JP2006257731A - Manhole joint and pipe connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole joint which can set a plurality of main pipes lining the same in a lateral direction, and facilitates setting work. <P>SOLUTION: The manhole joint 1 has a saddle 11 which is archedly curved conforming to an external surface 80a of the manhole 80, and two cylinder portions 10 which each arranged so as to penetrate through an inside and an outside of a curved area of the saddle 11. The two cylinder portions 10 penetrate in directions almost in parallel with each other, and the two cylinder portions 10 are lined in a circumferential direction of a circular arc of the saddle 11. Then the main pipes 81 are connected to the respective cylinder portions 10, in a manner being laterally arranged in parallel with each other. Further the saddle 11 functions to positively seal the manhole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a manhole joint that connects a manhole and a main pipe for introducing or discharging sewage passing through the manhole.

Sewage discharged from ordinary houses and the like is treated at a sewage treatment plant, but sewage discharged from each house and the like once flows into the public sewer and flows to the sewage treatment plant.
And the public sewer has a pipeline formed by a plurality of main pipes, and a manhole is provided in the middle of the pipeline. Moreover, the branch pipe connected with a general house etc. is connected with the main pipe, and sewage flows from the branch pipe to the main pipe.
Since the main is buried underground, people are put in manholes during inspections.

The manhole has a cylindrical shape with an opening at the top and a bottom at the bottom. Normally, the main pipe is connected near the bottom of the manhole.
If the main pipe connection is not connected near the bottom, such as when piping on slopes, etc., an internal auxiliary pipe with the same diameter as the main pipe is provided inside the manhole to prevent free fall of sewage. In addition, the scattering of sewage in the manhole and the wear of the bottom of the manhole are prevented.

And the connection part of a main pipe and a manhole needs a seal | sticker so that the waste_water | drain etc. in a pipe | tube may not leak outside. Therefore, a manhole joint that can be connected to the main pipe and the manhole is used, and the manhole joint and the pipe, and the manhole joint and the manhole are connected so that the sealing work can be easily performed.
Patent Document 1 discloses a structure using such a manhole joint.

In addition, there are roughly two types of seal structures for manhole joints with manholes. As shown in FIG. 5, the first structure seals between the outer surface of the manhole joint 90 and the inner peripheral wall 85 a of the through hole 85 of the manhole 80 with a bonding agent 86 or the like.
As shown in FIG. 6, the second structure uses a trapezoidal manhole joint 91 and seals between the crown portion 92 of the manhole joint 91 and the outer surface 80 a of the manhole 80. The shape of the club portion 92 is deformed along the outer surface 80a of the cylindrical manhole 80.
JP-A-7-317111

The thickness of the main pipe 81 is selected according to the amount of sewage flowing inside, but the main pipe 81 having a certain thickness or more may not be buried depending on the conditions of the place where the main pipe 81 is buried. If the main pipe 81 is too thick, the inner sub pipe installed inside the manhole 80 also needs to be thickened. If the inner sub pipe needs to be installed, Therefore, there is a limit to making the main pipe 81 thick. In such a case, there is a method in which two main pipes 81 are installed in parallel so that a large amount of sewage flows.
In this case, there are a method in which the positional relationship between the two main pipes 81 is vertically arranged so as to be in the vertical direction, and a method in which the positional relationship is horizontally arranged so as to be in the horizontal direction.

When the main pipes are installed vertically, the upper main pipe 81 is separated from the bottom of the manhole, so that the above-described inner sub pipe needs to be provided. Also, the branch pipe connected to the main pipe needs to be connected to the upper part of the main pipe, but when connecting the branch pipe to the lower main pipe, the upper main pipe gets in the way and is difficult to install. The degree of freedom of connection is small.
In addition, when the main pipe is laid and backfilled, only the lower main pipe is buried and the upper main pipe is placed and buried in order to prevent unfilling between the upper and lower main pipes. It was necessary to carry out the backfilling work twice.

When the main pipes are installed side by side, the inner / sub pipes are not required to be installed unless it is a special case such as an inclined land, and backfilling after laying can be performed at once.
However, if the conventional manhole joints are simply provided at two locations in the lateral direction, there are the following problems.

  As shown in FIG. 7, the through holes 85 of the manhole 80 are provided at two locations so that the penetrating directions are parallel to each other, and a manhole joint 94 is inserted into each of the through holes 85, and the inner peripheral wall of the through hole 85 There is a method of sealing between 85a and the outer surface of the manhole joint 94. In this method, the penetrating direction of the through hole 85 is deviated from the direction toward the central axis of the manhole 80, and the seal between the inner peripheral wall 85a of the through hole 85 and the manhole joint 94 tends to be insufficient.

