JPH0666026A - Spraying work method and spraying device - Google Patents

Abstract

PURPOSE:To easily and efficiently carry out the adjustment of mixing to a spraying main material and mixing amount irrespective of the kind of material of a reinforcing fiber to be mixed to make the device convenient and compact. CONSTITUTION:A spraying main material 17 mixed in a compression container 20A is fed forcibly to a force-feed hose 8 by compressed air fed from a compressor 6. A sealed container 22 in which compressed air is introduced is provided with a bobbin 25 on which reinforcing fiber 26 is wound and a cutter roller 32. The reinforcing fiber is cut to a specified length in the sealed container 22, force-fed through a pipe 40 together with compressed air, and mixed with the spraying main material 17 in the force-feed hose 8. A spraying material in which the reinforcing fiber 26 is mixed is force-fed through the force-feed hose 8 by the compressed air, and sprayed from a nozzle 9 together with compressed air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mortar, a fresh concrete, which is sprayed on a road slope, a mountain slope, a building wall surface, a structure surface, etc. in order to prevent collapse, peeling, washout, etc.
TECHNICAL FIELD The present invention relates to a spraying method and a spraying device for a fluid spraying material that has improved strength and durability by spraying a fluid spraying material such as greening soil with a reinforcing fiber.

[0002]

2. Description of the Related Art FIG. 6 (A) shows air using compressed air.
The figure which shows the state which is performing the spraying work of a fresh concrete on the slope of a mountainous area using a pressure feeding type spraying device, and the same (B) is the partial plan view. In FIG. 6, 5a, 5b, 5
Each of c is a raw material of a spraying material such as gravel, sand, and cement, and these are placed in different mountain shapes. Of these raw materials, gravel 5a and sand 5b are used as hopper-4a,
Place several batches on 4b, belt conveyor 2a,
2b to the batcher scale 3, cement 5c also to the batcher scale 3 by the belt conveyor 2c, the batcher scale 3 measures each predetermined amount, and the belt conveyor 2 sprays the machine 1 And knead by adding a predetermined amount of water. The raw concrete thus created is pumped through a pumping hose 8 by compressed air generated by a compressor 6 (the compressor 6 is driven by a motor driven by electric power generated by a generator 7). Then, it is discharged together with the compressed air from the discharge nozzle 9 at the tip of the pressure-feeding hose 8 held by the operator and sprayed on the slope of the mountainous area to protect the rock surface.

Incidentally, the spraying machine is a self-propelled vehicle having upper and lower two stages, and pressure vessels 20A and 20B with built-in stirring blades (see FIG. 1,
(See FIG. 2) mounted, pressure vessels 20A, 20B
A slide valve 20b is provided between the pressure vessel 20 and the upper pressure vessel 20.
B has a lid for introducing the main spray material from the conveyor 2 and a pressure relief valve. When introducing the main spray material from the conveyor 2, a slide valve 20 between the pressure vessels 20A and 20B is used.
While closing b, while blowing the spraying main material from the pumping hose 8 onto the mountain slope, the lid of the upper pressure vessel 20B is opened and the spraying main material is pushed upward. Container 20B
Then, the lid of the upper pressure vessel 20B is closed and the internal pressure is increased, and the main spray material and water in the upper pressure vessel 20B are stirred and mixed. Then, when the level detector or the like detects a decrease in level of the main spray material in the lower pressure vessel 20A, the slide valve 2 between the pressure vessels 20A and 20B is detected.
0b is opened, and the main spray material in the upper pressure vessel 20B is allowed to flow into the lower pressure vessel 20A. After that, the operation of closing the slide valve 20b, opening the pressure release valve of the upper pressure vessel 20B and opening the lid, and introducing the spraying main material from the conveyor 2 is repeated in the same manner as described above.

As described above, as an efficient method for stabilizing the conventionally sloping ground and performing the greening work, a fluid spraying material such as mortar, fresh concrete or soil for greening is compressed with compressed air. At the same time, a spraying method is applied in which the surface is sprayed to form a protective layer.

In order to improve the strength and durability of the spray material, fibrous metal, glass fiber, synthetic resin fiber or the like may be mixed and sprayed as a reinforcing material in the main spray material. It is being appreciated.

FIG. 7 is a diagram showing a case where steel fibers (steel fibers) that are most often used for reinforcing raw concrete are mixed and used as reinforcing fibers.

