JP2021046873A - Pipe connection structure - Google Patents

Abstract

To provide a pipe connection structure capable of preventing water leakage reliably, enhancing workability for piping, and further capable of facilitating maintenance.SOLUTION: Upstream and downstream pipes 2a and 2b are fitted and bonded so as not to come out. The entire circumference is covered with a waterproof rubber 6 so as to straddle a pipe end 5c of the pipe 2b outside a fitting adhesive part 5. In a case where a poor adhesion occurs in a part of the fitting adhesive part 5, water leakage from the poorly adhered part is prevented by the waterproof rubber 6. In a case where the waterproof rubber 6 deteriorates, the waterproof rubber 6 is replaced without removing the fitting adhesive part 5.SELECTED DRAWING: Figure 2

Description

The present invention relates to, for example, a pipe connection structure for connecting an aluminum rainwater drainage pipe installed in a building.

In general, PVC pipes (hard polyvinyl chloride pipes) and white gas pipes (carbon steel pipes for piping [zinc-plated steel pipes]) are often used for rainwater drainage pipes in buildings, and the PVC pipes and white gas pipes are used. It is formed by dividing it into a size that can be carried and handled, and is connected when it is installed in a building to form a rainwater drainage pipe.

For the connection of the PVC pipe, for example, a pipe joint called a socket, an elbow, or a T-shaped pipe is used, and by fitting the pipe end portion of the PVC pipe to the socket, the upstream side and the downstream side via the pipe joint. PVC pipes, or in addition to these, branch pipes are connected. The fitting portion between the pipe joint and the PVC pipe is adhered by applying an adhesive to prevent the PVC pipe from coming out of the pipe joint and prevent water leakage from the fitting portion.

Welded joints are used to connect the white gas pipes, and for example, a mechanical connection structure as disclosed in Patent Document 1 is used. The mechanical connection structure is often used to connect white gas pipes to metal joints, so-called MD joints, and connects multiple white gas pipes via various MD joints such as sockets, elbows, and Y-shapes. It is designed to do.

As shown in FIG. 9, in the pipe connection structure of Patent Document 1, the end of the second pipe 102 is inserted into the enlarged diameter portion of the end of the first pipe 101, and the packing material 103 is inserted between them. Further, the push ring 104 is fitted onto the second pipe 102, and the metal split ring 105 is provided so as to be inscribed in the push ring 104 with the outer peripheral edge inscribed. By moving the push ring 104 with the bolts and nuts 106, the packing material 103 is pushed into the first pipe 101 and the second pipe 102, and the inner peripheral edge of the split ring 105 is pressed against the second pipe 102. Leakage and pipe escape are prevented.

Jitsukosho 61-13836 (Column 3, Fig. 1)

However, when connecting pipes by adhesion, there is a risk of water leakage if poor adhesion occurs, and welding of vertical pipes, horizontal horizontal pipes, etc. must be performed on-site over the entire circumference of the pipe. It takes time and effort, and it tends to be difficult to stabilize the quality.

Further, the pipe connection structure of Patent Document 1 obtains two effects of water stoppage by a packing material and fixing of a pipe by a split ring by one operation of tightening bolts and nuts, and water stoppage by a packing material is obtained. Only the fixing of the pipe may be completed with insufficientness. Moreover, in the unlikely event that the packing material deteriorates after the connection of the pipes is completed, it is necessary to disconnect the pipes when replacing the packing material, which may take time and effort for maintenance of the pipes.

Further, when the pipe connection structure of Patent Document 1 is adopted and an MD joint is used, the MD joint is made of cast iron and has a large wall thickness, so that it tends to be heavy. Need to be installed. In particular, when connecting the horizontal pulling pipe under the floor slab, an elevator is required because the hanging source of the winch cannot be secured, and it is easy to take time and effort to install the pipe.

An object of the present invention is to provide a pipe connection structure capable of reliably preventing water leakage, improving workability of pipe work, and facilitating maintenance.

In order to achieve the above object, the pipe connection structure according to the present invention is provided with a fitting adhesive portion formed by fitting and adhering the pipe ends of the upstream pipe and the downstream pipe so as not to come out, and the upstream pipe and the pipe connecting structure. Of the downstream pipes, the area of the fitting adhesive portion that straddles the pipe end of the pipe located on the outside is covered with a waterproof rubber over the entire circumference.

According to the above configuration, since the upstream side and downstream side pipes are fitted and bonded, the pipes can be easily and surely fixed. Furthermore, since it is covered with waterproof rubber so as to straddle the pipe end of the pipe on the outside of the fitting adhesive portion, even if a part of the fitting adhesion of the pipe has a poor adhesion, water leakage from the poorly bonded part should occur. Can be prevented. Moreover, since the water blocking rubber is attached separately from the fitting and bonding of the pipes, each of the pipe fixing effect and the water leakage prevention effect can be surely obtained, and in the unlikely event that the water blocking rubber deteriorates, it is fixed. The waterproof rubber can be replaced without removing the piping.

Further, the waterproof rubber may be tightened from the outer peripheral side by a joint material covering the entire circumference thereof.

According to this configuration, since the entire circumference of the waterproof rubber is tightened from the outer peripheral side with the joint material, the waterproof rubber can be uniformly compressed inward and brought into close contact with the pipe end of the fitting adhesive portion to prevent water leakage. The function can be enhanced. Moreover, since the entire circumference of the waterproof rubber is covered with a joint material, the waterproof rubber can be protected from photodegradation and ozone deterioration, and its durability can be enhanced.

Further, the joint material may be provided with a swelling regulating portion that regulates swelling in the flow path direction due to tightening and compression of the waterproof rubber.

According to this configuration, since the joint material is provided with a swelling restricting portion, when the waterproof rubber is tightened inward and compressed, the swelling of the waterproof rubber in the flow path direction is restricted by the compression to prevent the water from swelling. It is possible to suppress compression deformation of rubber. As a result, the waterproof rubber can be compressed inward with a strong force to be in close contact with the pipe end of the fitting adhesive portion, and the compression rate can be reduced, reducing the compression set that occurs over time. As a result, the durability of the waterproof rubber can be increased.

Further, at least one of the upstream pipe and the downstream pipe may be an aluminum pipe.

According to this configuration, since an aluminum pipe is used for at least one of the pipes, the workability of the pipe work can be improved because the aluminum pipe is lighter than the vinyl chloride pipe or the white gas pipe. Here, if the conventional connection structure of the white gas pipe fixed by the metal split ring is adopted for the connection of the aluminum pipe, the connection structure of the present invention is likely to cause deformation and surface scratches to reduce the durability. According to this, it is possible to prevent a decrease in durability while adopting an aluminum pipe.

Further, the upstream pipe and the downstream pipe may be drainage pipes provided in the building.

According to this configuration, since the connection structure of the present invention is adopted for the drainage pipe inside the building, which is more difficult to maintain than the drainage pipe outside the building, the high watertightness and durability required for the drainage pipe inside the building are required. Can be met.

As described above, according to the present invention, by fitting and adhering the upstream side and downstream side pipes and covering the entire circumference with a waterproof rubber so as to straddle the pipe ends of the outer pipes, the upstream side and the downstream side are covered. The piping is easily and securely fixed, and water leakage from the mating adhesive part is prevented. Furthermore, by separating the fitting and bonding of the pipes and the installation of the waterproof rubber as separate processes, both the pipes can be fixed and water leakage can be prevented, and if the waterproof rubber deteriorates, the fixed pipes can be installed. The waterproof rubber can be replaced without removing it. As a result, it is possible to surely prevent water leakage from the connecting portion of the piping, improve the workability of the piping work, and facilitate the maintenance of the connecting portion of the piping.

Layout of rainwater drainage pipe with pipe connection structure according to the present invention An exploded perspective view of the pipe connection structure Side view of piping connection structure Side view of upstream and downstream piping Perspective view of waterproof rubber Cross-sectional view of waterproof rubber Side view of joint material AA sectional view of FIG. 7 Diagram showing a conventional connection structure

Hereinafter, a mode for carrying out the pipe connection structure according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the connection structure 1 is for connecting, for example, a pipe 2 having a size that can be handled to form a rainwater drain pipe 4 inside the building 3, and is upstream. The downstream pipe end 5a of the side pipe 2a is inserted into the upstream pipe end 5b of the downstream pipe 2b, and is bonded so as not to come out to form the fitting adhesive portion 5, and further, the fitting adhesive portion is formed. In 5, the entire circumference of the upstream pipe end 5c of the downstream pipe 2b located on the outer side in the radial direction is covered with the waterproof rubber 6 so as to straddle the flow path direction, and the entire circumference of the waterproof rubber 6 is covered. It is tightened from the outer peripheral side by the covering joint material 7.

As shown in FIGS. 1 to 4, the pipe 2 is an aluminum pipe formed by dividing it into a length that can be carried and handled, and the downstream side pipe end portion 5a thereof is upstream of the downstream side pipe 2b. The diameter is reduced so that it can be fitted to the side pipe end portion 5b. A special filling adhesive 8 made of, for example, an elastic adhesive is applied to the upstream pipe end portion 5b, and the special filling adhesive 8 adheres the upstream pipe 2a and the downstream pipe 2b so as not to come out. At the same time, it absorbs the thermal expansion and contraction of the pipe 2.

The fitting adhesive portion 5 formed by fitting and adhering the downstream pipe end 5a of the upstream pipe 2a to the upstream pipe end 5b of the downstream pipe 2b is formed by fitting and adhering the water blocking rubber 6 and the joint material 7. The water is stopped and the connection structure 1 is formed.

The rainwater drainage pipe 4 guides the rainwater collected by the roof drain 9 installed on the roof of the building 2 to the buried pipe 10 in the ground, and appropriately has a flanged short pipe 11, an elbow 12, and a T-shape. It is constructed inside the building 3 while connecting the pipe 2 by the connection structure 1 with the pipe 13, the flanged PVC pipe 14 and the PVC elbow 15 interposed therebetween.

As shown in FIGS. 2, 3, 5, and 6, the water blocking rubber 6 is a strip-shaped rubber plate having a length substantially the same as the peripheral length of the pipe 2, and is located near the center in the width direction on the downstream side. Two bulging portions 16 are formed so as to sandwich the upstream pipe end 5c of the pipe 2b in the flow path direction to stop water, and the two bulging portions 16 are closely attached to the periphery of the pipe 2 by elastic force to stop the water. A folded-back portion 17 for water is formed.

As shown in FIGS. 2, 3, 7, and 8, the joint material 7 has three aluminum arc plates 19a and 19b via hinge pins 18 so as to form a cylindrical shape that can be opened and closed as a whole. , 19c are hinged together, and the waterproof rubber 6 is arranged inside the hinge joint.

Cylindrical bolt holding portions 21 for holding the bolts 20 for tightening the joint material 7 are formed at the ends of the arc plates 19a and 19c on both sides, and the aluminum rod-shaped semi-cylindrical nuts 22 and the bolt holding portions 21 are formed on the bolt holding portions 21. A semi-cylindrical washer 23 is inserted. The bolt holding portion 21 is formed with a notch that exposes the bolt holes of the semi-cylindrical nut 22 and the semi-cylindrical washer 23, and the bolt 20 is screwed into the bolt hole to tighten the joint material 7.

By attaching the joint material 7 to the fitting adhesive portion 5 of the pipe 2, the waterproof rubber 6 covers the upstream pipe end 5c of the pipe 2b on the downstream side so as to straddle the flow path direction, and the joint material 7 is covered with the bolt 20. By tightening the water stop rubber 6, the water stop rubber 6 is pressed against the peripheral surface of the pipe 2 to be brought into close contact with the pipe 2, and the fitting adhesive portion 5 is stopped from water.

On both inner side edges of the arc plates 19a, 19b, 19c, a swelling restricting portion 24 having a groove-shaped cross section is screwed so as to sandwich the waterproof rubber 6 arranged inside the joint member 7 in the width direction. It is fastened. The swelling regulating portion 24 regulates the swelling in the flow path direction due to the tightening compression of the waterproof rubber 6, so that the waterproof rubber 6 is brought into close contact with the peripheral surface of the pipe 2 by the strong tightening force of the joint material 7. It is possible to suppress the compression set of the water blocking rubber 6 by reducing the compression ratio of the water blocking rubber 6 in the thickness direction while reliably stopping the water.

According to the above configuration, the pipes 2a and 2b on the upstream side and the downstream side are fitted and adhered so as not to come out, and then the waterproof rubber 6 and the joint material 7 are attached to the fitting adhesive portion 5 to form the pipe 2. Since the connection structure 1 is configured, the pipes 2a and 2b can be connected with sufficient strength, and water leakage from the connecting portion can be reliably prevented. As a result, for example, even if rainwater stays in the rainwater drainage pipe 4 due to fallen leaves, dust, and muddy dust accumulated inside the rainwater drainage pipe 4, the water pressure of the rainwater acts on the connection structure 1 from the connection structure 1. It is possible to prevent the pipes 2a and 2b from coming off and water leakage.

Further, since the fixing of the pipes 2a and 2b by fitting and bonding and the water stopping by attaching the water blocking rubber 6 and the joint material 7 can be performed as separate operations, the pipe fixing effect by fitting and bonding and the water stopping can be performed. The water leakage prevention effect of the rubber 6 and the joint material 7 can be surely obtained. Moreover, in the unlikely event that the waterproof rubber 6 deteriorates, the waterproof rubber 6 can be replaced without removing the fixed pipes 2a and 2b.

Further, since the joint material 7 is provided with the swelling restricting portion 24 to reduce the compressibility of the waterproof rubber 6 in the thickness direction, the compression set of the waterproof rubber 6 is suppressed and its durability is improved. Can be done. As a result, in addition to increasing the strength and watertightness of the connection structure 1, the durability of the connection structure 1 can be increased, and the rainwater drainage pipe to the inside of the building 3 is more difficult to maintain than the outside of the building 3. 4 can be installed. Moreover, by installing the rainwater drainage pipe 4 inside the building 3, it is possible to prevent photodegradation and ozone deterioration of the waterproof rubber 6, and it is possible to further enhance the durability of the connection structure 1.

Further, unlike the conventional mechanical connection structure, it is not necessary to tighten and fix the pipe with a metal ring that prevents it from coming off, so that the pipe 2 is made of aluminum, which is relatively susceptible to deformation and surface scratches that reduce durability. A pipe can be adopted. The aluminum pipe is lighter than the PVC pipe and the white gas pipe that are often used in general, and the work of assembling the pipe 2 inside the building 3 and installing the rainwater drainage pipe 4 can be facilitated accordingly. ..

Further, by adopting the above connection structure 1, the elbow 12 at the bent portion of the rainwater drainage pipe 4 and the T-shaped pipe 13 at the confluence portion can be formed in the same cross section as the pipe 2 at the general portion. As a result, the members of the bent portion and the merging portion of the rainwater drainage pipe 4 can be sufficiently reduced in weight as compared with the thick MD joint made of cast iron used as a conventional metal joint, and the rainwater drainage pipe 4 can be made lighter. Installation work can be facilitated.

The present invention is not limited to the above-described embodiment, and modifications can be made as appropriate within the scope of the present invention. For example, in the connection structure 1, not only the rainwater drainage pipe 4 can be formed inside the building 3 by connecting the pipes 2, but also the rainwater drainage pipe 4 can be formed outside the building 3, and further, the water pipe can be formed. It can be used to connect all types of pipes such as water pipes, sewage pipes, and gas pipes. Further, the connection structure 1 can be adopted not only for connecting aluminum pipes but also for connecting PVC pipes, white gas pipes and the like. Further, the swelling restricting portion 24 may be omitted as appropriate, and further, the joint material 7 may be omitted and the fitting adhesive portion 5 may be stopped by only the waterproof rubber 6.

1 Connection structure 2 Piping 2a Upstream side piping 2b Downstream side piping 3 Building 4 Rainwater drainage pipe 5 Fitting adhesive part 5a Downstream side pipe end 5b Upstream side pipe end 5c Upstream side pipe end 6 Water stop rubber 7 Joint material 8 Dedicated filling adhesive 9 Roof drain 10 Buried pipe 11 Short pipe with flange 12 Elbow 13 T-shaped pipe 14 PVC pipe with flange 15 PVC elbow 16 Swelling part 17 Folded part 18 Hinging pin 19a, 19b, 19c Arc plate
20 Bolt 21 Bolt holding part 22 Semi-cylindrical nut 23 Semi-cylindrical washer 24 Swelling control part

Claims (5)

A fitting adhesive portion is provided so that the pipe ends of the upstream pipe and the downstream pipe cannot be pulled out and are fitted and bonded. Of the upstream pipe and the downstream pipe, the pipe located on the outside of the fitting joint is provided. A pipe connection structure characterized in that the area straddling the pipe end is covered with waterproof rubber all around. The pipe connection structure according to claim 1, wherein the waterproof rubber is tightened from the outer peripheral side by a joint material covering the entire circumference thereof. The pipe connection structure according to claim 2, wherein the joint material is provided with a swelling regulating portion that regulates swelling in the flow path direction due to tightening and compression of the waterproof rubber. The pipe connection structure according to claim 1, 2 or 3, wherein at least one of the upstream pipe and the downstream pipe is an aluminum pipe. The pipe connection structure according to claim 1, 2, 3 or 4, wherein the upstream side pipe and the downstream side pipe are drainage pipes provided in the building.

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