JP3706434B2 - Manhole joint structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a manhole joint structure, and more particularly to a manhole joint structure that is used for joining a manhole and a connecting pipe, for example, in a sewer pipe, and is particularly excellent in workability and water stoppage.
[0002]
[Prior art]
A conventional manhole joint structure of this type is shown in FIGS.
In the prior art shown in FIG. 7, the short tube 3 is inserted into the hole 2 drilled in the side wall of the manhole 1, and the mortar 4 is filled and joined between the manhole 1 and the short tube 3. And the connecting pipe 5 which should be joined from the front-end | tip of the short pipe 3 is inserted.
[0003]
On the other hand, in the prior art shown in FIG. 8, instead of the mortar 4, a special ring 7 is used for joining the manhole joint. That is, the large diameter portion 6a of the rubber joint 6 is fitted into the hole 2 of the manhole 1, and the band 7 is attached to the inner surface of the large diameter portion 6a. Then, using a special jig, the band 7 is deformed in the diameter increasing direction, and the rubber joint 6 is fixed to the hole 2. Further, an O-ring 8 is disposed between the large diameter portion 6 a of the rubber joint 6 and the connecting pipe 5 in order to ensure flexibility after construction.
[0004]
[Problems to be solved by the invention]
However, when the manhole 1 and the short pipe 3 as a manhole joint are joined by the mortar 4 as in the prior art shown in FIG. 7, there is a possibility that the filling of the mortar 4 may vary in an actual construction site. In addition, when the mortar 4 is not sufficiently filled, there is a problem that the expected water stoppage cannot be secured. In addition, when an external force in the direction of bending the pipe is applied to the connecting pipe 5 due to an earthquake or the like, a bending stress acts on the mortar 4 to deform or break the mortar 4, resulting in loss of water stoppage. It was.
[0005]
On the other hand, in the prior art shown in FIG. 8, the above-mentioned problems can be solved by joining without using mortar. However, since the rigidity of the rubber joint 6 is insufficient, for example, in the case of backfilling The rubber joint 6 may be elastically deformed by earth pressure, and the connecting pipe may be sunk. Accordingly, the required gradient cannot be ensured in the pipeline, and the water flow may be deteriorated. Furthermore, when attaching to the rubber joint 6 using the ring 7, a special jig is required, and the attachment is troublesome.
[0006]
Therefore, a main object of the present invention is to provide a manhole joint structure which is excellent in workability, water-stopping property and settlement resistance.
[0007]
[Means for Solving the Problems]
The present invention relates to a rubber ring provided in a hole in a manhole wall, a sheath having an outer surface pressed against the inner surface of the rubber ring and having a predetermined pipe length, a rubber joint to be attached to the tip of the sheath, and from the tip of the rubber joint to the sheath A connecting pipe that is inserted and the end of the pipe faces the hole, a tightening member that tightens the tip of the rubber joint to the connecting pipe, and a water stop material formed between the sheath pipe and the connecting pipe at least in the position of the hole. Manhole joint structure.
[0008]
[Action]
The rubber ring provided in the hole in the manhole wall allows the sheath tube to be joined without effort to the manhole. Further, the sheath pipe and the connecting pipe are joined by a rubber joint. Therefore, even if an external force in the direction of bending the pipe acts on the pipe, the rubber ring and the rubber joint are elastically deformed according to the bending of the pipe, so that the water stop is maintained and the connecting pipe is damaged. There is nothing to reach. On the other hand, when an external force in the direction of the pipe axis is applied to the pipe, the connecting pipe slides in the direction in which the external force acts at the position of the fastening member, and the pipe is allowed to expand and contract. At this time, even if the connecting pipe is detached from the hole, the pipe line function is maintained by the sheath pipe.
[0009]
In addition, the sheath tube receives the overload at the time of backfilling and does not act on the connecting tube. Accordingly, the problem that the connecting pipe sinks due to backfilling and the required gradient cannot be obtained is solved.
[0010]
【The invention's effect】
According to the present invention, the sheath tube can be connected to the manhole wall without using a joining material such as mortar, a special part, or a jig, and the workability is remarkably excellent. In addition, since all the joints are made of elastic members (rubber rings and rubber joints), it is possible to follow any external force acting on the connecting pipe and to ensure water-stopping.
