JPH04127358U - concrete pressure pipe - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to check the internal wear of the pipe body from the outside, determine the appropriate time to replace it before it breaks, and facilitate safety and management. [Structure] A minute weakened hole 21 is cut out from the outside at a part of the outer periphery of the pipe body where a large load of concrete to be pumped is applied, without communicating with the inside of the pipe. The concrete being pumped gradually wears away the passage surface of the pipe,
First, fluid cement leaks out of the pipe from the weakened hole 21, and at this point the pipe is replaced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a boom pipe that pumps fresh concrete for concrete pouring. This relates to concrete pressure pipes.

0002

[Conventional technology]

Conventional concrete pressure pipes are formed by extrusion molding of various steel materials, and The end flanges may be interconnected to the driving part, or as shown in Figure 6, the bush may be It is connected to a concrete pump vehicle as a beam pipe 1.

0003 However, the inner circumferential surface is abraded by gravel aggregate, etc., which is forced through by pump pressure, etc. This was dangerous as the pipe body could crack and break. For this reason, the concrete pressure pipe is enlarged. They replaced it early due to the amount of time the body was used. Therefore, it can withstand sufficient use. It is uneconomical to discard the pipe body, and on the other hand, if the replacement period is missed, cracks may occur. It was difficult to maintain and manage the concrete because it was dangerous because it would scatter.

0004

[Problem that the idea aims to solve]

The problem that this invention aims to solve is that the internal wear of the pipe body can be checked from the outside and The goal is to make it possible to determine the correct timing for replacement, and to develop a system that is both safe and economical. This provides a cleated pressure feed pipe.

[0005]

[Means to solve the problem]

For this reason, the present invention was developed using a boot that pumps fresh concrete for concrete pouring. Concrete pressure conveyance pipes such as pump pipes, and the load of the concrete to be conveyed is large. A small weakened hole is cut from the outside at a part of the outer circumference without communicating with the inside of the pipe. The structure is as follows. In addition, the weak hole has a diameter of 1 to 3 mm and protrudes to a depth of approximately half the pipe thickness. It is best to do so.

[0006]

[Effect]

The concrete being pumped gradually wears away the passage surface inside the pipe, and When the wear reaches the weakened hole in the area, fluid cement leaks out of the pipe body from the weakened hole. It is. This leakage is safe because there is no risk of it blowing out because the weakened hole is minute. Yes, the pipe body should be replaced at this point.

[0007]

【Example】

Hereinafter, illustrated embodiments of the present invention will be described. In the example shown in Figure 1, 2 is It is a concrete pressure pipe with flanges protruding from both ends, and the wall thickness of the pipe body is 3 to 4 mm. It is. Then, a small weak hole 2 is formed on a part of its outer circumference without communicating with the inside of the pipe. 1 is missing from the outside, and the diameter of the weakened hole 21 is 2 mm and the depth is is 1.5 to 2 mm.

[0008] As shown in FIG. They are connected to form a pressure-feeding pipeline. As a result, as shown in Figure 3, concrete, especially gravel 31, gradually wears away from its contact passing surface. When the wear reaches the weak hole 21, as shown in Fig. 4, fluidity is released from the weak hole 21. The cement 32 leaks out of the tube. At this point, half of the wall thickness is worn out. Therefore, it is time to replace the pipe body. This leakage is due to the weak hole 21 being minute. Since solid materials such as gravel cannot pass through, there is no danger of blowouts and it is safe.

[0009] In this way, according to this example, leakage first occurs from the weak hole 21, which is the weak part. By looking at the leakage, you can judge the wear condition and decide when to replace it. Since accurate judgment can be made, management becomes easier and safety can be ensured. Ru. Note that the surface of the tube body is often painted, and in this case, the paint may not penetrate into the weakened hole 21. It enters and hardens, but is removed when the cement 32 is squeezed out from the weakened hole 21. There is no problem because the

0010 Although this example is configured as described above, the present invention is not limited to this. example For example, the location and number of weak holes are appropriate, but the load of the concrete to be pumped is large. It is necessary to place it in such a position. In addition, the size and depth of the weakened hole are limited. do not have. Further, the shape of the weakened hole may be arbitrary, and may be cut out as shown in FIG. In addition The material and wall thickness of the concrete pressure pipe do not matter.

[0011]

[Effect of the idea]

According to this invention, leakage from the weak hole, which is the weakest part, is first checked. This makes it possible to judge its wear condition and determine the time for replacement by visual inspection. It is easy to manage and has a great effect in ensuring safety.

0012 According to claim 2, there is less leakage from the weakened hole and further safety can be ensured. It is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an example of the present invention in use.

FIG. 2 is a side view showing the connected state.

FIG. 3 is an enlarged sectional view of the main part in a state where the inside of the tube is slightly worn.

FIG. 4 is an enlarged sectional view of a main part showing a state of leakage from a weakened hole.

FIG. 5 is an enlarged sectional view of a main part of another example.

FIG. 6 is a schematic side view of a concrete pump truck with a boom tube.

[Explanation of symbols]

2 concrete pressure pipe, 21 Weak hole, 31 Gravel, 32 Cement.

Claims (2)

[Scope of utility model registration request] [Claim 1] A concrete pressure-feeding pipe such as a boom pipe that pumps fresh concrete for concrete placement, with a minute weakened hole communicating with the inside of the pipe at a part of the outer periphery where a large load of the concrete to be pumped is applied. This concrete pressure pipe is characterized by being cut out from the outside without causing damage. 2. The concrete pressure pipe according to claim 1, wherein the weakened hole has a diameter of 1 to 3 mm and a depth of approximately half the thickness of the pipe.