JPS61216998A - Concrete spraying method of wall surface of tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously spraying concrete for wall protection onto an arch-shaped tunnel wall.

Conventionally, as a method for spraying concrete on tunnel walls, as disclosed in Japanese Patent Application Laid-open No. 54-3347, a turning platform that is rotated by a hydraulic motor for turning is mounted on a base equipped with a traveling device. The base end of the M1 boom, which is lifted up and down by a hydraulic cylinder, is pivotally attached to the turning table, and the base end of the second boom, which is lifted up and down by a hydraulic cylinder, is pivoted to the tip of the first boom. A sixth boom, which is extended and retracted by a hydraulic cylinder, is slidably fitted into the second boom, and a block which is lifted up and down by a hydraulic cylinder is pivotally attached to the tip of the third boom. The guide bar mechanism is equipped with a guide bar mechanism that is rotated by an actuator, and the guide bar mechanism is connected to an outer cylinder with a slit that is rotated by a swinging actuator via a gear mechanism, and a hydraulic pressure for moving back and forth that is arranged inside the outer cylinder. Consisting of a threaded rod that is rotated many times by a motor, and a nozzle holder that is screwed onto the threaded rod and inserted into a slit in the outer cylinder, with the block stopped at a certain position, Operating the swinging actuator and the hydraulic motor for forward and backward movement to move the concrete spraying nozzle supported by the nozzle holder forward in a zigzag pattern in the longitudinal direction of the tunnel, and after the nozzle has moved forward to a predetermined position, The guide/guide bar mechanism is moved in the circumferential direction of the tunnel wall by manual operation, and then the swing actuator and the hydraulic motor for forward and backward movement are operated again to move the nosuruwo backward in a zigzag shape in the longitudinal direction of the tunnel, and the following steps are performed. A method is known in which concrete is sprayed all around the tunnel wall by repeating similar operations.

However, in the case of the conventional spraying method, the manually controlled guide bar mechanism must be moved parallel to the circumferential direction of the tunnel each time the automatic operation of the nozzle completes the zigzag movement in the longitudinal direction of the tunnel. Automatic operation cannot be performed all around the wall surface, and complicated driving operations are required. Furthermore, when spraying concrete onto a tunnel wall, the nozzle must be moved at a constant speed along the wall in order to spray with a uniform thickness. When the nozzle is moved by , it is difficult to move the nozzle at a constant speed over the entire movement range, and therefore it is difficult to spray to a uniform spray thickness.

Further, in the case of the conventional method, in order to move the guide bar mechanism in parallel along the tunnel wall surface in a direction perpendicular to the longitudinal direction of the tunnel, the turning table must be turned.

Since the first and second booms must be raised and raised, the third boom must be extended and retracted, and the guide bar mechanism must be rotated, the number of parts to be controlled increases and the control device becomes complicated.

The object of the present invention is to provide a method for spraying concrete on tunnel walls, which can advantageously solve the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows one embodiment of the present invention, in which a frame 7 is mounted and fixed on a trolley B having wheels 5 movable on the lower plate of a tunnel 1 in the extending direction of the wall surface 2 of the tunnel. The frame 7 includes an electric control device 8. Hydraulic control device9. A hydraulic pump 11 that is driven by the electric motor 1o and the electric motor 10 and supplies hydraulic pressure to each driving machine. Hydraulic oil tank 1
2 is equipped. Further, the trolley 6 travels by applying rotational drive to the wheels 5 by the trolley drive machine 13,
The trolley 6 is moored at a fixed position by extending the outriggers 14 attached near the wheels 5 using hydraulic pressure and press-fitting them to the lower plate 4.

A telescopic member 16 extending in the front-rear direction is fitted into a slide bearing 15 provided inside the frame 7 so as to be movable in the front-rear direction, and a female screw member 17 fixed to one end of the telescopic member 16 includes: Moving line rod 1 that extends in the front and back direction
9 are screwed together, and the end of the wire rod 19 is connected to the rotating shaft of a telescopic drive device 18 fixed to the end within the frame Z.
By rotating the wire rod 19 in one direction or the other, the telescopic member 16 is moved forward or backward in the direction in which the wall surface 2 extends.

A rotary drive device 20 and a rotary reducer 22 driven by the rotary reducer 22 via a joint 21 are fixed to the other end of the telescopic member 16, and the output shaft 23 of the rotary reducer 22 is connected to the arc of the tunnel cross section. The base end of a nozzle support arm 270 is fixed to the output shaft 23 of the nozzle support arm 270, which extends in the longitudinal direction of the tunnel approximately at the center.
6, and the base end of the nozzle 250 is connected to the hole 72.
4, the nozzle 25 is connected to a concrete pumping machine or the like, and by operating the rotation drive device 20, the nozzle 25 is rotated in a plane perpendicular to the longitudinal direction of the tunnel.