  Further, as shown in FIG. 8, two through holes 85 are provided in the direction in which the penetrating direction is directed toward the center of the cylinder of the manhole 80, and the main pipe 81 is connected by using two manhole joints 95. There is a method of performing a seal between the 95 skirt portion 92 and the outer surface 80a of the manhole 80. In this method, the sealing property is better than the above-described method, but since the penetrating directions of the two manhole joints 95 are not parallel to each other, it is necessary to use the bent pipe 96 so that the main pipes 81 are parallel to each other. is there. Further, the interval between the main pipes 81 becomes long, and when laying the main pipe 81, it is necessary to widen the excavation width, which increases the number of work steps.

  Therefore, an object of the present invention is to provide a manhole joint that can install a plurality of main pipes side by side and is easy to install.

  And invention of Claim 1 for achieving an above-mentioned object is provided so that it may penetrate the inner and outer of the curve part which curves in the shape of an arc according to the outer surface of a manhole, and the above-mentioned curve part, A cylindrical portion that can connect a main pipe connected to a manhole, and a plurality of the cylindrical portions are provided, and the through directions of the cylindrical portions are substantially parallel to each other. It is a manhole joint characterized by being arranged in the peripheral direction of the circular arc of a part.

  According to the first aspect of the present invention, there are a plurality of cylindrical portions to which the main pipe can be connected, the through-directions of the cylindrical portions are substantially parallel, and the arrangement of the cylindrical portions is an arc of the club portion. Since this manhole joint is used to connect the manhole and the main pipe, the main pipes can be connected in a side-by-side arrangement, and the sealing performance is improved by the skirt. be able to.

The invention according to claim 2 is the manhole joint according to claim 1, wherein the angle formed by the central axis of the curvature of the club portion and the center line of the cylindrical portion is substantially a right angle.
Here, the central axis of the curve of the club part is an axis inside the curve and passing through the center of the arc of the club part. The center line of the cylindrical portion is an imaginary line that passes through the center of the cylinder and is parallel to the penetration direction.

According to the second aspect of the present invention, since the angle formed by the central axis of the curve of the club portion and the center line of the cylindrical portion is substantially a right angle, the manhole and the main pipe are connected using this manhole joint. Then, the main pipe can be arranged so as to extend in a substantially horizontal direction, and it is not necessary to use a bent pipe.

  According to a third aspect of the present invention, the cylindrical portion is provided at two locations, and the virtual intermediate line that is parallel to the center line of the cylindrical portion and is located between the center lines of the two cylindrical portions is The manhole joint according to claim 1, wherein the manhole joint has a positional relationship intersecting with the central axis of the curve.

  According to the third aspect of the present invention, the cylindrical portion is provided at two locations, and the virtual intermediate line in the middle of the center line of the cylindrical portion intersects with the central axis of the curve of the club portion. Therefore, the two cylindrical parts have a symmetrical positional relationship, and the balance with the manhole is good.

  A plurality of cylindrical portions having the same size can be used (claim 4).

  The invention according to claim 5 is a pipe connection structure in which the manhole and the main pipe are connected using the manhole joint according to any one of claims 1 to 4.

  According to the pipe connection structure of the fifth aspect, it is easy to install and the sealing property is good.

  By using the manhole joint of the present invention, a plurality of main pipes can be installed side by side, and the installation work is easy.

Hereinafter, specific examples of the present invention will be described.
A manhole joint 1 according to a first embodiment of the present invention is shown in FIGS. 1, 2, and 3, and is disposed between a manhole 80 and a main pipe 81 to connect the main pipe 81 to the manhole 80. Thus, the manhole 80 and the main pipe 81 are connected.

Then, as shown in FIG. 2, the pipe connection structure 5 is formed by the manhole joint 1, the manhole 80 and the main pipe 81, and a flow path through which sewage flows is formed between the main pipe 81 and the manhole 80. it can. The pipe connection structure 5 is buried in the ground.
In addition, the manhole 80 has an opening through which a person can enter, and is usually covered with a lid, and the bottom portion is sealed.

  A branch pipe 82 is connected to the main pipe 81. As shown in FIG. 2, the branch pipe 82 is positioned above the main pipe 81, and has a structure that allows sewage flowing through the branch pipe 82 to flow to the main pipe 81.

