JPS61221492A - Seal apparatus in depature vertical pit of shield type excavation machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealing device for a penetration part for starting a shield type excavator provided on the wall of the starting shaft of the shield type excavator in the shield construction method.

(Conventional technology) As shield construction work for muddy water systems, earth pressure systems, and mud systems becomes larger in size, and due to recent social conditions, construction conditions for ground subsidence have become stricter. The complete implementation of backfill injection has become more strictly required.

Conventionally, backfilling was performed after a certain section of segments had been assembled, but before the backfilling material was injected, between the segments and the ground! ! 11 remains, which has been a cause of ground subsidence.

For this reason, it is expected that shield type excavators equipped with a backfilling material injection device will be used in many cases so that the backfilling material can be injected subsequent to segment assembly.

(Problems to be Solved by the Invention) However, when using such a shield type excavator, when starting from the vertical shape that is the starting base of the excavator,! Problems such as leakage of muddy water into the mine and insecurity of the face due to outflow of earth and sand have become a problem, and few effective countermeasures have been taken in the past. There were no shield type excavators.

(Means for Solving the Problems) The present invention has been proposed in order to solve the above five problems, and is a shield in which a backing material injection pipe is disposed on the outer peripheral surface of the shield skin plate. This relates to a sealing device in which a corresponding portion of the backfilling material injection pipe is formed in a convex shape that bulges outward around a through hole for starting a shield type excavator provided on the wall of a starting shaft of a type excavator. be.

(Function) As described above, in the present invention, a backing material is injected into the outer circumferential surface of the skin plate, and a J-ib is formed on the vertical wall surface for starting the shield type excavator. A convex annular entrance gasket is provided around the through hole, with a portion corresponding to the backfilling material injection pipe bulging outward, so that the excavator can install it on the wall of the starting shaft. When starting from the starting through-hole, the inner circumferential surface of the entrance seal is in close contact with the outer circumferential surface of the excavator body, and the inner circumferential surface of the convex portion of the seal is in close contact with the backfilling material injection nob. However, the space between the through hole and the shield type excavator that starts from the turn is reliably sealed.

(Effects of the Invention) As described above, according to the present invention, there is provided a shield type tunnel excavator equipped with an arm for injecting backing material on the outer peripheral surface of the skin plate,
Since a seal is secured between the starting through hole provided on the wall of the starting shaft of the excavator, there is no leakage of mud or outflow of excavated soil into the starting shaft when the excavator starts.
The water pressure and soil pressure at the face are maintained, and the stability of the face is achieved.

Furthermore, according to the present invention, since a shield type excavator equipped with a backfilling material injection device on the outer circumferential surface of the skin plate can be used without any problems, the backfilling material can be injected subsequent to segment assembly. The amount of ground deformation will be reduced, and the impact on the roadsides where shield construction will be carried out will be reduced.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(4) is a shield type excavator, in which a backfilling material injection pipe <b> is disposed on the outer circumferential surface of a skin plate (α), and is covered with a protective cup 1-(C). In the figure, (d) is caulking.

(B) is the starting shaft for the excavator (4), and around the through hole (C) for starting the excavator provided on the wall thereof, there is a trap bulge on the outer side corresponding to the backfilling material injection pipe (b). An annular entrance gasket (1) having a projecting convex portion (1a) is attached, and an elastic body (2) made of urethane rubber or the like is layered and adhered along the inner peripheral surface of the annular entrance gasket (1).

The entrance nozzle skin (1) has a convex part with the same shape as the entrance nozzle skin (1), which also serves as annular reinforcement.
3) through the bolt (4) through the through hole (C).
is fixed around the .

At this time, a cloth seal (5) for protecting the elastic body (2) and an elastic thin iron plate (6) are attached to the entrance seal presser plate (3), and the rear end of the entrance seal (υ An auxiliary sealing sheet (7) made of neoprene flakes is attached to the excavator in order to improve the fit when starting the excavator.

Since the illustrated embodiment is constructed as described above, as shown in FIG. After covering the protective material U) to prevent damage to the sealing device around the through hole (C) when the excavator starts, the elastic body (2) and the cover seal (5
) etc., and to prevent these from being damaged, the excavator (4) is gradually started and penetrated into the through hole (C) provided in the wall of the starting shaft (B). (See Figure 1) At this time, the elastic body (2) layered on the inner circumferential surface of the annular entrance packing (1) is crimped onto the outer circumferential surface of the main body of the excavator (4), and the backing material Injection tube (b) coating material (
C) is the convex shape m aα of the entrance gasket (1)
) An elastic body (21K) layered on the inner circumferential surface is crimped to seal between the through hole (C) and the shield type excavator housing.

As a result, there is no leakage of mud or outflow of excavated soil from the through hole (C) into the vertical shape (B), the face water pressure and soil strength are maintained, and the stability of the face is maintained.

Further, according to the above embodiment, since the shield type excavator with the backfill material injection pipe (6) attached to the outer peripheral surface of the skin plate (α) can be used without any problem, the backfill material can be injected immediately after the segment assembly. can be injected, thereby reducing the amount of ground deformation and reducing the impact on the roadside where shield construction is being performed.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, and can be modified in various ways without departing from the spirit of the invention. be.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a sealing device in a starting shaft of a shield type excavator according to the present invention, and FIG.
Figures 1 and 3 are vertical side views showing the state of the shield type excavator before starting, and Figure 4 is a vertical cross sectional front view of the backfilling material injection groove attachment part in the shield type excavator. Prisoner... Shield type tunnel excavator, (B)... Start shaft, (e)... Penetration hole, (1)... Entrance seal, α [... Convex part, (2)...・Elastic body agent Patent attorney Shige Okamoto 2 people outside the text 4 figures

Claims (2)

[Claims] (1) The shield skin plate has a backfill material injection pipe arranged on the outer circumferential surface of the shield skin plate.The backfill material injection pipe is placed around the through hole for starting the shield type excavator provided on the wall of the starting shaft of the shield type excavator. A sealing device for a starting shaft of a shield type excavator, characterized in that a corresponding part thereof is provided with an annular entrance gasket formed in a convex shape that bulges outward. (2) The annular entrance gasket is attached to the periphery of the shield type excavator starting through hole via an annular holding fitting having a similar shape to that of the entrance gasket provided on the outer surface of the annular entrance gasket. A sealing device for a starting shaft of a shield type excavator according to claim 1, characterized in that an elastic material such as urethane rubber is layered along the inner circumferential surface of the seal.