JP2001182476A - Entrance seal device for drift excavation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly prevent mud water from flowing out of a peripheral surface of a level-driving machine in the case of drilling a drift in a natural ground. SOLUTION: An entrance seal device for a drift excavation machine to closely attach a ring seal plate 1 in a ring form while deflecting it in the drilling direction on a peripheral surface of the columnar excavating machine 3 on a front stage in the drilling direction and to closely attach a ring seal brush 2 in a ring form while deflecting it in the drilling direction on the peripheral surface of the columnar drift excavating machine 3 on a rear stage in the drilling direction is arranged so as to closely attach a head end part of the ring seal plate 1 and a head end part of the ring seal brush 2 by shifting their positions longitudinally by interposing a spacer 10 between a base end part of the front stage ring seal plate 1 and a base end part of the rear stage ring seal brush 2, and a ring cut off material filling space 21 is formed between the front stage ring seal plate 1 and the rear stage ring seal brush 2 by interposing the spacer 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an entrance seal device used for excavating a horizontal tunnel for burying a wiring pipe or a sewer pipe underground by an excavator.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional entrance seal device for a tunnel excavator has an annular seal plate 1 which is annularly disposed so as to protrude inward at a front end thereof, and protrudes inwardly at a front end. The annular seal brush 2 and the annular seal brush 2 are arranged concentrically, and the annular seal brush 2 is superimposed on the annular seal plate 1 so that the annular seal brush 2 and the annular seal plate 1 are columnar. The circumferential surface of the excavator 3 is bent in the excavation direction and is closely contacted in an annular shape, thereby preventing leakage of muddy water from the entrance of the horizontal shaft.

[0003]

However, in the entrance seal device for a tunnel excavator, as shown in the drawing,
The distal end of the annular seal brush 2 and the distal end of the annular seal plate 1 overlap and bend, causing most of the annular seal plate 1 to be separated from the peripheral surface of the excavator 3 and significantly reducing the sealing function of the seal plate 1. have.

When the excavator 3 excavates and the rear end of the excavator protrudes from the entrance seal device, the seal brush unit 4 holding the annular seal brush 1 is removed, and the excavator 3 is moved to the exit side of the tunnel. Although a method of assembling and reusing the installed annular seal plate to the seal plate unit 5 having the installed annular seal plate has been adopted, when such a method is adopted, as described above, the annular seal brush 2 and the annular seal plate 1 There is a problem that it is difficult to remove the excavator because it bites into the excavator 3 circumferentially.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems appropriately, and to properly exert the respective sealing mechanisms by the annular sealing plate and the annular sealing brush, and also to provide a sealing function by a waterproof material. Accordingly, there is provided an entrance seal device for a tunnel excavator capable of achieving a sound water stopping function.

As means for this, a spacer is interposed between the base end of the preceding annular seal plate and the base end of the subsequent annular seal brush, and the distal end of the annular seal plate and the distal end of the annular seal brush are interposed. Are arranged so as to be closely shifted to the peripheral surface of the excavator by shifting the position back and forth, and an annular waterproof material filling space is formed between the front annular seal plate and the rear annular seal brush by the spacer. Of the entrance seal device for a tunnel excavator.

As a result, the individual sealing functions of the front-stage annular seal plate and the rear-stage annular seal brush can be properly exerted, and the problem that the removal of the unit having the annular seal brush becomes difficult is solved. In addition to the water-stopping function of both, the water-stopping function of the water-stopping material filled in the water-stopping material filling space is added, so that a highly reliable water stopping purpose can be achieved synergistically.

[0008] Further, a rear-stage annular seal plate is disposed at the rear end of the rear-stage annular seal brush so as to protrude inward at a rear end thereof in the excavation direction, and is bent toward the peripheral surface of the excavator in the excavation direction. Along with being in close contact with the ring, a spacer different from the above is interposed between the base end of the second-stage annular seal plate and the base end of the second-stage annular seal brush, and the distal end of the second-stage annular seal plate and the second-stage annular seal brush are interposed. The front end portion is arranged so that the position is shifted back and forth so that the close contact can be achieved, and the space between the rear-stage annular seal plate and the rear-stage annular seal brush is filled with another annular water-blocking material filling space by the spacer. To form Therefore, the water-stopping material filling space is arranged in two stages in the front and rear stages, and the water-stopping function is further improved.

The spacer is made of, for example, an elastic rubber material.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

As shown in FIGS. 2 to 4, the proximal end (outer peripheral end) of the front annular seal plate 1 is fastened between the first ring plate 6 and the second ring plate 7 with a bolt nut or the like. (Inner peripheral end) is turned inward, and this is integrally attached to the end surface of one end opening portion of the box frame 8 with the first ring plate 6 to form the seal plate unit 5.

Alternatively, the base end of the front annular seal plate 1 is fastened between the rear plate around the box frame 8 and the second ring plate 7 without using the first ring plate 6 by means of bolts and nuts.

The seal plate unit 5 is attached to the entrance side wall of the horizontal tunnel to be excavated in the ground 20 with the end of the cylindrical box frame 8 opposite to the annular seal plate 1.