On the side of the frame 7, there is a retraction limit switch (
Hereinafter, the limit switch is abbreviated as LS) 28, the extension limit LS 29, and the drive LS 30 are attached, and the front end of the cam support member 31 extending in the front and rear direction is connected to the telescopic member 16.
The cam support member 31 is fixed to the front side thereof, and a contraction limit cam 32 and an extension limit cam 33 are fixed to the front and rear parts of the cam support member 31. The cams 34B to 34F are arranged and fixed at equal intervals in the front-rear direction, and when the retraction limit L328 is operated by the retraction limit cam 32, the retraction limit position is detected, and the elongation limit cam 33 detects the elongation limit LS2.
9 is operated, the extension limit position is detected, and the driving position of the telescopic member 16 is detected by intermittently operating the drive LS by each of the drive cams 34B to 34F.

A left rotation limit LS35 and a right rotation limit LS36 are provided near the mounting position of the rotation reducer 22 on the telescopic member 16.
is attached to the rotary cam 37 fixed to the output shaft 2 of the rotary reducer 22.
The maximum rotation angle of the nozzle 250 is detected when the nozzle 250 is operated.

Next, a method of spraying concrete using the concrete spraying machine configured as described above will be described.

The trajectory of the nozzle 25 projected onto the wall surface 2 is A-A'-B'-B-C-σ as shown in FIG.
The vehicle will be automatically driven to pass through... That is, nozzle 2
5 is rotated in a plane perpendicular to the tunnel longitudinal direction from one lower part of the tunnel peripheral wall to the other until it reaches the other lower part, then moved forward a short distance, and then rotated until it reaches the other lower part of the tunnel peripheral wall. It is rotated in the opposite direction in a plane perpendicular to the longitudinal direction, and the same operation is repeated thereafter, so that it is moved in a zigzag pattern in the longitudinal direction of the tunnel over the entire circumference of the tunnel wall surface.

When performing automatic operation of such a nozzle trajectory, first, the telescopic member 16 is retracted to the maximum retraction limit, and as shown in FIG. The trolley 6 is moored by the arator ff14 in a state facing the construction start point A in the figure.

Regarding the arrangement dimensions of each cam and LS, for example, the total distance of telescopic movement is -4-100011LIL, and A-B
- If one pitch of the drive of C-D-E-F is 200jLIE, the reduction limit LS28, the reduction limit cam 62, and the drive L
S30 at the same position, and with this position as a reference, the extension limit LS29'e2001JL position, the extension limit cam 66 at the 12001JL position, and the drive cam 34B.
, 34C, 34D, 34g, and 34F are arranged at positions every 200 elbow pitches, and the left rotation limit LS filter 5 and the right rotation limit, 53 (S) are arranged at the angular positions of point A and point, respectively. Set up

Next, a command for automatic operation is given to the electric control device 8.

The electric control device 8 and the hydraulic control device 9 operate the rotary drive device 20 in accordance with the commands to rotate the nozzle 25 clockwise from point A toward point A'. When the nozzle reaches the point, the rotary cam 67 activates the right rotation limit LS66, so that the detection signal stops the operation of the rotary drive device 20, and then the telescopic drive device 18 is operated in the extension direction. The nozzle 25 moves from point N to point B'.

When the nozzle 25 reaches point B', the drive cam 34B operates the drive LS30, so that the extension movement is stopped by the detection signal of S30, and then the rotary drive device 20 is operated and the nozzle 25 is turned on. Rotate counterclockwise from B' to point B.

When the nozzle reaches point B, the rotating cam 37 moves to the left rotation limit LS.
35 is activated, the rotation drive device 20 is stopped by the detection signal of the LS 35, and the telescopic drive device 18 is then operated in the extension direction to move the nozzle from point B to point C.
Move to. When the nozzle reaches point C, the drive cam 34C
operates the inching LS 30, and the detection signal from the LS 0 stops the operation of the telescopic drive device 18. Then, the same operation as described above is performed, and the nozzle 25 moves to C-σ-D.
It is moved as if tracing the trajectory of '-D-E-FLF.

When the nozzle 25 reaches point F', the drive cam 34F moves to LS3.
0 is activated, the extension direction operation of the telescopic drive device 1B is stopped by the detection signal of the LS30, and then the rotary drive device 20 is operated to move the nozzle 25 from point F' to point F.
Turn left towards.