First, the gravel 5a and the sand 5b are weighed in a predetermined amount by the weighing machine 11, and the cement 12 which is quantitatively determined by bagging is put into the mixer 13 by the belt conveyor 2. Further, a predetermined amount of water 16 weighed by the weighing machine 11b is added and kneaded to prepare a fresh concrete. 0.5m thick on the raw concrete in this mixer
A steel fiber 14 having a length of m and a length of about 30 mm is weighed by a weigher 11a, and a predetermined amount is added while being loosened by a steel fiber disperser 15, and further kneaded to make a steel fiber in a raw concrete. Create a spray material with a uniform distribution of −.

Next, the raw concrete mixed with the steel fiber is carried to the hopper-4A by the belt conveyor 2,
Appropriately conveyed to the spraying machine 1 by the belt conveyor 2 and the compressor 6
It is discharged together with the compressed air from.

As a method of mixing the reinforcing fiber with the blowing material, as in the case of mixing the above-mentioned steel fiber, the reinforcing fiber cut in advance is used as a blowing main material such as raw concrete. In addition to the method of kneading with a mixer, known examples include JP-A-2-232421 and JP-A-2-232421.
As disclosed in Japanese Laid-Open Patent Publication No. 256719, filamentous long fibers are continuously fed at a jetting pressure of compressed air without being cut,
There is a method in which the reinforcing fiber is discharged from the tip of a spraying nozzle and sprayed onto the ground together with a spraying main material such as fresh concrete.

What is important when the reinforcing fibers are mixed and sprayed with the main spraying material is that the reinforcing fibers are uniformly dispersed in the main spraying material and the main material goes around the reinforcing fibers. It is to function as a composite after curing of the sprayed main material. For this reason, it is necessary to accurately measure, mix, and uniformly knead each material, and if this condition is not satisfied and the reinforcing fibers are significantly unevenly distributed or the mixing ratio is insufficient, the target The characteristics such as strength and durability are not fully exhibited.

[0011]

However, in order to uniformly knead the reinforcing fiber 14 in the mixer 13 with the conventional apparatus shown in FIG. 7, the reinforcing fiber supplied in a bundle form. It takes a lot of time such as loosening by the disperser 15 and time for kneading, resulting in poor work efficiency, and it was necessary to upsize the mixer 13 in order to synchronize the spraying work and the kneading work. Further, a disperser 15 for evenly distributing the reinforcing fibers 14 on the main spray material in the mixer 13 was also required.

Further, since the spray material mixed with the reinforcing fibers 14 has poor fluidity and becomes difficult to flow to the pressure-feeding hose 8, the amount of the reinforcing fibers 14 to be mixed is limited, and the mixer 13 is used. There was a problem that it was limited to materials with good diffusivity so that they would not be entangled inside each other to form a dumpling.

On the other hand, as described in the above publication, when the filamentous long fibers are not cut and continuously blown together with the blowing main material, it is difficult to adjust the mixing amount, and the fibers are cut during the feeding. In that case, there was a problem in work such that the fiber could not be fed to the smooth.

The above-mentioned problems also occur in the pump pressure type spraying device in which the main spraying material is pumped.

In view of the above-mentioned problems, the present invention, when spraying a spraying material by an air-pressure feeding method or a pump pressure-feeding method, irrespective of the kind of the reinforcing fiber material, is applied to the main blowing material. An object of the present invention is to provide a spraying method capable of easily and efficiently mixing and adjusting a mixing amount, and a simple and compact spraying device.

[0016]

In order to achieve the above-mentioned object, the spraying method according to the present invention has a bobbin wound with a reinforcing fiber in an openable and closable sealed container, and the reinforcement wound around the bobbin is reinforced. It is characterized in that the reinforcing fibers are cut while being fed out and sprayed onto the ground with compressed air together with the main material for spraying, or the reinforcing fibers are mixed with the main spraying material and sprayed onto the ground with compressed air.

In order to achieve the above-mentioned object, the spraying device according to the present invention is provided with a spraying main material, and compressed air is used to press the spraying main material from the lower discharge port to the surface to be sprayed.
A pressure vessel to be discharged to the space, a bobbin wound with reinforcing fibers in a hermetically sealed vessel into which compressed air is introduced, and a reinforcing fiber cutting device, and to a portion after the discharge port of the pressure vessel. The present invention is characterized by having a merging portion for merging the blown main material and the cut reinforcing fibers and feeding them to the pressure feeding hose. A pump may be used as the pressure-feeding device for the main spray material instead of the pressure vessel.

