JP2005023522A - Manhole joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole joint capable of improving workability, while securing watertightness, without causing deformation and damage by a creep. <P>SOLUTION: This manhole joint 10 includes a saddle 12 composed of vinyl chloride adhesive to a manhole wall 18, and a first short pipe 22 of similarly vinyl chloride is inserted into a pipe part 16 of the saddle 12. An O ring storage groove 24 is formed on an inner surface of the first short pipe 22, and an O ring 26 is stored in the groove. A polyethylenic second short pipe 28 of the same material as a sewer pipe is inserted into and held by the first short pipe 22 via this O ring 26. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole joint, and more particularly to a manhole joint for joining a sewage pipe made of, for example, a polyethylene pipe to a concrete manhole.
[0002]
[Prior art]
An example of this type of conventional manhole joint is disclosed in Patent Documents 1 to 3.
[0003]
In the synthetic resin joint of Patent Document 1, a synthetic resin granule made of the same material as the main body is attached to the outer peripheral surface of the joint main body to provide anti-slip irregularities. When using this joint to join a polyethylene pipe to a manhole, the adhering portion of the synthetic resin pipe joint is inserted into a hole provided in the manhole wall, and a mortar or the like is placed between the inner surface of this hole and the granule. Fill the filler and insert the polyethylene pipe into the rubber ring socket of the joint.
[0004]
The rubber manhole joint of Patent Document 2 has a structure in which a bent surface closes and connects one end surfaces of an outer cylinder and an inner cylinder, and when using this joint to join a sewer pipe to a manhole, a through hole in the manhole wall The outer circumference of the outer cylinder is brought into contact with the inner circumference of the inner cylinder and fixed with an enlarged band, and the outer circumference of the sewage main pipe is brought into contact with the inner circumference of the inner cylinder via a sleeve and fixed with the reduced diameter band.
[0005]
The pipe joint of Patent Document 3 includes a cylindrical main body and a flange, and a seal member and a cap member are interposed between the cylindrical main body and a sewer pipe inserted into the cylindrical main body. When joining the sewer pipe to the manhole using this joint, the cylindrical main body is fixed to the through hole of the manhole wall, the flange is bonded to the wall outer surface of the manhole wall, and the sewer pipe is inserted into the cylindrical main body.
[0006]
[Patent Document 1]
JP 2001-295111 A [Patent Document 2]
Japanese Patent Laid-Open No. 2002-332652 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-294846
[Problems to be solved by the invention]
In the prior art of Patent Document 1, when buried in the ground after construction, if the ground fluctuates or a repeated load is applied to the ground due to vibration by a passing vehicle, the mortar is basically weak in strength and adhesiveness. Due to its nature, the mortar filled in the gap between the outer surface of the joint and the through hole in the manhole wall is cracked or peeled off. As a result, the mortar is cracked and the water stoppage of the joint is lowered, or the mortar is peeled off at the interface with the joint or manhole, so that the adhesion of the joint is lowered.
[0008]
Moreover, since it takes time until the mortar is solidified, a temporary material for allowing the joint to stand and be fixed until the mortar dries must be used in order to prevent joint failure due to misalignment or oblique insertion of the joint. Therefore, this conventional technique has a problem that the workability is not good.
[0009]
In the prior art of Patent Document 2, since the joint is pressed and fixed to the manhole through-hole with the diameter expansion band, the diameter of the hole is not circular but is elliptical or the circle is distorted. The force with which the band presses the joint against the hole becomes uneven, a gap is formed between the joint and the hole, and the water tightness and the adhesion function between the manhole and the joint are lowered.
[0010]
In addition, at the joint between this manhole joint and the sewer main, the joint and the sewer main are tightened with a reduced-diameter band. There is also a problem that the fixing force to the pipe is weakened to cause a problem of water tightness, or the scavenging capacity is reduced due to deformation of the sewer main.
[0011]
In the prior art of Patent Document 3, the seal member provides water tightness between the pipe joint and the sewage pipe, and the connection angle of the sewage pipe to the pipe joint can be changed. Therefore, since the sealing member must maintain watertightness against the flatness of the sewer pipe due to this change in angle and earth pressure, the volume of the sealing member must be large and the compression rate must be increased. Therefore, the sewer pipe is deformed by a creep phenomenon by tightening with the seal member.