As shown in FIG. 3, the manhole joint 1 has two cylindrical portions 10 and a crown portion 11. The cylindrical portion 10 is cylindrical and has an outer opening 15 and an inner opening 16. The round portion 11 has a curved plate shape, and this curvature is matched to the curvature of the outer surface 80 a of the manhole 80.
The cylindrical portion 10 is fixed so as to penetrate the pillow portion 11, the outer opening 15 is located outside the curve of the pillow portion 11, and the inner opening 16 is located inside the curve of the pillow portion 11. is doing.

The cylindrical part 10 is a part to which the main pipe 81 is inserted and connected.
As shown in FIGS. 3 and 4, a seal portion 18 is provided near the outer opening 15 of the cylindrical portion 10. The seal portion 18 protrudes outward in a circumferential shape, forms a circumferential concave portion on the inner side, and a ring-shaped rubber member 18a is disposed in this portion. Then, by inserting the main pipe 81 into the cylindrical portion 10, the rubber member 18 a comes into close contact with the outer periphery of the main pipe 81, and the cylindrical portion 10 and the main pipe 81 can be sealed.

As shown in FIGS. 3 and 4, the shape of the inner opening 16 of the cylindrical portion 10 is such that the end surface of the manhole 80 does not protrude into the manhole 80 when attached to the manhole 80. It is processed into a shape according to.
The shape of the outer opening 15 of the cylindrical portion 10 is a shape that is cut along a plane perpendicular to the center lines L1 and L2, which are imaginary lines at the center in the penetration direction.

The manhole joint 1 is provided with two cylindrical portions 10. And the magnitude | size of these two cylindrical parts 10 is the same, and the main pipe 81 connected to each cylindrical part 10 is also the same thickness.
As shown in FIG. 4A, the center lines L1 and L2 in the penetrating direction of the two cylindrical portions 10 are parallel to each other, and the penetrating directions of the two cylindrical portions 10 are parallel. Further, as shown in FIG. 4B, an angle θ3 formed by the center lines L1 and L2 in the penetration direction and a center axis Z of the curve of the club portion 11 described later is substantially a right angle.

  Further, as shown in FIG. 4A, a virtual intermediate line L3, which is an intermediate virtual line between the center lines L1 and L2 in the penetrating direction of the two cylindrical portions 10, is a central axis Z of the curvature of the club portion 11. The positions of the two cylindrical portions 10 are symmetrical. The straight line connecting the center of the inner opening 16 and the central axis Z and the center lines L1 and L2 are inclined at the inclination angles θ1 and θ2, but the inclination angle θ1 and the inclination angle θ2 have the same relationship. ing.

Further, as shown in FIG. 3, the rounded portion 11 is formed by curving a long side of a rectangular plate. Then, the arrangement direction of the two cylindrical portions 10 fixed to the crown portion 11 is arranged to be the circumferential direction of the curvature of the crown portion 11.
And if the manhole joint 1 is attached to the manhole 80 installed with the axial direction of the cylinder as the vertical direction, the cylindrical part 10 is in a state of being aligned in the horizontal direction, and the axial direction of the cylindrical part 10 is the horizontal direction.

  The material of the manhole joint 1 is a thermoplastic resin such as polyvinyl chloride resin or polyethylene resin, but materials other than these materials can be used.

  In addition, the manhole joint 1 is formed by bending a plate-like rectangular plate to form a pillow portion 11, forming a through hole 11 a at a position where the cylindrical portion 10 is fixed thereto, and attaching the cylinder to be the cylindrical portion 10 to the cylinder portion 10. It is inserted into the through-hole 11a and manufactured by joining the crown portion 11 and the cylindrical portion 10 together.

When connecting the main pipe 81 to the manhole 80 using the manhole joint 1, first, the manhole joint 1 is fixed to the manhole 80 and the main pipe 81 is connected to the manhole joint 1.
As shown in FIG. 3, the manhole 80 is provided with a through hole 85. The through hole 85 is formed by drilling, and the size of the through hole 85 is a size that allows the two cylindrical portions 10 to be inserted simultaneously and is smaller than the pillow portion 11.

The manhole joint 1 and the manhole 80 are fixed by disposing a bonding agent 86 between them. Specifically, between the crown portion 11 of the manhole joint 1 and the surface of the manhole 80, or between the surface of the cylindrical portion 10 inside the curve of the crown portion 11 and the inner peripheral wall 85a of the through hole 85 of the manhole 80. The bonding agent 86 is filled. As an example of the bonding agent 86, mortar or the like can be used.
Further, the bonding agent 86 serves not only to fix the manhole joint 1 and the manhole 80 but also serves as a seal between the manhole joint 1 and the manhole 80.

When the manhole No. 1 is used as the manhole 80 and two main pipes 81 having a nominal diameter of 200 mm are connected to the manhole 80, the following manhole joint 1 is used.
The round part 11 is prepared by curving the curvature (R = 525 mm) of the outer surface 80 a of the manhole 80, and the cylindrical part 10 having an inner diameter slightly larger than the outer diameter of the main pipe 81 is prepared and attached to the round part 11. .
Two holes 11a having a diameter substantially equal to the outer diameter of the cylindrical portion 10 are formed in the crown portion 11, and the interval between the through holes 11a is 269 mm (the arc length of the crown portion 11).

Then, the two cylindrical portions 10 are fixed to the pillow portion 11. The two cylindrical portions 10 are fixed so as to be parallel to each other. Further, as shown in FIG. 4, the inclination angles θ1 and θ2 of the two cylindrical portions 10 are set to 17 ° 11 ′, respectively, so that they are symmetrical.
Further, the inner opening 16 side of the cylindrical portion 10 is processed according to the radius (R = 450 mm) of the inner surface 80b of the manhole 80.
The manhole joint 1 of the present invention is sanded on the surface of the cylindrical portion 10 on the inner side of the crown portion 11. In this sanding process, predetermined sand is attached to the surface of the cylindrical portion 10 in advance to improve the adhesiveness of the bonding agent 86.

  When such a manhole joint 1 is used to connect the manhole 80 and the main pipe 81, the positional relationship between the manhole 80 and the manhole joint 1 is confirmed, and the manhole 80 is drilled to form a through hole 85. , And the manhole joint 1 is fixed to the manhole 80.

In the state where the manhole joint 1 is fixed, the cylindrical portion 10 on the inner opening 16 side is located in the through hole 85 provided in the manhole 80 as shown in FIG.
Since the main pipe 81 is inserted into each of the two cylindrical portions 10 of the manhole joint 1, the manhole 80 and the main pipe 81 are connected to each other, and the inside of the main pipe 81 and the inside of the manhole 80 are connected to each other. Is formed.

  Specifically, two or more manhole joints 1 are fixed to one manhole 80, and two main pipes 81 are connected to each manhole joint 1. The main pipe 81 connected to at least one manhole joint 1 is on the upstream side of the sewage, and the main pipe 81 connected to the other manhole joint 1 is on the downstream side of the sewage. The sewage can flow through 80 to the main pipe 81 on the downstream side.

  In the manhole joint 1 described above, the cylindrical portion 10 is provided at two locations, but it can also be provided at three or more locations. Moreover, the cylindrical part 10 can use a thing of a different magnitude | size.

It is the perspective view which showed a part of pipe connection structure of embodiment of this invention. It is the schematic diagram which showed the whole pipe | tube connection structure of embodiment of this invention. It is the disassembled perspective view which expanded the pipe connection structure shown in FIG. It is a figure which shows a part of pipe connection structure shown in FIG. 1, (a) is sectional drawing cut | disconnected in the surface of a horizontal direction, (b) is a side view. It is sectional drawing cut | disconnected by the surface of the horizontal direction which shows a part of pipe connection structure in a prior art. It is sectional drawing cut | disconnected by the surface of the horizontal direction which shows a part of pipe connection structure in a prior art. It is sectional drawing cut | disconnected by the surface of the horizontal direction which shows a part of pipe connection structure in a prior art. It is sectional drawing cut | disconnected by the surface of the horizontal direction which shows a part of pipe connection structure in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole joint 5 Pipe connection structure 10 Cylindrical part 11 Round part 80 Manhole 81 Main pipe L1, L2 Center line L3 Virtual intermediate line Z Center axis

Claims (5)

A circular part that curves in an arc shape in accordance with the outer surface of the manhole, and a cylindrical part that is provided so as to penetrate the inside and outside of the curved part of the circular part and that can be connected to the main pipe connected to the manhole. And
A manhole joint comprising a plurality of the cylindrical portions, the through-directions of the cylindrical portions being substantially parallel, and the arrangement of the cylindrical portions being arranged in the circumferential direction of the arc of the round portion.   2. The manhole joint according to claim 1, wherein an angle formed by a central axis of curvature of the round portion and a center line of the cylindrical portion is substantially a right angle.   Cylindrical parts are provided at two locations, and a virtual intermediate line that is parallel to the central line of the cylindrical part and located in the middle of the central lines of the two cylindrical parts intersects the central axis of the curvature of the club part. The manhole joint according to claim 1, wherein the manhole joint is in a positional relationship.   The manhole joint according to any one of claims 1 to 3, wherein the plurality of cylindrical portions have the same size.   A pipe connection structure in which a manhole and a main pipe are connected using the manhole joint according to claim 1.

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