Work device for tunnel construction

Abstract

To prevent a work loss generated by occurrence of a lateral displacement of a supporting due to traveling of an erector truck in erection of the supporting or vibration in work.SOLUTION: A holding part is provided at a supporting catcher, and the holding part has a pair of holding claws that sandwich both side edges of a supporting lower flange from outside by changing an interval using driving of a hydraulic cylinder. The pair of holding claws have parts opposed to the supporting. The parts opposed to the supporting have plane parts formed such that a gap therebetween at the parts of the pair of holding claws opposed to the supporting becomes the same gap toward an upper end side from a lower end side, end surfaces formed such that a gap therebetween becomes narrower toward the upper end side from the lower end side, and grinding parts formed such that a gap therebetween becomes narrower from the lower end side to a bending surface and the gap therebetween becomes larger toward a back side from the bending surface.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a working device for tunnel construction. [Background technology]

[0002] Generally, in tunnel construction using the New Alpine Tunneling Method (NATM), well-known tunnel construction work equipment such as that shown in Patent Document 1 is used for erecting shoring, ancillary work such as installing wire mesh, and spraying concrete.

[0003] Therefore, this tunnel construction work equipment is equipped with an erector mechanism, a basket mechanism and a spraying mechanism; the erector mechanism is used for transporting and setting up the shoring work, the spraying mechanism is used for spraying concrete at the ground stage and after the shoring work is completed and the wire mesh is installed, and the basket mechanism is used as a work scaffold for workers performing ancillary work such as setting up the wire mesh.

[0004] The erector mechanism is composed of an erector boom attached to the left and right ends of the trolley body, an erector arm attached to each end, and a support catcher equipped with a pair of gripping claws attached to each end.

[0005] The swinging and telescopic functions of this erector boom, the shape change caused by the bending of the erector arm, and the swinging function of the support catcher allow the support catcher to point in the desired direction, making it possible to change its position while still holding the shoring, making it possible to carry out everything from transporting the shoring to erecting it using only the tunnel construction work equipment.

[0006] Incidentally, with regard to the pair of gripping claws provided on this shoring catcher, currently, in order to be able to grip shoring of various sizes with a single gripping claw and to prevent the shoring from falling off, it is common for the portions of the pair of gripping claws 701, 702 that face shoring 101 (H dimension 250 mm) or shoring 102 (H dimension 125 mm) to have a narrow gap between them partway from the base end toward the tip end, as shown in Figures 8(A) and 8(B), and for the gripping claws to be shaped so that the inclination angles of the opposing portions are the same. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP2009-299421A Summary of the Invention [Problem to be solved by the invention]

[0008] However, with this gripping claw shape, when the shoring is gripped, as shown in Figures 9(A) and 9(B), the contact area between the gripping claws 701, 702 and both side edges of the lower flange of the shoring 102 does not come into contact with each other, resulting in a small contact area.As a result, although the shoring will not fall off due to vibrations during travel or work, it may shift sideways, resulting in work loss.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a work device for tunnel construction that increases the contact area between the gripping claws and the support, thereby preventing lateral slippage, without compromising the conventional gripping function. [Means for solving the problem]

[0010] An erector boom is attached to the tip of the trolley body of the tunnel construction work device, and a shoring catcher is attached to the tip of the erector boom via an erector arm. The shoring catcher has a gripping portion that grips the shoring made of H-shaped steel, and the gripping portion has a pair of gripping claws that clamp both side edges of the lower flange of the shoring from the outside by changing the spacing by driving a hydraulic cylinder. The pair of gripping claws have a portion that faces the shoring, and the portion that faces the shoring has a flat portion formed so that the gap between the parts of the pair of gripping claws that face the shoring is the same from the lower end side to the upper end side, an end face formed so that the gap between them narrows from the lower end side to the upper end side, and a grinding portion formed so that the gap between them narrows from the lower end side to the curved surface and widens from the curved surface to the back side. Effect of the Invention

[0011] According to the present invention, it is possible to prevent the grasped shoring from shifting sideways due to vibrations during transportation and erection of the shoring, thereby eliminating the work loss caused by redoing the gripping. [Brief description of the drawings]

[0012] [Figure 1] 1A and 1B are diagrams showing an erector truck equipped with a tunnel construction work device in an embodiment of the present invention, where (A) is a front view and (B) is a plan view of the same. [Diagram 2] 2A and 2B are diagrams showing the main parts of an embodiment of the present invention, in which (A) is a plan view, (B) is a view taken along the line 2-2 in FIG. 2A, and (C) is a view taken along the line 1-1 in FIG. 2A. [Diagram 3] 2A to 2D are diagrams showing the shape of the gripping jaws in an embodiment of the present invention, where (A) is an arrow view taken along line 1-1 in FIG. 2A, (B) is an arrow view taken along line 2-2 in FIG. 2A, (C) is an arrow view taken along line 3-3 in FIG. 2A, and (D) is an arrow view taken along line 4-4 in FIG. [Figure 4] (A) is an arrow view of 1-1 in [Figure 2] (A), (B) is an arrow view of 2-2, (C) is an arrow view of 3-3, and (D) is an arrow view of 4-4. [Diagram 5](A) is an arrow view of 1-1 in [Figure 2] (A), (B) is an arrow view of 2-2, (C) is an arrow view of 3-3, and (D) is an arrow view of 4-4. [Figure 6] (A) is an arrow view of 1-1 in [Figure 2] (A), (B) is an arrow view of 2-2, (C) is an arrow view of 3-3, and (D) is an arrow view of 4-4. [Figure 7] 1A and 1B are diagrams showing the state in which a shoring is gripped in an embodiment of the present invention, where (A) is a diagram showing the flat surface of the gripping claw on the telescopic piece, (B) is a diagram showing the flat surface of the gripping claw on the drive unit, (C) is a diagram showing the state in which a shoring with a H dimension of 250 mm is gripped, and (D) is a diagram showing the state in which a shoring with a H dimension of 125 mm is gripped. [Figure 8] 1A and 1B are diagrams showing a gripping part of the prior art, where FIG. 1A shows a case where a support with a height of 250 mm is gripped, and FIG. 1B shows a case where a support with a height of 125 mm is gripped. [Figure 9] These are diagrams showing the state in which a shoring is gripped using conventional technology, where (A) shows the contact state of the gripping claws on the telescopic piece with the shoring, and (B) shows the contact state of the gripping claws on the drive unit with the shoring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] BEST MODE FOR CARRYING OUT THE PRESENT DISCLOSURE A tunnel construction work device according to an embodiment of the present invention will be described below with reference to Figs. 1 to 7. Figs.

[0014] A tunnel construction work device according to an embodiment of the present invention is mounted on an erector truck 10 shown in Figures 1(A) and (B).

[0015] Reference numeral 11 denotes the carriage body, and a total of five booms are attached to the tip of the carriage body 11: a robot boom 20, basket booms 30, 130, and erector booms 50, 150. Each of the five booms has a telescopic structure, and can be extended and retracted in multiple stages by the extension and retraction action of a hydraulic cylinder (not shown) installed in each stage.

[0016] In addition, the five telescopic booms can be swung up and down and left and right and rotated around an axis, with each boom at its base end as a fulcrum, by a hydraulic cylinder (not shown) provided for each direction.

[0017] Of the five telescopic booms, a robot arm 22 is attached to the tip of the robot boom 20, and a spray nozzle 21 is attached to the tip of the robot arm 22. By the telescopic movement and swinging movement in each direction of the robot boom 20 and the swinging movement of the robot arm 22 in each direction, the spray nozzle 21 can be moved to a specified position and pointed in a specified direction to spray concrete.