[0011]
In addition, since the earth pressure at the time of backfilling is received by the sheath pipe, the direct loading on the connecting pipe can be eased, and therefore the change in the gradient of the connecting pipe can be prevented.
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.
[0012]
【Example】
Referring to FIG. 1, a manhole joint structure 10 of this embodiment joins a PVC pipe 16 as a connecting pipe to a connecting hole 14 formed by drilling a manhole wall 12. In this embodiment, a PVC pipe 16 having a circular cross section is joined to the manhole wall 12. Further, a rubber ring 18 having an inner diameter larger than the outer diameter of the PVC pipe 16 is included, and the rubber ring 18 is disposed in the connection hole 14.
[0013]
In this embodiment, a nipple RM ring (trade name) manufactured by Nippon Plastic Industry Co., Ltd., in which SBR (Styrene Butadiene Rubber) is molded into a substantially annular shape, is applied to the rubber ring 18. As shown in FIG. 2, the rubber ring 18 has a rib structure in which a plurality of ribs 20 are formed in the circumferential direction on the inner and outer peripheral surfaces, and the ribs 20 ensure water blocking. Further, a water-expandable rubber 22 is disposed in the circumferential direction in the approximate center of the width (axial center) of the rubber ring 18. The water-swellable rubber 22 expands in response to an aqueous solution. For example, the water-swellable rubber 22 expands 260% (volume%) with tap water, 230% with cement supernatant, and 190% with 3% salt water. Therefore, the combination of the water-expandable rubber 22 and the rib 20 makes it possible to easily attach the rubber ring 18 to the connection hole 14 without using a bonding agent or mortar, and between the connection hole 14 and the rubber ring 18. The sealability of is guaranteed. Further, a lip 24 is provided in the circumferential direction at the peripheral end of the water-expandable rubber 22.
[0014]
A sleeve (sheath tube) 28 is inserted into the hole 26 of the rubber ring 18 so that one end surface thereof coincides with the inner surface of the manhole wall 12. The sleeve 28 has an outer diameter slightly larger than the inner diameter of the rubber ring 18, an inner diameter larger than the outer diameter of the PVC pipe 16, and a pipe length longer than the thickness of the manhole wall 12. In this embodiment, the sleeve 28 is formed of a vinyl chloride resin so as to have a substantially circular cross section in the same shape as the hole 26 of the rubber ring 18. Therefore, the sleeve 28 is retained and secured by the rib 20 and the water-expandable rubber 22 formed on the inner peripheral surface of the rubber ring 18.
[0015]
From the distal end side of the sleeve 28 (left side in FIG. 1), the PVC pipe 16 is inserted into the sleeve 28. That is, as described above, the PVC pipe 16 has an outer diameter smaller than the inner diameter of the sleeve 28 and is inserted into the sleeve 28 until the pipe end coincides with the inner surface of the manhole wall 12. Then, a rubber joint 30 as shown in FIG. 3 is arranged on the outer peripheral surface on the distal end side of the sleeve 28 and the outer peripheral surface of the connection pipe 16, and both are joined with flexibility.
[0016]
The rubber joint 30 has a large-diameter portion 32 a having an inner diameter substantially equal to the outer diameter of the sleeve 28, and a small-diameter portion 32 b having an inner diameter substantially equal to the outer diameter of the connection pipe 16. Plural ridges 34a and 34b that are continuous in the circumferential direction are formed on the inner peripheral surfaces of the large-diameter portion 32a and the small-diameter portion 32b. On the other hand, grooves 36a and 36b continuous in the circumferential direction are formed on the outer peripheral surfaces of the large diameter portion 32a and the small diameter portion 32b. As shown in FIG. 1, in a state where the rubber joint 30 is disposed in relation to the connection pipe 16 and the sleeve 28, a band 38 is attached to the grooves 36 a and 36 b, and the rubber joint 30 is connected to the connection pipe 16 and the sleeve 28. It is fixed to the outer peripheral surface.
