JPS60148994A - Seal structure of starting opening - 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 (Technical Field) The present invention relates to a seal structure for a starting port formed in a shaft wall for propulsion of a shield tunneling machine.

(Prior art) When a shield excavator is propelled from the starting port of a shaft, in order to prevent excavated soil and groundwater from flowing into the shaft from the starting port, a seal as shown in FIGS. 1 and 2 has been used. A structure is located in a mine wall 12 that defines a launch opening 10 .

In this seal structure, an annular elastic sealing material 16 having a circular hole 16a with a diameter smaller than the outer diameter of the shield body 14 is arranged concentrically with the starting port IO, and the back side of the sealing material 16 is made of a rectangular metal plate. A plurality of metal fittings 18 are arranged around the starting port 10 at intervals. The sealing material 16 and the metal fitting 18 are fixed to the shaft wall 12 by an anchor bolt 20 and a fastener such as a nand 22 that is screwed into the anchor bolt, and the metal fitting 18 has a long hole through which the anchor bolt 20 passes. It is provided.

When the shield tunneling machine starts propulsion, the sealing material 16 is bent in the direction of propulsion of the shield body 14, as shown by the chain line in FIG. come into contact with Thereby, the space between the shield body and the wall defining the starting port is sealed, and the inflow of excavated soil, ground water, etc. from the starting port is prevented.

When the shield tunneling machine is further propelled, the inner circumferential edge of the sealing material 16 comes into contact with, for example, the outer circumferential surface of a lining segment continuing behind the shield body 14. By the way, large earth water pressure from the excavated earth and sand, underground water, etc. acts on the sealing material 16. However, the outer diameter of the lining segment is smaller than the outer diameter of the shield body 14, and the contact area between the seal material 16 and the lining segment is smaller than that between the seal material 16 and the shield body 14. Therefore, each metal fitting 1
8 is moved until its tip comes into contact with the outer peripheral surface of the lining segment. As a result, each gold A18 has a sealing material 1
6 is supported on its back side so that it can maintain the bent state and resist the earth water pressure.

However, each metal fitting is moved by hitting them all at once, which not only requires a large number of people, but also causes a time delay in moving each metal fitting, which may result in an incomplete seal at the starting gate. .

(Objective) Therefore, an object of the present invention is to enable the starting port to be reliably sealed without manual intervention.

(Structure and Effects) The present invention has a circular hole having a diameter smaller than the outer diameter of the shield body, and an elastic sealing material disposed on the mine wall so that the circular hole and the starting port are concentric. , a plurality of metal fittings arranged at intervals around the starting port on the back side of the sealing material, and a fastener for fixing the metal fittings and the sealing material to the mine wall, each metal fitting being A first plate fixed to the mine wall by the fastener and a second plate pivotally attached to the first plate, the leading end of the second plate following the shield body or the rear thereof during propulsion. It is characterized by contacting the outer peripheral surface of the tunnel lining material.

According to the present invention, when the shield tunneling machine is propelled, the second plate rotates angularly in response to the thrust, and its tip portion contacts the outer peripheral surface of the shield body or tunnel lining material that is being propelled. Therefore, the rotation angle of the second plate is maintained, thereby supporting the sealing material.

Further, the present invention is characterized in that the second plate is provided with a stopper that can come into contact with the back surface of the first plate.

According to the present invention, 1. Even if, for example, the shield body is eccentric and the tip of the second plate cannot contact the shield body or the outer peripheral surface of the tunnel lining, the stopper can come into contact with the back surface of the first plate. This will restrict the rotation of the second plate.

Therefore, also in this case, the sealing material can be supported reliably.

(Example) The features of the present invention are as shown in FIGS.
It will become clearer from the following description of the embodiments shown in the figures.

Referring to FIGS. 3 and 4, a seal structure 30 according to the present invention is provided in a vertical shape for promoting shield excavation@32.
The present invention is applied to a circular starting port 38 formed in a shaft wall 36 of No. 4.

The shield excavator 32 includes a shield main body 42 to which a cutter head 40 is rotatably attached in front, and the starting port 38 is formed to have a larger diameter than the outer diameter of the shield main body 42.
It is installed concentrically in the shaft 34. Shield body 42
Behind the shield body 42, a lining segment 44 having a smaller outer diameter is arranged concentrically with the shield body 42. A tail seal 46 is attached to the inner rear end of the shield body 42 in order to seal between the shield body 42 and the lining segment 44.

