JPH04360988A - 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:A protective ring 7 and a joining ring 8 are respectively loosely fitted to the circumferential surfaces of the open ends of skin plates 3 and 4 of both shield machines 1 and 2 through air-tubes 5 and 6 so that they are capable of sliding in the axial directions and, at the same time, circular cutter plates 17 and 18 of both shield machines 1 and 2 can be moved axially with jacks 34 and 35. In the case of joining, the circular cutter plates 17 and 18 are respectively housed in the protective ring 7 and the joining ring 8 and, at the same time, the open ends of the skin plates 3 and 4 are joined with each other. In addition, while moving back the protective ring 7, the joining ring 8 is advanced and is placed between the air tubes 5 and 6 of both shield machines 1 and 2. After that, the expansion and pressure-welding of the air tubes 5 and 6 to the peripheral surface of the joining ring 8 are made.

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 using two shield machines and the tunnel excavated by these shield machines is penetrated at the middle part of the tunnel, the tips of both shield machines are brought close together. A method has been adopted in which the outer ground between the tips is frozen to prevent underground water leakage, and then the shield machine is dismantled and the unexcavated area is excavated. However, there are problems in that not only does the construction period become longer, but the construction cost is also higher.

For this reason, while the circular cutter of one shielding machine is moved backward, the circular cutter of the other shielding machine is advanced and inserted into the skin plate of one shielding machine, and as it moves forward, the rotation of the circular cutter causes A shield machine joining method has been developed that excavates the unexcavated ground and penetrates the tunnel.

0004

[Problems to be Solved by the Invention] However, the skin plate and circular cutter of both shield machines are formed to have the same diameter for excavating a tunnel of a constant diameter, and therefore, the skin plate of one shield machine has the same diameter as that of the other shield machine. At present, it is difficult to employ this method because high precision is required to smoothly insert the circular cutter of the shield machine, and there are cases where it is difficult to join reliably. It is an object of the present invention to solve these problems and to provide a method for underground joining of a shield machine and a shield machine for the joining, which can easily and reliably join both shields.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention has a plurality of overcutters protruding from the outer circumferential surface so as to be freely protruding and retractable, and these circular cutter plates are cut into an opening in a skin plate by a jack. This is a shield machine that can come out and go out from the end, and an air tube is provided around the inner peripheral surface of the tip of the skin plate, and a protective ring of the air tube is fitted onto the air tube so that it can be retracted, and this protection A first shield machine in which a ring is formed to have a larger diameter than the circular cutter plate, and an air tube is provided around the inner peripheral surface of the tip of the skin plate, and a joining ring covering the air tube is freely advanced. A second shielding machine is used in which the cutter plate is disposed in the circular cutter plate, and the ring is formed to have a larger diameter than the circular cutter plate.

[0006] Then, tunnels are excavated in directions approaching each other by both shield machines, and when these shield machines are joined, the circular cutters of both shield machines are stopped in contact with or close to each other, and then these circular cutters The over cutter protruding from the outer periphery of the plate is immersed into the circular cutter plate, the skin plate is advanced so that their open ends abut each other, and the protective ring of the first shield machine is retreated and the second shield is removed. The connecting ring of the machine is moved forward to cover the space between the air tubes of both the shield machines, and then the air tube is expanded and brought into pressure contact with the outer peripheral surface of the connecting ring. It is something to do.

[0007]

[Operation] The circular cutter plates of the first and second shielding machines are formed with a diameter that can be accommodated in the ring which is loosely fitted to the inner peripheral surface of the front end of the skin plate so as to be able to move back and forth. At the time of joining, the shields easily immerse into the skin plates, and by propelling both shields, the leading edges of the opposing skin plates are brought into contact with each other, and the infiltration of groundwater and earth is prevented between the joined end surfaces of these skin plates. Only. Then, the protection ring of the first shield machine is moved backward, and the joining ring of the second shield machine is moved forward, so that the joining ring extends between the air tubes provided around the inner peripheral surfaces of the skin plates of both shield machines. The joint end surface communicating with the inside of the machine is closed by covering the joint with the inside of the machine. When the air tube is expanded in this state, the air tube comes into pressure contact with the outer circumferential surface of the joint ring, thereby reliably preventing the intrusion of earth and sand and groundwater.

[0008]

[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 the skin plates 3 of these shield machines 1 and 2 are
, 4 are formed to have the same diameter, and are spaced apart from each other by a small distance on the inner peripheral surface of the open end of the skin plates 3 and 4, which protrude from the partition walls 9 and 10, respectively, which are integrally fixed in the front end thereof. Strip-like circumferential grooves 13 and 14 are provided, and ring-shaped air tubes 5 and 6 are fitted and disposed within the circumferential grooves 13 and 14, respectively.

Furthermore, an air tube protection ring 7 having a diameter slightly smaller than the inner circumferential diameter is loosely fitted on the inner circumferential surface of the open end of the skin plate 3 on the side of the first shield machine so as to be retractable. The air tubes 5, 5 are in sliding contact with each other. Similarly, on the inner peripheral surface of the open end 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 circumferential surface of the front end portion is slidably connected to the air tubes 6, 6.

At a plurality of locations on the inner peripheral surface of the skin plate on the rear side of the bulkheads 9 and 10 in the first and second shield machines 1 and 2,
Ring actuating jacks 11 and 12 are installed, respectively, and rod-like bodies 15 and 16, which are integrally connected to the rods of these jacks 11 and 12 in the extending direction, are slidably passed through the outer periphery of the partition walls 9 and 10. The protection ring 7 and the joining ring 8 are integrally connected to each other, and the rings 7 and 8 are moved back and forth by the operation of the jacks 11 and 12.

Further, the circular cutter plates 17 and 18 disposed at the open ends of the skin plates 3 and 4 of the first and second shield machines 1 and 2, respectively, have their outer diameters equal to those of the rings 7 and 8. These rings 7 are formed to have a diameter equal to or slightly smaller than the inner diameter.
, 8, and is constructed so that it can be stored in sliding contact with the skin plates 3, 8, and is held in a state where it protrudes from the open ends of the skin plates 3, 4 during excavation.

These circular cutter plates 17 and 18 are closed type cutter plates having a large number of excavation bits 19 protruding from the front surface and soil intake slits (not shown). An overcutter 20 for excavating the ground in front of the skin plates 3 and 4 is protruded so as to be able to appear and retract freely at a location, and the overcutter 20 is moved into a circular cutter by a hydraulic jack 21 attached to the back of the circular cutter plates 17 and 18. It is made to protrude and retract from the outer peripheral surfaces of the plates 17 and 18.

Furthermore, inside the walls of the skin plates 3 and 4 of both shield machines 1 and 2, there are an air supply pipe 22 and a water stop material injection pipe 23.
are arranged in the length direction of the skin plate, and the tips of the air supply tubes 22 are communicated with the air tubes 5 and 6, and the open ends of the water stop material injection tubes 23 are connected to the air tubes 5 and 6.
The inner circumferential surfaces of the skin plates 3, 4 between 5 and 6 and 6 face toward the outer circumferential surfaces of rings 7, 8, respectively. These air supply pipe 22 and water stop material injection pipe 23 are
A compressor 24 and a water stop material injection device 25 installed at appropriate locations inside the shield machines 1 and 2 are connected and communicated via pipes 26 and 27, respectively.

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 connected to the partition wall 9,
10 so as to be rotatable and movable back and forth, respectively, and are rotated by rotary drive motors 30 and 31 installed on the back side of the partition walls 9 and 10 via an appropriate transmission mechanism such as a meshing gear train. together with these rotation center shafts 28
, 29, and between the bracket bodies 32, 33 and the bulkheads 9, 10, which are attached to the rear ends of 29 so as not to rotate integrally, jacks 34, 35 for longitudinal movement are connected, respectively. It is configured to be moved back and forth.

