JPH0532558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spraying device used in the so-called NATM construction method, etc., which sprays concrete onto the inner surface of a tunnel to stabilize it.

[Conventional technology] In recent years, the NATM method, which uses rock bolts and concrete spraying in combination, has been widely used.In implementing this method, a boom is installed at the tip of a traveling trolley, and while the boom is moving, a concrete spray nozzle is inserted into the tunnel. Various devices have been proposed in which the device conforms to the inner surface, and some of these prior art techniques disclose that a plurality of booms are provided at the tip of a traveling truck.

[Problem that the invention seeks to solve]

Although the prior art discloses the provision of a plurality of booms, only one boom is used for spraying, and there is no idea of spraying using two booms. However, in recent years, as tunnel excavation technology has progressed, tunnels have tended to have larger cross-sections, and it has become necessary to excavate long tunnels. If this is done, construction efficiency will be poor and the above trends cannot be adequately addressed.

Therefore, the present inventors focused on performing spraying construction at the same time using two booms, and in the process of implementation, when moving the two booms individually and simultaneously, the boom It was discovered that the risk of collision cannot be avoided by the operator's caution alone.

Therefore, the main purpose of the present invention is to significantly improve the spraying efficiency, to reliably avoid collisions of boom devices, and to prevent damage to the other boom device when one boom device breaks down or requires maintenance. To provide a spraying device that can continue spraying work by covering even areas that have been covered by one boom device.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems by installing two boom devices on a base having concrete spraying parts at their tips spaced apart in the width direction of the tunnel. Each boom device
The swing control device has a swingable area in which the swing areas overlap and collide with each other when not restricted by the swing restriction device; The present invention is characterized in that at least one of the swing drive section and the swing follower section of the boom device is stopped, and the swing restriction can be canceled by an external operation.

[Effect]

In the present invention, since spraying is performed from two locations using two boom devices, the efficiency is doubled at least to that extent. In addition, when one boom device is stopped due to failure or maintenance, waiting until it can be restarted is extremely difficult because it requires stopping the concrete pumping system and making preparations for restarting. It's not efficient, and operators end up having to play around, which increases construction costs. On the other hand, when one boom device stops, the other boom device moves into the burden area of the other boom device and continues spraying, allowing continuous and efficient spraying work. .

However, as it is, when the two boom devices are moved individually, their range of motion overlaps.
There is a risk that the two boom devices will collide if the athlete's caution is exceeded. Therefore, according to the present invention, if a swing restriction device is provided, interference and collision between the two boom devices can be prevented, and damage and unexpected accidents can be prevented. On the other hand, if the swing control device is always activated, it will not be able to cover the spraying load when one boom stops, so in this case,
If the restriction by the turning restriction device is released, spraying can be performed over the entire target cross-sectional area of the tunnel.

[Specific structure of the invention]

The present invention will be explained in more detail below with reference to embodiments shown in the drawings.

1 to 4 are general views of the spraying device of the present invention, in which a boom device X and a second boom device Y are attached to a first front portion of a traveling vehicle 1 serving as a base. A spraying machine 3 supported by a frame 2 is installed at the rear of the vehicle 1, and the frame 2 is raised by a lifting means (not shown) provided at the rear of the vehicle when traveling and lowered to the ground during spraying work. It's becoming like that. The spraying machine 3 is equipped with an upper hopper 3A at the top that divides the concrete supplied from one input port into two equal amounts, and receives the concrete distributed and supplied through the upper hopper 3A, and then distributes the concrete through a hose 4. Spray Nols 5X, 5
It is an air pressure feeding type equipped with a rotor 3B for separately feeding pressure to Y, and its basic configuration is
It is known from the publication No.-83468.

Reference numeral 7 denotes an quick-setting agent supply device for automatically supplying an quick-setting agent to the middle of the hose 4, 8 is a tractor, 9 is a power unit, 10 is a driver's seat, and 11 is an outrigger.

Next, to explain the boom devices X and Y in detail, they are mounted on a shaft support 12 erected at the front of the vehicle 1.
It has rotation centers Cx and Cy in the direction of the tunnel line, and is rotatably supported via a rotating shaft 13 along the cross section of the tunnel (see FIG. 2).

That is, as shown in FIG.
The holding board 14 is configured to rotate together with the rotating shaft 13, and a driven gear 15 is integrated on the back side of the holding board 14, and a hydraulic motor 16 fixed to the back side of the shaft support 12 is connected to the holding board 14. A driving gear 17 attached to the output shaft meshes with the driven gear 15, and when the hydraulic motor 16 is operated, its rotational torque is transmitted to the holding board 14 via the gears 17 and 15. The holding board 14 is configured to rotate around rotation centers Cx and Cy, respectively.On the other hand, mounting plates 19, 19 for the elevation shaft 18 are attached to the holding board 14, and a first
The boom 20 is designed to be tilted up and down by, for example, 60 degrees as the first cylinder 21 expands and contracts. A second boom 22 is connected to the tip of the first boom 20 via a pin 23, and a second cylinder 24 expands and contracts around this pin 23 by, for example, 60 degrees (in FIG. 1, the swing angle limit is indicated by the solid line X). (shown as a second boom 22 of the system and Y system) is capable of swinging. A third cylinder 25 for forward and backward movement is fixed to the tip of the second boom 22, and an arm 26 is fixed to the third cylinder 25. A third boom 27 is fixed to both ends of the rod 25a of the cylinder 25, and moves forward and backward as the third cylinder 25 expands and contracts. Additionally, a fourth swing cylinder 27A is installed between one end of the arm 26 and the third boom 27 so that the nozzles 5X and 5Y swing at a swing angle of 120 degrees as shown in FIG. It is being This swing center is the center of the third cylinder 25.

