JP3080888B2 - Water-stop structure of entrance part in shield method and water-stop method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping structure for an entrance section in a shield method and a water stopping method using the same.

[0002]

2. Description of the Related Art In a shield machine, the outer diameter of a cutter disk is made slightly larger than the outer diameter of a skin plate due to the limitation of processing accuracy. Therefore, when the shield machine starts from the shaft to the ground, water, earth and sand, etc., flow into the shaft from the gap due to the difference in the outer diameter. For this reason, an entrance packing generally indicated by reference numeral EP as shown in FIGS. 12 to 14 is used to prevent inflow of water, earth and sand. The entrance packing EP includes a doughnut-shaped rubber packing R concentric with the skin plate P and the outer periphery of a shield machine (hereinafter, a case of a single circle) M, a hinge H, and a plurality of rotatable rocks in the ground G direction. And the flapper F, and is attached to the inner peripheral edge of the entrance E of the shaft V. In addition, the code | symbol CD in a figure is a cutter disk.

Without the flapper F, a rubber packing R
In this case, as shown in FIG. 15, after the shield machine M has left the ground G, the water pressure Wp acts on the rubber packing R and the rubber packing R is inverted to the segment S side as shown in FIG. Then, water flows into the shaft V. Note that reference numeral TS in the figure is a tail seal.

[0004]

The conventional entrance packing EP also has a structure in which the rubber packing R and the skin plate P seal while always sliding. for that reason,
Water leaks easily. Further, when the rubber packing R passes through the boundary between the skin plate P and the segment S, the outer diameter of the segment is smaller than the outer diameter of the skin plate P due to the structure of the shield machine, so that a so-called step-down occurs, and In addition, an accident that earth and sand flow into the shaft V is likely to occur. SUMMARY OF THE INVENTION An object of the present invention is to provide a water stopping structure of an entrance part in a shield method and a water stopping method using the same in a shielding method for reliably sealing the entrance part when the shield machine starts.

[0005]

According to the structure of the present invention, there is provided a sediment provided on a ground-side peripheral edge of the entrance at the entrance formed in the ground when the shield machine starts from the shaft to the ground. A first packing in the form of a hollow donut provided on the inner periphery of the filter and the entrance near the ground, and a second packing similar to the first packing provided on the shaft-side periphery of the entrance; There is provided a means for injecting and discharging a working fluid for the two packings and a means for draining water trapped between the first and second packings.

Further, according to the present invention, the earth and sand filter is composed of a plurality of comb-shaped metal members hinged to the periphery of the entrance portion by a hinge, and a wire net attached to the plurality of comb-shaped metal members. .

According to the present invention, the earth and sand filter comprises an annular brush and a metal for preventing the brush from turning over to the shaft.

Further, according to the present invention, the first and second hollow donut-shaped packings are provided with a contracted shape holding means for holding the packing in a contracted shape.

Further, according to the present invention, the contracted shape holding means is constituted by a bellows-shaped peripheral wall whose original shape is contracted.

Further, according to the present invention, the contracted shape holding means is constituted by a plurality of cylinders interposed between the packing and the entrance.

The method according to the present invention comprises a first packing expanding step of injecting a working fluid into the first packing and expanding the packing to seal between the first packing and the skin plate.
In the sealed state by packing, the first packing elastically deforms the shield machine, the sealing surface stops the water while following the movement of the shield machine, and the second packing faces the sink plate without causing lateral deformation. A second packing expansion step of injecting a working fluid into the second packing, sealing between the packing and the segment, and draining water trapped between both packings; The first packing shrinking step of discharging the working fluid of the first packing, shrinking the packing to release the seal with the skin plate, digging the shield machine, and reaching the rear end of the skin plate, and the second packing When the skin plate leaves the entrance, the first step is to excavate the skin plate away from the skin plate to the position facing the segment. And a start completion step of sealing between the segments to expand the Kkingu.

According to the present invention configured as described above,
When the first packing reaches the rear end of the skin plate, the first packing reaches the rear end of the skin plate, and the second packing expands to seal between the front ends of the segments. After draining the water trapped in between, the first packing is contracted and the shield machine is dug to move the first packing from the skin plate to the segment side. The skin plate other than the step-down portion can also be stopped by following the water within the lateral elasticity limit, that is, the water can be stopped alternately in a so-called scaleworm-type.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In these drawings, FIG.
The same reference numerals are given to the portions corresponding to and the duplicate description will be omitted. In FIG. 1, the entrance E of the shaft V
A soil filter indicated by the reference numeral 1 is provided on the periphery of the ground G side of the ground. A first packing 10 and a second packing 20 are provided. The two packings 10 and 20 are provided with injection and discharge means 19 and 29 for injecting and discharging a working fluid such as air, water, oil, and the like, respectively. Valve 8
Is provided.

In FIG. 6, a sand filter 1 includes a plurality of comb-shaped metal members 2 pivotally connected to a periphery of a ground G side of an entrance portion E by a hinge 3 and bent toward the ground G side. And a wire mesh 4 attached to the entrance section E side.

FIG. 7 shows another embodiment of the earth and sand filter. This earth and sand filter 1A has an annular wire brush 5A.
And a metal member 6 for preventing reversal of the wire brush 5 toward the shaft V side.

8 and 9, the first packing 1
Taking 0 as an example, the original form of the packing 10 (FIG. 8)
Is a bellows-like peripheral wall 11 which is a contracted state holding means;
2 and a bottom portion 13, and an injection / discharge means 19 is connected to the top portion 12. Then, in a state where the working fluid is discharged, as shown in FIG. 8, the working fluid is held in a contracted state by the bellows-shaped peripheral wall 11. On the other hand, when the working fluid is injected, FIG.
As shown in FIG. 7, the peripheral wall 11A expands, and the bottom 13 seals between the skin plate P and the segment S.

FIGS. 10 and 11 show another embodiment of the packing, wherein the contracted state holding means is shown in FIG. 11 when expanded when the working fluid is discharged from the main body 14 of the first packing 10A. This is an example in which the main body 14A is constituted by a plurality of cylinders 15 interposed between the main body 14 for lifting up as shown in FIG.

Next, the mode of water stoppage will be described.

(1) First Pack Expansion Step (FIG. 1) A working fluid is injected into the first packing 10 by the injection and discharge means 19, and the packing 10 is expanded to expand the skin plate P
Seal between

(2) Excavation process (FIG. 2) In the sealed state by the first packing 10, the shield machine M
The first packing 10 reaches the rear end of the skin plate P, and the second packing 20 digs to a position away from the skin plate P and facing the segment S. During this excavation, the first packing 10 is sheared and deformed by friction with the skin plate P so that the inner edge extends toward the ground G side as shown in the figure, thereby securely sealing between the first packing 10 and the skin plate P.
In addition, the earth and sand filter 1 has a role of preventing earth and sand and the like from entering between the first packing 10 and the skin plate P, thereby preventing a decrease in sealing performance.

(3) Second Pack Expansion Step (FIG. 3) The working fluid is injected into the second packing 20 by the injection / discharge means 29, and the packing 20 is expanded to seal the space between the segments S and drain the water. The on-off valve 8 of the means 7 is opened to drain the water trapped between the packings 10, 20.

(4) First Packing Shrinking Step (FIG. 4) The working fluid in the first packing 10 is discharged, and the hacking 10 is shrunk to break the seal with the skin plate.

(5) Start Completion Step (FIG. 5) When the shield machine M is dug and the skin plate P leaves the entrance E, the first packing 10 is expanded and the second packing 10 is expanded.
A seal is made between the packing 20 and the segment S.

[0024]

As described above, the present invention is constructed as described above, so that a plurality of packings can be prevented from stepping down due to expansion and contraction of the packings and can be reliably sealed with the entrance when the shield machine starts. Can be.

[Brief description of the drawings]

FIG. 1 is a side sectional view illustrating a first packing expansion step showing one embodiment of the present invention.

FIG. 2 is a side sectional view for explaining a digging step.

FIG. 3 is a side sectional view illustrating a second packing expansion step.

FIG. 4 is a side sectional view illustrating a first packing contraction step.

FIG. 5 is a side sectional view for explaining completion of starting.

FIG. 6 is a perspective view showing the earth and sand filter of FIG. 1;

FIG. 7 is a perspective view showing another embodiment of the earth and sand filter.