Reference numeral 36 denotes a pressure oil supply device installed at a suitable location inside the first and second shield machines 1 and 2, respectively, and the pressure oil supply and discharge pipes 37 and 3
8 is connected to the jack 21 for operating the overcutter along the circular cutter plates 17, 18 from inside the rotation center shafts 28, 29 via a rotary joint 39 attached to the rear ends of the rotation center shafts 28, 29. 40 and 41 are skin plates 3
This is a propulsion jack attached to multiple locations on the inner circumferential surface of .

Furthermore, the circular cutter plates 17 and 18 and the partition walls 9 and 1
The spaces between the facing surfaces of the earth and sand intake chambers 42 are formed respectively, and the excavated earth and sand taken into the chamber by the muddy water flowing back through the feed and mud discharge pipes 43 and 44 connected to the earth and sand intake chambers 42 are discharged to the outside of the tunnel. It is configured to do so.

[0017] The first shield machine and the second shield machine configured in this way
The joining shield machine consists of a shield machine and a first shield machine 1 and a second shield machine 2. The first shield machine 1 and the second shield machine 2 are propelled toward each other from starting pits with an appropriate length interval, and while excavating a tunnel, approach each other. let The ground is excavated by circular cutter plates 18, 19 and an overcutter 20,
The excavated earth and sand is taken into the earth and sand intake chamber 42 and discharged through the return flow and mud water pipes 43 and 44.

Further, as the tunnel is excavated, its wall surface is covered with a segment lining 45, and the shield machines 1 and 2 are equipped with propulsion jacks 40 and 41 on the end faces of the segment lining 45.
The vehicle is propelled by extending the jacks 40 and 41.

In this way, the first and second shield machines 1 and 2
While excavating and constructing the tunnel 46, both the shield machines 1 and 2 are brought close to each other, and when they are excavated sufficiently close to each other, they are stopped in that state. At this time, both shield machines 1 and 2 are stopped at a position where the circular cutter plates 17 and 18 of both shield machines 1 and 2 are facing each other with an appropriately small interval, and the circular cutter plates 17 and 18 facing each other are stopped. As shown in FIG. 2, the circular cutter plates 17, 18 are rotated by the motors 30, 31, and the jacks 34, 35 are operated to advance the unexcavated ground between them. 18 are in contact with each other or have a minimal spacing between them.

Next, the over cutters 20 protruding from the circular cutter plates 17 and 18 of both shield machines 1 and 2 are immersed into the circular cutter plates 17 and 18 by the hydraulic jack 21, and then the propulsion jacks 40 and 41 are lowered. By operating the shield machines 1 and 2 to propel them, and contracting the forward and backward movement jacks 34 and 35 in synchronization with the propulsion speed, the state shown in FIG. As shown, a protective ring 7 has the open end surfaces of the skin plates 3 and 4 of both shield machines 1 and 2 joined together, and circular cutter plates 17 and 18 are inserted into the inner peripheral surfaces of the skin plates 3 and 4, respectively. and stored in the joining ring 8.

After joining the skin plates 3 and 4, or during the joining operation, the joining ring 8 on the second shield machine 2 side is advanced by the jack 12, and the protective ring 7 on the first shield machine 1 side is jacked up. 11 to move the protective ring 7 backward away 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 reaches the rear side of the air tube 5. By moving the ring 8 forward to cover the air tubes 5 and 6 of both shield machines 1 and 2, the joint end surfaces of the skin plates 3 and 4 are closed by the ring 8.

Thereafter, the compressor 24 is operated to expand these air tubes 5 and 6 and bring them into pressure contact with the outer peripheral surface of the joining ring 8. In this way, both shield machines 1,
2 is completed, and after the completion, the water stop material 47 is supplied from the water stop material injection device 25 to the injection pipe 23 provided in the walls of the skin plates 3 and 4, and the water stop material 47 is
The water stop material 47 is injected and filled into the gap between the air tubes 5, 5 on the first shield machine side and the air tubes 6, 6 on the second shield machine side on the outer peripheral surface of the joining ring 8 from the open end of the By solidifying this water stop material 47, groundwater that enters from the joint end surface between the skin plates 3 and 4 is prevented from leaking into the machine.