A fourth boom 29 is attached to the tip of the third boom 27 via a bracket 28, and a bracket 30 is further attached to the tip of the third boom 27.
The fifth boom 31 is attached via the
A boom 31 holds the nols 5X and 5Y at its tip. The angle between the third boom 27 and the fourth boom 29, and the angle between the fourth boom 29 and the fifth boom 3
The angle formed by 1 is, as shown by the imaginary line in Figure 1,
The angle is variable by 60 degrees, and the angle is changed by changing the positions of the triangular bolt insertion holes in the mounting brackets 28 and 30, respectively.

According to the boom device configured in this way, the individual operations such as turning, elevation, swinging, forward and backward movement described in detail above work together, and the length of L in Fig. 1 is adjusted in the direction of the tunnel. In the cross-sectional direction of the tunnel, the nozzles 5X and 5Y are moved toward the inner surface of the tunnel by moving the entire area surrounded by a large circle and a small circle centered on the rotation centers Cx and Cy in Fig. 2. It is possible to perform concrete spraying from

However, when each boom device X, Y crosses the area Sx, Sy and enters the other party's area, normally two people, one on each side and one on each side, operate the boom devices X, Y mutually. There is a risk of collision. Therefore, in the present invention, in order to avoid this collision,
A turning restriction device is provided.

In the embodiment, dual regulation is performed using two methods.

That is, part 1 is a holding board 1 that protrudes from the back side of the shaft support 12 as shown in FIGS. 6 and 7.
A cam plate 33 with a protruding portion 33a is attached to one end of the connecting shaft 32 which rotates together with the actuator 35a.
When a limit switch 35 having a
3a strikes the actuator 35 to operate the limit switch 35, and based on this, the hydraulic motor 16 that rotates the holding board 14 is stopped.

However, in order to ensure further safety, as shown in FIG. 5, a collision plate 36 is attached to the holding base plate 14 so as to protrude forward (towards the front of the paper in FIG. 5), and a collision plate 36 is attached to the base of the vehicle 1. 37 is similarly projected, and when the turning limit is reached, the collision plate 36 abuts against the collision receiving plate 37, thereby stopping further rotation.

Note that the above-mentioned turning restriction device may be based on only one means, or other modifications may be considered. Part 1 above uses a hydraulic motor as a swing driving part, and Part 2 uses a holding board 1 as a swing driven part.
4 is stopped.

Thus, each boom device X, Y has an area Sx, Sy
Turning restrictions are in place that do not exceed.

In this case, if one boom device is stopped due to a failure or maintenance, it is efficient to stop the entire spraying device and wait for it to restart. Therefore, if one boom device stops, move it to a position where it does not interfere with the movement of the other boom device, or remove the entire boom device from the vehicle 1, so that spraying by the other boom device alone is not possible. In order to continue, the hydraulic motor 16 must be electrically switched so that it does not stop even if the limit switch 35 operates, or the collision plate 37 must be fastened to the vehicle 1 with the mounting bolt 3.
8 and remove it to cancel the turning restriction.

〔Effect of the invention〕

As described above, according to the present invention, construction efficiency is greatly improved, collisions of boom devices can be avoided, and the entire cross section of a tunnel can be sprayed with one boom device.

[Brief explanation of the drawing]

FIG. 1 is a front view of the entire spraying device according to the present invention;
Figure 2 is a right side view, Figure 3 is a plan view, Figure 4 is a left side view, Figure 5 is a right side view of the boom attachment part,
FIG. 6 is a view of the first means of the rotation regulating device as seen from the back side of FIG. 5, and FIG. 7 is a perspective view thereof. X, Y...Boom device, 1...Traveling vehicle, 3...
... Spray machine, 4... Hose, 5X, 5Y... Spray nozzle, 10... Driver's seat, 12... Axial support, 13...
Rotating shaft, 14... Holding board, 15... Driven gear,
16... Hydraulic motor, 17... Driving gear, 33...
...Cam plate, 35...Limit switch, 36...
Collision plate, 37... Collision receiving plate, L, Sx, Sy... Movable area, 38... Mounting bolt.

Claims (1)

[Claims] 1. Two boom devices equipped with spraying parts of concrete at the tips are installed on the base at intervals in the width direction of the tunnel, and the center of rotation is in the direction of the tunnel line, and the boom devices are rotatable along the cross section of the tunnel; Each boom device has a swingable area in which the swing areas overlap and collide with each other when not restricted by the swing restriction device; Concrete on the inner surface of a tunnel, characterized in that the structure is such that at least one of the swing driving part or the swing driven part of the boom device is stopped when the boom device reaches the peak temperature, and the swing restriction can be canceled by external operation. Spraying equipment.