JPH0555757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection structure for a pair of concrete pipe bodies.

[Prior Art] Concrete pipes having a corrosion-resistant layer made of a plastic lining plate or the like formed on the inner circumferential surface are widely used as pipes for wastewater treatment and the like. In order to form a conduit by sequentially connecting such pipe bodies, a socket with a reduced outer diameter and a socket with an enlarged inner diameter are formed at each end of the pipe. , the sockets of one of the adjacent tube bodies are fitted into the sockets of the other and fixed. In order to prevent the liquid or gas flowing inside the pipe from leaking out from the connection part, conventionally, an elastic member such as rubber is formed in an annular shape between the outer periphery of the insertion port and the inner periphery of the socket. He was wearing a ring-shaped joint.

[Problems to be Solved by the Invention] According to the concrete pipe connection structure configured as described above, the outflow of liquid, gas, etc. passing through the pipe to the outside can be prevented by the ring-shaped joint. The liquid, gas, etc. enter between the end surfaces of adjacent tube bodies. Therefore, there was a problem that that part may have been corroded.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to prevent members passing through a pipe from flowing out to the outside at a connecting part, prevent corrosion of the end face of the connecting part, and concentricity of the pipe bodies to be connected. The purpose of the present invention is to provide a connecting structure for concrete pipes that can be held on top.

[Means to solve the problem]

Means for achieving the above object will be described with reference to drawings corresponding to embodiments.

That is, the present invention provides a socket 3 and a socket 4 at each end of a pair of concrete pipes, and connects the socket 3 by fitting the outer periphery of the socket 3 into the inner periphery of the socket 4. In the concrete pipe connection structure, lining layers 5 and 6 made of plastic plate lining are formed on the entire inner peripheral surface of each of the pair of concrete pipes, and the lining layers 5 and 6 are formed on the end faces of the insertion port and the socket. In the recess formed on the inner circumferential side, one and the other annular support frames 7 and 8 made of synthetic resin are placed, the inner circumferential surfaces of which are in close contact with the inner circumferential surfaces of the lining layers 5 and 6, The end face, the end face of the concrete pipe body, and the end face of the lining layers 5 and 6 are buried in a flat continuous state in the diametrical direction, and between the outer periphery of the socket 3 and the inner periphery of the socket 4. ,
A first annular elastic member 15 made of an O-ring is attached, and between the end faces of the one and the other annular support frames 7 and 8, there is a second elastic member made of synthetic resin having a hollow part with a slit-shaped cross section along the diameter direction. annular elastic member 10,
10 are adhered with adhesives 11 and 12, a protrusion 13 is formed on one surface of the second annular elastic member 10 and 110, and the protrusion 13 is formed on the end surface of the other annular support frame 8. It is characterized in that it is fitted and bonded into the recessed portion 9.

[Function] According to the above means, the liquid, gas, etc. passing through the pipe bodies 1 and 2 are prevented from flowing into the end faces by the second annular elastic member 10 adhesively fixed to the end faces of the connecting portions. In addition to preventing leakage to the outside,
Corrosion of the end faces of the tubes 1 and 2 can be prevented. Further, by bonding the second annular elastic member 10 via the annular frame members 7 and 8 made of resin, the adhesion strength is improved and corrosion can be further prevented. Furthermore, even if the tube bodies 1 and 2 are displaced due to subsidence of the conduit and the gap between the end faces of the connecting portion widens, the second annular elastic member 10 deforms elastically and the adhesion with the end faces is maintained. Therefore, the above effect is not impaired. Moreover, the first annular elastic member 15 can hold both the connected tube bodies 1 and 2 concentrically. Furthermore, by forming the hollow portion 14 in the radial direction approximately at the center in the thickness direction of the second annular elastic member 10, elastic deformation can be facilitated. Further, a protrusion 13 is formed on one surface of the second annular elastic member 10, and this protrusion 13 is fitted and bonded into a recess 9 previously formed on one end surface of the annular frame members 7 and 8 before connection. Accordingly, the work of connecting the tube bodies 1 and 2 can be facilitated.

[Example] Hereinafter, an example of the concrete pipe connection structure according to the present invention will be described.

An embodiment of the present invention is shown in FIGS. 1 to 3.
Pipe body 1 of concrete pipe made of Huyum pipe etc.
At both ends of 2, there is a socket 3 with a reduced outer diameter.
A socket 4 with an enlarged inner diameter is provided.
Then, the insertion port 3 is fitted into the socket 4 and the tube bodies 1 and 2 are inserted.
is connected. Corrosion-resistant lining layers 5 and 6 made of plastic plate linings are formed on the inner peripheral surfaces of the tubes 1 and 2, respectively. As the plastic plates used as the lining layers 5 and 6, those having a large number of parallel protrusions formed on the wall surfaces of the tubes 1 and 2 along the tube axis direction can be used. Annular support frames 7 and 8 made of corrosion-resistant plastic are embedded in opposing end faces of the connecting portions of the tubes 1 and 2, respectively. The inner peripheral sides of the lining layers 8 extend and are in close contact with the outer peripheral surfaces of the lining layers 5 and 6, respectively. Further, the opposing surfaces of the one and the other support frames 7 and 8 are buried so as to be substantially flush with the end surfaces of the tube bodies 1 and 2, respectively, and the other support frame provided on the tube body 2 on the side of the socket 4 is buried. On the surface of the frame 8, an annular recess 9 is formed that is U-shaped or widens in the circumferential direction. A second annular elastic member 10 made of corrosion-resistant rubber or the like is sandwiched between the opposing surfaces of the one and other support frames 7 and 8. facing surface and adhesive 1
1 and 12, respectively. The width of the second annular elastic member 10 in the radial direction is
The width of the other support frame 8 is approximately equal to the width of the other support frame 8, and the width of the other support frame 8 is approximately equal to the width of the other support frame 8.
An annular protrusion 13 is provided on the surface facing the support frame 8 and is fitted into and adhered to the recess 9 formed in the other support frame 8. The protrusion 13 can have a U-shape corresponding to the shape of the recess 9 or a shape that widens toward the tip. Furthermore, a second annular elastic member 1
0 has a hollow tube shape, and a hollow portion 14 is formed in the radial direction approximately at the center in the thickness direction. In a natural state, this hollow portion 14 is bulged out as shown in FIG. 2, and in a normal inserted state, it is compressed and elastically biased as shown in FIG. A first annular elastic member 15 made of an O-ring made of corrosion-resistant rubber or the like is sandwiched between the outer circumference of the insertion port 3 and the inner circumference of the socket 4.

Next, the operation of this embodiment will be explained. The protrusion 13 of the second annular elastic member 10 is fitted in advance into the recess 9 of the other support frame 8 embedded in the tube body 2 on the side where the socket 4 is formed, and the second annular elastic member 10 and the other support frame 8 are adhesively sealed with an adhesive 12. When connecting the tubular bodies 1 and 2, the insertion port 3 of the tubular body 1 is fitted into the socket 4 of the tubular body 2 via the first annular elastic member 15. The surface of one support frame 7 and the second annular elastic member 10
and the side surfaces thereof are adhesively sealed with adhesive 11. As a result, each end surface of the tubes 1 and 2 is completely covered and sealed by the second annular elastic member 10 and the one and the other support frames 7 and 8, so that the liquid passing through the tubes 1 and 2 is Gas and the like will not flow between the end faces, and corrosion can also be prevented. Further, since the inner circumferential surfaces of the tubes 1 and 2 are covered with corrosion-resistant lining layers 5 and 6, they will not corrode. Furthermore, since the second annular elastic member 10 is formed with a hollow portion 14, even if relative displacement occurs between the tube bodies 1 and 2 due to subsidence of the conduit, the airtightness will not be impaired. Can be elastically deformed. Also, the first annular elastic member 15
This allows the tube bodies 1 and 2 to be held concentrically.

According to this embodiment, corrosion can be prevented on the inner circumferential surfaces of the tubes 1 and 2 by the lining layers 5 and 6, and by the second annular elastic member 10 between the end surfaces. It is also possible to prevent gas from flowing out to the outside at the connection. Furthermore, even when the tubes 1 and 2 are displaced relative to each other, the connectivity is not impaired, and the tubes 1 and 2 can be held concentrically by the first annular elastic member 15.

FIG. 4 shows a second annular elastic member 110 according to another embodiment. In this embodiment, the second annular elastic member 110 has a U-shaped cross section.

Furthermore, the connection structure of the present invention can also be applied to a connection structure of concrete pipe bodies using a collar joint as shown in FIG.

