JP2008185093A - Branch pipe joint device and branch pipe connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch pipe joint device allowing easy mounting of a branch pipe on a ribbed pipe while preventing the leakage or entry of water from a gap between the installation faces of the ribbed pipe and a saddle joint, and to provide a branch pipe connection structure. <P>SOLUTION: A sleeve 3 is formed of a rubber material in an inner-and-outer double layer structure where the rubber hardness of an inner layer 3a is smaller than the rubber hardness of an outer layer 3b and the rubber hardness of the outer layer 3b is greater than the rubber hardness of a saddle supporting portion 4a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a branch joint device and a branch pipe connection structure for attaching a branch pipe to a ribbed pipe used for sewers and the like.

Conventionally, sewers buried underground include a ribbed pipe formed of vinyl chloride and the like, and a branch pipe connected to the ribbed pipe in a state of branching from the ribbed pipe. The drainage discharged from the pipe or the like passes through the branch pipe and flows out into the ribbed pipe. As shown in FIG. 9, the branch pipe joint device 103 generally used for connecting the branch pipe 102 to the ribbed pipe 101 includes a saddle joint 104 and a band member 105. The saddle joint 104 includes a saddle support 104a installed around the branch hole 101a on the outer peripheral surface of the ribbed tube 101 having a branch hole 101a that opens radially outward, and the ribbed tube 101 from the saddle support 104a. And a cylindrical connecting pipe portion 104b extending radially outward. Then, in the state where the saddle joint 104 is installed on the ribbed tube 101 described above, the band member 105 is tightened from the outer periphery to the inside of the diameter to fix the saddle joint 104 to the ribbed tube 101 (for example, Patent Document 1).
JP 2002-4397 A

However, in the branch pipe joint device 103 of Patent Document 1, when the saddle joint 104 is attached to the ribbed pipe 101, it is necessary to form the saddle support portion 104a in accordance with the shape of the adjacent annular rib. There is a problem that the cost increases and the installation work of the branch pipe 102 becomes complicated. Further, if the structure of the saddle support 104a is complicated, a slight gap is likely to be formed on the installation surface between the saddle support 104a and the ribbed tube 101, so that water inside the ribbed tube 101 leaks from this gap. There was also a problem that water from the outside entered.
The present invention has been made in view of such circumstances, and it is possible to easily attach the branch pipe to the ribbed pipe, and water leaks from the gap between the installation surfaces of the ribbed pipe and the saddle joint. It is an object of the present invention to provide a branch pipe joint device and a branch pipe connection structure that can prevent water or water from entering.

In order to achieve the above object, the present invention takes the following technical means.
A branch pipe coupling device for a ribbed pipe for connecting an end of a branch pipe to a branch hole formed in a middle part of a ribbed pipe, and having an internal hole having substantially the same diameter as the branch hole. A sleeve wound around the outer peripheral edge of the annular rib of the ribbed tube in a state in which the inner hole is made to correspond to the branch hole, a saddle support portion having a connection hole having substantially the same diameter as the inner hole, and the saddle support portion A saddle joint having a connecting pipe portion protruding integrally from an edge on the side of the connecting hole and having a connecting port of the branch pipe, and disposed on the outer peripheral surface of the sleeve so that the connecting hole corresponds to the inner hole A band member for pressing the saddle support portion pressed against the inside diameter of the ribbed tube, and the sleeve has a lower inner layer rubber hardness than an outer layer rubber hardness, and the outer layer rubber hardness is lower than the saddle support portion. Greater than the hardness of It is characterized by comprising a rubber material had inner and outer two-layer structure.

  Further, the branch pipe connection structure for the ribbed pipe of the present invention includes a ribbed pipe in which a branch hole is formed in the middle in the axial direction, and the branch pipe installed at a corresponding portion of the branch hole in the outer peripheral portion of the ribbed pipe. It is characterized by comprising a joint device and a branch pipe connected to the connection port of the saddle joint constituting the branch pipe joint device.