[0012]
Therefore, a main object of the present invention is to provide a manhole joint which is free from deformation or breakage due to creep or the like and can improve workability while ensuring water tightness.
[0013]
[Means for Solving the Problems]
This invention consists of the 1st resin which can adhere to a manhole wall, and has the inner surface which meets the outer surface of a manhole wall. At least one O-ring housing groove formed, an O-ring housed in the O-ring housing groove, and a second short tube made of a second resin that is longer than the first short tube and inserted through the first short tube. It is a manhole joint.
[0014]
[Action]
When, for example, a polyethylene sewage pipe is connected to a manhole using the manhole joint of the present invention, the shell is bonded to the manhole wall so that the inner surface of, for example, polyvinyl chloride is along the outer surface of the manhole wall. At this time, the O-ring is housed in the O-ring housing groove of the first short tube, and the second short tube is inserted into the first short tube via the O-ring. One end of the second short tube is inserted into the first short tube, and the other end protrudes from the first short tube to the outer surface side of the frame. The second short pipe is, for example, a polyethylene pipe, and the sewer pipe is connected to the protruding portion of the second short pipe, for example, by an EF joint.
[0015]
Because the manhole joint can be directly glued to the manhole wall, not only is there no need for fillers such as mortar and temporary materials that hold it until it hardens, but even if the shape of the through hole in the manhole wall is not a perfect circle, Watertightness can be secured between the joint and the manhole.
[0016]
Further, since the O-ring is accommodated in an O-ring accommodating groove formed on the inner surface of the first short pipe, and the O-ring provides water tightness between the first short pipe and the second short pipe, Even if the second short pipe is displaced due to fluctuation or the like, the O-ring can follow it and maintain the watertightness between the first short pipe and the second short pipe. Moreover, since the first short tube and the second short tube are connected by the O-ring, the second short tube can be expanded and contracted with respect to the first short tube, that is, the manhole.
[0017]
In addition, if the position of the O-ring is a portion inserted through the through hole of the manhole wall of the first short tube as in the embodiment, that is, the position of the O-ring receiving groove is within the thickness of the manhole wall. The portion of the second short tube that is inserted into the O-ring in the first short tube is also located in the through hole. Therefore, the junction between the first short pipe and the second short pipe is not flattened without receiving earth pressure. In addition, when two or more O-rings are used, the connection angle between the second short pipe and the first short pipe does not change, but even if the connection angle changes somewhat due to ground changes, etc. Since the ring is on the inner side of the pillow, the change in angle is smaller than that on the outer side of the pillow and is less susceptible to that effect. Therefore, a rubber ring having a large volume and a high compression rate is not required.
[0018]
Furthermore, since the volume of the O-ring is small, the gap between the first short pipe and the second short pipe is narrow, and the connection angle between the first short pipe and the second short pipe does not change, and earth and sand etc. from this gap Hard to enter. Even if earth and sand enters, the O-ring is inside the pillow and the distance from the end of the first short pipe on the outside of the pillow is long, so it is difficult for the earth and sand to reach the O-ring. Sediment does not enter between the ring and the first and second short tubes to prevent adhesion.
[0019]
【The invention's effect】
According to this invention, since the skirt is made of the first resin that can be bonded to the manhole wall, the skirt, that is, the manhole joint can be directly bonded to the manhole wall, and the manhole wall and the skirt can be in close contact with each other. None and excellent workability.
[0020]
Since the water tightness is secured between the first short pipe and the second short pipe by an O-ring, the water tightness can be maintained even if the second short pipe is displaced, and the second short pipe is connected to the manhole joint. Can expand and contract. As a result, since it is possible to communicate with the sewer pipe, not only water tightness can be secured, but also workability is good.
[0021]
If the position of the O-ring is within the thickness of the manhole wall, there is no flattening due to earth pressure, etc., so the compression rate of the O-ring can be kept small, and watertightness is maintained without being deformed by the creep phenomenon. it can.
[0022]
The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.
