JPH02272193A - Method and device for arriving at shield tunnel - Google Patents

Abstract

PURPOSE:To facilitate execution by providing a receiving at an arriving position of a shaft in advance, stopping a shield machine driving forward in the ground in the vicinity of the receiving device, and connecting the shield machine to the receiving device. CONSTITUTION:A receiving device B is installed at an arriving position A1 of an arriving shaft A. After that, excavated earth is taken in a skin plate 1 while excavating the ground G by a cutter device 5 of a shield machine S and, at the same time, reaction force is applied to a segment 11 to excavate in the ground G. Then, the shield machine S is stopped in front of the receiving device B, and a cutter spoke is housed in the cutter device 5 by a expansion jack. The cutter device 5 is housed inside a penetration room 2 of the shield machine S by a cutter slide jack. In addition, a penetration ring 3 is pushed out to the receiving device B side by an extrusion jack, and the end of the ring 3 is brought into contact with a pressure receiving rubber ring 18.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention provides a method and device for reaching a shield tunnel that allows a shield machine to reach a shaft mechanically without performing ground improvement such as chemical injection. It is related to.

[Conventional technology and its problems] Conventionally, this type of shield tunnel has been reached through ground improvement methods such as injection of chemicals, underground piles, and freezing methods into the reach area of the shaft (outside the reach shaft). This allowed the ground to become self-supporting, and after opening an access port, the shield machine was able to reach it.

However, with the method of ground improvement as described above, the ground improvement is often incomplete, and water intrudes and soil flows out with the water, resulting in the need to redo the ground improvement. Something terrible is happening. In recent years, shield tunnels have become increasingly larger in diameter and deeper, so the work to remove the access port is taking a long time.
One issue was that it was becoming difficult to keep the ground independent for long periods of time.

The present invention has been made in view of the above problems, and has a large diameter,
It is an object of the present invention to provide a method for reaching a shield tunnel and an apparatus therefor, by which a shield tunnel machine can reach a shaft even at great depth without making the ground self-supporting by improving the ground.

The method of the present invention involves cutting the ground with a cutter device provided at the front part of a cylindrical skin plate, and then taking the cut earth and sand into the skin plate. This is a method of reaching a shaft installed at a predetermined location by a shield excavator that excavates through the ground by taking a reaction force on segments assembled at the rear of the shaft. a second skin plate;
A receiving device is installed that includes a bulkhead that is provided inside the second skin plate and serves as the wall of the shaft, and a pressure receiving ring that is provided on the outer periphery of the second skin plate and serves as the joint with the shield machine. Then, the shield machine propelled through the ground is stopped near these receiving devices, and then, after these shield machines and receiving devices are joined, the inside of the first skin plate and the inside of the second skin plate are removed. The apparatus of the present invention is characterized in that the apparatus disassembles the first skin plate, and the apparatus is arranged along the front inner peripheral surface of the first skin plate and moves in the direction of movement of the first skin plate by a first propulsion jack. A penetrating ring that protrudes and moves is provided, and a first
A shield machine is provided with a cutter spoke that is extendable and retractable along the direction of force of the skin plate, and a cutter slide jack that pulls the entire cutter device into the first skin plate, and the shield is installed on the reaching side of the shaft. A receiving device includes a pressure receiving ring that receives the penetrating ring of the machine when it protrudes, the pressure receiving ring is held by the second skin plate, and the inside of the second skin plate is covered with a bulkhead. The configuration is as follows.

Further, a shield machine is provided with a cutter spoke that is extendable and retractable along the radial direction of the first skin plate on the outer peripheral part of the cutter device, and a second skin plate that is connected to the first skin plate on the reaching side of the shaft. a skin plate is provided, and a bulkhead for supporting earth water pressure is provided inside the second skin plate 1, and the first skin plate;
・A receiving device is provided with a pressure receiving ring that comes into contact with the pressure receiving ring and a second propulsion jack that moves the pressure receiving ring and the bulkhead in the longitudinal direction along the inner circumferential surface of the second skin plate. .

"Function" According to the shield tunnel reaching method of the present invention, since the first skin plate and the second skin plate 1 of the shield machine are joined via the pressure receiving ring, soil and water pressure acting on the joint part is received by the first and second skin plates, and water is stopped by the connection between the first skin plate and the pressure receiving ring. In this state, the interior of the shield machine, such as the cutter device and its drive source, etc. Also, by dismantling the bulkhead of the second skin plate, it is possible to penetrate the shield tunnel and the shaft.

