JPH02176276A - valve - 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 [Field of Industrial Application] The present invention mainly relates to a valve suitable for use by being attached to the tip of an underwater concrete pouring pipe.

[Conventional technology]

Concrete is placed underwater using tremie pipes.

When pouring concrete, the tip of this tremie tube is inserted into the concrete that has already been poured to prevent the concrete from separating in the water, and after pouring, the tip is separated from the poured concrete. It is then moved to the next pouring location, but a valve is attached to the tip to prevent concrete from flowing out from the tip.

As shown in Fig. 7, such a valve has conventionally been constructed by installing a rubber sleeve inside a spherical casing (a) which has short cylindrical parts (b) integrally connected to the upper and lower small-diameter opening ends. A cylindrical valve body (C) is disposed, and the upper and lower ends of the valve body (C) are respectively fixed to the open end joint side of the upper and lower short cylindrical parts (5) (b), and the valve body ( compressing and deforming the valve body (e) inward by supplying pressurized air from the outside through the air hose (f) into the space (e) between the outer peripheral surface of C) and the inner peripheral surface of the casing (a); The structure is designed to block concrete and prevent concrete from flowing out.

[Problems to be solved by the invention] However, according to the valve having such a structure, when the pressure in the space (e) is brought to atmospheric pressure and the valve body (C) is opened during concrete pouring, As shown in the figure, the valve body (C) bulges and deforms in the outer diameter direction, that is, into the space (e) due to the water pressure in the water or the concrete pressure flowing out, and the upper and lower ends of the casing (a) and the above-mentioned Small diameter short cylinder part (b)
The valve body (C) is bent at the corner where it connects with (b), and the concrete flows out while strongly rubbing against the inner surface of the bent part, and this part is worn out due to the large friction with the concrete. However, it could become damaged in a short period of time.

Furthermore, there is a problem in that the valve body (C) expands and contracts in the expanded state toward the space (e) due to the concrete flowing out in a pulsating manner due to pump pressure feeding, which accelerates fatigue and significantly reduces durability. Ta.

The present invention provides a valve aimed at completely solving these problems.

[Means to solve the problem]

In order to achieve the above object, the valve of the present invention has a cylindrical valve body with expandable and contractible diameter smaller than that of the casing inserted into a casing which has short cylindrical parts integrally connected to the upper and lower small diameter opening ends. The upper and lower ends of the upper and lower ends are respectively fixed to the open end joint side of the upper and lower short cylindrical parts, and an elastic cushioning material is interposed in the space between the outer circumferential surface of the valve body and the inner circumferential surface of the casing. The outer circumferential surface of the valve body is received by the inner circumferential surface of the material, and a boat is further provided that penetrates the buffer material from the outer circumferential surface of the casing and supplies fluid between the valve body and the buffer material. It is something to do.

In the above valve, it is preferable that an annular circumferential groove is provided in the center of the inner circumferential surface of the cushioning material over the entire circumference, and that the boat is communicated with a suitable position of this annular circumferential groove. A vertical groove may be provided on both sides over the entire length, the center portion of which is in communication with the annular circumferential groove.

[For production]

When the above-mentioned valve is attached to the tip of a tremie pipe for placing underwater concrete, and the valve body is opened during concrete pouring underwater, the cylindrical valve body expands the diameter of the casing due to water pressure or outflowing concrete pressure. Although the valve body tries to expand inward, the outer circumferential surface of the valve body is received by the cushioning material having a vertical cylindrical surface, and the expansion in the outer radial direction is prevented, without creating a bent part at the upper and lower fixed ends. It maintains a cylindrical shape over the entire length, allowing concrete to flow out smoothly and eliminating excessive concrete pressure acting on the valve body.

Furthermore, since the buffer material has elasticity, it can absorb the fluctuating pressure of the concrete flowing out in a pulsating manner due to pump pressure, thereby suppressing fatigue of the valve body.

Furthermore, when closing the valve body, when pressure fluid is supplied into the casing through the boat, the pressure fluid flows into the annular circumferential groove provided all around the center of the inner peripheral surface of the buffer material, and the valve body is closed. By intensively pressing around the center of the body, the valve body is easily and reliably contracted from the center and closed in a predetermined closed shape.

In this case, if longitudinal grooves are provided on both sides of the inner circumferential surface of the cushioning material over the entire length, the center portion of the length direction communicating with the annular circumferential groove, both sides of the valve body can be placed in the reservoir grooves. The opposite surfaces of the valve body are surely deformed and press-contacted with each other by using both sides thereof as fulcrums to ensure -N reliable closing.

(Embodiment) To explain the embodiment of the present invention with reference to the drawings, (1) is a metal spherical casing, and the upper and lower opening ends communicating on the coaxial line have a short diameter smaller than that of the casing (1). The cylindrical portions (2) and (3) are integrally formed, and the ends of these short cylindrical portions (2) and (3) are provided with joint flange portions (4) and (5) extending in the outer diameter direction, respectively. It is integrally formed.

(6) is a cylindrical valve body with elasticity such as a rubber sleeve, which is molded from a rubber material with an appropriate thickness and has reinforcing fibers inside; It is formed to have the same inner diameter as the cylindrical portions (2) and (3), and the upper and lower ends are inserted into these upper and lower short cylindrical portions (2) and (3).

(7) is a cushioning material arranged in the space between the spherical inner surface of the casing (1) and the outer peripheral surface of the valve body (6), and is made of an elastic material such as epoxy resin, and the inner peripheral surface of the valve body It is formed into a cylindrical surface (7a) having the same shape as the outer peripheral surface of (6).

The method for forming the buffer material (7) includes inserting and fixing a cylindrical mold having the same outer diameter as the valve body (6) into the casing (1) before disposing the valve body (6). The formwork and casing (1
) can be formed by filling the space between them with resin, curing it, and then removing the mold.

(8) is an annular circumferential groove carved all the way around the center of the cylindrical surface (7a) of this cushioning material (7). Airport (9)
This is to communicate.

GO) GO) is a ring-shaped holding fitting that fixes the upper and lower ends of the valve body (6), and the tapered surface (10a) formed on the outer circumference tapered surface (10a) and the opening end surface of the upper and lower joint flange portions (4) (5). 4a) (5a) The upper and lower ends of the valve body (6) are held in an expanded state between them, and the flange body (I 1)
These flange bodies (II) (II) are connected to the upper and lower joint flange parts (4), respectively, while the inner peripheral surfaces of (ll) are engaged with each other.
The upper and lower ends of the valve body (6) are fixed by fastening to (5) with bolts and nuts.

For example, as shown in Fig. 6, the operation of the valve configured as described above (pinch valve) is as follows: Explain.

When pouring concrete, the tip of the tremie pipe θ3) is inserted into the concrete that has already been placed inside the footing formwork to prevent the concrete from separating in the water, and in this state, the valve body (6) is opened. to allow the concrete to flow out.

Opening of the valve body (6) is performed by connecting a pressure air supply source (not shown) installed in the plant ship (05) and the air boat (9) of the valve.
), the inside of the casing (1) is brought to atmospheric pressure through the air hose (16) connected between the valve body (
6) has its outer peripheral surface brought into close contact with the cylindrical surface (7a) of the buffer material (7) due to water pressure or concrete pressure, and the tremie tube 0
The inner peripheral surface of 3) and the inner peripheral surface of the valve body (6) are flush and continuous, allowing concrete to flow out smoothly.

Furthermore, the concrete flows out in a pulsating manner due to pump pressure feeding, and the fluctuating pressure acts on the valve body (6).
) absorbs the fluctuating pressure and prevents excessive concrete pressure from acting on the valve body (6).

Next, once the concrete has been poured into the footing form, the tip of the tremie pipe 03) is removed from the top of the poured concrete and moved to the next concrete placement position. (6) Close.

The valve body (6) is closed when the pressure fluid is supplied to the boat (9) through an air hose 0Ω, and the pressure fluid flows through the annular circumferential groove (8) provided all around the center of the inner circumferential surface of the buffer material (7). ), and the outer circumferential surface of the central portion of the valve body facing the annular circumferential groove (8) is first intensively pressed to deform the valve body from the central portion in the radial direction.

This deformation of the valve body (6) does not result in a reduction in diameter, but in the third
As shown in the figure, the 120° arcuate portion curves inward and its inner circumferential surface closely contacts and closes in a Y-shape.

That is, the valve body (6) has a constant circumferential length, and the pressure applied to the outer circumferential surface causes the valve body itself to bend inwardly and deform more easily than to compress in the circumferential direction. In some cases, the entire circumference is deformed so that it is divided into a plurality of curved parts of the same shape, but at that time, the deformation is performed so that the shape has the smallest number of curved parts.

In this way, with the valve body (6) closed, the tremie tube 0
(2) is moved to the next concrete placement site and concrete is placed again in the same manner as described above.

Next, Figure 4.5 shows another embodiment of the present invention,
In the valve according to the embodiment, vertical grooves 07) having a semicircular cross section are carved along the entire length on both sides of the inner circumferential surface of the buffer material (7), facing each other in the diametrical direction. 0η
The central portion in the longitudinal direction is communicated with the annular circumferential groove (8), and the other structure is the same as that of the previous embodiment.

By providing the vertical groove surface QTI with a semicircular cross section over the entire length on both sides of the inner peripheral surface of the buffer material (7), pressurized air can be forced into the annular circumferential groove (8) through the port (9). and,
Due to the pressing force of the pressurized air, the part of the valve body (6) facing the vertical groove (+7) (lη is guided into the vertical groove aη0'?) and is bent and fitted into the vertical groove (+7).
6a) From (6a), the facing surface of the valve body (6) is curved and deformed into an S-shape by air pressure and comes into close contact with the entire surface, making it possible to completely close the valve body.

In addition, in the above embodiment, the valve casing (
Although a spherical valve is shown as the shape of item 1), spindle shapes and other shapes do not pose any problem in implementing the present invention, and examples of the use of this valve include concrete in water. Although the explanation has been made regarding the installation of the pipe, it is of course possible to use it by attaching it to other fluid transport pipes.

Further, although pressurized air is used to open and close the valve body (6), water or other pressurized fluid may also be used.

〔Effect of the invention〕

As described above, according to the valve of the present invention, a cylindrical valve body having expandability and a diameter smaller than that of the casing is inserted into the casing, which has short cylindrical parts integrally connected to the upper and lower small-diameter opening ends. The upper and lower ends thereof are respectively fixed to the open end joint side of the upper and lower short cylindrical parts, and an elastic cushioning material is interposed in the space between the outer peripheral surface of the valve body and the inner peripheral surface of the casing. The outer peripheral surface of the valve body is received by the inner peripheral surface of the casing, and a boat is provided which penetrates the buffer material from the outer peripheral surface of the casing and supplies fluid between the valve body and the buffer material. When the valve body is opened to allow a fluid such as concrete to flow out, the outer peripheral surface of the cylindrical valve body, which is about to expand in the diameter direction due to the pressure from the fluid, is received by a buffer material having a vertical cylindrical surface. Therefore, it is possible to reliably prevent the valve body from expanding in the outer radial direction, and it can be held in a cylindrical shape over its entire length without creating bends at its upper and lower fixed ends. Therefore, concrete can be smoothly flowed out, and excessive concrete pressure can be prevented from acting on the valve body, so that it can be used for a long period of time.

Furthermore, since the buffer material has elasticity, the fluctuating pressure of the fluid flowing out in a pulsating manner due to pump pressure can be absorbed into the buffer material via the valve body, thereby suppressing fatigue of the valve body. be.

Furthermore, when closing the valve body, when pressure fluid is supplied into the casing through the boat, the pressure fluid flows into the annular circumferential groove provided all around the center of the inner peripheral surface of the buffer material, and the valve body is closed. By intensively pressing the area around the center of the body, the valve body can be easily and reliably contracted from the center and closed in a predetermined closing shape. By providing a vertical groove over the entire length, the central part of which is in communication with the annular circumferential groove, both sides of the valve body fit into the vertical groove, and the valve body is supported using the both sides as fulcrums. The opposing surfaces of the two are reliably deformed and press-contacted, allowing for even more reliable closure.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention.
The figure is a longitudinal sectional front view, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a cross-sectional view with the valve body closed, FIG. 4 is a cross-sectional view showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view showing the valve in its closed state, FIG. 6 is a simplified front view of the valve in use for underwater concrete placement, and FIG. 7 is a longitudinal sectional front view of the conventional valve. (1)...Casing, (2)(3)...Short tube part,
(6)... Valve body, (7)... Cushioning material, (8)...
Annular circumferential groove, (9)...port, zero force...vertical groove.

Claims (3)

[Claims] (1) A cylindrical valve body with a diameter smaller than that of the casing and expandable and contractible is inserted into a casing in which short cylindrical parts are integrally connected to the upper and lower small-diameter opening ends, and the upper and lower ends of the valve body are The opening end of the cylindrical portion is fixed to the joint side, and a resilient cushioning material is interposed in the space between the outer circumferential surface of the valve body and the inner circumferential surface of the casing, and the inner circumferential surface of the cushioning material 1. A valve comprising: a port that receives the outer circumferential surface of the casing, and further includes a port that penetrates the buffer material from the outer circumferential surface of the casing to supply fluid between the valve body and the buffer material. (2) The valve according to claim 1, characterized in that an annular circumferential groove is provided in the center of the inner circumferential surface of the buffer material over the entire circumference, and the port is communicated with an appropriate position of the annular circumferential groove. (3) A longitudinal groove is provided on both sides of the inner circumferential surface of the cushioning material over the entire length, the central portion of which is in communication with the annular circumferential groove. 2) The valve described.