[0023]
【Example】
A manhole joint 10 according to an embodiment of the present invention shown in FIG. The pillow 12 is made of, for example, a first resin of polyvinyl chloride that can be bonded to a concrete manhole wall with an epoxy adhesive or the like. As shown in FIG. 2, the inner wall 14a of the plate 14 is along the outer surface 18a of the side wall of the manhole wall 18, and the tube 16 is inside the plate 14 (see FIG. 1). It is located on the right side) and is inserted into the through hole 20 (FIG. 2) of the manhole wall 18. This pillow 12 can be made by secondary processing of a flat plate. For example, the first resin plate is softened by heating and bent into an arc of a predetermined arc, then a small hole is made in the center of the plate, and a cylinder is pushed into the hole from the outside of the plate toward the center of the arc. Form the tube. However, such an arcuate deformation and a tube portion may be formed simultaneously.
[0024]
Then, the first short tube 22 is inserted into the above-described tube portion 16 of the pillow 12. The first short pipe 22 is a straight pipe formed of the same first resin (vinyl chloride) as the pillow 12. The first short tube 22 is longer than the tube portion 16 of the pillow 12 and one end thereof is inserted into the tube portion 16 of the pillow 12 and joined to the tube portion 16 by an adhesive or fusion. The other end protrudes outward (left side in FIG. 1) from the plate portion 14 of the crown 12. On the inner surface of the first short tube 22 inserted into the tube portion 16 of the cylinder 12, there are at least one (in this embodiment, two, but one or three or more) annular O-ring receiving grooves 24. Is formed in the circumferential direction by cutting or the like, and an O-ring 26 is accommodated in the O-ring accommodating groove 24. The thickness of the O-ring 26 is larger than the depth of the O-ring receiving groove 24, and the inner diameter is smaller than the diameter of the second short tube 28 described later.
[0025]
The second short pipe 28 is a straight pipe made of the same material as the second resin, for example, the sewer pipe, and an annular flange 30 is formed at one end of the second short pipe 28. The second short tube 28 is inserted into the first short tube 22 and is sealed and fixed by an O-ring 26 attached to the inner surface of the first short tube 22. The collar portion 30 engages with the end portion of the first short tube 22 on the tube portion 16 side of the pillow 12. The end face 30 a on the inner side of the flange portion 30 is flush with the inner surface 18 b of the manhole wall 18 or falls within the thickness of the manhole wall 18. The second short pipe 28 is longer than the first short pipe 22, and the length of the portion protruding from the first short pipe 22 to the outer surface side of the club 12 is at least the length of the joining margin of the EF joint 32 (FIG. 3). is there.
[0026]
In addition, the sanding process 34 is given to the outer surface of the outer surface of the pipe part 16 of the skirt 12 and the outer surface of the part protruding from the inner end of the pipe part 16 of the first short pipe 22. The sanding process 34 is a process of attaching gravel or resin particles to the surface of a pipe or the like by an adhesive or fusion.
[0027]
When the sewer pipe is connected to the manhole 18 using the manhole joint 10 of this embodiment, an epoxy-based adhesive 36 is first applied to the inner surface 14a of the plate portion 14 of the pillow 12 as shown in FIG. Then, the tube portion 16, the first short tube 22, and the second short tube 28 of the skirt 12 are made into the through holes 20 of the manhole wall 18 so that the inner surface 14 a of the plate portion 14 of the skirt 12 extends along the outer surface 18 a of the manhole wall 18. Fit. Immediately thereafter, a wire (not shown) is wound around the plate portion 14 and the manhole wall 18 of the slipper 12 so that the plate portion 14 of the slipper 12 is in close contact with the side wall of the manhole wall 18, thereby connecting the manhole joint 10 to the manhole wall 18. Secure to. Finally, a filler 38 such as mortar is embedded between the inner peripheral surface of the through-hole 20 and the outer surface of the pipe portion 16 and the first short tube 22 of the pillow 12. In this way, the manhole joint 10 is fixed to the manhole wall 18 as shown in FIG.
[0028]
Thereafter, as shown in FIG. 3, the sewage pipe 40 is connected to the second short pipe 28 using an EF joint 32 at a portion of the second short pipe 28 that protrudes from the first short pipe 22 to the outer surface side of the pillow 12.
[0029]
In this way, since the glue 12, that is, the manhole joint 10, can be directly bonded to the manhole wall 18, a filling material such as mortar or a temporary material to be held until it hardens is unnecessary, and the temporary material is installed or removed. This eliminates the hassle, and does not require time until the filler is solidified, resulting in excellent workability.
[0030]
Since the O-ring 26 ensures the watertightness between the first short pipe 22 and the second short pipe 28, even if the ground fluctuation occurs and the second short pipe 28 is displaced with respect to the manhole joint 10, The ring 26 can follow the displacement and maintain water tightness.
[0031]
Since the mounting position of the O-ring 26 is in the through hole 20 of the manhole wall 18, the joint between the first short tube 22 and the second short tube 28 is not subjected to earth pressure and is not deformed. Further, the second short tube 28 is held by the length of the first short tube 22, and the gap between the second short tube 28 and the first short tube 22 is wide enough for the O-ring 26 to closely contact the second short tube 28. The connection angle of the two short pipes 28 to the first short pipe 22 does not change greatly. Even if the connection angle changes by the amount of the gap, the position of the O-ring 26 is located on the inner side of the pillow 12, so that the displacement is smaller than the outer side and does not affect the adhesion of the O-ring 26. For this reason, the volume and compression rate of the O-ring 26 can be kept small, the deformation of the creep phenomenon of the second short tube 28 due to the tightening of the O-ring 26 can be prevented, and the adhesion force of the O-ring 26 to the second short tube 28 can be prevented. The water tightness can be maintained without lowering.
[0032]
In this embodiment, since the number of O-rings 26 for fixing the second short tube 28 is two, the second short tube 28 is fixed in three dimensions. If the number of O-rings 26 is one, the second short tube 28 is fixed in two dimensions, and the second short tube 28 rotates about the distance between the first short tube 22 and the second short tube 28 as a fulcrum. Then, since the movement is hindered, the compression rate required for one O-ring 26 can be suppressed, and water tightness can be maintained.
[0033]
Since the second short pipe 28 is inserted into the first short pipe 22 in advance and the flange 30 of the second short pipe 28 is engaged with the end of the first short pipe 22, even if there is a ground change or the like, It is possible to prevent the two short pipes 28 from falling out of the manhole joint 10.
[0034]
Further, the baffle 42 can be easily attached to the manhole 18 by utilizing the fact that the flange portion 30 is engaged with the end portion 22 a of the first short tube 22. That is, as shown in FIG. 3, a fastener 44 for fixing the baffle 42 is attached between the flange portion 30 of the second short tube 28 and the end portion 22 a of the first short tube 22. The main body 46 of the fastener 44 shown in FIGS. 3 and 4 is an annular flat plate having a hole 48 in the center, a step 50 is provided on the outer side of the main body 46, and a fixing portion 52 is further provided. The outer diameter of the main body 46 of the fastener 44 is the same as the outer diameter of the first short tube 22, and the step 50 is the difference between the inner end 22 a of the first short tube 22 and the inner surface 18 b of the manhole wall 18. The fixed portion 52 is a rectangular flat plate, and is provided along the inner surface 18 b of the manhole wall 18. A bolt 54 is provided on the inner surface of the fixed portion 52 so as to protrude toward the inner side of the manhole 18. The baffle 42 has a shape in which a groove portion 56 is provided by bending or the like in the center portion of the flat plate, and a hole 60 for passing the bolt 54 of the fastener 44 is provided in the end portion 58. When the baffle 42 is attached to the manhole joint 10, the main body 46 of the fastener 44 is sandwiched between the outer end surface 30 b of the flange portion 30 of the second short tube 28 and the inner end surface 22 a of the first short tube 22, and is fastened in advance. The tool 44 is attached to the manhole joint 10. Then, the bolt 54 of the fastener 44 is inserted into the hole 60 of the baffle 42 and fixed with the nut 62. Therefore, since the fastener 44 is attached to the manhole joint 10 in advance, the baffle 42 can be easily attached to the manhole joint 10 and the manhole wall 18 later.
[0035]
In addition, the shape of the collar part 30 of the 2nd short tube 28 does not need to be cyclic | annular, and the collar part 30 itself does not need to be provided.
[0036]
Further, if the length of the portion of the second short pipe 28 protruding from the first short pipe 22 is set to the length of the joining allowance of the EF joint 32, ground fluctuation or the like occurs and the second short pipe 28 enters the manhole wall 18. Even if it tries to move, since the EF joint 32 is engaged with the first short pipe 22, further inward movement is prevented.
