JP3031502B2 - How to repair segment joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting a gap or the like generated at a joint when joining segments in a shield method.

[0002]

2. Description of the Related Art As is well known, the shield method is an excellent method for forming tonnel or the like in soft ground. In this method, excavation of the ground is performed at the front part while preventing the ground from being collapsed by a shield made of a tubular iron plate. Behind the shield, a tail plate made of a cylindrical iron plate is rotatably connected at a predetermined angle. By the rotation of the tail plate, the excavation direction of the tunnel can be changed.

[0003] In the tail plate, a ring-shaped body is formed by joining segments made of reinforced concrete or the like which have been previously divided at a factory or the like into an annular shape. Then, this is connected to the ring-shaped body that has already been assembled and is present behind.

Thereafter, a jack is applied to the joined new ring-shaped body to advance the shield and the tail plate. As a result, the ring-shaped body is long and connected in a tubular shape to support the ground of the tunnel.

[0005] When the tunnel is located deep under the water table, the tail plate and the cylindrical body move during the forward movement.
Watertightness must be maintained while sliding through the sealing device. For this reason, the outer periphery of the ring-shaped body assembled by joining the segments must be clean and continuous, and must not have irregularities. Also, if there is a gap at the joint between the segments, watertightness cannot be maintained.

[0006]

However, conventionally,
Due to the accuracy of segment production, joining work and joining work, openings (gaps may occur) or misalignments (steps may occur and irregularities may occur) may occur at the joining and joining parts. . If these openings and misalignments are left, the watertightness between the tail plate and the segment is adversely affected, and there is a risk that the watertightness may be broken particularly in a shield method under high water pressure. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has the object of correcting segment opening and misalignment, and maintaining good watertightness between the segment and the tail plate. The purpose of the present invention is to provide a method for correcting a part.

[0008]

In order to achieve the above object, the present invention has the following arrangement. That is,
Drilling is performed at the front of the cylindrical shield, the segments are joined in a ring shape in the rear cylindrical tail plate to form a ring, and connected to the already joined rear ring, In the shield construction method in which the shield and the tail plate are moved forward by applying a jack to the joined ring-shaped body, if there is an opening or misalignment in a joint or a joint of the segments, the segment is temporarily removed,
The plastic deformable material is placed in the vicinity of the place where the openings and misalignments exist, and then the removed segment is re-installed, and the plastic deformable material is pressed by a compaction device provided on the inner peripheral surface of the tail plate. By crushing and compacting, the joints of the segments or the joints are corrected.

[0009]

A compaction device is provided on the inner peripheral surface of the tail plate, and the joint or the connecting portion outside the segment can be corrected by the compaction device. In addition, it is possible to correct unevenness on the outside due to misalignment, and to maintain good watertightness between the segment and the tail plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. A tail plate 1 is connected to a rear portion of a shield (not shown) for excavating the ground in a rotatable state within a predetermined angle range. This tail plate 1 is made of a tubular iron plate, and internally joins the segments 2 in an annular shape and fixes them with key segments 2A.
Assemble the ring-shaped body 3.

A newly assembled ring-shaped body 3 (FIG. 2)
Are connected to the rear ring-shaped body 3 already assembled. The new ring 3 is jacked, and the shield and tail plate 1 (not shown) are advanced. At the time of this forward movement, a sealing device (not shown) provided on the inner peripheral surface of the tail plate 1 and made of rubber with a spring called a wire brush is used for the segment 2 and the tail plate 1.
Keep watertight between and. This sealing device is provided on the entire circumference of the tail plate 1. A compacting device 4 shown in FIG. 1 is provided on the inner peripheral surface of the tail plate 1 in front of the sealing device.

In the compacting device 4, a compacting plate 5 is suspended from the inner peripheral surface of the compacting device 4 via a spring 6 fixed to the tail plate 1. The side surface of the plate 5 along the tail plate 1 has an arc shape. The reverse side of the plate 5, that is, tail plate side, the compressed air injection ports 7 for injecting radially outward are provided two right and left, by the reaction injection of compressed air, the plate 5 to the segment 2 side You can hit it.

On the other hand, as the plastically deformable material 8 inserted between the tail plate 1 and the segment 2, various fillers for filling gaps between concrete members, for example, asphalt can be used.

