JPH0541798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an on-site lining method for shield tunnels and an apparatus therefor.

In particular, the purpose is to ensure the quality of the lining by pressurizing the lining material that does not harden for a certain period of time, and to shorten the construction period by sliding the inner formwork toward the face side.

(Prior Art) Conventionally, shield tunnel lining materials have been constructed by assembling steel or reinforced concrete segments in a shaft formed by a shield machine.

However, these segment lining methods have some drawbacks, such as the segments are expensive, the assembly process takes time, and tail voids occur, requiring backfilling. A lining method has been proposed in which lining materials such as concrete are cast on-site inside the tunnel using internal formwork.

This on-site lining method involves injecting the lining material into the lining space surrounded by the tail of the shield machine, the inner formwork, the press ring, and the existing lining, and then covering it with jacks through the press ring. The aim is to ensure the quality of the lining by pressurizing the work materials.

When the shield machine is propelled, there is a method of taking the reaction force using the pressure force of the lining material, a reaction force receiving member embedded in the lining material, an inner formwork, or the like.

(Problems to be Solved by the Invention) However, the above-mentioned conventional on-site lining construction method had the following problems.

The inner formwork is dismantled from the section where a predetermined strength has been achieved, transported to the face side and reassembled to form a new lining material injection space, but since this involves underground work, workability and There are safety issues.

The method of obtaining a propulsion reaction force by pressurizing the lining material has a negative effect on the lining material that has not yet solidified, and the pressing force and pressurizing time cannot be adequately controlled.

With the method of obtaining the propulsion reaction force using reaction force receiving members or inner formwork, early strength of the lining material cannot be obtained and the construction cycle becomes longer.

Although there is a method of separately controlling the pressure jacking for the lining material and the propulsion jacking as separate systems of jacking, this management method is difficult and requires space for installing the jacking, which results in a small work space.

The present invention was made in view of the above-mentioned problems, and its purpose is to shorten the construction period by improving workability and safety, and to provide a method for on-site lining of shield tunnels that allows for a large work space. The purpose of the present invention is to provide a construction method and its lining equipment.

(Means for Solving the Problems) The gist of the on-site lining construction method for shield tunnels of the first invention for achieving the above-mentioned problems is that the tail part of the shield machine, the inner formwork, the press ring, and the existing lining are In an on-site lining construction method for a shield tunnel in which a lining material is injected into an enclosed lining material injection space and the lining material is cured under pressure, deformation of the inner formwork is prevented by a deformation prevention ring. Then, the shield machine is propelled by the shield jack and slide jack using the pressure applied to the lining material through the press ring as a reaction force, and the deformation prevention ring and the slide jack, press jack and tension jack are used to propel the shield machine. By working together with the jack, the entire inner formwork is slid a predetermined distance toward the face side, and the shield jack and slide jack pull the press ring back to a predetermined position on the face side, thereby preparing the next process. A lining material injection space is formed, and the gist of the on-site lining device for a shield tunnel of the second invention is an on-site lining device for a shield tunnel that includes a shield machine main body, an inner formwork, and a press ring. A plurality of shield jacks that abut the press ring and propel the shield machine; and a plurality of slide jacks that abut the press ring and slide the inner formwork toward the face side. Deformation prevention rings are arranged alternately on concentric circles outward from the installation position of the inner formwork, and the inner formwork includes deformation prevention rings for preventing deformation thereof, and multiple sets of pressers for sliding the inner formwork toward the face side. The jack and the tension jack are respectively arranged at appropriate positions.

(Function) In the first invention, pressure is applied to the lining material cast on site through a press ring, and the shield machine is propelled by using the pressure force as a reaction force, and the lining material injection space for the next process is created in the inner mold. Forming by sliding the frame enables rapid formation of a space for injecting lining material for the next process, and the construction period can be significantly shortened compared to conventional construction methods.

In addition, the deformation prevention ring prevents deformation of the inner formwork when pressurizing the lining material, ensuring an appropriate propulsion reaction force without adversely affecting the lining material, and reducing the pressing force, pressing time, and This makes it possible to easily manage the jacking control.

Further, in the second invention, the deformation prevention ring is in contact with the inner formwork, and by controlling the frictional force, a slide jack, a pressure jack, and a tension jack for sliding the inner formwork can be used. Through the joint action of the above, it is possible to safely and reliably slide the inner formwork into a predetermined position on the face side.

Moreover, by alternately disposing the shield jack and the slide jack on concentric circles outward from the inner formwork installation position, they can perform their functions without reducing the work space.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, an embodiment of the first invention will be described based on FIGS. 1 to 5.

