JPH02112595A - Execution device for reinforcing tunnel working-face-front bedrock - Google Patents

Abstract

PURPOSE:To reinforce the front bedrock of a working face, and to improve the stability of the working face by penetrating a screw auger mounted to a V travel car body into the bedrock, cutting a slit, injecting concrete and constructing a pre-lining. CONSTITUTION:A plurality of screw augers 16 mounted to an endless zone 14 in front of a V travel car body 2 are penetrated into the front bedrock of a working face, and slits are cut. Concrete is fed into the hollow shafts of the screw augers 16 while pulling the screw augers, and injected and filled into the slits from nose filler holes. A pre-lining composed of a thin concrete arch shell is constructed into the bedrock. The same operation is repeated, and the pre-lining extended in the crossing direction and longitudinal and lateral directions of a tunnel is executed around a tunnel arch section. Accordingly, the settlement of the ground surface due to the excavation of the tunnel can be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reinforcement device for a ground in front of a face, which is applied when excavating a tunnel in an unconsolidated ground with shallow earth breakage.

(Conventional technology) When excavating a tunnel in such ground, the stability of the face is low, so in order to minimize the impact on above-ground structures, that is, ground subsidence, various auxiliary methods are used during construction. There is.

A technique that has been conventionally used as this auxiliary construction method is the forepiling construction method.

In this method, a hydraulic or pneumatic rock drill is used to drill into the face and reinforcing bars, rock bolts, or single pipes are driven into the face, or a small-diameter double drilling device is used to insert hollow rock bolts into the ground. Construction methods such as injection were used.

(Problems to be Solved by the Invention) The conventional construction method described above has no continuity in the cross-direction of the tunnel, so it is not particularly effective on low-adhesive ground.

In addition, for injection type, the permeability of the injection material, construction speed,
There are some drawbacks in terms of safety.

For this reason, the present inventors constructed a thin concrete arch shell that extends continuously in the tunnel transverse and longitudinal directions around the tunnel arch at the face, reinforced the ground in front of the face with the shell, and We proposed a reinforcement method that improves the stability of tunnels and suppresses ground surface subsidence caused by tunnel excavation.

The present invention has been proposed for the purpose of providing a construction device for efficiently carrying out such a reinforcement construction method.

(Means for Solving the Problems) In order to achieve the above object, (1) a guide member that can freely turn in the cross-sectional direction of the tunnel and that can freely move forward and backward on the front of the traveling vehicle body and is supported so that it can be raised and raised; A screw auger support guide member mounted thereon, a hydraulic cylinder for advancing and retracting the support guide member interposed between the support guide member and the screw auger guide member, and a drive mounted at both ends of the support guide member. The screw auger consists of a screw auger moving member with an endless band spanned between a wheel and a driven wheel, and a plurality of screw augers mounted on the endless band of the same moving member and arranged parallel to each other. Each screw auger has a connecting part for a concrete supply pipe at its base end, and a concrete injection port at its tip end.

(Function) Since the present invention is constructed as described above, the guide member is rotated in the cross-sectional direction of the tunnel, raised and lowered, and is positioned at a predetermined position in front of the face by operating the hydraulic cylinder. Using the guide member as a guide, the screw auger is moved forward with respect to the support guide member face, and the screw auger advance/retreat member mounted on the support guide member is driven, and the screw auger is mounted on both front and rear ends of the support guide member. The endless belt is circulated between the suspended driving wheels and driven wheels, and while driving and rotating the plurality of screw augers mounted on the endless belt, each screw auger is penetrated into the ground to create a slit. Cut.

After cutting the slits in this way, pull out the screw augers from the slits in the ground by performing the opposite operation, and insert the concrete supply pipe connected to the base end of each screw auger into the hollow rotating shaft of each screw auger. Concrete is supplied through the slit, and concrete is injected into the slit from the injection port at the tip of the hollow rotating shaft to construct a bra lining made of a thin concrete arch shell in the ground.

Next, the turning member is turned to the next predetermined position, and the same operation as described above is performed to construct the next pre-lining.

Thereafter, the same operations as described above are repeated to construct a pre-lineage made of a thin concrete arch shell that extends continuously in the tunnel transverse direction and longitudinal direction around the tunnel arch.

(Example) The present invention will be described below with reference to the illustrated embodiments.

( ) indicates the crawler that constitutes the running member, (2) indicates the vehicle body mounted on the same crawler (1), and the rotating member (3) is located on the front of the vehicle body (2) in the cross-sectional direction of the tunnel hole (8). It is configured to rotate.

The turning mechanism of the turning member (3), for example, as shown in FIG. (5) (5
), and the toothed rods (5) + 51 are moved up and down as shown by the arrows to rotate the toothed ring (4).

The lower end of the boom (6) is pivotally attached to the upper end of the rotating member (3) so that the boom (6) can rotate freely in the vertical direction.
A first hydraulic cylinder (7) for raising and lowering the boom is connected between the rotary member (3) and the rotating member (3) via a pin.

A guide member (8) is pivotally supported at the upper end of the boom (6) so as to be rotatable in the vertical direction, and a second hydraulic cylinder (for raising and lowering the guide member) is provided between the boom (6) and the guide member (8). 9
) are connected via a pin, and the drilling angle is adjusted by the cylinder (wa) as described below.

A screw auger support guide member (0) is installed on the guide member (8) so as to slide smoothly in the front and back direction, and a drive motor (!) is mounted on the rear and front ends of the support and guide member (0), respectively.
1) Drive wheel 021 and driven wheel θ driven and rotated by
′! J is mounted, and an endless belt (b) is stretched between the same two wheels (02103), and each of the above members (+1102)0
0■ constitutes the screw warger advancing and retracting member described above.

