JPH11173072A - Chemical grouting method and chemical grouting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical grouting method and a chemical grouting equipment capable of improving the ground around a shield tunnel in an early stage after driving in response to the driving work by the shield driving machine without occupying any area above the ground such as roads or the like. SOLUTION: Those used in the method are working scaffoldings 15A, 15B, 15C arranged in a movable manner by sliding in the adit of the shield tunnel 14, a supporting rail 17 arranged in peripheral direction along the interior wall surface in the adit, and a chemical grouting equipment 11 equipped with a boring machine 8 which moves by sliding along the supporting rail 17. Therefore, a grouting mouth pipe 28 is installed at the grout hole 27 formed to a segment 16, grouting pipes 25 are inserted to surrounding ground through the grouting mouth pipes 28, a chemical is grouted using this grouting tubes 25, thereafter, work for pulling out the grouting pipes 25 is repeated and the surrounding ground is improved by the chemical grouting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid injection method and a chemical liquid injection device, and more particularly to a chemical liquid injection method and a chemical liquid injection device for performing an injection operation from inside a shield tunnel.

[0002]

2. Description of the Related Art A shield construction method is employed as a method for constructing a tunnel particularly in an urban area, etc., while performing tunnel excavation work by using a shield excavator, assembling segments and forming a ring-shaped lining body behind. This method protects the inner wall surface of the tunnel by installing it, and forms a shield tunnel by performing excavation work while obtaining propulsion reaction force from the installed lining body.

According to such a shield method, a tunnel may be constructed by passing through soft ground, shallow ground, or ground below an important buried object. In some cases, it may be necessary to improve the ground around the shield tunnel by injecting a chemical solution so as not to adversely affect the ground.

According to the prior art, the ground improvement by chemical injection performed after the tunnel excavation work employs a method of performing chemical injection from the ground toward the ground around the shield tunnel. It had been.

[0005]

However, according to such a conventional method for injecting a chemical solution, since the operation is performed from the ground, for example, the road is occupied,
Due to traffic congestion and work limited to nighttime, there are various restrictions on construction, and it takes a considerable amount of time to prepare for it. There was a problem that it was difficult to improve the surrounding ground.

Therefore, the present invention has been made in view of such a conventional problem, and does not occupy a ground area such as a road, but is accompanied by a digging operation by a shield digging machine. It is an object of the present invention to provide a chemical solution injection method and a chemical solution injection device capable of improving the ground early after excavation work.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a gist of the invention is a method for injecting a chemical solution from a mine in a shield tunnel. A work for installing an injection pipe in a grout hole, inserting the injection pipe into the surrounding ground through the injection pipe, injecting a drug solution using the inserted injection pipe, and then pulling out the injection pipe. Is repeated to improve the surrounding ground by injecting a chemical solution.

[0008] Another aspect of the present invention is a chemical solution injection device used for performing an injection operation from inside a tunnel of a shield tunnel, comprising: a working scaffold arranged to be slidable in the axial direction inside the tunnel tunnel. A supporting rail disposed on the working scaffold and extending in a circumferential direction of the inner wall surface at an interval from the inner wall surface of the mine, and an injection pipe insertion device slidably moved along the supporting rail. A chemical liquid injector is characterized in that:

According to the chemical solution injection method of the present invention, a backfill injection grout hole formed in advance in a segment is used. Install the mouth tube and perform the injection of chemicals. In other words, this makes it possible to inject the chemical solution from inside the tunnel of the shield tunnel, and to improve the ground around the shield tunnel promptly with the excavation work by the shield excavator without the need for work from the ground. It becomes possible.

Further, according to the chemical liquid injector of the present invention,
On a work scaffold that is slidably arranged in the tunnel axis direction, while positioning the injection tube insertion device toward each grout hole while sliding in the circumferential direction along the support rail, the method for injecting a drug solution of the present invention is performed. It can be easily implemented.

[0011]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. According to this embodiment, as shown in FIG. 1, the area of six rings from the third ring to the eighth ring of the ring-shaped lining by the segment 16 behind the shield machine 10 is constructed by the chemical liquid injector. As a target, as the shield machine 10 advances due to the excavation work, the injection operation is performed while the chemical liquid injection device described later is slid forward and the construction target area is sequentially shifted forward.

