JPH0423994Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention is a shield tunnel in which a single tunnel is excavated from both ends of the tunnel using two shield machines, and the tunnels are joined in the middle. This invention relates to underground bonding equipment.

``Conventional technology'' In recent years, in order to shorten the construction period of the shield construction method for excavating tunnels in soft ground, starting piles are excavated at positions corresponding to both ends of the tunnel to be constructed, and these starting piles are A method called the underground joint method has been proposed and implemented, in which a tunnel is excavated from the pile using two shield machines, and the tunnel is completed by joining them halfway. However, since a cutting device for excavating the ground is usually installed at the tip of each of the shield machines, these two shield machines have their tips abutted against each other at the joint. It is very difficult to get even close to that level. Therefore, when joining a tunnel, it is necessary to dismantle the shield machine while leaving a predetermined distance of ground in the vicinity of the joint, and to excavate and remove the remaining ground by some means. However, connecting tunnels using the above method requires extensive earth retaining work and water stoppage work for the remaining ground, and increases both construction cost and construction period, making it extremely uneconomical.

Therefore, an underground joining device is constructed in which one of the two shield machines is provided with a cylindrical penetration ring stored in its skin plate, and this penetration ring is used to join the tunnel when joining. Recently, an underground joint method has been proposed that enables safe and reliable tunnel joints by covering the ground in the tunnel to retain earth and stop water. That is, as shown in FIG. 5, the tip of the skin plate 1a of the first shield machine 1 of the two shield machines constituting the above-mentioned underground bonding device is separated by an outer cylinder 11 and an inner cylinder 12. Along with forming heavily,
A cylindrical penetrating ring 13 is stored between the outer cylinder 11 and the inner cylinder 12, and the tip of the skin plate 2a of the second shield machine 2 is connected to the outer cylinder 21 having the same diameter as the first shield machine. A penetration chamber 23 into which the penetration ring is penetrated is formed by forming a double inner cylinder 22. And these first
When tunnels Ta and Tb are dug from both ends of the tunnel to be constructed by the second shield machines 1 and 2 and joined together, the penetration ring 13
By penetrating the tip of the penetrating ring 13 into the penetrating chamber 23 of the second shield machine 2,
By covering the ground Gi left between the first and second shield machines 1 and 2, and thereby retaining earth and water at the tunnel joint, safely and reliably join the tunnels Ta and Tb. At the same time, it becomes possible to significantly reduce the construction cost and construction period at the time of joining.

"Problems to be Solved by the Invention" By the way, in the underground joining device equipped with the above-mentioned penetration ring 13, it is not possible to create a tunnel by simply penetrating this penetration ring 13 into the penetration chamber 23 of the second shield machine 2. The water stoppage at the joint may be insufficient. Therefore, when constructing the underground joint method, in order to ensure water stoppage at the tunnel joint, a waterstop material is injected into the penetration chamber 23 before and after tunnel jointing by the penetration ring 13. By filling the penetrating ring 13 with water, the water around the penetrating ring 13 may be stopped. However, since the penetration chamber 23 of the second shield machine 2 is opened at the tip of this shield machine 2, under construction conditions such as the soil quality of the ground G, excavated earth and gravel may penetrate during excavation of the tunnel Tb. There is a risk that it may invade the inside of the chamber 23 or block it. Therefore, when the above-mentioned water-stopping material is injected, excavated soil, etc. may get mixed into the water-stopping material, which may inhibit the uniform solidification of the water-stopping material, which may reduce the water-stopping effect at tunnel joints. It was hot.

This invention was made in view of the above-mentioned circumstances, and aims to provide an underground connecting device for shield tunnels that can reliably shut off water at tunnel joints regardless of construction conditions.

"Means for Solving the Problem" In order to solve the above problem, this invention excavates the ground using a cutter device installed at the front, and excavates the ground while assembling segments for the primary lining inside. In an underground joining device for a shield tunnel, which uses two shield machines that propel the tunnel to excavate tunnels from both ends of the tunnel to be constructed and join them in the middle, the tunnel is completed. The tip of the skin plate of the shield machine is double formed by an outer cylinder and an inner cylinder, and a penetrating ring that can move freely in the front and rear direction of the shield machine is stored between the outer cylinder and the inner cylinder of the shield machine. and by forming the tip of the skin plate of the other shield machine in double form with an outer cylinder and an inner cylinder having the same diameter as the one shield machine,
A penetration chamber into which the penetration ring is penetrated is formed in this shielding machine, and a protection ring movable in the front-back direction of the shielding machine is housed in this penetration chamber, and an injection pipe whose tip opens into this penetration chamber is disposed. A shield tunnel underground joining device is constructed in which the protection ring is provided with an injection hole passing through the protection ring in the longitudinal direction of the shield machine.

``Operation'' In this design, by pulling the penetration ring into the penetration chamber and retracting the protection ring, at the same time as covering the ground at the tunnel joint, water stop material can be injected and filled into the penetration chamber through the injection pipe. This water-stopping material can reach the front of the protection ring through the injection hole drilled in the protection ring, and as a result, the water-stopping material can fill the void that is formed in front of the protection ring as the protection ring retreats. It becomes possible to fill with

"Example" Hereinafter, an example of this invention will be described with reference to FIGS. 1 to 4. In the figure, reference numeral G indicates the ground near the junction of the shield tunnel that has been excavated from both ends, and within this ground G, the first shield machine 1 is installed with a cutter device installed in the front part. 10 excavates a tunnel Ta on the right side of the paper, and the second shield machine 2 excavates the other tunnel Tb on the left side of the paper using a cutter device 20 provided at the front of the second shield machine 2. And a tunnel formed behind the first shield machine 1
The wall surface of Ta is 1 by segments 3a, 3a, . . . assembled inside this shield machine 1.
Next, the wall surface of the tunnel Tb, which is lined and similarly formed behind the second shield machine 2, is the segment 3b assembled inside this shield machine 2,
The primary lining was done by 3b,... In the above configuration, the first shield machine 1 and the second shield machine 2 are underground joints having a structure of excavating tunnels Ta and Tb from both ends of the tunnel to be constructed and joining them halfway. It constitutes a device S.

The tip of the cylindrical skin plate 1a constituting the outer shell of the first shield machine 1 is connected to an outer cylinder 11 formed to have the same diameter as the skin plate 1a, as in the conventional shield machine. The inner cylinder 12 is formed to have a smaller diameter than the cylinder 11, and the inner cylinder 12 is connected to the skin plate 1a by a partition plate 14 formed perpendicularly to the axis of the shield machine 1. connected. A penetrating ring 13 made of a cylindrical iron plate is housed between the outer cylinder 11 and the inner cylinder 12, and a penetrating ring 13 is provided at the tips of the outer cylinder 11 and the inner cylinder 12. Seal material 30, 3 such as a lip seal, U seal, O ring, etc. that closes the gap between the ring 13 and the ring 13.
0 is set.

A plurality of rods 17a, 17a, . . . extending along the axis of the shield machine 1 are protruded from the rear end of the penetrating ring 13 at intervals in the circumferential direction. These rods 17a, 17a,...
A plurality of extrusion jacks 17 are provided to penetrate the partition plate 14 provided between the outer cylinder 11 and the inner cylinder 12, and whose tips are installed at intervals on the inner surface of the skin plate 1a. , 17, . . . Further, a sliding bearing 31 such as a thrust bearing is interposed between the penetrating ring 13 and the inner cylinder 12, and with the above structure, the penetrating ring 13 can freely slide in the front and rear direction along the axis of the shield machine 1. It is configured.

On the other hand, the tip of the skin plate 2a of the second shield machine 2 is similar to that of the first shield machine 1.
It is double formed by a cylindrical outer cylinder 21 and an inner cylinder 22 having the same diameter, and the inner cylinder 22 is connected by a partition plate 24 formed perpendicular to the axis of the shield machine 2. . And these outer cylinders 21,
A space surrounded by the inner cylinder 22 and the partition plate 24 is a penetration chamber 23 into which the penetration ring 13 of the first shield machine 1 is penetrated.

A protective ring 32 having a thickness slightly thinner than the distance between the outer tube 21 and the inner tube 22 is fitted into the penetration chamber 23 . This protective ring 32 is provided with a plurality of injection holes 33, 33, . An inclined surface 34 that slopes backward is formed.
This increases the compression ability with the penetrating ring 13,
Also, smooth intake of excavated soil is being planned. At the rear end of the protective ring 32, rods 27a, 27a, . These rods 27a, 27a, . . . are provided through the partition plate 24, and the extrusion jacks 27, 27, .
...is connected to... With the above configuration, the protection ring 32 is configured to be slidable in the front and rear directions along the axis of the shield machine 2.