According to the shield tunnel reaching device, the shield machine is stopped just before the receiving device, the cutter spoke is contracted in the radial direction of the first skin plate, and the cutter spoke is housed in the cutter device, and then the cutter device itself is By pulling the cutter device into the inside of the first skin plate, the cutter device is stored inside the skin plate, and in this state, by protruding the penetrating ring toward the distal end side of the first skin plate, the pressure of the second skin plate is reduced. The cutter spoke may be brought into contact with the ring, thereby joining the shielding machine and the receiving device, and the shielding machine may be stopped slightly in front of the receiving device, and the cutter spokes may be retracted in the radial direction of the first skin plate. After storing it in the cutter device, by driving the second propulsion jack of the receiving device, the pressure receiving ring and the bulkhead are moved toward the shield machine side, and the pressure receiving ring is further moved toward the shield machine side. , the pressure receiving ring may come into contact with a first skin plate of the shield machine, and the first skin plate and the second skin plate may be joined.

"Example" The present invention will be described below with reference to the drawings.

1 to 6 show a first embodiment of the shield tunnel reaching method and apparatus of the present invention, and FIGS. 7 to 12 show a second embodiment.

First, the outline of the present invention will be explained using FIG. 3. Reference numeral G in the figure represents the ground. A reaching shaft A is excavated in the ground G, a receiving device B is installed at the reaching entrance A1 of the reaching shaft, and a shield machine S is digging through the ground G toward the receiving device B.

Next, the shield machine S used in this embodiment will be explained using FIG.

The shield machine S is provided with a cylindrical skin plate (first skin plate 1) 1, and a penetration chamber 2 is provided on the inner peripheral surface of the tip of the skin plate 1. The penetration chamber 2 is provided with a cylindrical plate along the inner circumferential surface of the skin plate to give the skin plate a double structure, and a penetration ring 3 that protrudes in the longitudinal direction of the skin plate is provided inside the penetration chamber 2. A punching jack 4 is provided at the rear of the penetrating ring 3 for projecting the penetrating ring 3 from the tip of the skin plate 1 into the receiving device.

Next, a cutter device 5 is attached to the tip of the skin plate 1.
The cutter device 5 is provided with a cutter spoke 6 which is extendable and retractable along the radial direction of the skin plate 1 inside the cutter device 5. The length is such that it expands and contracts between the outer circumferential surface of the skin plate 1 and slightly inside the inner circumferential surface of the penetration chamber. This allows the ground G to be cut to a width that matches the outer circumference of the skin plate 1 during normal excavation, and also prevents the penetration ring from coming into contact with the cutting blade when pushing out the penetration ring 3, which will be described later. This is to do so. Further, the cutter device 5 is provided with a cutter slide jack 8 on its rear side for storing the entire cutter device 5 inside the penetration chamber 2 of the shielding machine.

Furthermore, the reference numeral 9 in the figure is a cutter drive hydraulic motor as a drive source for rotating the cutter, and the reference numeral 10 is a cutter drive hydraulic motor for propelling the shield machine in the ground by taking a reaction force to the segment 11 assembled at the rear of the skin plate 1. This is a propulsion jack (first propulsion jack), and the propulsion jack 10 and the push-out jack 4 are provided alternately at predetermined intervals along the circumferential direction of the skin plate. Further, a tail packing (not shown) is provided between the skin plate 1 and the segment 11. Further, reference numeral 12 is a bulkhead of the shield machine.

Next, the receiving device B will be explained using FIG. 2. In the figure, reference numeral 15 is a skin plate (second skin plate), which is formed into a cylindrical shape with approximately the same dimensions as the first skin plate. . Inside the skin plate, an inner plate 1 is disposed along the inner circumferential surface of the skin plate.
6 forms a cylindrical space 17 (formed with a width slightly wider than the penetration chamber), and a pressure receiving rubber ring 18 is mounted inside the space 17. This pressure receiving ring 18 is made movable in the space in the longitudinal direction of the spring by a single spring, which reduces the impact when the penetrating ring of the shielding machine contacts the pressure receiving rubber ring, and also reduces the impact between the penetrating ring and the pressure receiving rubber ring. It is designed to improve the adhesion with the ring. Furthermore, a bulkhead 20 is provided inside the skin plate 15,
This bulkhead 20 is configured to support earth water pressure until the shield machine reaches the shaft.

