JPH089947B2 - Underground joining method of shield machine and shield machine for joining - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining two shield machines to each other when the two shield machines are excavated in a direction of approaching each other to excavate and penetrate a tunnel, and a method of implementing this method. It relates to a shield machine used for.

[0002]

2. Description of the Related Art Conventionally, when two tunneling machines are used to excavate a tunnel from opposite directions and a tunnel excavated by these shielding machines is penetrated in the middle of the tunnel, the tip portions of the two shielding machines should be close to each other. In this state, the outer ground between the tips is frozen to prevent leakage of groundwater, and then the shield machine is disassembled to excavate the unexcavated portion. However, there is a problem that not only the construction period becomes long, but also the construction cost becomes high.

For this reason, while the circular cutter of one shield machine is retracted, the circular cutter of the other shield machine is advanced to be inserted into the skin plate of one shield machine, and the circular cutter is rotated during the advancement. A method of joining shield machines has been developed in which the unexcavated ground is excavated to penetrate the tunnel.

[0004]

However, the skin plates and the circular cutters of both shield machines are formed to have the same diameter for tunnel excavation of a constant diameter, and therefore, the skin plate of one shield machine and the circular cutter are formed in the other skin machine. In order to fit the circular cutter of the shield machine smoothly, it is necessary to have high accuracy, and it may be difficult to surely join the circular cutter. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide an underground joining method for a shield machine and a shield machine for joining the shield machine, which enables easy and reliable joining of both shields.

[0005]

In order to achieve the above object, according to the present invention, a plurality of overcutters are provided on the outer peripheral surface so as to project and retract, and these circular cutter plates are jacked to open the skin plate. It is a shield machine that can appear and disappear from the end and moves forward with a jack for propulsion.
An air tube is provided around the inner peripheral surface of the tip portion of the skin plate, and a protection ring of the air tube is retreatably fitted on the air tube and the protection ring is formed to have a larger diameter than the circular cutter plate. The first shield machine, and an air tube is provided around the inner peripheral surface of the front end portion of the skin plate which is advanced by the propulsion jack, and a joining ring covering the air tube is movably arranged, and A second shield machine in which the ring is formed to have a larger diameter than the circular cutter plate is used.

Then, a tunnel is excavated in a direction approaching each other by both shield machines, and when the shield machines are joined, the circular cutters of both shield machines are stopped in a state of being in contact with or in proximity to each other, and then these circular cutters. The overcutter protruding from the outer periphery of the plate is immersed in the circular cutter plate, and the skin plate is moved forward to bring the open ends thereof into contact with each other, and further, the protection ring of the first shield machine is retracted and the second shield is moved. The joining ring of the machine is advanced to cover the joining ring between the air tubes of both shield machines, and thereafter, the air tube is expanded and brought into pressure contact with the outer peripheral surface of the joining ring. To do.

[0007]

The circular cutter plates of the first and second shield machines are formed to have a diameter that can be accommodated in the ring through a ring that is loosely fitted in the inner peripheral surface of the front end of the skin plate so as to be movable back and forth. , It is easy to immerse into the skin plate at the time of joining, and both shield machines are propelled so that the tip faces of the opposing skin plates are brought into contact with each other surely, and the infiltration of groundwater or earth and sand is between the joint end faces of these skin plates. Will only be. Then, the protection ring of the first shield machine is retracted and the joining ring of the second shield machine is advanced to extend the joining ring between the air tubes that are provided around the inner peripheral surfaces of the skin plates of both shield machines. The joint end face communicating with the inside of the machine is closed by covering the joint end face.
When the air tube is expanded in this state, the air tube is pressed against the outer peripheral surface of the joining ring to reliably prevent the infiltration of earth and sand or groundwater.

[0008]

Embodiments of the present invention will now be described with reference to the drawings, in which 1 is a first shield machine, 2 is a second shield machine, and skin plates 3 and 4 of these shield machines 1 and 2 are shown. Are formed to have the same diameter, and the inner peripheral surfaces of the open ends of the skin plates 3 and 4 projecting from the partition walls 9 and 10 integrally fixed to the front end thereof respectively have two intervals with a small interval. Circumferential grooves 13 and 14 are provided, and ring-shaped air tubes 5 and 6 are fitted and disposed in the peripheral grooves 13 and 14, respectively.