FIG. 8 is a side sectional view showing a first packing of FIG. 1 in a contracted state.

FIG. 9 is a drawing showing an expanded state of FIG. 8;

FIG. 10 is a drawing corresponding to FIG. 8, showing another embodiment of the first packing.

11 is a drawing corresponding to FIG. 9 of the embodiment of FIG. 10;

FIG. 12 is a side sectional view showing an example of a conventional entrance packing.

FIG. 13 is a view as viewed in the direction of the arrow X in FIG. 12;

FIG. 14 is a view showing a state at the time of starting in FIG. 13;

FIG. 15 is a side cross-sectional view illustrating a conventional rubber packing alone.

FIG. 16 is a view showing a state where the rubber packing of FIG. 15 is inverted.

[Explanation of symbols]

 CD: Cutter disk E: Entrance part EP: Entrance packing F: Flapper G: Ground mountain H: Hinge M: Shield machine P: Skin plate R: Rubber packing S: Segment TS: Tile seal V: Vertical shaft 1, 1A: Earth filter 2 ... Comb shaped metal 3 ... Hinge 4 ... Metal 5 ... Wire brush 6 ··· Reversal prevention metal 7 ··· Drainage means 8 ··· Opening and closing valve 10, 10A ··· First packing 11, 11A ··· Bellows-like peripheral wall 12 ··· Top 13 ··· Bottom 14. 14A ・ ・ ・ Main body 15 ・ ・ ・ Cylinder 19, 29 ・ ・ ・ Injection / ejection means 20 ・ ・ ・ Second packing

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuji Ikezoe 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Tatsuro Tamai 1-chome Moto-Akasaka, Minato-ku, Tokyo No. 2 Kashima Construction Co., Ltd. (56) References JP-A-8-42708 (JP, A) JP-A 8-82188 (JP, A) Japanese Utility Model Application No. 52-160224 (JP, U) (58) Surveyed fields (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (7)

(57) [Claims] An entrance portion formed in a ground when a shield machine starts from a shaft to the ground, wherein a sediment filter provided on a ground-side periphery of the entrance portion and a ground near the entrance portion. A hollow donut-shaped first packing provided on the periphery and a second packing similar to the first packing provided on the shaft-side periphery of the entrance, and a means for injecting and discharging a working fluid into and from the first and second packings; And a means for draining water trapped between the first and second packings. 2. The sediment filter according to claim 1, wherein the earth and sand filter comprises a plurality of comb-shaped hardware hinged to a periphery of the entrance portion, and a wire mesh attached to the plurality of comb-shaped hardware. Waterproof structure at the entrance of the shield machine. 3. The water blocking structure for an entrance part of a shield machine according to claim 1, wherein the earth and sand filter comprises an annular brush and a metal for preventing the brush from reversing toward the shaft. 4. The water blocking structure for an entrance section of a shield machine according to claim 1, wherein the first and second hollow donut-shaped packings are provided with a contracted shape holding means for holding the packing in a contracted shape. 5. The waterproof structure of an entrance part of a shield machine according to claim 4, wherein the contracted shape holding means is constituted by a bellows-shaped peripheral wall whose original shape is contracted. 6. The waterproof structure for an entrance part of a shield machine according to claim 4, wherein the contracted shape holding means is constituted by a plurality of cylinders interposed between the packing and the entrance part. 7. A first packing expanding step of injecting a working fluid into the first packing and expanding the packing to seal a gap between the first packing and the skin plate, and the first packing of the shield machine in a sealed state by the first packing. Elastically deforms, the sealing surface stops the water while following the movement of the shield machine,
A digging process in which the second packing digs up to a position facing the skin plate without lateral deformation, injecting a working fluid into the second packing, sealing between the packing and the segment, A second packing expansion step of draining water trapped in between, a first packing contraction step of discharging the working fluid of the first packing, contracting the packing to release a seal with the skin plate, and a shielding machine. The excavation process of digging and reaching the rear end of the skin plate, where the second packing digs away from the skin plate to a position facing the segment, and the first when the skin plate leaves the entrance section.
A start completion step of inflating the packing to seal the space between the segments, and a water stopping method using the water stopping structure of the entrance part in the shield method.