According to the branch pipe coupling device and the branch pipe connection structure, the saddle support portion is installed on the outer peripheral surface of the sleeve so that the connection hole corresponds to the inner hole, and the shape of the annular rib as in the related art Therefore, it is not necessary to form a saddle joint in accordance with this, and the branch pipe can be easily attached.
Further, since the sleeve is formed of a rubber material having an inner and outer two-layer structure in which the rubber hardness of the inner layer is smaller than the rubber hardness of the outer layer, when the sleeve is wound around the ribbed tube, the inner layer rubber of the sleeve having a lower rubber hardness is In order to close the outer periphery of the ribbed tube without any gap while entering between adjacent annular ribs, water leaks from the installation surface of the conventional ribbed tube and the saddle support, or water enters. Can be prevented.
Further, even when the sleeve wound around the outer periphery of the ribbed tube is strongly tightened on the inner diameter side by the band member, the rubber of the outer layer of the sleeve is large in hardness and has sufficient stress against the force on the inner diameter side. Therefore, it is possible to prevent the rubber of the inner layer from excessively entering between the adjacent annular ribs and causing a gap between the inner peripheral surface of the sleeve and the outer peripheral edge of the annular rib.
Further, since the rubber hardness of the outer layer of the sleeve is larger than the hardness of the saddle support portion and the rubber of the outer layer of the sleeve has sufficient stress against the force inward of the diameter, the saddle support portion can be stably Can be attached to the sleeve.

The sleeve is made of a rectangular plate having a pair of circumferential sides substantially corresponding to the outer circumferential length of the ribbed tube and a pair of axial sides perpendicular to the circumferential side, and the pair of axial directions It is preferable that a semicircular recess that forms the internal hole is formed on the side when the pair of axial sides are joined to each other.
In this case, since the semicircular recess that constitutes the internal hole is formed in the pair of axial sides when the pair of axial sides are joined to each other, the semicircular recess is not formed. Compared to the case, the length of the joint portion between the pair of axial sides can be shortened. For this reason, a possibility that water may leak from the joint portion can be reduced.

  Moreover, it is preferable that the joint part which consists of a dovetail and dovetail groove | channel extended in the longitudinal direction of this fore end face is formed in the end face of a pair of axial direction side in the said sleeve. In this case, the sleeve can be easily wound around the ribbed tube by sliding the dovetail and the dovetail groove formed in the longitudinal direction of the small edge surface of the pair of axial sides.

  The pair of axial sides of the sleeve may be joined to each other by a binding band member. In this case, the sleeve can be easily wound around the ribbed tube by using a highly versatile binding band member.

  According to the present invention, it is possible to easily attach the branch pipe to the ribbed pipe, and it is possible to prevent water from leaking or intruding from the gap between the installation surfaces of the ribbed pipe and the saddle joint. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partially omitted front view showing a branch pipe connection structure J according to an embodiment of the present invention. FIG. 2 is a sectional view showing the sleeve of FIG. As shown in FIG. 1, the branch joint device 6 includes a saddle joint 4 for connecting the end of the branch pipe 2 to the ribbed pipe 1, and a tubular shape interposed between the ribbed pipe 1 and the saddle joint 4. And a band member 5 that tightens the sleeve 3 and the saddle joint 4 from the outer periphery to the inner diameter in a state where the sleeve 3 and the saddle joint 4 are attached to the outer periphery of the ribbed tube 1.

  The ribbed tube 1 is made of vinyl chloride or the like. A large number of annular ribs 1b are formed on the outer periphery of the tube 1 at equal intervals, and a branch hole 1a that opens radially outward is provided in the middle.

  As shown in FIGS. 1 and 2, the sleeve 3 is a cylindrical sleeve made of rubber having a two-layer structure of an outer layer 3b and an inner layer 3a, and has an inner hole 3f that opens radially outward in the middle part thereof. Yes. Further, the sleeve 3 is formed on the outer periphery of the ribbed tube 1 in a state where the inner hole 3f corresponds to the branch hole 1a and the inner peripheral surface thereof is in contact with the outer peripheral edge of the adjacent annular rib 1b of the ribbed tube 1. It is wound. The inner diameter of the internal hole 3f is designed to be substantially the same as the inner diameter of the branch hole 1a so as not to hinder the flow of water passing through the branch hole 1a. Note that various rubbers such as styrene butadiene rubber (SBR), for example, are used as the rubber material constituting the sleeve 3 and are manufactured by integral vulcanization molding or the like.

