JPH0828176A - Large sectional tunnel excavating machine - Google Patents

Abstract

PURPOSE:To improve workability by excavating by a drill jumbo provided on a machine body, discharging debris by a debris mucking device and fixing a segment installed on a segment assembly) frame on the inner surface of a tunnel. CONSTITUTION:A working face surface la is drilled by blasting by retreating a drill 5 after drilling the working face surface 1a by a large number of dill jumbos 5. Thereafter, drilling debris is collected by a debris collecting device 6, transferred to the back of a machine body 4 by a belt conveyor 7 and discharged out of a tunnel by a debris dolly, etc. In parallel with this work, a segment 23 is assembled by installing a segment piece 23a by way of using a crane 19 on an assembly frame 9 in the rear of the machine body 4. After completion of drilling, the segment 23 is positioned at a ceiling surface of a tunnel 1 by advancing the frame 9 and extending a hydraulic jack 12. Additionally, a back-filling material is injected into the foundation after making the segment 23 self-support by fixing both ends of the segment 23 in the foundation and retreating the frame 9. Consequently, it is possible to speedily carry out construction and to secure safety of work prevention of dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large cross-section tunnel excavator capable of performing operations from excavation of face to lining.

[0002]

2. Description of the Related Art Conventionally, when excavating a large cross-section tunnel, a face is generally drilled by a drilling machine such as a multiple jumbo machine, and a charge is crushed to crush it, or a wedge-shaped rock drilling machine is used for the drilling. Inserting the rocks and breaking them, the generated scraps are discharged to the mine side by heavy equipment such as back shovel for scraping, scraping machine, dump truck, and then the inner surface of the tunnel is lined with sprayed concrete. Be done.

[0003]

Therefore, in this type of work, congestion of heavy machinery is unavoidable, which causes work stagnation, and dust is generated by the shotcrete,
This will cause the work environment to deteriorate.

Therefore, the present invention has been made in view of the above problems, and enables a single machine to perform work such as drilling of a face, discharging of a drilling scrap and lining, thereby enabling rapid construction. It is an object of the present invention to provide a large-section tunnel excavator that enables

Another object of the present invention is to prevent dust from being generated during lining, thereby preventing deterioration of working environment.

[0006]

The present invention has been made in order to achieve the above object, and is provided with a large number of boring machines for boring a large-section tunnel at the tip thereof, and is provided with a slip discharge mechanism. A body provided with the frame, a segment assembly mount arranged on the fuselage in an arch shape according to the sectional shape of the tunnel, and a segment installed on the peripheral surface, and the assembly mount is pressed toward the inner surface of the tunnel. The gist is a large-section tunnel excavator, which is equipped with a pressing mechanism.

The segment defined in the present invention is
It also includes a conversion form for cast-in-place, and it is also possible to remove cast-in-place concrete after it has been poured and solidified, and then converted.

[0008]

In the large cross-section tunnel excavator of the present invention having the above-described structure, the drill jumbo provided at the tip of the machine body is used to perform drilling, and the chip discharge mechanism discharges the excavation chip to the rear of the machine body at the same time. The lining is performed by installing and fixing the segment installed on the assembly stand on the inner surface of the tunnel. This segment assembly method does not generate dust due to shotcrete.

[0009]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 5 show a first embodiment of the present invention, FIG. 1 is a vertical sectional view of a tunnel machine according to the present invention, and FIG. 2 is a horizontal sectional view thereof.

In FIGS. 1 and 2, 1 is excavated in a ground E having relatively good ground such as medium-hard rock to hard rock with an elliptical deformed circular cross-sectional shape (for example, width 20 m, cross-sectional area). 230m
(Up to ² ) is a large section tunnel, and the upper half of the face 1a of the tunnel 1 is excavated by the large section tunnel excavator 2 according to the present invention.

The tunnel excavator 2 has a frame shape framed in a substantially convex cross-section corresponding to the arch shape of the upper half of the tunnel 1, and has a pair of caterpillars 3 for self-propelling on the lower, front, rear, left and right sides. A machine body 4 provided with, a large number of drill jumbo (drilling machine) 5 arranged in a projecting manner at the tip of the machine body 4 in multiple stages, and a scraping scraping device 6 arranged at the lower end of the tip of the machine body 4, It is provided with a belt conveyer 7 that is connected to the rear part of the scraping device 6 and has its rear end located at the rear part of the machine body 4 for discharging slip.

