JP2736360B2 - Corrugated pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly, to a mountain line (large diameter portion) and a valley line (small diameter portion) in the longitudinal direction.
The present invention relates to a so-called corrugated pipe joint for connecting corrugated pipes having a continuous shape.

[0002]

2. Description of the Related Art Resin pipes in which a mountain line and a valley line are continuous in the longitudinal direction, that is, corrugated pipes, are widely used as various suction / drainage pipes for various types of industrial drainage such as industrial water, rainwater drainage, and industrial drainage, and underground drainage. Have been. Conventionally, as shown in FIG. 12, the corrugated pipes are connected with each other by abutting vertical cut surfaces of the corrugated pipes 52, 52, and having a joint 53 having convex portions 53, 53,. Made of a corrugated pipe joint 51 made of stainless steel, and the flange portions 54, 54 that have come into contact with each other are bolted.
This was done by tightening with a nut or the like.

[0003]

However, in the above-mentioned conventional corrugated pipe joint, no matter how strongly the flange is fastened to the joint of the corrugated pipe, the joint with the outer periphery of the pipe does not come into contact. Since a gap is formed in the portion, there is a disadvantage that water or the like passing through the inside of the pipe after connection is easily leaked to the outside. In addition, a gap is easily formed in the contact portion between the flange portions, and water leakage often occurs from this portion. Not only that, since corrugated pipes are often made of elastic members,
When stress is applied, the pipe is distorted together with the pipe, and as a result, a gap may be formed at a contact portion with the outer periphery of the pipe to cause water leakage. In particular, when the length of the pipe joint and the length of the outer periphery of the corrugated pipe did not completely match, the degree of water leakage was severe.

[0004] It is an object of the present invention to provide a joint capable of firmly connecting a corrugated pipe and exhibiting high water leakage prevention performance. Even if the pipe diameter varies, a similar effect is exhibited. An object of the present invention is to provide a joint for a corrugated pipe that can be used.

[0005]

According to the structure of the present invention, corrugated pipes in which mountain lines and valley lines are alternately formed abut against each other, and a belt-like portion is wound so as to cover the joined seam. In the joint connecting both pipes, two
A concave groove consisting of opposed tapered belt-like projections
At the abutment part of each mountain line separated by 3 pitches along the mountain line
Form at least one or more grooves
Then, a convex portion corresponding to two rows of valleys is formed by bulging, and the concave portion is formed.
Fill the groove with a liquid caulking agent and apply it to one edge of the strip.
While extending the tongue piece, make the joint of the corrugated pipe
When wound to cover, it overlaps with the tongue and faces
A fitting part for the tongue piece is provided inside the other end edge so as to be one.
In addition, on the back side of the tongue, over the entire width of the tongue,
Reduce the number of grooves consisting of two opposing tapered strips
And one or more liquid caulks are filled in the grooves.
Is to fill it.

Further, the caulking agent is preferably a water-swellable foam.
Being in the body.

Further, the joint for corrugated pipe is made of
Made of fiber reinforced polypropylene
It is in.

The caulking agent used in the present invention may be an elastic material such as a paste-like butyl rubber, a foam or a foamed elastic material such as a water-expandable foam or a foamed rubber, or a silicone-based caulking agent or a urethane-based caulking agent. etc,
Although various types can be mentioned, it is preferable to use a water-expandable foam from the viewpoint of exhibiting high water leakage prevention performance.

[0009]

The two pipes are connected by abutting the end faces of a corrugated pipe (hereinafter simply referred to as a pipe) and winding a strip of a corrugated pipe joint (hereinafter simply referred to as a joint) on the peripheral surface of the joint. However, at this time, the convex portion formed in the band-like portion is fitted into the valley of the pipe, so that the pipe does not come off or shift from the joint.