  The inner layer 3a of the sleeve 3 is made of rubber having a hardness lower than that of the outer layer 3b. That is, the rubber hardness (JIS K 6253 durometer type A (Shore A)) is 30 to 40 (thickness 2.0 to 6.0 mm) for the inner layer 3a of the sleeve 3, and 80 (thickness 3.0 to 6.mm) for the outer layer 3b. 0 mm). Thus, since the rubber hardness of the inner layer 3a of the sleeve 3 is smaller than the rubber hardness of the outer layer 3b, when the sleeve 3 is wound around the ribbed tube 1, the rubber of the inner layer 3a of the sleeve 3 becomes adjacent to the annular rib 1b. In this state, the outer periphery of the ribbed tube 1 is closed without a gap. For this reason, it is possible to prevent internal water from leaking or external water from entering from the installation surface of the inner peripheral surface of the sleeve 3 and the outer peripheral edge of the annular rib 1b.

  Furthermore, since the outer layer 3b of the sleeve 3 has a rubber hardness greater than that of the inner layer 3a, the sleeve 3 wound around the outer periphery of the ribbed tube 1 is strongly tightened radially inward by the band member 5. However, it has sufficient stress for the force to the inside of the diameter. For this reason, the rubber of the inner layer 3a enters excessively between the adjacent annular ribs 1b in the ribbed tube 1, and a gap is generated between the inner peripheral surface of the sleeve 3 and the outer peripheral edge of the annular rib 1b. It comes to prevent.

  FIG. 3 is a side view showing the sleeve of FIG. 1. 4 is a side view showing a joint portion of the sleeve of FIG. 3, and FIG. 5 is a plan view showing the joint portion of the sleeve. As shown in FIGS. 3 and 4, the sleeve 3 is formed with a joint 3 c having a substantially arc-shaped cross section along the longitudinal direction of the ribbed tube 1 at the upper part (upper side in FIG. 3). The joint 3c is made of the same material as the inner layer 3a, and two adjacent annular ribs 1b are provided so that the inner peripheral surface thereof is in contact with the outer peripheral edge of the adjacent annular rib 1b in the ribbed tube 1. It is designed to have an appropriate length longer than the distance L between the outer peripheral edges, for example, 25 to 80 mm.

  As shown in FIG. 4, the joint 3c is formed with an ant portion 3d having a trapezoidal cross section and an ant groove portion 3e corresponding to the shape of the ant portion 3d. 5A, the sleeve 3 includes a pair of circumferential sides 3h substantially corresponding to the outer peripheral length of the ribbed tube 1, and a pair of axial sides 3i orthogonal to the circumferential side 3h. A semicircular recess 3g that forms an internal hole 3f when the pair of axial sides 3i are joined to each other is formed on the pair of axial sides 3i. The dovetail portion 3d and the dovetail groove portion 3e are slid and joined in the longitudinal direction, whereby the sleeve 3 is wound around the outer periphery of the ribbed tube 1 as shown in FIG. Further, in the trapezoidal shape in the ant portion 3d, the width of the bottom surface B is 7.0 mm, the width of the top surface A facing the bottom surface B is 4.0 mm, and the width of the height C is 5.0 mm. ing. The upper surface A has a length obtained by dividing the thickness of the sleeve 3 into three equal parts.

  As shown in FIG. 1, the saddle joint 4 is installed on the outer periphery of the sleeve 3 fitted to the outer peripheral edge of the annular rib 1 b of the ribbed tube 1, and is connected to a position corresponding to the inner hole 3 f in the sleeve 3. A saddle support portion 4a having a substantially arc-shaped cross section in which a hole 4c is formed, and a cylindrical connection pipe portion 4b that protrudes radially outward of the ribbed tube 1 from the edge of the connection hole 4c in the saddle support portion 4a. It consists of and. And the branch pipe 2 is connected in the state substantially orthogonal to the pipe 1 with a rib by fitting the edge part of the branch pipe 2 to the inner periphery of the connection port of the connection pipe part 4b of the saddle joint 4. FIG. The inner diameter of the ribbed tube 1 is designed to be larger than the inner diameter of the branch tube 2, and the inner diameter of the branch hole 1 a formed in the ribbed tube 1 is designed to be larger than the outer diameter of the branch tube 2. Furthermore, the inner diameter of the connection hole 4c is substantially the same as the inner diameter of the internal hole 3f in the sleeve 3, and is designed so as not to obstruct the flow of water passing through the internal hole 3f.

  The saddle joint 4 is made of rubber having a rubber hardness of 45-60, and is more flexible than the rubber of the outer layer 3b of the sleeve 3 having a rubber hardness of 80. For this reason, the saddle joint 4 is closely joined to the outer periphery of the sleeve 3 wound around the outer periphery of the ribbed tube 1 without any gap. For this reason, it is possible to prevent internal water from leaking from the joint surface between the saddle support 4a and the sleeve 3 or external water from entering.

As shown in FIG. 1, the band member 5 is attached to the outer periphery of the saddle support portion 4 a in a state where the saddle joint 4 is installed on the outer periphery of the sleeve 3 wound around the ribbed tube 1. The saddle joint 4 is firmly fixed to the outer periphery of the ribbed tube 1 by tightening the saddle support portion 4a to the inside of the diameter of the ribbed tube 1. The band member 5 has a fixing part 5a made of stainless steel or hard resin having a circular arc shape corresponding to the saddle support part 4a. The fixing part 5a is installed on the outer periphery of the saddle support part 4a. This prevents the saddle support 4a from being damaged by earth and sand. In addition, by increasing the tightening strength of the saddle support portion 4a by the band member 5, the saddle joint 4 can be more stably fixed to the ribbed tube 1, and the seismic resistance of the branch joint device 6 can be improved. it can.
In addition, the band member 5 may be installed in the outer periphery of the saddle support part 4a, without providing the fixing | fixed part 5a.

  FIG. 6 is an attachment process diagram showing the branch joint device 6 according to the present invention. The branch pipe coupling device 6 of the present invention is attached to the ribbed pipe 1 in the order of (a) to (d) of FIG. Since the branch joint device 6 shown in the figure is the same as the above-mentioned branch joint device 6, the same reference numerals are given to the respective members. First, as shown in FIG. 5A, the cylindrical sleeve 3 made of the rubber having the two-layer structure of the outer layer 3b and the inner layer 3a described above is replaced with the procedure shown in FIG. The grooved portion 3e is slid and joined in the direction of the arrow D in the longitudinal direction), and the ribbed tube is in close contact with the outer peripheral edge of the adjacent annular rib 1b of the ribbed tube 1 without a gap. 1 is wound around the outer periphery. At this time, as shown in (b), the branch hole 1a formed in the middle part of the ribbed tube 1 and the internal hole 3f of the sleeve 3 are installed so as to correspond to each other. 3 so that it is not inhibited. Next, as shown in (c), the saddle support 4 a of the saddle joint 4 is installed on the outer periphery of the sleeve 3 with the connection hole 4 c corresponding to the internal hole 3 f of the sleeve 3. The inner diameter of the connection hole 4c is substantially the same as the inner diameter of the internal hole 3f, so that the saddle joint 4 does not hinder the flow of water passing through the internal hole 3f. Finally, as shown in (d), the band member 5 is fastened to the outer periphery of the saddle support portion 4a in a state where the saddle joint 4 is installed on the outer periphery of the sleeve 3 wound around the ribbed tube 1. And the branch pipe 2 is connected in the state substantially orthogonal to the pipe 1 with a rib by fitting the edge part of the branch pipe 2 to the inner periphery of the connection port of the connection pipe part 4b of the saddle joint 4. FIG.