[0037]
In addition, although the pillow 12 and the 1st short tube 22 were created separately and these were joined by the adhesive agent, the melt | fusion, etc., as shown in FIG. 5, you may integrally mold these. The short tube 66 of the integrally molded product 64 serves as the first short tube 22 of the previous embodiment shown in FIG. 1 and the tube portion 16 of the pillow 12, and the short tube 66 is connected to the plate portion 68 of the pillow 12. The
[0038]
Although the length of the protruding portion of the second short pipe 28 is the length of the joining margin of the EF joint 32, this length may be made longer. In particular, when the length of the EF joint 32 is longer than that of the EF joint 32, when the sewage pipe 40 is inserted into the EF joint 32, the EF joint 32 is once fed onto the second short pipe 28 and the sewage pipe 40 is butted against the second short pipe 28. The EF joint 32 may be moved to a predetermined position between the second short pipe 28 and the sewage pipe 40. For this reason, the exchange at the time of joining becomes easy. In addition, even when the second short pipe 28 moves to the manhole 18 side when the ground changes or the like occurs, the length of the protruding portion of the second short pipe 28 becomes a push-in allowance, so the second short pipe 28 Therefore, water tightness can be secured.
[0039]
A manhole joint 10 which is another embodiment of the present invention shown in FIG. 6 is substantially the same as the manhole joint 10 shown in FIG. 1 is located inside the plate portion 14 and is inserted into the through hole 20 of the manhole wall 18, the tube portion 50 of the embodiment 48 in this embodiment is composed of the plate portion 74 and the manhole. It is located outside the through hole 20 (not shown) of the wall 18. Therefore, the sanding process 34 is performed only on the outer surface of the first short tube 22 located on the inner side of the plate portion 74 of the pillow 48. The other parts are the same as the manhole joint 10 shown in the embodiment of FIG.
[0040]
In any of the above-described embodiments, the manhole joint 10 may be circulated in a state where the EF joint 32 is fused to the second short pipe 28. In this case, there is an advantage that the selection of the EF joint is not mistaken at the construction site. Moreover, although the EF joint 32 is attached to the portion of the second short tube 28 that protrudes outward from the first short tube 22, an EF piece support may be provided instead. The EF piece receptacle is an enlarged diameter receptacle, and is an EF joint in which a heating element such as a heating wire is previously incorporated in the receptacle. When this EF piece holder is attached to the second short tube 28, the second short tube 28 is first inserted into the first short tube 22, and the EF piece holder is butt-welded to the outer end of the second short tube 28. And connect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a manhole joint according to an embodiment of the present invention.
2 is a cross-sectional view showing a state where the manhole joint of FIG. 1 embodiment is bonded to a manhole wall. FIG.
3 is a cross-sectional view showing a state in which a sewer pipe is connected to a manhole using the manhole joint of FIG. 1 embodiment. FIG.
FIG. 4 is a perspective view showing a baffle and a fastener.
FIG. 5 is a sectional view showing a manhole joint according to another embodiment of the present invention.
FIG. 6 is a sectional view showing a manhole joint according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Manhole joint 12 ... Kura 18 ... Manhole wall 22 ... 1st short pipe 24 ... O-ring accommodation groove 26 ... O-ring 28 ... 2nd short pipe 32 ... EF joint

Claims (4)

The first resin that can be adhered to the manhole wall and having an inner surface along the outer surface of the manhole wall,
A first short pipe made of the first resin and penetrating the skirt,
At least one O-ring receiving groove formed on the inner surface of the first short pipe;
A manhole joint comprising: an O-ring housed in the O-ring housing groove; and a second short pipe made of a second resin that is longer than the first short pipe and is inserted into the first short pipe. The manhole joint according to claim 1, wherein the length of the second short pipe protruding from the first short pipe toward the outer surface side is a length corresponding to at least a joining allowance by an EF joint. The manhole joint according to claim 1, wherein the O-ring housing groove is provided within a thickness of the manhole wall. The second short pipe includes a collar formed at an end thereof, and a fastener for fixing a baffle to the manhole wall is sandwiched between the collar and the end of the first short pipe. The manhole joint according to any one of claims 1 to 3.

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