JPH0233893Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides a mixing pipe that constitutes a part of a conveyance path for conveying concrete materials, and a part of a supply path that is connected to the mixing pipe and supplies a powder quick setting agent. The present invention relates to an quick-setting agent mixing device in a concrete spraying machine having a supply pipe comprising:

Prior Art and its Problems Accelerating agent mixing devices of the type described above are well known. This type of device is called a Y-tube because of its configuration, as shown in FIG. 3, a supply tube 21 is connected at an angle to a mixing tube 20.

In such a mixing device using a Y-tube, it is unavoidable that moisture from the concrete material passing through the mixing tube 20 enters the supply pipe 21, and as a result, the inner surface of the supply pipe 21, especially the connecting end portion indicated by reference numeral 22, is unavoidable. There were many cases where the powder quick-setting agent was stuck. Then, as the stickiness gradually increases with use over time, there is a problem in that it eventually blocks the supply pipe and interferes with concrete spraying.

Although such problems can be solved by periodically cleaning the Y-shaped tube, a new problem has arisen in that cleaning the Y-shaped tube by removing it from other tubes is too time-consuming. In the case of a concrete spraying machine that conveys fresh concrete material containing a large amount of water, this cleaning must be performed frequently.

Means for Solving the Problems The present invention solves the above problems by forming a tapered part in the end portion of the supply pipe connected to the mixing pipe so that the downstream side in the supply direction of the quick-setting agent has a smaller diameter, and This problem was solved by configuring at least the inner circumferential surface of the tapered portion to be a non-adhesive surface.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a conveyance path through which fresh concrete or dry concrete materials (not shown) are conveyed, and these concrete materials are air conveyed in the direction of arrow A by compressed air.

FIG. 1 shows, as a conveyance path 1, a part of concrete piping 2 consisting of a hose or the like extending from a supply section (not shown) that stirs and mixes concrete materials and supplies them in predetermined amounts. A mixing tube 3 and a part of a nozzle piping 4 having a nozzle (not shown) at its tip are shown, and these tubes are connected by suitable fixing means (not shown).

A supply path 5 is connected to the mixing tube 3 for supplying a powder quick-setting agent (not shown) from the direction of arrow B. The supply path 5 includes a supply pipe 6 that is directly connected to the mixing pipe 3, and a hose that is interposed between the supply pipe 6 and a supply section (not shown) that supplies a fixed amount of the quick-setting agent. It is composed of a chemical pipe 7.

In the mixing device according to the present invention, as shown in FIGS. 1 and 2, the supply pipe 6 has an outer tube 8 formed integrally with the mixing tube 3, and can be attached to and detached from the outer tube 8. The inner cylinder 9 is inserted into the inner cylinder 9.
In this case, an engaging convex portion 10 is formed on the outer periphery of the opposite end of the inner tube 9 to the side that is connected to the mixing tube 3, and an engaging convex portion 10 that engages with the engaging convex portion 10 is formed on the outer tube 8. 11
is formed (see Figure 2). Therefore, by removing the pipe 7 from the supply pipe 6, the inner cylinder 9 can be easily taken out as shown in FIG.

The inner cylinder 9 thus constructed is made of a material to which the powder quick setting agent does not easily adhere, such as polymeric plastic. Then, the tip side of the inner cylinder 9, that is, the mixing pipe 3
A tapered portion 12 is formed at the end portion connected to the spool 12 so that the downstream side in the quick-setting agent supply direction has a smaller diameter.

The operation mode of the quick-setting agent mixing device thus constructed is as follows.

When the concrete spraying machine starts spraying concrete, the supply section starts operating and the concrete material is being conveyed by air. In synchronization with the conveyance of this concrete material, the powder quick-setting agent moves to arrow B.
It is air conveyed by compressed air from the direction and mixed into the concrete material. If the concrete material is fresh concrete, it is directly sprayed through a nozzle onto a target area such as the inner wall of a tunnel, and if it is dry concrete, it is sprayed after water has been applied.

In this way, concrete is sprayed,
At this time, the supply pipe 6 has a tapered portion 12 in its inner cylinder 9.
, the flow path in that area is constricted and the flow speed increases. Therefore, it is difficult for the quick-setting agent to adhere to the
Furthermore, the penetration into the concrete material can be increased to improve mixing properties. Furthermore, since the inner cylinder 9 is made of a polymer plastic that is difficult to adhere to, the adhesion of the quick-setting agent can also be suppressed from this point of view.

In this way, since the adhesion of the quick-setting agent on the supply pipe 6 is significantly reduced, the number of times the supply pipe 6 needs to be cleaned is drastically reduced. Furthermore, even if cleaning is required after long-term use, by removing the quick-setting agent pipe 7 as shown in Figure 2, only the inner cylinder 9 necessary for cleaning can be taken out. It is simple and the cleaning efficiency is greatly improved.

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, the supply pipe 6 is composed of an outer tube 8 and an inner tube 9 made of hard-to-stick polymeric plastic, but the inner surface of the outer tube 8 is processed by attaching plastic, etc., so that the outer tube 8 is directly made into a hard-to-stick surface. It's okay. Furthermore, although it is advantageous to use polymeric plastic as the hard-to-stick surface, it may also be formed using other materials and processing of the surface.

Effects The quick-setting agent mixing device according to the present invention is configured as described above, and the adhesion of the quick-setting agent to the supply pipe is significantly reduced, and the number of times of cleaning is drastically reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention;
The figure is a sectional view showing the state in which the inner cylinder of Fig. 1 is removed.
FIG. 3 is a sectional view showing a conventional mixing device. 1... Conveyance path, 3... Mixing pipe, 5... Supply path,
6... Supply pipe, 8... Outer pipe, 9... Inner cylinder, 12...
...Tapered part.

Claims (1)

[Claims for Utility Model Registration] (1) A mixing pipe that forms part of a conveyance path for conveying concrete materials, and a part of a supply path that is connected to the mixing pipe and supplies a powder quick-setting agent. In the quick-setting agent mixing device for a concrete spraying machine, the supply pipe includes a tapered portion having a smaller diameter on the downstream side in the quick-setting agent supply direction at an end portion of the supply pipe connected to the mixing pipe;
The quick binding mixing device is characterized in that at least the inner circumferential surface of the tapered portion of the supply pipe is configured to have a hard-to-adhesion surface. (2) Claim 1 of the Utility Model Registration Claim characterized in that the tapered portion is formed in an inner cylinder made of a non-adhesive polymer plastic that is removably inserted into the outer pipe of the supply pipe. Rapid setting agent mixing device.