JPS6319439Y2 - - Google Patents

Description

[Detailed description of the invention] This invention easily stops water leakage from the joints of the lining ring or after the injection port after the primary lining in shield excavation work, making the secondary lining easier. This relates to a segment of a ring for lining an excavated part using the shield construction method, which is equipped with a mechanism that allows for lining of an excavated part.

As is well known, in the method of excavating a tunnel underground, in order to complete the intended tunnel by covering the excavated cavity wall, ring segments for lining are sequentially assembled and the excavated ground is fixed. When the lining segments are sequentially assembled and connected to the ring, segment mortar or the like is injected back into the space between the back side and the ground and allowed to solidify.
It is designed to fill the space and prevent underground water from entering the tunnel, but since many segments are connected and lined within the underground tunnel over a period of time, it is difficult to completely fill the tunnel with backfilling material. It is practically difficult to completely stop the water. When we consider the causes, we find that, for example, there is insufficient filling of backfilling material.In this case as well, there are various phenomena, but it is difficult to confirm the actual cause. The backfilling material is not sufficiently applied to the lower part of the lining ring, and the segments and the ground are in contact with each other, so groundwater leaks inward from the connecting parts of the segments through the contact with the ground, or The backfilling material is injected into the ground excessively through the voids in the ground, and the backfilling is performed unevenly around the lining ring, so that the water-stopping effect of the backfilling material is not exhibited. Or, the sealing gasket attached to each segment is damaged during segment assembly, combined with uneven injection of backfill material, or high water pressure in the ground (great underground depth). Water leaks from an incompletely sealed area where backfilling is not sufficient. In addition, when the shielding machine is propelled, the fluctuation of the reaction force acting on the lining ring causes a breakage phenomenon between the backfilling part and the ring, causing a fractured state in the backfilling material injection layer, or when the shielding Water leakage due to destruction of the backfill material injection part, such as when cracks occur in the backfill layer due to knocking phenomenon when the machine is propelled. Furthermore, the segments during lining cannot be assembled in a perfect circle, but are assembled in a slightly oval shape, which causes the joints of the segments to expand and reduce the sealing effect.
Water leaks from this part. Furthermore, when the shield machine is propelled, the jacks do not act on the uniform rear segments, causing distortion and deformation of the joints of the lining ring, which causes water leakage, among other problems. Another problem is that these things occur in combination.

Therefore, in the past, the leakage area was caulked using caulking material from the inner surface (tunnel side) of the lined connection part of the segments to stop the water.
However, in order to carry out this caulking work, the leakage area must be covered with caulking material from the front side inside the tunnel after checking for the presence or absence of water leakage, so the leakage will move to adjacent areas one after another, and as a result, the connection area will be covered with caulking material from the front side. There are also disadvantages that arise when caulking is required over a wide area. Furthermore, since this caulking work must be done before water leakage becomes severe, the work efficiency is low and, of course, the construction costs will increase.

Furthermore, the sealing function when screwing in the cap at the backfilling material injection port after backfilling injection work may not be sufficient, or even if the cap is not used, the sealing process may be insufficient when attaching the cap to the backfilling material injection port. (Generally, when screwing the cap into the injection port, the screw is screwed together with sealing tape wrapped around the threaded part, and this sealing tape is not kept evenly wrapped around the threaded part, resulting in parts being screwed together.) (The tape may break or become uneven, resulting in an uneven seal.) If water leaks occur, this is often due to high water pressure underground (such as when the tape is excavated deep underground). Often,
In particular, tunnels excavated at the bottom of rivers or the bottom of the seabed are naturally deep, so the water pressure associated with that is also high.) It is dangerous to remove the cap, repair the seal, and reinstall it. (If the cap is removed, high-pressure water will gush into the tunnel, making it difficult to reinstall the cap.) In principle, the problem must be dealt with without removing it.

The object of the present invention is to solve these problems and provide a segment of a lining ring that can be taken in advance so that measures against water leakage associated with the primary lining can be easily implemented.

The ring segment for lining of the present invention has gasket mounting grooves at appropriate locations on the outer surface and inner surface of the segment on at least two adjacent joining surfaces of the joint during assembly, and the two gaskets A water stop agent filling groove of an appropriate size is carved between the mounting grooves, and this water stop agent filling groove is connected to a water stop agent injection plug with a built-in check valve attached to an appropriate position inside the segment with a conduction hole. Further, the backfill material injection port is equipped with a cap with a water stop agent injection plug installed in the center of the top.

In addition, in the present invention, in the steel plate segments, an inclined machined surface of an appropriate size is formed on the end joint surface side of the connecting flange, and when it is necessary to strengthen the connection of the segments after assembly, the joined flange part The welding groove is formed by both inclined machined surfaces.
This enabled reliable welding.

Below, the present invention will be explained in detail with reference to embodiment figures.
The figure shown is steel plate lining ring segment 1.
In one specific example, each outer surface 2', 3' of a flange 2 on one long side forming a joint of the segment 1 and a flange 3 on one short side adjacent thereto is , as shown in FIG. 2, between the segment top plate 4 and the flange end face 5, a gasket mounting groove 6, a water stop agent filling groove 7, a gasket mounting groove 6', and a fastening groove are formed in order from the top plate 4 side. Bolt holes 8 are provided, the grooves 6, 7, and 6' are carved on the two surfaces at required intervals, and the water stopper filling grooves 7 communicate with each other. . A sealing gasket 9 is installed in advance in the gasket fitting grooves 6, 6', or a gasket is installed during assembly. In addition, for the water stop agent filling groove 7, the side opposite to the joint surface, that is, the flange 2 (or 3)
A water stop agent injection tap 10 with a built-in check valve is installed at one or more appropriate locations inside the housing via a connecting pipe 11, and the end of the connection hole 12 leading to the injection tap 10 is free from foreign matter. A temporary sealing thin film piece 13 is attached to prevent the intrusion of. A water-stop cap 20 as shown in FIG. 3 is screwed onto the backfill material inlet 15 provided in the lining ring segment 1. The inside of the boss 22 for attaching a wrench protruding from the center of the outer surface of the main body 20 is made into a recess 23, and a water stop agent injection tap 10' with a built-in check valve is attached thereto. In order to prevent foreign matter from entering, a suitable amount of a flexible foreign matter intrusion prevention material 24 such as sponge is filled, and a protective cover 25 is attached to the outside of the injection plug 10'.

Incidentally, it is also possible to adopt a structure in which the joining surface side of the end of the flange 2 (or 3) described above is cut into the inclined surface 14 with appropriate dimensions. It can be used as a groove when welding together with the ring cement flange (see Fig. 4).

The ring segment 1 for lining of the present invention constructed as described above is assembled by sequentially arranging it in the tail part of a shield machine so that the side adjacent to the gasket 9 mounting surface has a flat joint surface, and then attaching it to the excavation part. After that, backfilling material can be injected for primary lining.If there is no water leakage, the lining work is completed in the same way as for conventional segments, but for some reason. If there is a leakage point at the joint, please use the nearest injection valve 1.
By injecting a water stop agent (for example, a urethane-based agent) from 0 using an injection device (not shown), the joints of the segments 10 are formed by filling the voids on the ground side A with backfilling material, as shown in Figure 5. B is filled in the inlet, and this layer is sealed by the outer gasket 9, and the inside of the tunnel is sealed by the inner gasket 9. Water stop agent filling groove 7
The water stop agent C is injected and filled into the entire space formed by the groove, and by filling not only the groove but also the space between the gaskets 9 and 9 before and after the groove, it stops water that comes into contact with leakage water that has flowed into the joint. The agent reacts and condenses in the area, sealing the area and preventing water from entering other areas. In addition, if an external force acts on this locally water-stopped area and water leaks, even if only slightly, to the adjacent area, the unreacted water-stopping agent will react and quickly stop the water. Water leakage can be easily prevented.

In addition, if water leaks from the backfilling material injection port 15 after the backfilling material injection work, the external By removing the protective cover 25 and pressurizing a water stop agent into the interior from the injection plug 10' using a water stop agent injection device, the foreign matter intrusion prevention material 24 inside is pushed away to the ground side and inside the backfill material injection port 15. By allowing the water stop agent to flow into the area, the pressure water that has gathered in the area reacts with the water stop agent and condenses, making it possible to quickly stop water leakage.

In addition, in the ring segment for lining described above, it is also possible to adopt a structure in which the water stop agent filling groove 7 is carved all the way around the outer surface of the entire flange. (It is not limited to this.) As mentioned above, according to the present invention, the water stopper injection part and the filling part are leaked in advance at the joint part of the lining ring segment or the backfilling material injection port, respectively. Therefore, even if the cause of water leakage is unknown, the chemical agent can be prevented by injecting the prepared stopper from the injection valve at the required location in case of water leakage. By injecting the main part, the objective can be easily achieved without requiring excessive injection of chemicals, and water leakage can be prevented economically.

Accordingly, in accordance with the spirit of the present invention, it can be applied to segments of concrete lining rings instead of the above-mentioned steel segments, and one example of this is shown in Fig. 6. In the same manner as the above-mentioned steel one, a water stop agent filling groove 7a is provided between the gasket mounting grooves 6a and 6b on the required two side joint surfaces, and this water stop agent filling groove 7a is provided between the gasket mounting grooves 6a and 6b. 7
For a, a water stop agent injection hole 12' is drilled from a suitable location on the inside during lining (inner side of the tunnel), and a water stop agent injection plug 10'' is attached to the inner end of this hole. In addition, by installing water-stop caps similar to those attached to the steel segments mentioned above to the backfill material injection ports (not shown) installed at appropriate locations, it is possible to achieve the intended purpose even when made of concrete. can be achieved.

In addition, if the above-mentioned steel segment is used with an inclined surface forming part formed at the flange end, it is possible to form a groove when welding together with the adjacent flange, so the lining ring can be connected and fixed by welding. work can be carried out reliably, helping to reduce the impact on the lining section due to the propulsive force of the shield machine, and also reducing the impact on the segment by securing the slide form to a steady rest in the tunnel during secondary lining work. This is effective because the load can be applied to adjacent segments as well.

Furthermore, for the formation of the structural part of the flange part or the inclined surface that can obtain such an effect, it is useful to reduce manufacturing costs by using a flat steel with desired grooves etc. formed during rolling. .

[Brief explanation of drawings]

Figure 1 is a perspective view of an embodiment of the steel lining ring segment of the present invention, Figure 2 is a cross-sectional view of the main part of the ring segment shown in Figure 1, and Figure 3 is a backfill material with a water-stop cap attached. Figure 4 is a detailed cross-sectional view of the inlet, Figure 4 is a cross-sectional view of the flange when an inclined surface is attached, Figure 5 is a diagram showing the operation mode when water is stopped, and Figure 6 is a cross-sectional view of the main part of the concrete segment. be. 1... Lining ring segment, 2, 3...
Flange, 4...Segment top plate, 5...Flange end face, 7, 7a...Waterstop agent filling port, 6, 6',
6a, 6b... Groove for gasket installation, 10, 1
0', 10''...Water stop agent injection plug, 9...Gasket, 15...Backfilling material injection port, 11...Connecting pipe,
20...Water stop cap, 14...Slanted surface, 21...
...Cap body.

Claims (1)

[Scope of utility model registration request] Gasket mounting grooves are provided at appropriate locations on the outer and inner surfaces of the segments on at least two adjacent joining surfaces of the joint during assembly, and a water stop agent of an appropriate size is placed between the two gasket mounting grooves. A filling groove is carved, and the water stop agent filling groove is connected to a water stop agent injection plug with a built-in check valve installed at a suitable place inside the segment with a conduction hole. A ring segment for tunnel lining, characterized by having a chemical injection plug installed in the center of the top and a water-stop cap whose inside is covered with a material to prevent foreign matter from entering.