The shield tunneling machine 32 can be propelled by extending a plurality of jacks 48 fixed to the inner wall of the shield body 42 toward the front end of the lining segment 44, using the jacks 48 as reaction force supports. The shield machine may be propelled by any other method. - by way of example, a plurality of jacks for propelling the lining segment 44 to the rear (
There is a method of arranging (not shown) and operating these to propel the shield tunneling machine.

The shield tunneling machine may be of a so-called manual digging type or a mechanical digging type, and the tunnel lining material is not limited to the above-mentioned lining segments, but may be a tube body, for example. The pit wall 36 defining the starting port 38 is formed of cast-in-place concrete.

Instead of this cast-in-place concrete, it can also be formed from a precast concrete plate, steel material, or the like.

A sealing material 50 having L properties, which is like a rubber plate and constitutes the sealing structure 30, is disposed on the shaft wall 36. The sealing material 50 is attached to the shield body 42 and the lining segment 44.
The center of each circular hole 50a is on the axis of the starting port 30.

A starting port 3 is provided on the back side of the sealing material 50, that is, at the rear thereof.
A plurality of metal fittings 52 are arranged around 8 at intervals. Each metal fitting 52 is fixed to the shaft wall 36 by a fastener 56 together with a sealing material 50 and a pair of washers 54 .

The metal fitting 52 is an anchor bolt 56a constituting the fastener.
A first plate 52a is fixed to the pit wall 36 by a nut 56b screwed thereto, and a second plate 52b is pivotally connected to the first plate via a pin 58.

An anchor pole 56a passing through the sealing material 50 and the first play 52a is attached to the shaft wall 36 by embedding one end in concrete when the shaft wall 36 is formed. When the pit wall is formed of a precast concrete plate, a socket is embedded in the precast concrete plate in advance, and one end of the bolt is screwed into the socket and a nut is screwed into the other end. Further, when the pit wall is made of steel, for example, bolts are welded to the pit wall and nuts are screwed together. In either example, the fastener may have another structure as long as it can fix the sealing material 50 and the metal fittings 52 to the shaft wall.

The metal fitting 52 is positioned and arranged such that the tip of the second plate 52b contacts the outer circumferential surface of the shield main body 42 and the outer circumferential surface of the lining segment 44 while the shield main body 42 is being propelled. As will be described in detail later, as a result, when the shield excavator 32 is propelled and passes through the launch port 38, the second plate can rotate in response to the thrust.

In order to facilitate positioning of the metal fittings 52, the first plate 5
It is desirable that the through hole 60 of the anchor port 56a provided in the anchor port 2a be an elongated hole extending toward the second plate instead of a round hole.

Furthermore, if a stopper 62 is attached to the second plate 52b that protrudes like a claw toward the first plate and can come into contact with the back surface of the first plate 52a, the second plate 52b can rotate in the opposite direction to the rotation direction. Rotation in the direction can be restricted. The stopper 62 can be composed of, for example, a pair of plates, and may be either integral with the second play plate 52b or separate. The non-protruding part of the plate, that is, the part extending along the back surface of the second plate,
Reinforce the second plate. Note that it is optional whether or not the portion reinforcing the second plate protrudes to the side opposite to the stopper 62.

Next, the action of the seal structure 30 according to the present invention will be explained with a focus on the metal fitting 52 located at the top end.
This will be explained with reference to figure a. first.

When the shield digging @ 32 is located behind the metal fitting 52 (
5-a), the second plate 52b is simply suspended in the vertical direction. When the shield excavator 32 starts propulsion and its shield body 42 passes through the starting port 36 (Fig. 5-b), the tip of the second plate 52b contacts the outer peripheral surface of the shield body 42. , receives the thrust, rotates angularly clockwise, and maintains that rotation angle. At this time, the sealing material 50 is bent forward, and the circular hole 50a of the sealing material is pushed out so that the edge thereof comes into close contact with the outer peripheral surface of the shield body 42. Thereby, the second plate 52b supports the sealing material 50 while being in contact with the back surface thereof, and the starting port 38 is sealed. .

Shield digging @32 is further promoted and the second play),
When the tip of the second plate 52b comes into contact with the lining segment 44, the outer diameter of the lining segment 44 is smaller than the outer diameter of the shield body 42, so the second plate 52b rotates slightly counterclockwise from the rotational angular position. The angular position is maintained (FIG. 5-a), and the sealing material 50 is reliably held by the second play 152b, and the starting port 36 is sealed, just as when the shield body 42 passes through the starting port 36.

