JPH09184391A - Chemical injection device for tunnel machine - Google Patents

Abstract

(57) [Abstract] [Problem] By installing a chemical injection valve 8a with a chemical injection drill 8b installed at the rear on the cutter head 4, the soil quality of the natural ground is surely and efficiently improved to ensure the safety of tunnel construction. Provided is a chemical liquid injector 8 for a tunnel excavator for improving workability and workability. A tunnel machine having a cutter head (4) rotatably mounted on a front part of a tunnel machine body (1) and a chemical injection device (8) for improving the soil quality of a ground to be excavated, wherein the chemical injection device is provided. Reference numeral 8 denotes a chemical injection valve 8a installed on the cutter head 4, and a chemical solution such as a soil conditioner is injected into the natural rock while passing through the chemical injection valve 8a from the rear of the chemical injection valve 8a to penetrate the natural rock. A rod 8b, a tip cutter 8c installed at the tip of the rod 8b, and a chemical drill installed behind the chemical valve 8a and rotating and extending the tip cutter 8c. 8
A chemical injection device for a tunnel excavator consisting of d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical injection device for a tunnel excavator, and more particularly, by installing a chemical injection valve having a chemical injection drill installed in the rear thereof on a cutter head, the soil quality of the ground can be ensured and reliably. The present invention relates to a chemical injection device for a tunnel excavator for efficiently improving soil quality at any position.

[0002]

2. Description of the Related Art A shield machine shown in FIGS. 6 and 7 will be described as a first conventional technology relating to a chemical injection device for a tunnel machine according to the present invention. At the front end of the shield machine main body 51, a cutter head 53 rotatably driven by a cutter drive motor 52 is rotatably supported by a bearing 54. Thus, the cutter head 53
When the shield machine main body 51 is rotated and is driven by the shield jack 55 by taking a propulsion reaction force from the segment 56, a tunnel is excavated in the ground. By excavating the tunnel, the cutter head 53 and the bulk head 5
The excavated earth and sand taken into the chamber 58 formed between the seven is the chemical injection valve 59 attached to the bulkhead 57.
With a soil-improving material or a water-stopping material injected into the ground in front of the cutter head, the material is improved to have a predetermined hardness or water-stopping soil. Further, from the chemical injection valve 65 installed on the skin plate 64 at the front end of the shield machine main body 51, chemical injection such as a soil improvement material or a water blocking material is performed in the void or the ground.

As a second conventional technique relating to the chemical injection device for the tunnel excavator according to the present invention, there is a method for injecting a soil improvement material from the ground as shown in FIG. The position of the obstacle that is known in advance or the position of the obstacle that is found by the radar installed in the tunnel machine is located on the ground.
The chemical injection device 70 shown in (1) is carried and the soil improvement material is injected from the ground to the vicinity of the position of the obstacle.

First, the structure of the chemical injection device 70 will be described. The chemical injection drill 72 is installed on the upper portion of the main body 71, and also has a rotation motor 74 for rotating the injection tube rod 73.
And a propulsion motor 75 for expanding and contracting the injection tube rod 73. An injection pipe rod 73 is mounted below the chemical injection drill 72, and a ball valve 76 that penetrates the injection pipe rod 73 is fixed inside the main body 71. A tip cutter 77 is attached to the tip of the injection pipe rod 73. Is installed. The injection tube rod 73 has a rod connecting portion 73a at its end.
A unit injection pipe rod 73e having a length L formed by a rod portion 73b having a space and a spacer pipe 73d which covers the outside of the rod portion 73b and has a spacer pipe connecting portion 73c at an end thereof. The length can be adjusted by connecting with the part 73a and the spacer pipe connecting part 73c.

Next, the operation of the chemical injection device 70 will be described. When the tunnel excavator encounters an obstacle, it carries the chemical injection device 70 to a position on the ground corresponding to the obstacle, rotates the injection pipe rod 73 by the rotation motor 74, and rotates the injection pipe rod 73 by the propulsion motor 75. When a thrust is applied to the tip end cutter 7 installed at the tip of the injection tube rod 73.
The ground 78 is excavated by 7. When excavating the ground 78 for the length L by the tip cutter 77, the propulsion motor 75
Thus, the injection pipe rod 73 is contracted by the length L, the unit injection pipe rod 73e is connected to the space, and the ground 78 is excavated by the length L. In this way, the tip cutter 7
When 7 is in the vicinity of an obstacle or on soft ground and cannot be excavated according to the planned line and protective work must be performed, or when a cutter or other replacement point is reached, a chemical liquid injection pipe (not shown) is used to inject the injection pipe rod. After the soil improvement material was injected through 73 to improve the ground, the work of removing obstacles, the work of protection construction, the work of exchanging cutters, etc. were performed. When the chemical injection is not performed, the injection pipe rod 73 is retracted from the inside of the ball valve 76, and the ball valve 76 is closed to protect the injection pipe rod 73.

