JPS5936283Y2 - Water adding device in concrete spraying machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a water adding device in a concrete spraying machine which is employed in a concrete spraying method.

In general, spraying is roughly divided into two types in concrete construction methods: wet and dry.In the first method, all materials such as cement, water, and aggregate are wet-mixed in advance and the raw mixed material is pumped in a dense flow state. This method is used to forcefully feed concrete into conduits such as pipes and hoses, and tip spraying is sprayed onto the work surface from a nozzle, making it easy to control the blending and mixing of cement, etc., and not only can produce homogeneous and good concrete, but it also generates less dust. Although it has the advantage of being small in quantity, the frictional resistance within the pressure-feeding pipeline is large and a powerful pumping force is required, which necessitates that the pipeline and other equipment also have sufficient pressure resistance. In addition to the unavoidable increase in size, there are also restrictions on the size and shape of the aggregate, and in particular, the transportation distance is limited to a short distance, making it difficult to apply to various construction sites.

On the other hand, in the above-mentioned dry method 1, the concrete material, which is a dry mix of cement, aggregate, etc., is transported in a diluted flow state through the pipe using high-pressure air, and pressurized water is added from a separate hose at the end of the pipe. Since tip spraying involves spraying onto the work surface from a nozzle, the frictional resistance in the pressure feed pipeline is smaller than in the wet method 1 above, and a large pressure reduction can be achieved, simplifying and downsizing equipment. It can be applied to various construction sites as it is easy to use, and the transport distance can be extended to a large extent.
However, the dry mixed concrete material transported through the pipes and the pressurized water from a separate hose cannot be mixed sufficiently, making quality control difficult and ensuring that the concrete is homogeneous and good.
In addition to not being able to obtain I., there were problems in that the amount of dust generated and the amount of dust bouncing were large.

In other words, in the dry concrete spraying method, a water ring with many small holes on the inner circumferential surface is installed in the middle of the conduit or at the nozzle part, and pressurized water is supplied to this from a separate hose. This is because pressurized water is simply injected into the transported dry mix concrete material through the small holes of the water ring without being diffused in the form of a spray. It is difficult to obtain a homogeneous mixture due to the formation of low and low spots, making it difficult to obtain high-quality concrete.In addition, spraying generates a lot of dust and splashes during spraying.

This idea was devised in view of the above circumstances; spraying takes advantage of the advantages of the first dry method in concrete construction methods, such as the ease of transporting concrete material through pressure-feeding pipes, and also allows concrete to be sent in a dry mix state. Dry concrete spraying is a machine that can easily and reliably obtain homogeneous concrete by adding pressurized water to the material in a spray state, and also reduces dust generation and splashing during spraying. The purpose is to provide a water adding device that can greatly contribute to the

In other words, in this invention, a flange portion with a plurality of spray nozzle mounting ports is provided at the tip of the nozzle attachment pipe through which concrete material in a dry mix state is transported through the pipeline, and at the tip of the nozzle attachment tube, A metal outer cylinder whose rear end has a larger diameter than the nozzle mounting pipe and whose diameter gradually decreases toward the nozzle, and a non-adhesive and wear-resistant material such as synthetic rubber arranged with a small gap inside this cylinder. A tapered pipe with a double-walled structure consisting of a non-metallic inner cylinder with a The spray nozzle is fitted with a nozzle, and each of the spray nozzles is oriented at an angle so as to diffuse and spray pressurized water obliquely from the rear end toward the tip inside the tapered tube. It is something.

An embodiment of this invention will be described below with reference to the drawings. In the drawing, 1 is a pipe through which concrete material, which is a dry mix of cement and various aggregates, is transported in a dilute state using high-pressure air.
This is constructed by connecting a hose or pipe, and has a spray nozzle 2 made of a PVC pipe or the like at the tip.

Here, the water adding device 3 of this invention is connected to the middle of the pipe 1, that is, just before the nozzle 2, at the tip end.

This water adding device 3 sprays pressurized water from a separate hose 4 installed in parallel with the pipe 1 to a nozzle 2 at the tip of the pipe 1.
It is added to and mixed with the concrete material in a dry mix state in front of the pipe, and includes a steel pipe nozzle attachment pipe 5 connected to the tip of the pipe line 1, and a tapered pipe 6 connected to the tip of the nozzle attachment tube 5. The spray nozzle 2 is connected to the tip of the tapered pipe 6.

More specifically, the nozzle mounting pipe 5 has a large-diameter flange-like flange 7 integrally at its tip, and the flange 7 has a plurality of circumferentially spaced flange portions, for example, four circumferentially spaced flange portions. Spray nozzle mounting lower a... are formed respectively.

Each nozzle mounting lower a... passes through from the rear side to the front side of the flange portion 7, and is formed toward the central axis O of the conduit 1 with an inclination angle θ of approximately 30 degrees. There is.

On the other hand, the tapered pipe 6 has a double-walled structure, with the diameter of the rear end connected to the tip of the nozzle mounting pipe 5 being larger than that of the nozzle mounting pipe 5, and the diameter of the tip spraying gradually decreasing toward the nozzle 2. The outer cylinder 8 is made of a metal such as cast iron, and the inner cylinder 9 is made of a non-metal such as synthetic rubber that has excellent non-stick properties and wear resistance.

Note that 10 in the figure is a screw 11 attached to the rear end flange of the inner cylinder 9.
. . . is used to seal the circumferential surface of the connecting portion between the nozzle mounting pipe 5 and the tapered pipe 6 with the gasket that is joined and fastened.

Here, each spray nozzle attachment lower a of the flange portion 7 of the nozzle attachment pipe 5 has a spray nozzle 12 connected to a separate hose 4 for supplying pressure water.
are fitted in such a way that they are screwed in one by one.

Each of these spray nozzles 12 is already commercially available, and consists of a main body, a spiral element, a nozzle tip, etc., and sprays pressurized water into fine particles under high pressure, each spraying at an individual spray angle. β is about 60 degrees.

In addition, each of these spray nozzles 12..., like each of the above-mentioned mounting lower a... It is tilted so as to spray pressurized water approximately at the center of the inner cylinder 9 of the tapered pipe 6 (in one direction).

To describe the operation of the above-mentioned configuration, first, concrete material in a dry mix state is transported to the pipe line 1 of the machine, passes through the nozzle attachment pipe 5 of the water adding device 3, and is then poured into the tapered pipe 6. The water is sent into the tube 9, where it receives the addition of pressurized water that is injected separately from the hose 4 through each spray nozzle 12, and is further sent to the tip, where it is sprayed from the nozzle 2 to the sprayed object. Can be sprayed onto surfaces.

Here, each of the above-mentioned spray nozzles 12 . By diffusing and spraying the concrete material in the dry mix state sent into the inner pipe 8 of the tapered pipe 6, the fine water particles are mixed evenly and uniformly over the entire area, and the diameter gradually becomes smaller. Mixing of concrete material progresses in the process toward the tip of the tapered pipe 6, and the concrete sprayed from the nozzle 2 at the tip becomes homogeneous and good, and the generation of dust and the amount of splashing are extremely reduced.

Furthermore, the concrete material becomes viscous due to water addition and mixing from the spray nozzle 12, which increases the frictional resistance inside the pipe. This increases the frictional resistance and allows for smoother feeding.

In addition, the non-adhesive inner cylinder 9 has high abrasion resistance and can withstand long-term use, and is made of elastic material such as synthetic rubber and has a small gap with the outer cylinder 8 to prevent vibrations. can occur,
This also makes it possible to further promote the mixing and mixing of water into the concrete material.

This idea was developed as detailed above, so spraying takes advantage of the dry method in concrete construction methods, such as the ease of transporting concrete materials through pressure pipelines, and also uses concrete that is sent in a dry mix state. Pressure water can be added and mixed well in a spray state.

Therefore, dry concrete spraying is a very effective water adding device for machines, as homogeneous and good quality concrete can be easily and reliably obtained, and dust generation and splashing can be reduced during spraying.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part showing an embodiment of this invention. 1...Pipe line, 2...Nozzle for spraying, 3
...... Water adding device, 4... Separate hose, 5
...Nozzle mounting pipe, 6...Tapered pipe, 7...Flange section, 7a...Spray nozzle mounting port, 8...Outer cylinder, 9 ...Inner cylinder, 1゜...Packskin, 11...Screw, 12.
...Spray nozzle.

Claims (1)

[Scope of utility model registration request] Concrete spraying involves transporting concrete material, which is a dry mix of cement and aggregate, through a pipe in a dilute flow state, adding pressurized water from a separate hose along the way, and spraying the concrete material from a nozzle onto the work surface. In a water adding device in a machine, there is a nozzle attachment pipe that is interposed in a pipe through which concrete material is transported and has a flange portion at the tip of which a plurality of spray nozzles are installed [ ], and a nozzle attachment pipe that is connected to the tip of the nozzle attachment pipe and that A metal outer cylinder whose end has a larger diameter than the nozzle mounting pipe and whose diameter gradually decreases toward the nozzle, and a non-adhesive and abrasion-resistant material such as synthetic rubber placed inside this with a small gap. The tapered pipe has a double wall structure consisting of a non-metallic inner cylinder, and is connected to a separate hose to which pressurized water is supplied, and is fitted into each nozzle mounting port of the tip flange of the nozzle mounting pipe, thereby achieving the above-mentioned respective properties. A water adding device in a concrete spraying machine characterized by a plurality of spray nozzles arranged at an angle to diffuse and spray pressurized water diagonally from the rear end to the tip of the central force inside the tapered pipe.