JPH076594B2 - Corrugated pipe joint structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint structure for a corrugated pipe, and more specifically, to a corrugated pipe having a concavo-convex surface continuous in the axial direction or a spiral corrugated surface on the surface. The present invention relates to a joint structure of corrugated pipes for connecting two corrugated pipes with each other.

(B) Conventional technology As various drainage pipes for rainwater drainage, underground drainage such as industrial water, various industrial drainage, etc., a synthetic resin pipe having a corrugated surface shape spirally extending in the circumferential direction, a so-called corrugated pipe is widely used. . As a corrugated pipe joint of this type, the "corrugated pipe joint" in Japanese Utility Model Laid-Open No. 1-82390 is known. This joint is designed to connect the corrugated pipes to each other even if the corrugated pipe of a standard length is cut in the middle of the corrugated pipe. This is a configuration in which a screw receiving portion with which the portion is screwed is provided.

In addition, in the "spiral pipe joint device" disclosed in Japanese Utility Model Laid-Open No. 63-99094, a rubber packing covers the entire circumference of the end portions of closely arranged spiral pipes, and a plurality of synthetic resin frontal arcs Of the joint plate, and the flange portion of the joint plate is coupled with bolts and nuts.

Further, the connecting side end of one of the corrugated pipes to be connected is formed to have an expanded diameter, the surface of the other corrugated pipe is formed flat, and as a joint structure of the corrugated pipes for inserting and joining these corrugated pipes, The "synthetic resin pipe" described in Japanese Utility Model Publication No. 1-60092 is known.

(C) Problems to be Solved by the Invention However, the above-described conventional corrugated pipe joint structure has a problem of water leakage and a problem that the pipe is weak in pulling in the axial direction. Further, in the above-described spiral pipe joint device, the pipe must be fastened with a considerable strength in order to prevent leakage of drainage, and thus the flange portion needs to be formed of a member capable of withstanding it. For example, since a joint device made of synthetic resin requires a flange made of a thick member, a larger mold is required as the joint device becomes larger, which causes an increase in the cost of the joint.
Even if the synthetic resin is replaced with a metal device, the strength is satisfactory, but corrosion due to moisture in the soil becomes a new problem. Furthermore, there is a problem that the pipe is deformed if the joint is excessively tightened to prevent leakage.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a joint structure for a corrugated pipe, which can be easily connected and can prevent leakage and drainage of drainage.

(D) Means for Solving the Problems The present invention is directed to two corrugated pipes each having a substantially cylindrical shape and having a ridge on the outer periphery of the body at a predetermined interval, and a recess for engaging the ridge on the inner surface of the body. A short substantially cylindrical portion having a groove and attached to the connection side end portion of each corrugated pipe, and extending from the connection side end portion of the substantially cylindrical portion in a direction perpendicular to the axial direction of the substantially cylindrical portion. A pair of cap bodies each of which is composed of an annular flange portion and on which an inclined surface opposite to the connecting side of the flange portions is formed, and an annular ring which is interposed between both flange portions of the cap bodies that are abutted with each other. A seal member,
It is composed of two ring-shaped members having a groove having a wedge-shaped cross section on the inner surface, and the both flange portions are fitted into the wedge-shaped groove such that the inner side surface of the groove contacts each inclined surface of the flange portion, It comprises a joint member that connects the pair of cap bodies and a fastening unit that fastens the split ring-shaped member in a direction in which the split ring-shaped members approach each other, and the flange portion has a connection side thereof when the corrugated pipe is mounted. The corrugated pipe joint structure is provided with a bag portion having a U-shaped cross section capable of locking an end portion, and the second seal member is annularly attached to the bag portion.

The present invention can be applied to a corrugated pipe (spiral pipe) in which a ridge is formed in a spiral shape on the outer periphery of the body, or a corrugated pipe in which the ridge is formed in a ring shape with respect to the corrugated pipe.

When the present invention is applied to the former, it is preferable to form a spiral recessed groove that can be screwed into the connection side end of the corrugated tube on the inner wall of the body of the cylindrical portion of the cap body. When the present invention is applied to the latter, the cap body is composed of at least two split members, and a substantially cylindrical portion is provided at the axial end of the substantially cylindrical portion of the divided cap body. It is preferable to provide a flange for connection.

The cap body and joint member of the present invention are preferably molded using a synthetic resin, and most preferably RIM molding using dicyclopentadiene as a main component.

(E) Action According to the present invention, the flange portions of the cap body attached to the joint side end portion of the corrugated pipe are butted against each other via the seal member, and then the peripheral edge of the flange portion is formed into a wedge shape of each joint member. When the joint members are fitted and covered in the groove and then the joint members are fastened by the fastening means, the joint members are brought close to each other, and the slopes of the wedge-shaped grooves of the joint member are correspondingly inclined to the respective slopes of the flange portion. The surfaces are respectively pressed toward the joining direction, which acts to connect and fix the two corrugated tubes in close proximity.

(F) Embodiments The present invention will be described in detail based on the embodiments shown in the drawings. The present invention is not limited to this.

This invention shows a joint structure for surely and firmly connecting corrugated pipes. The features of this invention are
Unlike the conventional joint structure in which the outer body of the corrugated pipe is fastened from the outer peripheral side of the corrugated pipe to the axial center of the pipe by using a band-shaped member, the end faces of the corrugated pipe are butted against each other via a sealing material, It is to connect the comrades in the axial direction. The following configuration and procedure will be specifically described.

FIG. 1 is an assembly diagram showing a joint structure for a corrugated pipe according to a first embodiment of the present invention. In the figure, 1A and 1B are substantially cylindrical, and are two corrugated tubes having spiral irregularities on the outer circumference of the body.

2A, 2B is a cap body, having a concave and convex to engage with the concave and convex on the inner surface of the body, short-shaped substantially cylindrical portion 2C, 2D screwed to the connection side end of each corrugated tube 1A, 1B And an annular flange portion 2E, 2F extending from the connection side end portion thereof in a direction perpendicular to the axial direction of the substantially cylindrical portion, and further the flange portion 2
Inclined surfaces 2G and 2H are formed on the side opposite to the connection side of E and 2F. It should be noted that each of the flange portions 2E and 2F is provided with recesses 2I and 2J for positioning and accommodating a seal member described later. Further, the cap bodies 2A and 2B are provided with bag portions 2K and 2L that lock the corrugated tube when screwed into the corrugated tube. The bag portion serves as a second sealing member for waterproofing the end surface of the corrugated tube. The liquid packings 3A and 3B are attached.

4 is an O-type packing as an annular seal member,
The corrugated pipes are interposed in the recesses 2I, 2J of the flange portions 2E, 2F in a state of being abutted with each other.

5A and 5B are semicircular clampers that are split into two as ring members, and have wedge-shaped grooves 5C and 5D on the inner surface. The clampers 5A and 5B have wedge-shaped grooves 5C and 5D that are the above flanges. The two flange portions 2E and 2F are fitted so as to come into contact with the respective inclined surfaces 2G and 2H.

Reference numeral 6 denotes a pin that rotatably connects the clampers 5A and 5B. The pin 6 is fitted with a split pin 7 so as not to be pulled out after passing through the hole of the clamper.

Reference numeral 8 denotes a bolt as a fastening means, which penetrates the hole 5E of the clamper 5A and the hole 5F of the clamper 5B and is also tightened by a nut 9 as a fastening means so that the clampers 5A and 5B are fastened in the respective directions. To do.

Next, a connection procedure in the joint structure of the first embodiment will be described with reference to FIG.

(1) First, on the bottom surfaces of the bag portions 2K, 2L of the cap bodies 2A, 2B, packing made of an elastic body or liquid packing 3A, 3
Insert or fill with B. A combination of insertion and filling is possible.

(2) Next, engage the concave grooves 2M, 2L of the cap bodies 2A, 2B with the spiral ridges 1C, 1D of the corrugated pipes at the respective ends of the left corrugated pipe 1A and the right corrugated pipe 1B to be connected. While screwing it enough, it cannot be rotated. In addition,
These operations may be performed after pipe making in the factory, or may be performed during on-site turning. By this method, the corrugated tubes 1A, 1B and the cap bodies 2A, 2B are integrated with the corrugated tube via the packings 3A, 3B.

(3) Next, attach O-type packings 4 to the recesses 2I, 2J of the cap bodies 2A, 2B, and taper surfaces 2G, 2H of the cap bodies 2A, 2B.
Adjust so that each has the same height. At this time, when the corrugated pipe is buried, the ground can be easily connected by providing a gap under the connecting portion into which the clampers 5A and 5B can be inserted. Further, in the case of connection on the ground which is not buried, it is preferable to provide a similar gap with a beating material such as a corrugated tube support stand.

(4) Next, the clampers 5A, 5B are closed along the tapered surfaces 2G, 2H of the cap bodies 2A, 2B so as to form a circular shape in the pipe axis direction, and the holes 5E, 5F of the clampers 5A, 5B are closed. The two corrugated pipes 1A and 1B are integrally connected and fixed by inserting the bolt 8 into the and screwing it with the nut 9.

FIG. 3 shows the external appearance of the corrugated pipe connected according to the above connection procedure.

Next, as a second embodiment, the present invention is applied to a corrugated tube that does not have a spiral ridge, that is, the ridge is formed in a ring shape with respect to the corrugated tube. It is shown in FIG.

In the figure, reference numeral 20 denotes a cap body that is divided into two parts, and the cap body 20 has a groove on the inner wall of its body portion that can be engaged with the projection of the corrugated tube, and is attached to the connection side end of the corrugated tube. It consists of a short cylindrical portion 20B, 20C, and a semi-annular flange portion 20D, 20E extending in a direction perpendicular to the axial direction of the substantially cylindrical portion from its connection side end portion, and further of the flange portion. The inclined surfaces 20F, 20 are provided on the side opposite to the connection side as in the first embodiment.
G is formed. 20H is a recess for storing the seal member, 20
I is a bag part for waterproofing the terminal of the corrugated pipe,
Liquid packing is attached to the bag portion 20I. 20J, 20K and 20L, 20M are flanges for connecting the substantially cylindrical portions 20B, 20C, and these flanges are connected by bolts and nuts not shown. And further flange part
20D and 20E are butted against the other flange portion (not shown), and are connected and fixed by a clamper, bolts and nuts having the same structure as in the first embodiment. As a result, even in a corrugated tube in which the ridge is formed in a ring shape with respect to the corrugated tube, connection can be made in the same manner as in the first embodiment.

Examples of the thermoplastic resin applicable to the cap bodies of the first and second embodiments include polyolefin, polystyrene, and AB.
Not only so-called general-purpose plastics such as S resin, AS resin, PVC resin, methacrylic resin, and fluorine resin, but also nylon, saturated polyester resin, polycarbonate resin, polyarylate resin, polyacetal resin, polysulfone, knitted polyphenylene ether resin, etc. Also applicable are engineering plastics and thermosetting resins exemplified in. In addition, materials obtained by blending these resins with fiber reinforced materials such as glass fibers and carbon fibers can also be applied as desired.

The cap body is molded by injection molding or RI.
M (Reaction Injection Molding) molding is suitable.
RIM molding is particularly preferred in the molding of this example. In molding, the monomer or oligomer as a plastic raw material is mixed at high speed with other additive components and injected into the mold, and at the same time, it undergoes a polymerization reaction to be solidified and molded. It can be said that it is molding.

Further, in RIM molding, typical resins that can be used in this embodiment include polyurethane resins, nylon resins, polyester resins and the like. Unlike the general injection molding method, RIM molding can be performed at a low temperature and a low pressure using a relatively low-viscosity liquid. Specifically, (1) two or more low-viscosity resin raw materials Collision of components with high pressure,
Mix (2) immediately inject into mold and (3) polymerize mixture in mold to make final product. It is also possible to add a reinforcing material or filler such as glass fiber or carbon fiber to the resin raw material component in order to improve the performance (mechanical, thermal physical properties, dimensional stability, etc.) of the RIM molded product, It is also possible to add a coloring agent and a release agent. The following table shows a qualitative comparison of the main RIM molding resins.

The corrugated tube used in this example typically has a diameter of 100.
The RIM molding resin is suitable for applications requiring a large size, especially in the field of civil engineering materials, because it is ~ 3000 mm and RIM can afford large moldings economically. Table 2 shows the typical physical properties of the dicyclopentadiene RIM resin molded product used in this example.

Dicyclopentadiene was produced by molding Metton (Teijin Hercules Co., Ltd.) using a RIM molding machine. Use of this RIM molded product is economical and inexpensive, and high impact strength can be obtained in terms of physical properties, so it is suitable for use.

As the packing that can be used for the O-type packings 3A, 3B and 4, any packing that has elasticity and has a sealing effect as a sealing material may be used. For example, one kind or two or more kinds of rubber, plastic, elastomer and foams thereof are suitable. In addition, water-sealing performance due to rubber elastic pressure and self-expansion of the gap of the pipe joint part caused by unequal subsidence etc. when contacting with water, self-filling these gaps and completely sealing to maintain water-tightness A sealant (for example, a water-expandable rubber elastic type sealant ... ADEKA ULTRA SEAL (Asahi Denka Kogyo Co., Ltd.)) can be used, and a one-pack type sealant (for example, ADEKA ULTRA SEAL p-201. Asahi Denka Kogyo Co., Ltd. is a moisture-curing type that can be used as a packing because it can be applied and adhered to wet and uneven surfaces.Use these packings and sealing materials in appropriate places As a result, the function of enhancing the liquid tightness between the corrugated tube, the cap body, and the cap body can be sufficiently exerted.

(G) Effect of the Invention According to the present invention, since the end faces of the corrugated pipe are fastened to each other in the longitudinal direction of the pipe through the packing, the connecting member of the joint does not become excessive and is relatively light. It can be fastened with any force. Further, the corrugated pipe is prevented from being deformed, and the corrugated pipes can be prevented from being pulled out. Furthermore, the flange part has a specific bag part,
Since the sealing member is attached to the bag portion, the liquid tightness of the joint connecting portion can be enhanced with an extremely simple structure.
Since the corrugated pipes can be connected by simply fastening the ring-shaped member with a set of bolts and nuts, the workability can be improved.

[Brief description of drawings]

FIG. 1 is an exploded view showing a joint structure of a corrugated pipe as a first embodiment according to the present invention, FIG. 2 is a sectional view of an essential part of the joint in the first embodiment, and FIG. 3 is a first embodiment. FIG. 4 is a perspective view showing a connection state in the example, FIGS. 4 (a) and 4 (b) are a perspective view showing a cap body of the joint structure of the second embodiment and a front view of the cap body seen from the inside. . Is. 1A, 1B …… Corrugated tube, 2A, 2B …… Cap body, 2C ……
Short, substantially cylindrical part, 2E ... Flange part, 2G, 2H ... Inclined surface, 2K, 2L ... Bag part, 3A, 3B ... Second seal member, 4
...... First seal member, 5A, 5B …… Joint member, 5C, 5D ……
Wedge-shaped groove, 8, 9 ...... Fastening means.

Claims (9)

[Claims] 1. Corrugated pipes having a substantially cylindrical shape and having ridges at predetermined intervals on the outer circumference of the body, and corrugated pipes each having a groove on the inner surface of the body for engaging with the ridge. Consisting of a short substantially cylindrical portion attached to the connection side end portion and an annular flange portion extending in a direction perpendicular to the axial direction of the substantially cylindrical portion from the connection side end portion of the substantially cylindrical portion, Also, a pair of cap bodies each having an inclined surface formed on the side opposite to the connection side of the flange portion, a ring-shaped first seal member interposed between both flange portions of the cap bodies that are abutted, and an inner surface It is composed of two split ring-shaped members each having a groove having a wedge-shaped cross section, and the both flange portions are fitted into the wedge-shaped groove such that the inner side surface of the groove abuts each inclined surface of the flange portion, And a joint member for connecting the cap bodies of Comprising a fastening means for fastening the hook-shaped member in the direction of approaching, the flange portion includes a bag portion having a U-shaped cross section capable of locking the connection side end portion when the corrugated pipe is mounted,
Further, a corrugated pipe joint structure in which a second seal member is annularly attached to the bag portion. 2. The joint structure according to claim 1, wherein the cap body and the joint member are molded by a RIM molding method using dicyclopentadiene as a main component. 3. The joint structure according to claim 1, wherein the ridges of the corrugated pipe are spirally formed on the outer periphery of the body. 4. The joint structure according to claim 1, wherein the ridge of the corrugated tube is formed in a ring shape. 5. The joint structure according to claim 3, wherein the substantially cylindrical portion has a spiral groove that can be screwed into the connection-side end of each corrugated tube on the inner wall of the body. 6. The cap body comprises at least two split members, and a flange for connecting the substantially cylindrical portion is provided at an axial end portion of the substantially cylindrical portion of the divided cap body. Item 4. The joint structure according to item 4. 7. The joint structure according to claim 1, wherein the flange portion has an annular recess for positioning and accommodating the annular seal member. 8. The joint structure according to claim 1, wherein the ring-shaped members are connected by a rotatable hinge, and a bolt through hole is provided at an end portion on a free end side. 9. The joint structure according to claim 1, wherein the fastening means are bolts and nuts.