JPH0336393A - Tunnel excavator - Google Patents

Abstract

PURPOSE:To enhance the efficiency of excavating a tunnel by laying three pairs of rails rearwardly of a segment assembling machine, and transferring segment on the center rail and placing gate-shaped drilling machines on both side rails, and radially drilling a small diameter hole. CONSTITUTION:Three pairs of rails 9a, 9b, 9c are laid rearwardly of an excavator 1 having a segment assembling machine 2 mounted thereto, and a drilling and circulating unit and a hydraulic unit are mounted to each rail and also a segment carrier is placed on the center rail 9c. A small bore drilling machine 13 in the form of a gate having a space that allows the segment carrier to pass therethrough is moveably placed on the rails 9a, 9b. A radial small diameter hole for foundation improvement is drilled simultaneously with excavation of a tunnel. Thus, excavation work is efficiently carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tunnel excavation device used for forming deep underground spaces.

[Conventional technology]

2. Description of the Related Art Tunnel excavators that excavate underground while rotating a rotary cutter with a cutter attached to the front surface have been well known.

[Three problems to be solved by the invention] When excavating a deep underground space, as shown in Figs. A tunnel d is excavated in a spiral shape, and around this tunnel d, glass fiber and grout are sequentially injected in a radial direction from the inner surface of the tunnel d, and a large number of reinforcing arms e are created to form this ground reinforcement part f. ,after that,
The inside of this ground reinforcement part f is excavated to form a cavity g.

In conventional tunnel excavation equipment, the formation of reinforcing arms on the inner surface of the tunnel was performed separately from the tunnel excavation work, resulting in poor work efficiency.

The present invention has been developed in consideration of the above-mentioned problems, so that tunnel excavation, segment assembly on the tunnel inner surface, and drilling of reinforcing arm holes on the tunnel inner surface can be carried out in parallel and continuously, eliminating loss time. The object of the present invention is to provide a tunnel excavation device that can improve the efficiency of excavation and shorten the construction period.

[Means to solve the problem]

To achieve the above object, a tunnel excavation device according to the present invention includes a tunnel excavation machine equipped with a segment assembly machine at the rear, a plurality of pairs of rails laid behind the tunnel excavation machine, a mud water circulation unit, and a tunnel excavation machine equipped with a segment assembly machine at the rear. a trailing cart equipped with a hydraulic unit and mounted on the rail so as to be towable;
In addition, there is a segment transport vehicle for transporting segments on other rails, and a space for the segment transport vehicle to pass behind the following vehicle, which is arranged so as to be movable in the axial direction of the tunnel, and is arranged radially on the inner surface of the tunnel. It consists of a small-diameter drilling machine that drills small-diameter holes.

[Operation] A tunnel is excavated by a tunnel excavating machine, and then segments are assembled and pasted on the inner surface of the tunnel by a segment assembling machine. The excavated earth and sand are processed by a mud water circulation unit on the following truck, and the hydraulic power for the tunnel excavation machine and segment assembly machine is supplied from the hydraulic unit on the following truck. A radial small-diameter hole is bored on the tunnel inner surface using a small-diameter drilling machine. The segment transport vehicle reciprocates between the starting shaft and the segment assembly machine without being obstructed by the small-diameter drilling machine.

〔Example〕

Embodiments of the present invention will be explained with reference to FIGS. 1 to 4.

In the figure, 1 is a tunnel excavator, and 2 is a segment assembly machine installed at the rear of the tunnel excavator 1. The tunnel excavation machine 1 is a normal tunnel excavation machine, for example, a cutter 3 on the front side.
Excavating by rotating the rotary cutter 4 equipped with
This excavated earth and sand is transported to the rear as muddy water. In addition, a plurality of steering jacks (not shown) are interposed in the circumferential direction between the front and rear cylinders 5 and 6, and by selectively extending and contracting the steering jacks, the rear cylinders are The steering operation is performed by swinging the cylindrical body 5 on the front side with respect to the body 6. Further, a reaction force jack 1a is provided at the rear end of the rear cylinder 6 so as to face rearward.

The segment assembly machine 2 is also commonly used, and is used to assemble steel segments 8 transported from the rear of the tunnel 7.
are sequentially assembled on the inner surface of the tunnel.
Inside the tunnel 7 of this segment 8, there are three pairs of rails 9a extending rearward from the rear side of the segment assembly 112.
9b.

9C is laid in parallel. Each set of rails 9a, 9
b and 9c follow the excavation of the tunnel excavator 1 and extend sequentially. Of these three pairs of rails 9a, 9b, and 9c, a mud water circulation unit 10 is installed on one rail 9a on both the left and right sides.
However, on the other rail 9b, there are mounted subsequent carts 12a and 12b, each of which is to be demolished and has a hydraulic unit 11 mounted thereon. Furthermore, a self-propelled segment transport vehicle 12e carrying the segments 8 is placed on the central rail 9C.

Reference numeral 13 denotes a small-diameter drilling machine, and the main body frame 14 of this small-diameter drilling machine 13 is formed in a gate shape. 15b is erected and fixed. Drilling machines 17 and 17 are rotatably mounted at the center of the beam part 16 of the main body frame 14 and on both sides of the beam part 16 in the front and rear directions. Each of the drilling machines 17 includes a first arm 19 rotatably mounted on the beam 16 by a motor 18, and a W rotatably mounted on the tip of one of the first arms so as to be rotatable by a motor 20.
32 arm 21, an extensible member 22 attached to the distal end of the second arm 21 so as to be extendable and retractable using a cylinder device, a cover 23 attached to this extensible member 22, and a third arm that penetrates through this cover 23 and 2 Sliding support member 2 on arm 21
The jet nozzle 26 is comprised of a flexible high-pressure pipe 25 that is slidably supported via a pipe 4 and a jet nozzle 26 attached to the tip of the high-pressure pipe 25.

The rotation fulcrum 26 at the base end of the second arm 21 moves on the rotation trajectory of the first arm 19, and the rotation trajectory at this time passes through the center of the tunnel 7. It has been determined.

The cover 23 has a shape that follows the inner surface of the segment 8 of the tunnel 7, and a borehole discharge hose 27 is connected thereto.

The jet nozzle 26 has a main nozzle 26a at its tip.
However, a sub nozzle 26b is provided on the rear side. 28 is a water jet pump.

In the above configuration, the tunnel excavator 1 excavates the tunnel 7.
is excavated, and the excavated soil is transferred to mud water circulation unit 1.
At 0, the water turns into muddy water and is discharged to the rear through a discharge hose (not shown). Then, the segments 8 are assembled and pasted onto the inner surface of the tunnel 7 by the segment assembly machine 2.

Each hydraulic operating section of the segment assembly machine 2 and the tunnel excavating machine 1 is operated by hydraulic pressure from a hydraulic unit 11. At this time, the backside of the segment 8 is filled with a backfilling material 29.

Muddy water 1 above! The ring unit 10 and the hydraulic unit 11 are towed and moved forward as the tunnel excavator 1 excavates.

Further, the segments 8 assembled on the inner surface of the tunnel by the segment assembling machine 2 are successively pushed into the segment carrier 12c running on the central rail 9c. At this time, by rotating the first arm of the drilling machine 17 of the small-diameter drilling machine 13 upward, it will not interfere with the traveling of the self-propelled cart 12c.

The tunnel excavator 1 is moved forward by pushing the segment 8 with the reaction force jack 1a.

Next, the operation of drilling a small diameter hole in the inner wall surface of the tunnel which has been excavated as described above and has the segments 8 affixed to the inner peripheral surface will be explained.

First, the 'm1 arm 19 is rotated to position the pivot point 26 of the second arm 21 at the center of the tunnel 7. Then the second
While pointing the arm 21 in the same direction as the hole to be drilled, the expandable member 22 is extended to attach the cover 23 to the inner surface of the tunnel.

Next, the tip of the jet nozzle 26 is made to face the inner surface of the tunnel 7, and a high-pressure water jet is supplied from the water jet pump 28 through the high-pressure pipe 25. As a result, a main jet stream is injected from the main nozzle 26a at the tip of the jet nozzle 26, and a sub-jet stream is injected from the sub-nozzle 26b at the rear end, and the main jet stream perforates a small-diameter hole in the inner surface of the tunnel wall. . At this time, the auxiliary jet stream applies a propulsive force to the jet nozzle 26, and the jet nozzle 26 performs a drilling operation with its own blade and discharges the turning powder. At this time, the waste flour and jet liquid are discharged from the cover 23 through the hole 27.

In the above-mentioned drilling operation, drilling may be performed directly from the segment 8, but if a hole is made in the segment 8 in advance,
A hole may be drilled into the rock on the inner surface of the tunnel through this hole.

? Figure 84 shows the other side of the small-diameter drilling machine 13, in which the jet nozzle 26' of the drilling operation 17' is provided with a nozzle 26a' only at the tip, and the high-pressure pipe 25 is provided on the second arm 21. It is designed to be sent by a piping feed device 31.

〔Effect of the invention〕

According to the present invention, tunnel excavation, segment assembly on the inner surface of the tunnel, and drilling of holes for supporting arms on the inner surface of the tunnel can be carried out in parallel and continuously, eliminating loss time, improving the efficiency of tunnel excavation, It is possible to shorten the construction period.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view showing the overall configuration, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. Fig. 4 is a front view showing the other side of the small-diameter drilling machine, and Figs. 5 and 6 are explanatory diagrams showing an example of a method for excavating a deep underground cavity. be. 1 is a tunnel excavator, 2 is a segment assembly machine, 7 is a tunnel, 8 is a segment, 9a, 9b. 9C is a rail, 10 is a mud water circulation unit, 11 is a hydraulic unit, 12a and 12b are trailing carts, 12c is a segment conveying cart, and 13 is a small diameter drilling machine.

Claims (1)

[Claims] Tunnel excavator 1 with segment assembly machine 2 attached to the rear
A plurality of pairs of rails 9a, 9b, 9c are laid behind the tunnel excavator 1, and trailing carts 12a, 12b are mounted with a mud water circulation unit 10 and a hydraulic unit 11, and are mounted on the rails so as to be towable. and a segment transport vehicle 12c that transports the segment 8 on another rail, and a space for the segment transport vehicle 12c to pass behind the following vehicles 12a and 12b, and moves in the axial direction of the tunnel 7. Possibly located, tunnel 7
Small-diameter drilling machine 13 for drilling small-diameter radial holes on the inner surface
A tunnel excavation device comprising: