JPH0588351B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" This invention is applicable to the excavation of a single tunnel from both ends of the tunnel simultaneously using two shield machines, and the ground excavation of the shield machines when simultaneously excavating one tunnel from both ends of the tunnel and joining them in the middle. Concerning ground improvement method for face during intermediate jointing.

"Prior Art" The applicant previously provided a shield tunnel underground joining method.

This construction method includes a first shield machine and a skin plate, in which the tip of the skin plate is double formed by an outer cylinder and an inner cylinder, and a penetrating ring is stored between the outer cylinder and the inner cylinder. A second shield machine, the tip of which is double formed by an outer cylinder and an inner cylinder having the same diameter as the first shield machine, is used as a set to construct a tunnel from both ends so as to join in the middle. In the process of excavating a tunnel, and immediately before the end of the tunnel excavation process, the penetrating ring of the first shield machine is slid forward along the axis of the first shield machine, and the penetrating ring allows the first and A process of covering the ground at the tunnel joint left between the second shield machines, and after the completion of this process, the shield machines are dismantled with the skin plates of the first and second shield machines remaining. The method consists of excavating the ground at the joint, and then pouring concrete on the inner surface of the skin plate to line the wall surface of the joint.

"Problems to be Solved by the Invention" The above-mentioned underground joint construction method must ensure safe sealing and water stoppage against soil water pressure acting from the ground near the tunnel joint to the joint. At the same time, it is possible to significantly reduce the construction cost and construction period required for joining tunnels.However, even with this construction method, there remains room for consideration in the following points, for example.

Depending on the soil quality of the ground to be excavated, the earth and sand at the face can easily become an obstacle when the penetrating ring slides, making it difficult to easily and reliably penetrate the ground at the joint between the shield machines. thing.

When extruding the penetrating ring along the axis of the shield machine, there is a risk that the face of the joint between the shield machines may sink.

The present invention has been made in view of the above-mentioned problems, and its purpose is to replace the earth and sand at the face with mud, thereby eliminating obstacles such as boulders between the two shield machines and preventing penetration. To provide a ground improvement method for a face when joining a shield machine underground, which allows a ring to easily and reliably penetrate into a penetration chamber and prevents ground subsidence.

"Means for Solving the Problems" In order to achieve the above-mentioned object, the present invention provides an underground bonding method for shielding machines using penetrating rings.
When penetrating the penetration ring provided in the second shield machine into the penetration chamber provided in the second shield machine,
By injecting mud into the face while rotating the cutter devices installed at the tips of both shield machines in opposite directions, the earth and sand in the face is replaced with mud while stirring, and then the tip of the cutter device is replaced with mud. It is characterized in that the penetration ring is made to penetrate into the penetration chamber while being reduced in size.

"Embodiments" Examples of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 are diagrams illustrating a method for improving the ground of a face during underground bonding of a shield machine according to an embodiment of the present invention.

In the figure, the symbol G is the ground near the junction of the shield tunnel that has been excavated from both ends.
In this ground G, the first shield machine 1 excavates a first tunnel Ta on the right side of the page using a cutter device 10 installed at its front part, and the second shield machine 2 excavates the first tunnel Ta on the right side of the page. The other tunnel Tb is excavated on the left side by a cutter device 20 provided at the front. The wall surface of the tunnel Ta formed behind the shield machine 1 is composed of segments 3a, 3a, . . . assembled inside the shield machine 1.
The wall surface of the tunnel Tb formed at the rear of the shield machine 2 is primarily lined by the segments 3b, 3b, . . . assembled inside the shield machine 2. It is being done.

The first shield machine 1 is provided with a skin plate 1a that is formed into a cylindrical shape and forms the outer shell of the main body of the shield machine 1. This skin plate 1
The tip portion 1b of a is double formed by an outer cylinder 11 formed to have the same diameter as the skin plate 1a, and an inner cylinder 12 formed to have a smaller diameter than this outer cylinder 11, and is stored between these. Room _R1 is provided.

This storage chamber _R1 stores a cylindrical penetrating ring 13 that is one piece or divided into a plurality of pieces.
A bulging portion 13a is formed at the rear end of the penetrating ring 13. Further, the storage chamber R ₁ is filled with a highly viscous water sealing agent such as rubberized asphalt or grease, which allows the outer cylinder 11 and the inner cylinder 12 to
A water stop means is constructed between the

A partition plate 14 formed perpendicularly to the axis of the shield machine 1 is provided inside the inner cylinder 12. The inner cylinder 12 and the skin plate 1a are connected by a ring-shaped support plate 15 formed perpendicular to the axis of the shield machine 1. A plurality of extrusion jacks 17, 17, . .
Further, a plurality of propulsion jacks 18, 18, . . . are attached to the rear surface of the bearing pressure plate 15 in the circumferential direction thereof, and the working end 18a of the propulsion jack is in contact with the side surface of the segment 3a at the tip.

The cutter device 10 provided at the front part of the first shield machine 1 is formed to have a slightly smaller diameter than the inner cylinder 12, and its shaft body 19 is pivotally supported by the partition plate 14, so that the cutter device 10 is provided at the front part of the first shield machine 1. is supported by A cutter portion 10a that is extendable and retractable in the radial direction of the shielding machine 1 is provided at the edge of the cutter device 10.

The second shield machine 2 is provided with a skin plate 2a formed in a cylindrical shape having the same diameter as the first skin putter 1a. Similarly, the outer cylinder 21 is formed to have the same diameter as the skin plate 2a, and the inner cylinder 22 is formed to have a smaller diameter than this outer cylinder 21. A penetration chamber _R2 is provided to accommodate one penetration ring 13. This outer cylinder 21
The penetration chamber R ₂ between the outer cylinder 21 and the inner cylinder 22 is filled with a highly viscous water sealing agent such as rubberized asphalt or grease. It is configured.

A partition plate 24 formed perpendicularly to the axis of the shield machine 2 is provided inside the inner cylinder 22 . The inner cylinder 22 and the skin plate 2a are connected by a ring-shaped bearing plate 25 formed so as to be perpendicular to the two axes. Further, a ring 23 is provided inside the skin plate 2a, and a plurality of propulsion jacks 28, 28, . . . are attached to the rear surface of the ring 23 in the circumferential direction. The working end 28a of the propulsion jack 28 is in contact with the side surface of the segment 3b at the tip.

The cutter device 20 provided at the front part of the second shield machine 2 is formed to have a slightly smaller diameter than the inner cylinder 22, and its shaft body 29 is pivotally supported by the partition plate 24, so that the cutter device 20 is installed at the front part of the second shield machine 2. It is supported by 2. At the edge of this cutter device 20, the first
Similar to the cutter device 10, the shield machine 2 is provided with a cutter portion 20a that is extendable and retractable in the radial direction.

In addition, the first and second shield machines 1 and 2 include
Mud soil press-in pipes 16 and 26 are provided, respectively, and the open ends of these pipes 16 and 26 are located at the tip of each shield machine 1 and 2.

Next, an embodiment of the ground improvement method for the face of the shield machine during underground bonding of the present invention will be described in accordance with the order of steps for constructing a tunnel using FIGS. 1 to 4.

(i) Tunnel excavation First, from the right side in FIG.
segment 3 on the wall of the excavated pit.
A, 3b, ... are lined, and this segment 3
Propulsion jack 18 takes reaction force to a, 3b,...
By driving 18,..., one tunnel
We will continue to build Ta. At this time, the extendable cutter portion 10a of the cutter device 10 is expanded and contracted so that the cutter device 10 can excavate a tunnel having at least the same diameter as the outer cylinder 11.

At the same time, from the left side in Figure 1, the second
The ground G is excavated by the cutter device 20 using the shield machine 2 of Propulsion jack 2
8, 28, . . . to build the other tunnel Tb. At this time, the cutter device 2
The telescopic cutter portion 20a of the cutter 20 is extended so that the cutter device 20 can excavate a tunnel having at least the same diameter as the skin plate 2a (see FIG. 1).

(ii) Replacement of earth and sand on the face Then, at the junction of the tunnel, the first shield machine 1 and the second shield machine 2 are made to face each other leaving a predetermined length of ground Gi (approximately 30 cm to 1). Next, as shown in FIG. 2, with the two shield machines 1 and 2 placed close to each other, the pipe is cut while rotating the cutter devices 10 and 20 of both shield machines 1 and 2 in opposite directions. 16 and 26, mud is injected into the ground Gi at the tunnel joint, and the earth and sand at the face are replaced with mud while stirring. Through this operation, the earth and sand on the face of the tunnel joint is replaced with mud, there are no obstacles such as boulders between the two shield machines 1 and 2, and by maintaining a constant pressure on the mud, There is no risk of ground subsidence at the joint.

(iii) Insertion of penetration ring After the replacement of the mud is completed, the stretched cut portions 10a, 20a are shortened to their original lengths.
Here, the cutter devices 10 and 20 each have an inner cylinder 1
2 and 22, so if the cut portions 10a and 20a are shortened, the inner cylinder 1
There is a risk that earth and sand may infiltrate into the shield machines 1 and 2 from between 2 and 22 and the cutter devices 10 and 20.However, in the present invention, since a constant pressure is applied to the mud, there is a possibility that the earth and sand will infiltrate. There is no.

Then, the extrusion jack 1 of the first shielding machine 1
7, the tip of the penetrating ring 13 becomes the second
This penetrating ring ₁ is inserted into the penetrating chamber R2 between the outer cylinder 21 and the inner cylinder 22 of the shield machine 2.
3 is slid forward along the axis of the shield machine 1. As a result, the penetrating ring 13 covered the ground Gi at the tunnel junction left between the first shield machine 1 and the second shield machine 2.
In addition, since this operation is performed in the ground Gi replaced with mud, the penetration ring 13 can be penetrated easily and reliably.

Here, the rubberized asphalt and grease filled between the outer cylinders 11, 21 and the inner cylinders 12, 22 are removed from between the skin plates 1a and 2a as the penetration ring 13 is pushed out. It leaches into the ground Gi at the joint. Therefore, the leaching of the rubberized asphalt and the grease can further ensure the watertightness of the joint against the ground Gi.

In addition, when performing secondary covering of tunnels Ta and Tb, before lining the tunnel joint, wrap concrete around the inner surfaces of segments 3a and 3b up to the vicinity of this joint (see Figure 3). .

(iv) Disassembling and removing the cutter devices. Then, the cutter devices 10 and 20 of the first and second shield machines 1 and 2 are dismantled and removed, the partition plates 14 and 24 are cut and removed, and further penetration Both ends of the ring 13 are connected to the inner cylinders 12, 2.
Weld to 2. Next, the wall surface of the joint is lined by pouring concrete 31 including the thickness for the secondary lining on the inner wall surface of the skin plate. Here, for the purpose of reinforcing the tunnel joint, a support 32 made of, for example, H-shaped steel may be provided on the inner surface of the inner cylinders 12, 22 (see FIG. 4).

Through the steps (i) to (iv) above, construction of the shield tunnel joint is completed. Here, the ground Gi at the tunnel junction is covered by the penetration ring 13 provided at the skin plate tip 1b of the first shield machine 1, so this penetration ring 13
Earth retention and water stoppage are performed at the joint. Therefore, the shield tunnel joint can be constructed without using an auxiliary method such as the conventional freezing method, and it does not require a large amount of construction cost and construction time as in the conventional freezing method. Construction of joints can be carried out. Therefore, it is possible to ensure earth retention and water stoppage against the earth water pressure acting from the ground G near the tunnel junction to the vicinity of the joint,
It becomes possible to provide an underground joining method for shield tunnels that can be safely constructed and can significantly reduce the construction cost and construction period required for joining tunnels.

In particular, in this joining method, by implementing the ground improvement method of the face of the present invention, the penetrating operation of the penetration ring 13 can be performed easily and reliably, and there is no risk of the ground mound subsidence at the face part. ,
The applicability to the medium joining method can be improved by one.