The upper portion of the machine body 4 is covered with a cover 8 having a cross-sectional shape that follows the upper arch shape of the tunnel 1. On this cover 8, there is substantially the same arch-shaped cross section and one segment. The segment assembly frame 9 having the length of is arranged so as to be movable back and forth.

Further, a plurality of rails 10 are laid along the front-rear direction on the cover 8, and the wheels 11 provided at the lower part of the assembly rack 9 are rolled along the rails 10 to cover the assembly rack 9. It is possible to move back and forth on the 8th. In addition,
Either a towing system or a self-propelled wheel system can be adopted as this moving system.

A plurality of pressing means for penetrating the cover 8, that is, a hydraulic jack 1 for lifting and lowering is provided on the upper end of the body 4.
2 are arranged, and these hydraulic jacks 12 abut on the inner surface of the assembly base 9 in the forward position of the assembly base 9 to push the assembly base 9 up along the arch shape of the ceiling surface of the tunnel 1.

Further, inside the machine body 4, a drive unit 14, a hydraulic unit 15, a power supply equipment 16, a backfilling injection device 17, etc. for moving the drill jumbo 5 forward and backward, moving laterally and rotating a hole are arranged. ing. An injection pipe 18 is connected to the back-filling injection device 17, and the tip of the injection pipe 18 penetrates the inside and outside of a segment described later to allow protruding piping.

Furthermore, a crane 19 for loading a segment is arranged at the rear part of the tunnel machine 2. As shown in FIGS. 1 and 3, this crane 19 is a portal crane that is movable on both sides along a rail 20 laid on the ground in the tunnel 1, and the upper side of the crane 19 is from the assembling platform 9. The height of each segment piece 23a mounted on a carriage 22 located below the trolley 21 which is formed one step higher and has an arched cross section and can run along the arched portion 19a. It is to be relocated to the assembly frame 9 located at.

Both ends 9a of the assembly frame 9 are
As shown in FIG. 4, each segment piece 23 can be expanded and contracted via a lift mechanism (not shown) in the order shown from to to 19 with the crane 9 in a contracted state.
a is erected on the assembling base 9, and all the segment pieces 2
If the mounting of 3a is completed, extend both ends 9a,
The segment pieces 23a are joined in the radial direction and assembled into an integral segment 23.

As a positioning mechanism for joining, as shown in FIG. 5, a pin 24 is provided on the end surface of each segment piece 23a.
By forming a and the mortise hole 24b in advance, the assembling base 9 can be joined with each other while being fitted to each other due to the reduction of 9a at both ends, so that the joining can be performed with high accuracy.

Further, in order to connect the segment pieces 23a to each other after joining, a bolt box is generally provided on the inner peripheral surface side of the segment piece. In this embodiment, as shown in FIG. 25 is formed on the outer peripheral side of the segment piece 23a, and the segment boxes 23 are formed by connecting the adjacent segment pieces 23a by joining the bolt boxes 25 with each other via a bolt nut.

Since the fastening of the bolts and nuts is a work at the retracted position of the assembly frame 9, it is always a fixed position work.
Therefore, for example, if a segment bolt fastening robot is arranged at the rear portion of the machine body 4, the fastening work can be automatically performed by the drive of the segment bolt fastening robot after the mounting work of the segment 23 is completed.

Of the segment pieces 23a, the segment pieces 23a located at both ends of the assembly frame 9 are to be positioned.
As shown in FIGS. 6A and 6B, (in FIG. 4), the inner piece 23a-2 is stretchably fitted to the outer piece 23a-1.
When the inner piece 23a-1 is pulled out in the state of being set up on the inner surface of the tunnel and the end of the inner piece 23a-1 is landed on the ground, the segment 23 becomes self-supporting and is supported by the assembly stand 9 during the lining work. You don't have to.

Next, the procedure from the excavation of the face to the lining by the tunnel machine 2 will be described.

First, in a state in which the machine body 4 is opposed to the face face 1a and stopped, the drill jumbo 5 at the standby position shown by an imaginary line in FIG. 1 is advanced to make a predetermined depth and pattern on the face face 1a. Drill with.

Next, each drill jumbo 5 is retracted to the standby position, the charge is loaded, and the facet 1a is blasted for digging. Then, the excavation scrap caused by excavation is scraped by the scrap scraping device 6, conveyed to the rear of the machine body 4 through the belt conveyor 7, and is a transportation means such as a scrap carrier or a dump truck which is not shown in the figure and stands by at the rear end of the conveyor 7. It will be delivered to the mine and discharged through the mine.

On the other hand, in parallel with the above work, the segment pieces 23a are sequentially erected on the assembly stand 9 standing by at the rear position of the machine body 4 through the crane 19 and the segment 23 is assembled at this position.

After the completion of the excavation work, the assembly frame 9 holding the segment 23 is advanced to the face 1a side, and the hydraulic jacks 12 are simultaneously driven to the extension side at the forward stop position to move the assembly frame 9 to the tunnel 1. The segment 23 assembled by being pressed against the ceiling surface is positioned on the ceiling surface (see FIG. 2). The connection with the segment 23 'subsequent to the segment 23 is made through a fastening member such as a bolt.

Then, the inner pieces 23a-2 of the segment pieces 23a at both ends are pulled out, and the pulled out ends are fixed on the ground, so that the segments 23 become self-supporting. In this state, the assembly base 9 is moved to the rear standby position again, the backfill injection pipe 18 is connected to the segment 23, and the backfill injection device 17 is driven to inject the backfill material 26 into the ground.
Finish the lining.

After the assembly frame 9 is retracted or after the lining work is completed, the machine body 4 is moved forward by one excavation,
Again, excavation and lining can be performed in the same cycle as described above. The drilling work on the face face and the subsequent loading of the charge can be performed concurrently with the lining work, the filling work of the backing material 26, and the like.

In this embodiment, the segment 2 is used for lining.
Although 3 was used, a diversion formwork for cast-in-place may be used instead. In this case, the formwork can be removed and diverted after pouring and solidification of cast-in-place concrete.

In each of the above embodiments, the upper half is exclusively used, but the same mechanism is also applicable to limited upper half excavation, lower half excavation, and full-section excavation with an auxiliary bench.

[0031]

As described above in detail with reference to the embodiments, in the large cross-section tunnel excavator according to the present invention, a large number of boring machines for boring a large cross-section tunnel are provided at the tip, A machine body provided with a slip discharge mechanism, a segment assembly frame arranged on the machine body in an arch shape along the cross-sectional shape of the tunnel, and installing a segment on the peripheral surface, and the assembly frame on the inner surface of the tunnel. Since it is equipped with a pressing mechanism that presses toward, the drill jumbo provided at the tip of the machine makes a hole, and the slide discharging mechanism discharges the drilling scrap to the rear of the machine at the same time.
In order to perform lining by installing and fixing the segment installed on the segment assembly stand on the inner surface of the tunnel,
There is no slipping at each excavation and congestion of heavy equipment for lining,
Rapid construction is possible.

Further, in the present invention, since the segment assembly system is adopted, dust is not generated by the shotcrete, the working environment can be maintained well, and the mechanical assembly allows the safety of the work to be secured. There are advantages such as.

[Brief description of drawings]

FIG. 1 is a side sectional view of a large section tunnel excavator according to a first embodiment of the present invention.

FIG. 2 is a transverse sectional view of the same.

FIG. 3 is a front view of a segment loading crane.

FIG. 4 is an explanatory view showing a procedure for installing the segment pieces on the assembly stand.

FIG. 5 is a partial perspective view of a segment piece.

FIG. 6A is a cross-sectional view of segment pieces located at both ends of the segment. (B) is a sectional view taken along line BB of (a).

[Explanation of symbols]

 1 Large Section Tunnel 1a Face Face 2 Large Section Tunnel Excavator 4 Body 5 Drill Jumbo (Drilling Machine) 6 Scraping Device 7 Belt Conveyor 9 Segment Assembly Stand 12 Hydraulic Jack for Lifting (Pressing Mechanism) 23 Segment

Claims (1)

[Claims] 1. A large number of boring machines for boring a large-section tunnel are provided at the tip, and a machine body provided with a slip discharge mechanism is formed on the machine body so as to form an arch shape along the cross-sectional shape of the tunnel. A large cross-section tunnel excavator, comprising: a segment assembly frame that is arranged and that installs segments on the peripheral surface; and a pressing mechanism that presses the assembly frame toward the inner surface of the tunnel.