JPS6213656A - Concrete sprayer - 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 Technical Field The present invention relates to a concrete spraying machine in which pre-stirred concrete material is sprayed by compressed air in the spraying machine body via a conveying spraying member. Problem: The concrete spraying machine of the above type is well known and is used for spraying concrete onto tunnel walls and the like. This type of concrete spraying machine comes in wet and dry types, but either type can handle the concrete material,
It is desirable to stir the additive, water, etc. and mix them uniformly. For this reason, conventionally, concrete materials are mixed using a mixer or the like before being sent to the main body of the spraying machine.

However, conventional concrete spraying machines use a rubber hose or steel pipe with a circular cross section between the spraying machine body and the spray nozzle, and as a result, the air and concrete material are often separated into two parts.

As a result, a part of the viscous concrete material or fine sand crawled along the lower part of the pipe and fell downward from the spray port.

In order to solve this problem, a spraying machine has been proposed in which a vane plate is inserted into the pipe to re-stir concrete material, etc. within the conveying and spraying member.

However, the spraying machine configured in this manner has the problem that not only is there a large pressure loss of air, which places a burden on the compressor and the like, but also that the conveying and spraying member itself becomes extremely expensive.

Means for Solving the Problems The present invention solves the above problems by providing a torsion tube having a circular cross-sectional shape, at least two convex portions, and having a twist formed therein, and in which the torsion tube is connected to the conveying and spraying member. The problem was solved by the fact that it was used in at least some parts of the world.

Example Embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a spraying machine body, 2 a conveyance pipe, and 3 a nozzle. In this embodiment, the conveyance pipe 2 and the nozzle 3 constitute a conveyance spraying member. Further, the spraying machine main body 1 is of a wet type, and stirred fresh concrete IJ - (not shown) is blown out from the spraying machine main body 1 through a conveying pipe 2 and a nozzle 3 with compressed air.

The explanation up to this point is the same as the conventional one, but in this case, it was explained earlier that various problems would occur if the conveying and spraying member was a simple pipe. Therefore, the present invention takes the following measures for the conveying and spraying member.

In FIG. 1, in this example, a twisted pipe 4 is used over the entire length of the conveying pipe 2.As shown in FIG.
On the other hand, three convex portions 5, 6°7 are formed. In this case, the three convex portions 5.6.7 degrees have substantially the same shape and are formed into curved surfaces.

In addition, the twist pitch of the twisted pipe 4 is selected as appropriate based on the pipe diameter and other conditions. be done.

In the concrete IJ-to spraying machine configured in this way, when the fresh concrete passes through the torsion pipe 4, assuming that most of it is in the downward convex portion 5 in FIG. 2, these fresh concrete is conveyed along the convex portion 5. be done.

Then, due to the twist of the twisted tube, it moves upward, and then falls under its own weight and settles in another convex portion, and this operation is continuously repeated. Therefore, fresh concrete is given the above-mentioned stirring and mixing action just by passing through the twisted pipe.

- Thus, in the present invention, sufficient agitation and mixing of fresh concrete can be obtained simply by forming the shape of the tube itself as described above.

FIG. 3 shows another embodiment of the present invention, in which the twisted tube 4 is composed of twisted tubes 4a and 4b having different twist directions.

According to this configuration, the rotation of fresh concrete can be reversed, and stirring and mixing can be improved.

Further, in FIG. 4, a twisted tube 4 is used only for the nozzle 3. In this case, substantially the same effect as the embodiment shown in FIG. 1 can be obtained. Moreover, when a twisted pipe 4 is used as the nozzle 3 as shown in FIG. 4, the fresh concrete is sprayed while rotating, so that a rigid effect of increasing the spraying force can also be obtained.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified in various ways. For example, twisted tubes may be used for both the conveying pipe and the nozzle, or for only a portion of the conveying pipe and nozzle. Furthermore, the shape of the torsion tube is not limited to that shown in FIG. 2, but may have two or four protrusions 9 relative to the reference circle 8 as shown in FIGS. 5 and 6. In some cases, it may be more than one item.

Note that the present invention is not limited to wet type concrete spraying machines, but can also be applied to dry type and other types of spraying machines. were able to be sufficiently stirred and mixed.

Therefore, the air and the material are not divided into two and are mixed uniformly, so there is no local qualitative change in the material, no pulsation occurs, and the generation of dust is suppressed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of a twisted tube, FIG. 3 is a partial side view showing a modification of the twisted tube, and FIG. 4 is an illustration of another embodiment of the present invention. The explanatory drawings showing the embodiment, FIGS. 5 and 6, are sectional views showing modifications of the twisted pipe. 1... Spraying machine body 2... Conveying pipe 3...
・Nozzle 4...Screw 9 tube 5.6, 7.9
...Convex portion 8...Reference circle Figure 1 Figure 2 Figure 5 Procedure correction band November 12, 1985

Claims (3)

[Claims] (1) In a concrete spraying machine that sprays pre-stirred concrete material from the spraying machine body using compressed air via a conveying and spraying member, the cross-sectional shape has at least two convex portions relative to a standard circle, and is twisted. The concrete spraying machine is characterized in that it is provided with a twisted pipe in which a is formed, and the twisted pipe is used for at least a part of the conveying and spraying member. (2) The concrete spraying machine according to claim 1, wherein the conveying and spraying member is a conveying pipe, and the torsion pipe is used for the conveying pipe. (3) The conveyance spray member is a conveyance pipe and a nozzle attached to the tip of the conveyance pipe, and the twisted pipe is used for at least one of the conveyance pipe and the nozzle.
The concrete spraying machine according to claim 1.