Next, a method of reaching the shield tunnel of this embodiment using the apparatus configured as described above will be explained using FIGS. 3 to 6.

1) First, as shown in Figures 3 and 4, reach vertical shaft A.
The access point A1 side is double-closed by temporary sheet pile Y. Part of the wall W of the main shaft is removed in order to install receiving device B of the shield machine, and after installing receiving device B, temporary sheet pile Y is installed. The space between Y and Y will be backfilled with earth and sand, and the temporary steel sheet pile Y will be pulled out and removed. Therefore, a receiving device is installed on the access side wall of the main establishment shaft, and the surrounding soil and water pressure are supported by the second skin plate and bulkhead 20 of the receiving device.

On the other hand, the shield machine S cuts the ground G with the cutter device 5 and takes the cut earth and sand into the skin plate 1, and at the same time takes a reaction force into the segments 11 assembled at the rear of the skin plate 1 to cut into the ground G. Dig deeper.

(11) Next, as shown in FIG.
The cutter spoke is then stopped at , and the cutter spoke is housed inside the cutter device 5 by the telescopic jack 7.

(iii) Next, as shown in FIG. 6, the force/pull device 5 is housed inside the penetration chamber 2 of the shield machine 1 by the force/pull slide jack 8, and in this state, the penetration ring 3 is inserted. It is pushed out toward the receiving device by the extrusion jack 4, and the tip of the penetration ring 3 is brought into contact with the pressure-receiving rubber ring 18 in the receiving device. In this state, the penetrating ring 3
The tips of the pressure-receiving rubber link river 8 and the pressure-receiving rubber link river 8 are brought into contact with each other, and water can be stopped from flowing from the joint.

(1v) Thus, the first. Second skin play]
・After the earth water pressure acting from the ground is cut off by the penetration ring 3 and the pressure-receiving COMLINK 8, the cutter device, force/tutter drive motor, partition plate, etc. in the shield machine are dismantled, and the receiving device is removed. The tunnel is penetrated by dismantling the bulkhead etc.

As described above, according to the method and apparatus of this embodiment, the first skin plate 1 of the shield machine and the second skin plate 15 of the receiving device B are joined via the penetration ring 3 and the pressure receiving ring 18. The soil and water pressure acting from the ground is received by the first and second skin plates, and the water is stopped by the connection between the penetration ring 3 and the pressure receiving ring 18. In this state, the inside of the shielding machine (cutter By dismantling the equipment, its drive source, etc.) and the inside of the second skin plate (bulkhead, etc.), it is possible to penetrate the shield tunnel and shaft, even if the tunnel is large in diameter and at great depth. The shield machine can reach the shaft without the need to improve the ground and make it self-supporting. This allows operations such as dismantling the shield machine and removing rear equipment safely and quickly.

Next, using FIGS. 7 to 12, the second embodiment of the present invention will be described.
The shield tunnel reaching method and apparatus of the embodiment will be described. In the second embodiment, elements common to those shown in the first embodiment are given the same reference numerals.

First, the shield machine S of this embodiment will be explained using FIG. 7. The shield machine S of this embodiment is skin play 1.
-1 is provided with a cutter device 5 at the front thereof, and inside the cutter device 5 is provided a cutter spoke 6 which is extendable and retractable along the radial direction of the skin plate. This cutter spoke 6 is driven by a telescopic jack 7, and when the shield machine is normally excavating, it is protruded to approximately the same length as the outer circumference of the skin plate 1, excavates the ground, and connects with the receiving device. Skin plate l when connected
It is designed to be stored inside.

In the figure, numeral 12 is a partition plate, and numeral 10 is a bolt that propels the shield machine by taking a reaction force from the segment 11 assembled at the rear of the skin plate.

Next, the receiving device used in this embodiment will be explained using FIG. 8.