[0018]

In the present invention, the reinforcing fiber cut by a cutter roller or the like in a sealed container is pressure-fed with compressed air, and is mixed with or mixed with a blowing main material fed by air or pump. Instead of spraying on the surface to be sprayed.

[0019]

EXAMPLE FIG. 1 is a schematic view of an air-pressure type spraying device according to an embodiment of the present invention, in which reinforcing fibers are mixed with a main spraying material such as fresh concrete, and compressed air is used. The figure shows a state where spraying work is being performed on the slope of a mountainous area. In this work, first, the raw material of the main spraying material such as cement, sand, gravel, etc. is supplied to the spraying machine 1 from the belt conveyor-2, and the raw material of this main material is supplied together with water to the pressure vessels 20A,
The mixture is kneaded with 0B to prepare a fluid spraying main material 17 (see FIG. 2) such as fresh concrete in the pressure vessels 20A and 20B. The spray main material 17 is continuously pressure-fed from the discharge pipe 21 provided in the lower portion of the pressure container 20A by the above-described operation, and is fed from the sealed container 22 to the spray main material 17. While the reinforcing fibers are being mixed, the compressed air supplied from the compressor 6 is pressure-fed in the pressure-feeding hose 8 and is sprayed on the slope of a mountainous area to protect the mountain surface.

FIG. 2 is a partially enlarged sectional view of FIG. 1 showing the pressure vessel 20, the sealed vessel 22 and the reinforcing fiber feeding section. As shown in FIG. 2, the pressure vessel 20A has a rotating stirring blade 20c therein. After the spraying main material 17 is charged from the upper pressure vessel 20B, the upper slide valve 20b is closed to close the pressure vessel 20A. It has a structure capable of sealing the inside, and a discharge pipe 21 is connected to the lower discharge port 20a. The discharge pipe 21 is a fiber joining portion 21 for reinforcement.
a, and the pressure feed hose 8 is connected to the downstream side thereof.

The compressed air supply pipe 6a of the compressor 6 is connected to the pressure vessels 20A and 20B via a branch pipe 6b having valves 19A and 19B, and a pressure sensitive flow switch is provided on the pipe 40 downstream from the branch portion. 18, sealed container 2
2. A check valve 24 and a valve 27 are provided, and the downstream end portion is connected to the reinforcing fiber merging portion 21a of the discharge pipe 21.

As shown in FIG. 3 which is a partially enlarged view of FIG. 2 and FIG. 4 which is a sectional view taken along the line EE of FIG. 3, the hermetically sealed container 22 includes a bobbin 25 having reinforcing fibers wound therein and a reinforcing fiber. A feed roller 30, a reinforcing fiber cutter roller 32, and a press roller 31 are provided. The sealed container 22 has an opening structure on one side, and the opening surface is a lid 2 that can be opened and closed by attaching and detaching a bolt 23.
2a is closed via a sealing packing 22g. A cylindrical projection 22b is provided on the other surface of the hermetic container 22, and a shaft 25a of the bobbin 25 is mounted in the cylindrical projection 22b via a bearing 22c and a seal packing 22h. This bobbin shaft 25a is detachably fitted with a bobbin 25 having reinforcing fibers 26 wound around it, and is fixed by pressing it with a pressing handle 29. The bobbin shaft 25a is provided with a shaft joint 22e at the end opposite to the bobbin 25 mounting portion. The electromagnetic brake 28 is connected to prevent the bobbin 25 from rotating due to inertia.

Next, the mounting structure of the rollers 30 to 32 will be described. A roller mounting plate 22f is erected from the bottom surface of the sealed container 22.
One side of the shafts 30a to 32a of the rollers 30 to 32 is supported by f. Reference numeral 35 denotes a cover plate facing one end of the roller mounting plate 22f. The shaft 30a of the feed roller 30 is fixed to the roller mounting plate 22f, and the other end is detachably fitted to the cover plate 35. The feed roller 30 is rotatably fitted to the shaft 30a. is doing. In the press roller 31, the bearing 31d is slidably fitted in the roller mounting plate 22f and the elongated hole 31e of the cover plate 35, and the shaft 31a is fitted in the bearing 31d. -La and Kattara-La 3
The bearing 31d is pressed by the spring 31b so as to be pressed against the bearing 2.

On the other hand, the cutter roller 32 has a rotary shaft 32.
It is prevented from rotating to a and is detachably fitted. The rotating shaft 32a is a roller mounting plate 22f and a bearing 32c provided on the cover 35.
It is rotatably supported via a stopper metal fitting 34 that is screwed onto the rotating shaft 32a and is prevented from coming off together with the cover 35. The rotary shaft 32a is connected to the output shaft of the drive motor 33 via a shaft coupling 32e. The cutter roller 32 is provided with a plurality of cutters 32f at equal intervals in the circumferential direction of the roller (the illustrated example shows four cases), and the cutters 32f move in and out in the radial direction. The cushion 32b made of rubber is pushed from the inside to the outside in the radial direction. Each of the rollers 30 to 32 can be replaced by removing the cover plate 35 from the shafts 30a to 32a.

The closed container 22 has a guide bar 22k provided on the inner wall surface between the bobbin 25 and the feed roller 30. The pipe 40 for feeding compressed air is a closed container 2
2 is penetrated and an opening 40a is provided inside the closed container 22,
The closed container 22 is connected so that the cutter roller 30 and the press roller 31 are located in the opening 40a.

Next, the operation of the spraying device configured as described above will be described. First, referring to FIGS. 3 and 4, when the compressor is started and compressed air is supplied to the pipe 40 in the direction of arrow Z, the pressure sensitive flow switch 18 operates and the driving motor 33 can be operated. . Here, the driving motor 33
When the starter is started, the cutter roller 32 connected to the drive motor 33 via the shaft joint 32e rotates, and the press roller 31 pressed against the cutter roller 32 rotates by frictional force. -The feed roller 30 pressed against the roller 31 also starts to rotate. While each roller is rotating, the reinforcing fiber 26 wound around the bobbin 25 is fed out, and is fed through the guide bar 22k to the feed roller 30 and the press roller 3
1 and the reinforcing fiber 26 is placed in the electromagnetic brake 2.
While maintaining an appropriate tension by the action of 8, press roller 31
It is bitten between the cutter roller 32 and the cutter roller 32, cut to a predetermined length by the cutter 32f (the length between the circumferential blade edges of the cutter 32f), and fed to the opening 40a of the pipe 40.

The length of the reinforcing fiber 26 to be cut is arbitrary by changing the interval of the cutter 32f in the circumferential direction by attaching or detaching the cutter 32f or by changing to another cutter roller having a large number of cutters. You can adjust the length. Further, by changing the rotation speed of the cutter roller 32, the reinforcing fiber 2
The supply amount of 6 can be adjusted.

Next, referring to FIG. 2, the spray main material 17 kneaded in the pressure vessel 20A is compressed by air from the compressor 6 and is discharged from the lower discharge port 20a to the discharge pipe 21.
Pump to. On the other hand, the reinforcing fiber 2 cut into a predetermined length
6 passes through the pipe 40 together with the compressed air, and joins the merging portion 21a.
Is introduced into the pressure feed hose 8 and merges with the spray main material 17. The reinforcing fiber 26 pumped to the merging portion 21a always flows in the direction of the merging portion 21a by the check valve 24, and the pressures of the pipe A and the pressure vessel 20A are adjusted by adjusting the opening / closing of the valve 27 and the valve 19A. As a result, the main spray material 17 can be joined without hindering the pressure-feeding of the main spray material 17 to the discharge pipe 21. The main spray material 17 is the discharge pipe 21 and the reinforcing fiber 2
6 is mixed and discharged from a discharge nozzle 9 through a pressure feed hose 8.

FIG. 5 shows an example in which the present invention is applied to a pump pressure feeding type spraying device. As shown in FIG. 5, the spraying main material 17 kneaded in the material hopper-4, for example, the soil for greening, is sucked into the pressure feed pump 50 by the suction hose 41, is pressure fed by the pressure feed hose 8, and is discharged. It is discharged from the nozzle 9 and attached to the ground.

As described above, the reinforcing fibers 26 are mixed with the blowing main material 17 which is pumped under pressure,
After cutting to a predetermined length in the sealed container 22 connected in the middle of the compressed air supply pipe 40 from the compressor 6,
It is sent under pressure to the discharge nozzle 9 together with compressed air, and the main spray material 17
To join.

In FIG. 5, the components and parts having the same numbers as those in FIG. 2 have the same components and functions, and the cutting and feeding of the reinforcing fiber 26 in the sealed container 22 are carried out by the above-mentioned air. -The same construction method and device as in the case of the pressure feeding type spraying device are used.

The reinforcing fiber used in the present invention may be any fiber that can be cut with a cutter, and can be freely selected from vegetable fiber, animal fiber, mineral fiber (metal fiber) and chemical fiber.

[0033]

According to the first aspect of the present invention, since the reinforcing fibers cut to a predetermined length in the sealed container are continuously fed by compressed air, a constant amount of the reinforcing fibers is bundled. Since the labor for loosening the reinforcing fiber supplied in step 1 is unnecessary, workability is improved. In addition, when mixing with the main spray material, a device for spraying reinforcing fibers is not required. Furthermore, it is possible to feed only with the reinforcing fiber.

According to the second aspect of the present invention, since the reinforcing fiber is continuously mixed with the compressed air into the blowing main material under pressure feeding,
The mixing work efficiency is improved, and the reinforcing fibers are uniformly mixed with the spraying main material, so that the strength and durability of the spraying material are improved.

According to the third aspect of the present invention, since the reinforcing fiber is continuously mixed with the compressed air into the blowing main material being pumped,
The reinforcing fibers are smoothly mixed into the spraying main material at regular intervals, the mixing becomes uniform, and the strength and durability of the spraying material are improved.

According to the fourth aspect, the supply amount of the reinforcing fibers can be easily adjusted by changing the rotation speed of the cutter roller, and the mixing ratio of the reinforcing fibers can be optimized, so that the strength and the strength of the spraying material can be improved. The durability is improved. Further, the length of the reinforcing fiber can be optimized by changing the circumferential interval of the cutter of the cutter roller by attaching and detaching the cutter. In addition, the reinforcing fiber can be selected within a range that can be cut by changing the type of the cutter, and the reinforcing fiber suitable for the application can be used.

According to the fifth aspect, the compressed air mixed with the reinforcing fibers can be added at the tip of the spraying main material discharge nozzle, so that the reinforcing fibers can be easily and efficiently mixed even in a pumping type spraying machine. In addition, the mixing ratio can be easily adjusted regardless of the type of reinforcing fiber.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an air-pressure feeding type spraying device according to the present invention in use.

FIG. 2 is a configuration diagram showing a main part of the embodiment.

FIG. 3 is a cross-sectional view showing a reinforcing fiber feeding portion of the spraying device shown in FIG.

FIG. 4 is a sectional view taken along line EE of FIG.

FIG. 5 is a configuration diagram showing an embodiment of a pump pressure type spraying device according to the present invention.

FIG. 6A is a configuration diagram showing a usage state of a conventional spraying device, and FIG. 6B is a partial plan view thereof.

FIG. 7 is a view showing a state in which reinforcing fibers are mixed and used in a conventional spraying device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spraying machine 2 Belt conveyor 4 Hopper 6 Compressor 8 Pressure feeding hose 9 Nozzle 17 Spraying main material 18 Flow switch 19A, 19B, 27 Valve 20A, 20B Pressure container 20a Discharge port 20b Slide valve 20c Stirring blade 21 Discharge Pipe 21a Confluent part 22 Sealed container 25 Bobbin 26 Fiber for reinforcement 28 Electromagnetic brake 30 Feed roller 31 Press roller 32 Cutter roller 32f Cutter 32b Cushion 33 Motor 41 Suction hose 50 Pressure pump

Claims (5)

[Claims] 1. A bobbin wound with a reinforcing fiber is placed in an openable and closable sealed container, the reinforcing fiber wound on the bobbin is cut while being fed, and the compressed fiber is blown to the ground together with the main material. Spraying method characterized by attaching. 2. The spraying method according to claim 1, wherein the reinforcing fiber is mixed with a spraying main material and sprayed onto the ground. 3. A pressure vessel in which a main spray material is placed and which is discharged by compressed air from a lower discharge port to a pressure-feeding hose to the surface to be sprayed, and compressed air is introduced. A bobbin housed in a hermetically sealed container and wound with reinforcing fibers, and a reinforcing fiber cutting device also housed in the hermetically sealed container are provided, and the spraying is applied to a portion after the discharge port of the pressure container. A spraying device, characterized in that the main material has a merging portion for merging the cut reinforcing fibers and feeding the reinforced fibers to a pressure-feeding hose. 4. The feeding fiber cutting device according to claim 3, wherein the reinforcing fiber cutting device pulls out reinforcing fibers from the bobbin.
A spraying device comprising a la and a cutter roller having a cutter arranged in the circumferential direction. 5. The spraying device according to claim 3, wherein a pump is used instead of the pressure container as the pumping device for the spraying main material.