JP2003194266A - Spiral corrugated tube and connecting method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spiral corrugated tube and a connecting method therefor, enabling tube connection without a fear of a water leak even when displacement is generated in a connecting portion of a buried tube due to uneven settlement and the like. <P>SOLUTION: A corrugated tube comprising a water expansion rubber sponge block 3 having a shape same as a trough portion, and a water expansion sponge rubber sheet 4 connecting to the water expansion rubber sponge block 3 and having a length same as a circumference of a crest portion 1 is used in connecting tube both end portions of a spiral corrugated tube. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water supply system, a sewer system,
The present invention relates to a plastic pipe (hereinafter referred to as a spiral corrugated pipe) having a spiral groove used as a conduit for agricultural water channels, drainage channels, and information channels such as electric wires and communication lines, and a connecting method thereof.

[0002]

2. Description of the Related Art In recent years, due to the expansion of maintenance of water and sewerage systems and the increase of underground burying of electric wires, communication lines, etc., fume pipes, ceramic pipes such as ceramic pipes and vinyl chloride pipes, polyethylene pipes which have been conventionally used as pipelines. The use of corrugated tubes is increasing with isoplastic tubes.

These corrugated pipes are lighter than conventional ceramic pipes, and are used for underground burial of plastic pipes which have been expanded by exhibiting usefulness for transportation, burial, etc., prevention of deformation during service, improvement of earthquake resistance, etc. For the purpose, the use under the road and on soft ground is increasing. However, when the corrugated pipe is a large-diameter pipe, for example, a large-diameter pipe having a diameter of 600 mm to 2,000 mm, a spiral corrugated pipe having a spiral groove portion is economically effective and widely used.

[0004]

However, the spiral corrugated pipe is effective as a so-called independent pipe in which the groove is continuous over the entire pipe and the groove is independent at right angles to the pipe axis, a ribbed pipe, and the like. Since it is not possible to attach a ring-shaped waterproof material such as a rubber ring or a sponge rubber ring to a groove, it is extremely difficult to stop the water when connecting the pipes. In addition, the filling of caulking material and the like is often unfavorable due to an increase in construction man-hours and construction costs, and a satisfactory product has not been obtained.

The present invention solves such a problem, and even when the buried pipe is displaced due to unequal subsidence or the like, the spiral corrugated pipe can be connected without fear of water leakage. And providing a connection method thereof.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, a water-expandable rubber sponge block having a shape similar to a valley at both end portions of a connecting portion of a spiral corrugated tube, and a mountain portion 1 connected thereto.
It is a corrugated tube provided with a water-expanded sponge rubber sheet having a length of a circumference.

The use of the corrugated pipe facilitates the connection of pipes, the branching of manholes, handholes, etc., and the connection with the connecting body, and the connection with excellent water-stopping property can be easily performed. Even if a problem such as uniform subsidence occurs, the water stopping property is maintained.

The water-expanded sponge rubber block is not particularly limited in its material, and natural rubber, chloroprene rubber, styrene-butadiene rubber, ethylene-propylene rubber or the like can be used, but its specific gravity is 0.2 to 0. ．
8. It is desirable that the water expansion ratio is 1.5 to 5 times.
If the specific gravity is less than 0.2, the rubber sponge becomes extremely rough, resulting in a decrease in water stopping ability. When the specific gravity exceeds 0.8, the water-stopping ability can be improved, but it may hinder the fitting to the corrugated pipe, and the followability to the trough of the corrugated pipe is also deteriorated. Therefore, it is not preferable. If the water expansion ratio is less than 1.5 times by volume, the desired water-stopping effect of the present invention may not be sufficiently obtained, and if it exceeds 5 times, the pipe may be deformed due to expansion when entering water. In addition to the risk of causing this, the water-expandable rubber sponge becomes expensive and is not economically preferable.

Furthermore, the water-expanded rubber sponge block is
Even if it is a water-expandable rubber sponge block composite having a specific gravity of 0.2 to 0.8 on the outer surface and a water expansion ratio of 1.5 to 5 and a non-expandable sponge rubber on the inner surface. And is economically more effective.

The water-expandable rubber sheet connected to the water-expandable sponge block preferably has a specific gravity of 0.2 to 0.8, a water expansion ratio of 1.5 to 5 and a thickness of 1 to 10 mm. If the specific gravity is less than 0.2, the rubber sponge becomes extremely rough and the water-stopping ability is deteriorated. If the specific gravity exceeds 0.8, the fitting and followability to the corrugated pipe mountain portion may be insufficient. If the thickness is less than 1 mm, the water stopping property of the corrugated pipe ridge becomes insufficient, and if the thickness exceeds 10 mm, the attaching property to the corrugated pipe ridge and the followability are impaired. In addition, when connecting, it is often difficult to tighten and tighten from the outer peripheral portion. The length of the water-expandable rubber sheet needs to correspond to one round of the spiral tube mountain portion, and if it is less than one circle, water leakage from the mountain portion occurs at the time of connection. Further, the water-expanded rubber sheet of the present invention can exert a water-stopping effect even if it is a composite having a non-expanded sponge rubber on the inner surface as long as the surface is the water-expanded rubber specified above, and is economically useful. Is.

The connection of the water-expandable sponge rubber block and the water-expandable rubber sheet and the attachment to the spiral tube are not particularly specified, but rubber adhesives such as natural rubber or synthetic rubber, acrylic-based, modified acrylic-based, urethane-based adhesives. The use of isoadhesives is not particularly hindered and the object of the invention is reached.

[0012]

EXAMPLES The present invention will now be described in more detail with reference to examples.

"Example 1" Two 700Φ spiral corrugated pipes (Toyodrain spiral pipe manufactured by Toyo Kagaku Co., Ltd.) shown in FIG. 1 (side sectional view) have a specific gravity of chloroprene rubber base of 0.5 at the end valley. , Water expansion ratio 3 times, height 82mm, bottom 5
Water-expanded rubber sponge block (CRK best seal EWS) of 5 mm, top surface 122 mm, and a specific gravity of 0.45 adhesively connected to it, water expansion ratio 3 times, thickness 4 mm, width 25 m
m, length 2,600 mm, water-expanded rubber sponge sheet (CRK best seal EWS) was used as a ridge and bonded with a chloroprene rubber adhesive (CRK bond C-41), and a pipe connection cover was attached. A water-stop test was carried out as outlined in. It was held at a water pressure of 0.05 MPa for 1 month,
No water leakage was observed.

Example 2 Two 800Φ spiral corrugated pipes (Toyodrain spiral pipe manufactured by Toyo Kagaku Co., Ltd.) shown in FIG. 1 (side sectional view) have a specific gravity of chloroprene rubber base of 0.5 at the end valley. , A water-expansion rubber composite block (CRK best seal EWSF) having a height of 92 mm, a bottom surface of 62 mm, and an upper surface of 130 mm, which was obtained by adhering a water-expansion rubber sponge sheet having a water-expansion ratio of 3 times and a thickness of 8 mm to the surface, and adhesively connected to it. Specific gravity 0.45 Water expansion ratio 3 times, thickness 3mm, width 30m
The water-expandable rubber composite sheet (CRK best seal EWSF) is prepared by adhering a chloroprene sponge rubber sheet having a thickness of 3 mm, a width of 90 mm and a length of 3,000 mm to the surface of a water-expandable rubber sponge sheet having a length of m and a length of 3,000 mm. Then, a pipe connection cover was attached, and a water stop test schematically shown in FIG. 5 was carried out. It was held at a water pressure of 0.05 MPa for 1 month, but no water leakage was observed.

[0015]

As shown in Examples 1 and 2, the water-expandable sponge rubber block and the water-expandable rubber sheet-equipped spiral corrugated tube of the present invention are excellent in that they can be easily connected without water leakage. It is an attached tube.

[0016]

[Brief description of drawings]

FIG. 1 is a schematic side view of a spiral wave tube to be connected,
Indicates a spiral corrugated tube, indicates a connecting portion, indicates a valley water-expandable rubber sponge block, and indicates a mountain water-expandable sponge rubber sheet.

FIG. 2 is a side cross-sectional view of a spiral corrugated tube, wherein indicates a water-expandable rubber sponge block having a shape equivalent to a valley, and indicates a water-expandable sponge rubber sheet having a length corresponding to one round of a crest.

FIG. 3 shows a water-expanded sponge block composite, with the non-expanded sponge rubber on the inner surface.

FIG. 4 is an example of a cross-sectional shape of a mountain water-expanded sponge rubber sheet, and shows a mountain water-expanded sponge rubber sheet composite having a non-expanded sponge rubber on the inner surface.

FIG. 5 shows an example of a pipe water stoppage test method with a spiral wave,
Indicates a water stop cover for the connection portion, indicates a sealing plate for the pipe end portion with a spiral wave, and indicates a water pressure gauge.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 9/06 H02G 9/06 A (72) Inventor Akio Hashikawa 306 Koyagi-cho, Takasaki-shi, Gunma C F-Terms in ARL Kay Co., Ltd. (reference) 2D063 BA02 BA26 BA27 3H015 BB05 BC04 3H111 AA02 CA03 CA42 CB02 CB14 CB27 CB28 DA14 DB03 DB05 DB17 5G369 AA05 BA04 DC04 DC09 DC17 EA01

Claims (6)

[Claims] 1. A spiral corrugated product comprising a water-expandable rubber sponge block having a shape similar to a valley at both ends of a connecting part and a water-expanding sponge rubber sheet having a length corresponding to one round of a crest connected to the block. tube. 2. A specific gravity of 0.2 to 0.8 and a water expansion ratio of 1.5.
The spiral corrugated pipe according to claim 1, which is a water-expandable rubber sponge block. 3. A water-expandable rubber sponge block composite body having a specific gravity of 0.2 to 0.8 and a water expansion ratio of 1.5 to 5 on the outer surface and a non-expandable sponge rubber on the inner surface. The spiral corrugated tube according to claim 1, characterized in that 4. A specific gravity of 0.2 to 0.8 and a water expansion ratio of 1.5.
The spiral corrugated pipe according to claim 1, which is a water-expanded rubber sponge sheet having a thickness of 5 to 10 mm. 5. The inner surface is a non-expandable sponge and the outer surface has a specific gravity of 0.2.
~ 0.8, water expansion ratio 1.5 ~ 5, thickness 1 ~ 10m
The spiral corrugated tube according to claim 1, which is a water-expanded rubber sponge sheet composite of m. 6. The spiral corrugated pipe end portion according to claim 1,
Spiral corrugated pipe connection method that is fastened and fixed with a plate or molded outer frame.