JP3026052B2 - Connection structure between main pipe and branch pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a main pipe and a branch pipe, and preferably for connecting a main pipe buried underground and a branch pipe such as a sewer pipe. It relates to a connection structure.

[0002]

2. Description of the Related Art As sewer pipes buried underground, fume pipes, ceramic pipes, and vinyl chloride pipes are known. A branch pipe is connected to the main pipe of the sewer pipe. Through this branch pipe, drainage from each house, office building, factory, etc., flows, and the drainage is merged with the main pipe.

FIG. 7 shows an example of a connection structure between a main pipe and a branch pipe. In this example, a case where a vinyl chloride pipe is used as the main pipe 1 will be described. An opening is made in the main pipe 1 by using a horsaw or the like, and the surface of the periphery of the opening is cleaned. The branch pipe 13, which is also a PVC pipe, and the main pipe 1 are connected to the branch pipe joint 2.
Connect using 1. The branch pipe joint 21 is a molded product of hard vinyl chloride, and includes a cylindrical portion 22 and a flange portion 23.

[0004] A dedicated adhesive for hard vinyl chloride is applied to the joint surface between the main pipe 1 and the branch pipe joint 13, and after application, the main pipe 1 is bonded to the main pipe 1.
While pressing down and the branch pipe joint 13 at the same time, they are joined and bonded. The amount of the special adhesive required per one joint is about 80 g.

[0005] However, while the direction of the main pipe is straight, the number of branch pipes is large, and the directions of the branch pipes extending from the connecting portion between the main pipe and the branch pipe are different from each other. On the other hand, since the connection method described above must be adopted,
It is necessary to correct the "deviation" of the mounting angle of the branch pipe from the intended angle, which has occurred during the piping work and the mounting work of the branch pipe.

However, in the operation of bonding the branch pipe joint to the main pipe with a special adhesive, if the state of the joint surface or the drying time changes, the adhesiveness is greatly affected and fluctuates. For this reason, it is an operation requiring a great deal of attention and skill, and it takes time. As a result, the mounting angle of the branch pipe is also likely to fluctuate. However, when the mounting angle of the branch pipe fluctuates and deviates from the target angle in this manner, the branch pipe joint 21 is
Is firmly adhered to the main pipe 1, so that the angle deviation of the branch pipe cannot be corrected or absorbed. Therefore, it is extremely difficult to attach the branch pipe to the main pipe.

Further, it is necessary to adhere the branch pipe joint to the main pipe 1 with a special adhesive, but in this case, it is necessary to sufficiently remove dirt and moisture on the joint surface, which is troublesome. Also, if a large amount of the special adhesive is used, the solvent component of the special adhesive will erode toward the main pipe, so that
g of special adhesive over the entire joint surface
It is necessary to apply sufficiently uniformly. However, because the adhesive layer is thin, it is difficult to secure a water-stop surface for adhesion.
It is likely to cause water leakage or unknown water to enter the mains.

When it is difficult to apply and connect with such a special adhesive, an epoxy resin-based bonding agent can be used. This is a two-part reaction type bonding agent. But,
Unlike special adhesives, about 35 per joint
About 0 g of a bonding agent is required.

Further, since the bonding agent is a two-pack reaction type bonding agent, after mixing the main agent of the bonding agent and the curing agent, the bonding portion is allowed to stand for at least 30 minutes or longer so that no external force is applied. It is necessary to Moreover,
Only after the strength of the bonding agent has developed, the branch pipe cannot be connected to the branch pipe joint. After confirming that the bonding agent has sufficiently hardened, it is necessary to connect the branch pipe to the branch pipe joint and backfill the whole. Therefore, the construction time becomes longer and the construction cost increases.

[0010] Furthermore, when the above-mentioned special adhesive is used or when a two-part bonding agent is used,
The joint between the main pipe and the branch pipe joint is firmly bonded. However, when the branch pipe is connected to the main pipe for a long period of time, the ground is unduly settled, so that the relative positional relationship between the main pipe and the branch pipe changes. As a result, stress concentrates on the connecting portion between the branch pipe and the main pipe, and peeling of the joint surface occurs. This separation causes water leakage and infiltration of unknown water.

In the case of a fume tube, there is known a method of performing a water stopping process by filling a connection portion between a branch tube and a main tube with mortar. However, particularly in the case of such a water stopping method, when the above-mentioned uneven settlement occurs, water leakage due to separation of the joint surface and intrusion of unknown water are very likely to occur.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that, when a long time has passed after construction,
The purpose of the present invention is to prevent leakage or unknown water from entering by preventing stress from concentrating on a connecting portion between a branch pipe and a main pipe and causing separation of a joint surface.

Another object of the present invention is to provide a connection between a main pipe and a branch pipe so that the installation of the branch pipe does not require skill or a high degree of attention. Further, an object of the present invention is to easily attach the branch pipe joint to the main pipe when an error or deviation occurs between the mounting direction of the branch pipe joint and the direction of the target branch pipe. It is to be able to correct the gap.

Another object of the present invention is to prevent water leakage and unknown water intrusion due to difficulty in securing an adhesive water-stop surface. Another object of the present invention is to prevent the time required for construction from being lengthened, as in the case of using a two-component bonding agent, and to facilitate construction in a short time.

[0015]

According to the present invention, a connection structure between a main pipe and a branch pipe includes a joint body having a main pipe covering portion and a tubular portion, a joint body fixing member and a branch pipe fixing member. The main pipe covering portion is formed of a plate-shaped core material made of a rigid material and an elastic material that embeds the core material, and the core material has a shape of an outer peripheral surface of the main pipe in advance. The branch pipe is bent so as to fit, and the branch pipe is inserted into the tubular portion. The branch pipe is fixed to the joint body by the branch pipe fixing member. The main pipe coating part is fastened to the main pipe by the joint body fixing member, and the core material causes the elastic material to be compressed by the tightening pressure of the joint main body fixing member. It is especially important that the To.

[0016]

According to the present invention, the main pipe covering portion is constituted by a plate-like core material made of a rigid material and an elastic material burying the core material. Before being crimped to the pipe, the pipe is bent in advance so as to conform to the shape of the outer peripheral surface of the main pipe. The elastic material is uniformly pressed against the outer peripheral surface of the main pipe by the tightening pressure of the fixing member. Thus, the joint body is connected to the main pipe while maintaining stable watertightness. Therefore, the joint portion between the joint body and the main pipe is not a rigid joint using an adhesive, but buffers the peeling force due to earth pressure or the like applied to the joint surface, and the joint body is elastically deformed, so that the main pipe and the main pipe are not deformed. There is room for absorbing relative position changes.

Therefore, when improper subsidence of the ground occurs for a long time after construction, stress applied to the connecting portion between the branch pipe and the main pipe can be reduced and absorbed. Therefore, the problem of the related art of peeling off the rigid joint surface does not occur, and it is possible to prevent water leakage and unknown water intrusion due to the problem.

Further, if the main pipe covering portion of the joint main body is fixed to the main pipe by the joint main body fixing member, the joint main body can be mounted on the main pipe. Therefore, a high level of skill and attention is not required as in the case of using a special adhesive or a two-part adhesive.

Further, when the main pipe and the joint body are connected and fixed to each other, even if the mounting direction of the joint body has a considerable error or deviation when viewed from the intended direction,
This error or displacement can be easily absorbed and corrected by deforming the joint body when inserting and connecting the branch pipe to the joint body.

Further, according to the present invention, leakage of water or infiltration of unknown water due to difficulty in securing an adhesive water-stop surface cannot occur.

Also, unlike the case where a two-part bonding agent is used, since the construction can be easily performed as described above, the time required for the construction is short, the construction can be completed quickly, and the construction site can be backfilled. it can.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an annular projection is formed on the inner surface of a cylindrical portion, and this annular projection can be pressed against the outer surface of a branch pipe. When the position of the branch pipe changes abnormally due to uneven settlement of the ground, if the tubular part having the rigid core material is directly in contact with the outer surface of this branch pipe without any gap,
Large stress is applied to the joint body, and stress is applied to the joint surface between the joint body and the main pipe. As a result, phenomena such as peeling of the joint surface occur, which causes leakage or entry of unknown water.

However, if the annular projection is pressed against the outer surface of the branch pipe, when the position of the branch pipe changes abnormally, the abnormal position change of the branch pipe can be absorbed by the annular projection. No large stress is applied to the joint body. Therefore, peeling of the bonding surface as described above can be prevented.

Further, when the position of the branch pipe at the junction changes greatly due to uneven settlement, the effective cross-sectional area of the branch pipe decreases, and the pressure loss increases. However, when the cylindrical portion is formed of a cylindrical core material made of a rigid material and an elastic material including the core material, when the position of the branch tube changes, the movement of the branch tube becomes the core. Locked by material. That is, the core acts as a stopper.

When a layered water-stopping material is sandwiched between the outer peripheral surface of the main pipe and the inner peripheral surface of the main pipe covering portion and the water-stopping material is pressed, the water-stopping effect is further improved. In addition, even when a situation occurs in which the pressure on the main pipe covering portion decreases due to the movement of the ground or the like, the water stopping effect is maintained by the action of the water stopping material.

Further, in the present invention, since the core material is buried in the main pipe covering portion, the layered water-stopping material is pressed by the core material over the entire surface of the water-stopping material toward the main pipe side. Join uniformly. Therefore, since the water stopping property can be ensured over the entire surface of the water stopping material, a high water stopping property can be maintained.

If a tightening band crimped along the outer peripheral surface of the main pipe is adopted as the joint body fixing member, the construction is particularly easy and no skilled person is required. Further, the tightening pressure of the tightening band can be adjusted by a tensile force adjusting member such as a bolt or a screw.

Between the outer peripheral surface of the branch pipe and the inner peripheral surface of the cylindrical portion,
When the layered water-stopping material is sandwiched and pressed, the water-stopping effect is further improved. In addition, even in the case where the pressure on the branch pipe is reduced due to the movement of the ground or the like, the effect of the water stopping material maintains the water stopping effect.

The height of the annular projection formed on the inner surface of the cylindrical portion is preferably 5 to 20 mm. This height is 5
By setting it to be at least mm, even if the positional change due to the deviation of the angle of the branch pipe is large, the deviation can be absorbed. If this height exceeds 20 mm, the water stoppage tends to be poor.

The water-stopping material is preferably a butyl rubber-based adhesive tape or the like. In this case, since the water-stopping material adheres to the main pipe, the main pipe covering portion, the branch pipe, and the tubular portion, a water-stopping effect due to the adhesion can also be achieved. Further, a water-swelling water-stopping material can be used as the layered water-stopping material.

Examples of the elastic body constituting the joint body include natural rubber and synthetic rubber such as EPDM, styrene butadiene rubber and chloroprene rubber; soft vinyl chloride resin, soft vinyl chloride elastomer, urethane elastomer and olefin thermoplastic elastomer. And styrene-based thermoplastic elastomers.

The core material having rigidity may be iron,
Metal plate such as zinc steel plate, stainless steel plate and aluminum plate;
Plastic board reinforced by fiber, such as FPR;
Hard plastic plates such as vinyl chloride, ABS resin, polyethylene terephthalate, etc. can be used.

Hereinafter, a more specific connection structure will be exemplified.
FIG. 1 is a cross-sectional view showing a connection structure according to an embodiment of the present invention, and is a cross-sectional view obtained by cutting the entire connection structure along a diametrical cross section of the main pipe 1. FIG. 2 illustrates the connection structure of FIG.
It is also a cross-sectional view obtained by cutting along the diametrical cross section of the main pipe 1.
It shows a front view.

FIG. 3 is a front view showing the entire connection structure of FIG. 1 and FIG. FIG. 4 is a cross-sectional view of the same connection structure as above, taken along the length direction of the main pipe 1.

FIG. 1 is a sectional view taken along the line II in FIGS. 3 and 4. FIG. 2 is a sectional view taken along the line II-II in FIGS. 3 and 4. FIG. 3 is a front view of the main pipe 1 in FIGS. 1 and 2 as viewed from the lateral direction. FIG. 4 is a cross-sectional view of FIG. 1 and FIG.
FIG. 4 is a sectional view taken along line IV.