[0006]

However, the first conventional technique has the following problems. (1) In the injection from the bulk head 57 side, there were obstacles such as the cutter head center connecting member, the spokes, and the face plate in the center portion of the cutter head 53, and it was difficult to inject into the arbitrary position. (2) From the chemical injection valve 65 installed on the outer periphery of the skin plate 64, the soil improvement agent is chemically injected into the voids and the ground to perform the protection work around the outer diameter of the shield excavation. As a result, the installation position was limited, and the installation position of the chemical injection drill was also limited, which made it difficult to construct a complete peripheral protection work. Further, the second conventional technique has the following problems. (3) Since it is difficult to know the exact position on the ground corresponding to the position of the obstacle, it is necessary to widen the range of chemical injection, which requires a lot of soil improvement material, which is uneconomical and increases the number of chemical injection steps. To do. (4) In the position where buildings are densely located on the ground, the chemical injection device 7
I can't carry 0. (5) In the case of curved tunnel alignment, there may be cases where the ground cannot be improved from the ground.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and by installing a chemical injection valve having a chemical injection drill behind it in the cutter head, the soil quality of the natural ground can be ensured. Provided is a chemical injection device for a tunnel excavator for improving efficiency and efficiency in tunnel construction by improving the efficiency and efficiency.

[0008]

In order to achieve the above object, a chemical injection device for a tunnel machine according to a first aspect of the present invention is a cutter head rotatably mounted on a front portion of a tunnel machine body. In the tunnel machine having a chemical injection device for improving the soil quality of the ground, the chemical injection device is a chemical injection valve installed in the cutter head, and the inside of the chemical injection valve from the rear of this chemical injection valve. A chemical injection rod that injects a chemical solution such as a soil improvement agent into the natural ground while passing through it and a tip cutter installed at the tip of this chemical injection rod, and is installed behind the chemical injection valve. In addition, it comprises a chemical injection drill for rotating and expanding / contracting the tip cutter.

In the chemical injection device for a tunnel excavator according to the first aspect of the present invention, when improving the soil quality of the ground to be excavated,
After stopping the excavation of the tunnel excavator, the tip cutter is driven to rotate and extend through the chemical rod by the chemical drill, and the chemical valve installed on the cutter head is opened, and the chemical injection is performed inside the chemical valve. After passing through the rod and the tip cutter to penetrate into the natural ground, a chemical solution such as a soil improvement agent is injected into the natural ground to improve the soil quality of the natural ground. When the soil improvement of the ground to be excavated is completed, the tip cutter is contracted and driven by the chemical injection drill via the chemical injection rod, and the tip cutter retracts from the chemical injection valve installed in the cutter head. After that, the chemical injection valve is closed, the inside of the cutter head is sealed from the ground, and the tunnel machine is excavated.

Therefore, the following effects can be obtained. (1) Since the chemical injection rod can penetrate forward from the vicinity of the front surface of the cutter head, the chemical injection position is not limited by the cutter head spoke, the center shaft, the cutter head face plate, etc. All sections can be improved. (2) Since the chemical injection rod penetrates from a position near the face,
It is possible to reliably inject the soil improvement material into any position where chemicals are desired to be injected. Moreover, the consumption of soil improvement material can be reduced, which is economical. (3) The ground near the cutter head can be improved, and an unexpected trouble (for example, the cutter head is blocked, the chamber is closed, etc.) can be quickly dealt with.

A chemical injection device for a tunnel excavator according to a second aspect of the present invention is the chemical injection device according to the first aspect, wherein the chemical injection valve is installed in a central portion of the cutter head.

In the chemical injection device for the tunnel excavator according to the second aspect of the invention, since the chemical injection valve is installed in the central portion of the cutter head, the chemical injection position is limited by the cutter head spokes, the center shaft, the cutter head face plate and the like. It is possible to pierce the chemical injection rod almost parallel to the tunnel excavation direction without any need to improve, and to improve the ground at any position.

A third aspect of the present invention is a chemical injection device for a tunnel excavator according to the first aspect, wherein the chemical injection valve is attached to a cutter head via a universal joint.