The receiving device B is installed on the reaching side of the shaft A, and its outer periphery is covered with a second skin plate 15. The outer diameter of the second skin plate 15 is slightly larger than the outer diameter of the first skin plate 1 of the shield machine.
In this embodiment, it is formed to be larger (several cm). Inside the second skin plate 15, there is a pressure receiving rubber ring 18 which is formed in a ring shape and shuts off water by contact pressure with the penetrating ring, and a ring-shaped inner plate 16 made of steel that supports the pressure receiving rubber ring 18. A bulkhead 20 is provided between the inner plates 16 to support earth water pressure, and the pressure receiving rubber ring 18 is movable along the axial direction of the second skin plate 15 by a penetrating extrusion jack 18a. Further, a propulsion jack (second propulsion jack) 21 is provided for advancing the entire receiving device toward the approaching shield machine.

Next, a second embodiment of a shield tunnel reaching method using the apparatus configured as described above will be described with reference to FIGS. 9 to 12.

(1) First, as shown in Figures 9 and 10, the entrance Al side of the arrival shaft A is double closed with a temporary sheet pile Y, and the wall W of the permanent shaft is installed with a pressure receiving device B. After the pressure receiving device B is installed, the space between the steel sheet pile Y and the temporary steel sheet pile Y is backfilled with earth and sand, and the temporary steel sheet pile Y is pulled out and removed. Therefore, a receiving device is installed on the access side wall of the main building, and the second skin plate and bulkhead of the receiving device support the surrounding soil and water pressure.

On the other hand, the shield machine S cuts the ground G with the cutter device 5 and takes the cut earth and sand into the skin plate 1, and at the same time takes a reaction force into the segments 11 assembled at the rear of the skin plate 1 to cut into the ground G. Make it dig.

(11) Next, as shown in FIG. The spokes 6 are reduced to the inside of the penetration chamber 2.

(iii) Next, as shown in FIG. 12, by driving the propulsion jack (second propulsion jack) 21 of the receiving device, the receiving device B is advanced toward the stopped shield machine. At the same time, the pressure-receiving rubber ring 18 is penetrated by the penetration extrusion jack 18a at the pressure set in the shield machine, and the reaching is completed.

In this state, the pressure-receiving rubber ring and the tip of the first skin plate 1 are butted against each other, and water can be stopped from flowing from the joint.

(iv) In this way, the first. After the earth water pressure is blocked by the second skin plate and the pressure-receiving rubber ring, the cutter device, cutter drive motor, partition plate, etc. inside the shield machine are dismantled, and the bulkhead of the receiving device is dismantled to create a tunnel. penetrate.

Therefore, the shield tunnel reaching method of the second embodiment has the same effect as the first embodiment, namely, the earth water pressure is dealt with by the first and second skin plates, Water stoppage is achieved by the contact pressure between the first skin plate and the pressure-receiving rubber ring. This allows operations such as dismantling the shield machine and removing rear equipment safely and quickly.

Furthermore, when the pressure receiving device moves forward, the earth and sand between it and the shield machine is removed while managing the pressure on the shield machine side.

"Effects of the Invention" As explained above, according to the shield tunnel reaching method of the present invention, the first skin plate and the second skin plate of the shield machine
Since the skin plates are joined via the pressure receiving ring, the soil and water pressure acting on the joint is received by the first and second skin plates, and the pressure is stopped by the connection between the first skin plate and the pressure ring. In this state, the interior of the shield machine, such as the cutter device and its drive source, as well as the bulkhead of the second skin plate, etc., are dismantled to penetrate the shield tunnel and the shaft. The first and second skin plates respond to soil water pressure, and the contact pressure between the first skin plate and the pressure-receiving rubber tongue is used to stop water. The shield machine can reach the shaft without the need for ground improvement to make it self-supporting.

This allows operations such as dismantling the shield machine and removing rear equipment safely and quickly.

Further, according to the shield tunnel reaching device, the shield machine is stopped just before the receiving device, the cutter spoke is contracted in the radial direction of the first skin plate, and the cutter device itself is moved after being stored in the cutter device. By pulling the cutter device into the inside of the first skin plate, the cutter device is stored inside the skin plate, and in this state, by protruding the penetrating ring toward the distal end side of the first skin plate, the pressure of the second skin plate is reduced. Since the ring is brought into contact with the shielding device and the receiving device are thereby connected, the penetrating ring can be reliably pressed against the pressure receiving ring, and thereby water can be almost completely stopped. Even if the tunnel is large in diameter and at great depth, the shield machine can reach the shaft without the need to improve the ground and make it self-supporting, making it possible to complete the shield tunnel.