Further, an air tube protection ring 7 having a diameter slightly smaller than the inner peripheral diameter is removably loosely fitted on the inner peripheral surface of the opening end of the skin plate 3 on the side of the first shield so that the outer peripheral surface thereof. The air tubes 5 and 5 are slidably contacted with each other. Similarly, on the inner peripheral surface of the opening end portion of the skin plate 4 on the second shield machine side, a cylindrical joining ring 8 having the same inner and outer diameters as the protective ring 7 and longer than the protective ring 7 is advanced. The outer peripheral surface of the front end portion is slidably contacted with the air tubes 6, 6.

Ring operating jacks 11 and 12 are attached to a plurality of inner peripheral surfaces of the skin plates on the rear side of the partitions 9 and 10 of the first and second shield machines 1 and 2, respectively. The rod-shaped bodies 15 and 16 which are integrally connected to the rod of 12 in the extension direction are slidably passed through the outer peripheral portions of the partition walls 9 and 10 to be integrally connected to the protection ring 7 and the joining ring 8, respectively. The rings 7 and 8 are moved back and forth by the operation of 11 and 12.

Further, the circular cutter plates 17 and 18 arranged at the open end portions of the skin plates 3 and 4 of the first and second shield machines 1 and 2 respectively have outer diameters of the circular cutter plates 17 and 18 of the rings 7 and 8. These rings 7 and 8 are formed to have a diameter equal to or slightly smaller than the inner diameter.
It is configured so that it can be housed while slidingly contacting the inside, and is held in a state of protruding from the open ends of the skin plates 3 and 4 during excavation.

These circular cutter plates 17, 18 are closed-type cutter plates having a large number of excavating bits 19 projecting from the front surface thereof and provided with earth and sand intake slits (not shown). An overcutter 20 for excavating the ground in front of the skin plates 3 and 4 is projectingly provided at a place so that it can be retracted and retracted, and the overcutter 20 is circularly cut by a hydraulic jack 21 mounted on the rear surface of the circular cutter plates 17 and 18. Board 17,
It is made to appear and disappear from the outer peripheral surface of 18.

Further, an air supply pipe 22 and a water blocking material injection pipe 23 are provided in the wall bodies of the skin plates 3 and 4 of both shield machines 1 and 2 in the longitudinal direction of the skin plate. twenty two
Of the skin plates 3 and 4 between the air tubes 5 and 5 and between the air plates 5 and 6 and the ring 7, It faces to the outer peripheral surface of No. 8, respectively. The air supply pipe 22 and the water blocking material injection pipe 23 are connected to and communicate with the compressor 24 and the water blocking material injection device 25, which are installed at appropriate places in the both shield machines 1 and 2, through pipes 26 and 27, respectively. is there.

The rotation center shafts 28 and 29 of the circular cutter plates 17 and 18 of the first and second shield machines 1 and 2 are rotatably and longitudinally pierced and supported at the centers of the partition walls 9 and 10, respectively. The rotation drive motors 30 and 31 installed on the back side of the partition walls 9 and 10 rotate the gears through an appropriate transmission mechanism such as a meshing gear train, and the rotation center shafts 28 and 29 integrally rotate at the rear ends thereof. Bracket bodies 32, 33 and the partition wall 9 that cannot be fixed
The back-and-forth movement jacks 34 and 35 are respectively connected between 10 and are configured to be moved back and forth in the axial direction by the operation of the jacks 34 and 35.

Reference numeral 36 is a pressure oil supply device at appropriate places in the first and second shield machines 1 and 2, respectively, and rotary joints in which pressure oil supply and discharge pipes 37 and 38 are attached to the rear ends of the rotation center shafts 28 and 29, respectively.
It is connected to the overcutter actuating jack 21 along the circular cutter plates 17 and 18 from the center of rotation via 39. Numerals 40 and 41 are propulsion jacks mounted on the inner peripheral surfaces of the skin plates 3 and 4, respectively.