In the liquid injector of the tunnel excavator according to the third aspect of the invention, since the chemical injection valve and the chemical injection rod are provided on the cutter head through the universal joint, the universal joint changes the penetrating direction of the chemical injection rod. Since injection can be performed, a wide range of chemicals can be injected and the number of chemical injection valves installed can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Each embodiment of a chemical injection device for a tunnel excavator according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing an embodiment of a chemical liquid injector for a tunnel machine according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. FIG. 5 is a diagram showing the chemical liquid injector shown in FIG. 1, and FIG. 5 is a detailed view of a P portion of FIG.

A chemical injection device for a tunnel machine according to the present invention will be described with reference to FIGS. At the front of the tunnel machine main body 1, a cutter head 4 composed of a plurality of radially extending spokes 2 and a cutter head face plate 3 fixed to the front of the spokes 2 for cutter attachment is rotatably mounted. Has been done. The cutter head 4 is rotationally driven by a cutter head drive motor 5 installed in the tunnel excavator body 1. Among the plurality of spokes 2 forming the cutter head 4, the spoke 2 located at one diameter portion is formed thicker in the front-rear direction than the other spokes 2, and the cutter head face plate 3 and the cutter head face plate 3 are formed. The spokes 2 fixed to the rear of the work space 6 form a work space 6 that is installed in a sealed manner. A human can pass through the working space 6 in the radial direction of the cutter head 4 by means of the moving stairs 7, and a plurality of chemical liquid injections installed in the radial direction of the cutter head 4 by riding on a scaffold 13 installed at a predetermined position. The device (hereinafter referred to as a chemical injection device) 8 can be operated arbitrarily.
A cutter bit 9 is fixed to the front portion of the spoke 2, and a preceding bit 10 is fixed between the cutter bits 9.

A center shaft 12 is fixed to the center of a bulkhead 11 fixed to the main body 1 of the tunnel machine, and a cutter head fitting portion 4a is fitted to the front end 12a of the center shaft 12. The fitting portion 12b is formed, and the sliding portion is sealed by the seal 14. An injection valve 16 for injecting water, an additive, or the like into the chamber 15 is installed in the center shaft 12, and a manlock 17 is fixed to the rear of the center shaft 12.

At the center of the cutter head 4, a chemical injection device 8 is provided.
4 chemical injection valves 8a, which will be described later, are installed. Inside the center shaft 12 located behind the chemical injection valves 8a, the soil improvement agent is injected into the ground through the chemical injection valves 8a. And a chemical-drilling rod 8b, which has a tip cutter 8c at the tip, which will be described later, which constitutes the chemical-dispensing device 8, and a chemical-drill 8 which drives the chemical-rod 8b to rotate and extend and retract.
d and are arranged. Further, one diametrical spoke 2 of the cutter head 4 is formed thick in the front-rear direction,
The front plate 20 of the spoke 2 has eight chemical injection valves 8a.
Is provided, and a chemical injection hole 18 through which the chemical injection rod 8b can pass is formed at a position of the cutter head face plate 3 corresponding to each chemical injection valve 8a.

The chemical injection device 8 will be described with reference to FIGS. 4 and 5. The chemical injection devices 8 are installed in the central portion of the cutter head 4 in the number of four and eight in the diameter direction of the cutter head 4 in common. The chemical injection device 8 penetrates into the natural rock through the chemical injection valve 8a installed on the cutter head 4 and the rear of the chemical injection valve 8a through the inside of the chemical injection valve 8a, and at the same time, the soil improvement material is applied to the natural rock. The chemical injection rod 8b to be injected, the tip cutter 8c installed at the tip of the chemical injection rod 8b, the tip cutter 8c installed behind the chemical injection valve 8a, and the tip cutter 8c via the chemical injection rod 8b. It is composed of a chemical injection drill 8d which is driven to rotate and extend and contract.

The chemical injection valve 8a comprises a spherical joint 8a1 attached to the cutter head 4, and a ball valve 8a2 which is opened when the chemical injection rod 8b passes and is closed when the chemical injection rod 8b does not pass. Further, the drug-dispensing rod 8b is connected to a tip-end drug-dispensing rod 8b3 composed of a rod portion 8b1 having a tip-end cutter 8c at its tip, and a spacer tube 8b2 covering the rod portion 8b3, and a rear part thereof, and at the end thereof. It comprises a rod portion 8b4 having a connecting portion and a spacer tube 8b5 having a connecting portion at the end thereof while covering the rod portion 8b4, and a chemical injection rod unit 8b6 having a length L. Ball valve 8a2
The spacer tube 8b2 and the spacer tube 8b5 are sealed by a water blocking seal 8e.

The operation of the above configuration will be described. When the cutter head 4 rotatably attached to the front part of the tunnel excavator main body 1 is rotationally driven by the cutter drive motor 5, the ground ahead is excavated. When an obstacle such as a foundation pile is found in front by the radar 19 installed in the tunnel machine, the position is detected, and the tunnel machine is excavated to the vicinity of the obstacle and stopped. After that, the chemical injection drill 8
The distal end cutter 8c is driven to rotate and extend through the chemical injection rod 8b by d to open the chemical injection valve 8a installed in the cutter head 4, and the chemical injection rod 8b and the distal end cutter 8c are inserted into the chemical injection valve 8a. After passing through and to penetrate into the ground, soil improvement material is injected into the ground to improve the soil quality of the ground to be excavated. When the soil improvement of the ground to be excavated is completed, the tip end cutter 8c is driven to rotate and contract by the chemical injection drill 8d via the chemical injection rod 8b, and the inside of the chemical injection valve 8a installed in the cutter head 4 is driven. To tip cutter 8c
After the withdrawal, the chemical injection valve 8a is closed, the inside of the cutter head 4 is sealed from the ground, and the tunnel excavator is advanced.

If necessary, a person can move by means of the moving stairs 7 installed on the spokes 2, and the soil in the front can be selectively improved by a predetermined chemical injection device 8. In addition, the center shaft 1 fixed to the tunnel machine 1
2 Since the cutter head fitting portion 4a is provided at the front end,
The part of the center shaft 12 that does not rotate becomes long, which makes it easier for a person to pass from the man lock 17 to the cutter head 4, and also makes it easier to install the chemical injection drill 8d and the like.

As described above, since the entire cross section of the face can be improved with the outer diameter larger than the outer diameter of the shield, a person can enter the chamber, and the cutters can be replaced or the chamber can be easily inspected. At the same time, when an obstacle appears in front of the tunnel machine, the obstacle can be removed. Further, the protective construction work can be carried out safely and efficiently.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a cutter head structure of a tunnel machine according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a diagram showing the chemical liquid injector shown in FIG. 1.

5 is a detailed view of a P portion of FIG.

FIG. 6 is a diagram showing a first conventional technique.

FIG. 7 is a front view of FIG.

FIG. 8 is a diagram showing a second conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tunnel excavator body, 2 ... Spokes, 3 ... Cutter head face plate, 4 ... Cutter head, 4a ... Cutter head fitting part, 5 ... Cutter head drive motor, 6 ... Cutter head,
4a ... Cutter head fitting portion, 5 ... Work space, 7 ... Movement stairs, 8 ... Medicine liquid injection device (chemical injection device), 8a ... Mechanical injection valve, 8a1 ... Spherical joint, 8a2 ... Ball valve,
8a3 ... Handle, 8b ... Chemical injection rod, 8b1 ... Rod part, 8b2 ... Spacer tube, 8b3 ... Tip chemical injection rod,
8b4 ... Rod connecting part, 8b5 ... Spacer tube connecting part, 8
b6 ... Chemical injection rod unit, 8c ... Tip cutter, 8d
… Chemical injection drill, 8d1… Rotation motor, 8d2… Propulsion motor, 8e… Water stop seal, 9… Cutter bit, 10…
Leading bit, 11 ... Bulkhead, 12 ... Center shaft, 12a ... Front end portion, 12b ... Fitting portion, 13 ... Scaffolding, 1
4 ... Seal, 15 ... Chamber, 16 ... Injection valve, 17
... Manlock, 18 ... Medication injection hole, 19 ... Radar, 20 ... Front plate.

Claims (3)

[Claims] 1. A tunnel excavator having a cutter head rotatably mounted on a front portion of a tunnel excavator main body, and a chemical injection device for improving soil quality of ground to be excavated,
The chemical injection device is a chemical injection valve installed in the cutter head, and penetrates into the natural ground from behind the chemical injection valve through the chemical injection valve and injects a chemical solution such as a soil improvement agent into the natural rock. It is characterized by comprising a chemical dosing rod, a tip cutter installed at the tip of the chemical dosing rod, and a chemical dosing drill installed at the rear of the chemical dosing valve and rotating and extending and retracting the tip cutter. A chemical injection device for a tunnel machine. 2. The chemical injection device for a tunnel excavator according to claim 1, wherein the chemical injection valve is installed in a central portion of the cutter head. 3. The chemical injection device for a tunnel excavator according to claim 1, wherein the chemical injection valve is attached to the cutter head through a universal joint.