Further, the second shield machine 2 is provided with an injection pipe 35 whose tip is opened into the penetration chamber 23 thereof. The base end of this injection pipe 35 is connected to a water stop material manufacturing plant (not shown) installed behind the shield machine 2 or on the ground, and thereby the water stop material is introduced into the penetration chamber 23 via the injection pipe 35. It is possible to inject and fill. Here, the type of water-stop material injected through the injection pipe 35 is arbitrary and may be appropriately selected from well-known materials, but if a cement-based water-stop material such as grout is used, the tunnel joint described later will be permanently sealed. It has the effect of being constructed as a structure and improving its durability.

Further, in the figure, reference numerals 18 and 28 are provided within the skin plates 1a and 2a of the shield machines 1 and 2, respectively, at intervals in the circumferential direction, and the segments 3
Shield machines 1 and 2 with reaction force at the tips of a and 3b
Propulsion jack that propels the forward, code 15,2
5 are inner cylinders 12 and 2 of shield machines 1 and 2, respectively.
This is a partition plate provided so as to close off the inside of 2.
In this embodiment, the cutter devices 10 and 20 for excavating the earth are formed to have a slightly smaller diameter than the inner cylinders 12 and 22, and the shaft bodies 19 and 29 are connected to the partition plates 15 and 2.
These cutter devices 1
Cutters 10a and 20a are provided on the peripheral edges of shield machines 1 and 2, respectively, and are extendable and retractable in the radial direction of shield machines 1 and 2. In addition, these cutter devices 10, 20
are configured to be movable along the axes of the shield machines 1 and 2, so that the cutter devices 10 and 20 can be stored in the inner cylinders 12 and 22 during tunnel joining.

Next, a method for joining tunnels using the underground joining apparatus S having the above configuration will be described.

First, as shown in Figure 1, shield machines 1 and 2
From both ends of the tunnel using
The primary lining is performed by assembling segments 3a and 3b on the walls of tunnels Ta and Tb while excavating Tb. At this time, it is preferable that the diameters of the tunnels Ta, Tb to be excavated be made at least the same diameter as the outer cylinders 11, 21 by extending the cutter parts 10a, 20a of the cutter devices 10, 20. Note that the penetration chamber 23 of the protective ring 32 of the second shield machine 2
The protective ring 32 can be placed in any position within the tunnel Tb, but by placing the protective ring 32 in front of the penetration chamber 23 when excavating the tunnel Tb, it is possible to prevent excavated earth and gravel from entering the penetration chamber 23. can do.

Then, at the joint of the tunnel, these shield machines 1 and 2 are installed at a predetermined length of ground Gi (approximately 30 cm to 1 m).
After shortening the extended cutter parts 10a and 20a to their original lengths, the cutter devices 10 and 20 are housed in the inner cylinders 12 and 22, and the propulsion jack 18 , 28, . . . , the shield machines 1 and 2 are brought close to each other to the extent that the front ends of the shield machines 1 and 2 almost come into contact with each other (FIG. 2).

Next, when the protection ring 34 is located deep in the penetration chamber 23, the protection ring 32 is slid to the front part of the penetration chamber 23 by driving the pusher jacks 27, 27, . Earth, sand and gravel that have entered the penetration chamber 23 are discharged to the outside. In this state, by driving the extrusion jacks 17, 17, . Figure 3).

Further, while the extrusion jacks 17, 17, . . . continue to extrude the penetrating ring 13, the extrusion jacks 27, 27, . Slide the protective ring 32 backward while keeping the penetrating ring 13 in contact with the penetrating chamber 2.
3 Pull it all the way in. That is, this penetrating ring 13 covers the ground Gi remaining at the tunnel junction between the shield machines 1 and 2. Also,
Simultaneously with this drawing operation of the penetration ring 13, the water stop material 36 is injected and filled into the penetration chamber 23 through the injection pipe 35. At this time, as the protective ring 32 retreats, a void is formed in front of the protective ring 32, but as described above, the protective ring 32 has an injection hole 3.
3, 33, ... are formed, so the water stop material 3
6 reaches the front of the protection ring 32 through the injection holes 33, 33, .

Thereafter, the cutter devices 10 and 20 are disassembled and removed, the partition plates 15 and 25 are cut and removed, and both ends of the penetration ring 13 are
Weld it to 2 and fix it. And shield machine 1,
By pouring concrete including the thickness of the secondary lining on the inner surfaces of the skin plates 1a and 2a of No. 2, the tunnel joint is lined, thereby completing the construction of the tunnel joint.