In addition, the shield machine is stopped just before the receiving device, the cutter spokes are compressed in the radial direction of the first skin plate, and the cutter spokes are stored in the cutter device, and then the second propulsion jack of the receiving device is driven. By moving the ring and bulkhead to the 7-board machine side and further moving the pressure receiving ring to the shield machine side, the pressure receiving ring comes into contact with the first skin plate of the shield machine, and the first skin plate Since the first skin plate and the second skin plate are connected to each other, it is possible to almost certainly stop water, and even in large diameter and deep areas, the ground can be improved and made to stand on its own. This has the effect of allowing the shield machine to reach the shaft without the need for it and completing the shield tunnel.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a side sectional view of the shield machine, FIG. 2 is a side sectional view of the receiving device, and FIGS. 3 to 6 is a diagram for explaining the arrival method of the first embodiment, FIG. 3 is a side sectional view of the shield machine propelled toward the shaft in which the receiving device is attached, and FIG. 4 is a plan view of the shield machine in FIG. 5 is a side sectional view of the shield machine in a stopped state approaching the shaft, FIG. 6 is a side sectional view of the shield machine in a state where the receiving device of the shaft and the shield machine are joined, and FIGS. Fig. 12 shows a second embodiment of the present invention, Fig. 7 is a side sectional view of the shield machine, Fig. 8 is a side sectional view of the receiving device, and Figs. 9 to 12 show the second embodiment. FIG. 9 is a side sectional view of the shield machine propelled toward the shaft where the receiving device is attached, FIG.
FIG. 1 is a sectional side view of the shielding machine in a state where it approaches the shaft and is stopped, and FIG. 12 is a side sectional view of the state in which the receiving device of the shaft and the shielding machine are joined. G...Ground, A...Shaft, B...Acceptance device, S shield machine, ■...Skin play 1- ('41 skin play 1), 2...Penetration room, 3 - Penetration link, 5
... Cutter device, 6 ... Cutter spoke,
8... cutter slide jack, 10 propulsion jack, jl...segment l-115 skin play 1
- (12 skin plates), 18 pressure receiving comb ring (pressure receiving ring), 2o...hulk head, 21...propulsion jack.

Claims (3)

[Claims] (1) While cutting the ground with a cutter device installed at the front of the cylindrical skin plate, the cut earth and sand is taken into the skin plate, and the reaction force is taken by the segments assembled at the rear of the skin plate to cut the ground. A method of reaching a shaft provided at a predetermined location with a shield excavator that excavates inside, the method comprising: first installing a second skin plate on the reaching surface side of the shaft; A receiving device is installed that includes a bulkhead that is provided inside and serves as the wall of the shaft, and a pressure receiving ring that is provided on the outer periphery of the second skin plate and serves as a joint with the shield machine. The shield machine that propels the inside is stopped near these receiving devices, and then, after these shield machines and the receiving device are joined, the inside of the first skin plate and the inside of the second skin plate are dismantled. How to reach the shield tunnel. (2) A device used in the method for reaching a shield tunnel according to claim 1, wherein the device is disposed along the front inner circumferential surface of the first skin plate, and is arranged by a first propulsion jack to A penetrating ring that protrudes and moves in the direction of movement of the skin plate is provided, and a cutter spoke that is extendable and retractable along the radial direction of the first skin plate is provided on the outer periphery of the cutter device.
A shield machine is provided with a cutter slide jack that is pulled into the skin plate of the shield machine, and a pressure receiving ring is provided on the reach side of the shaft to receive the penetrating ring of the shield machine when it protrudes, and the pressure receiving ring is connected to the second skin plate. A receiving device for a shield tunnel, comprising: a receiving device held by a skin plate and having the inside of the second skin plate covered by a bulkhead. (3) A device used in the method for reaching a shield tunnel according to claim 1, wherein a cutter spoke is provided on the outer periphery of the cutter device and is extendable and retractable along the radial direction of the first skin plate. A second skin plate joined to the first skin plate is provided on the reaching side of the shaft, and a bulkhead for supporting earth water pressure is provided inside the second skin plate, and a bulkhead is provided inside the second skin plate to support the earth water pressure. a receiving device provided with a pressure receiving ring that comes into contact with the skin plate, and a second propulsion jack that moves the pressure receiving ring and the bulkhead in the longitudinal direction along the inner circumferential surface of the second skin plate. A shield tunnel reaching device featuring: