JPH03244793A - Shield excavator equipped with tall seal part emergency cut-off device and method for exchanging the same tall seal - Google Patents

Abstract

PURPOSE:To cope with a deluge occurring due to the damage of a tail seal by mounting a hollow seal for emergency cut-off on the inner peripheral part of a tail plate or a tail seal mounting plate, and forming an extension part for cut-off on the vertical shaft side. CONSTITUTION:A hollow seal 14 for emergency out-off is positioned closer to a position on the facing side than a tail seal 8 and mounted on the inner peripheral part of a tail plate 2 of which a shield jack 6 is in short even when the sealed jack is stretched to a full stroke. The hollow seal 14 for emergency cut-off is expanded through injection of fluid and brought into contact with the outer peripheral part of a segment 10. After a segment 11 having a hollow seal 17 for exchanging a tail seal is assembled, a shield body 1 is moved forward to a position where the hollow seal 17 is positioned facing an extension part 9a on the vertical shaft side of a tall seal mounting plate 9. After water is stopped between the tail seal 8 and a natural ground 13, a segment 12 is removed to exchange the tail seal 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an emergency water shutoff device for a tail seal part to cope with the case where the tail seal is damaged or worn out during excavation and loses its sealing function. This invention relates to a shield tunneling machine equipped with a shield tunneling machine and a method for replacing its tail seal.

[Conventional technology]

The tail seal, which is installed at the end of the shaft side of the shield excavator and isolates the interior of the machine from the ground by contacting the outer periphery of the segment, may be damaged by foreign objects caught during excavation, and water may suddenly come out. be. Furthermore, if excavation is carried out over a long distance, the tail seal may wear out and lose its sealing function during the course of the excavation, and may have to be replaced.

In such cases, conventional methods have involved injecting a plastically fluid sealing material between the tail seal stages, or using a pump to pump out water that has entered the cabin, while removing water from the ground or on the ground, as shown in Figures 9 and 10. The ground around the tail was hardened by injecting chemicals from underground and using freezing methods, and the tail seal 8 was replaced after the water was stopped.

In FIGS. 9 and 10, 21 indicates a chemical injection pipe or freezing tube, 22 indicates a chemical injection part or frozen part of the earth, and 23 indicates the ground surface.

[Problems to be Solved by the Invention] The above conventional technology uses chemical injection and freezing methods, so it takes many days to achieve a water stop effect and is expensive, especially in deep tunnels, When excavating a ground that contains a high-pressure water layer, such as an undersea tunnel, it is expected that a tail seal will break and a large amount of water will suddenly come out, and the conventional technology described above cannot handle such emergency situations. I can't deal with it.

Some of the inventors of the present application have developed a method for replacing a tail seal that does not involve chemical injection or freezing methods by using a hollow seal called a cut-off bag installed on the inner periphery of the tail plate (or the outer periphery of a segment) between the stages of the tail seal. By inflating the barrier bag by injecting it and bringing it into contact with the outer periphery of the segment (or the inner periphery of the tail plate), the water is cut off between the stages of the tail seal, and the bag is inward of the machine (face side) from the barrier bag. We have previously devised a method for replacing the tail seal (Japanese Patent Application No. 63-260565).

However, with this method, it is not possible to replace the tail seal on the ground side (shaft side) from the isolation bag, especially the tail seal on the last stage on the ground side, which is easily damaged by contact with earth and sand or backfilling material, so the tail seal does not function completely. There is no hope for recovery. In addition, if a cut-off bag is installed on the tail plate side between the tail seal stages to perform an emergency water stop at the tail seal section, the cut-off bag cannot be inspected or replaced, so if water enters between the tail seal stages from the ground side. There is a risk that the isolation bag will be damaged by contact with foreign objects and become useless.

The present invention has been developed in consideration of the above points, and even when the tail seal is damaged during excavation and water suddenly comes out, or when replacing a worn tail seal, it can be done at a lower cost without using chemical injection or freezing methods. Equipped with a highly reliable tail seal emergency water stop device that allows all tail seals to be replaced in a short period of time at a low cost, and that can always ensure emergency water shutoff of the tail seal and water stop when replacing the tail seal. An object of the present invention is to provide a shield tunneling machine and a method for replacing its tail seal.

[Means to solve the problem]

In order to achieve the above object, a shield excavator equipped with the tail seal emergency water supply system according to claim 1 has a structure in which a fluid is provided on the inner circumference of the tail plate or the tail seal mounting plate located on the face side of the tail seal. It is equipped with a hollow seal for emergency water-stopping that expands upon injection and contacts the outer periphery of the segment, and the tail-seal mounting plate is provided with an extension for water-stopping that extends from the tail seal toward the shaft side.

