JPH0588356B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" This invention is a method of sliding and protruding the inner skin plate of a double-formed skin plate to the outer skin of another shielding machine. This invention relates to a water-stopping structure at a joint in an underground joint type shield machine that is capable of penetrating into the plate.

"Prior Art" The applicant previously developed the "Underground Connection Method for Shield Tunnels" (Japanese Patent Application No. 102,859/1986).

As shown in FIGS. 5 and 6, the excavator excavates the ground G using a cutter device 10 installed at the front, while assembling segments 9 for the primary lining inside the machine and propelling it underground. This is an underground joining method for a shield tunnel when two shield machines are used to complete a tunnel by excavating tunnels Ta and Tb from both ends of the tunnel to be constructed and joining them midway, A tunnel is excavated by using two shield machines 1 and 2 as a set, each having a skin plate whose tip end is double formed by an inner skin plate (inner cylinder) 3 and an outer skin plate (outer cylinder) 4. process, and immediately before the end of the tunnel excavation process, the inner skin plate 3b of one of the two shield machines 1 and 2 is moved backward, and the inner skin plate 3a of the other shield machine 1 is moved to the joint. Jiyama Gi
The inner skin plate 3a is moved forward while excavating, and the two shield machines 1,
2, and after this step, the two shield machines 1,
2, the shield machine body is disassembled with the skin plates 3 and 4 remaining, and furthermore, concrete is poured on the inner surfaces of the skin plates 3 and 4 to line the wall surface of the joint part. After dismantling the shielding machine main body, the inner skin plate 3a of the shielding machine 1 is connected to the outer skin plate 4 as a sleeve-shaped lap joint connecting the ends of the opposing outer skin plates 4a and 4b with a gap between them.
The water remains on the inner circumferential surface of the tunnel, thereby making it possible to easily and reliably stop water at the tunnel joint without requiring much construction time. It has excellent effects such as:

The water stop structure for sealing between the inner skin plate and the outer skin plate of the shielding machine 1 for carrying out the above construction method was as shown in FIG. This is similar to the seal conventionally used for the rear end seal (so-called tail seal) of shield machines, and is in contact with the outer circumferential surface of the inner skin plate 3a and the inner circumferential surface of the outer skin plate 4a. In addition, a water stop brush 5 made of a wire brush, a nylon brush, a thin steel plate, or the like was attached so as to be slidable. In addition,
Reference numeral 11 designates an injection pipe for injecting a water-stopping chemical into the vicinity of the joint when the joint is completed.

"Problems to be Solved by the Invention" By the way, in the above-mentioned underground joining method for shield tunnels, the inner skin plate 3a of one of the shield machines 1, 1, of the two closely facing shield machines 1, 2 is slid. The sliding inner skin plate 3a is inserted into the outer skin plate 4b of the other shield machine 2, but in actual joining, the sliding inner skin plate 3a and the other shield machine 2 that receives it are inserted into the outer skin plate 4b of the other shield machine 2. There is a variation of 0 to 100 mm between the outer skin plate 4b and the outer skin plate 4b. Because of this,
When the inner skin plate 3a penetrates the outer skin plate 4b, if the water stop brush 5 attached to the outer periphery of the inner skin plate 3a is damaged, or if the distance is as large as 100 mm, the water stop brush 5 and the outer skin plate 4b may not come into contact with each other, and there is a possibility that the water-stopping performance of the joint portion cannot be ensured. Also, suppose that the interval 〓 is the inner skin plate 3a.
Even if the skin plate 3a is approximately 50 mm around the entire circumference, the skin plate 3a when dismantling the shield machine
There is a concern that the water-stopping performance may deteriorate due to the bending deformation of the
There were some points that needed improvement.

"Means for Solving the Problems" Therefore, in order to solve the above problems, the present invention has the following features:
The tip portion is formed double by an inner skin plate and an outer skin plate, and by sliding the inner skin plate forward and protruding, it is possible to connect to the tip portion of another shield machine that is closely opposed underground. In order to provide a water-stopping structure for a joint in an underground joint-type shield machine, a flexible tube that can be expanded under pressure is provided along with a waterstop brush on the outer periphery of the inner skin plate, and the flexible tube is not connected to the stopper. It was assumed that it was in contact with the inner peripheral surface of the water brush.

"Function" The flexible tube expanded under pressure has elasticity and acts as a cushion for the water stop brush attached thereto. This allows the water stop brush to flexibly respond to uneven connections when connecting the shield machine.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In the figure, what is indicated by the symbol 1 as a whole is
This is a shield machine that excavates and propels the earth. The shield machine 1, like a general shield machine, protects its interior from the earth pressure of the ground G with a cylindrical skin plate and propels excavation with a cutter device 10a at the front end. The skin plate is provided with double layers.
That is, the original skin plate is an outer skin plate 4a, and the inner skin plate 3a, which is integrated with the cutter device 10a, is present inside the tip of the outer skin plate 4a. This inner skin plate 3a can move forward together with the cutter device 10a while the outer skin plate 4a is stopped. In other words, the inner skin plate 3a can protrude more forward than the front end of the outer skin plate 4a.

On the contrary, this shield machine 1 operates with the cutter device 10b in a state where the outer skin plate 4b is stopped.
Another shield machine 2 that can only retreat
used with When these two shield machines 1 and 2 come close to each other, the shield machine 2
The cutter device 10b is moved backward, and the inner skin plate 3a of the shield machine 1 is advanced together with the cutter device 10a to penetrate into the outer skin plate 4b of the opposing shield machine 2.

The inner skin plate 3 of such a shield machine 1
As described above, a is attached to the outer skin plate 4a so that it can move forward and smoothly penetrate into the skin plate 4b of the opponent shield machine 2.
The structure is such that a gap of around 100mm is formed around the entire circumference between the two. A plurality of rows (two rows in the figure) of water stop brushes 5 are attached to the outer peripheral surface of the inner skin plate 3a in the circumferential direction, and a lower part of the water stop brush 5 in the front row is made of hard rubber. A flexible tube 6 is attached.

The water stop brush 5 is made of, for example, a nylon brush, a wire brush, or a thin steel plate, and in this embodiment, it is a wire brush. In the embodiment, the water stop brush 5 in the front row is
Only its front end is fixed to the inner skin plate 3a, and the rear part is fixed to the inner skin plate 3a.
It can be freely separated from a. In other words, the flexible tube 6 is provided in a portion of the water stop brush 5 that can be separated from the inner skin plate 3a, and is sandwiched between the water stop brush and the inner skin plate. Further, since the water stop brush 5 forming the second row is not provided with the flexible tube 6 as described above, an adjustment ring 13 is provided between it and the inner skin plate 3a. As a result, the outer periphery of these two rows of water-stop brushes 5 is connected to the guide plate 1 on the inner periphery of the outer skin plate 4a.
2.

In this embodiment, the flexible tube 6 is made of hard rubber as described above, and has a so-called floating ring shape with a closed tubular space formed inside. A pressure regulating tube 7 for supplying and recovering compressed air or working oil to the flexible tube 6 is led through the inner skin plate 3a. As a result, the flexible tube 6 can expand and contract in the radial direction by supplying compressed air (or oil) and releasing pressure.

Further, an injection port of an injection pipe 11 for injecting a water-stopping chemical solution is opened on the outer circumferential surface of the inner skin plate 3a.

Next, the water-stopping action of the shield machine 1 having the water-stopping structure of the joint section configured as described above will be explained with reference to FIGS. 2 to 4.

Now, the shield machine 1 is moving forward while excavating the ground G, and is facing the shield machine 2, which is also excavating and pushing from the opposite side, with several hundred of the ground Gi left behind.

Once the above condition is reached, the cutter device 10b of the shield machine 2 is moved back as shown in FIG.

Next, as shown in FIG. 3, the cutter device 10a of the shield machine 1 is advanced while excavating the ground Gi.
It penetrates into the outer skin plate 4b of the shield machine 2. At this time, the inner skin plate 3a is also penetrated into the skin plate 4b together with the cutter device 10a, but at this point the flexible tube 6
is already pressurized. That is, the inner skin plate 3a expands in the radial direction, presses the water stop brush 5 from the inside, and causes the outer skin plate 3a to expand.
It is assumed that the guide plate strongly contacts the inner surface (guide plate 12) of a. By the way, the bonding type shield machine allows misalignment between both shield machines of up to 5 cm in the diameter direction and 1 degree in the bending angle, but for example, if the maximum misalignment within the above range is Even if the gap between the outer skin plate 4b of the shield machine 2 and the inner skin plate 3a of the shield machine 1 penetrating therein is extremely uneven, water can be stopped by the action of the flexible tube 6. The brush 5 can flexibly respond to this.
That is, in areas where the gap is large, the expansion of the flexible tube 6 presses the water stop brush 5 from the back surface, so the water stop brush 5 is pressed against the outer skin plate 4b.
Since the flexible tube 6 does not reach the inner surface and can be compressed in places where the gap is small,
Since the water stop brush 5 is not forced to slide in a pressed state in a situation where it escapes to the flexible tube 6 side, there is no chance of it being damaged or falling off.

The cutter device 10a and the inner skin plate 3a of the shield machine 1 are penetrated to the innermost part of the shield machine 2 as shown in FIG. 4, but even during the penetration, the outer skin plate 4b and the inner skin plate 3a change. During this time, the flexible tube 6 expands and contracts in accordance with the time, and the water stop brush 5 is surely pressed against the inner surface of the outer skin plate 4b, thereby completely stopping water.

Thereafter, a water stop chemical solution is injected into the area around the water stop brush 5 and the surrounding ground through the injection pipe 11, and after it hardens, the shield machine 1 and the shield machine 2
can be dismantled with the skin plates 3 and 4 remaining.

When the shield machine body is disassembled, the front skin plate 3a that connects the shield machine 1 and the shield machine 2 and closes the space between them may be deformed such as distortion or bending. Even if the flexible tube 6 changes, the flexible tube 6 can keep the water-stop brush constantly pressed against the inner surface of the outer skin plate by following the change, and can maintain high water-stop properties.

In this embodiment, the front end of the water stop brush 5 in the front row is fixed to the inner skin plate 3a, and the rear part thereof is fixed to the inner skin plate 3a.
Although it is assumed that the water stop brush 5 can be spaced apart from a, the structure of the water stop brush 5 is not limited to that of this embodiment.
For example, it may be attached integrally to the outer peripheral surface of the flexible tube 6 completely independently from the inner skin plate 3a.

"Effects of the Invention" As explained above, the present invention has a distal end portion that is double formed by an inner skin plate and an outer skin plate, and the inner skin plate is slidably protruded forward, so that it can be inserted into the ground. A flexible tube that can be expanded by pressurization is installed on the outer periphery of the inner skin plate to provide a water-stopping structure at the joint in an underground joint-type shield machine that can be connected to the tip of another shield machine that faces closely. Since the flexible tube is provided together with the brush and is in contact with the inner circumferential surface of the water-stopping brush, the flexible tube expanded under pressure acts as a cushion for the water-stopping brush attached thereto. Even if the distance between the water stop brush and the joint where the water stop brush penetrates is uneven, it can be flexibly accommodated, and the distortion of the skin plate when the shield machine body is disassembled can be avoided. It is possible to keep the water-stopping brush always pressed against the water-stopping surface such as the outer skin plate by following changes caused by bending and deformation, and the two shield machines are not necessarily joined under favorable conditions. Even under such circumstances, it exhibits excellent effects such as extremely high water-stopping properties.

[Brief explanation of the drawing]

Fig. 1 is a partial side sectional view of a water stop part of a shielding machine showing an embodiment of the present invention, and Figs. Figures 5 and 6 are side sectional views showing the front parts of shield machine 1 and shield machine 2, respectively, to explain the "underground joint method for shield tunnels." FIG. 3 is a partial side sectional view showing a conventional example. 1...Shield machine, 2...Shield machine, 3,3
a, 3b...inner skin plate, 4, 4a, 4b
...Outer skin plate, 5...Water stop brush, 6...
...Flexible tube.

Claims (1)

[Claims] 1 The tip portion is formed double by an inner skin plate and an outer skin plate, and by sliding the inner skin plate forward and protruding, it can be connected to the tip portion of another shield machine that is close to and facing the ground. A water-stopping structure for a joint in an underground joint-type shield machine, in which a flexible tube that can be expanded by pressurization is provided on the outer periphery of the inner skin plate together with a waterstop brush, and A water stop structure for a joint in an underground joint type shield machine, characterized in that the pipe is in contact with an inner circumferential surface of the water stop brush.