When excavating a tunnel using the shield machines 1 and 2, compressed air is supplied to the air tubes 5 and 6 to bring them into pressure contact with the protective ring 7 and the joining ring 8. Instead of compressed air, a water stop material may be injected into the tubes 6 to expand the tubes 5 and 6 so that they are brought into pressure contact with the outer peripheral surface of the joining ring 8. In this case, the water stop material solidifies. By air tube 5,6
Since the air tubes are kept in an expanded state, reliable water stoppage can be achieved without necessarily filling and solidifying the waterstop material between the air tubes 5 and 5 and between 6 and 6 as described above.

After preventing the infiltration of groundwater from between the joining end surfaces of the skin plates 3 and 4, both shield machines 1 and
2 is dismantled, concrete 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 made to communicate with each other.

[0025]

As described above, according to the present invention, the circular cutter plates of the first and second shield machines are independently movable back and forth by the jacks, so when joining, both shield machines can be moved back and forth. By stopping the shield machines at sufficiently close positions, the unexcavated ground between these shield machines can be reliably and easily excavated by the circular cutter plate. Furthermore, since these circular cutter plates are housed in their respective shield machines and the shield machines are moved forward to join the open end faces of the opposing skin plates, the infiltration of groundwater and earth and sand is limited to the gap between the joined end faces. Infiltration prevention treatment becomes easy.

After the skin plates are joined, the protective ring of the first shield machine is moved backward, and the joining ring of the second shield machine is moved forward, so that the joining ring is attached to the inner peripheral surface of the skin plates of both shield machines. Since the surrounding air tubes are covered, the joining end face communicating with the inside of the machine can be closed by the joining ring, and in this state, the air tubes are expanded and joined. Since the air tube is in pressure contact with the outer circumferential 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 will not touch the entire circumference of the joining ring. It is possible to create a bonded structure that easily and reliably prevents the infiltration of earth and sand and groundwater by uniformly crimping the entire area, and allows efficient penetration work between tunnels excavated by both shield machines.

[Brief explanation of drawings]

[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] Partially enlarged vertical sectional side view at the time of joining,

FIG. 4 is a partially enlarged vertical cross-sectional side view showing a state in which joining is completed.

[Explanation of symbols]

1 First shield machine 2 Second shield machine 3. Skin plate 4. Skin plate 5 Air tube 6 Air tube 7 Protective ring 8 Joining ring 9 Partition wall 10 Partition wall 11 Ring operation jack 12 Ring operation jack 20 Over cutter 22 Air supply pipe 23 Water stop material injection pipe 34 Front and rear dynamic jack 35 Front and rear dynamic jack

Claims (2)

[Claims] Claims: 1. A first shield device, which has an air tube surrounding the inner peripheral surface of the distal end of the skin plate, and a protective ring of the air tube is fitted in a retractable manner, and the inner circumferential surface of the distal end of the skin plate A tunnel is excavated in a direction in which the first and second 2
When joining the shield machines, after stopping the circular cutter plates of both shield machines in contact with or close to each other, the over cutters protruding from the outer periphery of these circular cutter plates are immersed into the circular cutter plate, and the skin plate is removed. are advanced to bring their open ends into contact with each other, and then the first
The protection ring of the shield machine is moved back and the joining ring of the second shield machine is moved forward to cover the space between the air tubes of both shield machines, and then the air tubes are expanded and joined. An underground joining method for a shield machine, which is characterized in that it is brought into pressure contact with the outer peripheral surface of a shielding ring. 2. A shielding machine for underground bonding consisting of a first shielding machine and a second shielding machine, wherein the first shielding machine is provided with an air tube around the inner peripheral surface of the tip of the skin plate, The protective ring of the air tube is fitted so that it can be retracted freely, and the second shield machine has an air tube surrounding the inner peripheral surface of the tip of the skin plate, and the connecting ring that covers the air tube can be freely moved forward. Furthermore, the circular cutter plates of both shield machines are formed to have a smaller diameter than the ring, and a plurality of over cutters are protruded from the outer circumferential surface so as to be able to appear and retract freely. A welding shield machine characterized by being configured to be able to appear and retract from the open end of a skin plate using a jack.