The spaces between the facing surfaces of the circular cutter plates 17 and 18 and the partition walls 9 and 10 are respectively formed in the earth and sand intake chamber 42, and the feed and discharge mud pipes 43 and 44 communicating with the earth and sand intake chamber 42 are formed. It is configured to discharge the excavated earth and sand taken in the room by the circulating muddy water to the outside of the tunnel.

The first shield machine and the second machine constructed as described above
The shield machine for joining, which comprises a shield machine, advances the first shield machine 1 and the second shield machine 2 from the starting pits having an appropriate length interval in a direction in which they approach each other, and excavates a tunnel while approaching each other. Let Ground is circular cutter plate
18 and 19 and the overcutter 20 excavate, and excavated earth and sand are taken into the earth and sand intake chamber 42 and recirculated, and a mud pipe
It is discharged through 43 and 44.

Further, as the tunnel is dug, its wall surface is lined with a segment 45, and the shield machines 1 and 2 receive the jacks 40 and 41 on the end faces of the segment liner 45 to receive the jacks 40 and 41. Promote by stretching.

Thus, the first and second shield machines 1, 2
While excavating and constructing the tunnel 46, both shield machines 1 and 2 are brought close to each other, and when excavated to a sufficiently close state, the shield machines 1 and 2 are stopped in that state. At this time, both shield machines 1 and 2 are stopped at positions where the circular cutter plates 17 and 18 of both shield machines 1 and 2 are opposed to each other with a small gap, and the opposing circular cutter plates 17 and 18 are stopped. As the unexcavated ground between the circular cutter plates 17 and 18 is rotated by the motors 30 and 31 to operate the forward and backward movement jacks 34 and 35 to move forward, as shown in FIG. Drill until 18 contact each other or have a minimal gap.

Next, after the overcutter 20 protruding from the circular cutter plates 17 and 18 of both shield machines 1 and 2 is immersed in the circular cutter plates 17 and 18 by the hydraulic jack 21, the jacks 40 and 41 for propulsion are inserted. As shown in FIG. 3, the circular cutter plates 17 and 18 are kept in contact with each other by operating them to propel the shield machines 1 and 2 and contracting the front and rear movement jacks 34 and 35 in synchronization with the propulsion speed thereof. As shown in the drawing, the protective ring 7 is formed by joining the open end surfaces of the skin plates 3 and 4 of both shield machines 1 and 2 and inserting the circular cutter plates 17 and 18 into the inner peripheral surfaces of the skin plates 3 and 4, respectively. And store it in the joining ring 8.

After joining the skin plates 3 and 4 or during the joining operation, the joining ring 8 on the side of the second shield machine 2 is advanced by the jack 12 and the protection ring 7 on the side of the first shield machine 1 is jacked. Retreat by 11,
The protection ring 7 is separated rearward from the air tube 5 provided on the inner peripheral surface of the skin plate 3 of the first shield machine 1, while the joining ring 8 is moved forward until reaching the rear side of the air tube 5. By covering the air tubes 5 and 6 of the shield machines 1 and 2, the joint end surface portions of the skin plates 3 and 4 are closed by the ring 8.

After that, the compressor 24 is operated to expand the air tubes 5 and 6, and the joining ring 8
It is pressed against the outer peripheral surface of. In this way, both shield machines 1, 2
After the joining is completed, the water blocking material 47 is supplied from the water blocking material injecting device 25 to the injecting pipe 23 provided in the walls of the skin plates 3 and 4, and the opening of the injecting pipe 23 is completed. From the end, the water blocking material 47 is injected and filled into the gap between the air tubes 5, 5 on the side of the first shield machine and the air tubes 6, 6 on the side of the second shield machine on the outer peripheral surface of the joining ring 8. By solidifying the water blocking material 47, the skin plates 3, 4
It prevents groundwater invading from the joint end face between them from leaking into the plane.

When excavating the tunnel by the shield machines 1 and 2, compressed air is supplied to the air tubes 5 and 6 so as to be in pressure contact with the protective ring 7 and the joining ring 8. Instead of compressed air, a water blocking material may be injected into the tube 6, and the tubes 5 and 6 may be expanded to be pressed against the outer peripheral surface of the joining ring 8. In this case, the water blocking material is solidified. Depending on the air tube 5,6
Since the expanded state is maintained, reliable water stopping can be performed without necessarily filling and solidifying the water tube between the air tubes 5, 5, 6, 6 as described above.

