JPH05195697A - Bolt fastening device for segment - Google Patents

Abstract

PURPOSE:To improve work efficiency and safety by providing a press plate on at least one of a nut runner and a nut holder movable nearby or apart and faced to bolt box holes of face segments arranged adjacently respectively. CONSTITUTION:A fastening device 11 fastening an existing segment SA and a segment S is constituted of a nut holder 20 coupling and holding a nut 19 screwed to one end of a bolt 18 in advance and a nut runner 22 screwing a nut 21 to the other end. A press plate 28 is arranged at the rear section of the nut holder 20. The nut runner 22 and the nut holder 20 are positioned above bolt box holes 14, 14, and the nut runner 22 and the press plate 28 are lowered into the box hole 14. The bolt 18 stored in one hole 14 is thrust into the other hole 14. One end of the bolt 18 is attracted and held by the magnet of the press plate 28 at this time. The fastening work is made completely automatic, and the work efficiency and safety can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt fastening device for a tunnel segment in a shield excavation method.

[0002]

2. Description of the Related Art Generally, a shield excavation method is used to construct a tunnel. This construction method excavates the tunnel face while propelling the shield machine with the rear jack thrust, and along with the propulsion, assembles the segments by bolting the segments at the rear part of the shield machine to complete the lining. .

Then, in order to streamline the bolt fastening work of the segment, a bolt fastening device of the segment has been proposed. In general, this bolt fastening device has a nut runner and a nut holder that face the respective bolt box holes of the two adjacently arranged segments and can approach and separate from each other.

[0004]

By the way, in recent years,
Form a bolt box hole at a position that is inside the connecting surface of both connected segments by a required distance, insert the bolt into the bolt hole opened between this bolt box hole and the connecting surface, and use both ends with nuts. Many of the tightened segments have been adopted.

In this case, since the bolt for connection becomes long, it becomes difficult to insert the bolt after the segment is arranged. This is because the bolt box hole cannot be made too large due to the strength of the segment. For this reason, a method is adopted in which the bolt is stored in advance in one of the bolt box hole sides of the segments to be connected.

However, in the conventional bolt fastening device, the bolt cannot be fastened while the bolt is accommodated in one of the bolt box holes, so that the worker is accommodated in the one of the bolt box holes. Need to be pushed toward the other bolt box hole side so that both ends project into both bolt box holes, which is a problem in terms of work efficiency and safety.

Therefore, an object of the present invention is to automatically and mechanically move the bolts accommodated in one bolt box hole side to the other bolt box hole side, thereby improving work efficiency and safety. To provide a bolt fastening device for a segment.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bolt fastening device having a nut runner and a nut holder that face each other in the bolt box holes of both adjacently arranged segments and can approach and separate from each other. In the above, at least one of the nut runner and the nut holder is provided with a push plate that pushes a bolt previously accommodated in one bolt box hole side to the other bolt box hole side.

[0009]

When the bolt is fastened, the push plate provided on at least one of the nut runner and the nut holder is moved by the movement, and the bolt accommodated in one bolt box hole side is moved by the push plate to the other bolt. It is pushed to the side of the box hole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a cylindrical shield frame of a shield machine, inside which an assembly device 2 for a segment S is provided. This segment assembly device 2
Is a slewing wheel 3 rotatably supported on the inner circumference of the shield frame 1, and a pair of arms 4 projecting from the end surface of the slewing wheel 3 and is movable in the radial direction via a guide rod 5 and a hydraulic cylinder. The suspension beam 6 is provided mainly on the suspension beam 6, and the segment grip portion 8 is provided on the suspension beam 6 via the attitude adjusting mechanism 7.

As shown in FIG. 2, the segment grip portion 8 includes a grip fitting 9 that engages with the engagement hole of the segment S to grip the segment S, and a bolt fastening device that fastens the segment S and the existing segment by bolts. Is equipped with. This bolt fastening device is mainly composed of a bolt fastening device 10 for fastening segments adjacent to each other in the tunnel axial direction and a bolt fastening device 11 for fastening segments adjacent to each other in the tunnel circumferential direction. Next, the bolt fastening device 11 in the tunnel circumferential direction will be described in detail.

As shown in FIG. 5, the segment S is formed into a circular arc shape by using reinforced concrete or the like, and a plurality of bolt box holes 14 are formed on the inner surface of the connecting surface 12, 13 so as to be located inside by a required distance. Bolt holes 15 and 16 are formed between the bolt box hole 14 and the connecting surfaces 12 and 13. In the segment S of the illustrated example, three bolt holes 16 are formed in the circumferential coupling surface 13 as one set. Further, the gripping metal 9 is provided at the center of the inner surface of the segment S.
Are formed with engaging holes 17.

As shown in FIG. 3, the bolt fastening device 11 has a nut holder 20 for engaging and holding a nut 19 screwed in advance on one end of a bolt 18, and a nut 21 for screwing the other end of the bolt 18. It is mainly composed of a nut runner 22. The nut holder 20 has an engaging portion 23 corresponding to the nut 19, and an upper end portion is attached to a support arm 25 so as to be able to move up and down via a guide shaft (not shown) and a screw shaft 24 which is an elevating mechanism. The upper end of the support arm 25 is slidably attached to the lower portion of the frame body 26 of the segment gripping portion 8 in the bolt axial direction via a guide rail 27 and a feeding device (not shown).

As shown by the phantom line in the figure, the bolt 18 is housed in the one bolt box hole 14 side in advance so as not to project from the connecting surface 13 of the segment S. Therefore, when the bolt is fastened, the nut 18 is attached to the nut runner. It is necessary to push it to the 22 side. Therefore, a push plate 28 for contacting the end portion of the bolt 18 and pushing it forward is arranged at the rear portion of the nut holder 20, and the upper end portion of the push plate 28 is formed by a guide and a lifting mechanism (not shown). It is attached to the support arm 25 via a screw shaft 29 so as to be able to move up and down.

As shown in FIG. 4, the lower end of the push plate 28 is provided with three inverted U-shaped notches 30 that engage with the ends of the three bolts 18 from above. The peripheral portion 31 contacts the end surface of the nut 19. Further, a magnet 32 for attracting the nut 19 is attached near the peripheral portion 31.

The nut runner 22 has a rotating portion 33 to which the nut 21 to be screwed to the bolt 18 is previously attached, and these rotating portions 33 are rotationally driven by a motor 34 and a gear mechanism (not shown). . The nut runner 22 is attached to the elevating frame 35 slidably in the bolt axial direction via a guide rod 36 and a hydraulic cylinder (not shown). The elevating frame 35 is attached to a fixed frame 37 fixed to the lower part of the frame body 26 so as to be able to ascend and descend via a guide (not shown). A hydraulic cylinder 40 for rolling is attached, and a rack 41 that meshes with the pinion 39 is attached to the elevating frame 35.

Next, the operation of the embodiment will be described. When the segment gripping portion 8 grips the segment S by the gripping metal 9, the suspension beam 6 is moved and the turning wheel 3 is turned to convey the segment S to a predetermined position on the end face of the existing segment SA, and the existing segment SA and the segment S are moved. The bolts are fastened by the bolt fastening devices 10 and 11. In this case, first, as shown in FIG. 6A, the nut runner 22 and the nut holder 20 are positioned above the corresponding bolt box holes 14 and 14, and then, as shown in FIG. 6B, the nut runner 22 and the push plate. 28 are lowered into the bolt box holes 14, 14, respectively.

Then, the nut runner 22 and the push plate 28 are moved closer to each other as shown in FIG. 3C, so that the bolt 18 accommodated in one bolt box hole 14 side is moved to the other bolt box hole 14 side. Push to. In this case, one end of the bolt 18 is attracted and held by the magnet 32 of the push plate 28 via the nut 19, so that the bolt 18 can be smoothly inserted into the bolt hole 16 without wobbling.

Then, as shown in (d) of FIG.
To move the nut holder 20 backward so that it is positioned on the bolt box hole 14 and then lower it into the bolt box hole 14, and then move the nut holder 20 forward as shown in FIG. The portion 23 is engaged with the nut 19, and the nut runner 22 is driven to screw the nut 21 previously mounted on the rotating portion 33 to the other end of the bolt 18 for tightening. After the bolts are fastened in this manner, the nut runner 22 and the nut holder 20 are separated from each other as shown in (f) of the figure, and then the nut runner 22 and the nut holder 20 are put into the bolt box holes 14 and 14 as shown in (g) of the figure. You can raise it from within.

In the above embodiment, the case where the push plate 28 is provided on the nut holder 20 side has been described, but it may be provided on the nut runner 22 side, or may be provided on both the nut holder 20 and the nut runner 22. You can

[0022]

In summary, according to the present invention, at least one of the nut runner and the nut holder is provided with a push plate for moving the bolt accommodated in one bolt box hole side to the other bolt box hole side by its movement. Therefore, the bolt fastening work can be fully automated, and work efficiency and safety can be improved.

[Brief description of drawings]

FIG. 1 is a rear view of a shield machine showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a view showing details of a bolt fastening device.

FIG. 4 is a view showing a push plate.

FIG. 5 is a perspective view of a segment.

FIG. 6 is a view for explaining the operation of the bolt fastening device.

[Explanation of symbols]

 14 Bolt box hole 18 Bolt 20 Nut holder 22 Nut runner 28 Push plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichiro Kuwahara 13 Showa-cho, Minato-ku, Nagoya, Aichi Ishikawajima Harima Heavy Industries Co., Ltd. Nagoya factory

Claims (1)

[Claims] 1. A bolt fastening device having a nut runner and a nut holder facing the respective bolt box holes of both adjacently arranged segments and capable of approaching and separating from each other, wherein at least one of the nut runner and the nut holder has one of A bolt fastening device for a segment, comprising a push plate for pushing a bolt accommodated in the bolt box hole side to the other bolt box hole side.