The tail seal replacement method according to claim 2 is a tail seal replacement method when the tail seal is damaged during excavation and water suddenly comes out, and the tail seal is replaced on the inner periphery of the tail plate or the tail seal mounting plate located on the face side of the tail seal. A hollow seal for emergency water shutoff equipped in the tail seal section is expanded by injecting fluid, and the expanded hollow seal is brought into contact with the outer periphery of the segment to perform an emergency water shutoff against water coming out from the tail seal section. a second step of assembling a segment equipped with a hollow seal for replacing the tail seal on the outer periphery at the tail portion on the face side of the hollow seal for emergency water stop; and assembling the segment equipped with the hollow seal for replacing the tail seal. After completion, repeat the excavation and assembly of the subsequent segment as usual, and advance the seal to the position where the hollow seal for tail seal replacement faces the extension of the tail seal mounting plate extending from the tail seal toward the shaft side. In the third step, at this position, the tail seal replacement hollow seal is expanded by injecting fluid, and the expanded hollow seal is brought into contact with the shaft side extension of the tail seal mounting plate, thereby connecting the tail seal to the ground. It consists of a fourth step of shutting off water between the mountain and the fifth step of removing the segment in contact with the tail seal and replacing the tail seal.

The tail seal replacement method according to claim 3 is a method for replacing a tail seal worn out during excavation, wherein a hollow seal for tail seal replacement is provided on the outer periphery of the tail portion on the face side of the emergency water stop hollow seal. After completing the first step of assembling the segment equipped with the hollow seal for replacing the tail seal and assembling the segment equipped with the hollow seal for replacing the tail seal, the excavation and assembly of the subsequent segment are repeated as usual, and the hollow seal for replacing the tail seal is removed from the tail seal in the vertical shaft. a second step of advancing the seal equipment to a position facing the extension of the tail seal mounting plate that extends to the side; and at this position, the hollow seal for tail seal replacement is expanded by injection of fluid, and the expanded hollow seal is expanded. A third step of stopping water between the tail seal and the ground by bringing the seal into contact with the shaft side extension of the tail seal mounting plate, and then removing the segment in contact with the tail seal and removing the tail seal. and a fourth step of exchanging the .

[Effect]

An emergency water stop hollow seal installed on the inner periphery of the tail plate or tail seal mounting plate located on the face side of the tail seal prevents water from flowing out from the tail seal.
Immediately inflates by injecting fluid and contacts the outer periphery of the segment to prevent dirt and groundwater from entering the cabin.

On the other hand, when replacing the tail seal, the hollow seal for tail sill replacement installed on the outer periphery of the segment is expanded by injecting fluid at a position facing the extension of the tail seal mounting plate extending from the tail seal toward the shaft side. It comes into contact with the shaft side extension of the tail seal mounting plate to stop water between the tail seal and the ground.

Therefore, there are two types: one for emergency water stop and one for tail seal replacement.
By using the two hollow seals, you can make an emergency stop of water in the tail seal and replace all the tail seals at any time.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In Figure 1, ■ is equipped with a seal, 2 is a tail plate, 3 is a cutter wheel, 4 is a cutter drive device, 5 is a screw conveyor for soil removal, 6 is a shield jack, 7 is a spreader, 8 is a tail seal, 9 10.1112 indicates a tail seal mounting plate, 10.1112 a segment, and 13 a ground.

In this embodiment, an emergency water stop hollow seal 14 is provided on the inner circumference of the tail plate 2, which is located on the face side of the tail seal 8 and cannot be reached even if the shield jack 6 extends its full stroke. This hollow seal 14 is formed into a continuous tube shape from a rubber-based elastic body, and can be inflated by injecting a fluid such as water.

FIG. 2 is an enlarged view of the emergency water stop hollow seal 14 and its surrounding area, where 15 is a seal holder that identifies the hollow seal 14 to the tail plate 2, and 16 is a pipe for injecting fluid into the hollow seal 14. , are connected to a pump (not shown) through the tail plate 2. The hollow seal 14 is inflated as shown by the two-dot chain line 14' in FIG.
It forms a water stop wall that contacts the outer periphery of the segment 10 and isolates the tail seal 8 from the inside of the machine, and usually the segment 10
Keep it away from wear and tear.

The tail seal 8 is, for example, a brush-shaped seal made of steel, and is installed in four stages between the face side end and the shaft side end of the tail seal mounting plate 9. A water-stopping extension 9a is provided that extends further toward the shaft side than the final stage tail seal.

The hollow seal 17 for tail seal replacement is installed on the outer periphery of the segment 11 used when replacing the tail seal. This hollow seal 17 is also formed into a continuous tube shape from a rubber-based elastic body, and can be inflated by injecting a fluid such as water.

Figures 3 and 4 are enlarged views of the hollow seal 17 for tail seal replacement and its surrounding area, where the hollow seal 17 is segment 1.
When assembling the segment, it is attached from the face side so as to fit into the concave portion 11a of the outer periphery of the segment 1, and is fixed with an adhesive. A pipe 18 for injecting fluid into the hollow seal 17 is connected to a groove 11b provided on the face side end surface of the segment H1.
It is connected to a pump (not shown) through the pipe 18 and the groove 1.
The gap 1b is filled with a sealant having adhesive properties. By inflating the hollow seal 17 as shown by the two-dot chain line 17' in FIG. A watertight wall is constructed in between.

FIG. 5 is an explanatory diagram of a tail seal replacement method in the event that the tail seal is damaged during excavation and water suddenly comes out. This tail seal replacement method consists of the following five steps.

(1) First step: Expand the hollow seal 14 for emergency water shutoff equipped on the inner peripheral part of the tail plate 2 located on the face side of the tail seal 8 by injecting fluid, and expand the expanded hollow seal 14. By contacting the outer peripheral portion of the segment 10, an emergency water stop is performed against water coming out from the tail seal portion (FIG. 5(a)).

(2) Second step: Assemble the segment 11 equipped with the hollow seal 17 for tail seal replacement on the outer periphery using an erector (not shown) at the tail portion on the face side from the hollow seal 14 for emergency water stop. )).

(3) Third step: After completing the assembly of the segment 11, repeat the usual excavation and assembly of the succeeding segment 12,
The seal installation 1 is advanced to a position where the hollow seal 17 installed on the segment 11 faces the shaft side extension 9a of the tail seal mounting plate 9 (FIG. 5(C)).

(4) Fourth step: At this position, the hollow seal 17 installed on the segment 11 is expanded by injecting fluid, and the expanded hollow seal 17 is brought into contact with the shaft side extension 9a of the tail seal mounting plate 9. , water is stopped between the tail seal 8 and the ground 13 (FIG. 5(d)).

(5) Fifth step: After that, the segment 12 in contact with the tail seal 8 is removed and the tail seal 8 is replaced (not shown).

FIG. 6 is an explanatory diagram of a method for replacing a tail seal worn out during excavation, and this tail seal replacement method consists of the following four steps.

The functional deterioration due to wear of the tail seal progresses gradually, so when the amount of water flowing out is small, it can be dealt with by normal pump drainage, and there is no need to perform an emergency water shutoff (Figure 6 (a)).

(l゛) First step: Assemble segment 1, which is equipped with a hollow seal 17 for tail seal replacement on its outer periphery, using an erector (not shown) at the tail portion on the face side of the emergency water stop hollow seal 14 (Fig. 6) (b)).

(2゛) Second step: After completing the assembly of the segment 11, the usual excavation and assembly of the succeeding segment 12 are repeated, and the hollow seal 17 installed in the segment 11 is connected to the shaft side extension 9a of the tail seal mounting plate 9. Move the seal equipped 1 forward to the opposing position. (Figure 6(C)).

(3') Third step: At this position, the hollow seal 17 provided on the segment 11 is expanded by injecting fluid, and the expanded hollow seal 17 is attached to the tail seal mounting plate 9.
By contacting the shaft side extension 9a of the tail seal 8, water is stopped between the tail seal 8 and the ground 13 (Fig. 6 (d)).

(4″) Fourth step: After that, the segment 12 in contact with the tail seal 8 is removed and the tail seal 8 is replaced (not shown).

A second embodiment of the invention is shown in FIG. In this example,
Two hollow seals 17 for tail seal replacement are installed on the outer periphery of the segment 11 used when replacing the tail seal, one on the face side and the other on the shaft side. These hollow seals I7 are attached separately to each segment, and are connected without gaps in the circumferential direction when the segments are assembled. When replacing the tail seals, fluid is injected into the two-stage hollow seals 17 from the piping 18, and the expanded hollow seals 17 are brought into contact with the extensions 9a of the tail seal mounting plate 9, respectively.

If the water leakage cannot be suppressed even after this, the sealing material 20 with plastic fluidity is injected between the two-stage hollow seals 170 from the sealing material injection port 19 of the segment 11 at a pressure higher than the groundwater pressure to completely prevent the water leakage. It can be stopped.

In each of the above embodiments, the shaft side extension 9a of the tail seal mounting plate 9 has the same plate thickness as the tail seal mounting part, but as shown in FIG. 8, the shaft side extension 9a is made double. By increasing the thickness t of this portion, the hollow seal 17 for tail seal replacement can be made smaller.

Although the number of stages of the tail seal 8 is four in the embodiment, it may be any number of stages. Furthermore, the cross-sectional shapes of the hollow seals 14 and 17 are not limited to the illustrated shapes, and may be arbitrary.

