion 10 of the key rod 4 is in the axial direction of the segment 2, and makes it impossible to pull out when the flat plate portion 10 is rotated 90 degrees after insertion. Both shoulder portions 15 inside the opening portion 14 are formed in an arc shape in accordance with both shoulder portions 11 of the flat plate portion 10, and these come into contact with each other when locked.
[0017]
A cylindrical member 16 is fitted on the columnar portion 8 of the key rod 4 and fixed with bolts 17. The arm 5 is attached to the cylindrical member 16 so as to be substantially orthogonal to the key rod 4. A metal ring 18 is attached to the lower part of the cylindrical member 16 as shown in FIG. 2 (b). When the key rod 4 is inserted into the key hole 3, the ring body 18 abuts on a metal ring body 19 attached around the key hole 3. By using a metal touch, the rotational resistance is reduced.
[0018]
A cylindrical body 20 as shown in FIGS. 2 and 3 is attached to the tip of the arm 5. A total of four grooves 21 and 22 are formed in the cylindrical body 20 along the axial direction at intervals of 90 degrees in the circumferential direction. The grooves 21 and 22 are formed such that one set of two (21) facing each other is shallow and another set of two (22) is deep. In the side wall portion of the cylindrical body between the shallow groove 21 and the deep groove 22, high portions 23 and low portions 24 are alternately arranged. A plate 25 formed in a fan shape is attached to the top of the high portion 23.
[0019]
Inside the cylindrical body 20, the pin 7 is accommodated so that it can protrude and retract toward the segment 2 side. As shown in FIGS. 2 and 4, the pin 7 includes a cylindrical portion 26 having an outer diameter slidable in accordance with the inner diameter of the cylindrical portion 20, and a tapered cylinder formed integrally with the lower portion of the cylindrical portion 26. Part 27. The taper of the tapered cylindrical portion 27 is matched with the taper of the recess 6 formed in the segment 2. A rod 28 is attached to the cylindrical portion 26 of the pin 7 so as to penetrate the diameter portion. The rod 28 is selectively engaged with either the pair of shallow grooves 21 or the pair of deep grooves 22.
[0020]
When the rod 28 is engaged with the shallow groove 21 as shown in FIG. 4 (b), the pin 7 is accommodated while being pulled up into the cylindrical body 20, and the rod 28 is received as shown in FIG. 2 (b). When engaged with the deep groove 22, the pin 7 protrudes downward from the cylindrical body 20. At this time, if the key rod 4 is inserted into the key hole 3 of the segment 2, the pin 7 engages with a positioning recess 6 formed in the segment 2 when protruding, and disengages from the recess 6 when immersed. As shown in FIG. 1, the recesses 6 are arranged on both the left and right sides of the keyhole 3 so as to be used for positioning and detent when an unillustrated erector grips the segment 2. .
[0021]
Another arm 29 is attached to the cylindrical member 16 fitted to the key rod 4 so as to be positioned on the opposite side of the arm 5 so as to be substantially orthogonal to the key rod 4. As shown in FIG. 2, the other arm 29 is arranged in a straight line on the extension line of the arm 5. These arms 5 and 29 are configured by joining a horizontal plate portion 30 and a vertical plate portion 31 in a T-shaped cross section. The horizontal plate portion 30 is attached orthogonally to the cylindrical member 16. As shown in FIG. 2B, the vertical plate portion 31 is formed in a taper shape so that the cylindrical member 16 side is wide and the tip end side is narrow, and does not interfere with the inner peripheral surface of the arc-shaped segment 2. It is like that.
[0022]
A balance weight 32 formed in a columnar shape is attached to the tip of another arm 29. The weight of the balance weight 32 matches the weight of the parts (the cylindrical body 20, the pin 7, the rod 28, etc.) attached to the tip of the arm 5 on the opposite side. Here, since the pin 7 is hollowed out to reduce the weight, the weight of the balance weight 32 can be reduced accordingly. Moreover, the length shape of both the arms 5 and 29 is the same. For this reason, when the gripping device 1 is suspended by hooking the hoist on the shackle 12, the entire device 1 is stably suspended like a mobile without tilting.
[0023]
A process of gripping the segment 2 by the segment gripping apparatus 1 having the above configuration will be described.
[0024]
First, as shown in FIGS. 1 and 4, the pin 7 is in a state of being immersed in the cylindrical body 20. Then, by rotating the entire gripping device 1 suspended by the hoist's suspension hook around the key rod 4, the flat plate portion 10 of the key rod 4 is made parallel to the axial direction of the segment 2 (tunnel). Then, as shown in FIG. 5, the hoist suspension wire is drawn out in this state, whereby the key rod 4 is inserted into the key hole 3 and the flat plate portion 10 is passed through the opening 14 of the engagement fitting 13. After the penetration, a predetermined clearance required for rotation of the key rod 4 is formed between the shoulder portions 11 of the flat plate portion 10 and the shoulder portions 15 of the opening portion 14.
[0025]
Next, the key rod 4 is rotated by rotating the entire gripping device 1 by 90 degrees around the key rod 4, and the flat plate portion 10 of the key rod 4 is engaged with the opening 14 of the engagement fitting 13 as shown in FIG. 6. Combine. Thereafter, as shown in FIG. 7, the pin 7 is protruded downward from the cylindrical body 20 provided at the distal end portion of the arm 5, and the pin 7 is engaged with the recess 6 formed in the segment 2. Prevent rotation. The pin 7 appears and disappears by the operator holding the rod 28 and moving the rod 28 from the groove 21 to the groove 22. The clearance 33 between the shoulder portions 11 of the flat plate portion 10 and the shoulder portions 15 of the opening portion 14 is absorbed by the pin 7 falling into the recess 6. As described above, the segment 2 is gripped by the gripping device 1 while being prevented from rotating.