The front-stage annular sealing plate 1 is, as shown in FIG.
A thin annular synthetic resin plate 1a is superimposed on a thick annular rubber plate 1b, and an opening smaller in diameter than the outer diameter of the columnar excavator 3 is formed at the center. The two members 1a and 1b are bent while being forcibly widened in the direction of propulsion of the excavator 3, and the thin annular synthetic resin plate 1 is formed.
a is disposed so as to be in close contact with the peripheral surface of the excavator 3. At this time, the tip of the thin annular synthetic resin plate 1a (seal plate) is made to protrude inward from the tip of the thick annular rubber plate 1b (seal plate).

On the other hand, a third ring plate 13 and a fourth ring plate 14
In between, the proximal end (outer peripheral end) of the first annular seal brush 2 and the proximal end (outer peripheral end) of the second annular seal plate 9 are interposed via the first spacer 10, the second spacer 11, and the third spacer 12. The seal brush unit 4 fastened by bolts is formed.

More specifically, the rear annular seal brush 2 is attached to the fifth ring plate 16, and the rear annular seal plate 9 is similarly mounted.
Is attached to the sixth ring plate 17, the first spacer 10 is interposed between the third ring plate 13 and the base end (outer peripheral end ... fifth ring plate 16) of the subsequent annular seal brush 2, and the annular seal is further provided. A second spacer 11 is interposed between the base end of the brush 2 and the base end (outer peripheral end: sixth ring plate 17) of the rear-stage annular seal plate 9, and further, the base end of the rear-stage annular seal plate 9 and the second A third spacer 12 is interposed between the fourth ring plate 14 and
2, 9, 10, 11 and 12 are fastened between the third ring plate 13 and the fourth ring plate 14 with bolts 15 and nuts to form the seal brush unit 4.

A pressing plate 23 made of an elastic metal plate is annularly attached to a front side surface of the rear-stage annular seal brush 2 in the propulsion direction, and a base end of the pressing plate 23 is connected to a base end of the brush 2 (fifth ring). Overlap with the plate 16), and fastening by the bolt 15 is attempted. The holding plate 23 is composed of divided pieces arranged annularly in the same manner as the rear-stage annular sealing plate 9.

The first spacer 10 forms an annular first water-stopping material filling space 21 between the first annular seal plate 1 and the second annular seal brush 2. Similarly, the second spacer 11 fills the space between the second annular seal brush 2 and the second annular seal plate 9 with the annular second water-stopping material filling space 2.
Form 2

The rear annular seal brush 2 is annularly arranged so that its tip protrudes inward, and has an opening smaller in diameter at the center than the outer diameter of the excavator 3.

Similarly, the rear-stage annular seal plate 9 has a number of divided seal pieces 9a arranged in an annular shape such that the tips (inner peripheral ends) thereof face inward, and the central portion thereof has a diameter smaller than the outer diameter of the columnar excavator 3 at the center. An opening is formed. The rear annular seal plate 9 is made of an elastic metal plate.

The rear-stage annular seal brush 2 and the rear-stage annular seal plate 9 are disposed so as to be concentric with the front-stage annular seal plate 1, and each of them is bent in the direction of excavation on the peripheral surface of the columnar excavator 3. While making a close contact in a ring.

That is, the seal brush unit 4 is attached to the outer peripheral surface of the end face of the seal plate unit 5 by bolts 18 so that the seal elements 1, 2, 9 are concentric.

In the example, the third ring plate 13 is placed on the outer surface of the second ring plate 7 and is detachably fastened with bolts 18 and nuts. The bolt 18 is used for the sealing plate unit 5
The second ring plate 7 is integrally protruded rearward from the outer surface of the second ring plate 7, and penetrates between the third ring plate 13 and the fourth ring plate 14 of the seal brush unit 4.
A through-hole 19 is provided on the surface of the bolt, and the bolt 18 is inserted through the through-hole 19 and fastened with a nut.

As shown in FIG. 2, the fastening bolts 15 for fastening the seal brush unit are connected to the third and fourth ring plates 1.
The through holes 19 are arranged at intervals along the annular surfaces of the bolts 3 and 14 and are used for inserting bolts 18 for fastening the units 4 and 5 to each other.
Are arranged at intervals between the fastening bolts 15. Therefore, the seal brush unit 4 can be removed by loosening the nut fastening by the bolt 18.

As shown in FIG. 5, when the excavator 3 protrudes into the center of the assembly of the seal plate unit 5 and the seal brush unit 4, the base end of the preceding annular seal plate 1 and the rear stage By the first spacer 10 interposed between the base ends of the annular seal brush 2, the distal end of the annular seal plate 1 and the distal end of the annular seal brush 2 are displaced back and forth while bending in the propulsion direction. Close contact with the peripheral surface of the excavator 3 is achieved.

The annular first water-stopping material filling space 21 formed between the front-stage annular seal plate 1 and the rear-stage annular seal brush 2 by the interposition of the first spacer 10 further improves the water-stopping action.