The lining device of the second invention is used in the lining method of the first invention.

This lining device 1 includes a front inner formwork 2a, a front inner formwork 2a,
An inner frame 2 consisting of a middle inner frame 2b and a rear inner frame 2cb is assembled in an annular shape.

An annular press ring 11 that presses the lining material is slidably fitted to the front end of the inner formwork 2 on the face side, and a plurality of shield jacks 10 and Slide jacks 8 are arranged alternately on concentric circles.

The shield jack 10 is fixed to a plate 9 fixed to the steel shell of the main body of the shield machine 5, and presses the lining material through a press ring 11, and also shields by the reaction force when the lining material is pressurized. This is what propels the machine 5.

On the other hand, the slide jack 8
It is fixed to the plate 7 fixed to the front end of the press ring 11, pressurizes the lining material through the press ring 11, and slides the inner formwork 2 toward the face side by the reaction force when the lining material is pressurized. It is. Therefore, the inner formwork 2 in this portion is provided to protrude toward the face side by one piece (by the jacking stroke).

The press ring 11 is airtightly inserted between the shield machine 5 and the inner formwork 2 with a sealing material 12, and the shield jack 10 and the slide jack 8 are compressed via a fitting jig 18. It is designed so that it can be pulled back to the face side by action (see Figure 5).

In addition, it is necessary to leave the inner formwork 2 in place until the lining material develops a predetermined strength.
Several to ten rings of inner formwork units of unit length are connected.

These front inner formwork 2a, middle inner formwork 2b,
The rear inner formwork 2c is stiffened by stiffening ribs 16 and 17, and in order to further prevent its deformation, a plurality of deformation prevention means are arranged at appropriate locations on the inner peripheral surface. .

The deformation prevention means consists of a deformation prevention ring 3 and a hydraulic jack 4, which are divided into two parts, and when the jack 4 is expanded, the deformation prevention ring 3 is brought into close contact with the inner form 2, so that the inner mold is prevented when the lining material is pressurized. In addition to preventing deformation of the frame 2, as will be described later, it is possible to obtain a jacking reaction force when the inner formwork slides, and by loosening the deformation prevention ring 3 due to contraction of the jacker 4, the inner formwork 2 is moved toward the face side. It has the effect of smoothly sliding.

Next, an on-site lining construction method for shield tunnels using the above-mentioned lining device will be explained.

A lining material injection pipe 20 installed from the inner surface of the inner formwork 2 into a lining material injection space 19 surrounded by the tail part of the shield machine 5, the inner formwork 2, the press ring 11, and the existing lining 6. Inject the specified amount of lining material.

Concrete is generally used as this lining material, but it is preferable to select a material that develops strength quickly, such as early-strengthening concrete or fiber-reinforced concrete.

After injecting the lining material, the shield jack 10 and slide jack 8 are inserted through the press ring 11.
The expansion pressurizes the lining material that has not hardened yet, and uses this pressurizing force as a reaction force to propel the shield machine 5.

At this time, by keeping the deformation prevention ring 3 in close contact with the inner formwork 2 with jacks 4, it is possible to prevent the inner formwork 2 from deforming. can proceed.

In addition, since it is possible to easily maintain a pressing force on the lining material for a certain period of time, excess water in the lining material is dehydrated, thereby ensuring early strength and improving the quality of the lining material.

Next, after loosening the deformation prevention ring 3 by contraction of the jacks 4, the slide jacks 8 are extended, a reaction force is applied to the lining material via the press ring 11, and the inner formwork 2 is moved toward the face side. Slide it.

In this case, if the total length of the inner formwork 2 is long, it is difficult to slide the entire inner formwork 2 with only the slide jack 8, so the inner formwork 2 is moved by the following inner formwork 2 sliding means. Perform slide 2.

That is, as shown in FIG.
It is divided into three sections, and a deformation prevention means consisting of a set of deformation prevention ring 3 and hydraulic jack 4 is installed in each section, and a plurality of pressure jacks 13 and tension jacks 14 (Fig. (shows an example using a center hole jack) and the front inner formwork 2a and the middle inner formwork 2.
b. They are fixed and arranged alternately at the connection part with the rear inner formwork 2c.

Then, the front inner formwork 2a, the middle inner formwork 2b,
The inner formwork 2 is alternately slid toward the face side in the order of the rear inner formwork 2c. In the figure, 15 is a tensile member provided in the inner formwork 2.