[0017]
The band 38 is formed of stainless steel or the like, for example, by rotating a threaded pin (not shown) arranged in a tangential direction thereof and tightening the connecting pipe 16 and the sleeve 28 in the reduced diameter direction. . Therefore, the rubber joint 30 is attached to the connecting pipe 16 and the sleeve 28 in a state where the protrusions 34 a and 34 b formed on the inner peripheral face of the rubber joint 30 are pressed against the outer peripheral faces of the connecting pipe 16 and the sleeve 28.
[0018]
As shown in FIG. 1, a positioning member 40 is disposed at a predetermined position in a gap portion sandwiched between the PVC pipe 16 and the sleeve 28. In this embodiment, the positioning member 40 is formed by forming a foamed polyethylene resin having a hollow cross-sectional shape in an annular shape, and is configured to be easily elastically deformed. Thus, the PVC pipe 16 can be easily centered by arranging the positioning member 40 in relation to the PVC pipe 16 inserted to a predetermined position of the connection hole 14 of the manhole wall 12. At least at the position of the connection hole 14 of the manhole wall 12, a water blocking material 42 such as mortar or a bonding agent is filled between the PVC pipe 16 and the sleeve 28 to the inner surface of the manhole wall 12. That is, the PVC pipe 16 is firmly connected to the manhole wall 12 by the water stop material 42 while maintaining a predetermined gradient. Since the PVC pipe 16 and the sleeve 28 are made of the same material, they can be joined relatively easily and sufficient water-stopping is ensured.
[0019]
A construction example of the manhole joint structure 10 configured as described above will be described in detail below. First, the connection hole 14 corresponding to the cross-sectional shape and the pipe diameter of the PVC pipe 16 (rubber ring 18) to be connected is formed at a predetermined position on the manhole wall 12. Then, the inner wall of the connection hole 14 is smoothed as necessary, and the rubber ring 18 is disposed in the connection hole 14 so that the lip 24 of the rubber ring 18 is brought into contact with the outer peripheral surface of the manhole wall 12. Subsequently, the sleeve 28 is inserted into the hole 26 of the rubber ring 18 to a predetermined position. At this time, if the tube end portion of the sleeve 28 is chamfered and a lubricant is applied to the sliding surface between the rubber ring 18 and the sleeve 28, the insertion resistance can be reduced and insertion can be easily performed.
[0020]
Next, the PVC pipe 16 is inserted into the rubber joint 30 from the small diameter portion 32 b side of the rubber joint 30, and the rubber pipe 30 is attached to the outer periphery of the PVC pipe 16. 28 is inserted. When the PVC pipe 16 is inserted to a predetermined position, the rubber joint 30 is moved on the outer periphery of the PVC pipe 16 and the pipe end of the sleeve 28 is inserted into the large diameter portion 32 a of the rubber joint 30. Then, the ring 38 is attached to the grooves 36 a and 36 b of the rubber joint 30, and the rubber joint 30 is firmly attached to the PVC pipe 16 and the sleeve 28. Subsequently, from the inside of the manhole wall 12, a positioning member 40 is inserted between the PVC pipe 16 and the sleeve 28, and positioning (centering) is performed based on a gradient corresponding to the sewage flow. After the positioning, at least the position of the connection hole 14 is filled with the water blocking material 42 between the PVC pipe 16 and the sleeve 28, and the PVC pipe 16 is firmly attached to the manhole.
[0021]
According to this embodiment, since the manhole wall 12 and the sleeve 28 can be easily joined by the rubber ring 18, it is possible to wait for the joining material such as mortar to harden as in the prior art (conventional example in FIG. 7). There is no need to use a special jig (conventional example in FIG. 8). In addition, by arranging the sleeve 28 outside the PVC pipe 16, it is possible to prevent the upper load from being applied directly to the PVC pipe 16 during backfilling. Therefore, the required pipeline gradient is not upset by backfilling.
[0022]
Further, since the joint portion (rubber ring 18 and rubber joint 30) is made of an elastic synthetic resin, the PVC pipe 16 and the sleeve 28 are bent when an external force in the direction of bending the pipe is applied due to an earthquake or the like. At the same time, the water blocking material 42 provided between the PVC pipe 16 and the sleeve 28 is deformed or broken, and damage to the manhole, the PVC pipe 16 and the sleeve 28 is suppressed to a minimum. On the other hand, when an external force in the pipe axis direction is applied to the pipe, the PVC pipe 16 slides at the position of the band 38, and the distortion of the pipe is absorbed. At this time, even if the PVC pipe 16 is detached from the connection hole 14, the pipe line function is maintained as long as the pipe end of the PVC pipe 16 exists in the sleeve 28. Further, whether the PVC pipe 16 has detached from the connection hole 14 can be easily confirmed visually from the inside of the manhole.