[0018] Next, a basket 40 is provided at the tip of the basket boom 30, and a basket 140 is provided at the tip of the basket boom 130. By extending and retracting the basket booms 30, 130 and swinging in each direction, the baskets 40, 140 in which the worker sits can be moved to a designated position, allowing the worker to perform ancillary tasks such as installing wire mesh.

[0019] Next, a shoring catcher 60 is attached to the tip of the erector boom 50 via an erector arm 70, and a shoring catcher 160 is attached to the tip of the erector boom 150 via an erector arm 170, each of which can grasp the shoring 100 made of H-shaped steel beams and transport and erect it.

[0020] Next, since the erector booms 50, 150 are symmetrical from the base end to the tip end, below, we will explain the embodiment only of the device configuration of the erector boom 50 attached to the left side facing the direction of travel of the erector cart 10 in Figure 1 (B) (left side of the drawing).

[0021] As shown in Figures 2(A), 2(B), and 2(C), erector arm 70 is L-shaped. Hydraulic cylinders 73, 74, and 75 are provided between erector boom 50 and erector arm 70 and in erector arm 70 itself, and these hydraulic cylinders can change the inclination of erector arm 70 itself and the inclination between each side that constitutes erector arm 70.

[0022] Reference numeral 71 denotes the gripping portion, and the base end portion of the gripping portion 71 constitutes the driving portion 701 having a built-in hydraulic cylinder 701A. The driving portion 701 is equipped with an extendable piece 702 that extends from within the driving portion 701 by extension and contraction action, and is connected to the extendable piece 702 by the hydraulic cylinder 701A.

[0023] In addition, a gripping claw 61 is attached to the expandable piece 702, and a gripping claw 62 is attached to the drive unit 701, forming a pair of gripping claws. When the hydraulic cylinder 701A is driven, the distance between the gripping claws 61 and 62 changes, making it possible to grip both side edges of the lower flange of the support from the outside.

[0024] Next, 72 is the gripping part, and the base end portion of the gripping part 72 constitutes a driving part 703 having a built-in hydraulic cylinder (not shown). The driving part 703 is equipped with an extension piece 704 that extends from within the driving part 703 by extension and contraction action, and is connected to the extension piece 704 by a hydraulic cylinder (not shown).

[0025] In addition, a gripping claw 63 is attached to the expandable piece 704, and a gripping claw 64 is attached to the drive unit 703, forming a pair of gripping claws.When a hydraulic cylinder (not shown) is driven, the distance between the gripping claws 63 and 64 changes, allowing both side edges of the lower flange of the support to be gripped from the outside.

[0026] As described above, one side of the support 100 is gripped by the pair of gripping claws 61, 62 of the gripping portion 71, and the other side of the support 100 is gripped by the pair of gripping claws 63, 64 of the gripping portion 72.

[0027] Furthermore, gripping jaws 61, 62, 63, and 64 are made of steel and formed by end milling. The shapes will be explained below with reference to Figures 3 to 6. Note that the dotted lines in the drawings are auxiliary lines to indicate dimensions and angles, with the vertical dotted lines being perpendicular to the bottom surface of each gripping jaw, the horizontal dotted lines being horizontal to the bottom surface of each gripping jaw, the diagonal dotted lines being extensions of each side, and the dotted lines of the arcs indicating angles.

[0028] First, as shown in Figure 3(A), gripping claw 61 has ground portion 61A, end face 61B, end face 61C, end face 61D, as shown in Figure 3(B), chamfered portion 61E, side face 61F, as shown in Figure 3(C), back face 61G, back face 61H, as shown in Figure 3(C), and chamfered portion 61I, side face 61J, a top face (not shown), and a bottom face (not shown) as shown in Figure 3(D).

