JP3497994B2 - Joint structure and construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbed pipe connecting structure used for a sewer pipe or the like, and more particularly to a joint for connecting a ribbed pipe buried in the ground and a mounting pipe. Regarding the structure.

[0002]

2. Description of the Related Art Sewer pipes include vinyl chloride pipes, fume pipes, ceramic pipes, etc., which are buried and connected in the ground. Drainage water from each house, office building, factory, etc. is collected at the treatment plant through this pipe. As a conduit, in recent years
A plastic ribbed tube with excellent rigidity and lightness is also used.

Conventionally, a connection structure as shown in FIGS. 10 (a) and 10 (b) is used to connect the ribbed pipe and the mounting pipe. FIG. 10A is a vertical cross-sectional view of the connection portion of the ribbed tube. FIG.10 (b) is a cross-sectional view of the connection part of a ribbed tube.

As shown in FIGS. 10 (a) and 10 (b), when connecting the ribbed pipe 2 and the mounting pipe 3, the ribbed pipe 2 is attached to the saddle portion 14a of the rigid joint 14 made of rigid vinyl chloride. It is common to use a dedicated joint 14 having a groove 14b and a ridge 14c into which the rib 2b can be fitted, and the joint 14 and the ribbed pipe 2 are joined and bonded with an epoxy adhesive.

[0005]

However, such a rigid vinyl chloride joint positions the groove provided on the back surface of the joint and the rib around the perforated portion of the main pipe with ribs opened for connection, Attach by fitting. At this time, the fitting part is coated with an epoxy adhesive and cured,
Form a rigid connection structure.

In such a case, the fixed grooved joint cannot be used unless it is accurately fitted to the ribs around the perforated portion.
Be careful and skilled in drilling work. In addition, in this connection structure, because the epoxy adhesive is used for bonding, if the relative positional relationship between the ribbed main pipe and the mounting pipe changes due to uneven settlement after backfilling or an earthquake, stress concentrates on the joint. Therefore, peeling may occur in the epoxy adhesive. The peeled portion formed in this manner causes water leakage or intrusion of unknown water.

[0007] Epoxy adhesives are prepared by mixing and applying a main agent and a curing agent on site. However, it is necessary to leave the adhesive portion to stand until it cures. I cannot do the return work.

According to the present invention, the main pipe, which is a ribbed pipe, and the mounting pipe are connected by a flexible joint, and the displacement of the relative positional relationship between the mounting pipe and the ribbed main pipe caused by uneven settlement, an earthquake, or the like. It is an object of the present invention to obtain a joint structure capable of absorbing water by elastic deformation of the joint body and maintaining water stoppage.

[0009]

SUMMARY OF THE INVENTION The present invention is a joint structure comprising a ribbed tube, a mounting tube and a joint, wherein the ribbed tube and the mounting tube are connected by the joint. , The joint includes a flexible joint body, an elastic waterproof sheet, and a rigid tightening cover, the joint body has a tubular portion and a saddle portion, and the joint body has the ribs. It is arranged between the perforated part of the pipe and the mounting pipe, the tubular part is in close contact with the periphery of the mounting pipe, the tubular part is installed in the perforated part, and the saddle part is The elastic water blocking sheet extends from the tubular portion onto the annular rib on the surface of the perforated portion, the elastic water blocking sheet is disposed between the saddle portion and the annular rib, and the elastic water blocking sheet is the annular rib. Covering the entire circumference of The clamping cover has tightened from the outer periphery and the resilient waterproofing sheet and the saddle portion, the elastic waterproofing sheet is in close contact with the annular rib, in which according to the joint structure and its construction method.

The inventor of the present invention tried to use a flexible joint for connecting the ribbed pipe and the mounting pipe, and made various prototypes of joint structure and studied them. The flexible joint can prevent stress from being concentrated on the joint due to differential settlement after burying, an earthquake, etc., and can maintain the watertightness of the joint. Further, in such a flexible joint, the manhole and the main pipe or the attachment pipe and the main pipe can be connected by using a bonding method or a mechanical fixing method.

However, according to the research conducted by the present inventor, although such a flexible joint is used for a pipe for a circular pipe, it cannot be used as it is for a ribbed pipe which is a deformed pipe. all right. In the case of a ribbed tube, the annular rib prevents the fitting and the tube from coming into close contact with each other, so that sufficient water blocking cannot be achieved.

