JPH0610596A - Cast-in-place lining method of shield tunnel and lining device thereof - Google Patents

Abstract

PURPOSE:To reduce a construction period by promoting execution efficiency and safety and to make it possible to have a wider working space. CONSTITUTION:After the deformation of an internal form 5 is prevented by deformation preventing rings 7, a shield machine 2 is driven by applying reaction force to beam members 16 buried in the existing linings 9 and, at the same time, after lining members are pressed by a plurality of press jacks 11 for specific hours through press rings 10, the press rings 10 are moved to a facing side by the press jacks 11 to assemble lining reinforced member 18. After that, a lining member injection space 21 for the following process is formed by sliding the whole internal form 5 to the facing side for a specific distance in conjunction with the deformation preventing rings 7, pushing jacks 3 and tension jacks 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shield tunnel in place and a device therefor.

[0002]

2. Description of the Related Art Conventionally, lining of shield tunnels has been performed by assembling steel or reinforced concrete segments in a shaft formed by a shield machine. However, in such a segment lining method, the segment is expensive, it takes a long time to assemble the segment, and there are drawbacks such as a tail void that requires backfilling injection work. ,
A lining method in which a lining material such as concrete is cast on site in a tunnel mine using an inner formwork has been proposed.

According to this method of casting in-situ, a lining material is injected into a lining material injection space surrounded by a tail portion, an inner frame, a press ring and an existing lining of a shield machine, and a jack is inserted through the press ring. In order to secure the quality of the lining by pressing the lining material with.

When propelling the shield machine, there is a method of applying a pressure to the lining material or applying a reaction force to the reaction force receiving member embedded in the lining material, the inner formwork or the like.

[0005]

However, the above-mentioned conventional on-site overcast construction method has the following problems. The inner mold is dismantled from the section where the predetermined strength was developed,
In order to form a new lining material injection space, it is transported to the face of the face and reassembled, but these are underground works, which poses a problem in terms of workability and safety. The method of obtaining a propulsive reaction force by pressurizing the lining material has an adverse effect on the lining material that is not yet solidified, and cannot sufficiently control the pressing force / pressurizing time. With the method of obtaining the propulsive reaction force by the reaction force receiving member or the inner form, the early strength of the lining material cannot be obtained, and the construction cycle becomes long. There is also a method of separately controlling the pressure jack and the propulsion jack for the lining material as jacks of different systems, but the management method is difficult and the jack installation space is required, so the work space becomes narrow.

The present invention has been made in view of the above problems, and its purpose is to improve the workability and safety, thereby shortening the construction period and making a large working space. A lining method and a lining device therefor.

[0007]

The gist of the construction method for cast-in-place lining of a shield tunnel of the first invention for solving the above-mentioned problems is that the tail part of the shield machine, the inner formwork, the press ring and the existing lining are constructed. Preventing the inner formwork from being deformed by the deformation prevention ring in the in-situ lining method of the shield tunnel, in which the lining material is injected into the lining material injection space surrounded by After that, while the reaction force is applied to the girder member embedded in the existing lining to drive the shield machine with a plurality of shield jacks, the lining material is pressed with a plurality of press jacks through the press ring. After pressurizing for a predetermined time, the press ring is moved to the face of the face by the press jack to assemble a lining reinforcement including the girder member, and then the deformation preventing ring and the pressing jack. It is characterized in that a lining material injection space for the next step is formed by sliding the entire inner formwork to the face side by a predetermined distance in cooperation with a tension jack. The gist of the in-situ lining device for a shield tunnel of the invention is a in-situ lining device for a shield tunnel including a shield machine main body, an inner formwork and a press ring, which is in contact with the press ring,
A plurality of press jacks for applying pressure to the lining material and moving the press ring, and a plurality of shield jacks for abutting the girder member embedded in the existing lining and propelling the shield machine, Deformation-preventing rings arranged alternately on concentric circles outside the installation position to prevent deformation of the inner formwork, and a plurality of sets of pressing jacks and tension jacks for sliding the inner formwork to the face of the face. Are arranged at appropriate positions.

[0008]

In the first aspect of the invention, the shield machine is propelled by the reaction force exerted on the girder member embedded in the lining material, and the reinforced lining material is pressurized, and then the lining material for the next step is applied. Since the material injection space is formed by sliding the inner mold,
It is possible to quickly form the lining material injection space for the next process,
The construction period can be significantly shortened compared to the conventional method. Further, in the second invention, a sufficiently large propulsive reaction force can be obtained by the press jack for pressing the lining material and the shield jack abutting on the girder member continuously buried in the existing lining. By the joint action of the deformation prevention ring, the pressing jack and the tension jack, the inner formwork can be safely and reliably slid to the predetermined position on the face of the face.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The lining method of the first invention uses the lining apparatus of the second invention. This lining device 1 is
Inside the tail part of the shield machine 2 that advances the inside, the front inner mold 5a, the middle inner mold 5b, and the rear inner mold 5c that are connected in the length direction of the tunnel by the pressing jack 3 and the pulling jack 4. The formwork 5 is assembled in an annular shape.

The front inner mold 5a and the middle inner mold 5
b, the rear inner formwork 5c is stiffened by stiffening ribs 6, and in order to prevent further deformation thereof, a plurality of deformation preventing means are arranged at appropriate places on the inner peripheral surface. The deformation preventing means is composed of a deformation preventing ring 7 and a hydraulic jack 8 which are divided into two parts. The deformation preventing ring 7 is brought into close contact with the inner formwork 5 by the extension of the hydraulic jack 8 so as to prevent the deformation of the lining material during pressurization. The deformation of the mold 5 can be prevented, and as will be described later, a jack reaction force can be obtained when the inner mold is slid, and the deformation prevention ring 7 is loosened by contraction of the hydraulic jack 8 so that the inner mold 5 can face the face. Has the effect of smoothly sliding to.

An annular press ring 10 for pressing the lining material is slidably fitted to the front end of the inner formwork 5 on the face side, and a plurality of press jacks 11 are provided on the face side. The shield jacks 12 are alternately arranged on the concentric circles. The press jack 11 and the shield jack 12 are fixed to a plate 13 fixed to a main body steel shell of the shield machine 2 to be fixed to the shield machine 2
And to pressurize the lining material.

Further, the press ring 10 has a sealing material 14
Is hermetically inserted between the shield machine 2 and the inner frame 5, so that the shield jack 12 and the press jack 11 can be retracted by the contracting action of the shield jack 12 and the press jack 11 via the fitting jig 15. (See Figure 5). Further, through holes 10 of the girder member 16 which is a main constituent element of the lining reinforcing material 17 buried in the lining at appropriate places of the press ring 10.
a is provided, and the girder member 16 and the press ring 10 are airtightly fitted by the sealing material 14a (see FIG. 6).

The components of this lining reinforcement 17 are:
For example, as shown in FIG. 7, a combination of a girder member 16 made of a vertical plate type steel, an arc-shaped reinforcing member 18, and a force distribution bar 19 is used. An end plate 20 having bolt holes 18a at the ends of the girder member 16 and the reinforcing member 18.
Is provided, and the lining reinforcement 17 is assembled in the lining material injection space 21 by joining the end plates 20 to each other.

The distribution muscles 19 are arranged so as to penetrate the reinforcing member 18 at appropriate intervals from the girder member 16. The girder member 16
Further, the reinforcing member 18 is provided with air vent holes 18b at several positions, and the press ring 10 is provided with an insertion hole 10b for the force distribution muscle 19.

FIG. 9 shows another structural example of the lining reinforcing material 17, which is composed of a girder member 16 made of H-shaped steel, an arc-shaped main rebar 22, and a force distribution bar 19. . Incidentally, H
As an alternative to the shaped steel, a cylindrical girder member 16 filled with concrete as shown in FIG. 10 may be used. In this case, the connecting jig 23 is used to connect the cylindrical girder members 16.

Further, these girder members 16 and lining reinforcement 1
By disposing a dowel or the like at 7, integration with the lining material is achieved, and the effect as a synthetic structure can be expected.

Next, a method of in-situ lining and covering a shield tunnel using the lining apparatus 1 will be described. FIG. 1 shows the preparatory work in the lining material injection space 21, that is, the girder member 1.
Assembling the lining reinforcement 17 including 6, sliding the inner formwork 5 to the face, setting the press ring to a predetermined position, and attaching the deformation preventing ring 7 to the inner formwork 5 Shows.

From this state, a predetermined amount of lining material such as concrete is injected by the lining material injection pipe 24 installed from the inner surface of the inner mold 5, and the press jack 11 through the press ring 10 to the lining material. Pressurization is performed for a predetermined time, and a reaction force is applied to the girder member 16 to propel the shield machine 2 with the shield jack 12.

When the pressing of the lining material is completed, the press ring 11 is contracted by the contraction of the press jack 11 to form the lining material injection space 21 for the next step. The lining reinforcement 17 including the girder member 16 is assembled by pulling back to the face side. This work is to carry in and assemble the girder member 16, the reinforcing member 18 or the main reinforcing bar 22, and the distributing bar 19 which are divided by using the erector 25 or the like. By this, the lining reinforcement 17 embedded in the existing lining 9 is connected.