On the inner surface of the band portion of the joint, one mountain of the pipe in a state where the joint is wound around the pipe and a mountain of three pitches from the mountain are sandwiched (two mountain lines are sandwiched). A concave groove is provided at a position corresponding to a portion in contact with two mountain streaks with another mountain streak. Then, when the joint is wound on the pipe, the inner surface of the band-shaped part of the joint is pressed against the pipe peripheral surface while the convex portion is fitted to the valley and the position of the pipe is determined, and at the same time, each groove is also formed. It is squeezed along the top of the circumferential crest of the pipe. As a result, the caulking agent filled inside fills the gap between the joint and the pipe along each concave groove, so that the concave groove and the caulking agent are formed at the outer peripheral portions of the two crests sandwiching the joint of the pipe. Thus, the inside and the outside are completely shut off. Therefore, the joint exhibits high water leakage prevention performance and does not leak water or the like passing through the inside of the pipe to the outside. Also, the concave groove has two opposing tapered bands.
When the joint is attached to the pipe and pressed against the peripheral surface of the pipe because the projection is formed, the tip of the strip-shaped projection forming each concave groove is pushed outward and the peak of the pipe is expanded. Adhere to muscle. For this reason, the contact area between the pipe and the groove increases, the inside and outside of the groove and the caulking agent are more highly blocked, and the water leakage prevention performance of the joint is high. In addition, the tongue piece
And the fitting portion thereof , the tongue piece overlaps with the fitting portion and becomes flush when wound so as to cover the seam of the corrugated pipe at the time of connection. For this reason, there is no gap between the joint where the corrugated pipe is wound and the joint, and the band-like portion having the same inner surface and the concave portion provided on the tongue piece have two portions sandwiching the joint of the pipe. Since the inside and the outside are completely shut off at the outer peripheral portion of the mountain streak, the water leakage prevention performance of the joint is more complete. In addition, since the tongue and the fitting portion are provided, even when the diameter of the two pipes to be connected is slightly large, the tongue and the fitting portion do not overlap to form a gap, so that high water leakage prevention performance is achieved. Is expressed. In addition, on the back of the tongue, the full width of the tongue
Groove comprising two opposing tapered strips over
Is provided at least one, and also in the groove
Filled with liquid caulking agent, corrugated
To prevent water leakage from the joints where the pipe is wound and the joint
This does not impair the high water leakage prevention performance of the joint.
No.

The caulking agent may be a water-swellable foam.
If it is a body, it can exhibit a high water leakage function
Wear.

Further, the joint for a corrugated pipe is preferably
When made of fiber reinforced polypropylene
In addition to being able to express high tensile strength,
No elongation strain occurs even when used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 5 are views showing a joint according to an embodiment of the present invention. FIG. 1 is a perspective view, FIG. 2 is a plan view, FIG. 3 is a side view from the direction of arrow B in FIG. Figure 2
5 is an enlarged view of a cross section taken along line DD of FIG. 2. Reference numeral 1 denotes a joint integrally formed of glass fiber reinforced polypropylene, and a rectangular flat plate-shaped band portion 2 having a plurality of convex portions 5 formed on a plate surface;
Flanges 3a, 3b provided on the longitudinal edge of the strip 2 so as to rise in the direction opposite to the direction in which the protrusions 5 project.
And A tongue piece 6 is provided outside one of the flange portions 3b so as to be flush with and protrude from the plate surface of the band-shaped portion 2, while the other flange portion 3a is provided.
Is provided with a fitting portion 9 in which the surface of the band-shaped portion 2 is formed thinner than the surroundings by the thickness of the tongue piece 6. A thread groove 4 is provided at a position corresponding to the convex portion 5 of each of the flange portions 3a and 3b.

The protruding portions 5 projecting from the plate surface are the belt-like portions 2.
Are arranged at regular intervals in the longitudinal direction (hereinafter, referred to as a horizontal direction) and in a direction perpendicular to the longitudinal direction (hereinafter, referred to as a vertical direction), and the distance between rows (L1 in FIG. 2) )
Corresponds to the spacing between the valleys of the pipe. Also,
A pressing member 13 is provided on an upper portion of the convex portion 5 provided over the tongue piece 6.

On the strip portion 2 and the tongue piece 6, an interval of three pitches of the pipe crest is provided so as to cross the entire width in the horizontal direction (an interval of two rows of the convex portions of the strip portion). , Two concave grooves 7, 7 are provided in parallel. As shown in the enlarged cross-sectional view of FIG. 5, each concave groove 7 is formed by two opposing band-shaped projections 8, 8, and each of the band-shaped projections 8, 8 is formed to have a thin tip, and extends outward from the root to the tip. , And the tips are close to each other,
The inside thereof is filled with a caulking agent 12 composed of a water-swellable foam.

On the other hand, FIG. 6 is an enlarged view of the tongue piece 6 as viewed from the bottom surface (opposite surface of FIG. 2). Two concave grooves 7, 7 are provided, and the inside thereof is filled with a caulking agent 12 made of a water-swellable foam, similarly to the above.

Hereinafter, a method of connecting pipes using the joint of the present embodiment will be described. FIG. 7 is an explanatory view of a state in which pipes are connected using a joint, and FIG.
FIG. 9 is an enlarged view of a cross section along line E-F of FIG. 7. The joint 1 has two pipes cut along the mountain line such that the convex portion 5 is fitted into the valley of the pipe and the tongue piece 6 is fitted (contacted) with the fitting portion 9. Are wound around a joint (hereinafter referred to as a pipe joint 15) (FIG. 1 and FIG. 4 in the direction of arrow A).
The two pipes are connected by fastening the abutting flange portions 3a and 3b with bolts and nuts at the positions of the screw grooves 4. At this time, as shown in FIG. 7, the pipe joint 15 is positioned between two rows of convex portions between the two concave grooves 7, 7 of the joint 1. In addition, in order to express high water leakage prevention performance, it is preferable that all connecting pipes are cut along the top of the mountain line, but if any pipe is cut at the mountain line portion, Alternatively, it may be in a cut state in which a gap is formed between the pipes after the connection.

In a state where the pipes are connected, the two concave grooves 7 are pressed strongly along the top of the circumferential mountain line of the pipe 14. Along with this, the tips of the band-shaped projections 8, 8 of the concave groove 7 are pushed outward, and the caulking agent 12 filled inside fills the gap between the joint 1 and the pipe 14 along each concave groove 7. (See FIG. 8). For this reason,
Since the concave groove 7 and the caulking agent 12 completely block the inside and the outside at the outer peripheral portions of the crests of the two pipes across the pipe seam 15 (see FIG. 7), the joint has high water leakage prevention performance. It does not leak water or the like passing through the pipe 14 to the outside.

In a state where the pipes are connected,
Since the tongue piece 6 is fitted into the fitting portion 9 (the state shown in FIG. 9) and overlaps with each other, the two flange portions 3a and 3b fastened to each other.
There is no gap between them. When the flange portion is further tightened, in the portion where the tongue piece 6 and the fitting portion 9 overlap,
Two concave grooves 7 provided on the edge of the tongue piece 6 along the unevenness,
7 is strongly pressed against the fitting portion 9, and like the above-mentioned concave groove 7, the band-shaped projections 8, 8 are pushed outward and the caulking agent 12 filled inside is fitted with the tongue piece 6. The gap of the joint 9 is filled. For this reason, the inside and the outside of the concave groove 7 are completely shut off, and water or the like passing through the pipe 14 does not leak out from the gap between the fastened flange portions 3a and 3b. The high water leakage prevention performance of the joint 1 is not hindered. In the joint 1, even when the pipe diameter is slightly large and a gap is formed between the flanges, the tongue piece 6 covers the pipe joint in the gap, and the overlapping tongue piece 6 and the fitting section 9 do not form a gap. Maintain high water leakage prevention performance.

Further, in a state where the pipes are connected,
As shown in FIG. 9, the pressing member 13 presses the valley of the pipe 14 to increase the number of contact points to prevent the joint 1 from being displaced from the pipe 14. Therefore, the inside / outside cutoff by the concave groove 7 and the caulking agent 12 is not hindered by the displacement of the position between the joint 1 and the pipe 14, and the joint 1 can always maintain high water leakage prevention performance.

As described above, the joint 1 can not only connect one pipe but also connect a pipe having a large diameter by using a plurality of pipes. In this case, the tongue piece 6 of one joint 1 is fitted to the fitting portion 9 of the other joint 1, and the flange portions 3 a and 3 b abutted in that state are fastened with bolts 10 and nuts 11. And
Once a horizontally long joint is formed as shown in FIG. 10, it is wound and connected to the pipe joint in the same manner as in the above-mentioned single joint. FIG. 11 is a schematic diagram of a mounting cross section when two sets of pipes are connected. Even if the two pipes are connected in a pair, the tongue piece 6 and the inner surface of the band-shaped portion 2 are flush with each other, so that the same high water leakage prevention performance as when only one pipe is connected can be exhibited. Further, if necessary, an arbitrary number such as a set of three pieces, a set of four pieces, or the like can be set and provided for pipe connection.

On the other hand, not only glass fiber reinforced polypropylene but also various polyolefins such as polyethylene and polypropylene, various polyesters such as polyethylene terephthalate and polybutylene terephthalate, and thermoplastic resins such as polyamide and PPS are used for forming the joint. Alternatively, a thermosetting resin can be used alone, or these resins can be filled with glass fibers and used as a glass fiber reinforced thermoplastic resin or a glass fiber reinforced thermosetting resin. It is preferable to use glass fiber reinforced polypropylene, since glass fiber reinforced polypropylene can be exhibited and elongation strain does not occur even when used for a long time. Various fillers can be added to the resin as needed. The molding of the joint using these resins is not limited to integral molding, and other methods such as bonding or welding a separately molded band portion and a flange portion can be adopted.

The interval between the grooves provided in the belt-shaped portion is not limited to three pitches of the peaks of the pipe. Can be fixed, so that four pitches or five pitches may be used.

[0024]

According to the joint of the present invention, when the pipes are connected by winding the belt-shaped portion to the joint of the two pipes and tightening the flange portions, the concave groove and the caulking agent filled therein are filled with: Since the inside and the outside are completely shut off at the two outer peripheral portions of the crests sandwiching the seam of the pipe, the joint can exhibit high water leakage prevention performance. In addition, two opposite grooves
Formed by the tapered belt-like projections, when connected, the tips of the belt-like projections are in close contact with the crests of the pipe in a state of being spread outward, so that the water leakage prevention performance of the joint is further improved. . Furthermore, the tongue piece and its fitting part are
Because it is provided , when wound and connected to a pipe,
Since the tongue piece and the fitting portion overlap each other, and no gap is formed in the connection portion between the belt-shaped portions, more complete water leakage prevention performance can be exhibited. In addition, the diameter of the two pipes to be connected is slightly increased. Even in the case of a large size, the tongue piece and the fitting portion do not overlap each other to form a gap, so that higher water leakage prevention performance can be exhibited. In addition, on the back side of the tongue,
The number of grooves formed by two opposing tapered strips
At least one is provided, and liquid
Corrugated pipe filled with caulking agent
Due to water leakage from the joint of the joint and the joint
The high water leakage prevention performance of the joint is not hindered.

The caulking agent is a water-swellable foam.
In some cases, it can exhibit a high water leakage function
You.

Further, the joint for corrugated pipe is made of
When made of fiber reinforced polypropylene
In addition to being able to express high tensile strength,
No elongation strain occurs even when used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a joint of the present invention.

FIG. 2 is a plan view showing the joint of the present invention.

FIG. 3 is a side view from the direction of arrow B in FIG. 2;

FIG. 4 is a sectional view taken along line CC of FIG. 2;

FIG. 5 is an enlarged view of a cross section taken along line DD of FIG. 2;

FIG. 6 is an enlarged view of a tongue piece viewed from a bottom surface side.

FIG. 7 is an explanatory view showing a state in which pipes are connected using the joint of the present invention.

FIG. 8 is an enlarged view of a cross section taken along line EE in FIG. 7;

FIG. 9 is an enlarged view of a cross section taken along line FF of FIG. 7;

FIG. 10 is an explanatory view showing a state where two joints of the present invention are connected.

FIG. 11 is a schematic view of a cross section of a joint when pipes are connected by using a pair.

FIG. 12 is an explanatory view showing a conventional joint.

[Explanation of symbols]

1 ··· Joint, 2 ··· Band, 3a, 3b · · · Flange, 4 ··· Screw groove, 5 ··· Convex, 6 ··· Tongue piece, 7 ··· Groove, 8 ··· Band-like projection, 9 ..Mating parts, 10 bolts,
11 nuts, 12 caulking agents, 13 retaining members, 14 pipes, 15 pipe seams, 16
· Arrangement of convex parts, 51 · · joints, 52 · · pipes, 53 ·
-A convex part, 54 ... a flange part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichi Sato 7-3, Shioiri-cho, Mizuho-ku, Nagoya Co., Ltd. Sato Machinery Co., Ltd. In-house (56) References JP-A-60-29990 (JP, U) JP 5-34559 (JP, B2) JP 4-34039 (JP, B2)

Claims (3)

(57) [Claims] 1. A joint for connecting both pipes by abutting edges of corrugated pipes having alternately formed crests and valleys, winding a band-shaped portion so as to cover the joined seams , A concave groove consisting of opposed tapered belt-like projections
At the abutting part of each mountain line separated by 3 pitches on the inner surface, along the mountain line
And at least one or more convex portions corresponding to two rows of valleys are formed between the concave grooves.
And filling the groove with a liquid caulking agent , extending a tongue piece on one edge of the strip,
When wound to cover the seam of the pipe, the tongue piece
So that it overlaps with and is flush with the inside of the other end edge.
A tongue fitting portion is provided, and further, a tongue
Over the entire width of the
At least one groove is provided, and liquid
Fitting for corrugated pipe filled with caulking agent. 2. The caulking agent is a water-swellable foam.
2. The corrugated pie according to claim 1, wherein
For fittings. 3. The joint for corrugated pipe is made of glass.
Claims formed by fiber reinforced polypropylene
3. The joint for a corrugated pipe according to 1 or 2.