JP2594468B2 - Construction equipment for reinforcement of ground in front of tunnel face - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reinforcing device for a ground in front of a face, which is applied when a tunnel is excavated in an unconsolidated ground with a shallow earth cover or the like.

(Conventional technology) When excavating a tunnel in such a mountain, the stability of the face is low, so it is necessary to use various auxiliary construction methods to minimize the influence on the ground structure, that is, the surface subsidence. I have.

In the technology that has been used as this reinforcement method,
There is a floor piling method.

In this method, a hydraulic or pneumatic rock drill pierces the face, drives in reinforcing steel, rock bolts, or a single pipe, or inserts a hollow rock bolt using a small-diameter double drilling machine to inject the ground. Method was adopted.

(Problems to be Solved by the Invention) In the above-mentioned conventional construction method, there is no continuity in the cross direction of the tunnel.

Also, the injection type has drawbacks in terms of ground permeability of the injection material, construction speed, and safety.

For this reason, the present inventors constructed a thin concrete arch shell continuously extending in the transverse direction and the longitudinal direction of the tunnel in the vicinity of the arch portion of the tunnel, and reinforced the ground in front of the face with the shell. Proposed a reinforcement method that improves the stability of the ground and suppresses the settlement of the ground surface due to tunnel excavation.

The present invention has been proposed for the purpose of providing a construction apparatus for efficiently performing such a reinforcing method.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a guide member supported on the front surface of a V-vehicle body, which is rotatable in the cross-sectional direction of the tunnel, and which can be raised and lowered and raised and lowered, is movable forward and backward. A screw auger supporting and guiding member, a screw auger interposed between the supporting and guiding member and the guiding member are mounted on both ends of a hydraulic cylinder for moving the supporting and guiding member forward and backward, and both ends of the supporting and guiding member. A screw auger advancing / retracting member having an endless belt spanned between a driving wheel and a driven wheel, and a plurality of screw augers mounted on the endless band of the advancing / retracting member and arranged in parallel with each other. Each of the screw augers is provided with a concrete feed pipe connecting portion at the base end of the hollow rotary shaft and a concrete inlet at the tip end.

(Operation) Since the present invention is configured as described above, the guide member is pivoted in the tunnel cross-sectional direction, and is moved up and down and undulated, and the hydraulic cylinder is operated to be positioned at a predetermined position on the front face of the face. Using the guide member as a guide, the screw auger is supported.The guide member is advanced with respect to the face,
The screw auger advancing / retreating member mounted on the support guide member is driven to circulate the endless belt between the drive wheel and the driven wheel mounted on the front and rear ends of the support guide member, and the endless belt is moved. While driving and rotating the plurality of screw augers mounted on the vehicle, the respective screw augers penetrate the ground and cut slits.

After cutting the slit in this way, pull out the screw auger from the slit of the ground by the reverse operation from the previous, and on the hollow rotating shaft of each screw auger,
Concrete is supplied through a concrete supply pipe connected to the base end, concrete is injected and filled into the slit from the injection port at the tip of the hollow rotary shaft, and a prelining made of a thin concrete arch shell is formed in the ground. To build.

Next, the turning member is turned to the next predetermined position, and the same operation as above is performed to construct the next prelining.

Hereinafter, by repeating the same operation as described above, a prelining made of a thin concrete arch shell continuously extending in the tunnel transverse direction and the longitudinal direction is constructed around the tunnel arch portion.

(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

(1) is a crawler constituting a traveling member, (2) is a vehicle body mounted on the crawler (1), and a turning member (3) is provided on a front surface of the vehicle body (2) in a cross-sectional direction of a tunnel hole (A). It is configured to turn.

The turning mechanism of the turning member (3) is, for example, as shown in FIG. 4, a pair of right and left tooth sticks meshing with a tooth wheel (4) fixed to a rotating shaft (3a) of the turning member (3). (5)
(5 ') is provided, and the tooth sticks (5) and (5') are moved up and down as shown by arrows to rotate the tooth wheel (4).

A lower end portion of the boom (6) is pivotally attached to an upper end of the turning member (3) so that the boom (6) can rotate vertically, and a boom raising / lowering member is provided between the boom (6) and the turning member (3). The first hydraulic cylinder (7) is connected via a pin.

A guide member (8) is pivotally supported on the upper end of the boom (6) in a vertically rotatable manner, and a second hydraulic cylinder (8) for raising and lowering the guide member is provided between the boom (6) and the guide member (8). 9) is connected via a pin, and the drilling angle is adjusted by the cylinder (9) as described later.

A screw auger support guide member (10) is mounted on the guide member (8) in a slidable manner in the front-rear direction, and a drive motor (11) is provided at the rear end and the front end of the support guide member (10). ), A driven wheel (13) and a driven wheel (13) are mounted, and an endless band (14) is bridged between the two wheels (12) and (13). ) (12) (1
3) (14) constitutes the screw auger advance / retreat member described above.

Further, a third hydraulic cylinder (15) is interposed between the screw auger support guide member (10) and the guide member (8), and the support guide member (10) is moved by the hydraulic cylinder (15). It is configured to move forward and backward along the guide member (8).

(16) is a plurality of parallel screw augers mounted on the endless belt (14), the base end of which is connected to a drive unit including a screw auger rotating motor (17) and a speed reducer (18). Connected, the distal end is supported by a steady rest (19) disposed on the support member (10), and the drive unit is fixed to the endless band (14), and the endless band (14) is circulated along with the circulation of the endless band (14). The screw auger (16) is configured to advance and retreat on the support guide member (10).

The hollow rotating shaft (16a) of the screw auger (16)
Is connected to a concrete pouring pipe via a swivel joint (20) provided in the driving section, and a concrete pouring port is provided at a distal end thereof.

In the illustrated embodiment, five screw augers (1
6) are arranged in parallel, and the distal ends are connected by a connecting bearing (21).

Since the illustrated embodiment is configured as described above,
The vehicle body (2) is moved to the front face of the face, the revolving member (3) is revolved to a required position, and the boom (6) is rotated at a required angle with respect to the revolving member (3) by the first hydraulic cylinder (7). To tilt.

Next, the guide member (8) is raised and lowered with respect to the tip of the boom (6) by the second hydraulic cylinder (9) to be inclined at a required angle, thereby determining the drilling angle with respect to the cutting edge ground and the third hydraulic cylinder. Operate the hydraulic cylinder (15)
The screw auger support guide member (10) is advanced so as to approach the face side.

Next, the screw auger (16) is driven and rotated, and the screw auger advancing / retreating member mounted on the screw auger support guide member (10) is driven to be mounted on both ends of the member (10). The endless belt (14) is circulated between the driving wheel (12) and the driven wheel (13), and the plurality of screw augers (16) mounted on the endless belt (14) are grounded. Penetrate and cut slit.

When the cutting of the slit is completed, the endless belt (14) is moved in the opposite direction to pull out the screw auger (16) from the slit, and the base end of the screw auger (16) is inserted into the hollow rotating shaft (16a) of the screw auger (16). Concrete is pumped through a concrete pumping pipe (23) from a concrete feeder (22) connected to the concrete, and concrete (b) is fed into the slit (a) from the tip inlet of the hollow rotary shaft (16a). To construct the prelining (c). This prelining (c) is constructed such that its rear end overlaps the front end of the existing prelining.
(See FIG. 5) Next, the turning member (3) is turned to the next predetermined position, and the same operation as above is performed to construct the next prelining.

Hereinafter, the same operation is repeated, and a pre-lining made of a thin concrete arch shell extending continuously in the transverse direction and the longitudinal direction of the tunnel is constructed around the tunnel arch portion.

In the figure, (24) is a concrete mixer truck, (d) is a steel support, and (e) is shotcrete.

(Effects of the Invention) According to the construction device for reinforcing the ground in front of the tunnel face according to the present invention, as described above, it is mounted on the guide member supported on the front surface of the traveling vehicle body via the hydraulic cylinder so as to be movable forward and backward. In the screw auger advancing and retreating member mounted on the screw auger support and guide member, the endless belt bridged between the front and rear drive wheels and the driven wheels, a plurality of mutually parallel and at both ends of the hollow rotary shaft. Since a screw auger with a hollow rotary shaft provided with a concrete supply pipe connection and a concrete injection port was mounted, the slits were cut on the cutting ground by each of the screw augers,
Concrete can be injected and filled into the slit at the same time as each screw auger is pulled out, so that a thin prelining can be constructed on the ground in front of the face.

Thus, the guide member is supported by the vehicle body so as to be pivotable in the tunnel cross-sectional direction and to be able to move up and down and up and down, so that the screw auger extends in the cross-sectional direction of the tunnel around the tunnel arch. It is possible to construct a prelining made of a thin concrete arch shell extending continuously in the longitudinal section direction.
As a result, the ground in front of the face is reinforced by the shell, and subsidence of the ground surface due to tunnel excavation is suppressed.

In addition, immediately after the slit is cut into the ground by the screw auger, the slit is immediately filled with concrete, so that the ground release time is short, the ground is less displaced, and the effect of suppressing surface subsidence is exhibited.

Furthermore, according to the present invention, it is possible to drill holes with various slit widths only by replacing the screw auger.

Furthermore, according to the present invention, it is possible to adapt to prelining work of various tunnel cross sections.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a construction device for reinforcing a ground in front of a tunnel face according to the present invention, FIG. 2 is a plan view of a screw auger portion thereof, and FIG. III-II
I and FIG. 4 are longitudinal side views showing a use state of the construction device, and FIG. 5 is a front view showing a turning drive device of the turning member. (1) Crawler (2) Body (3) Revolving member (6) Boom (7) First hydraulic cylinder (8) Guide member (9) Second Hydraulic cylinder No. 2 (10) Screw auger support guide member (12) Drive wheel (13) Driven wheel (14) Endless belt (15) Third hydraulic cylinder (16 ) ... Skrillu Auger (20) ... Swiveljoint

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hirokazu Kami, Inventor Hirokazu 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Industries Co., Ltd. (72) Inventor Yoichi Mimura 4-6-115 Sendagaya, Shibuya-ku, Tokyo Fujita Inside Industrial Co., Ltd. (72) Inventor Mamoru Hamano 2-4-9, Nihonbashi Kayabacho, Chuo-ku, Tokyo Sanwa Kiki Co., Ltd. (56) References JP-A-2-240396 (JP, A) JP-A-60-19897 (JP, A) JP-A-61-117398 (JP, A)

Claims (1)

(57) [Claims] 1. A screw auger support guide member mounted on a guide member supported on a front surface of a V-vehicle body, which is rotatable in the cross-sectional direction of a tunnel, and which can move up and down and up and down. A support guide member and a screw auger interposed between the guide members are passed over an endless belt between a hydraulic cylinder for moving the support guide member forward and backward, and a drive wheel and a driven wheel mounted on both ends of the support guide member. And a plurality of screw augers mounted on an endless belt of the screw auger and disposed in parallel with each other. A construction device for reinforcing ground in front of a tunnel face, wherein a connection portion of a concrete supply pipe is provided at an end portion, and a concrete injection port is provided at a tip portion.