JP3902482B2 - Connection structure between manhole and piping - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure between a manhole embedded in the ground and a pipe, and more specifically, the pipe can be easily connected from the inside of the manhole, and the manhole and the pipe can be connected to each other so that the manhole and the pipe can be expanded and contracted. Concerning connection structure.
[0002]
[Prior art]
In general, when connecting a protection pipe for inserting a water and sewage pipe or a communication cable to a concrete manhole, insert one end of the pipe into a through-hole drilled in the side wall of the manhole, and A gap between the surface and the inner peripheral surface of the through-hole is filled with mortar or the like and connected. However, when manholes and pipes are rigidly connected using this mortar, the displacement of the two is not absorbed in the event of an earthquake or ground subsidence, so the pipes may break or the connection with the manholes will be damaged. was there.
[0003]
[Problems to be solved by the invention]
In order to solve this problem, a structure for connecting a manhole and a pipe through a rubber joint called a seismic joint has been proposed in recent years. In either case, the pipe is connected from the outside of the manhole. . For this reason, in the connection work, it is necessary to dig up the outside of the manhole to create a work space, which not only makes the construction large, but also has a problem of greatly affecting nearby traffic. In particular, when an existing joint in which manholes and pipes are rigidly connected with mortar or the like is changed to an earthquake-resistant connection structure, there is a problem that it takes time for construction work.
[0004]
The present invention solves such a problem, and provides a connection structure between a manhole and a pipe that can easily connect the pipe from the inside of the manhole and can connect the manhole and the pipe so that the pipe can be expanded and contracted. .
[0005]
[Means for Solving the Problems]
The present invention is a connection structure between a manhole and a pipe in which one end of a pipe is inserted into a through hole provided in a side wall of a manhole, and the through hole and one end of the pipe are connected via a joint. A flange that expands in the form of a flange is provided at one end of a short pipe inserted between the inner peripheral surface of the hole and the outer peripheral surface of the pipe, and the flange is fixed to the inner wall of the manhole with an anchor bolt. A ring-shaped pressing plate is connected to a flange provided at the other end of the pipe portion via a screw member, and an elastic seal material interposed between the flange and the pressing plate is tightened with the screw member to the inner periphery side and outer periphery. It is expanded to the side, and is crimped to the outer peripheral surface of the pipe and the inner peripheral surface of the through hole.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a connection structure between a manhole and a pipe according to an embodiment of the present invention. FIG. 2 shows a through-hole formed in a side wall of an existing manhole in which the manhole and the pipe are rigidly joined by mortar or the like. It is sectional drawing which shows a process, Comprising: This invention inserts the one end part of the piping 2 in the through-hole 11 provided in the side wall of the manhole 1, and connects the said through-hole 11 and the one end of the piping 2 via the coupling 3. It is a thing.
[0007]
The joint 3 used in the present invention is made of a corrosion-resistant metal member such as stainless steel or a plastic such as vinyl chloride resin, and the inner peripheral surface of the through hole 11 provided in the side wall of the manhole 1 and the outer peripheral surface of the pipe 2. A collar portion 32 is provided at one end of the short tube portion 31 inserted between the two. The flange 32 is formed in a curved surface that expands into a flange shape and abuts against the inner wall of the manhole 1, and a plurality of through holes 321 through which the anchor bolts 4 are inserted are provided on the outer peripheral edge thereof.
[0008]
An anchor nut 41 is embedded at a suitable place on the inner wall of the manhole 1 to which the joint 3 is fixed, and the joint 3 is fixed to the inner wall of the manhole 1 by an anchor bolt 4 screwed with the anchor nut 41. A cushioning material such as polyurethane, an epoxy-based putty 7 or the like can be appropriately interposed between the flange portion 32 of the joint 3 and the inner wall of the manhole 1 as necessary.
[0009]
On the other hand, a flange 33 projecting toward the inner peripheral side is provided at the other end of the short pipe portion 31 constituting the joint 3, and the flange 33 and a ring-shaped pressing plate 34 arranged to face the outside are screwed together. The elastic sealing material 6 is clamped between the members 5 connected to each other. The sealing material 6 is made of an elastic member such as rubber. When the distance between the flange 33 and the pressing plate 34 is reduced by the tightening action of the screw member 5, the sealing material 6 expands to the inner peripheral side and the outer peripheral side, and the outer peripheral surface of the pipe 2. Water tightness is ensured by pressure bonding to the inner peripheral surface of the through hole 11.
[0010]
The outside of the connecting portion between the manhole 1 and the pipe 2 by the elastic sealing material 6, that is, the outside of the through hole 11 is covered with a net 8 having corrosion resistance such as stainless steel or plastic so that earth and sand do not enter the connecting portion. Is formed. Further, a ring-shaped elastic member 9 made of synthetic rubber or the like for covering the screw member 5 and holding the pipe 2 at the center position is mounted inside the through hole 11. 9 may be provided as necessary.
[0011]
The connection structure using the joint 3 can be suitably used when connecting a pipe to a new manhole. However, as shown in FIG. 2, the connection structure is applied to an existing manhole in which the manhole and the pipe are rigidly connected by a mortar or the like. You can also. In the case of this construction example, a through hole is first drilled from the inside of the manhole 1 with a hole saw on the side wall as shown by a two-dot chain line in the figure.
[0012]
Next, the mortar etc. adhering to the outer peripheral surface of the pipe 3 is removed and cleaned cleanly. Therefore, as shown in FIG. 1, the net 8 formed in a ring shape through the through-hole 11 is moved to the outer wall side of the manhole 1 while being extrapolated to the pipe 2, and the net 8 is spread to make its peripheral part the outer wall of the manhole 1. set. In this way, the outside of the through-hole 11 is covered with the net 8 to prevent earth and sand from entering the manhole 1.
[0013]
Therefore, an anchor nut 41 is embedded at a suitable position on the inner wall of the manhole 1, and the distal end portion of the joint 3, that is, the short pipe portion 31 having the elastic sealing material 6 interposed between the flange 33 and the pressing plate 34 is extrapolated to the pipe 2. After that, the anchor bolt 4 is inserted into the through hole 321 provided in the flange portion 32 and screwed into the anchor nut 41. At this time, a cushioning material such as polyurethane, an epoxy-based putty 7 or the like can be appropriately interposed between the flange portion 32 of the joint 3 and the inner wall of the manhole 1 as necessary.
[0014]
Finally, the screw member 5 is tightened, and the elastic sealing material 6 compressed between the flange 33 and the pressing plate 34 and expanded on the inner peripheral side and the outer peripheral side is applied to the outer peripheral surface of the pipe 2 and the inner peripheral surface of the through hole 11. Crimp. Therefore, a ring-shaped elastic member 9 made of synthetic rubber or the like is attached inside the through hole 11 as necessary.
[0015]
Thus, the connection state shown in FIG. 1 is established, and the through hole 11 of the manhole 1 and the pipe 2 are connected to each other via the elastic sealing material 6 so that they can be expanded and contracted, so that the pipe 2 can be connected even if an earthquake or ground subsidence occurs. There is no breakage or damage to the joint with the manhole 1.
[0016]
【The invention's effect】
As described above in detail, according to the connection structure of the present invention, since piping can be connected only from the inside of the manhole, construction time at the site can be greatly shortened, and connection with excellent earthquake resistance can be achieved. can get. In particular, an existing manhole in which manholes and pipes are rigidly connected by mortar or the like can be changed to a connection structure having excellent earthquake resistance by connecting work from the inside of the manhole.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a connection structure between a manhole and piping according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a step of forming a through hole in a side wall of an existing manhole rigidly connected by mortar or the like.
[Explanation of symbols]
1 Manhole 2 Piping 3 Joint 4 Anchor Bolt 5 Screw Member 6 Elastic Seal Material

Claims (1)

One end portion of a pipe is inserted into a through hole provided in a side wall of a manhole, and the manhole and the pipe are connected to each other through a joint, and the inner periphery of the through hole A flange portion that is widened in a flange shape is provided at one end of the short pipe portion inserted between the surface and the outer peripheral surface of the pipe, and the flange portion is fixed to the inner wall of the manhole with an anchor bolt. A ring-shaped pressing plate is connected to a flange provided at the other end via a screw member, and an elastic sealing material interposed between the flange and the pressing plate is expanded to the inner peripheral side and the outer peripheral side by tightening the screw member. A manhole-pipe connection structure characterized in that it is crimped to the outer peripheral surface of the pipe and the inner peripheral surface of the through hole.

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