In addition, in the above embodiment, the first and second
The outer cylinders 11 and 21 and the inner cylinder 1 of the shield machines 1 and 2
Since a water stop means made of rubberized asphalt or grease is provided between the holes 2 and 22, the penetration ring 13 can further ensure water stop when covering the ground Gi at the tunnel joint. . Similarly, the cutter device 1 of each of the shield machines 1 and 2 is
Circumferentially expandable cutter portions 10a, 2 at 0,20
0a, the skin plates 1a, 2
Since there is no reduction in the excavation diameter due to the double formation of the tip portions 1b and 2b of a, it is possible to reduce the propulsion resistance applied to the shield machines 1 and 2 during tunnel excavation.

In addition, in this embodiment, the cutter device 1
0 and 20 are formed to have a slightly smaller diameter than the inner cylinders 12 and 22, so if the shaft support and fixation of the cutter apparatuses 10 and 20 by the partition plates 14 and 24 are released, the cutter apparatuses 10 and 20 can be attached to the inner cylinders 12 and 20. , 22 and the partition plates 14, 24. Therefore, in step (iii), even if the propulsion jacks 18 and 28 are further driven to bring the shield machines 1 and 2 closer together after the cutter parts 10a and 20a are shortened, the cutter device 1
0 and 20 do not touch each other. Then,
By arranging the shield devices 1 and 2 closer to each other and facing each other, water-stopping properties at the tunnel junction can be further ensured.

Note that the ground improvement method of this invention is not limited to the above embodiments. For example, the structure of the cutter devices 10, 20, etc. can be a spoke type, as long as it can stir the earth and sand at the face.
The face plate type is optional.

"Effects of the Invention" As explained above, the present invention provides an underground bonding method for shield machines using penetrating rings, in which two shield machines are placed close to each other, and the penetration ring provided in the first shield machine is When the ring is penetrated into the penetration chamber provided in the second shield machine, mud is injected into the face while rotating the cutter devices provided at the tips of both shield machines in opposite directions. After replacing the earth and sand in the face with mud while stirring, the tip of the cutter device is reduced and the penetration ring is inserted into the penetration chamber, so that the following excellent effects can be achieved.

By replacing the earth and sand at the face with mud, 2
There are no obstacles such as boulders between the shield machines on the stand, and the penetration ring can easily and reliably penetrate into the penetration chamber.

By keeping the mud at a constant pressure when extruding the penetrating ring along the axis of the shield machine, there is no risk of ground subsidence at the face of the joint between the shield machines.

[Brief explanation of the drawing]

Figures 1 to 4 are for explaining one embodiment of the present invention; Figure 1 is a side sectional view showing digging from both sides by two shield machines; The figure is a side cross-sectional view showing the state in which mud is injected into the face while rotating the cutter device in opposite directions. Figure 3 is a side cross-sectional view showing the state in which the penetration ring is penetrated into the penetration chamber. It is a side sectional view showing a state where the inside is turned over. G...Ground, Gi...Tunnel joint ground, Ta
...Tunnel, Tb...Tunnel, 1...First shield machine, 2...Second shield machine, 1a, 2
a...Skin plate, 1b, 2b...Skin plate tip, 3a, 3b...Segment, 1
0, 20... cutter device, 10a, 20a... cutter part, 11, 21... outer cylinder, 12, 22... inner cylinder, 13... penetration ring, 18, 28... propulsion jack, R ₁ ... Storage room, R ₂ ... Penetration room.

Claims (1)

[Claims] 1 Using a first shield machine with a penetration ring stored in its tip and a second shield machine with a penetration chamber in its tip that stores the penetration ring, tunnels are constructed from both ends of the tunnel to be constructed. In the underground joining method for shield machines, which is used to complete a tunnel by excavating a tunnel and joining them midway, the two shield machines are placed close to each other, and the penetration provided in the first shield machine is When the ring is penetrated into the penetration chamber of the second shield machine, the cutter devices installed at the tips of both shield machines are rotated in opposite directions and mud is injected into the face. A ground improvement method for a face during underground welding of a shield machine, characterized by reducing the tip of a cutter device and penetrating a penetration ring into a penetration chamber after replacing earth and sand with mud while stirring.