JPS6338288Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to valves for tremie pipes (underwater concreting pipes) and similar construction pipes (hereinafter simply referred to as tremie pipes), and is particularly applicable to pressure fluids. By expanding and adhering to the inside of the pipe,
A bag-shaped valve designed to close the tremie tubing or open the tremie tubing by removing the pressure fluid, is suspended in the tremie tubing, and the part that rises due to the suspension By connecting the tremie pipe and the lower part with a cable that is stretched vertically inside the bag, it is prevented from being stretched and deformed vertically due to the weight of fluid such as concrete flowing inside the tremie pipes.
This prevents the degree of close contact between the inner peripheral surface of the tremie tube and the valve from being impaired.

PRIOR ART

Conventional tremie pipes used for underwater concrete placement also use bag-shaped valves that expand due to the force of the fluid and come into close contact with the inner circumferential surface of the tremie pipe to stop concrete from flowing down. Yes (Japanese Unexamined Patent Publication No. 140307/1983).

However, since the valve itself is in the shape of a soft bag, the pressure and heavy weight of a large amount of concrete flowing down inside the pipe at high speed causes the valve to extend in the pipe axis direction, causing the valve surface and inner circumferential surface to The degree of close contact with the valve was impaired, and the closing effect of the valve was adversely affected.

[Problem that the invention attempts to solve]

This idea was developed to solve the above-mentioned problem; that is, due to the pressure and heavy weight of a large amount of concrete flowing down inside the pipe at high speed, the valve stretches in the direction of the pipe axis, reducing the degree of contact between the valve surface and the inner circumferential surface of the pipe. It aims to solve the problem of damage and adversely affecting the closing effect of the valve.

[Means for solving problems]

For example, as shown in the illustrated embodiment, the bag 7, which is made of a flexible membrane material and can be expanded and contracted, is suspended from hanging rods 9 and 10 installed horizontally in the tremie tube 1. the bag and the pressure source 12
In this type 1 tremie valve, the valve is configured to be able to close the inside of the pipe by supplying pressure fluid to the bag 7 and expanding it by connecting a hose 13 between the bag 7 and the bag 7. This relates to a valve for tremie pipes, characterized in that the upper part and the lower part are connected by a cable 15 that is vertically stretched within a bag 7.

[Effect]

By connecting the upper part and the lower part of the bag that makes up the valve with a cable strung vertically inside the bag, concrete can flow through the tremie pipes. To prevent a bag from being vertically elongated and deformed due to the weight of the fluid, thereby preventing damage to the degree of close contact between the inner circumferential surface of a tremie tube and a valve.

〔Example〕

FIG. 1 shows a longitudinal sectional view of the tremie tube, and FIG. 2 shows details of its valve portion. The tremie pipe 1 has a plurality of steel pipes 2 sequentially connected in the vertical direction at each flange 3 to form a downstream pipe, a funnel-shaped concrete receiving port 4 is connected to the top end, and a funnel-shaped concrete receiving port 4 is connected to the bottom end. , a valve section 5 according to this invention is connected. The joint portion formed by each flange 3 forms a watertight joint.

As shown in an enlarged view in FIG. 2, the valve portion 5 is
A ball bag 7 is provided in a short steel tube 6 having the same diameter as the intermediate portion of the tremie tube 1. The short pipe 6 is connected upwardly at a flange 3 in its upper edge, and its lower end is open to form a concrete outlet 8 .

Near the upper and lower ends of the short tube 6, a pair of intermediate portions 9 and 10 are fixedly installed across the tube. The ball bag 7 is located between them, and its upper and lower ends are connected to and supported by hanging rods 9 and 10, respectively, via a chain or a rope 11. The bulbous bag 7 is a bag made of a flexible membrane material, and a hose 13 is connected between the upper part thereof and the pressure source 12 shown in FIG.

This pressure source 12 is a compressor, and therefore the pressure fluid used here is air. The thin film constituting the bulb bag 7 is made of a material having elasticity and wear resistance, such as rubber, nylon, urethane, polyethylene, etc., and its shape is easily approximately spherical or oval. Since the bulbous bag 7 expands and contracts depending on the degree of fluid pressure received from the pressure source 12, it is preferable to provide a fold 19 around the bulbous bag 7 to facilitate expansion and contraction.

Moreover, the structure of the ball bag 7 is as shown in FIG.
A dish-shaped plate 14 is attached to the upper part and the lower part when suspended from the hanging rods 9 and 10 by the rope 11.
It is desirable to reinforce it by applying it from the outside. Furthermore,
Inside the bulbous bag 7, the upper part and the lower part are connected by a cable 15 such as a rope or chain. As a result, the length of the bulbous bag 7 in the axial direction of the tremie tube 1 is restricted, and expansion in the axial direction is prevented.

In addition, when attaching the hose 13 to the ball bag 7,
It is desirable to connect it to one of the plate plates 14.

The other end of the high pressure hose 13 is connected to the pressure source 12, as shown in FIG. As mentioned above, the structure of the pressure source 12 is a compressor, which includes an air compressor 16, an attached pressure tank 17, and a switching valve 18. Switching valve 18
operates this to adjust the amount of air supplied.

In this example, the concrete flow pipe of the tremie pipe 1 is formed of the steel pipe 2, but it is not necessarily limited to steel pipe, and may be made of a non-metallic material such as rubber, vinyl, nylon, etc., and also a flexible material. A tube can also be used.

Next, the construction of underwater concrete placement using the valve of this invention will be explained.

First, when assembling the tremie pipe 1 and installing it at the concrete pouring site, air is supplied to the bulbous bag 7 in the valve part 5 to expand it, as shown in FIG. By contacting the inner wall surface, the discharge port 8 is closed. Thereafter, a certain amount of fresh concrete is supplied from the concrete receiving port 4 and stored in the tremie pipe 1, and the tremie pipe 1 is lowered to a predetermined water depth.

Furthermore, as shown in FIG. 4, the ball bag 7 is contracted under reduced pressure to separate the ball bag 7 from the inner wall surface of the short pipe 6, causing the concrete to flow down from the discharge port 8 and from the receiving port 4. Repeat the operation of pouring fresh concrete.

Once the concrete has been poured, the ball bag 7 is expanded again, the discharge port 8 is closed, the tremie tube 1 is pulled up, moved and installed at another location, and the above operations are repeated until the underwater concrete is poured. Pour concrete.

In the figure, 20 is water, 21 is fresh concrete stored in the tremie pipe 1, 22 is poured underwater concrete, and 23 is the bottom surface of the concrete.

In addition, by operating the switching valve 18 of the pressure source 12 to adjust the amount of air supplied and adjusting the degree of expansion and contraction of the ball bag 7, concrete can be placed while controlling and suppressing the amount of concrete flowing down. .

In this embodiment, the tremie tube 1 was described as being used for placing concrete underwater, but the tremie tube of the same structure can be applied to remove sludge accumulated in water or to remove excess concrete that has been over-placed. You can also.

〔effect〕

A ball bag valve having such a structure has cable 1
5 restricts and inhibits the tremie tube from extending in the axial direction, so that the tremie tube does not extend in the axial direction due to the pressure of concrete or the like. Therefore, the degree of close contact between the bulb bag and the inner circumferential surface of the tremie tube can be ensured, and a quick and reliable valve closing effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the tremie pipe, FIG. 2 is an enlarged view of the valve portion in FIG. 1, and FIGS. 3 and 4 are diagrams for explaining underwater concrete placement work. In the figure, 1 is a tremie tube, 7 is a bulbous bag, 9 and 10 are suspension rods, 12 is a pressure source, 13 is a hose, and 15 is a rope.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An expandable and deflated bag made of a flexible membrane material is provided suspended from a suspension rod installed horizontally within tremie tubing, and between the bag and a pressure source. In a valve for tremie tubing configured to be able to close the inside of a pipe by connecting a hose and supplying pressure fluid to a bag to expand it, the bag is suspended and has a part above it and a part below it. A valve for tremie tubing, characterized in that the valves are connected by a cable that is stretched vertically within the bag. (2) The tremie tubing valve according to claim 1, wherein the bag has a substantially spherical or oval shape.