First, when sliding the front inner formwork a, with the front deformation prevention ring 3 loosened, a force is applied to pull the front inner formwork 2a toward the face side by contraction of the slide jack 8, and the middle part is prevented from deformation. While the ring 3a is brought into close contact with the intermediate internal formwork 2b to absorb the reaction force, a pressing force is applied to the front internal formwork a by extension of the front pressing jack 13. This results in
The front inner formwork 2a can be easily slid toward the face side.

Next, loosen the intermediate deformation prevention ring 3a,
Front deformation prevention ring 3 and rear deformation prevention ring 3
b is brought into close contact with the front inner formwork 2a and the rear inner formwork 2c to take the reaction force, and the intermediate inner formwork 2b is moved to the face by the contraction action of the tension jack 14 and the extension action of the rear pressing jack 13b. Slide it to the side.

Finally, loosen the rear deformation prevention ring 3b, bring the intermediate deformation prevention ring 3a into close contact with the intermediate inner formwork 2b, and while taking the reaction force, press the rear tension jack 1.
The contraction action of 4b causes the rear inner formwork 2c to slide toward the face side.

In the above procedure, the pressure jacks and tension jacks that are not used are left in a free state.

After the sliding of the inner formwork 2 toward the face side for one cycle of construction length (one ring) is completed in this way, the shield jack 10 and the slide jack 8 are contracted, and the fitting jig is The press ring 11 is pulled back to a predetermined position on the face side via the press ring 18 to form a lining material injection space 19 for the next process.

In this embodiment, the on-site lining of a shield tunnel is constructed by sequentially repeating the above operations.

(Effects of the Invention) The present invention has the following effects by having the above configuration.

Since the entire inner formwork is slid toward the face side to form a new lining material injection space, there is no need to dismantle, transport, and reassemble the inner formwork, significantly shortening the construction period compared to conventional construction methods. can do.

Since we have taken measures to prevent the inner formwork from deforming when pressurizing the lining material, it is possible to prevent adverse effects on the lining material, and it is also possible to easily manage the maintenance of the specified pressing force and pressurizing time. be able to.

Since the deformation prevention ring is provided, deformation of the inner formwork can be prevented and adverse effects on the lining material can be prevented, making it easier to manage the pressure applied to the lining material.

Shield jack and slide jack,
Since they are arranged alternately on concentric circles outside the inner formwork position, the work space for pouring lining material, discharging excavated soil, etc. can be expanded.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a tunnel being excavated by a shield machine, Figure 2 is a cross-sectional view taken along line a-a in Figure 1, Figure 3 is a cross-sectional view taken along line b-b in the same figure, and Figure 4 is a cross-sectional view taken along line a-a in Figure 1. The figure is a sectional view taken along the line c-c in the figure, and FIG. 5 is a partial sectional view of the press ring. 1: Lining device, 2: Inner formwork, 3: Deformation prevention ring, 4: Hydraulic jack, 5: Shield machine,
6: Existing lining, 8: Slide jack, 9: Plate, 10: Shield jack, 11: Press ring, 13: Pressing jack, 14: Tension jack.

Claims (1)

[Claims] 1. A lining material is injected into a lining material injection space surrounded by the tail portion of a shield machine, an inner formwork, a press ring, and an existing lining, and the lining material is cured under pressure. In the on-site lining construction method for the shield tunnel,
After preventing deformation of the inner formwork by the deformation prevention ring, the shield machine is propelled by a shield jack and a slide jack using the pressure applied to the lining material through the press ring as a reaction force, Due to the joint action of the deformation prevention ring, the slide jack, the pressure jack, and the tension jack, the entire inner mold is slid a predetermined distance toward the face side, and the shield jack and slide jack move the press ring to a predetermined position on the face side. An on-site lining construction method for a shield tunnel, which is characterized by forming a space for injecting lining material for the next process by pulling it back into position. 2. An on-site lining device for a shield tunnel that includes a shield machine main body, an inner formwork, and a press ring, which includes a plurality of shield jacks that come into contact with the press ring and propel the shield machine, and a plurality of shield jacks that abut the press ring and propel the shield machine; A plurality of slide jacks that come into contact with each other and slide the inner formwork toward the face side are arranged alternately on concentric circles outward from the installation position of the inner formwork, and the inner formwork is provided with a plurality of slide jacks that cause the inner formwork to be deformed. This on-site lining equipment for shield tunnels is characterized by comprising an anti-deformation ring for preventing deformation, and a plurality of sets of pressure jacks and tension jacks for sliding the inner formwork toward the face side, each of which is arranged at an appropriate position.