[0029] In addition, the width dimension W of the gripping jaws 61 is 150 mm, the height dimension H is 85 mm, the depth dimension D is 71 mm, the dimension L11 is 29 mm, the dimension L12 is 42 mm, the dimension L13 is 60 mm, the dimension L14 is 40 mm, the dimension L15 is 10 mm, the dimension L16 is 5 mm, the dimension L17 is 20.5 mm, the angle A11 is 70° centered on point 164, the angle A12 is 80° centered on point 166, the angle A13 is 30° centered on vertex 135, and the angle A14 is 35° centered on vertex 102.

[0030] First, as shown in Fig. 3(A), ground portion 61A is surrounded by sides 101, 103, 104, 127, 119, and 123. Ground portion 61A is also composed of flat surface 601A, curved surface 601B, and flat surface 601C. Flat surface 601A is inclined at angle A14 in Fig. 3(D), and flat surface 601C is inclined at angle A12.

[0031] Next, end face 61B is surrounded by sides 127, 109, 128, and 118. End face 61B is inclined at angle A13, as shown in FIG.

[0032] Next, end face 61C is surrounded by sides 128, 111, and 115. In addition, end face 61C is perpendicular to the bottom surface of gripping jaw 61 (not shown).

[0033] Next, end face 61D is surrounded by sides 115, 113, 114, and 116, and end face 61D is inclined as shown in Figures 3(B) and (D). This forms a recess between end face 61D and the bottom surface of gripping jaw 61 (not shown).

[0034] Next, as shown in FIG. 3B, the chamfered portion 61E is surrounded by sides 129, 123, 146, and 145.

[0035] Next, side 61F is bounded by sides 146, 119, 116, 138, 140, and 142. Side 119 is also curved at vertex 120.

[0036] 3C, the rear surface 61G is surrounded by sides 147, 145, 142, 156, 160, and 162. The rear surface 61H is surrounded by sides 156, 140, 155, and 158.

[0037] Next, as shown in FIG. 3(D), the chamfered portion 611 is surrounded by sides 163, 162, 168, and 103.

[0038] Next, side surface 61J is surrounded by sides 168, 160, 158, 165, 113, 111, and 109. Side 109 is bent at vertex 105.

[0039] Next, gripping claw 62 has ground portion 62A, end face 62B, end face 62C, end face 62D as shown in Figure 4(C), chamfered portion 62E, side face 62F as shown in Figure 4(D), back face 62G, back face 62H as shown in Figure 4(A), and chamfered portion 62I, side face 62J, a top face (not shown), and a bottom face (not shown) as shown in Figure 4(B).

[0040] In addition, the width dimension W of the gripping jaws 62 is 150 mm, the height dimension H is 95 mm, the depth dimension D is 73 mm, the dimension L21 is 29 mm, the dimension L22 is 41 mm, the dimension L23 is 60 mm, the dimension L24 is 50 mm, the dimension L25 is 20 mm, the dimension L26 is 15 mm, the dimension L27 is 20.5 mm, the angle A21 is 70° centered on point 268, the angle A22 is 80° centered on point 266, the angle A23 is 30° centered on vertex 267, and the angle A24 is 35° centered on vertex 266.

[0041] First, as shown in Fig. 4(C), the ground portion 62A is surrounded by sides 238, 240, 242, 267, 262, and 264. The ground portion 62A is also composed of a flat surface 602A, a curved surface 602B, and a flat surface 602C. The flat surface 602A is inclined at an angle A24 in Fig. 4(D), and the flat surface 602C is inclined at an angle A22.

[0042] Next, the end face 62B is surrounded by sides 267, 246, 268, and 259. The end face 62B is inclined at an angle A23, as shown in FIG.

[0043] Next, end face 62C is surrounded by sides 268, 248, 253, and 257. Further, end face 62C is perpendicular to the bottom surface of gripping jaw 62 (not shown).

[0044] Next, end face 62D is surrounded by sides 253, 250, 252, and 255, and end face 62D is inclined as shown in Figures 4(B) and (D). This forms a recess between end face 62D and the bottom surface of gripping jaw 62 (not shown).

