JPH0613837B2 - Concrete spraying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mainly controls the composition of the sprayed concrete depending on the spraying position when concrete is sprayed in order to prevent the collapse of the ground in a tunnel or a highway. The present invention relates to a concrete spraying device which is automatically changed.

(Prior art) Conventionally, when concrete is sprayed on the inner surface of a tunnel or a highway, the composition of the sprayed concrete is determined in consideration of the condition of the ground, the design strength as a supporting member, rebound, dust, etc. The concrete mixed with the determined mixture was sprayed with a spraying machine onto the parts of the ground with a uniform mixture of concrete.

(Problems to be Solved by the Invention) However, the conditions required for the shotcrete for the inner surface of the tunnel or the anti-road differ depending on the position. For example, the top end has the lowest strength, but the top end has the highest rebound and dust generation.

Conventionally, the concrete mix was decided based on the conditions required at the top, and the shoulder and side walls other than the top were also sprayed in the same way with the decided mix. Among the materials, there is a problem that it is uneconomical because the relatively expensive cement and the quick-setting agent are consumed more than necessary.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, various material bins for containing a concrete compounding material, a supply amount variable feeder connected to these various material bins, and each of these It is equipped with a spraying machine that mixes the materials supplied from the variable feeder and discharges fresh concrete, and a detector that detects the spraying position of the concrete, and the supply amount variable feeder is controlled by the detection signal of this detector. Form a concrete spraying device.

(Operation) As described above, in the present invention, in the concrete spraying work in the tunnel or in the anti-road, etc., the mix of sprayed concrete is automatically changed according to the spraying position. The mix at the position can be determined by a test or the like, the spray position can be detected, and the concrete can be adjusted to a mix suitable for the spray position.

Therefore, according to the present invention, it is possible to automatically adjust the mixing ratio of the shotcrete suitable for the position according to each position such as in the tunnel or the anti-road, so that there is no excess or deficiency in the mixing material, and as a result, overall In comparison, the amount of relatively expensive cement and quick-setting agent used is reduced, and economical concrete spraying work can be performed.

(Example) Hereinafter, the Example of this invention is described about drawing.

In the figure, 1 is the inner wall surface of the excavated tunnel, 2 is its bottom, 3
Is a concrete mobile, and 4a to 4e are material bottles for accommodating various mixing materials of concrete provided in the concrete mobile 3. For example, 4a is for cement, 4b is for sand, 4c is for sand, 4d is for water, and 4e is a material bottle for quick-setting agent. Further, 5 is a supply amount variable feeder connected to each of the discharge ports of the material bins 4a to 4e, 6 is a belt conveyor for conveying the material discharged from each of these feeders 5, and 7 is for receiving these materials. It is a spraying machine for kneading and then discharging it to the hose 8. Note that the above-mentioned water material bottle 4d
Water supplied from the spraying machine 7 may be directly supplied to the spraying machine 7 via a hose (not shown) or the like.

Further, 9 is a spray nozzle connected to the tip of the hose 8, and 10 is a concrete spray robot that holds the spray nozzle 9 and sprays concrete onto the inner wall surface 1 of the tunnel. The robot 10 moves in the tunnel and rotates the spray nozzle 9 as shown by arrows C and D in FIG. 2 to spray concrete onto the inner wall surface 1 of the tunnel. Further, 11 is an inclination angle detector as a detector for detecting the concrete spraying position, and FIGS. 3 and 4 show an example of the inclination angle detector 11.
12 is an outer box, 13 is an opening / closing door, 14 is a handle, 15 is an outlet for an electric cord (not shown), 16 is a board provided in the outer box 12, 17
Is a central shaft, 18 is a proximity switch mounting disc provided on the central shaft 17 so as to be rotatable and adjustable, 19 is a fixing screw for fixing the disc 18, and 20 is a circle provided on the proximity switch mounting disc 18. Arc-shaped groove, 21 is a proximity switch mounting bracket that is installed along the groove 20 by screws 22 so that the mounting position can be adjusted, and 23 is this mounting bracket.
Proximity switch fixed to 21, 24 is an angle detection plate rotatably provided at the tip of the central shaft 17 via a bearing 25, 24a
Is a projecting piece formed on the upper part thereof so as to face the proximity switch 23, and 26 is a weight fixed to the lower end of the angle detection plate 24.

Next, the operation of the device of the present invention configured as described above will be described.

In FIG. 1, fresh concrete mixed by a spraying machine 7 is pressure-fed to a spraying nozzle 9 through a hose 8, and the spraying nozzle 9 rotates in the direction of arrow C or D in FIG. It is sprayed on the inner wall surface 1 of.

Now, for example, an appropriate shotcrete mixture for the top end portion between A and B in FIG. 2 is referred to as a mixture I in Table 1, and is suitable for other than the top end portion between A and B, that is, for the shoulder portion and side wall portion of the tunnel. The composition of the sprayed concrete is referred to as the composition II in Table 1.

In this case, in the present invention, when the spray nozzle 9 is between A and B, the inclination angle detector 11 detects it and is connected to the various material bins 4a to 4e of the concrete mobile 3 shown in FIG. By sending an electric signal to each supply amount variable feeder 5, each feeder 5 is set to be operated and controlled so as to satisfy the formulation I in Table 1, and the spray nozzle 9 is set to A ~.
When it is not in the top end portion of B, the electric signals from the tilt angle detector 11 are used to set each feeder 5 so as to satisfy the formulation II in Table 1.

In this way, the top portion of the tunnel is sprayed with concrete in a suitable mix, and the shoulders and sidewalls other than the top part also have a different mix from the top part and that part Concrete with the right mix will be sprayed automatically.

Conventionally, the concrete was sprayed on the entire inner wall surface of the tunnel with the mixture I in Table 1, but according to the present invention, since the mixture II in Table 1 is used except for the top end portion, various mixture materials can be used accordingly. Usage changes.

Table 2 shows 1 of various compounding materials based on the present invention when the conventional method and the case of the present invention are compared.
It shows the amount of change (unit: kg) per m ³ .

That is, according to the present invention, the amount of relatively expensive cement and quick-setting agent used is reduced, so that concrete spraying work can be made economical as a whole.

(Effects of the Invention) As described above, in the present invention, in the concrete spraying work in the tunnel or in the anti-road, etc., the composition of the sprayed concrete is automatically changed according to the spraying position. It is possible to determine the mixture at each position by a test or the like, detect the spraying position, and adjust the concrete to a mixture suitable for the spraying position.

Therefore, according to the present invention, it is possible to automatically adjust the mixing ratio of the shotcrete suitable for the position according to each position such as in the tunnel or the anti-road, so that there is no excess or deficiency in the mixing material, and as a result, overall In this case, the amount of relatively expensive cement or quick-setting agent used is reduced, and an excellent effect that economical concrete spraying work can be performed is obtained.

[Brief description of drawings]

1 is a side view showing a working state in a tunnel of the device of the present invention, FIG. 2 is a front view of a spraying robot in the tunnel, FIG. 3 is a front view of an internal mechanism showing an example of a tilt angle detector, FIG. 4 is a side view thereof. 1 ... Inner wall of tunnel, 2 ... bottom surface 3 ... Concrete mobile 4a-4e ... Various material bins 5 ... Variable supply feeder 6 ... Belt conveyor, 7 ... Spraying machine 8 ... Hose, 9 …… Spray nozzle 10 …… Concrete spray robot 11 …… Inclination angle detector (position detector)

Claims (1)

[Claims] Claims: 1. Various material bins for containing concrete compounding materials, variable-feed-rate feeders connected to these various material bins, and a spraying machine for kneading the materials supplied from these variable feeders and discharging fresh concrete. And a detector for detecting a concrete spraying position, and the supply amount variable feeder is controlled by a detection signal of the detector.