In this way, after the infiltration of groundwater from between the joint end surfaces of the skin plates 3 and 4 is prevented, both shield machines 1 and 4 are left with the skin plates 3 and 4 and the joint ring 8 left.
2 is disassembled, concrete or the like is placed on the inner peripheral surface of the joint to reinforce it, and the tunnels excavated by both shield machines 1 and 2 are communicated with each other.

[0025]

As described above, according to the present invention, since the circular cutter plates of the first and second shield machines are individually movable back and forth by the jacks, both shield machines can be connected at the time of joining. It is possible to surely and easily excavate the unexcavated ground between these shield machines by excavating the circular cutter plate by stopping at a sufficiently close position. Furthermore, since these circular cutter plates are housed in the respective shield machines and the shield machines are advanced to join the open end surfaces of the facing skin plates to each other, the infiltration of groundwater and earth and sand is limited to the gap between the joint end surfaces, Intrusion prevention processing becomes easy.

After the skin plates are joined together, the protection ring of the first shield machine is retracted and the joining ring of the second shield machine is advanced to bring the joining ring to the inner peripheral surfaces of the skin plates of both shield machines. Since it is covered between the surrounding air tubes, the joining end surface communicating with the inside of the machine can be closed with the joining ring, and in this state, the air tube is inflated and joined. Since it is pressed against the outer peripheral surface of the ring, even if the joining ring fitted into the skin plate of the first shield machine is slightly eccentric with respect to the skin plate, the air tube is attached to the entire circumference of the joining ring. The joint structure can be easily and surely pressed by uniformly crimping the entire area to prevent intrusion of earth and sand or groundwater, and tunnels excavated by both shield machines can penetrate each other. Work is one that can be performed better efficiency.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional side view of a shield machine for joining showing a tunnel excavation state.

FIG. 2 is a partially enlarged longitudinal side view before the joining,

FIG. 3 is a partially enlarged vertical side view when joining,

FIG. 4 is a partially enlarged vertical sectional side view showing a joining completed state.

[Explanation of symbols]

 1 1st shield machine 2 2nd shield machine 3 Skin plate 4 Skin plate 5 Air tube 6 Air tube 7 Protective ring 8 Joining ring 9 Bulkhead 10 Bulkhead 11 Jack for ring operation 12 Jack for ring operation 20 Overcutter 22 Air supply pipe 23 Water stop material injection pipe 34 Front / rear movement jack 35 Front / rear movement jack

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masakazu Masuda 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Okumura-gumi Co., Ltd.

Claims (2)

[Claims] 1. A first shield machine in which an air tube is provided around the inner peripheral surface of the front end of the skin plate and a protective ring of the air tube is fitted in a retractable manner, and an inner peripheral surface of the front end of the skin plate. A tunnel is excavated in a direction approaching each other by a second shield machine in which an air tube is provided around the air tube and a joining ring covering the air tube is movably arranged. 2 When joining the shield machines, after stopping the circular cutter plates of both shield machines in contact with or in the proximity of each other, the over cutters protruding from the outer periphery of these circular cutter plates are immersed in the circular cutter plates and the skin The plate is moved forward so that the open ends of the plate come into contact with each other, and further, the protection ring of the first shield machine is retracted, and the joining ring of the second shield machine is installed. By advancing to cover the joining ring across the air tubes of both shield machines, and then expanding the air tube to bring it into pressure contact with the outer peripheral surface of the joining ring. Joining method. 2. An underground joining shield machine comprising a first shield machine and a second shield machine, wherein the first shield machine is
An air tube is provided around the inner peripheral surface of the front end portion of the skin plate that is advanced by the jack for propulsion, and a protection ring of the air tube is fitted in a retractable manner.
In the shield machine, an air tube is provided around the inner peripheral surface of the tip of a skin plate that is advanced by a jack for propulsion, and a joining ring covering the air tube is movably arranged. The circular cutter plate of is formed with a smaller diameter than the above ring and has multiple over cutters protruding and retractable on its outer peripheral surface, and these circular cutter plates can be projected and retracted from the open end of the skin plate by a jack. A shield machine for joining, which is characterized in that it is configured.