JPS5827435B2 - Waterproof sealing material used in the connection gap between pipes and plates. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a synthetic resin waterproof seal that is effective when interposed between pipes buried in the soil or gaps between connecting sheet piles for retaining earth that are driven into the soil. Regarding parts.

The above-mentioned sealing member is made of a synthetic resin having a hydrophilic group such as hydrophilic urethane, ethylene oxide, or polyvinyl alcohol (see, for example, Japanese Patent Publication No. 38750/1983). When the group and water come into contact and water molecules are taken in between the resin molecules, it expands and expands in the softening process, and in a so-called dry state where it does not come into contact with water, it has rubber-like elasticity. .

By the way, the synthetic resin material with the above-mentioned properties was originally developed as a waterproof sealing material, and it has already been used at the fitting connection part of Huyum tubes, as shown in Figure 1, as well as the male and female parts of split tubes. A method has been proposed in which the synthetic resin material expands upon contact with water and closes the gap between the male and female sockets, thereby achieving a waterproof effect. However, with this method, the resin material starts expanding when it comes into contact with water, and when the expansion pressure hits the pipe wall and encounters resistance, further expansion in the direction of the pipe wall is prevented, so the continued expansion is prevented. Pressure tends to escape in the axial direction of the tube, where there is no resistance, so it does not act much in the direction of the tube wall.
You can't expect a waterproof effect.

For this reason, as shown in Figure 2, shallow grooves A are concentrically formed on the peripheral walls of the male and female sockets, and the inner and outer surfaces of the resin material are inserted into these grooves. It has also been proposed to prevent expansion in this direction and cause expansion exclusively in the direction of the tube wall, but since there is a fitting opening between the male and female sockets in the axial direction of the tube, it is necessary to use a shallow groove. The part of the material facing between the gaps other than A swells as shown in the imaginary line and escapes into the gap opening, so in this case as well, no expansion pressure can be applied in the direction of the pipe wall as in Figure 1, ensuring a reliable sealing effect. cannot be expected.

Therefore, taking the example of the Hume tube shown in FIG. 2 above, the present invention aims to prevent the resin material from expanding in the axial direction of the tube as shown in the imaginary line, and as a means for this purpose, the resin material is used. It is intended to be inserted into a strong cloth tube with a small elongation rate, and to restrict the direction of expansion of the material so that it acts on the circumferential wall of the tube.

The details of the embodiment will be described below with reference to the drawings.

1 is a rod-shaped hydrophilic polyurethane resin element which has a hydrophilic group and expands and expands when water comes into contact with the hydrophilic group and water molecules are incorporated between the molecules; A material is selected that has rubber-like elasticity before contact, and that softens and expands by about twice its cross-sectional area upon contact with the water.

Therefore, the gist of the present invention is that the sealing member A is constructed by inserting the resin body 1 in a tight fit into a tough cloth tube 2 which has a small elongation rate and allows water to penetrate.

In this embodiment, a synthetic resin film 3 of the same quality as the resin body 1, which also expands upon contact with water, is provided on the surface of the tube 2. It is used to create a completely waterproof wall to prevent water from leaking out in capillary form, and is used for connections between pipes that do not require strict sealing accuracy, or for connections between sheet piles used at construction sites. In this case, the film 3 is not necessary.

In addition, the tube 2 is made of high-strength polyester fiber (
It is made of plain weave or braided material with a breaking elongation of 5% or more.

Also, since the seal member A is shown for use in a hume pipe in this example, it is formed into an endless ring shape that can be fitted around the outer circumference of the hume pipe, but it can be wrapped around the outer circumference of the hume pipe in a linear shape that can be used. Of course, it is also fine.

Hereinafter, an example of waterproof sealing of a connecting portion of a hume pipe using the above-mentioned sealing member will be described.

The above-mentioned sealing member A is fitted or wrapped around the male socket of the fume pipe as shown in Fig. 5 in the usual manner, and is slightly crushed into the gap between the outer wall surface of the male socket and the inner wall surface of the female socket. interpose it.

Then, when water in the soil enters through the gap in the pipe, it first comes into contact with the hydrophilic groups of the film 3, and the water molecules are taken in between the molecules, expanding and expanding. The expanded material adheres to the tube wall, and the water that has permeated the membrane comes into contact with the resin body 1 through the tube's fabric, so that the resin body 1 also expands in the same manner as described above, but the resin body itself Since the tube is surrounded by a non-stretchable tube, the expansion pressure inside the tube of the above-mentioned body increases by 1 to 1, and therefore the expansion pressure tries to escape from the part where there is no resistance, i.e. in the axial direction of the tube. but,
Since this direction is also constrained by the tube, it cannot escape, and as a result, the pressure pressing against the tube wall is effectively maintained, achieving a complete waterproof sealing function.

In addition, when water is taken into the resin body 1, the body 1 is restrained by the tube, so it is hardened considerably, so it is necessary to balance the hardness and the pressure applied to the tube wall of the body. Of course, the element body 1 may be made of independent foam in order to have the same properties.

Furthermore, since this example shows an example in which the seal member is used as a waterproof seal between humid pipes, a thin rectangular cross-section is shown, but a thin plate-shaped seal member is used between flat connecting gaps between sheet piles. In short, various cross-sectional shapes depending on the gap between the parts to be sealed, such as a circular cross-section as shown in Fig. 6 or a triangular cross-section as shown in Fig. 7. Of course, one can be selectively used.

As described above, according to the present invention, the expansion pressure of the resin body caused by contact with water is increased in the tube, and the direction of expansion is restricted to the direction that acts on the sealing part. It has a great feature, as it makes it possible to waterproof seal the connection gaps between various parts, such as earth retaining sheet piles that can be driven into the structure.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory drawings, Figure 3 is a partially cutaway front view of the seal member, Figure 4 is an enlarged side sectional view of a part of the metal top, and Figure 5 is the seal member fitted into the hume pipe. 6 and 7 are cross-sectional views of modified examples of the sealing member. 1... Synthetic resin body, 2... Cloth tube.

Claims (1)

[Claims] 1. A synthetic resin element having a hydrophilic group and a rubber-like elasticity that expands and expands when the hydrophilic group and water come into contact and water molecules are taken in between the molecules. A waterproof sealing member used in a connecting gap between tubes or plates, characterized by being inserted tightly into a cloth tube that allows water to penetrate.