In this embodiment, the main pipe 1 and the branch pipe 13 are substantially perpendicular to each other. The joint body 3 includes a tubular portion 4 and a main pipe covering portion 5. The cylindrical portion 4 is the same as that of the main pipe covering portion 5 shown in FIG.
4 protrudes upward in FIG.
Is almost orthogonal. The tubular part 4 and the main pipe covering part 5 are both formed of an elastic body. A cylindrical core material 7 is embedded inside the tubular portion 4, and a core material 6 is embedded inside the main pipe covering portion 5.

The distal end of the branch pipe 13 is inserted inside the cylindrical portion 4. In the vicinity of the end of the cylindrical portion 4, the cylindrical portion 4
On the outer peripheral surface of the fastening band 1 as a branch pipe fixing member
5 is wound therewith, so that the branch pipe 1
3 is tightened and fixed.

A tape-shaped layered waterproof material 14 is sandwiched between the inner surface of the cylindrical portion 4 and the outer surface of the branch pipe 13, and is pressed by the pressure of the tightening band 15. An annular projection 10 is formed inside the cylindrical portion 4. In the present embodiment, the number of the projections 10 is two, and three annular spaces 11 between these projections 10 are formed.

Each projection 10 abuts and holds the outer surface of the branch pipe 13. A projection 9 protrudes below the end surface 13a of the branch pipe 13, and the projection 9 causes the branch pipe 13 to protrude.
Is prevented from entering the main pipe 1. A substantially circular protrusion 8 is provided below the protrusion 9. The main pipe 1 is provided with an opening 1a for connection with the branch pipe 13, and a projection 8 is inserted along the edge of the opening 1a. Protrusion 8
And the edge of the opening 1a are in contact with each other without any gap.

The main pipe covering portion 5 has a substantially horseshoe shape as a whole. That is, when the main pipe coating portion 5 is cut in the diameter direction of the main pipe 1, as shown in FIG. 2, it forms an arc shape following the main pipe 1. However, in the portion where the tubular portion 4 exists in the main pipe covering portion 5, as shown in FIG.
An opening having a shape substantially following the shape of a is open.

In the main pipe 1, the peripheral part of the opening 1 a is covered with a main pipe coating portion 5. The core material 6 made of a rigid material has a horseshoe shape substantially the same as the main jacket 5, but its size is slightly smaller than that of the main jacket 5.

In this embodiment, two fastening bands 2
Is used as a member for fixing the joint body. Each of the tightening bands 2 is wound along the outer peripheral surface of the main pipe 1 and the main pipe covering portion 5. As a result, the main pipe covering portion 5 is fixed to the main pipe 1 by the tightening band 2, and the main pipe covering portion 5 is crimped toward the main pipe 1. This pressure is adjusted using the adjuster 2a.

In this embodiment, a layered waterproof material 19 is sandwiched between the outer peripheral surface of the main pipe 1 and the inner peripheral surface of the main pipe covering portion 5 and pressed. As shown in FIGS. 1, 3 and 4, the water-stopping material 19 has a substantially horseshoe shape like the main pipe covering portion 5.

When the tightening band 2 is provided at one place,
On the side where the tightening band 2 does not exist, the water stopping performance may be slightly inferior. On the other hand, when the number of the tightening bands 2 increases, the working time increases, and the cost increases accordingly. Therefore, it is optimal that the number of the tightening bands 2 is two.

As described above, the layered water-stopping material 19 has substantially the same horseshoe shape as the main pipe covering portion 5, but the water-stopping material 19 is pressed over almost the entire surface of the main pipe covering portion 5 in this manner. In this case, the highest bonding strength and water stopping performance can be obtained. However, a plurality of rows of elongated linear layered water-stopping materials are interposed, and between each water-stopping material, preferably 20 mm to
They can be arranged at intervals of 30 mm.

When connecting the branch pipe 13 to the main pipe 1, first, an opening 1a is formed at a predetermined position of the main pipe 1 by drilling with a forsaw or the like. The joint surface on the main pipe 1 side is wiped clean with a rag or the like. Next, the main pipe covering portion 5 of the joint main body 3 is positioned with respect to the opening 1a, and a layered water-stopping material 19 is sandwiched between the main pipe covering portion 5 and the joining surface of the main pipe 1 and pressed. The main pipe covering part 5 is tightened with the tightening band 2.

The branch pipe 13 is inserted into the tubular portion 4 of the branch pipe joint 3. At this time, a layered water-stopping material 14 is sandwiched between the outer peripheral surface of the branch pipe 13 and the tubular portion 4. The circumference of the cylindrical portion 4 is tightened with the tightening band 15, and the branch pipe 13 is fixed to the cylindrical portion 4.

At this time, when a two-component bonding agent or a special adhesive is used as in the conventional case, it is necessary to prevent water from remaining on the bonding surface on the main pipe 1 side. However, in the present embodiment, even if a small amount of water remains on the joint surface on the main pipe 1 side, when the water-stopping material 19 is next pressed against the joint surface of the main pipe 1, this water is in the water-stopping material 19. And is contained in the water-stopping material 19, so that there is no adverse effect on the water-stopping property.

The above connection structure was actually manufactured, and its water stopping property, in particular, its ability to follow a change in the position of the branch pipe 13 was confirmed. The connection structure shown in FIGS. 1 to 4 was created. At this time, a vinyl chloride pipe having a nominal diameter of 200 mm was used as the main pipe 1, and a vinyl chloride pipe having a nominal diameter of 150 mm was used as the branch pipe 13. As the water-stopping materials 14 and 19, butyl-based adhesives were used.

As schematically shown in FIG. 5, the test container 18
The connection structure is installed in the inside, the valve 16 is closed, and the supply port 1 is
Water was supplied from 7 into the test container 18 as shown by the arrow A. The water pressure was set to 1 kgf / cm ^2, and the presence or absence of water leakage was confirmed over 1 minute. Further, as shown in FIG. 6, the central axis C of the branch pipe 13 was inclined by an angle θ with respect to the central axis B of the joint body 3 initially installed, and the above-described water leakage test was performed in this state.

As a result, according to the connection structure of this embodiment,
θ is 0 °, 5 °, 10 °, 15 °, 20 °, 25 °, 3
Under each condition of 0 °, no water leakage occurred.

On the other hand, a branch pipe joint made of hard vinyl chloride was prepared according to a conventional method. As the two-part bonding agent, a putty-like main agent and a curing agent of an epoxy-based bonding agent were kneaded by hand and mixed until sufficiently dispersed. Approximately 400 g of the joining agent was uniformly applied to the inner surface (joining surface) of a rigid polyvinyl chloride branch pipe joint, and the branch pipe joint was brought into contact with a predetermined portion around the opening 1a of the main pipe 1 and pressed down.

Both sides of the joint portion of the branch pipe joint were firmly tightened with a number line, respectively, and left for one week in this state to be cured. Thereafter, a special adhesive was applied to the outer peripheral surface of the insertion portion of the branch pipe, and the branch pipe was inserted into the branch pipe joint and set.

When a water leakage test was conducted in the same manner as in the above example, no water leakage occurred when the angle θ of the branch pipe was 0 °, but when the angle θ was set to 5 °, the joint surface peeled off and water leakage occurred. Was.

[0055]

According to the present invention, in the event that undesired subsidence of the ground occurs, stress is concentrated on the connection portion between the branch pipe and the main pipe, and separation of the joint surface is prevented. Unknown water intrusion can be prevented.

Further, when connecting the main pipe and the branch pipe, the work of attaching the branch pipe does not require skill or a high degree of attention. In addition, when the branch pipe joint is attached to the main pipe, when an error or a deviation occurs between the mounting direction of the branch pipe joint and the direction of the target branch pipe, the error or the deviation can be easily corrected.

In addition, it is possible to prevent water leakage and unknown water intrusion due to difficulty in securing the water blocking surface. Further, as in the case of using a two-component bonding agent, it is possible to prevent the time required for the construction from being lengthened, and to easily perform the construction in a short time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a connection structure according to an embodiment of the present invention, and is a cross-sectional view obtained by cutting the entire connection structure along a diametrical cross section of a main pipe 1. FIG.

FIG. 2 is a cross-sectional view obtained by cutting the connection structure of FIG. 1 along a diametrical cross section of the main pipe 1 (a front view is shown for a branch pipe 13).

FIG. 3 is a front view showing the entire connection structure of FIGS. 1 and 2;

FIG. 4 is a cross-sectional view of the same connection structure as above, taken along the length direction of the main pipe 1;

FIG. 5 is a front view schematically showing a state in which the connection structure is subjected to a water leakage test.

FIG. 6 shows a branch pipe 1 when the connection structure is subjected to a water leakage test.
3 is a side view showing a state where the center line C of FIG. 3 is inclined by θ with respect to an initial position B.

FIG. 7 is a front view showing a conventional connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 1a Opening of main pipe 2 Tightening band (member for fixing a joint main body) 3 Joint main body 4 Cylindrical part 5 Main body covering part 6 Core material 7 Cylindrical core material 8 Projection 9 Projection for preventing intrusion of branch pipe Reference Signs List 10 annular projection provided on inner surface side of cylindrical portion 11 space between annular projections 13 branch pipe 14 layered water-stop material 15 fastening band (branch fixing member) 18 water leakage test container B initial position C branch pipe 13 Center line θ after tilting Angle of inclination of branch pipe 13

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideaki Takahashi 3-4-1-11 Sakaemachi, Soka City, Saitama Prefecture (56) References JP-A-5-196186 (JP, A) JP-A-5-65989 (JP, A) Shokai Sho 55-68776 (JP, U) Shokai Hei 3-32293 (JP, U) Shokai Hei 3-86291 (JP, U) Japanese Patent Publication 55-29222 (JP, B2) Kohei 4-30480 (JP, Y2) U.S. Pat. No. 4,963,397 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 41/02 F16L 47/02

Claims (8)

(57) [Claims] 1. A connection structure between a main pipe and a branch pipe, comprising: a joint main body having a main pipe coating portion and a tubular portion; a joint main body fixing member; and a branch pipe fixing member. The covering portion is composed of a plate-shaped core material made of a rigid material and an elastic material that embeds the core material, and the core material is previously formed.
The main pipe is bent to conform to the shape of the outer peripheral surface, the branch pipe is inserted into the tubular portion, and the branch pipe is fixed to the joint body by the branch pipe fixing member, A part of the main pipe is covered with the main pipe coating part, and the main pipe coating part is fastened to the main pipe by the joint body fixing member, and the core material is
The elastic pressure is applied by the tightening pressure of the joint body fixing member.
A connection structure between a main pipe and a branch pipe , wherein a conductive material is pressure-bonded to an outer peripheral surface of the main pipe. 2. The main pipe and the branch pipe according to claim 1, wherein an annular projection is formed on an inner surface of the tubular portion, and the annular projection is in contact with an outer surface of the branch pipe. Connection structure. 3. The main pipe and the branch pipe according to claim 1, wherein the cylindrical portion is formed of a cylindrical core material made of a rigid material and an elastic material containing the core material. And connection structure. 4. The method according to claim 1, wherein a layered water-stopping material is sandwiched between the outer peripheral surface of the main pipe and the inner peripheral surface of the main pipe covering portion, and is pressure-bonded. Connection structure between the main pipe and the branch pipe described in the paragraph. 5. The connection structure between a main pipe and a branch pipe according to claim 4, wherein the water-stopping material is a butyl rubber-based adhesive tape. 6. The main pipe and the branch pipe according to claim 1, wherein the joint body fixing member is a tightening band crimped along an outer peripheral surface of the main pipe. And connection structure. 7. The method according to claim 1, wherein a layered waterproof material is sandwiched between an outer peripheral surface of the branch pipe and an inner peripheral surface of the tubular portion, and is crimped. Connection structure between main pipe and branch pipe as described. 8. The method according to claim 1, wherein a protrusion for preventing the branch pipe from entering the inside of the main pipe is provided inside the cylindrical portion. , Connection structure between main pipe and branch pipe.