[0026]
In this embodiment, the key rod 4 is rotated not by rotating only the key rod d as in the conventional type shown in FIG. 8, but by rotating the entire device 1. Therefore, the rotation of the key rod 4 can be achieved by the operator holding the arms 5 and 29 attached to the key rod 4 and rotating the entire apparatus 1, and the workability is greatly improved. At this time, the balance weight 32 rotates the gripping device 1 as a whole without being tilted and maintains a vertical state in a balanced manner. Therefore, the key rod 4 is inserted into the key hole 3 and the pin 7 is engaged with the recess 6. Can be easily and reliably performed.
[0027]
Further, in the present embodiment, there is provided a turning mechanism (sliding bearing e) for turning only the key rod d required for the conventional type shown in FIG. 8 and a dropping mechanism (flange member m) for dropping the key rod d. Since it becomes unnecessary, it is possible to promote cost reduction and downsizing of the axial dimension of the entire apparatus. Therefore, even if it is a small-diameter tunnel, the hoisting allowance of the hoist suspension hook hung on the shackle 12 can be secured. Further, since the attaching / detaching operation of the flange member m for dropping the key rod d required in the conventional type shown in FIG. 8 is not required, the operation is simplified.
[0028]
Further, the pin 7 engaged with the concave portion 6 of the segment 2 serves not only as a detent of the segment 2 with respect to the device 1 but also as a detent of the key rod 4 itself, so that it is necessary in the conventional type shown in FIG. The pin p dedicated to the rotation is not necessary. Therefore, the insertion / extraction work of the pin p for exclusive use of the rotation stopper becomes unnecessary, and the work is simplified. Further, in the present embodiment, as shown in FIG. 7, once the rod 28 of the pin 7 is engaged with the deep groove 22, the rod 28 is stably engaged with the deep groove 22 by the weight of the pin 7, so that the pin It is possible to reliably prevent the key rod 4 from rotating out of the recess 6 and being unlocked.
[0029]
Instead of the balance weight 32 provided at the tip of another arm 29, each component (cylindrical body 20, pin 7, etc.) at the tip of the other arm 5 is provided, and both pins 7, 7 are respectively provided. You may make it engage / disengage in the recessed parts 6 and 6 of the segment 2. FIG.
[0030]
【The invention's effect】
As described above, the segment gripping device according to the present invention can exhibit the following effects.
[0031]
(1) The segment gripping work becomes easy. That is, the segment can be gripped by two steps: a step of gripping the arm and rotating the entire apparatus around the key rod, and a step of protruding and retracting the pin to the segment side.
[0032]
(2) The structure of the device is simplified and the overall size of the device can be reduced. Therefore, cost reduction can be promoted, and the cost of hanging the device can be earned.
[Brief description of the drawings]
FIG. 1 is a perspective view of a segment gripping device showing an embodiment of the present invention.
FIG. 2 is an explanatory view of the segment gripping device, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a side view.
FIG. 3 is a perspective view of a cylindrical body that accommodates a pin of the segment gripping device.
FIGS. 4A and 4B are explanatory views showing a method of using the segment gripping device (first step), FIG. 4A is a side view, and FIG. 4B is a front view.
FIGS. 5A and 5B are explanatory views showing a method of using the segment gripping device (second step), FIG. 5A is a side view, and FIG. 5B is a front view.
FIGS. 6A and 6B are explanatory views showing a method of using the segment gripping device (third step), FIG. 6A is a side view, and FIG. 6B is a front view.
FIGS. 7A and 7B are explanatory views showing a usage method (fourth step) of the segment gripping device, in which FIG. 7A is a side view and FIG. 7B is a front view;
FIG. 8 is a side view of a segment gripping device showing a conventional example.
[Explanation of symbols]
1 Segment gripping device 2 Segment 3 Key hole 4 Key rod 5 Arm 6 Recess 7 Pin 29 Other arm 32 Balance weight

Claims (2)

In a segment gripping device that is suspended by a hoist and grips and moves a segment, a key rod that is inserted into and removed from a key hole formed in the segment, is rotated by a predetermined angle after insertion, and engages with the key hole; An arm mounted orthogonally, a pin that is provided in the arm so as to be able to protrude and retract toward the segment side, engages with a positioning recess formed in the segment when protruding, and separates from the recess when retracted, and the key rod And a shackle on which the hoist suspension hook is hung. A cylindrical body that houses the pin is provided at the tip of the arm, and the cylindrical body has a pair of shallow grooves and a pair that face each other. A deep groove is formed at intervals in the circumferential direction, and the pair of shallow grooves or a rod that selectively engages with the pair of deep grooves penetrates the pin in the diameter direction. When the rod is engaged with the shallow groove, the pin is accommodated in the state of being pulled up into the cylindrical body, and when the rod is engaged with the deep groove, the pin protrudes downward from the cylindrical body to project the segment. A segment gripping device that engages with the recess .   The segment gripping device according to claim 1, further comprising: another arm attached to the key rod at a position opposite to the arm; and a balance weight provided on the other arm.

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