In addition, as shown in FIG. 6, when the direction of propulsion of the shield excavation @ 32 changes due to sudden changes in the geology and the crack becomes eccentric, the second plate 52b is attached to the outer peripheral surface of the shield body 42 or the lining segment 44. Contact may become impossible.

However, since the stopper 62 comes into contact with the back surface of the first plate 52a and prevents the second plate 52b from further rotating counterclockwise from the vertical position,
In this case as well, the sealing material 50 is supported by the second plate 52b. Therefore, there is no possibility that the sealing material 50 on which the water pressure is applied is bent in the opposite direction and excavated soil, groundwater, etc. leak out.

As described above, the second plate 52b is connected to the stopper 6.
However, if the stopper is not provided, the first and second plates should be tightly pivoted in advance so that the second plate 52b does not rotate under no load when the metal fittings are installed. It is desirable to keep it.

According to the seal structure according to the present invention, the second plate of the metal fitting constituting the second plate is pivotally flexible, and its tip abuts against the outer peripheral surface of the shield body or tunnel lining material that is being propelled. The second plate follows the propulsion of the shield tunneling machine and automatically and reliably holds the sealing material from behind.

Furthermore, even if the shield tunneling machine is eccentric and the second plate cannot come into contact with it, the rotation of the second plate is restricted by the stopper provided on the second plate, and the sealing material is prevented from being in a non-retained state. be able to.

[Brief explanation of drawings]

1 and 2 are a side view and a vertical sectional view, respectively, of a conventional seal structure, and FIGS. 3 and 4 are a side view and a longitudinal sectional view, respectively, of a seal structure according to the present invention.
5-b, 5-a, and 6 are explanatory views of the seal structure at the top, respectively. 30: Seal structure, 32: Shield excavator, 34: Vertical shaft, 36: Pit wall. 38 Launch port, 42: Shield body, 44: Lining segment, 50: Seal material, 52: Gold
Tools, 52a, 52b: first and second plates. 56: Fastener, 62: Stopper. Agent Patent Attorney Nobuyuki Matsunaga Figure 1, - 21'' Figure 3, Figure 41'' S6 Figure 50 2 Figure 50, Figure 5bl, Flash No. 6L1

Claims (5)

[Claims] (1) A seal structure for a starting port formed in the wall of a shaft for propulsion of a shield tunneling machine, which has a circular hole with a smaller diameter than the outer diameter of the shield body, and the circular hole and the starting port are connected to each other. an elastic sealant disposed on the mine wall so that they are concentric; a plurality of metal fittings 6 disposed at intervals around the starting port on the back side of the sealing material; the metal fittings and a fastener for fixing the sealing material to the pit wall, each metal fitting including a first plate fixed to the pit wall by the fastener and a second plate pivotally connected to the first plate; A seal structure for a starting port, wherein during propulsion, a tip end of the second plate comes into contact with an outer surface of the shield main body or an outer circumferential surface of a tunnel lining material continuing behind the shield main body. (2) The pit wall is formed of cast-in-place concrete, and the fastener includes an anchor bolt embedded in the pit wall and extending through a hole drilled in the first plate, and a nut screwed thereto. , Claim No. 1
Seal structure described in ). (3) The pit wall is formed of a precast concrete L plate, and the fastener includes a socket embedded in the pit wall and a bolt that is screwed into the socket and extends through a hole drilled in the first plate. A seal structure according to claim (1), comprising: (4) The seal structure according to claim (2) or (3), wherein the hole is a long hole extending toward the second plate. (5) A seal for a starting port formed in the wall of a shaft for propulsion of a shield tunneling machine, which has a circular hole with a smaller diameter than the outer diameter of the shield body, and the circular hole and the starting port an elastic sealing material disposed on the mine wall so that the two parts are concentric with each other; a plurality of metal fittings disposed on the back side of the sealing material at intervals around the starting port; a fastener for fixing the sealing material to the pit wall; the metal fittings include a first plate fixed to the pit wall by the fastener; and a second plate pivotally attached to the first plate. and a second plate having a stopper that can come into contact with the back surface of the first plate, and during propulsion, the tip of the second plate is attached to the outer circumferential surface of the shield main body or behind it (tunnel lining material). A seal structure for the starting port, which is characterized by contacting the outer peripheral surface of the starting port.