FIG. 7 is a side view of a sleeve showing another embodiment of the present invention, and FIG. 8 is a plan view showing the sleeve. As shown in these drawings, the sleeve 3 is wound around the outer periphery of the ribbed tube 1 by joining the pair of axial sides 3 i of the sleeve 3 to each other by the binding band member 7.
With this structure, there is no need to provide the joint 3c composed of the dovetail part 3d and the dovetail part 3e as shown in FIG. 4, and the rubber material of the joint 3c needs to be the same material as the inner layer 3a. Nor. Accordingly, the sleeve 3 is formed so as to straddle the binding band member 7 over the joining surface 3j in a state in which the small face (axial side 3i) of the sleeve 3 having a two-layer structure consisting only of the inner layer 3a and the outer layer 3b is in contact with the joining surface 3j. The sleeve 3 can be easily wound around the ribbed tube 1 simply by attaching to the tube.

  In the present invention, the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the present invention. In the above embodiment, the band member 5 is fastened to the saddle joint 4 installed on the outer periphery of the sleeve 3 wound around the outer periphery of the ribbed tube 1. Not limited to 5, any member or method for reducing the diameter inward can be used.

It is a partial notation front view which shows the branch pipe connection structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the sleeve of FIG. It is a side view which shows the sleeve of FIG. It is a side view which shows the junction part of the sleeve of FIG. It is a top view which shows the junction part of a sleeve. It is an attachment process figure which shows the branch pipe coupling apparatus which concerns on this invention. It is a side view of the sleeve which shows other embodiment of this invention. It is a top view which shows the sleeve of FIG. It is a front view which shows the conventional branch pipe connection structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ribbed pipe 1a Branch hole 1b Annular rib 2 Branch pipe 3 Sleeve 3a Inner layer 3b Outer layer 3c Joint part 3d Dovetail part 3e Dovetail part 3f Inner hole 3g Semicircular recessed part 3h Circumferential side 3i Axial side 4 Saddle joint 4a Saddle support Part 4b Connection pipe part 4c Connection hole 5 Band member 5a Fixing part 6 Branch pipe joint device 7 Bundling band member J Branch pipe connection structure

Claims (5)

A branch joint device for a ribbed pipe for connecting an end of the branch pipe to a branch hole formed in a midway part of the ribbed pipe,
An inner hole having substantially the same diameter as the branch hole, and a sleeve wound around the outer peripheral edge of the annular rib of the ribbed tube in a state in which the inner hole corresponds to the branch hole;
A saddle having a saddle support portion having a connection hole having substantially the same diameter as the inner hole, and a connection pipe portion projecting integrally from an edge of the saddle support portion on the connection hole side and having a connection port of the branch pipe Fittings,
A band member for pressing the saddle support portion disposed on the outer peripheral surface of the sleeve so that the connection hole corresponds to the inner hole against the inside diameter of the ribbed tube;
A branch pipe joint for a ribbed pipe, wherein the sleeve is made of a rubber material having an inner and outer two-layer structure in which the inner layer has a lower rubber hardness than the outer layer and the outer layer has a larger hardness than the saddle support portion. apparatus.   The sleeve is made of a rectangular plate material having a pair of circumferential sides substantially corresponding to the outer peripheral length of the ribbed tube and a pair of axial sides orthogonal to the circumferential side, and the pair of axial sides The branch joint device for a ribbed tube according to claim 1, wherein a semicircular recess that constitutes the internal hole is formed when the pair of axial sides are joined to each other.   The branch joint apparatus for ribbed pipes according to claim 2, wherein a joint portion composed of an ant and an ant groove extending in the longitudinal direction of the small face is formed on the small face of the pair of axial sides of the sleeve.   The branch joint device for a ribbed tube according to claim 2, wherein a pair of axial sides of the sleeve are joined to each other by a binding band member. A ribbed tube with a branch hole formed in the middle in the axial direction;
The branch pipe coupling device according to any one of claims 1 to 4, which is installed at a corresponding portion of the branch hole in the outer peripheral portion of the ribbed tube,
A branch pipe connection structure for a ribbed pipe, comprising: a branch pipe connected to a connection port of the saddle joint constituting the branch pipe joint device.

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