JPH06117198A - Additionally tightening apparatus for segment of shield tunnel - Google Patents

Abstract

PURPOSE:To improve working efficiency, by a method wherein a working platform on which a nut-runner is provided is placed, movably in the horizontal state thereof, on a semicircular arc-shaped guide beam traveling in a tunnel, and segments are additionally tightened with fasteners by moving the working platform along the inner surface of the tunnel. CONSTITUTION:A working platform 36 is placed, movably in the condition that the level thereof is held, on a semicircular arc-shaped guide beam 22 mounted on a frame 19 traveling on rails 17, through a guiding platform car 24. A nut-runner composed of an arm 43 having a balancer and so on and hand rails 37 are provided on the working platform 36. While the working platform 36 is being moved, bolts 12 and nuts 13 for connecting segments 14 placed on the inner wall of a tunnel 15 are additionally tightened with the nut-runner. In this way, the work of additionally tightening them can be done efficiently.

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 the shield tunnel excavation method, arc-shaped segments corresponding to the tunnel cross-sectional shape are sequentially assembled behind the shield excavator through bolts and nuts as the shield excavator is propelled. The boundary of the is divided by this segment, and it is an extremely effective construction method when constructing a tunnel under the seabed or underground of a big city where the excavation method is difficult.

In this shield tunnel excavation method, adjacent segments are fastened to each other by bolts and nuts, but since loosening of these segments occurs with time after the segments are assembled, the bolts and nuts are tightened. Need to do. In this case, it is necessary to build a special scaffold for a shield tunnel with a diameter much larger than the worker's height, and in the past it was common for workers to climb this scaffold and perform tightening work. Target.

FIG. 7 shows a cross-sectional structure of a conventional shield tunnel when such a retightening operation is performed on a shield tunnel having a relatively large diameter, and FIG. 8 shows a cross-sectional structure taken along the line VIII-VIII. . That is, as the shield excavator (not shown) is propelled against the natural ground 1, the segments 4 are sequentially assembled in an annular shape through the bolts 2 and the nuts 3, and the shield tunnel 5 formed by the segments 4 is spaced at predetermined intervals. The sleeper 6 is hung horizontally. Two rails 7 are laid parallel to 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 dolly 8 that can run on these rails 7 and is not shown. An operator climbs the scaffold 9 and operates a nut runner or the like (not shown) to perform the tightening work of the bolt 2 and the nut 3.

[0005]

When the bolts 2 and nuts 3 are retightened by the scaffolding 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 to that, since the diameter of the bolt 2 is relatively large, the weight of the nut runner becomes considerably heavy, which is dangerous and also 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 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 retightening device capable of safely and efficiently performing a retightening operation on bolts and nuts for fastening segments of a shield tunnel.

[0008]

SUMMARY OF THE INVENTION A segment tightening device for a shield tunnel according to the present invention comprises a traveling platform movable along the shield tunnel and a traveling platform fixed to the traveling platform along an inner peripheral surface of the shielding tunnel. A semi-circular guide beam, a work platform rotatably supported by a guide carriage movable along the guide beam via a horizontal base support shaft, the work bench and the guide carriage. Installed on the work table, a horizontal holding mechanism that is provided between the two to hold the work table in a horizontal state, a nut runner that can be detachably fitted to any of bolts and nuts that fasten the segments of the shield tunnel. And a nut runner holding arm having the above-mentioned nut runner mounted at its tip and capable of arbitrarily changing the direction of the nut runner, and this nut runner holding arm. 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]

Operation: The traveling platform is moved along the shield tunnel and the guide truck is moved along the guide beam to position the work table in the vicinity of the segment at the position to be retightened. At this time, the workbench is always held in a horizontal state by the horizontal holding mechanism regardless of the position of the guide carriage with respect to the guide beam.

From this state, the nut runner holding arm is operated to engage the nut runner with one of the bolt and the nut to be tightened, and the nut runner is driven to tighten the bolt and the nut. In this case, the posture of the nut runner holding arm is maintained as it is by the arm balancer in any posture.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and its II- showing the appearance of an embodiment of a segment tightening device for a shield tunnel according to the present invention.
II As shown in FIG. 2 showing the cross-sectional shape as viewed from the arrow II, the bolt 1 is accompanied by the propulsion of a shield excavator (not shown) against the natural ground 11.
The segments 14 are sequentially assembled in an annular shape via the 2 and the nut 13, and the sleepers 16 are horizontally laid at predetermined intervals in the shield tunnel 15 formed thereby.

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

As shown in FIGS. 1 and 2 and FIG. 3 showing an enlarged cross-sectional structure of the arrow III portion thereof and FIG. 4 showing its IV-IV arrow cross-sectional structure, a guide surface formed on the guide beam 22. Two
The guide wheels 23, which can roll along 0, 21, are rotatably mounted, and the guide wheels 24 that sandwich the guide beam 22 by these guide wheels 23 have guide surfaces 20, 21 on the side wall portions of the guide beam 22. A bogie drive motor 27 is installed in which a pinion gear 26 that meshes with a sector gear 25 that is provided coaxially with and is engaged is installed.

The base end of the base support shaft 28 that projects horizontally from the guide carriage 24 is rotatably attached to the guide carriage 24 via a bearing metal 29. A workbench base 30 having a flat plate shape is integrally fixed. A drive gear 33 connected to the carriage drive motor 27 via a speed reducer 32 installed in a guide carriage 24 meshes with a driven gear 31 fitted to a tip end portion of the base support shaft 29. The speed reducer 32 is arranged so that the angular movement amount of the guide carriage 24 with respect to the guide beam 22 corresponds to the turning angle of the base support shaft 28.
The reduction ratio of is set.

Therefore, by setting the meshing state of the driven gear 31 and the drive gear 33 in advance so that the surface of the workbench base 30 becomes horizontal, the guide carriage 2
It is possible to keep the surface of the workbench base 30 always horizontal regardless of the position of the guide beam 22.

As shown in FIGS. 1 and 2 and FIG. 5 showing the enlarged structure of the main part thereof and FIG. 6 showing the plan view thereof, a pair of work bases 30 are laid on the work base 30. A workbench 36 having traveling wheels 35 that can be driven and rotated to be rolled in an engaged state is mounted on the groove-shaped guide rail 34 of FIG.
Around the circumference of 6 is provided a fall prevention enclosure 37.

On the workbench 36, a swivel strut 39 projecting from the lower end of the balancer body 38 is rotatably supported in a vertical state via a swivel bearing 40.
The base ends of a pair of front-rear movement arms 41 are attached to the lower end of 8, and the front-rear movement arms 41 can be tilted in the left-right direction in FIG. 5 while maintaining their parallel state. In addition, at the tip of the pair of front and rear movement arms 41, a pair of three vertical movement arms 4 is provided via two pins 42.
One base end of 3 is pivotally attached, and both ends of the pair of vertical movement arms 43 are connected to each other via link plates 44 and 45 so as to form a parallelogram link device.

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

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

In the link plate 45 connecting the base end side of the vertical movement arm 43, the tip end side of the vertical movement arm 43 hangs downward in FIG. 5 due to the weight of the tip end side of the vertical movement arm 43. A counter weight (not shown) for preventing is connected via a suspension rod 52, and a balance cylinder (not shown) for urging the tilting force of the forward / backward movement arm 41 to the right in FIG. 5 is a balancer main body 38 and one forward / backward movement arm. It is interposed between 41 and 41. As a result, the tool holder 48 can hold its posture as it is, and almost no operation force or holding force for the tool holder 48 is required, and the operator can operate the tool holder 48 and the air tool 50 very easily. You can

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 workbench is caused to travel along the semi-circular guide beam, and at this time, the workbench is always held horizontal by the horizontal mechanism, while the nut runner is kept horizontal. Is attached to the tip of the nut runner holding arm attached to this workbench, and an arm balancer is interposed between the nut runner holding arm and the workbench. Alternatively, it is possible to engage with the nut, the labor required for the additional tightening work can be significantly reduced as compared with the conventional one, and the additional tightening work itself can be performed more efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an appearance of an embodiment of a shield tunnel segment retightening device 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.

FIG. 6 is a plan view thereof.

FIG. 7 is a conceptual diagram showing a construction state of a scaffold used during a retightening operation of segments in a conventional shield tunnel.

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

[Explanation of symbols]

11 is a solid 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 pedestal, 20 and 21 are guide surfaces, 22 is a guide beam , 23 is a guide wheel, 24 is a guide carriage, 25 is a sector gear, 26 is a pinion gear, 27 is a carriage drive motor, 28 is a base support shaft, 29 is a bearing metal, 30 is a workbench base, 31 is a driven gear, and 32 is a speed 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 main body, 39 is a swivel column, 40 is a swivel bearing, 41 is a longitudinal arm, 42 is a pin, 43 is a vertical arm, 44, 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.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichiro Kikuta 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Tsutomu Yasuda Wadamiya-dori, Hyogo-ku, Hyogo Prefecture 7-1-14 Nishiryo Engineering Co., Ltd.

Claims (1)

[Claims] 1. A traveling platform movable along a shield tunnel, a semi-arcuate guide beam fixed to the traveling platform along the inner peripheral surface of the shield tunnel, and movable along the guide beam. Work platform that is rotatably supported by a horizontal support shaft that is horizontal with respect to the guide carriage, and a horizontal work table that is provided between the work bench and the guide carriage and holds the work platform in a horizontal state. A holding mechanism, a nut runner that can be detachably fitted to any of a bolt and a nut that fastens the segment of the shield tunnel, and a nut runner that is installed on the workbench and that has the nut runner attached to its tip and the orientation of the nut runner. The nut runner holding arm that can be arbitrarily changed, and the nut runner holding arm that is interposed between the nut runner holding arm and the workbench can be placed in any posture. Segment retightening device for shield tunnel with arm balancer for balancing.