As shown in FIG. 2, the chemical liquid injection device 11 used in the chemical liquid injection method of this embodiment is installed on a pair of slide rails 13 so as to avoid the belt conveyor 12 for discharging the excavated earth and sand backward. A work scaffold 15 slidable in the axial direction of the tunnel 14 disposed therein.
A, 15B, and 15C (see FIGS. 3, 4, and 5) and a circumferential direction of the inner wall surface on the foremost work scaffold 15A at an interval from a lining inner wall surface of the tunnel 16 underground. Arc-shaped support rail 17 which is extended and provided
And a boring machine 18 as an injection pipe insertion device that slides along the support rail 17.

The work scaffolds 15A, 15B, and 15C are formed by assembling various steel materials such as angle irons and scaffold materials such as gratings. As shown in FIG. It is for drilling work, and in order to avoid the belt conveyor 12, it is assembled in two steps with the center part raised one step, and the belt conveyor 12 passes below it, and FIG. 4 and FIG. As shown in the figure, a central work scaffold 15B for the pouring operation and a rearmost work scaffold 15C for the pouring tube drawing operation are each formed to be flat, and the belt conveyor 12 passes above them. The work scaffolds 15A, 15B, 1
At both ends of 5C, traveling wheels 19 with stoppers are provided, and tunnels 14 along the slide rails 13 are provided.
Can be slid in the axial direction.

On the other hand, as shown in FIGS. 2 and 3, a support rail 17 provided on the foremost work scaffold 15A is formed by bending a pair of H-shaped steel members 20 bent in an arc shape so that their web portions are parallel to each other. The side opening portions are opposed to each other, and the connecting steel members 21 are formed so that the drilling work can be performed simultaneously on the two segments of the segment lining body.
On the work scaffold 15A in an integrated state
The table is installed, and at the time of drilling work, it is firmly supported and fixed from the work scaffold 15A and the inner wall of the lining via the support member 22 (see FIG. 2) and the fixing bracket 23 (see FIG. 3). Has become.

The support rail 17 is supported on the inner surface of the flange of the H-section steel 20 by inserting and disposing wheels at both side ends of the pair of H-section steels 20 facing each other at the side openings. In this state, a swing support cart 24 that slides in the circumferential direction along the support rail 17 is provided in a state where it is pulled by a winch or the like, and a boring machine 18 is fixed to the swing support cart 24 to support the support rail 17. Can be swiveled along.

The boring machine 18 is a known type equipped with a power unit, a hydraulic drill and the like. The boring machine 18 holds the injection pipes 25 connected sequentially according to the stroke length by a chuck 35 and drills holes through a swivel 36. The drilling work is performed while pumping water.

The injection tube 25 is, as shown in FIG.
For example, 40 mm with injection holes provided at a pitch of 600 mm
It comprises a well-known connectable strainer pipe having a diameter of about 2 mm. Inside the pipe, a drilling water pumping pipe 26 for pumping drilling water is provided, and a drill bit 37 is provided at the tip thereof. I have.

On the other hand, according to this embodiment, the grout holes 27 formed in the segments 16 constituting the lining body
(See FIGS. 3 to 5), an inlet pipe 28 for injection is installed in the grout hole 27 in advance.

That is, as shown in FIG. 6, the injection mouth tube 28 is a cylindrical member having a penetrating inner space, which is installed so as to be screwed into the grout hole 27. A lip-shaped sealing ring 29 is attached, and during insertion work of the injection pipe 25,
Grout hole 27 during chemical injection water work, etc.
It is possible to prevent the outflow of earth and sand from flowing out of the gap between the water and the injection pipe 25, and a borehole valve 38 is attached via a nipple 37.

According to this embodiment, as shown in FIG. 2, in parallel with the excavation work by the shield machine 10, the ground around the outer periphery of the ring-shaped lining by the segments 16 installed behind the shield machine 10. In contrast, the operation of injecting the chemical solution from the inside of the shield tunnel 14 is performed.

That is, as shown in FIG. 3, the support rail 17 is placed on the work scaffold 15A provided at the forefront.
The bogie 24 is slid along with the boring machine 18 to support and fix the boring machine 18 so as to face the grout hole 27 in which the injection mouth pipe 28 is installed.
8, the hole insertion operation by the injection pipe 25 is performed. According to this embodiment, since two boring machines 18 are attached to each of the front and rear support rails 17, four drilling holes can be inserted at the same time. The drilling position of the boring machine 18 provided on the rail 17 and the rear support rail 17
By alternately shifting the drilling position by the boring machine 18 provided in the above, the injection pipe 25 is drilled and inserted in four directions for each ring.

