JPH0786304B2 - Underground joining method in shield method and shield machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underground joining method in a shield construction method and a shield machine used in this method.

<< Conventional Technology >> The shield construction method is a construction method used when constructing a tunnel in the earth and sand ground, and a shield machine is used to excavate the ground.

When constructing a tunnel by the shield construction method, for example, when the total length of the tunnel is relatively long, start from the end side of the tunnel where a pair of shield excavators are to be constructed, and then in the ground at a predetermined position. A joining method is disclosed in, for example, Japanese Patent Laid-Open No. 63-44098.

In the joining method shown in this publication, a hood slidable in the front-rear direction is provided in front of the outer shell of at least one of the shield excavators to be joined underground, and the shield is provided at the joining point. When the excavator arrives, it advances the hood and connects it to the other shield excavator.

According to the joining method having such a configuration, it is said that the sealing property at the joining point is improved, and the work period is shortened and the reliability is improved. However, this joining method has technical problems described below. there were.

<< Problems to be Solved by the Invention >> That is, in the joining method shown in the above publication, since the hood is formed in a tubular shape, if the shield machines exactly match at the joining point, a very big problem will occur. Although it does not happen, in reality, even if the direction is being checked while controlling the shield machine with a jaroscope, etc., it is difficult to make an exact match, and the shield machine is joined in a slanted state. There is.

However, when the shield machine is joined in such a state, when the hood is formed in a tubular shape, its tip is in a one-sided contact with the other shield machine,
There is a problem that the sealing property cannot be obtained at the joining point.

The present invention has been made in view of such conventional problems, and an object thereof is to make a hood intervene between shield excavators even if a gap occurs between the shield excavators to be joined. An object of the present invention is to provide an underground joining method in a shield construction method and a shield machine which can be performed.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention, as an underground joining method, a method of joining a pair of shield excavators started from the end portion at a predetermined position, At least one of the shield machines is provided with a body hood divided from the body of the shield machine at intervals in the circumferential direction, and protrudes to the gap portion on the face plate of the shield machine. A face plate hood is provided, and when each shield excavator reaches the predetermined position, the main body part and face plate hood are respectively projected, and these hoods are hung between the other shield excavator. It is characterized by

Further, as a shield machine for carrying out the above joining method, in a shield machine for a shield construction method that joins a pair launched from the end in the ground at a predetermined position, installed so that it can project from the shield machine body And has a main body hood divided at intervals in the circumferential direction, and a face plate hood that is installed so as to be able to project on the face plate of the shield machine, and that protrudes in the gap part of the main body hood. Characterize.

<Operation> According to the joining method and the shield machine of the above configuration, the hoods provided on the main body and the face plate are divided at intervals in the circumferential direction, so that the machines are inclined with respect to each other. Even if they are joined together, the amount of protrusion of the hood can be individually selected in the divided parts, so that the hood can be securely bridged between the excavators.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5 show one embodiment of the underground joining method and the shield machine in the shield construction method according to the present invention.

The shield machine shown in the figure shows a case where the present invention is applied to a muddy type shield machine, and the shield machine 10
Has a cylindrical skin plate 12 and a face plate 14 rotatably installed at the tip of the skin plate 12.

A rotary shaft 16 is fixedly provided on the back side of the face plate 14, and a cylindrical ring gear 18 is attached to the rotary shaft 16 and
A gear fixed to the rotation shaft of the drive motor 20 meshes with the gear 18.

An annular partition wall is provided on the outer periphery of the ring gear 18 with a sealing material interposed.
22 is fixed to the skin plate 12 and defines a chamber 24 on the back side of the face plate 12, and this chamber 24 is provided with a mud pipe 26 and a mud pipe 28 that penetrate the partition wall 22. ing.

Then, inside the skin plate 12, a reaction force is sequentially applied to the segments 30 installed behind the excavator 10,
Shield jack 32 for advancing 10 and face plate adjustment jack 34 and segment 30 for adjusting the angle of face plate 14
And the assembling device 36 is installed.

Further, on the inner peripheral side of the skin plate 12, a plurality of main body hoods that are spaced from each other in the circumferential direction and project from the inner side thereof.
37 are provided.

As shown in FIG. 2, the main body hood 37 has an arc shape in which the face plate 14 is divided into 16 substantially evenly, and is controlled by hydraulic pressure to project forward from a slit hole of the face plate 14 described later. To be done.

On the other hand, the face plate 14 is provided with a tip cone 38 that is slidably moved in the axial direction at the center, and on the outer periphery of the tip cone 38,
Four main cutter spokes 40 are radially provided at 90-degree intervals.

Slit holes 42 communicating with the chamber 24 are formed on both side surfaces of each main cutter spoke 40, and each slit hole 40 has a plurality of cutter bits 44 fixed to the side surface of the main cutter spoke 40. Is protruding.

In addition, between the main cutter spokes 40 that are adjacent in the circumferential direction,
Each of the sub cutter spokes 46 is provided, and the sub cutter spokes 46 have a radius of the half of the face plate 14 and a slit hole 40 is formed around the sub cutter spoke 46.
A plurality of cutter bits 44 are also provided.

Further, in this embodiment, side over cutters 48 are provided on the outer peripheral edge sides of the main and sub cutter spokes 40, 46, respectively.

As shown in FIG. 3 in detail, the side-over cutter 48 is slidably moved in the radial direction of the face plate 14 by a plunger 50 of a jack built into the spokes 40 and 46, and is normally used. Is located at a position close to the inner circumference of the skin plate 12 due to the extension of the plunger 50, excavates the ground, and at the time of underground joining, the plunger 50
Due to the contraction of the plate, it is retracted to a position that does not affect the projection of the face plate hood described later.

On the other hand, on the outer peripheral edge of the face plate 14, the main body hood 37
A face plate hood 52 that is projected forward is provided by a mechanism similar to.

This face plate hood 52 is on the same circumference as the main body hood 37, and is positioned between the slit holes 42 of the face plate 14 so as to be located between the face plate hoods 37 that are adjacent in the circumferential direction. It is provided.

The member 54 shown in FIG. 1 is a freezing tube through which the heat medium for freezing flows, and the member 56 is a skin plate.
This is a temperature measuring tube for measuring the temperature of the frozen layer formed on the outer circumference of 12.

Next, an underground joining method using the shield machine 10 having the above configuration will be described.

In the following description, the shield machine 10 constructed as described above is excavated from one end of the tunnel to be constructed, and the shield machine 10 'excavated from the other end is a conventionally used mud type. However, it is of course possible to use both shield excavators according to the present invention.

In the underground joint of shield machine 10, 10 ', first,
When the shield machines 10 and 10 'reach near the joining position, both excavations are stopped, then one shield machine 10' is dug up to the joining position, and the end cone of the rear panel 14 'is stopped. 38 'is drawn in, and the mud in the chamber 24' is replaced with the mud solidifying material.

Then, the boring hole 58 is excavated from within the shield machine 10 ', the position of the other shield machine 10 is confirmed, and after this confirmation, the shield machine 10 is excavated toward the joining position.

At the same time, the inside of the shield machine 10 'is disassembled and removed, leaving the partition wall 22' and the shield jack 32 '.

When the shield machine 10 reaches the vicinity of the joining position, the tip cone 38 is drawn in, and then further excavated to advance to the joining position and stopped.

Then, the face plate 14 is adjusted by the face plate adjustment jack 34 so as to be parallel to the face plate 14 'of the shield machine 10', and
The slit hole 42 of the face plate 14 is rotated and adjusted so as to be positioned in front of each body hood 37.