According to the above, it is possible to appropriately exert the respective sealing functions of the first-stage annular seal plate and the second-stage annular seal brush, and appropriately solve the problem that it is difficult to remove the unit having the annular seal brush. In addition to the water stopping function of these two, the water stopping function of the water stopping material filled in the water stopping material filling space is added, and the water stopping function of high reliability can be achieved synergistically.

Further, a rear-stage annular sealing plate 9 which is disposed in a ring shape so as to protrude inward at a tip end thereof in the excavation direction of the rear-stage annular seal brush 2 is arranged, and is provided on the peripheral surface of the excavator 3 in the excavation direction. While being bent, it is made to closely contact annularly, and by interposing the second spacer 11 between the base end of the rear-stage annular seal plate 9 and the base end of the rear-stage annular seal brush 2,
The distal end of the rear-stage annular seal plate 9 and the distal end of the rear-stage annular seal brush 2 are shifted back and forth so as to be in close contact with the peripheral surface of the excavator 3 and the second spacer 11 is interposed by the second spacer 11. An annular second water-stopping material filling space 22 formed between the sealing plate 9 and the subsequent annular sealing brush 2
As a result, the water-stopping material filling space is arranged in two stages in the front and rear stages, and the water-stopping function is further improved.

Also, by loosening the fastening by the bolts 18, the seal brush unit 4 is removed, that is, easily removed from the peripheral surface of the rear end portion of the propelled excavator 3, and the seal plate unit on the exit side of the tunnel to be excavated is removed. Can be assembled and reused.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where an excavator is inserted into a conventional assembly of a seal brush unit and a seal plate unit.

FIG. 2 is a front view of the seal brush unit according to the present invention.

FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, showing a state where it is attached to a seal plate unit.

FIG. 4 is a sectional view taken along the line BB in FIG. 2, showing a state where it is attached to a seal plate unit.

FIG. 5 is a cross-sectional view showing a state where an excavator is inserted into an assembly of the seal brush unit and the seal plate unit of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 front-stage annular seal plate 2 rear-stage annular seal brush 3 excavator 4 seal brush unit 5 seal plate unit 6 first ring plate 7 second ring plate 8 box frame 9 rear-stage annular seal plate 9a divided seal piece 10 first spacer 11 second Spacer 12 Third spacer 13 Third ring plate 14 Fourth ring plate 15 Bolt 16 Fifth ring plate 17 Sixth ring plate 18 Bolt 19 Through hole 20 Ground 21 First water-stop material filling space 22 Second water-stop material filling Space 23 Holding plate

Claims (3)

[Claims] 1. An annular seal plate annularly arranged so that a tip portion protrudes inward and an annular seal brush annularly arranged so that a tip portion protrudes inward are concentrically arranged. In addition, the annular seal plate is bent in the excavation direction in the excavation direction at the first stage in the excavation direction so as to closely contact with the annular excavation surface in the excavation direction, and the annular seal brush is bent in the excavation direction in the excavation direction at the latter stage in the excavation direction. In the entrance seal device for a tunnel excavator, which is brought into close contact with a ring while rotating, a spacer is interposed between a base end portion of the first-stage annular seal plate and a base end of the second-stage annular seal brush, and a tip end of the annular seal plate is annularly sealed. The brush is arranged so that the tip of the brush is shifted back and forth so that the close contact is achieved, and the spacer is interposed between the front annular seal plate and the rear annular seal brush. Entrance sealing device for a tunnel boring machine, characterized in that the formation of the water stopping material filling space. 2. An annular seal plate annularly disposed so as to protrude inward at a distal end thereof, and an annular seal brush annularly disposed so as to protrude inwardly from a distal end thereof. In addition, the annular seal plate is bent in the excavation direction in the excavation direction at the first stage in the excavation direction so as to closely contact with the annular excavation surface in the excavation direction, and the annular seal brush is bent in the excavation direction in the excavation direction at the latter stage in the excavation direction. In the entrance seal device for a tunnel excavator to be brought into close contact with a ring while rotating, the first spacer is interposed between the base end of the front-stage annular seal plate and the base end of the rear-stage annular seal brush, and the front end of the annular seal plate is interposed. The annular seal brush is arranged so that the tip of the annular seal brush is shifted forward and backward so that the close contact is achieved.
An annular first water-stopping material filling space is formed between the front-stage annular seal plate and the rear-stage annular seal brush by the interposition of a spacer, and further, the annular portion is formed so that a tip portion projects inward at a rear stage in the digging direction of the annular seal brush. A rear-stage annular seal plate is disposed on the peripheral surface of the excavator to be bent in the direction of excavation so as to closely contact with the periphery of the excavator, and between a base end of the rear-stage annular seal plate and a base end of the rear-stage annular seal brush. The tip of the rear annular seal plate and the tip of the rear annular seal brush are arranged so as to be shifted in front and rear so that the close contact can be achieved with a second spacer interposed therebetween. An entrance seal device for a tunnel excavator, wherein an annular second water-stopping material filling space is formed between the rear annular seal plate and the rear annular seal brush. 3. The entrance seal device for a tunnel excavator according to claim 1, wherein the spacer is made of a rubber material having elasticity.