[0045] Next, as shown in FIG. 4(D), the chamfered portion 62E is surrounded by sides 265, 264, 271, and 272.

[0046] Next, side 62F is bounded by edges 271, 262, 257, 255, 273, 207, and 205. Edge 262 is also bent at vertex 274.

[0047] 4A, the back surface 62G is surrounded by sides 201, 203, 205, 210, 214, and 216. The back surface 62H is surrounded by sides 210, 207, 209, and 212.

[0048] Next, as shown in FIG. 4B, the chamfered portion 62I is surrounded by sides 218, 216, 236, and 240.

[0049] Next, side surface 62J is bounded by sides 236, 214, 212, 225, 250, 248, 246, and 242. Side 242 is also bent at vertex 234.

[0050] In the above embodiment, end faces 61C and 62C of the pair of gripping claws 61 and 62, which are portions facing the support, are perpendicular to the bases of the gripping claws 61 and 62, respectively.

[0051] Similarly, end faces 61B and 62B, which are the portions facing the support, are each shaped to incline toward the support (not shown) from the lower end side to the upper end side.

[0052] Similarly, grinding portions 61A and 62A, which are portions facing the support (not shown), are inclined toward the support (not shown) from the lower end side to the upper end side at an angle of 80°. A flat surface 601A and a curved surface 601B are formed at the tip of grinding portion 61A, and a flat surface 602A, a curved surface 602B, and a relief portion are formed at the tip of grinding portion 62A.

[0053] Next, as shown in Figure 5(A), gripping claw 63 has ground portion 63A, end face 63B, end face 63C, end face 63D, as shown in Figure 5(B), chamfered portion 63E, side face 63F, as shown in Figure 5(C), back face 63G, back face 63H, as shown in Figure 5(C), and chamfered portion 63I, side face 63J, a top face (not shown), and a bottom face (not shown) as shown in Figure 5(D).

[0054] In addition, the width dimension W of the gripping jaws 63 is 150 mm, the height dimension H is 85 mm, the depth dimension D is 71 mm, the dimension L31 is 29 mm, the dimension L32 is 42 mm, the dimension L33 is 60 mm, the dimension L34 is 40 mm, the dimension L35 is 10 mm, the dimension L36 is 5 mm, the dimension L37 is 20.5 mm, the angle A31 is 70° centered on point 345, the angle A32 is 80° centered on point 342, the angle A33 is 30° centered on vertex 338, and the angle A34 is 35° centered on vertex 335.

[0055] First, as shown in Fig. 5(A), ground portion 63A is surrounded by sides 301, 303, 307, 329, 324, and 326. Ground portion 63A is also composed of flat surface 603A, curved surface 603B, and flat surface 603C. Flat surface 603A is inclined at angle A34 in Fig. 5(B), and flat surface 603C is inclined at angle A32.

[0056] Next, end face 63B is surrounded by sides 329, 309, 330, and 320. End face 63B is inclined at angle A33 as shown in FIG.

[0057] Next, end face 63C is surrounded by sides 330, 314, and 318. In addition, end face 63C is perpendicular to the bottom surface (not shown) of gripping jaw 63.

[0058] Next, end face 63D is surrounded by sides 314, 311, 313, and 316, and end face 63D is inclined as shown in Figures 5(B) and (D). This forms a recess between end face 63D and the bottom surface of gripping jaw 63 (not shown).

[0059] Next, as shown in FIG. 5(B), the chamfered portion 63E is surrounded by 331, 326, 351, and 336.

[0060] Next, side surface 63F is surrounded by sides 351, 324, 320, 318, 316, 344, 345, and 348. Side 324 is also curved at vertex 302.

[0061] 5C, the back surface 63G is surrounded by the sides 352, 336, 348, 360, 364, and 366. The back surface 63H is surrounded by the sides 360, 345, 359, and 362.

[0062] Next, as shown in FIG. 5(D), the chamfered portion 63I is surrounded by sides 371, 366, 349, and 352.

[0063] Next, side surface 63J is surrounded by sides 349, 364, 362, 377, 311, and 307. Side 307 is curved at vertex 365.

[0064] Next, the gripping claw 64 has a ground portion 64A, end face 64B, end face 64C, end face 64D as shown in Figure 6(C), a chamfered portion 64E, side face 64F as shown in Figure 6(D), a back face 64G, back face 64H as shown in Figure 6(A), and a chamfered portion 64I, side face 64J, a top face (not shown), and a bottom face (not shown) as shown in Figure 6(B).

[0065] In addition, the width dimension W of the gripping jaws 64 is 150 mm, the height dimension H is 95 mm, the depth dimension D is 73 mm, the dimension L41 is 29 mm, the dimension L42 is 41 mm, the dimension L43 is 60 mm, the dimension L44 is 50 mm, the dimension L45 is 10 mm, the dimension L46 is 15 mm, the dimension L47 is 20.5 mm, the angle A41 is 70° centered on point 424, the angle A42 is 80° centered on point 427, the angle A43 is 30° centered on vertex 432, and the angle A44 is 35° centered on vertex 440.

[0066] First, as shown in Fig. 6(C), ground portion 64A is surrounded by side 442, sides 439, 438, 436, 463, and 465. Ground portion 64A is also composed of flat surface 604A, curved surface 604B, and flat surface 604C. Flat surface 604A is inclined at angle A44 in Fig. 6(B), and flat surface 604C is inclined at angle A42.

[0067] Next, end face 64B is surrounded by sides 436, 447, 469, and 459. End face 64B is inclined at angle A43, as shown in FIG.

[0068] Next, the end surface 64C is surrounded by the sides 469, 431, 454, and 457. Further, the end surface 64C is perpendicular to the bottom surface (not shown) of the gripping jaw 64.

[0069] Next, the end face 64D is surrounded by the sides 454, 426, 453, and 456, and the end face 64D is inclined as shown in Figures 6(B) and 6(D). This forms a recess between the end face 64D and the bottom surface (not shown) of the gripping jaw 64.

[0070] Next, as shown in FIG. 6(D), the chamfered portion 64E is surrounded by sides 471, 465, 475, and 402.

[0071] Next, side 64F is bounded by edges 475, 463, 459, 457, 456, 473, 407, and 405. Edge 463 is also curved at vertex 455.

[0072] 6A, the back surface 64G is surrounded by sides 401, 402, 405, 410, 414, and 416. The back surface 64H is surrounded by sides 410, 407, 409, and 412.

[0073] Next, as shown in FIG. 6B, the chamfered portion 64I is surrounded by sides 418, 416, 441, and 439.

[0074] Next, side 64J is bounded by sides 441, 414, 412, 425, 426, 431, and 438. Side 438 is also curved at vertex 437.

[0075] In the above embodiment, the end faces 63C and 64C of the pair of gripping claws 63 and 64, which are portions facing the support, are perpendicular to the bases of the gripping claws 63 and 64, respectively.

[0076] Similarly, end faces 63B and 64B, which are the parts facing the support, are each slanted toward the support from the lower end to the upper end.

[0077] Similarly, grinding portions 63A and 64A, which are portions facing the support, are inclined toward the support from the lower end to the upper end at an angle of 80°. At the tip of grinding portion 63A, flat surface 603A and curved surface 603B, and at the tip of grinding portion 64A, flat surface 604A and curved surface 604B, each form a relief portion.

[0078] The above is the shape of the gripping claws, but in this embodiment, gripping claw 61 is attached to expandable piece 702, and gripping claw 62 is attached to the drive unit by welding. As shown in Fig. 7, weld metal 35 generated by welding enters the depression between the end face and the bottom face, but gripping claw 61 makes end face 61C and welded metal 35, and gripping claw 62 makes end face 62C and welded metal 35, the same plane. Grip claws 63 and 64 are attached in the same way.

[0079] Next, the operation of the tunnel construction work device having the above-mentioned configuration in this embodiment will be described. Note that since the gripping portion 71 and the gripping portion 72 are the same embodiment, only the gripping portion 71 will be described.

[0080] Figures 7(A) and (B) show the state in which the support 100 is gripped by the gripping claws 61 and 62 that constitute the gripping portion 71. Each of these pair of gripping claws 61, 62 has a portion facing the support 100 and a back portion opposite the top portion.

[0081] First, as the portions facing the shoring 100, the flat portions 611, 622, which are composed of the end faces 61C, 62C and the weld metal 35 that have been flattened to the same plane, are formed so that the gaps between them are the same from the lower end side to the upper end side due to the vertical posture of the end faces 61C, 62C. Therefore, when the shoring 100 is gripped, the flat portions 611, 622 come into surface-to-surface contact with the flat portions of the opposite side edges of the lower flange of the shoring 100.

[0082] On the other hand, when the gripping claws 61, 62 are attached by a method other than welding, it is possible to eliminate the need for inclined end faces 61D, 62D, and make the end faces 61C, 62C long enough to reach the bottom surface, with only the end faces 61C, 62C being flat surfaces perpendicular to the bottom surface.

[0083] Also, due to the shape and arrangement of the gripping claws, the end faces 61C, 62C are shaped so that the height dimension gradually increases toward the center line (not shown) in the forward / rearward direction of travel of the carriage body 11. As a result, the height dimension of the flat portion 611, including the steps of the drive portion 701 and the extendable portion 702, is about 20 mm to 50 mm, and the height dimension of the flat portion 622 is also 20 mm to 50 mm.

[0084] 7(C), both side edges of bottom flange 101A of R-shaped support 101 with a height of 250 mm can be held against flat portions 611 and 622. Also, as shown in FIG. 7(D), both side edges of bottom flange 102A of R-shaped support 102 with a height of 125 mm can be held against flat portions 611 and 622.

[0085] Next, as the parts facing the support 100, end faces 61B, 62B (not shown) are positioned so as to incline from the upper end side of the vertical portion end faces 61C, 62C toward the support 100 side, and the gap between them is formed so that the spacing narrows from the lower end side to the upper end side.

[0086] Next, as the portion facing the support 100, the grinding portions 61A, 62A are formed so that the gap between the flat surfaces 601C, 602C narrows from the lower end toward the upper end, and the gap between the flat surfaces 601A, 602A widens toward the tip side via the curved surfaces 601B, 602B, respectively.

[0087] The end faces 61B, 62B (not shown) and ground portions 61A, 62B described above make it easier to grip the support 100, and also makes it less likely to fall off even if it becomes loose due to a malfunction of the hydraulic device or the like. [Explanation of symbols]

[0088] 10 Erector dolly 11 Cart body 50, 150 Erector Boom 70, 170 Shoring catcher 71 Gripping part 72 Gripping part 61 Gripping claw 62 Gripping claw 63 Gripping claw 64 Gripping claw

Claims

[Claim 1] A tunnel construction work device comprising: an erector boom attached to the tip of the trolley body; a shoring catcher attached to the tip of the erector boom via an erector arm; the shoring catcher having a gripping portion for gripping a shoring made of H-shaped steel; the gripping portion having a pair of gripping claws that clamp both side edges of the lower flange of the shoring from the outside by changing the spacing by driving a hydraulic cylinder; the pair of gripping claws having a portion that faces the shoring; and the portion that faces the shoring having a flat portion formed so that the gap between the portions of the pair of gripping claws that face the shoring is the same from the lower end side to the upper end side, an end face formed so that the gap between them narrows from the lower end side to the upper end side, and a grinding portion formed so that the gap between them narrows from the lower end side to the curved surface and widens from the curved surface to the back side.

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