JPS6367395A - Cut-off method of joining section of underground joining type shielding machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is an underground joint type used in an underground joint construction method in which a tunnel to be constructed is excavated from both sides by a shield machine and joined in the middle. This article relates to a method for stopping water at joints in shield machines.

``Prior Art'' The present applicant has proposed an underground bonding method for shield tunnels as shown in FIGS. issue)
provided.

In the figure, the symbol G is the ground near the junction of the shield tunnel, and within this ground G, the first shield machine l
excavates the first tunnel Ta using the cutter device 10,
Further, the second shield machine 2 is excavating the tunnel Tb using the cutter device 20. The wall surface of tunnel Ta is primarily lined with segments 3a, 3a, . . . , and the wall surface of tunnel Tb is lined with segments 3b, 3.
The primary lining is being carried out by b, .

The first shield machine 1 is provided with a cylindrical skin plate 1a, whose tip 1b is connected to an outer cylinder 1.
1 and an inner cylinder 12, and a penetrating ring 13 is housed between them. and an extrusion jack 14.14 in the circumferential direction of the rear part of the penetrating ring 13;
A plurality of propulsion jacks 15, 15,... are attached to the rear thereof in the circumferential direction, and are in contact with the side surface of the segment 3a. The cutter device 1O is formed to have a slightly smaller diameter than the inner cylinder 12, and its shaft body 16 is pivotally supported by a partition plate 17. A cutter portion 10a is provided. Second
The shield machine 2 is provided with a skin plate 2a formed in a cylindrical shape with the same diameter as the first skin plate la,
The tip part 2b is similar to the first shield machine l,
By forming the outer cylinder 21 and the inner cylinder 22 in a double layer, it becomes a penetration chamber R into which the penetration ring 13 penetrates. A partition plate 27 is fixed inside the inner cylinder 22, and a plurality of propulsion jacks 25, 25, . . . are attached to the rear of the outer cylinder 21 along the circumferential direction. is in contact with the side surface of segment 3b. Further, the cutter device 20 includes a cutter portion 20a and a shaft body 26 configured similarly to the cutter device IO.

First, as shown in FIG. 4, the ground G is excavated using the first shield machine 1, and segments 3a, 3
A, . Then, as shown in Fig. 5, the first shield machine 1 and the second shield machine 2 were made to face each other at the junction of the tunnel, leaving a predetermined length of ground Gi (approximately 30 cm to 11 cm). After that, the cutter portion 10a at the tip of the cutter device 10.20,
20a is shortened. Next, as shown in FIG.
The extrusion jack 14 of the shielding machine 1 is driven to slide until the tip of the penetration ring 13 is inserted into the penetration chamber R formed by the outer cylinder 21 and the inner cylinder 22 of the second shielding machine 2. In particular, the first shield machine 1 with the penetrating ring 13
The ground Gi remaining at the tunnel junction between the shield machine 2 and the second shield machine 2 is covered.

Therefore, in this construction method, the penetration ring 1 is placed in the penetration chamber R.
3, it is possible to cover the ground Gi at the joint, ensure earth retaining and water supply at the joint, shorten the construction period and reduce construction costs without using auxiliary construction methods such as the conventional freezing construction method. It is possible to achieve this goal.

However, in the above construction method, since earth, sand, gravel, etc. enter into the penetration chamber R of the second shield machine 2 during excavation, the penetration ring 13 is penetrated into the penetration chamber R when the shield machine 1.2 is joined. In this case, there was a problem in that the penetration ring 13 did not enter smoothly due to obstacles such as dirt and gravel.

Therefore, in order to solve the above-mentioned problem, the present applicant installed a pressure receiving ring 30 in the second shielding machine 2, which is movable back and forth in the penetration chamber R along the excavation direction of the shielding machine, as shown in FIG. and a drive device 31 that drives this via a rod 30a, and when joining the shield machine 1.2, the pressure ring 30 pushes out dirt, gravel, etc. that have blocked the inside of the penetration chamber R. After securing space in the penetration chamber R,
The penetration ring 13 is configured to penetrate into the penetration chamber R.

"Problems to be Solved by the Invention" However, in the above-mentioned underground joining method, when the shield machines join, there is a misalignment between the axes of the shield machines 1 and 2,
A new problem has arisen in that if the pressure receiving ring 30 is made of copper, it may come into point contact with the penetrating ring 13 in the event of a break or the like, which may reduce the water-stopping performance.

The present invention has been made in view of the above-mentioned problems, and even if a misalignment or bending occurs between the axes of the shield machine when joining the shield machines, the tips of the pressure receiving ring and the penetrating ring can be fixed. It is an object of the present invention to provide a water supply method for a joint part of an underground joint type shield machine, which has a large water-stopping effect by closely contacting the whole circumference.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides a ring-shaped hollow elastic member inside the penetration chamber,
When the penetration ring penetrates into the penetration chamber, the hollow elastic member is expanded by pumping fluid such as air, water, oil, etc. into the hollow elastic member, and the expanded hollow elastic member is used as the tip of the penetration ring. It is characterized by being in close contact with the entire circumference of the part.

``Example'' Hereinafter, an example of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of the present invention, and are enlarged sectional views of the penetration chamber portion of the shielding machine shown in the prior art. In these figures, the same elements as those shown in the prior art shown in FIGS. 4 to 7 are designated by the same reference numerals, and the explanation thereof will be omitted.

First, to explain FIGS. 1(a) and 1(b), an outer cylinder 21
The penetration chamber R is an annular space formed by the inner cylinder 22 and the inner cylinder 22.
A pressure receiving ring 30 is formed in this penetration chamber R.
The pressure receiving ring 30 is attached to a jack 31 fixed to the outside of the penetration chamber R via rods 30a, 30a, . . . provided at predetermined intervals in the circumferential direction. The pressure receiving ring 30 is made of wt fiber-reinforced hard rubber and has a tube shape, and
It consists of a hollow elastic member 32 formed in a ring shape along the circumferential direction of the inner wall of the hollow elastic member 32, and a steel reinforcing ring 33 with a U-shaped cross section fixed to the back surface of the hollow elastic member 32.
By fixing the tip of the rod 30a to the reinforcing ring 33, the hollow portion 32a formed inside the hollow elastic member 32 is inserted into the rod 30a through the hole 33a formed at a predetermined position of the reinforcing ring 33. 30a is configured to communicate with a fluid flow path 30b formed inside.

When joining the shield machines 1 and 2, as shown in FIG. 1(b), the hollow elastic member 3 of the pressure receiving ring 30
While the hollow elastic member 32 is expanded by pumping fluid such as air, water, or oil into the inside of the penetration chamber R through the rod 30a, the pressure receiving ring 30 is moved to remove dirt and gravel from the penetration chamber R. After being discharged to the outside, the penetration ring 13 of the shield machine I is penetrated into the penetration chamber R, and then the hollow elastic member 32 is brought into pressure contact with the tip of the penetration ring 13.

As a result, even if the axes of the shielding machine 1.2 are misaligned or bent, the hollow elastic member 32 made of hard rubber will remain at the tip of the penetrating ring 13 of the shielding machine 1 and over the entire circumference. It fits tightly without any gaps, increasing the water-stopping effect. Furthermore, the penetrating ring 13 and the hollow elastic member 3
By increasing the pressure within the hollow elastic member I3 in a state in which they are in pressure contact with each other, the contact pressure can be increased and a greater water-stopping effect can be obtained.

Next, a second embodiment will be described using FIG. 2. Figures 2 (a) and (b) show the cross-sectional structure of the penetration chamber R of the shield machine 2. Inside the penetration chamber R, there is a tube-shaped structure made of the fiber-reinforced hard rubber used in the first embodiment. At the same time, by fitting a plurality of hollow elastic members 32, 32, etc. formed in a ring shape along the penetration chamber R (four in this embodiment), the inside of the penetration chamber R is completely covered. It is in a closed state. And each hollow elastic member 3
2.32. ... has hollow parts 32a, 32a inside thereof.
Conduit 3 for pressure-feeding fluids such as air, water, oil, etc. to...
4,34. It has a configuration in which...

In this embodiment, while the shield machine 2 is digging, the pressure ring 32 can prevent dirt, gravel, etc. from entering the penetration chamber R, and the shield machines 1 and 2 can be joined together. In this case, as shown in FIG. 2(B), the fluid is pumped into the hollow elastic members 32, 32, . . . and the pressure receiving rings 32, 32, . With ... inflated,
The penetration ring 13 of the shield machine I is penetrated into the penetration chamber R and brought into pressure contact with the tip of the pressure receiving ring 32.

As a result, the same functions and effects as in the first embodiment can be obtained.

Next, a third embodiment will be described using FIG. 3. In the third embodiment, as in the second embodiment, two hollow elastic members 32 and 32 are disposed at the back of the penetration chamber R, and the front end portions of the hollow elastic members 32 and 32 are located inside the penetration chamber R. A water stop brush 35 is attached which extends toward the penetrating chamber R and is formed in an annular shape along the inner wall of the penetration chamber R.
The inner space 5 is filled with room-temperature mixture material or sand with small particle size. The hollow elastic member 32.32 is provided with a conduit 34.34 for pumping fluid such as air, water, oil, etc.
The clean water brush 35 at the front thereof has a chemical solution injection pipe 36 that communicates with its inner surface.

In this embodiment, when joining the shield machine 1 and 2, the penetration ring 13 of the shield machine 1 is inserted into the penetration chamber R.
The hollow elastic member 32 of the shielding machine 2
．． After expanding the hollow elastic member 32 by force-feeding the fluid to the hollow part 32a in the brush 32, a chemical solution is injected into the inner surface of the water-stopping brush 35 from the chemical injection pipe 36, and the room-temperature mixture and sand 37 are solidified. .

As a result, this embodiment has the same functions and effects as the second embodiment, and in the water stop brush 65 part, the gap between the water stop brush 35 and the penetration ring 13 is made of solidified room temperature mixture. It is sealed with sand 37 and has a more complete water-stopping effect.

"Effects of the Invention" As explained above, the present invention provides a hollow elastic member formed in a ring shape inside the penetration chamber of a shield machine in the underground bonding method, and when the penetration ring penetrates into the penetration chamber. The hollow elastic member is expanded by pumping fluid such as air, water, oil, etc. into the hollow elastic member, and the expanded hollow elastic member is brought into close contact with the entire circumference of the tip of the penetrating ring. As a result, even if there is a misalignment or breakage between the axes of the shield machine, the hollow elastic member and the tip of the penetrating ring can be brought into close contact over the entire circumference, resulting in a high A water-stopping effect can be obtained.Furthermore, by increasing the pressure of the fluid inside the hollow elastic member, the contact pressure with the penetrating ring can be increased, and greater water-stopping performance can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 show a method for stopping water at the joint of the underground joint type shield machine of the present invention, and Figures 1 (a) and (b) show the first embodiment, and the shield machine 2(a) and 2(b) are enlarged sectional views of a portion of the penetration chamber of the shield machine, and FIGS. 3(a) and 3(b) are sectional views of the second embodiment. ) shows the third embodiment, and is an enlarged sectional view of a part of the penetration chamber of the shield machine, and FIGS. 4 to 7 are views showing the conventional technology, and FIG. FIG. 5 is a side sectional view of the first and second shield machines with the cutter device reduced before joining, and FIG. 6 is a side sectional view of the first and second shield machines for drilling A side sectional view of the shield machine showing the state in which it has penetrated into the penetration chamber,
FIG. 7 is a cross-sectional view of the vicinity of the joint of the shield machine, showing a state in which the pressure receiving ring provided in the penetration chamber is pressed against the tip of the penetration ring. G...Ground, Gi...Tunnel junction ground, 1...First shield machine, 2...
・Second shield machine, la, 2a...skin plate, lb, 2b...skin plate tip, 11.21...outer cylinder, 12.22... - Inner cylinder, 13...Penetration ring, R...Penetration chamber, 32...Hollow elastic member.

Claims (1)

[Claims] A first shielding device in which a tip end of a skin plate is formed double by an outer cylinder and an inner cylinder, and a penetration ring is housed between the outer cylinder and the inner cylinder, and a tip part of the skin plate. and a second shield machine which is formed in double form by an outer cylinder and an inner cylinder having the same diameter as the first shield machine, thereby forming a penetration chamber into which the penetration ring is penetrated.
A method for stopping water at a joint of an underground joint type shield machine in which a tunnel is excavated from both sides as a set and joined in the middle, the method comprising providing a hollow elastic member formed in a ring shape inside the penetration chamber. When the penetration ring penetrates into the penetration chamber, the hollow elastic member is expanded by pumping fluid such as air, water, oil, etc. into the hollow elastic member, and the expanded hollow elastic member is transferred to the penetration ring. A method for stopping water at a joint of an underground joint type shield machine, characterized by closely contacting the entire circumference of the tip of the shield machine.