JP2996096B2 - Large section tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In the case of excavating a tunnel with a large cross section, a drilling machine such as a multiple jumbo drilling machine generally drills a face, mounts a charge and crushes the drill, or inserts a wedge-shaped rock drill into the drilling hole. The rocks are inserted into the rocks, and the generated waste is discharged to the pit side by heavy equipment such as a backhoe for scraping, a shear loader, a dump truck, etc., and then the work of lining the inside of the tunnel with shotcrete is repeated. It is.

[0003]

Therefore, congestion of heavy equipment is inevitable in this type of work, causing work stagnation, and dust is generated by shotcrete.
It causes the working environment to deteriorate.

Accordingly, the present invention has been made in view of the above-mentioned problems, and is capable of performing operations up to drilling of a face face, discharging of excavation debris, and lining with one unit, thereby achieving rapid construction. It is an object of the present invention to provide a large section tunnel excavator that has made it possible.

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

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and provides a large number of drilling machines for drilling a large-section tunnel at a tip thereof, and a mechanism for discharging a shear. A skeleton provided, a segment assembling pedestal arranged on the fuselage in an arch shape along the cross-sectional shape of the tunnel, and a segment installed on the peripheral surface, and pressing the assembled pedestal toward the inner surface of the tunnel A large section tunnel excavator characterized by having a pressing mechanism is provided.

The segments defined in the present invention are:
It also includes a diversion formwork for cast-in-place, and can be removed and cast after casting and solidification of cast-in-place concrete.

[0008]

In the tunnel tunnel machine having a large cross section according to the present invention having the above-described structure, drilling is performed by a drill jumbo provided at the tip of the machine body, and at the same time as the operation of discharging the drilling machine to the rear of the machine body by the machine tool, a segment discharging operation is performed. The lining is performed by installing and fixing the segments installed on the assembly base to the inner surface of the tunnel. According to this segment assembling method, dust is not generated by shotcrete.

[0009]

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

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

The tunnel machine 2 has a frame shape with a substantially convex cross-section corresponding to the arch shape of the upper half of the tunnel 1. A pair of self-propelled crawler belts 3 are provided on the front, rear, left and right sides of the lower surface, respectively. , A plurality of drill jumbo (drilling machine) 5 protrudingly arranged at the tip of the body 4 in multiple stages and multiples, and a scraper scraping device 6 arranged at a lower part of the tip of the body 4. A belt conveyor 7 is provided at a rear portion of the scraping device 6 and has a rear end located at a rear portion of the machine body 4 for discharging a shear.

The upper part of the fuselage 4 is covered with a cover 8 having a cross-sectional shape along the upper arch shape of the tunnel 1. The cover 8 has substantially the same arch-shaped cross-sectional shape as that of one segment. The length of the segment assembly base 9 is set to be movable back and forth.

A plurality of rails 10 are laid on the cover 8 along the front-rear direction, and the wheels 11 provided at the lower part of the assembly base 9 are rolled along the rails 10 so that the assembly base 9 is covered. 8 can be moved back and forth. In addition,
As the moving method, any of a towing method and a self-propelled wheel method can be adopted.

A plurality of pressing means penetrating the cover 8, that is, the lifting hydraulic jack 1
2, the hydraulic jacks 12 abut against the inner surface of the assembling gantry 9 at the forward position thereof, and push up the assembling gantry 9 along the arch shape of the ceiling surface of the tunnel 1.

Further, a drive unit 14, a hydraulic unit 15, a power supply unit 16, a back-filling injection device 17, and the like for moving the drill jumbo 5 forward and backward, laterally moving and drilling are arranged inside the body 4. ing. An injection pipe 18 is connected to the back-filling injection device 17, and the distal end of the injection pipe 18 penetrates the inside and outside of a segment, which will be described later, so as to be able to protrude.

Further, a crane 19 for loading the segments is arranged at the rear of the tunnel machine 2. This crane 19 is a portal crane movable on both sides along a rail 20 laid on the ground in the tunnel 1 on both sides as shown in FIGS. Each segment piece 23a mounted on a transport trolley 22 located at the lower part of a trolley 21, which is formed one step higher and has an arch cross section and can travel along the arched portion 19a, is lifted, and a rear portion on the body 4 is lifted. Is moved to the assembly stand 9 located at the position shown in FIG.

Then, both ends 9a of the assembling base 9 are
As shown in FIG. 4, each of the segment pieces 23 can be extended and contracted via a lift mechanism (not shown) in the order shown from the crane 19 with both ends 9a contracted.
a on the assembling gantry 9 and all the segment pieces 2
When the mounting of 3a is completed, both ends 9a are extended,
Each segment piece 23a is joined in the radial direction and assembled into an integral segment 23.

As shown in FIG. 5, a pin 24 is attached to the end face of each segment piece 23a as a positioning mechanism for joining.
By forming the mortise holes 24a and the tenon holes 24b, the joints 9 are fitted together with each other due to the reduction of the diameters 9a at both ends of the assembling pedestal 9, so that the joining can be performed with high precision.

In order to connect the segment pieces 23a to each other after joining, a bolt box is generally provided on the inner peripheral 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 bolt boxes 25 are joined to each other via bolt nuts to connect the adjacent segment pieces 23a to form the segment 23.

Since the fastening of the bolt and nut is performed at the retracted position of the assembling pedestal 9, it is always performed at a fixed position.
Therefore, if, for example, a segment bolt fastening robot is arranged at the rear part of the body 4, the fastening work can be automatically performed after the mounting work of the segment 23 is completed by driving the robot.

The segment pieces 23a located at both ends of the assembling pedestal 9 among the segment pieces 23a
4A and 4B, the inner piece 23a-2 is fitted to the outer piece 23a-1 so as to be extendable and contractable as shown in FIGS. 6A and 6B.
When the inner piece 23a-1 is pulled out in a state where the inner piece 23a-1 is set on the inner surface of the tunnel and the drawn end lands on the ground, the independence of the segment 23 is obtained, and the segment 23 is supported by the assembly base 9 during the lining work. You don't have to.

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

First, in a state where the fuselage 4 is stopped facing the face 1a, the drill jumbo 5 at the standby position indicated by the imaginary line in FIG. 1 is advanced to a predetermined depth and pattern on the face 1a. Drill with

Next, each drill jumbo 5 is retracted to the standby position, a charge is charged, and the face 1a is excavated by blasting. Next, the excavated scrap generated by the excavation is scraped by the scraping scraping device 6, conveyed to the rear of the machine body 4 through the belt conveyor 7, and transport means such as a not-shown scrap truck or dump truck waiting at the rear end of the conveyor 7. And sequentially discharged to the outside of the mine.

On the other hand, in parallel with the above operation, the segment pieces 23a are sequentially erected through the crane 19 on the assembling stand 9 waiting at the rear position of the body 4, and the segments 23 are assembled at this position.

After completion of the excavation work, the assembly base 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 advance stop position to move the assembly base 9 to the tunnel 1 side. The segment 23 assembled by pressing against the ceiling surface is positioned on the ceiling surface (see FIG. 2). The connection with the segment 23 'following the segment 23 is made via a fastening member such as a bolt.

Next, if the inner piece 23a-2 of the segment piece 23a at both ends is pulled out and its drawn end is fixed on the ground, the segment 23 becomes independent. In this state, the assembling pedestal 9 is moved to the rear standby position again, the backfilling pipe 18 is connected to the segment 23, and the backfilling device 17 is driven to inject the backing material 26 into the ground.
Finish the lining.

After retreating the assembling pedestal 9 or after completing the lining work, the body 4 is advanced by one excavation,
Again, excavation to lining can be performed in the same cycle as described above. The drilling operation on the face face and the subsequent charging operation of the charge can be performed in parallel with the lining operation, the filling operation of the backing material 26, and the like.

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

In each of the above embodiments, the upper half is exclusively used. However, the same mechanism can be applied to limited upper half excavation, lower half excavation, and full-section excavation with an auxiliary bench.

[0031]

As described in detail in the above embodiments, in the large section tunnel excavator according to the present invention, a large number of drilling machines for drilling a large section tunnel are provided at the tip thereof. A fuselage equipped with a shear discharge mechanism, a segment assembly gantry arranged on the fuselage in an arch shape along the cross-sectional shape of the tunnel, and a segment installed on a peripheral surface, and the assembly gantry mounted on the inner surface of the tunnel. Since it is equipped with a pressing mechanism that presses toward the machine, drilling is performed by the drill jumbo provided at the tip of the fuselage, and the
In order to perform lining by installing and fixing the segment built on the segment assembly base to the inner surface of the tunnel,
There is no slippage for each excavation or congestion of heavy equipment for lining,
Rapid construction becomes possible.

Further, according to the present invention, since the segment assembling method is employed, dust is not generated by sprayed concrete, the working environment can be maintained well, and since the assembly is performed mechanically, the safety of work can be ensured. There are advantages such as.

[Brief description of the 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 cross-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 a segment piece on an assembly base.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Large-section tunnel 1a Face face 2 Large-section tunnel excavator 4 Airframe 5 Drill jumbo (drilling machine) 6 Scraping device 7 Belt conveyor 9 Segment assembly stand 12 Hydraulic jack for lifting (pressing mechanism) 23 segment

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/00 E21D 11/40

Claims (1)

(57) [Claims] 1. A machine body provided with a large number of drilling machines for drilling a large-section tunnel at its tip and having a shear discharge mechanism, and an arched shape on the machine body along the cross-sectional shape of the tunnel. A large section tunnel excavator, comprising: a segment assembling gantry that is arranged and installs a segment on a peripheral surface; and a pressing mechanism that presses the assembling gantry toward the inner surface of the tunnel.