JPH033040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a shield excavation device suitable for excavating a large cross section by the shield method.

[Prior Art] When constructing a tunnel using the shield construction method, segments are assembled into a cylindrical shape in a hole in the ground excavated by a shield excavator.

Conventionally, in order to move the shield tunneling machine forward, a shield jack is provided between the front end face of the segment assembled into a cylindrical shape and the shield tunneling machine, and the shield tunneling machine is moved forward by extending the shield jack. I'm letting you do it. In this case, the reaction force for moving the shield tunneling machine forward is received by the front end face of the segment assembled into a cylindrical shape.

[Problems to be solved by the invention] In the case of a large-section shield, the equipment thrust per shield jack becomes extremely large, and the surface pressure of the reaction force that the segments receive increases, leading to the risk of segment breakage. It was hot.

Furthermore, in the case of the conventional shield construction method, it was not possible to know whether water leaked from the segment joints after assembly was completed.

The present invention aims to provide a shield excavation device that reduces the surface pressure of the segments against the propulsive force of the shield excavation machine, and also allows the presence or absence of water leakage from the segment joints to be detected.

[Means for Solving the Problems] The present invention provides a press ring provided on the inner surface of the tail plate of a shield tunneling machine, assembled and disposed around the entire front end face of the segment, and an outer periphery of the press ring. A press ring seal provided between the inner surface of the tail plate, a tail seal provided between the inner surface of the tail plate and the outer periphery of the assembled segment, and a press ring seal and the tail seal on the outer periphery of the assembled segment. A means for supplying and discharging pressurized water between them, a main shield jack provided between the shield excavator and the press ring to advance the shield excavator, and a main shield jack that penetrates the press ring and is attached to the front of the segment assembled with the shield excavator. A shield excavation machine comprising: an auxiliary shield jack provided between the shield excavation machine and the press ring; and a press ring pulling jack provided between the shield excavation machine and the press ring to draw the press ring toward the shield excavation machine. This is a device.

[Function] In the present invention, the reaction force of the main shield jack is directly applied to the press ring, reducing the surface pressure of the segment, making it possible to perform a water leak test using pressurized water from the outside of the joint of the segment after assembly. .

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a shield tunneling machine, which is equipped with a cutter 2 on the front, and a cylindrical tail plate 3 extending rearward from its outer periphery. The earth and sand excavated by the cutter 2 is carried out by a screw conveyor 4, and a segment 5 is assembled into a cylindrical shape on the inner surface of the tail plate 3. A press ring 7 is disposed over the entire circumference of the front end surface 6 of the segment 5 assembled into a cylindrical shape. A main shield jack 8 is provided to move the main shield forward.

As shown in FIG. 2, a roller 9 is provided on the outside of the press ring 7, so that the press ring 7 can move in the front-back direction along the inner surface of the tail plate 3 without receiving much resistance. There is. A press ring seal 10 that contacts the inner surface of the tail plate 3 is attached to the outer periphery of the press ring 7, and a seal 1 that contacts the front end surface 6 of the segment 5 is attached to the rear end surface of the brace ring 7.
1 is installed.

A tube tail seal 12 is attached to the rear inner surface of the tail plate 3, and the tube tail seal 12 is connected to the segment 5 by sending fluid into the tube tail seal 12 from the air pipe 13.
It is designed so that it can be placed in close contact with the outer periphery of the A tail seal 14 is attached further to the rear of the inner surface of the tail plate 3, and a tail seal 14 is attached to the inner surface of the tail plate 3.
so that it is always in contact with the outer periphery of the

A portion between the outer periphery of the segment 5 and the inner surface of the tail plate 3, which is divided by the press ring seal 10 and the tube tail seal 12, is a water supply section 15.
A water supply pipe 16 and a drain pipe 17 are installed so as to face the water. Note that valves (not shown) are attached to each of the water supply pipe 16 and the drain pipe 17. Additionally, a relief valve (for maintaining pressure) will be installed in the middle of the drainage line.