In FIGS. 4 and 5, parts corresponding to the embodiments in FIGS. 1 to 3 are given the same reference numerals, and detailed explanations thereof are omitted.

〔Effect of the invention〕

As explained above, according to the concrete pipe connection structure according to the present invention, the second annular elastic member has a hollow portion with a slit-shaped cross section along the diameter direction on the opposing end surfaces of the pair of pipes. 10 and 110 were adhered with adhesives 11 and 12, and a first annular elastic member 15 made of an O-ring was installed between the outer periphery of the socket provided at each end and the inner periphery of the socket. Therefore, the second annular elastic member prevents the member passing through the tube from flowing out to the outside at the connecting portion, thereby preventing corrosion of the end face of the connecting portion, and the connected tube is connected to the first annular elastic member. This has the effect of being able to be held concentrically by the repulsive force of the members.

Further, according to the present invention, one and the other annular support frames 7 and 8 made of resin are formed on the opposing end surfaces of the pair of tubes, and the inner circumferential surfaces thereof are made of plastic lining layers 5 and 6 that are the inner walls of the tubes. The annular support frame 7, which is buried in such a manner that it is in close contact with the inner circumferential surface of the concrete pipe, and that its end face, the end face of the concrete pipe body, and the end face of the lining layers 5, 6 are flat and continuous in the diametrical direction.
a second annular elastic member 1 having a hollow section with a slit-shaped cross section along the diameter direction between opposing end surfaces of the second annular elastic member 1;
0 and 110 are bonded with adhesives 11 and 12, the force that causes the pair of tubes to move in opposite directions in the axial direction and create a gap between the tubes and the support frames 7 and 8 is reduced. Even if the pipe body is moved between the end faces of the pipe, the gap is closed by the lining layers 5 and 6, and there is no corrosion due to liquid leakage from this part.
The second annular elastic member 10, 110 is absorbed by the slit of the second annular elastic member 10, 110.
The connection between the tube and the end surface of the tube is strong because the protrusion 13 is fitted into the recess 9 and bonded to the end surface of the tube by layers of adhesive 11 and 12 through the resin support frames 7 and 8. This has the effect of reliably preventing corrosion caused by liquid leakage in concrete pipes.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of the main parts showing one embodiment of the concrete pipe connection structure according to the present invention, Fig. 2 is a cross-sectional view showing the natural state of the second annular elastic member, and Fig. 3 is the present embodiment. FIG. 4 is a cross-sectional view of a second annular elastic member according to another embodiment, and FIG. 5 is an enlarged cross-sectional view of a main part of another embodiment. 1, 2...Pipe body, 3...Socket, 4...Socket,
5, 6... Lining layer (corrosion resistant layer), 7, 8...
... Support frame (annular frame member), 9 ... Recess, 10, 1
DESCRIPTION OF SYMBOLS 10... Second annular elastic member, 11, 12... Adhesive, 13... Protrusion, 14... Hollow part, 15...
...First annular elastic member.

Claims (1)

[Scope of Claims] 1. A socket 3 and a socket 4 are provided at each end of a pair of concrete pipes, and the outer periphery of the socket 3 is fitted into the inner periphery of the socket 4. In the connection structure of the concrete pipes to be connected, lining layers 5 and 6 made of plastic plate lining are formed on the entire inner peripheral surface of each of the pair of concrete pipes, and the end faces of the insertion port and the socket are One and the other annular support frames 7 and 8 made of synthetic resin are placed in the recesses formed on the inner circumferential side of the lining layers 5 and 6 so that their inner circumferential surfaces are in close contact with the inner circumferential surfaces of the lining layers 5 and 6. , the end face of the concrete pipe body and the end face of the lining layers 5 and 6 are buried in a flat continuous state in the diametrical direction, and between the outer periphery of the socket 3 and the inner periphery of the socket 4. teeth,
A first annular elastic member 15 made of an O-ring is attached, and between the end faces of the one and the other annular support frames 7 and 8, there is a second elastic member made of synthetic resin having a hollow part with a slit-shaped cross section along the diameter direction. annular elastic member 10,
110 are bonded with adhesives 11 and 12, a protrusion 13 is formed on one surface of the second annular elastic member 10 and 110, and the protrusion 13 is formed on the end surface of the other annular support frame 8. A concrete pipe connection structure characterized in that the concrete pipe body is fitted and bonded into a recessed part 9.