Then, with the side over cutter 48 reduced,
The main body hood 37 and the face plate hood 52 are projected from the shield machine 10 side, and each of the hoods 37, 52 has its tip end abutted against the face machine 14 'on the shield machine 10' side to shield the shield. It is passed between the excavators 10 and 10 '.

After this, the muddy water in the chamber 24 is replaced with the muddy water solidifying material.

Next, the partition 22 in the shield machine 10 and the shield jack 32, the hoods 37, 52 are left to remove other parts, and the freezer is carried into the shield machine 10, 10 ', and the freeze pipe is frozen. Circulate the freezing liquid to 54 and shield shield machine
A frozen layer 60 is formed on the outer periphery of 10, 10 '.

In this case, depending on the geology, an overcutter 48 may be provided with an overcut portion on the outer periphery of the skin plate 12, and the overcut portion may be replaced with a muddy water solidifying material to serve as a water stop portion that replaces the frozen layer 60. It is possible.

When the frozen layer 60 is formed, the temperature measuring tube 56 monitors the temperature of the frozen layer 60 to dismantle the earth and sand inside the chambers 24 and 24 'and the partition walls 22 and 22', and then to freeze the frozen layer 60. The layer 60 is forcibly dismantled and the secondary wound concrete layer 62 is formed to complete the joining.

Now, according to the joining method and the shield machine 10 having the above-described configurations, the hoods provided on the main body and the face plate, respectively.
Since 37 and 52 are divided at intervals in the circumferential direction, even if the excavators 10 and 10 'are joined in an inclined state, the protruding amount of each hood 37 and 52 is individually divided at the divided portions. The hoods 37 and 52 can be securely hung between the excavators 10 and 10 '.

In the above embodiment, the case where the side over cutter 48 that is moved in the radial direction is provided on the tip side of each cutter spoke 40, 46 is illustrated, but the implementation of the present invention is not limited to this, and the side Instead of the overcutter 48, a copy cutter conventionally used in a shield machine may be used.

The type of the shield machine 10, 10 'is not limited to the muddy type, but may be an earth pressure type, for example.

<Effects of the Invention> As described above in detail in the embodiments, according to the underground joining method and the shield machine in the shield construction method according to the present invention, the hood that is bridged between the shield machines at the joining position is surrounded. Since it is divided in the direction, even if the shield machines are tilted diagonally, the hood can be securely spanned, and the reliability and safety of the construction are improved.

In addition, since the hood can be securely stretched between the shield machines, the exposed portion of the ground is extremely reduced, the thickness of the frozen layer is reduced, and the construction period can be shortened.

Further, according to the present invention, it is sufficient to provide the hood only on one shield machine side, and as the other shield machine, an ordinary one can be used, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a shield machine according to the present invention, FIG. 2 shows the front of the machine, FIG. 1 (A) is a front view at the time of excavation, and FIG. Of Fig. 3, Fig. 3 is a detailed view of the body hood of the excavator, Fig. 4 is an explanatory view of the excavator side over cutter, and Fig. 5 is a process of the underground joining method using the excavator. It is explanatory drawing shown in order. 10,10 ′ …… Shield machine 14,14 ′ …… Surface board 37 …… Main body hood 52 …… Surface board hood

Claims (2)

[Claims] 1. A method of connecting a pair of shield excavators, which are started from the ends, to the ground at a predetermined position, wherein at least one of the shield excavators is circumferentially projected from its main body. With the main body hood divided at intervals, provided with a face plate portion hood projecting into the gap portion on the face plate of the shield machine, when each shield machine reaches the predetermined position, An underground joining method in a shield construction method, characterized in that the main body portion and the face plate portion hood are respectively projected, and these hoods are bridged between the other shield excavator. 2. A shield machine for a shield construction method, which joins a pair starting from an end to the ground at a predetermined position, is installed so as to project from the shield machine body, and is divided at intervals in the circumferential direction. And a face plate hood that is installed so as to project on a face plate of the shield machine and that protrudes in a space portion of the body machine hood.