The emergency water stop hollow seal 14 is located behind the segment 10 during normal excavation, but it can be sealed over the full stroke of the shield jack 6 by inserting a spacer such as a square lumber between the end face of the segment and the spreader 7. Inspection and replacement can be performed at any time by pushing the equipment 1 and extending the hollow seal 14 from the segment end face to the face side (see Figure 2).

〔Effect of the invention〕

According to the present invention, by inflating the hollow seal for emergency water stop equipped on the inner circumference of the tail plate or the tail seal mounting plate on the face side of the tail seal and bringing it into contact with the outer circumference of the segment, it is possible to prevent damage to the tail seal. You can quickly respond to sudden flooding. In addition, the hollow seal for tail seal replacement installed on the outer periphery of the segment is expanded,
By making contact with the extension of the tail seal mounting plate that extends from the tail seal toward the shaft side, water can be stopped between the tail seal and the ground, making it possible to cut off water at a lower cost and in a shorter time without using chemical injection or freezing methods. All tail seals can be replaced.

In addition, the hollow seal for emergency water stop equipped on the face side of the tail seal extends the propulsion distance of the seal, allowing inspection and replacement at any time. Since the seals are always new, they have high reliability and can reliably stop water.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of a shield tunneling machine equipped with the tail seal emergency water stop device of the present invention, Fig. 2 is an enlarged view of section A in Fig. 1, and Fig. 3 is a view of Fig. 1. Figure 4 is an enlarged view of part B of Figure 3, Figure 5 is an explanatory diagram of how to replace the tail seal in the event that the tail seal is damaged and water suddenly comes out, Figure 6 is a worn tail seal. An explanatory diagram of how to replace the
7 is a side sectional view of the main part of the second embodiment of the present invention, FIG. 8 is a side sectional view of the main part of the third embodiment of the invention, FIG.
FIG. 0 is an explanatory diagram of the prior art. l... Equipped with a seal, 2... Tail plate, 8...
...Tail seal, 9...Tail seal mounting plate, 9a...Shaft side extension of tail seal mounting plate, 10, IL 12...Segment, 14...Hollow seal for emergency water stop, 16. ...Fluid injection piping, 17
...Hollow seal for tail seal replacement, 18...Piping for fluid injection. Figure 2

Claims (1)

[Claims] 1. An emergency water stop hollow that expands when fluid is injected into the inner periphery of the tail plate or tail seal mounting plate of the shield body located on the face side of the tail seal and contacts the outer periphery of the segment. A shield excavator equipped with a tail seal emergency water cutoff device, characterized in that the tail seal mounting plate is provided with a water cutoff extension extending from the tail seal toward the shaft side. 2. A method for replacing a tail seal during excavation of a shield excavator according to claim 1, wherein an emergency stop is provided on the inner periphery of the tail plate of the shield body or the tail seal mounting plate located on the face side of the tail seal. A first step of expanding the water hollow seal by injecting fluid and bringing the expanded hollow seal into contact with the outer periphery of the segment to perform an emergency water stop against water coming out from the tail seal portion; After completing the second step of assembling the segment equipped with the hollow seal for tail seal replacement on the outer periphery at the tail part on the face side of the water hollow seal, and after completing the assembly of the segment equipped with the hollow seal for tail seal replacement, the normal procedure is performed. A third step of repeating the excavation and assembly of the subsequent segment to advance the shield body to a position where the hollow seal for tail seal replacement faces an extension of the tail seal mounting plate extending toward the shaft side from the tail seal; and this position. By inflating the tail seal replacement hollow seal by injecting fluid and bringing the expanded hollow seal into contact with the shaft side extension of the tail seal mounting plate, water is stopped between the tail seal and the ground. and a fifth step of removing the segment in contact with the tail seal and replacing the tail seal. 3. A method for replacing a tail seal during excavation of a shield excavator according to claim 1, wherein the segment is equipped with a hollow seal for tail seal replacement on the outer periphery of the tail portion on the face side of the emergency water stop hollow seal. The first step is to assemble the
After completing the process and assembling the segment equipped with the hollow seal for tail seal replacement, the excavation and assembly of the succeeding segment are repeated as usual, and the tail seal is made such that the hollow seal for tail seal replacement extends toward the shaft side from the tail seal. a second step of advancing the shield body to a position facing the extension of the mounting plate; at this position, the hollow seal for tail seal replacement is inflated by injection of fluid; and the inflated hollow seal is attached to the tail seal mounting plate. A third step of stopping water between the tail seal and the ground by bringing it into contact with the shaft side extension of the tail seal, and a fourth step of removing the segment in contact with the tail seal and replacing the tail seal. Tail seal replacement method consisting of: