JP2617663B2 - Segment retightening device for shield tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retightening device for bolts and nuts for fastening segments of a shield tunnel to each other.

[0002]

2. Description of the Related Art In a shield tunnel excavation method, an arc-shaped segment corresponding to a tunnel cross-sectional shape is sequentially assembled via bolts and nuts behind a shield excavator in accordance with the propulsion of the shield excavator, and the ground is excavated. This segment is used to separate the boundary between the two. This is a very effective construction method when constructing a tunnel under the seabed or underground in a large city where it is difficult to dig and excavate.

In this shield tunnel excavation method, adjacent segments are fastened to each other by bolts and nuts. However, since loosening of these segments occurs with time after assembly of the segments, additional tightening work for these bolts and nuts is performed. Need to do. In this case, it is necessary to construct a special scaffold for a shield tunnel with a diameter much larger than the height of the worker. In the past, it is common for workers to climb on this scaffold and perform additional tightening work. It is a target.

FIG. 7 shows a cross-sectional structure of a conventional shield tunnel when such a tightening operation is performed on a shield tunnel having a relatively large diameter, and FIG. 8 shows a cross-sectional structure taken along line VIII-VIII of the conventional shield tunnel. . That is, the segments 4 are sequentially assembled in an annular manner via the bolts 2 and the nuts 3 with the propulsion of the shield excavator (not shown) with respect to the ground 1, and the shield tunnel 5 formed by the segments 4 is arranged at predetermined intervals. The sleeper 6 is hung horizontally. Two rails 7 are laid in parallel with each other along the excavation direction of the shield tunnel 5 on the sleeper 6, and a scaffold 9 is formed on a semi-cylindrical bogie 8 that can run on these rails 7, not shown. An operator climbs the scaffold 9 and operates a nut runner or the like (not shown) to retighten the bolt 2 and the nut 3.

[0005]

When retightening the bolts 2 and the nuts 3 on the scaffold 9 formed in the shield tunnel 5 shown in FIGS. 8 and 9, the upper part of the shield tunnel 5 is located at a high place. In addition, since the diameter of the bolt 2 is relatively large, the weight of the nut runner becomes considerably heavy, which is dangerous and reduces the working efficiency.

In particular, in the case of a large-diameter shield tunnel 5, the height from the sleeper 6 to the scaffold 9 is further increased, and the diameters of the bolts 2 and the nuts 3 for fastening the segments 4 are inevitably large. As a result, the weight of the nut runner is increased, and the above-mentioned problems are further increased.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shield tunnel segment tightening device capable of safely and efficiently tightening bolts and nuts for fastening shield tunnel segments.

[0008]

According to the present invention, there is provided a segment tightening device for a shield tunnel which is movable along a shield tunnel, and which is fixed to the travel frame and extends along an inner peripheral surface of the shield tunnel. A semi-circular guide beam, a worktable rotatably supported via a horizontal base support shaft with respect to a guide carriage movable along the guide beam, and a worktable and the guide carriage A horizontal holding mechanism for holding the work table in a horizontal state, a nut runner detachably fitted to any of a bolt and a nut for fastening the shield tunnel segment, and a nut runner installed on the work table. A nut runner holding arm having the nut runner mounted on its tip and capable of arbitrarily changing the orientation of the nut runner; Wherein it is interposed between the work table and in which the nut runner holding arm equipped with an arm balancer for balancing an arbitrary posture.

[0009]

The traveling platform is moved along the shield tunnel and the guide trolley is moved along the guide beam, and the work table is positioned near the segment at the position to be retightened. At this time, regardless of the position of the guide cart with respect to the guide beam, the work table is always held in a horizontal state by the horizontal holding mechanism.