As shown in FIG. 3, a press ring pulling jack 18 is installed between the shield excavator 1 and the press ring 7, so that the press ring 7 can be pulled toward the shield excavator 1. It's getting old. As shown in FIG. 4, an auxiliary shield jack 19 is provided between the shield excavator 1 and the front end face 6 of the segment 5, and the auxiliary shield jack 19 allows the press ring 7 to slide. Penetrating. 20 is a guide attached to the press ring 7.

FIG. 5 shows an example of the arrangement of the main shield jack 8, the press ring pulling jack 18, and the auxiliary shield jack 19. 18 and auxiliary shield jacks 19 are arranged alternately. Although FIG. 5 shows the tail plate 3 having a rectangular cross section, it can be arranged in the same manner even if it has a circular cross section. In FIG. 5, 21 is a girder, and 22 is a support.

When the main shield jack 8 is extended to move the shield excavator 1 forward, the reaction force acting on the main shield jack 8 is supported by the entire circumference of the front end face 6 of the segment 5 via the press ring 7. Therefore, the surface pressure applied to the segment 5 becomes a small value.

When digging is performed by one ring of the segment 5 from the state shown in FIG. 2 as shown in FIG. 3, the main shield jack 8 and press ring pulling jack 18 are contracted while the auxiliary shield jack 19 remains extended. , press ring 7 to shield excavator 1
pull towards. The extended auxiliary shield jack 19 functions to prevent the shield excavator 1 from retreating.

When the pressing of the press ring 7 is completed as shown in FIG. 4, the segments 5 for one ring are assembled. In this case, the auxiliary shield jack 19 is contracted by the number of pieces arranged in the portion of the segment to be inserted, and the segment 5 is inserted.

When the assembly of the segments 5 for one ring is completed, air or liquid is sent into the tube tail seal 12 from the air pipe 13 shown in FIG. The ring 7 is brought into close contact with the front end face 6 of the segment 5. and drain pipe 1
The unillustrated valve of 7 is closed, and the unillustrated valve of the water supply pipe 16 is opened to open the water supply section 15.
Supply pressure water to the inside of the tube tail seal 12, check for water leakage from the joints of the segments 5 for one ring just assembled, and if there is water leakage, make repairs, and if there is no water leakage, drain the air or liquid inside the tube tail seal 12. Pull it out, release it, and apply back pressure to the tail seal 14.
The valve of the water supply pipe 16 is closed, the valve of the drain pipe 17 is opened, the pressure in the water supply section 15 is maintained constant by the relief valve provided in the drain line, water is discharged, and the pressure applied to the tail seal 14 is Excavation is performed while reducing water leakage from the tail seal.

[Effect of the invention] The present invention has the following effects.

(i) By lowering the surface pressure of the segments against the propulsion force, damage to the segments can be prevented, as well as water leakage from the segment joints.

() It is possible to know whether there is water leakage from the segment joints under adverse conditions, improving safety and improving the working environment inside the tunnel.

() By applying back pressure to the tail seal and reducing the burden on the seal, it is possible to improve water-stopping performance and service life.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of the present invention;
4 through 4 are enlarged views of the main parts of FIG. 1, and FIG. 5 is a longitudinal sectional front view. In the figure, 1 is a shield tunneling machine, 3 is a tail plate, 5 is a segment, 6 is a front end face, 7 is a press ring, 8 is a main shield jack, 10 is a press ring seal, 12 is a tube tail seal, and 16 is a A water supply pipe, 17 a drain pipe, 18 a press ring pulling jack, and 19 an auxiliary shield jack.

Claims (1)

[Claims] 1. A press ring provided on the inner surface of the tail plate of the shield tunneling machine and arranged around the entire front end face of the assembled segment, and a press provided between the outer periphery of the press ring and the inner surface of the tail plate. means for supplying and discharging pressurized water between a ring seal, a tail seal provided between the inner surface of the tail plate and the outer periphery of the assembled segment, and a press ring seal and the tail seal on the outer periphery of the assembled segment; , a main shield jack provided between the shield tunneling machine and the press ring to advance the shield tunneling machine, and a main shield jack that passes through the press ring and is provided between the front end face of the segment assembled with the shield tunneling machine. A shield excavation device comprising: an auxiliary shield jack; and a press ring pulling jack provided between the shield excavator and the press ring to draw the press ring toward the shield excavator.