Furthermore, third hydraulic cylinders are interposed between the screw auger support and guide member QO) and the guide member (8), and the third hydraulic cylinders cause the support and guide member 001 to become the guide member (8). It is configured to move forward and backward along the line.

Oθ is a plurality of mutually parallel screw augers mounted on the endless band 04, the base end of which is connected to a drive unit consisting of a screw auger rotation motor 07) and a speed reducer 0■, and a distal end connected to the support It is supported by a steady rest 0 provided on the member Q[D, the driving portion is fixed to the endless band 04), and as the endless band 0 circulates, the screw auger 00 is moved onto the support guide member 01). It is configured to move forward and backward.

Hollow rotating shaft (16a) of the screw auger 06)
The convex end is configured to be connected to a concrete injection pipe via a swivel joint CI provided on the drive section, and a concrete injection port is provided at the tip.

In the illustrated embodiment, there are five screw augers 06).
are arranged in parallel, and the distal ends are connected by a connecting bearing part (21).

Since the illustrated embodiment is configured as described above, the vehicle body (2) is moved to the front face of the face, and the rotating member (3)
swivel to the required position, and turn the first hydraulic cylinder (7
) to tilt the boom (6) at the required angle with respect to the pivot member (3).

Next, the second hydraulic cylinder (9) raises and lowers the guide member (8) relative to the tip of the boom (6) to tilt it at a required angle, determines the drilling angle with respect to the face, and the third Operate the hydraulic cylinder 05) to move the screw auger support guide member On) forward so as to approach the face side.

Next, the screw auger OGI is driven to rotate, and the screw auger advance/retreat member mounted on the screw auger support guide member OI is driven to rotate the drive wheel Q21 and the driven wheel mounted on both ends of the member flf[. 03) Circulating the endless belt 04) between the plurality of screw augers 0 mounted on the endless belt 041
0 into the ground and cut a slit.

When the cutting of the slit is finished, the endless band 04) is moved in the opposite direction and the screw auger 00 is pulled out from the slit, while a concrete supply vehicle is connected to the hollow rotating shaft (16a) of the screw auger Oe at its base end. Concrete is pumped through the concrete pumping pipe (23) from (22), and the concrete (
b) to construct the prelining (C). This prelining (C) is constructed in such a way 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 described above is performed to construct the next pre-lining.

Thereafter, the same operations as described above are repeated to construct a pre-lining made of a thin concrete arch shell that extends continuously in the tunnel transverse and longitudinal directions around the tunnel arch.

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

(Effects of the Invention) According to the construction device for reinforcing another mountain in front of a 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 so as to be movable forward and backward via the hydraulic cylinder. In the screw auger advance/retreat member mounted on the screw auger support guide member, a plurality of concrete strips are parallel to each other and at both ends of the hollow rotating shaft. Since a screw auger with a hollow rotating shaft provided with a supply pipe connection and a concrete injection port was installed, each screw auger cut a slit on the face and the other face, and the screw auger was pulled out into the same slit. At the same time, concrete can be poured and filled to construct a thin bra lining on the ground in front of the face.

The guide member is supported by the vehicle body so as to be able to turn freely in the cross-sectional direction of the tunnel, and to be able to rise and fall freely, so that the guide member can be moved in the cross-sectional direction and longitudinal direction of the tunnel around the tunnel arch by the screw auger. It is possible to construct a prelining consisting of a thin concrete arch shell that extends continuously over the surface direction. As a result, the earth in front of the face is reinforced by the shell,
Subsidence of the ground surface due to tunnel excavation is suppressed.

Furthermore, after cutting a slit in another pile using the screw auger, the slit is immediately filled with concrete, so that the ground release time is short, the displacement of the ground is small, and the effect of suppressing ground subsidence is exhibited.

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

Furthermore, according to the present invention, it is possible to apply bra lining to various tunnel cross sections.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the construction device for reinforcing the ground in front of a tunnel face according to the present invention, FIG. 2 is a plan view of a portion of the screw auger, and FIG.
-III and FIG. 4 are longitudinal sectional side views showing the usage state of the construction device, and FIG. 5 is a front view showing the swing drive device of the swing member. (1) - Crawler (2) - Vehicle body (3) - Swivel member (6) - Boom (71 - - First hydraulic cylinder (8) - Guide member (9) - Second hydraulic cylinder 00 ) - - Screw auger support guide member surface - Drive wheel side - Driven wheel 04 - Endless band θ...Third hydraulic cylinder 0
0-Screw Auger QI-Swivel Joint

Claims (1)

[Claims] A screw warger support guide member mounted on a guide member supported on the front surface of the V-traveling vehicle body so as to be able to freely turn in the cross-sectional direction of the tunnel, and to be able to rise and fall, and to move back and forth; A screw warger is constructed by a screw warger interposed between guide members, a hydraulic cylinder for moving the support guide member forward and backward, and an endless belt spanning between a driving wheel and a driven wheel mounted on both ends of the support guide member. It consists of an advancing/retracting member and a plurality of screw wargers mounted on an endless band of the advancing/retracting member and arranged parallel to each other, and the base end of the hollow rotating shaft of each screw warger is made of concrete. A construction device for reinforcing the ground in front of a tunnel face, characterized in that a connection part of a supply pipe is arranged and a concrete injection port is arranged at the tip part.