JPH04360989A - Method of joining shield machine underground and joining shield machine therefor - Google Patents

Abstract

PURPOSE:To enable and ensure the joining of both shield machines when a tunnel is excavated from opposite directions by two shield machines to pass through the tunnel. CONSTITUTION:Ring-shaped freezing pipes 4 are arranged to the insides of the thick open ends of skin plates 3 of both shield machines 1 and 2 and, at the same time, circular cutter plates 5 arranged to the open ends of the skin plates 3 in a projection state can be moved axially through jacks 20. When tunnels are excavated in mutually approachable directions by both shield machines 1 and 2 to connect the tunnels to each other, both shield machines 1 and 2 are advanced to connect the opposed ends of the skin plates 3 and 3 to each other after the opposed circular cutter plates 5 and 5 are advanced until they are in contact with each other or in a state of approach. The peripheral ground of the Joining section is frozen with refrigerant supplied to the freezing pipes 4.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a method for joining both shield machines to each other at the time of excavating and penetrating a tunnel by making two shield machines excavate in a direction approaching each other, and the implementation of this method. This relates to a shield machine used for.

0002

[Prior Art] Conventionally, when a tunnel is excavated from opposite directions by two shield machines, and the tunnel excavated by these shield machines is penetrated at the middle part of the tunnel, the skin plates of both shield machines are After stopping at opposing positions that are close to each other with a gap, a freezing tube is driven into the ground around the skin plate from within the skin plate, and refrigerant is supplied to the freezing tube to close the opposing skin plates of both shield machines. The method used is to freeze the ground around the skin plate, including the gaps, to prevent underground water from leaking, and then dismantle the shield machine and excavate the unexcavated area.

[0003] Also, while the circular cutter plate of one shield machine is moved backward, the circular cutter plate of the other shield machine is advanced and inserted into the skin plate of one shield machine,
A joining method for a shield machine has also been developed, in which the circular cutter plate is rotated when the shield machine moves forward to excavate an unexcavated portion of the ground and penetrate a tunnel.

0004

[Problem to be Solved by the Invention] However, according to the former method, the skin plates of both shield machines are kept at a constant interval, and the ground between these skin plates and the ground around the skin plates are frozen. Therefore, since the ground to be frozen is wide, it takes an extremely long time to freeze, which not only lengthens the construction period but also increases construction costs. This will require excavation of the ground between the skin plates.

On the other hand, according to the latter joining method, the skin plates and circular cutter plates of both shield machines are formed to have the same diameter for excavating a tunnel of a constant diameter, so that the skin plate of one shield machine has the same diameter. At present, it is difficult to adopt this method because it requires high precision to smoothly fit the circular cutter plate of the other shield machine into the shield machine, and there are cases where it is difficult to join the shield machine reliably. The present invention aims to solve these problems and provide an underground joining method for a shield machine that can easily and reliably join both shields by using the former freezing means, and a shield machine for the joining. It is something.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the underground bonding method of the present invention includes a first shield machine in which a freezing pipe is disposed within the thickness of the open end of the skin plate. The second shield machine excavates a tunnel in the direction of approaching each other while rotating the circular cutter plates of both shield machines with them protruding from the open end of the skin plate, and when joining, the circular cutter plates of both shield machines come into contact with each other. Or, after stopping the overcutters protruding from the outer circumferential surface of the circular cutter plate in close proximity to each other and immersing the overcutter into the circular cutter plate, only the skin plates of both shield machines are advanced and their open ends are brought into contact with each other. Then, a refrigerant is supplied from inside the machine to the freezing tube to freeze the ground around the skin plate joint.

[0007] Also, as a joining shield machine for carrying out this method, there is an underground joining shield machine consisting of a first shield machine and a second shield machine that excavate the ground by rotating a propulsion jack and a circular cutter. These shield machines have a freezing pipe connected to a freezing supply device installed inside the machine within the thickness of the open end of the skin plate, and the circular cutter protrudes from the open end of the skin plate. Over cutters are disposed at a plurality of locations on the outer peripheral surface of the plate so as to be retractable and retractable, and the circular cutter plates of both shield machines are configured to be retractable and retractable from the open end of the skin plate using jacks.

[0008]

[Operation] Since excavation is performed until the circular cutter plates of both shield machines are in contact or close to each other, there is almost no need for ground excavation work between the shield machines after joining. Further, after excavation, only the skin plates of both shield machines are advanced and their open ends are brought into contact with each other, so that groundwater and earth and sand can only infiltrate between the joint end surfaces of both skin plates. Then, the ground around this joint end face is frozen by supplying refrigerant to the freezing pipe that is installed in a ring shape within the thickness of the opening end of the skin plate of both shield machines, so that the ground around the joint end surface is frozen in a narrow area. By simply freezing the material, it is possible to reliably prevent the infiltration of earth, sand, and groundwater, and this, together with the reduction in freezing processing time, shortens the construction period and reduces construction costs.

[0009]

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a first shield machine, 2 is a second shield machine, and these shield machines 1 and 2 have the same structure. ing. That is, these shield machines 1 and 2 have a skin plate 3 of the same diameter, a ring-shaped freezing tube 4 disposed within the thickness of the open end of this skin plate 3, and a It is provided with a circular cutter plate 5, a partition wall 7 which penetrates and supports a rotation center axis 6 of the circular cutter plate 5 so as to be rotatable and movable back and forth, and a propulsion jack 8.

The circular cutter plate 5 is a closed type cutter plate having a large number of excavation bits 10 protruding from the front surface and a soil intake slit (not shown). A hydraulic jack 11 is formed to have a small diameter, has overcutter 9 projectingly protruding from a plurality of locations on its outer peripheral surface for excavating the ground in front of the skin plate 3, and is attached to the back surface of the circular cutter plate 5. This allows the over cutter 9 to protrude and retract from the outer peripheral surface of the circular cutter plate 5.

The freezing tube 4 is housed in an annular groove 12 formed on the open end surface of the skin plate 3, and the opening of the annular groove 12 is made of a material with good heat conductivity. It is closed with a lid 13 made of. Furthermore, a refrigerant liquid supply/discharge pipe 14 is arranged in the skin plate 3 in the longitudinal direction of the skin plate 3, and the front end of the refrigerant liquid supply/discharge pipe 14 is connected to and communicates with the freezing pipe 4. The end thereof is connected to a refrigerant supply device 15 disposed inside the machine via feed/discharge pipes 16 and 17 to circulate the refrigerant liquid.

A partition wall 7 that penetrates and supports the circular cutter plate 5 so as to be able to rotate and move back and forth about the central axis of rotation 6 is attached to the inner peripheral surface of the front end of the skin plate 3 at an appropriate distance from the back surface of the circular cutter plate 5. A rotary drive motor 18 installed on the back side of the partition wall 7 rotates the circular cutter plate 5 via an appropriate transmission mechanism such as a meshing gear train, and a rotary drive motor 18 installed on the back side of the partition wall 7 rotates the circular cutter plate 5. A hydraulic jack 20 for longitudinal movement is installed between the bracket body 19 and the bulkhead 7 attached to the
are connected to each other so that the jacks 20 can be moved back and forth in the axial direction.

Hydraulic jack 1 for operating the overcutter
1 is connected and communicated from a pressure oil supply device 21 disposed inside the machine via a rotary joint 22 to hydraulic pressure supply and discharge pipes 23 and 24 disposed through the rotation center shaft 6, and these pipes 23, It is operated by pressure oil flowing inside 24.

Further, the space between the opposing surfaces of the circular cutter plate 5 and the partition wall 7 is formed into an earth and sand intake chamber 25.
The mud feeding/discharging pipes 26 and 27 connected to the tunnel are configured so that the excavated earth and sand brought into the room by the flowing muddy water are discharged to the outside of the tunnel, respectively.

[0015] The first shield machine and the second shield machine configured in this way
The shield machines are propelled toward each other from starting pits spaced apart by an appropriate length, and are brought closer to each other while excavating a tunnel. The ground is excavated by a circular cutter plate 5 and overcutter 9 protruding from its outer circumferential surface at a plurality of locations, and the excavated earth and sand is taken into the earth and sand intake chamber 25 and discharged through the mud water pipes 26 and 27 that flow back.

Further, as the tunnel is excavated, its wall surface is covered with segment lining 28, and the shield machines 1, 2 receive the propulsion jack 8 on the end face of the segment lining 28 and extend the jack 8. Promote.

In this way, while excavating and constructing the tunnel 29 by the first and second shield machines 1 and 2, both the shield machines 1 and 2 are brought close to each other and stopped with the circular cutter plates 5 and 5 close to each other or in contact with each other. let At this time, both shield machines 1 and 2 are stopped at a position where the circular cutter plates 5 and 5 of both shield machines 1 and 2 are facing each other with an appropriately small interval, and the opposing circular cutter plates 5 and 5 are stopped. By operating the back and forth motion jack 20 while rotating only the circular cutter plates 5 by the motor 18 and moving the unexcavated ground between them forward, as shown in FIG. Alternatively, excavate until a gap of several mm is left.