In this state, the nut runner holding arm is operated to engage the nut runner with one of the bolts and nuts to be retightened, and the nut runner is driven to retighten the bolts and nuts. In this case, regardless of the posture of the nut runner holding arm by the arm balancer, the posture in that state is maintained as it is.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and FIG.
As shown in FIG. 2 showing the cross-sectional shape in the direction of the arrow II, as shown in FIG.
The segments 14 are sequentially assembled in an annular shape via the nuts 2 and the nuts 13, and sleepers 16 are laid horizontally at predetermined intervals in a shield tunnel 15 formed by the segments 14.

On the sleeper 16 is a shield tunnel 15
The two rails 17 are laid in parallel with each other along the excavation direction, and a wheel 18 capable of rolling on the rails 17 is rotatably mounted on a traveling platform 19 on which a guide with a constant radius of curvature is provided. A semi-circular guide beam 22 having surfaces 20, 21 formed coaxially on the inner and outer circumferences is fixed.

As shown in FIGS. 1 and 2 and FIG. 3 showing an enlarged sectional structure taken along the line III in FIG. 3, and FIG. 4 showing a sectional structure taken along the line IV-IV of FIG. 2
Guide wheels 23 rotatably mounted along 0,21 are rotatably mounted and guide carts 24 which sandwich the guide beam 22 with the guide wheels 23 have guide surfaces 20,21 on side wall portions of the guide beam 22. A bogie drive motor 27 equipped with a pinion gear 26 that meshes with a sector gear 25 projecting coaxially therewith is provided.

[0014] Also, the base end portion of the base support shaft 28 projecting horizontally from the guide carriage 24 is rotatably pivotally attached to the guide carriage 24 via a bearing metal 29, the tip of the base support shaft 28 A worktable base 30 having a flat plate shape is integrally fixed. A driven gear 33 connected to the truck drive motor 27 via a speed reducer 32 installed on the guide cart 24 meshes with a driven gear 31 fitted to the tip end of the base support shaft 28. The speed reducer 32 is adjusted so that the amount of angular movement of the guide cart 24 with respect to the beam 22 corresponds to the turning angle of the base support shaft 28.
Speed reduction ratio is set.

Therefore, by setting the meshing state between the driven gear 31 and the drive gear 33 in advance so that the surface of the worktable base 30 is horizontal, the guide cart 2
Regardless of the position of the guide beam 22, the surface of the worktable base 30 can be always kept horizontal.

As shown in FIGS. 1 and 2 and FIG. 5 showing an enlarged structure of a main part thereof and FIG. 6 showing a plan view thereof, a work table base 30 is provided with a pair of laid on the work table base 30. A worktable 36 having a rotatable driving wheel 35 capable of rolling in an engaged state is mounted on the groove-shaped guide rail 34, and the worktable 3 on which a worker (not shown) rides.
A fall prevention enclosure 37 is provided around 6.

On the work table 36, a turning column 39 projecting from the lower end of the balancer body 38 is rotatably supported in a vertical state via a turning bearing 40.
The base end of a pair of front-rear movement arms 41 is attached to the lower end of 8, so that the front-rear movement arms 41 can tilt in the left-right direction in FIG. Also, a set of three vertically movable arms 4 is attached to the distal ends of the pair of longitudinally movable arms 41 via two pins 42.
One of the three base ends is pivotally connected, and both ends of the pair of vertically moving arms 43 are connected via link plates 44 and 45 to form a parallelogram link device.

A base end of a joint holder 45 projecting from the link plate 44 is integrally attached to a link plate 44 connecting the distal ends of the vertically moving arms 43. Tool holder 48 at the tip via two universal joints 46 and 47
Is installed. These two universal joints 46 and 47 have two degrees of freedom due to frictional force, respectively.
The posture of the tool holder 48 with respect to the joint holder 45 can be set arbitrarily.

The tool holder 48 includes a segment 1
A socket 49 that can be tightly fitted to the head and nut 13 of the bolt 12 mounted on the nut 4 is rotatably mounted, and an air tool 50 that can further drive the socket 49.
Is attached. These tool holder 48, socket 49 and air tool 50 constitute the nut runner of the present invention. Further, the air tool 50 of the present embodiment is connected to an air compressor (not shown) via an air pipe 51, and the operator can drive and rotate the socket 49 by operating the air tool 50. I have.

The link plate 45 connecting the base end side of the vertical movement arm 43 has a tip end of the vertical movement arm 43 that hangs downward in FIG. A counterweight (not shown) is connected via a suspension rod 52, and a balance cylinder (not shown) for urging the front-rear movement arm 41 to tilt rightward in FIG. 41. Accordingly, the tool holder 48 can be held in any posture as it is, and almost no operating force or holding force is required for the tool holder 48, and the operator can operate the tool holder 48 and the air tool 50 very easily. Can be.

It is of course possible to adopt a well-known structure other than this embodiment as the arm balancer.
An electric tool may be used instead of the air tool 50.

[0022]

According to the segment tightening device for a shield tunnel of the present invention, the work table is caused to travel along a semi-circular guide beam, and at this time, the work table is always held horizontally by the horizontal mechanism, while the nut runner is held. Is attached to the tip of the nut runner holding arm attached to this work table, and an arm balancer is interposed between the nut runner holding arm and the work table. Alternatively, it is possible to engage with the nut, so that the labor required for the retightening work can be remarkably reduced as compared with the related art, and the retightening work itself can be performed more efficiently.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an appearance of an embodiment of a segment tightening device for a shield tunnel according to the present invention.

FIG. 2 is a sectional view taken along the line II-II.

FIG. 3 is an enlarged cross-sectional view of an arrow III portion thereof.

FIG. 4 is a sectional view taken along the line IV-IV.

FIG. 5 is an enlarged view of a main part in FIG. 2;

FIG. 6 is a plan view thereof.

FIG. 7 is a conceptual diagram showing a state of construction of a scaffold used for retightening a segment in a conventional shield tunnel.

FIG. 8 is a sectional view taken along the line VIII-VIII.

[Explanation of symbols]

11 is ground, 12 is a bolt, 13 is a nut, 14 is a segment, 15 is a shield tunnel, 16 is a sleeper, 17 is a rail, 18 is a wheel, 19 is a traveling platform, 20, 21 are guide surfaces, and 22 is a guide beam. , 23 are guide wheels, 24 is a guide truck, 25 is a sector gear, 26 is a pinion gear, 27 is a truck drive motor, 28 is a base support shaft, 29 is a bearing metal, 30 is a worktable base, 31 is a driven gear, and 32 is a reducer. , 33 is a drive gear, 34 is a guide rail, 35
Is a traveling wheel, 36 is a workbench, 37 is an enclosure, 38 is a balancer body, 39 is a revolving support, 40 is a revolving bearing, 41 is a forward and backward moving arm, 42 is a pin, 43 is a vertical moving arm, and 44 and 4
5 is a link plate, 46 and 47 are universal joints, 48 is a tool holder, 49 is a socket, 50 is an air tool, 51
Is an air pipe, and 52 is a hanging rod.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiichiro Kikuta 1-1-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Inside Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Tsutomu Yasuda Hyogo-ku, Kobe-shi, Hyogo 7-14, Wadamiya-dori, Saiishi Engineering Co., Ltd.

Claims (1)

(57) [Claims] 1. A traveling platform that can move along a shield tunnel, a semi-circular guide beam fixed along the traveling platform along the inner peripheral surface of the shield tunnel, and movable along the guide beam. A worktable rotatably supported via a horizontal base support shaft with respect to a simple guide cart, and a horizontal table provided between the worktable and the guide cart to hold the worktable in a horizontal state. A holding mechanism, a nut runner that can be removably fitted to any of a bolt and a nut for fastening the shield tunnel segment, and a nut runner that is installed on the work table and is mounted at a tip end thereof and has an orientation of the nut runner. A nut runner holding arm that can be arbitrarily changed, and the nut runner holding arm is interposed between the nut runner holding arm and the work table to bring the nut runner holding arm into an arbitrary posture. Segment retightening device for shield tunnel with arm balancer to balance.