At the same time that drive cam 34F operates LS30, extension limit cam 33 also operates limit LS29.

Next, the nozzle 25 reaches point F, the rotation cam 37 operates the left rotation limit LS35, and the rotation of the nozzle 25 is stopped.

Then, the completion of one cycle of operation of the υ nozzle 25 is detected by the operation of LS29 and LS35.

Next, the telescopic drive device 18 is operated in the shortening direction, and the telescopic member 1 is
6 to the maximum shortening length, release the mooring of Aratori'/14, and operate the bogie drive machine 13 to move the bogie 6 to point F.
For example, point A'' located at a distance of 2 DOmx is set as the starting point of the next cycle, and the same operation as above is performed continuously.

According to this invention, the rotation drive device 20t is operated to rotate the nozzle 25 in a plane perpendicular to the tunnel longitudinal direction from one lower part of the tunnel peripheral wall toward the other lower part, so that the nozzle 25 When the other lower part of the peripheral wall is reached, the detection signal from the limit switch causes the rotary drive device 20 to stop operating and the telescopic drive device 18 to move the nozzle 25tl forward in the longitudinal direction of the tunnel. When the has moved forward by a predetermined short distance, the operation of the telescopic drive device 18 is stopped in response to a detection signal from the limit switch, and the rotary drive device 20 is operated to move the nozzle 25 toward the lower part of the tunnel peripheral wall along the length of the tunnel. When the nozzle 25 reaches the lower part of the tunnel peripheral wall, the rotation drive device 20 is stopped in response to a detection signal from the limit switch, and the telescopic drive device 18 is started. The nozzle 25 is moved forward by a short distance in the longitudinal direction of the tunnel, and the same nozzle movement is repeated thereafter, so that the nozzle 25 is automatically moved in the longitudinal direction of the tunnel while moving at a constant speed all around the circumferential wall of the tunnel. It is possible to spray concrete continuously over the entire circumference of the tunnel wall by moving it in a zigzag pattern, and as a result, it is possible to automatically spray concrete to a nearly uniform thickness over the entire circumference of the tunnel wall. Since the concrete is sprayed in an arch shape against the tunnel peripheral wall, the tunnel supporting force due to the arch effect can be exerted at an early stage. Further, the rotation of the nozzle 25 due to the operation of the rotation drive device 20 and the telescopic drive device 1
The nozzle 25 is moved in a zigzag manner in the longitudinal direction of the tunnel over the entire circumference of the tunnel peripheral wall by moving the nozzle 25 a short distance forward through the operation in step 8 and switching the operation using the limit switch. Effects such as being able to be moved can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view showing the state in which concrete is being sprayed, Fig. 2 is a front view thereof, and Fig. 3 is a concrete FIG. 4 is a side view of the expansion/contraction detection device, and FIG. 5 is a schematic perspective view showing the nozzle trajectory when continuously spraying concrete.

Claims (1)

[Claims] A telescopic drive device 18 is attached to the frame 7 of a concrete spraying machine.
A telescoping member 16 that is telescopically moved in the longitudinal direction of the tunnel by the operation of the telescoping member 16 is fitted, and a rotation drive device 20 is attached to the telescoping member 16.
Equipped with a nozzle support arm 27 that can be rotated in the direction around the tunnel wall surface, a nozzle 25 for spraying concrete toward the tunnel wall surface is attached to the arm 27,
The rotation driving device 20 is operated to rotate the nozzle 25 from one lower part of the tunnel peripheral wall to the other lower part in a plane perpendicular to the longitudinal direction of the tunnel, so that the nozzle 25 moves to the other lower part of the tunnel peripheral wall. When the rotational drive device 20 is stopped in response to a detection signal from the limit switch, the telescopic drive device 18 is operated to move the nozzle 25 forward in the longitudinal direction of the tunnel, so that the nozzle 25 moves forward by a predetermined short distance. When the limit switch detects a signal, the operation of the telescopic drive device 18 is stopped and the rotation drive device 20 is stopped.
The nozzle 25 is rotated in a plane perpendicular to the longitudinal direction of the tunnel toward the lower part of the tunnel peripheral wall, and when the nozzle 25 reaches the lower part of the tunnel peripheral wall, the detection signal of the limit switch is activated. The operation of the rotary drive device 20 is stopped and the telescopic drive device 18 is operated to move the nozzle 25 forward by a short distance in the longitudinal direction of the tunnel, and the same nozzle movement is repeated thereafter. Method of spraying concrete on tunnel walls.