JP2889381B2 - Primary tunnel lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary lining method of a tunnel, and more particularly to a primary lining method of a tunnel in a method of excavating a tunnel using a full-section tunnel boring machine. is there.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a tunnel in a bedrock, a cutter head which is rotatably mounted on a cutter head support and is equipped with a cutter on a front surface, and a drilling reaction force is applied to a pit wall. There is known a method of performing tunnel excavation using a full-section type tunnel boring machine including a gripper device, a thrust cylinder connecting the gripper device and a cutter head, and a shearing-out device for unloading excavation waste.

[0003] The tunnel boring machine of the full cross section takes excavation reaction force by a gripper device fixed to a pit wall, and excavates by rotating a cutter head while pressing a cutter against a face with a thrust cylinder. To prevent the excavated tunnel from collapsing, build a steel shoring behind the cutter head or spray concrete on the pit wall to construct the tunnel. The law is known.

[0004]

In the above-mentioned conventional tunnel construction method using a full-section type tunnel boring machine, the above-described tunnel boring machine employs a structure in which a back portion of a cutter head support which is a support member of a cutter head for excavating a face is provided. Since the primary lining has been performed, the time from excavation of the facet to the work of supporting the primary lining is long, and during this time, the ground loosens due to cracks etc. May be. In this way, if the ground loosens, the operating rate of the tunnel boring machine will drop significantly.

[0005] In a shield method known as a conventional tunnel construction method, segments are assembled in a shield machine to perform primary lining. Not only had to be interrupted, but also required extra equipment for assembling the segments, the segments themselves were expensive, and the graft material had to be injected into the space behind the segments.

As described above, the conventional type has poor workability and is expensive. Therefore, a technical problem to be solved arises in order to use a tunnel boring machine in order to make tunnel excavation inexpensive, and to significantly improve the operation rate and excavation speed of tunnel excavation by the tunnel boring machine. Therefore, an object of the present invention is to solve the problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and has a full-section tunnel.
This is a method of tunnel excavation using a boring machine.
Therefore, the tunnel boring machine has a cutter at the front end.
Cutter formed rotatably by head support
It has a head, and a cutter is in front of the cutter head.
Equipped to be able to cut all cross sections of the face
Gauge cutter that cuts the outer peripheral surface of the tunnel
Is disposed on the front end face of the cutter head, and
Is connected to the spray nozzle, and the spray nozzle is connected.
The gauge cutter to the side.
When cutting the face with the gauge cutter,
At the same time as cutting, the spraying agent is sprayed from the spraying nozzle onto the
Primary lining method of tunnel configured to spray on surface
In the above, the spraying agent is sprayed on a main beam.
An agent supply device and a unit attached to the cutter head.
Hose for spraying agent supply between versal swivel joint
Interposed in the universal swivel joint
Supplied and furthermore the universal swivel joint
The spraying agent in the universal swivel joint is
Connect the hose for feeding to the gauge cutter side,
The hose passes through the frame of the gauge cutter and
Spraying agent protruding toward the cutting surface of the gauge cutter
When the face is cut by the gauge cutter, the blowing agent is sprayed at the same time as the cutting by the gauge cutter so that the spray thickness becomes about 3 mm. To provide a primary lining method for a tunnel for performing primary lining.

[0008]

[Function] When excavating a tunnel with a tunnel boring machine, the spraying agent is installed on the main beam.
It is installed between the spraying agent supply device and the cutter head.
Between the universal swivel joint
From the propellant supply device by means of a propellant supply hose
Sent into the universal swivel joint. Change
Meanwhile, the spraying agent in the universal swivel joint is
After passing through the gauge cutter frame,
Spray nozzle protruding toward the cutting surface of
Connected between the universal swivel joint
The air is supplied to the spray nozzle through a hose. Follow
The supply of the spraying agent is adapted to the rotation of the cutter head.
For spraying smoothly from the universal swivel joint
Will be supplied to the nozzle and cut with a gauge cutter.
When cutting the wing surface, the same as cutting with the gauge cutter
Occasionally, the spray thickness of the spraying agent is about 3 mm.
Then, the primary lining of the tunnel wall is performed.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings. For convenience of explanation, technical matters belonging to the related art will be described at the same time. The figure is a longitudinal sectional side view showing a state where a tunnel 2 is excavated by a tunnel boring machine 1. At the front end of the tunnel boring machine 1, a cutter head 3 is provided with a cutter head support 4.
It is rotatably mounted on. The cutter head 3 is provided with cutters 5, 5... On the front surface thereof to cut the entire cross section of the face 6. Of course, the cutters 5, 5,... Of the appropriate type are selected according to the rock mass to be excavated, but the gauge cutter 5 a for cutting the outer peripheral surface of the tunnel 2 is provided at the front end of the cutter head 3. It is arranged on the outer periphery of the surface. Further, the cutter head support 4 is provided at a front portion of the main beam 7, and a gripper 8 is provided at a rear portion thereof. The gripper 8 is pressed against the hole wall of the tunnel 2 by a hydraulic cylinder to form an anchor. Also, a thrust cylinder 9 pin-connected between the cutter head support 4 and the gripper 8 is interposed, and the thrust cylinder 9 is extended to propel the entire tunnel boring machine 1 while allowing the cutter head support 4 to rotate freely. The cutter head 3 attached to the cutter head 3 is driven to rotate by a motor 10, and the cutters 5, 5,.
And the rock of the face 6 is excavated by the gauge cutter 5a disposed in the periphery thereof.

[0010] The excavated rock waste is deposited on the lower face of the tunnel 2 on the face 6, is scooped up by a bucket 11 provided on the outer peripheral portion of the cutter head 3, and is rearwardly moved by a waste unloading device (not shown). It is carried out to. Also, when one-stroke excavation of the thrust cylinder 9 is completed,
Release the crimping of the gripper 8 to the hole wall, and
The thrust cylinder 9 is contracted to advance the gripper 8 one stroke, and the gripper 8 is again moved to the tunnel 2
The next stroke is excavated by pressing against the hole wall.

A spraying agent supply device 12 is attached to the main beam 7, and
Universal swivel joint 1 attached to
3 and a spraying agent supply hose 14 is interposed therebetween.
The hose 14 passes through the side of the gauge cutter 5a and is connected to a blowing agent spray nozzle 15 protruding toward a cutting surface of the gauge cutter 5a.

As shown in FIG. 2, a cutter hub 17 having a cutter ring 16 fixed at the center thereof is rotatably fitted to a frame 18, and the cutter face 3 is rotated by the rotation of the cutter head 3, as shown in FIG. It is configured to cut rock while rotating. Thus, the hose 14 passes through the inside of the frame 18 and is connected to the nozzle 15, and the nozzle 15 is protruded toward the tip of the cutter ring 16 of the gauge cutter 5a. Thus, the case where the gauge cutter 5a of the cutter head 3 is a disk cutter has been exemplified, but it goes without saying that the present invention is also applicable to other types of cutters.

The spraying agent is used for the primary lining, and a solution type two-component resin or the like is used. For example, it is possible to use a commercially available bituresin-based resin having an epoxy resin as a main component and an amine as a curing agent. Further, the spraying agent supply device 12 may be a compact one composed of a baby compressor, a stock bin, a feed pump, etc.
In the case where the two liquids are mixed and stirred by the spraying agent supply device 12, one is sufficient, but when the main agent of the spraying agent and the curing agent are separately supplied, two bottles are used. Hose 1
4, 14 are used, and are mixed and jetted at the nozzle 15 site. In this way, the inner peripheral surface of the tunnel is firstly lined with the blowing agent at the same time as the tunnel is excavated.

The penetration speed of the tunnel boring machine 1 (the distance that the cutter head 3 excavates during one rotation) varies depending on the geology, the model of the tunnel boring machine 1 and the diameter thereof. １．５1.5 cm / rotation, that is, about 1.8 to 9 cm / min even if it slightly changes depending on the rotation speed of the cutter head 3. The required thickness of the primary lining is such that the wall surface of the tunnel 2 is excavated in a circular shape, and the excavated rock is restrained by blowing the blowing agent before the excavated rock relaxes from the cracked surface. Therefore, it is considered that a sufficient effect can be expected if the thickness of the spraying agent is about 3 mm. Therefore, the capacity of the spraying agent supply device 12 for the primary lining is at most about 2.55 l / min (for a tunnel diameter of 3 m) to 8.5 l / min (for a tunnel diameter of 10 m). Therefore, the spray agent supply device 12 can be formed extremely compact.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0016]

According to the present invention, as described in detail in the above embodiment, when excavating a tunnel using a full-section type tunnel boring machine, a propellant is installed on a main beam.
Installed between the spraying agent supply device and the cutter head
Interposed between the universal swivel joint
Spraying agent supply device by means of a spraying agent supply hose
From the universal swivel joint.
Further, the spraying agent in the universal swivel joint
Passes through the gauge cutter frame and
Spray nozzle protruding toward the cutting surface of the
Connected between the universal swivel joint
Is supplied to the spray nozzle through a hose. Obedience
Thus, the delivery of the spraying agent is adapted to the rotation of the cutter head.
Spraying smoothly from the universal swivel joint
Is supplied to the nozzle for
When cutting the face, cutting with the gauge cutter
At the same time, the spraying thickness of the spraying agent is about 3 mm.
The primary lining of the tunnel wall is applied by spraying. Therefore, after performing this primary lining, reinforcement of the primary lining can be performed behind the facet as necessary, regardless of the excavation, and accordingly, the operation rate and the excavation speed of the tunnel boring machine can be improved. Is greatly improved. In the future, it will be possible to realize unmanned construction by a robot for tunnel excavation in the future.

Furthermore, the primary lining is rock cutting surface is carried out simultaneously with the cutting prior to relaxation, this time, blown
Tunnel the spraying agent so that the spraying thickness of the agent is about 3 mm.
The primary lining is applied by spraying on the wall
However, the strength as the primary lining is
In addition, the material of the spraying agent can be saved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a state where a tunnel is excavated by a tunnel boring machine.

FIG. 2 is a partially cutaway side view showing a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel boring machine 2 Tunnel 3 Cutter head 5a Gauge cutter 6 Face face 12 Spraying agent supply device 14 Hose 15 Nozzle

Claims (1)

(57) [Claims] 1. A tunnel boring machine with a full section is used.
A tunnel excavation method.
Machine with cutter head support at the front end
A cutter head rotatably formed;
-A cutter is installed on the front of the head to completely cut the face
It is configured so that the surface can be cut and
A gauge cutter that cuts the peripheral surface is in front of the cutter head
For spraying the hose for supplying the spraying agent, which is arranged on the end face
Connected to the nozzle, and the spray nozzle is connected to the gauge cutter.
Disposed on the side and cut the face with the gauge cutter
At the same time as the cutting by the gauge cutter,
It is configured so that the spraying agent can be sprayed from the chisel onto the wall of the tunnel
In the primary lining method of the tunnel, the spraying agent is supplied to a spraying agent supply device installed on a main beam.
And a universal attached to the cutter head
Spray agent supply hose interposed between swivel joint
Supplied to the universal swivel joint.
And the universal swivel joint
Spray the spray in the universal swivel joint with the gauge
Connect a hose for feeding to the cutter side,
Passes through the frame of the gauge cutter and
For spraying the propellant projecting toward the cutting surface of the cutter
Become coupled to the nozzle, when cutting the working face surface at the gauge cutter, cutting at the same time as the spraying agent by the gauge cutters, covering primary sprayed with tunnel wall as spraying thickness becomes about 3mm A primary lining method for a tunnel, which is characterized by applying a work.