JP3827160B2 - Tunnel repair method - Google Patents

Description

  The present invention relates to a tunnel repair method used for roads, railways, and the like, and more particularly, to propose a tunnel repair method for repairing a decrease in water stoppage performance of a tunnel constructed by a shield method.

  In the shield method, a method of constructing a cylindrical tunnel by connecting arc-shaped segments is adopted. A seal groove for storing the seal material is formed on the joint surface between the segments, and the seal material is bonded to the seal groove in advance when the seal material is attached in advance to the cylindrical portion to obtain a water stop performance. ing.

Since the tunnel constructed by the shield construction method is constructed by a combination of a large number of segments, it has a property that water leakage is likely to occur from the joint portion of the segment, that is, the joint portion.
The water leakage path of the shield tunnel can be roughly divided into a segment main body (made of reinforced concrete) and a joint. The concrete of the segment body part is often a dense concrete as compared with cast-in-place concrete, and the occurrence of cracks is relatively small. Cracks are often found around backfill injection holes and joint hardware, and often occur due to the behavior of concrete and metal. Also, there are cracks due to the thrust of the shield jack during construction, cracks due to excessive pressure due to tail seals and segment serrations during curved construction, and water leakage to the extent that water bleeds is seen from such through cracks However, the amount is not much compared to the total amount.

On the other hand, water leakage from the joint is often observed when the sealing material is damaged during construction and when the sealing material deteriorates over time, which is overwhelmingly larger than the amount of water leakage at the segment main body.
Conventionally, for water leakage from joints, for example, a water-stopping material is pasted inside the segment, joints such as epoxy resin are injected on the joint surface, or an inorganic material or urethane material is injected on the back of the segment. The technique is taken.
However, the above construction method is not a definitive construction method because economic problems and confirmation of effects are not sufficient. Originally, since there is a seal groove in the joint part of the segment, it is possible to obtain the original water stop performance at the time of design by injecting a liquid resin material into the seal groove. It was not implemented for such reasons.

In other words, since there is a deteriorated seal material in the seal groove, a new injection material cannot be sufficiently distributed. In addition, soil particles that have entered from the outside of the segment may be present in the seal groove. Furthermore, when the amount of water leakage is extremely large, the injected material may flow and may not solidify. However, the presence of a particularly deteriorated seal material is the biggest reason that reinjection is difficult.
An object of the present invention is to propose a tunnel repairing method capable of repairing without being disturbed by a sealing material having deteriorated water blocking performance of a shield tunnel.

  According to the first aspect of the present invention, a cylindrical tunnel is constructed by connecting arc-shaped segments, a sealing material is attached to a sealing groove formed at a joint portion between the segments, and water enters from the outside by the sealing material. In a shield tunnel with a structure that stops water, a plurality of working holes communicating with the seal groove are formed along the seal groove on the inner wall surface of the shield tunnel, high pressure water is injected through the work hole, and the high pressure water is used to seal the seal groove. Crush the sealing material that was mounted on the pipe, suck out the crushed sealing material from other working holes, and inject the new sealing material into the sealing groove from which the sealing material has been removed, and place this new sealing material inside the sealing groove. We propose a tunnel repair method to fix the water-stopped condition by consolidation.

  According to the second aspect of the present invention, a cylindrical tunnel is constructed by connecting arc-shaped segments, a sealing material is attached to a sealing groove formed at a joint portion between the segments, and water enters from the outside by the sealing material. In a shield tunnel with a structure that stops water, a plurality of working holes communicating with the groove are formed along the groove on the inner wall surface of the shield tunnel, and an elastic tool that can be bent is inserted into the seal groove through the working hole. The seal material is crushed by rotating the inside of the seal groove, and the crushed seal material is sucked out from other working holes, and a new seal material is injected into the seal groove from which the seal material has been removed, and the seal material is sealed. A tunnel repair method is proposed in which the water stop function is restored by solidifying inside the groove.

A third aspect of the present invention proposes a tunnel repairing method according to any one of the first and second tunnel repairing methods, wherein the new sealing material is injected directly into the working hole.
According to a fourth aspect of the present invention, in the tunnel repair method according to the first or second aspect, the injection of the sealing material is performed by placing an injection tube in advance in the sealing groove into which the sealing material is to be injected, and the inside of the sealing groove through the injection tube. We propose a tunnel repair method in which a sealing material is filled.

  As described above, according to the present invention, the old sealing material can be removed almost completely, so that a new sealing material can be injected smoothly. As a result, it is possible to restore the shield tunnel, which is severely deteriorated, to the original water stop performance at the time of design. Moreover, since a certain water stop effect can be expected, useless injection material is unnecessary, and the construction cost can be reduced.

  According to this invention, a plurality of working holes are formed along the joints between the segments, and the old sealing material stored in the seal groove is pulverized through the working holes with high-pressure water or a bendable elastic tool. The old seal material is removed from the seal groove by sucking the crushed seal material through another working hole, and the seal material is newly injected into the seal groove from which the seal material has been removed. As a result, the new sealant can be spread over the entire seal groove, and water leakage occurring at the joints between the segments can be stopped almost completely, and the water stop performance can be restored. .

An embodiment of a tunnel repair method according to the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of a part of the inner wall surface of the shield tunnel and the ring. That is, A indicates the inner wall surface of the shield tunnel, and B indicates the ring cross section. The inner wall surface A is formed by the arc surfaces of a number of segments 1. The inner wall surface A shown in FIG. 1 represents the inner wall surface of the tunnel ceiling.
Each segment 1 is composed of concrete blocks each having an arc surface, and this concrete block is connected in the circumferential direction to form a ring, and this ring is connected and extended in the axial direction of the ring to construct a tunnel. Is done. In the figure, 2 indicates a joint surface in the ring direction of the segment 1 (hereinafter referred to as a ring joint surface), and 3 indicates a joint surface that connects the segment 1 in the ring direction (hereinafter referred to as a segment joint surface). In general, two seal grooves 4 are formed on the ring joint surface 2 and the segment joint surface 3 in the circumferential direction and the tunnel extending direction, and a seal material is attached to the seal grooves 4.

  In the present invention, work holes 5 communicating with the seal groove 4 from the inner wall surface A side of the tunnel are formed at appropriate intervals. As an example, a drill having a diameter of about 20 mm is drilled at intervals of 500 to 1500 mm in the circumferential direction. Assuming that the drilling operation of the working hole 5 is the first step, the second step is a step of removing the old sealing material attached to the seal groove 4.

As a method for removing the old sealing material, the present invention proposes a water pressure method and a mechanical grinding method. The water pressure method will be described with reference to FIG.
Reference numeral 6 shown in FIG. 2 denotes a high-pressure pump that generates high-pressure water. High-pressure water is generated by the high-pressure pump 6, and the high-pressure water generated by the high-pressure pump 6 is injected into the work hole 5 through the pipe 7. A nozzle 8 is formed at the tip of the pipe 7 in a direction perpendicular to the axis. High pressure water is injected from the nozzle 8 into the seal groove 4, and the old seal material mounted in the seal groove 4 is crushed with water pressure.
A suction device 9 is connected to the work hole 5 adjacent to the work hole 5 into which high-pressure water is injected, and the water injected by the suction device 9 is sucked and collected. The old seal material pulverized by the water recovery and suction can be taken out of the seal groove 4 and removed from the seal groove 4. By performing this operation between each of the outer seal groove and the inner seal groove and the work hole 5 in the axial direction of the tunnel, and further moving and repeating in the circumferential direction at intervals of each work hole 5, The old seal material can be removed from the entire seal groove 4 formed in the ring direction.

  The mechanical removal direction will be described with reference to FIGS. In this case, the insertion tube 11 is prepared, and the elastic tool 12 is fed out from the tip of the insertion tube 11 in a direction perpendicular to the axis of the insertion tube 11. As the elastic tool 12, for example, a coil spring formed of a steel wire or a wire obtained by bundling a plurality of steel wires can be used. The elastic tool 12 is wound around, for example, a drum (not shown in particular) or the like, and the elastic tool 12 is expanded and contracted by feeding from the drum. Further, the drum is rotated about the radial direction of the drum, and the elastic tool 12 is rotated about the longitudinal direction. With the rotation, the elastic tool 12 is fed out from the drum, the elastic tool 12 enters the seal groove 4, and the tip of the elastic tool 12 is moved along the seal groove 4.

  FIG. 4 shows an example of the structure of the portion for feeding the elastic tool 12 from the distal end of the insertion tube 11. A curved surface 11 </ b> A is provided on the inner wall at the tip of the insertion tube 11, and a hole 11 </ b> B is formed on the peripheral surface of the insertion tube 11. The elastic tool 12 drawn along the axis of the insertion tube 11 is changed in direction by the curved surface 11A and fed out of the insertion tube 11 from the hole 11B. The feeding direction is substantially perpendicular to the axis of the insertion tube 11 and coincides with the orthogonal angle between the seal groove 4 and the work hole 5. By feeding the elastic tool 12 along the seal groove 4 while rotating, the old seal material mounted in the seal groove 4 is crushed. At the same time, the old sealing material crushed by sucking air in the suction device 9 from the adjacent work hole 5 is sucked into the suction device 9 and collected.

  Other methods for removing the old sealing material include: a method of dissolving a foreign material by injecting a solution that dissolves the sealing material from the working hole, and collecting the solution from the adjacent working hole 5; It can be considered that the solution is sprayed from the working hole 5, the old sealing material is deteriorated by the bacterial solution, and the foreign matter is removed by the above-described hydraulic method in a sufficiently deteriorated state.

After removing the old sealing material from the sealing groove 4, a new sealing material is injected as a third step. The properties required for the sealing material used for this injection are:
1. After consolidation, the adhesiveness with the segment 1 is high,
2. After consolidation, follow the opening of the segment 1 (deformation of the seam),
3. Good plastic fluidization and low-pressure injection possible (high-pressure injection increases the escape amount of the injected material)
4). Is inflatable to water,
5). The material is hard to deteriorate,
In general, examples of the injection material or the joint sealing material include polyurethane (with water expandability), epoxy, polysulfide, silicone, aquaprene (with water expandability), and the like. Among these, it is considered that both polyurethane (2 liquid) and aquaprene (1 liquid) are suitable. However, the one-component aquaprene system is an injection material that solidifies only by the reaction of water, and it takes a long time to solidify. On the other hand, in the case of two-component polyurethane, the gel time can be hardened as fast as 50 to 70 seconds. Therefore, at the present time, two-component polyurethane is considered the most appropriate as an injection material.
As a method of injecting the sealing material, a method of injecting the sealing material directly into the working hole 5 and a method of injecting through the injection tube are conceivable.

  FIG. 5 shows a method of directly injecting the sealing material through the working hole 5. In this case, A liquid and B liquid are respectively supplied to the pump 13 from the tanks 14A and 14B, and the two liquids are mixed and pushed out by the pump 13, and a new sealing material 16 is injected into the seal groove 4 through the injection pipe 15. Show. At the beginning of the injection, the outer seal groove is injected, and when the seal material reaches the outer seal groove 4, the inner seal groove is injected. During the injection, the work hole 5 adjacent to the work hole 5 being injected is monitored, and the injection is terminated when the sealing material 16 is filled to a predetermined level of the work hole 5.

  FIG. 6 shows how the sealing material 16 is injected using the injection tube 17. Although the structure of the injection tube 17 is well known, the structure is such that, for example, the elastic tool 12 as described with reference to FIGS. Using the elasticity of the elastic tool 12, a bag of cloth or the like is bent from the work hole 5 into the seal groove 4, and the bag is passed through the seal groove 4 by the elastic tool 12. The rough part of the bag is only the part passed to the seal groove 4, and when a new seal material 16 is injected from the end of the bag, the new seal material 16 is evenly distributed in the seal groove 4 from the bag eye. The liquid is squeezed out of the bag and injected into the entire seal groove 4. By using the injection tube 17 in this way, the sealing material 16 always oozes out at the position where the injection tube 17 is present, so that the rate at which a hollow portion where the sealing material 16 does not exist can be reduced.

  The tunnel repairing method according to the present invention can be applied to repairing any tunnel regardless of whether it is a railway tunnel or a road tunnel, and is effective in preventing deterioration of the tunnel.

The perspective view which made the cross section a part for demonstrating the drilling state of the working hole used as the 1st process of the tunnel repairing method of this invention. Sectional drawing for demonstrating an example of the removal method of the old sealing material used as the 2nd process of the tunnel repairing method of this invention. Sectional drawing for demonstrating the other example of the removal method of the old sealing material used as the 2nd process of the tunnel repairing method of this invention. Sectional drawing which expands and shows a part of FIG. Sectional drawing for demonstrating the injection method of the sealing material used as the 3rd process of the tunnel repairing method by this invention. Sectional drawing for demonstrating the other example of the injection method of the sealing material used as the 3rd process of the tunnel repairing method by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment 8 Nozzle 2 Ring joint surface 9 Suction device 3 Segment joint surface 11 Insertion pipe 4 Seal groove 11A 弯 Curved surface 5 Work hole 11B Hole A Inner wall surface 14A, 14B Tank B Ring cross section 15 Injection pipe 6 Pump 16 New seal material 7 Pipe 17 Injection tube

Claims (4)

A shield tunnel with a structure in which arc-shaped segments are connected to form a cylindrical tunnel, and the ingress of water from the outside is stopped by a sealing material that has been affixed in advance to the seal groove formed at the joint between the segments. In
A plurality of working holes communicating with the seal groove are formed on the inner wall surface of the shield tunnel along the seal groove, high pressure water is injected through the work hole, and the sealing material attached to the seal groove with the high pressure water is used. Crushing and sucking out the crushed seal material from other working holes, injecting new seal material into the seal groove from which the seal material has been removed, and consolidating the new seal material inside the seal groove, A tunnel repair method characterized by repairing a state. A shield tunnel with a structure in which arc-shaped segments are connected to form a cylindrical tunnel, and the ingress of water from the outside is stopped by a sealing material that has been affixed in advance to the seal groove formed at the joint between the segments. In
A plurality of working holes communicating with the groove are formed in the inner wall surface of the shield tunnel along the groove, and an elastic tool that can be bent through the working hole is inserted into the seal groove, and the elastic tool is inserted into the seal groove. The seal material is rotated to pulverize, and the crushed seal material is sucked out from another working hole, and a new seal material is injected into the seal groove from which the seal material has been removed, and the seal material is placed inside the seal groove. A tunnel repair method characterized by fixing the water stop function by consolidation.   3. The tunnel repairing method according to claim 1, wherein the new sealing material is injected directly into the working hole.   3. The tunnel repair method according to claim 1, wherein the sealing material is injected by placing an injection tube in a sealing groove into which the sealing material is to be injected, and filling the sealing material into the sealing groove through the injection tube. Tunnel repair method characterized by this.

Images