[0023]
Next, FIG. 4 shows a manhole joint structure 10 which is another embodiment of the present invention. This embodiment differs from the embodiment of FIG. 1 in the following points. That is, in the embodiment of FIG. 4, the sleeve 28 having the flange portion 44 extending in the direction perpendicular to the axis is used, and when joining, the sleeve 28 is inserted from the inside of the manhole. Specifically, first, after the connection hole 14 is formed in the manhole wall 12 in relation to the shape of the sleeve 28, the connection hole is formed so that the lip 24 of the rubber ring 18 contacts the inner surface of the manhole wall 12. The rubber ring 18 is arranged in the connection hole 14 from the inside of the 14. Then, the sleeve 28 is inserted into the connection hole 14 from the inside of the manhole, and the PVC pipe 16 is attached to the manhole in the same procedure as in the embodiment of FIG.
[0024]
As the band 38 for fixing the rubber joint 30, for example, a rubber ring formed of a synthetic rubber in an annular shape is used, and the band 38 is elastically deformed in the diameter increasing direction, and around the rubber joint 30. The rubber joint 30 may be securely attached to the PVC pipe 16 and the sleeve 28 by arranging and urging the rubber. Further, the positioning member 40 for centering the PVC pipe 16 is not limited to the embodiment shown in FIG. 1. For example, a member (not shown) formed in a wedge shape having a different size is used as the PVC pipe 16 and the sleeve 28. If it is arranged intermittently between the two, the centering work can be easily performed at the construction site, which is convenient.
[0025]
Furthermore, as shown in FIG. 5, if the ribs 46 are provided on the outer peripheral surface of the sleeve 28 so that the sleeve 28 has rigidity, the earth pressure at the time of backfilling can be sufficiently coped with. In addition, in FIG. 1 embodiment, the diameter between the large diameter portion 32a and the small diameter portion 32b of the rubber joint 30 is formed in a tapered shape. Instead, for example, as shown in FIG. Of course, the portion 32a and the small-diameter portion 32b may be connected by a bent portion 48, and the rubber joint 30 may be formed in a bellows shape (not shown) to give rigidity. .
[0026]
Further, it goes without saying that this manhole joint structure can also be applied to the case where the PVC pipe 16 is, for example, an egg-shaped egg-shaped pipe when viewed from the axial direction. The sleeve 28 and the rubber ring 18 are also of a shape corresponding to the PVC pipe 16.
[Brief description of the drawings]
FIG. 1 is an illustrative view showing one embodiment of the present invention;
FIG. 2 is an illustrative view showing a rubber ring of the embodiment in FIG. 1;
FIG. 3 is an illustrative view showing a rubber joint of FIG. 1 embodiment;
FIG. 4 is an illustrative view showing another embodiment.
FIG. 5 is an illustrative view showing a modified example of a sleeve.
FIG. 6 is an illustrative view showing a modified example of the rubber joint.
FIG. 7 is an illustrative view showing a conventional technique.
FIG. 8 is an illustrative view showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Manhole joint structure 12 ... Manhole wall 14 ... Connection hole 16 ... PVC pipe 18 ... Rubber ring 28 ... Sleeve 30 ... Rubber joint 38 ... Band 40 ... Positioning member 42 ... Water stop material

Claims (1)

Rubber ring in the hole of the manhole wall,
A sheath tube having an outer surface pressed against the inner surface of the rubber ring and having a predetermined tube length;
A rubber joint attached to the tip of the sheath tube;
A connecting pipe that is inserted into the sheath pipe from the tip of the rubber joint so that the pipe end faces the hole;
A manhole joint structure comprising: a fastening member for fastening a tip of the rubber joint to the connection pipe; and a water stop material formed between the sheath pipe and the connection pipe at least at the position of the hole.

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