In this embodiment, the compacting device 4 comprises:
It is provided only on one part of the joint 9 of the key segment 2A. That is, when assembling the ring-shaped body 3, after joining the five segments 2 other than the key segment 2A, the key segment 2A is inserted and joined. Therefore, openings and misalignments in the joint 9 are likely to occur in the joint 9 of the key segment 2A in the final stage of assembly, and thus can be provided only in this portion. However, in other embodiments, other joints (six in the figure) or the connecting portion 1
1, it is also possible to provide it on the entire circumference.

The operation of this embodiment will be described below.
After joining the segments 2 and assembling the ring-shaped body 3, an optical fiber scope device or the like inserted between the segment 2 and the tail plate 1 and the like causes a gap between the key segment 2 </ b> A and the segment 2, such as an opening or misalignment. Check for any defects. If the presence of a defect is recognized, the segment 2 near the opening or the like is temporarily removed. Then, the rod-shaped plastic deformation material 8 is placed near the joint 9 to be corrected.

Next, compressed air is injected from the injection port 7 intermittently or continuously while being appropriately switched, and the compressed air is struck against the plastically deformable material 8 while vibrating the plate 5 in the radial direction. Then, the plastically deformable material 8 is crushed, and the joint 9
(Dotted line in the figure).

In this way, as shown in the figure, the step due to the difference is corrected by the plastic deformation material 8, and the unevenness due to the step can be eliminated. Therefore, the sealing device existing on the inner peripheral surface of the tail plate 1 can work well.

[0018] Instead of the above difference, even when there is a gap and there is a gap, the gap can be similarly filled with the plastic deformation material 8. Furthermore, even when there is an opening or misalignment not in the joint part existing in the axial direction of the shield but in the connecting part existing in the circumferential direction, the same correction can be made. In this case, it is desirable that the shape of the plate 5 be elongated in the circumferential direction.

In the above-described embodiment, the plate 5 of the compacting device 4 is driven against the segment 2 by injection of compressed air. However, the plate 5 may be driven against the segment 2 by another driving method. .

As described above, according to the present embodiment, defective portions such as openings or misalignments of the joints 9 or the connecting portions 11 of the segments 2 can be corrected by using the plastically deformable material 8. Therefore, the ring-shaped body 3 is removed from a gap such as an opening.
It is possible to suppress the possibility that the watertightness between the ring-shaped body 3 and the tail plate 1 is broken because the sealing device does not work well due to water leaking into the inside or unevenness due to misalignment.

Incidentally, the ring-shaped body 3, that is, the segment 1
And the shield, that is, the watertightness between the tail plate 1 is a problem particularly because defects such as openings and misalignments are present not in the circumferential connecting portion 11 but in the radial joining portion 9. Is the case.

On the other hand, a defect in the circumferential direction is such that the sealing device is provided with a plurality of rubbers with springs that are continuous in the circumferential direction in multiple stages in the axial direction, so that water sealing can be achieved in multiple stages in the axial direction.
It does not cause much trouble. In contrast, axial defects are:
In many cases, the length of the seal device provided with the rubber with the multistage spring in the axial direction is longer than the length in the axial direction, and it is often extremely difficult to maintain watertightness. Therefore, it can be said that the repair direction of this embodiment is extremely effective for the defect of the joint 9.

[0023]

As described above, according to the segment joint correcting method of the present invention, the joint or connection of the segments assembled in the ring-like body by the compacting device provided on the inner peripheral surface of the tail plate. It is possible to easily correct the gaps and misalignments of the sections. Therefore, the watertightness between the outside of the segment and the inside of the tail plate can be kept good, and the danger of breaking watertight even in the shield method under high water pressure can be eliminated.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view (A part enlarged view of FIG. 3) of a front showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a schematic overall view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tail plate 2 ... Segment 3 ... Ring-shaped body 4 ... Compacting device 5 ... Plate 6 ... Spring 7 ... Compressed air injection port 8 ... Plastic deformed body 9 ... Joint part 11 ... Connecting part

Claims (1)

(57) [Claims] An excavation is performed at a front portion of a cylindrical shield, and segments are annularly joined in a rear cylindrical tail plate to form a ring-shaped body. In the shield construction method in which the shield and the tail plate are moved forward by applying a jack to the joined ring-shaped body and thereafter, if there are openings or misalignments in the joints or joints between the segments, the segments are temporarily removed. Remove, place the plastic deformation material near the place where the openings and misalignment exist, then re-install the removed segment, and press the plastic deformation material by the compaction device provided on the inner peripheral surface of the tail plate. A method for repairing a segment joint, comprising crushing and compacting a material to correct a joint or a joint of the segments.