On the other hand, on the central work scaffold 15B behind the work scaffold 15A, as shown in FIG. 4, an operation of injecting a chemical solution through an injection pipe 25 inserted and installed in the ground is performed. That is, the support rail 17 and the boring machine 18
Of the injection pipe 2 projecting from the injection port pipe 28 inside the ring-shaped lining by the segment 16 from which
A swivel 30 for supplying a chemical solution is attached to the end of 5, and the chemical solution pumped from the chemical solution supply plant via the swivel 30 is injected into the ground through the injection hole of the injection pipe 25. During the injection work,
Pay attention to the injection pressure and fill the ground with the injection at a low discharge rate. In addition, during the pouring operation, the drilling water pressure feeding pipe 26 provided inside the strainer pipe is used.
Is closed with an obturator.

Further, on the rearmost work scaffold 15C behind the work scaffold 15B, as shown in FIG. 5, the work of pulling out the injection pipe 25 after the injection work is performed. That is, the pull-out operation is performed by attaching the center hole jack 31 to the inner wall surface of the lining by the segments 16. In addition, after the pulling operation, the drawing hose portion of the injection tube 25 is connected to the injection hose again at the mouth to perform the hole filling operation. In general, the air permeability in soil is 7 times the water permeability.
It is said to be 0 to 100 times, and since air passes through the inside of the improved soil, it is judged that no air pool will be generated when filling such a hole.

Then, each of such work scaffolds 15A, 1A
The work from drilling on 5B and 15C to drawing is
As the excavation work is performed by the shield machine 10, the work scaffolds 15A, 15B, and 15C can be smoothly moved while being sequentially slid forward.

That is, according to this embodiment, the chemical solution can be injected from the inside of the shield tunnel, and the surrounding area of the shield tunnel can be excavated by the shield machine without occupying the ground area such as the road. The ground can be improved early after the excavation work.

The present invention is not limited to the embodiment of the above embodiment, but can be variously modified and adopted within the scope of the constitution described in each claim. For example, it is not necessary to provide two support rails 17 on the work scaffold 15A, and it is not necessary to use four boring machines 18 as an injection pipe insertion device.

[0027]

As described above, according to the method for injecting a chemical solution of the present invention, an inlet tube for injection is installed in a grout hole formed in a segment, and the inlet tube is surrounded by the inlet tube for injection. After inserting into the ground and injecting the chemical using the inserted injection pipe, the operation of pulling out the injection pipe is repeated to improve the surrounding ground by injecting the chemical, so the injection work is performed from inside the shield tunnel mine. And the ground around the shield tunnel can be improved early after the excavation work with the excavation work by the shield excavator without occupying a ground area such as a road.

Further, according to the liquid injector of the present invention,
On a work scaffold that is slidably arranged in the tunnel axis direction, while positioning the injection tube insertion device toward each grout hole while sliding in the circumferential direction along the support rail, the method for injecting a drug solution of the present invention is performed. It can be easily implemented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a work area behind a shield machine according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view illustrating a configuration of a drug solution injector according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along AA of FIG. 2;

FIG. 4 is a transverse sectional view taken along the line BB of FIG. 2;

FIG. 5 is a cross-sectional view taken along the line CC of FIG. 2;

FIG. 6 is a cross-sectional view showing an injection mouth tube attached to a grout hole.

FIG. 7 is a longitudinal sectional view showing an example of an injection tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shield machine 11 Chemical liquid injection device 13 Slide rail 14 Shield tunnel 15A, 15B, 15C Work scaffold 16 Segment 17 Support rail 18 Boring machine (Injection pipe insertion device) 19 Running wheel 20 H-shaped steel 24 Swivel support trolley 25 Injection pipe 26 Cutting Hole water pressure pipe 27 Grout hole 28 Injection pipe 29 Seal ring 30 Swivel (for supplying chemical solution) 31 Center hole jack

Claims (2)

[Claims] Claims 1. A method for injecting a chemical solution in which an injection operation is performed from the inside of a shield tunnel pit, wherein an injection mouth pipe is installed in a grout hole formed in a segment, and the injection pipe is surrounded by the injection mouth pipe. A method for injecting a chemical solution, wherein the method is performed by inserting the device into the ground, injecting a chemical solution using the inserted injection tube, and then withdrawing the injection tube to improve the surrounding ground by injecting the chemical solution. 2. A chemical injection device used when performing an injection operation from inside a tunnel of a shield tunnel, comprising: a working scaffold disposed slidably in an axial direction in the tunnel; and a working scaffold disposed on the working scaffold. And a support rail extending in the circumferential direction of the inner wall surface at an interval from the inner wall surface of the pit, and an injection tube insertion device slidably moved along the support rail. .