Next, after the overcutter 9 protruding from the circular cutter plate 5 of both shield machines 1 and 2 is immersed into the circular cutter plate 5 by the hydraulic jack 11, the propulsion jack 8 is operated and both shield machines 1 , 2 and in synchronization with the propulsion speed, the jack 2 for longitudinal movement
By contracting the circular cutter plates 5 and 5, the contact state between the circular cutter plates 5 and 5 is maintained, and as shown in FIG.
The open end surfaces of the skin plates 3 and 3 are joined together, and the circular cutter plate 5 is housed in the skin plate 3.

After the skin plates 3, 3 of both shield machines 1, 2 are joined together in this way, the refrigerant supply device 15 is operated to supply the skin from the supply/discharge pipes 16, 17 through the supply/discharge pipe 15 inside the skin plate 3. When a refrigerant is supplied and circulated through the freezing pipe 4 within the wall thickness of the front end of the plate, the ground surrounding the joint surface of the skin plates 3, 3 is frozen, and groundwater is prevented from entering the machine through the joint.

After that, the shield machines 1 and 2 are dismantled, leaving the skin plates 3 of both shield machines 1 and 2, and the tunnels excavated by both shield machines 1 and 2 are made to communicate with each other, and the skin plates 3 of the skin plates 3 are disassembled. Lining the inner circumferential surface by pouring concrete, etc.

[0021]

As described above, according to the present invention, the first shield machine and the second shield machine excavate tunnels in the direction approaching each other.
The circular cutter plate connected to the shield machine can be moved forward and backward by a jack, so when joining, both shield machines can be stopped in a sufficiently close state and only the circular cutter plate can be rotated and moved forward. Therefore, the unexcavated portion between both shield machines can be reliably and easily excavated, the circular cutter plates can be in contact with each other or very close to each other, and the ground excavation work between the shield machines after joining can be eliminated. Can be done.

Furthermore, while contracting the jack for moving the circular cutter plate back and forth, the skin plate of the shield machine can be advanced by the propulsion jack according to the amount of contraction, and in this way, only the skin plates of both shield machines are advanced. Since the open ends of the levers are brought into contact with each other, the circular cutter plate is housed within the skin plate, and it is possible to reliably prevent groundwater and earth and sand from entering from other than the gap between the joint end faces of both skin plates.

[0023]Then, the ground surrounding the joint end surface between the skin plates is frozen by supplying a refrigerant to a freezing pipe that is installed in a ring shape within the thickness of the open end of the skin plates of both shield machines. By simply freezing a small area of the ground, it is possible to prevent the infiltration of earth and sand and groundwater. Therefore, together with the reduction of freezing processing time, the construction period is shortened, and it is possible to prevent excavation using both shield machines. Penetration work between tunnels can be performed inexpensively and efficiently.

[Brief explanation of the drawing]

[Fig. 1] A simplified longitudinal cross-sectional side view of a joining shield machine showing the state of tunnel excavation.

[Fig. 2] Partially enlarged vertical sectional side view before joining,

FIG. 3 is a partially enlarged longitudinal sectional side view at the time of joining.

[Explanation of symbols]

1 First shield machine 2 Second shield machine 3. Skin plate 4 Freezer tube 5　Circular cutter plate 6 Rotation center axis 7 Partition wall 8 Propulsion jack 9 Over cutter 15 Refrigerant supply device 20 Front and rear dynamic jack

Claims (2)

[Claims] Claim 1: A first shielding machine and a second shielding machine each having a freezing tube disposed within the thickness of the opening end of the skin plate cause the circular cutter plates of both shielding machines to protrude from the opening end of the skin plate. tunnels are excavated in the direction of approaching each other while rotating in the state of After being immersed in the circular cutter plate, only the skin plates of both shield machines are advanced so that their open ends come into contact with each other, and then refrigerant is supplied from inside the machine to the freezing pipe to cut the ground around the skin plate joint. A method for underground joining of a shield machine, which is characterized by freezing. 2. A shield machine for underground bonding consisting of a first shield machine and a second shield machine that excavate the ground by rotating a propulsion jack and a circular cutter plate, and these shield machines A freezing pipe communicating with a freezing supply device installed inside the machine is provided within the wall thickness of the end portion, and an over cutter can be freely retracted from multiple locations on the outer peripheral surface of the circular cutter plate that protrudes from the open end of the skin plate. A shield machine for underground joining, characterized in that the circular cutter plates of both shield machines are configured to be retractable from the open end of the skin plate by means of a jack.