Next, the inner formwork 5 is slid toward the face. In this method, first, the front deformation prevention ring 7a of the deformation prevention ring 7 is loosened, and then the middle deformation prevention ring 7a.
While adhering b to the mold 5b in the middle part to take reaction force,
The front inner formwork 5a is slid by the extension of the front pressing jack 3.

Next, the intermediate deformation preventing ring 7b is loosened, and the front and rear deformation preventing rings 5a and 5b are brought into close contact with the front inner mold 5a and the rear inner mold 5c to generate reaction force, The middle inner mold 5b is slid by contraction of the tension jack 4 and extension of the rear pressing jack 3.

Then, loosen the rear deformation preventing ring 7c,
While the intermediate portion deformation preventing ring 7b is brought into close contact with the intermediate portion inner formwork 5b to generate a reaction force, the rear inner formwork 7c is slid by contraction of the rear pulling jack 4.
Incidentally, the pressing jack and the pulling jack which are not actuated are in a free state, and the inner formwork 5 is slid.

Next, after sliding the entire inner mold 5 to a predetermined position, the press ring 10 is set to a predetermined position by the control of the press jack 11 to form a lining material injection space 21 for the next step. , All deformation prevention rings 7a, 7
b and 7c are closely attached to the inner formwork 5.

Then, the above-described work is repeated in sequence to construct a field tunnel lining work for the shield tunnel. The inner formwork 5 according to the present invention is used by assembling a steel unit having the stiffening ribs 6 into an annular shape. However, as shown in FIG. It is possible to sufficiently deal with the case of a curved line and attitude control such as meandering correction.

[0025]

[Effects of the Invention] Since the entire inner formwork is slid toward the face to form a new lining material injection space, the work of disassembling, transporting and reassembling the inner formwork is not necessary, which is significantly superior to the conventional method. Therefore, the construction period can be shortened.

It is possible to easily control the pressurizing force and the pressurizing time during pressurization of the lining material.

Since the deformation preventing ring is provided, the deformation of the inner mold form can be prevented and the adverse effect on the lining material can be prevented, and the pressure control on the lining material can be facilitated.

The lining reinforcement including the girder member can sufficiently obtain the propulsive reaction force of the shield machine, and a strong tunnel structure can be obtained by the combined effect of the lining material including the girder member and the lining material. You can

The shield jack and the press jack are
Since they are arranged alternately on the concentric circles outside the inner formwork position,
It is possible to secure a wide working space for the work of injecting the lining material and the work of discharging the excavated soil.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state in which a tunnel is excavated by a shield machine.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a sectional view taken along line bb of FIG.

FIG. 4 is a sectional view taken along line cc of FIG.

FIG. 5 is a partial cross-sectional view of a press ring.

FIG. 6 is a sectional view of a through hole of a press ring.

FIG. 7 is a perspective view of a lining reinforcement.

FIG. 8 is a front view of a state in which a lining reinforcement is assembled.

FIG. 9 is a perspective view of a lining reinforcement material showing another embodiment.

FIG. 10 is a perspective view of a girder member.

FIG. 11 is a plan view showing another example of the arrangement configuration of the inner formwork.

[Explanation of symbols]

 1 Lining device 2 Shield machine 3 Pressing jack 4 Tension jack 5 Inner formwork 6 Stiffening rib 7 Deformation prevention ring 8 Hydraulic jack 9 Existing lining 10 Press ring 11 Press jack 12 Shield jack

Claims (2)

[Claims] 1. A lining material is injected into a lining material injection space surrounded by a tail portion, an inner formwork, a press ring and an existing lining of a shield machine, and the lining material is pressure-cured. In the cast-in-place construction method of a shield tunnel, the deformation of the inner formwork is prevented by a deformation prevention ring, and then a reaction force is exerted on the girder member embedded in the existing lining to shield the shield by a plurality of shield jacks. After propelling the machine and pressing the lining material with a plurality of press jacks through the press ring for a predetermined time, the press ring is moved to the face by the press jack, and the lining including the girder member is pressed. After assembling the reinforcing material, after that, the deformation prevention ring and the pressing jack and the tension jack cooperate with each other to slide the entire inner formwork to the face side by a predetermined distance. In-situ lining method for shield tunnels, characterized by forming lining material injection space for each process. 2. A shield tunnel in-situ lining apparatus including a shield machine main body, an inner formwork and a press ring, which presses against the press ring and moves the press ring. Multiple press jacks,
A plurality of shield jacks that abut the girder member embedded in the existing lining and that propel the shield machine are alternately arranged on a concentric circle outside the installation position of the inner formwork,
A deformation prevention ring for preventing the deformation of the inner mold, and a plurality of sets of pressing jacks and pulling jacks for sliding the inner mold to the face of the face are respectively arranged at appropriate positions. On-site lining equipment for shield tunnels.