JPH0718980A - Tunnel boring machine - Google Patents

Abstract

PURPOSE:To effect a preliminary treatment of excavation such as prior ground investigation or ground improvement, by improving the working efficiency of excavation and accurately cutting a boring hole in the heading of a tunnel line expected to excavate. CONSTITUTION:In a tunnel boring machine provided with the machine body and the cutter head 10 rotatably supported by the machine body and equipped with a cutter face at the front face in the excavating direction, it is provided with the cutter head of which a part can be moved separately to the inside in front of the excavator and a cylinder member 23 to slide the separately movable part 15 of cutter head. The separately movable part of cutter head slides in accordance with the extention of cylinder member to set a clearance (h) between the end of separately movable part of cutter head and the tunnel wall 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a tunnel boring machine, and more particularly to a tunnel boring machine having a partially separable and slidable cutter head.

[0002]

2. Description of the Related Art Generally, a tunnel boring machine excavates a tunnel by excavating a cutter face while rotating a cutter head. In the middle of the excavation, the excavation ground is searched forward, and when the front excavation ground is weak, In some cases, pre-processing work such as forefront work such as fore pile and grout and ground improvement is performed.

In order to perform this pretreatment work, the excavator is largely retracted from the face of the face, and then the front face of the face is taken out and the horizontal shaft or the upper shaft is bored by hand digging or blasting.
As shown in FIG. 3, there is a case in which ground improvement such as press-fitting the chemical liquid 72 into the ground 70 is performed after the boring hole 71 is formed diagonally forward from the rear of the cutter head 73.

[0004]

However, the above-mentioned conventional work on the front face of a face has a defect in safety, which affects work efficiency and causes a problem in terms of construction period and economy. In addition, since the tunnel boring machine drills diagonally forward and installs a transmitter for front ground exploration in the boring hole, and injects a chemical solution for ground improvement, it is possible to position it from the ground actually excavated. However, there is a problem that it is difficult to obtain a reliable ground exploration result and the chemical solution is injected into a useless range, so that the work efficiency is reduced and the construction period is affected.

The present invention has been made to solve the above-mentioned problems, and its purpose is to improve the work efficiency of excavation, and further to accurately form a boring pit on the ground to the excavation destination in the tunnel line where excavation is planned. An object of the present invention is to provide a tunnel boring machine which is capable of performing a pre-excavation process such as drilling of a ground on the other side and ground improvement or the like accurately and efficiently.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above object, and its gist is to provide an apparatus main body and a cutter surface rotatably supported by the apparatus main body in the front of the excavation direction. In a tunnel boring machine equipped with a cutter head, a part of which comprises a cutter head that is separately movable toward the inside of the front of the excavation, and a cylinder member for sliding the separation movable part of the cutter head,
There is provided a tunnel boring machine capable of sliding the cutter head separation movable portion by extending the cylinder member to provide a gap between the end of the cutter head separation movable portion and a pit wall.

[0007]

In the tunnel boring machine of the present invention, the cylinder member provided in the cutter head separating portion is extended, and the cutter head separating portion is slid diagonally inward toward the front of the excavation. Preliminary treatment such as ground improvement, pre-construction, or ground exploration by drilling a boring hole in the ground in the tunnel line where the excavation is planned Perform pretreatment work such as ground improvement in tunnel excavation that was used for work.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tunnel boring machine according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a side view of the tunnel boring machine of the present invention installed in a tunnel excavation pit. This tunnel boring machine is mainly composed of a cutter head 10 located in front of the excavation direction, a main beam 20 as an apparatus main body that supports the cutter head 10, and a gripper portion 30 for taking a reaction force from excavation. To be done.

Conventionally, the cutter head 10 has a circular cutter surface 11 on the front surface in the direction of excavation, and a large number of excavating cutters 12 are arranged on the cutter surface 11, and the cutter head 10 is rotated by an electric motor 14. The face 2 is excavated by driving.

The cutter head 10 of the present invention can be divided into a cutter head fixing portion 13 and a cutter head separating movable portion 15 in addition to the above conventional structure, which are fixed to a cutter head support 19. . This 2
The two parts 13 and 15 have a pin 17 through a link 16.
a, 17b and removable bolts (not shown)
They are integrally connected to each other at an oblique joint surface 18 that faces inward in the front of the excavation.

The main beam 20 has a gripper portion 30 slidably fitted to the main beam 20 in the rear portion thereof, and further, behind the gripper portion 30, the gripper portion 30 is unlocked. On the occasion, the main beam 20
A rear support 24 for supporting the vehicle from below is disposed, and the rear support 24 has a structure capable of expanding and contracting due to a cylinder structure.

The gripper portion 30 is provided with a gripper cylinder 31 which is capable of expanding and contracting from the main beam 20 on both sides in the horizontal direction, and a gripper shoe 32 which is curved in an arc shape along the pit wall 1 is arranged at the tip end portion thereof. ing. When the excavation reaction force is applied, the gripper cylinder 31 is extended and the pit wall 1 is pressed by the gripper shoe 32 to fix the gripper portion 30 at this position. In addition, the base end portion of the thrust cylinder 25 is connected to the gripper portion 3
It is fixed to 0, and the tip is fixed to the main frame 20 side as the machine body. At the time of excavation, by extending the thrust cylinder 25, the reaction force is applied to the gripper part 30 fixed as described above, Frame 2
The cutter drum 10 is moved forward integrally with zero.

The excavation is continued in this way, and the excavation is temporarily stopped at the time when the excavation is carried out over a predetermined span. At this time, the rear support 24 at the rear end is extended so that the main beam 20 can be supported. Then the gripper cylinder 3
1 is contracted to release the gripper portion 30 from being fixed. At this time, the main beam 20 is supported by the rear support 24. Next, the thrust cylinder 25 is contracted, the gripper portion 30 is moved to the above-mentioned initial position,
Prepare for the next excavation. By repeating such a process, the tunnels are sequentially excavated.

Further, the tunnel boring machine has
A cutter drum support 2 is provided below the cutter head 10.
6 and the roof support 2 above the main beam 20.
No. 1 is arranged, and these are also supported while being vertically supported.

Next, a pretreatment work using the above tunnel boring machine, for example, a method of improving the ground to be excavated will be described.

When performing the pretreatment work, the excavation is temporarily stopped and the cutter head 10 is retracted to a predetermined position. Next, the bolts fixing the cutter head fixing portion 13 and the cutter head separating movable portion 15 are removed, and the cylinder 23 arranged on the roof support 21 is extended. As a result, the link 16 moves back, the cutter head separation movable portion 15 slid on the joint surface 18 inward toward the front of the excavation, and a gap is formed between the upper end of the cutter head separation movable portion 15 and the pit wall 1. empty h

Then, a boring machine 43 attached via cylinders 42 and 44 to a pedestal 41 fixed on the main frame 20 of the tunnel boring machine is driven, and a boring hole 40 is bored at a required position on the upper face of the face through a gap h. Set up. The cylinders 42 and 44 adjust the vertical movement and tilting movement of the boring machine 43.

Thus, the same boring machine 43
Inject a chemical liquid such as cement milk or quick-setting adhesive from around the nozzle at the tip of. This chemical liquid injection also serves as a boring machine as shown in FIG. 1, but a separate injection device may be used.

By restarting excavation of the tunnel boring machine after the ground is improved in this way, spouting of groundwater and collapse of the ground into the tunnel are prevented.

In addition to the ground improvement as a pretreatment work in the present invention, an ultrasonic transmitter or receiver for ground exploration is mounted in the boring hole 40 by the ground improvement preparatory method to advance the ground in the excavation direction. You can also research in advance.

[0022]

The tunnel boring machine of the present invention is
A part of the cutter head has a separating part with a cylinder member, and by simply extending this cylinder member, the cutter head separating part slides, and a gap is provided between the end of the cutter head and the pit wall. Since excavation pretreatment such as ground exploration or ground improvement is performed, work efficiency is good, and moreover, excavation pretreatment such as prospective ground exploration and ground improvement can be performed accurately.

[Brief description of drawings]

FIG. 1 is a side view of a tunnel boring machine of the present invention.

FIG. 2 is a side view showing a state in which a chemical solution is injected through a boring hole formed in the tunnel boring machine of the present invention.

FIG. 3 is a side view showing a conventional example.

[Explanation of symbols]

 1 pit wall 2 face 10 cutter head 20 main beam 30 gripper part 40 boring hole 43 boring machine h gap between cutter head and pit wall

Claims (1)

[Claims] 1. A tunnel boring machine comprising a device main body and a cutter head rotatably supported by the device main body, the cutter head having a cutter surface on the front surface in the excavation direction, a cutter head part of which is separably movable inward of the excavation front. A cylinder member for sliding the movable separation part of the cutter head, and extending the cylinder member to slide the movable separation part of the cutter head to provide a gap between the end of the movable separation part of the cutter head and the pit wall. A tunnel boring machine that made it possible.