Therefore, according to the underground joining device S described above, the excavated earth and sand etc. in the penetration chamber 23 can be completely removed by the protection ring 32 prior to joining the tunnels Ta and Tb, and the penetration ring 13 By drawing the gas into the penetration chamber 23 and retracting the protection ring 32, at the same time the work of covering the ground Gi at the tunnel junction is carried out, the penetration chamber 23 is
When the water-stopping material 36 is injected and filled inside, the water-stopping material 36 reaches the front of the protection ring 32 and even the ground Gi at the tunnel joint through the injection holes 33, . . . made in the protection ring 32. can be done. That is, as the protective ring 32 retreats, the void formed in front of the protective ring 32 can be filled with the water stop material 36, so that excavated earth and gravel will not enter the penetration chamber 23 even when the tunnel is connected. This makes it possible to ensure water stoppage during tunnel joining.

Note that the shield tunnel underground joint device S of this invention is not limited to the shapes and dimensions of its constituent members or surrounding equipment, etc., to the above embodiments, and may vary depending on the installation location, construction conditions, or Various changes can be made based on design requirements, etc.

``Effects of the invention'' As explained in detail above, according to this invention, two shield machines are used to excavate tunnels from both ends of the tunnel to be constructed and join them in the middle. In the underground joint equipment of the shield tunnel to be completed,
The tip of the skin plate of one of the shielding machines is formed double by an outer cylinder and an inner cylinder, and a penetrating member is provided between the outer cylinder and the inner cylinder of the shielding machine so as to be movable in the front-rear direction of the shielding machine. By storing the ring and forming the tip of the skin plate of the other shield machine double with an outer cylinder and an inner cylinder having the same diameter as the one shield machine, the penetrating ring can be attached to this shield machine. forms a penetration chamber into which is penetrated,
A protection ring that is movable in the longitudinal direction of the shield machine is housed in this penetration chamber, and an injection pipe whose tip opens into the penetration chamber is installed, and the protection ring is inserted into the protection ring in the longitudinal direction of the shield machine. Since we configured an underground joint device for a shield tunnel in which a penetrating injection hole is drilled, by pulling the penetration ring into the penetration chamber and retracting the protection ring, we can perform the work of covering the ground at the tunnel joint. At the same time, by injecting and filling the penetration chamber of the other shield machine with a water stop material through the injection pipe, this water stop material can reach the front of the protection ring through the injection hole. Therefore, according to this idea,
At the time of tunnel jointing, we prevent water from entering the tunnel by filling the void that forms in front of the protective ring as it retreats with water-stopping material. It becomes possible to ensure reliability regardless of conditions.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an underground connecting device for a shield tunnel, which is an embodiment of this invention, in which Figure 1 is a sectional view showing the whole, and Figure 2 is a penetrating ring and a penetrating A sectional view showing an enlarged view of the vicinity of the room, FIGS. 3 and 4 are process diagrams for explaining the underground joining method according to the same embodiment, and FIG. 5 is a sectional view showing a conventional underground joining device. It is. G...Ground, S...Underground joining device, 1...First
shield machine (one shield machine), 2...2nd
shield machine (other shield machine), 1a, 2a
... Skin plate, 11, 21 ... Outer cylinder, 1
2, 22... Inner cylinder, 13... Penetration ring, 23...
...Penetration chamber, 32...Protection ring, 33...Injection hole, 35...Injection pipe, 36...Water stop material.

Claims (1)

[Scope of utility model registration request] Two shield machines are used to excavate the ground using a cutter device installed at the front, and propel the machine underground while assembling segments for the primary lining inside.
An underground connecting device for shield tunnels that completes a tunnel by excavating tunnels from both ends of a tunnel to be constructed and joining them midway, wherein the tip of the skin plate of one of the shield machines is The shield machine has a double structure with an outer cylinder and an inner cylinder, and a penetrating ring that is movable in the front and back direction of the shield machine is housed between the outer cylinder and the inner cylinder, and the other In the shield machine, the tip of the skin plate is formed double by an outer cylinder and an inner cylinder having the same diameter as the one shield machine, thereby forming a penetration chamber into which the penetration ring is penetrated. A protection ring that is movable in the front-back direction of the shielding machine is housed in the penetration chamber, and an injection pipe whose tip opens into the penetration chamber is installed, and the protection ring also includes a shielding ring. An underground connecting device for a shield tunnel, characterized in that an injection hole is drilled through the machine in the longitudinal direction.