Based on such knowledge, the inventor of the present invention interposes an elastic water blocking sheet between the joint and the ribbed pipe when connecting the mounting pipe to the ribbed pipe, and attaches the ribbed pipe to the elastic water blocking sheet. By covering the circumference of the joint, it was found that the joint and the ribbed pipe were in close contact with each other and exhibited good water blocking performance, and the present invention was completed.

According to the present invention, the elastic water blocking sheet is fastened and fixed to the ribbed pipe, and the elastic water blocking sheet is tightly attached to the entire circumference of the mountain portion of the annular rib, whereby the watertightness of the joint structure is improved. To be kept.

In such a joint structure, by the tightening cover, at least one annular rib in the pipe axis direction of the ribbed main pipe perforating portion is tightened and sealed by the water blocking sheet made of an elastic material, which is flexible. The saddle part of the joint body is also pressure-tightly sealed to this water blocking sheet to form a water blocking structure.
Such a joint structure exerts sufficient waterproofness.

Further, in such a joint structure, even after the mounting pipe is connected and buried, even if the relative positional relationship between the mounting pipe and the ribbed main pipe changes due to uneven settlement, an earthquake, etc., the joint body is elastically deformed. Absorb displacement. For this reason,
In the joint structure of the present invention, the stress is not concentrated on the joint surface between the ribbed pipe and the mounting pipe, and the water-stopping property can be maintained even when uneven settlement occurs.

The joint structure of the present invention does not require positioning of the ribs of the ribbed pipe and the groove of the joint, but perforates the ribbed main pipe, winds an elastic waterproof sheet around the perforated portion, and forms the joint body. Fix it with the tightening cover in the installed state,
Construction can be performed by inserting the mounting tube into the cylindrical portion of the joint body and fixing it with a fastening band or the like.

As described above, such a joint structure does not require the skill and high degree of caution required when connecting a joint made of hard vinyl chloride with an adhesive. Further, in such a joint structure, it is not necessary to use an adhesive between the ribbed tube and the joint, and there is no defect such as stress peeling of the epoxy adhesive.

[0018]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view of a joint structure according to an example of the present invention. FIG. 2 is a cross-sectional view of the connection portion of FIG. FIG. 3 is a vertical cross-sectional view of the connection portion of FIG. Figure 4
FIG. 3 is a perspective view of an example of an elastic water blocking sheet according to the present invention. FIG. 5 is a front view showing an example of a joint body according to the present invention. FIG. 6 is a perspective view of an example of the tightening cover according to the present invention. FIG. 7 is a perspective view of another example of the tightening cover according to the present invention. FIG. 8 is a plan view showing how the elastic water blocking sheet is attached. FIG. 9 is a side view of a ribbed tube to which an elastic water blocking sheet is attached.

As shown in FIGS. 1 to 3, the joint structure 1 is
It has a ribbed pipe 2, a mounting pipe 3 and a joint 4, and the ribbed pipe 2 and the mounting pipe 3 are connected by a joint 4. As shown in FIGS. 2 and 3, the joint 4
Includes a flexible joint body 5, an elastic waterproof sheet 6 and a rigid tightening cover 7. The joint body 5 is
It has a tubular portion 5 a and a saddle portion 5 b, and the joint body 5 is arranged between the perforated portion 2 a of the ribbed pipe 2 and the mounting pipe 3.

The tubular portion 5a of the joint body 5 is in close contact with the periphery of the mounting pipe 3 and is installed in the perforated portion 2a. The saddle portion 5b projects from the tubular portion 5a onto the annular rib 2b on the surface of the perforated portion 2a.

The elastic water blocking sheet 6 is disposed between the saddle portion 5b and the annular rib 2b and covers the entire circumference of the annular rib 2b. The tightening cover 7 fastens the saddle portion 5b and the elastic water blocking sheet 6 from the outer periphery, and the elastic water blocking sheet 6 is pressure-bonded to the annular rib 2b.

In the present invention, as shown in FIGS. 2 and 3 and 4, a water blocking protrusion 5c is provided on the tubular portion 5a of the joint body 5, and the water blocking protrusion 5c is in close contact with the perforated portion 2a. Is preferred. In such a joint structure, the water-blocking projections 5c temporarily stop the perforated cross-section of the perforated portion 2a of the ribbed main pipe 2 to obtain higher water-tightness. In addition, as shown in FIGS. 1 to 3, the attachment pipe 3 and the joint body 5 can be fixed to each other by a fastening band 10.

Further, in the present invention, as shown in FIGS. 2 and 3, it is preferable that an adhesive layer 8 is provided between the saddle portion 5b and the elastic water blocking sheet 6. Such an adhesive layer,
Even if there is variation in the degree of tightening between the saddle part and the elastic water blocking sheet, the adhesive layer cushions and absorbs the uneven tightening, so the adhesion between the elastic water blocking sheet and the ribs increases, and the joint structure The water tightness of the can be improved. The adhesive material layer is not particularly limited in material, and a rubber-based adhesive material or the like can be used.

As shown in FIG. 5, the elastic water blocking sheet 6 used in the present invention has at least one annular rib 2b of the main pipe 2 with ribs at least at both ends of the perforated portion 2a in the pipe axial direction. It has a width that includes it and a length that winds the main tube 2 with ribs for at least one round. Further, the elastic water blocking sheet 6 has a perforated portion 6a larger than the perforated diameter of the perforated portion 2a for joining the mounting pipe of the ribbed main pipe 2.

In the joint structure shown in FIGS. 1 to 3, an elastic waterproof sheet 6 as shown in FIG. 5 is provided separately from the joint body. However, such an elastic water blocking sheet can also be formed by extending the saddle portion of the joint body. In such a case, the saddle portion of the joint body can be covered by itself so as to wrap the annular rib, and the joint structure obtained by such a joint body is provided with sufficient waterproofness and flexibility.

1 to 3, the saddle portion 5 of the joint body 5 is shown.
b and the elastic water blocking sheet, tighten the tightening cover 7 with the bolt 9
It is fixed by tightening. As shown in FIG. 6, the tightening cover has a width equal to or larger than the width of the elastic water blocking sheet 6, and is provided with a hole 7a into which the cylindrical portion 5a of the joint body 5 is inserted. The tightening cover 7 mounts the joint body 5 on the perforated portion 2a, and the elastic water blocking sheet 6 wound around the perforated portion 2a.
With the saddle portion 5b of the joint 5 in close contact with each other, the bolt 9 is fixed to the flange portion 7b so as to be tightened.

The tightening cover is not particularly limited as long as the joint and the elastic water blocking sheet are tightened and water locked. It is possible to use a cover that has a means for tightening with a bolt or a hook, is cut at at least one position in the circumferential direction, and can be attached so as to surround the ribbed tube.

For example, a cover 11 as shown in FIG. 7 can be used. The tightening cover 11 is provided with an opening 11a and an opening / closing part 11b, and the opening / closing part 11b is tightened by the claw 12 and the hook 13.

To construct the joint structure of the present invention, refer to FIG.
As shown in FIG. 8, an elastic waterproof sheet 6 as shown in FIG.
The perforated portion of the ribbed tube 2 has a hole 6 for the elastic water blocking sheet 6.
a together with at least one round of the ribbed tube 2, A
Wrap in the direction. FIG. 9 shows a state in which the elastic water blocking sheet 6 is wound around the perforated portion of the ribbed tube 2.

In addition, the joint body 5 shown in FIG. 5 is prepared so that the water-stop projections 5c are along the perforated cross section of the ribbed pipe 2.
Further, the saddle portion 5b is installed in close contact with the elastic water blocking sheet 6, the flange portion 7b of the tightening cover 7 as shown in FIG. 6 is opened, and the hole 7a of the tightening cover 7 is attached to the cylindrical portion 5a of the joint body 5. The elastic cover 9 is covered with the tightening cover 7, and the tightening cover 7 is tightened and fixed with the bolt 9. Joint body 5
Insert the mounting tube 3 into the cylindrical portion 5a of the
The cylindrical sleeve 5a is clamped and fixed at 0 to form the joint connection structure 1 as shown in FIGS.

In the present invention, the joint body can be formed of a material having various elasticity. This material is
It can be selected from synthetic rubber such as styrene-butadiene rubber, EPDM, chloroprene rubber, natural rubber, soft vinyl chloride resin, thermoplastic elastomer and the like.

The elastic waterproof sheet according to the present invention can be formed by selecting the same material as that of the joint body, and the thickness is preferably 1 to 5 mm. If the thickness is in this range, the resulting joint structure exhibits sufficient waterproofness due to the elastic waterproof sheet.

The pressure-sensitive adhesive layer according to the present invention is obtained by adding a tackifier, a softening agent, a filler and the like to synthetic rubber or natural rubber and molding it into a tape or sheet. Such an adhesive material layer has adhesiveness and plasticity and is excellent in sealing performance. Further, in addition to the above-mentioned compounding agent, a water-swellable resin can be added to the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer becomes a pressure-sensitive adhesive that absorbs water and expands, and exhibits good water-stopping performance. .

The rigid tightening cover, bolts, hooks and fastening bands used in the present invention may be made of stainless steel, rust-preventive plated steel, hard plastic, fiber reinforced plastic, or the like. These are desirable because they are difficult to corrode.

[0035]

According to the joint structure of the present invention, it is possible to prevent stress from concentrating on the joint portion due to differential settlement after burying, an earthquake, etc., and still maintain the watertightness of the joint portion.

Further, according to the method of constructing the joint structure of the present invention, it is possible to easily construct the joint portion which has been conventionally connectable only with the adhesive, without using the adhesive.

[Brief description of drawings]

FIG. 1 is a front view of a joint structure according to an example of the present invention.

FIG. 2 is a cross-sectional view of the connection portion of FIG.

FIG. 3 is a vertical cross-sectional view of a connection portion of FIG.

FIG. 4 is a perspective view of an example of an elastic water blocking sheet according to the present invention.

FIG. 5 is a front view showing an example of a joint body according to the present invention.

FIG. 6 is a perspective view of an example of a tightening cover according to the present invention.

FIG. 7 is a perspective view of another example of a tightening cover according to the present invention.

FIG. 8 is a plan view showing a step of attaching the elastic water blocking sheet to the ribbed tube.

FIG. 9 is a side view of a ribbed tube to which an elastic water blocking sheet is attached.

FIG. 10A is a vertical cross-sectional view of a connection portion of a conventional ribbed tube. (B) is a cross-sectional view of a connection portion of a conventional ribbed tube.

[Explanation of symbols]

1 joint structure 2 Ribbed tube 2a Perforated part 2b Annular rib 3 mounting tubes 4 joints 5 joint body 5a tubular part 5b saddle part 5c Water stop projection 6 Elastic waterproof sheet 6a Perforated part 7 Tightening cover 8 Adhesive layer 9 bolts 7a hole 7b Flange part 10 fastening bands 11 cover 11a opening 11b Opening / closing part 12 nails 13 hooks 14 joints 14a saddle part 14b groove 14c mountain

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Takahashi 2-4-11 Sakaemachi, Soka City, Saitama Prefecture (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 33/00 F16L 33/28 F16L 41/08 F16L 41/02 F16L 47/02 F16L 21/00

Claims (4)

(57) [Claims] 1. A joint structure comprising a ribbed pipe, a mounting pipe, and a joint, wherein the ribbed pipe and the mounting pipe are connected by the joint, wherein the joint is flexible. A joint body, an elastic waterproof sheet, and a rigid tightening cover, the joint body has a tubular portion and a saddle portion, and the joint body has a perforated portion of the ribbed pipe and a mounting pipe. Is disposed between, the tubular portion is in close contact with the periphery of the mounting tube, the tubular portion is installed in the perforated portion,
The saddle portion extends from the tubular portion onto an annular rib on the surface of the perforated portion, the elastic water blocking sheet is disposed between the saddle portion and the annular rib, and the elastic water blocking sheet is provided. Covers the entire circumference of the annular rib, the tightening cover tightens the saddle portion and the elastic water blocking sheet from the outer circumference, and the elastic water blocking sheet is in close contact with the annular rib. The characteristic is a joint structure. 2. The joint structure according to claim 1, wherein a water blocking protrusion is provided on the tubular portion, and the water blocking protrusion is in close contact with the perforated portion. 3. The joint structure according to claim 1, wherein an adhesive layer is provided between the saddle portion and the elastic water blocking sheet. 4. In obtaining a joint structure, which comprises a ribbed pipe, a mounting pipe, and a joint, and the ribbed pipe and the mounting pipe are connected by the joint, the joint is flexible. A joint main body, an elastic waterproof sheet, and a rigid tightening cover, the joint main body has a tubular portion and a saddle portion, and the joint main body includes a perforated portion of the ribbed pipe and a mounting pipe. Place it between
The tubular portion is closely attached to the periphery of the attachment pipe, the tubular portion is installed in the perforated portion, the saddle portion is projected from the tubular portion onto the annular rib on the surface of the perforated portion, and the elasticity is provided. A water blocking sheet is arranged between the saddle part and the annular rib, the elastic water blocking sheet covers the entire circumference of the annular rib, and the tightening cover surrounds the saddle part and the elastic water blocking sheet. A method for constructing a joint structure, characterized in that the elastic waterproof sheet is brought into close contact with the annular rib.