JP2828167B2 - Concrete pipe joining method and concrete pipe joining structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for connecting concrete pipes mainly used as sewer pipes, drain pipes, drainage culvert pipes, agricultural and industrial water pipes, intake pipes, and the like, and a joint structure for the pipes. .

[0002]

2. Description of the Related Art Since the above-listed concrete pipes cannot be manufactured indefinitely, a large number of pipes of a fixed length are manufactured, and these pipes are arranged in the length direction or in a direction perpendicular to each other according to the purpose. We use by joining. FIG. 9 shows a conventional concrete pipe connection method. FIG. 9 (A) shows a method of joining a tube without a socket portion, and FIG. 9 (B) shows a method of joining a tube with a socket portion. In the joining method shown in FIG.
After applying a lubricant to the joint of the pipes 100 and 102 to be joined, a resin mortar or cement mortar 104 is applied to the joint. Further, as shown in FIG. 9B, in the case of a tube having a socket portion formed at a joint portion,
First, the bonding agent 10 is applied to the inner peripheral surface of the socket 106 of the pipe 100.
8 is applied, and then the rubber ring 110 is inserted into the inside of the bonding agent, and then the tube 102 is inserted into the inside.

[0003]

In the conventional joining method shown in FIG. 9A, since cement mortar does not have elasticity, there is a problem that if the pipe is displaced, the watertightness is reduced. In the joining method shown in FIG. 9B,
When the pipe is not completely inserted, there is a problem that a gap is formed and watertightness is reduced.

[0004] In order to solve the above problems, an object of the present invention is to provide a joining method capable of joining tubes by a completely new method and a joint structure of the tubes. More specifically, the object of the present invention is to provide a joining method and a joining structure of pipes that facilitate joining work of pipes and that can join pipes at a certain angle. It is in.

[0005]

SUMMARY OF THE INVENTION According to one aspect of the present invention, there is provided a method for joining concrete pipes, comprising the steps of: placing a concrete pipe to be connected in abutment in a longitudinal direction; Enclosing the sealant with a heat-melting material, enclosing the outer periphery of the sealant with watertight means having an internal hollow, and injecting an alumina cement powder mixed with water into the internal hollow of the watertight means. And the outer periphery of the watertight means is fastened with a clip,
Transferring the heat generated by the alumina cement powder mixed with water to the sealing material.

In the present invention, the alumina cement powder generates heat and expands due to a chemical reaction with water. At this time, since the alumina cement powder generates heat, the sealing material is almost in a molten state. In the present invention, the joining effect of the pipe is obtained by causing the sealing material in a molten state to penetrate into the joining portion of the concrete pipe by the expansion force of the alumina cement powder.

According to another aspect of the present invention, there is provided a method for joining concrete pipes, wherein the concrete pipes to be connected are arranged in contact with each other in the longitudinal direction, and the outer periphery of the joint portion of the concrete pipes is melted by heat. A step of surrounding with a sealing material made of a material, a step of preparing a water-tight means having an internal hollow, and a step of injecting an alumina cement powder into the internal hollow, and a method of water-tight in which an alumina cement powder is injected into the outer periphery of the sealing material Enclosing with water, supplying water to the inner hollow of the watertight means, fastening the outer periphery of the watertight means with a clip, and generating heat of the alumina cement powder mixed with water in the inner hollow of the watertight means as a sealing material. And transmitting to the user. In this case, since the water-tight means surrounds the outer periphery of the sealing material in a state where the alumina cement powder body is previously filled therein, the connection effect of the concrete pipe of the present invention can be obtained by supplying only water. Therefore, the mounting operation is simple.

[0008] A concrete pipe joint structure according to the present invention comprises a sealing material made of a material which melts by heat and surrounds an outer periphery of a connecting portion of a concrete pipe arranged in contact with a longitudinal direction; A watertight means surrounding the outer periphery and having an inner hollow into which the alumina cement powder is injected, and surrounding the sealing material and capable of transmitting heat generated in the inner hollow to the sealing material, and arranged on the outer periphery of the watertight means, And a circumferentially tightening clip. A pressure increasing member may be arranged in the hollow inside of the watertight means so as to apply the expansion force of the alumina cement powder expanding when mixed with water to the outer peripheral portion of the concrete pipe. In this case, since the expansion force of the alumina cement powder is all applied to the outer peripheral portion of the concrete pipe, a sufficient amount of the molten sealing material can penetrate into the joint portion of the concrete pipe.

[0009] The hollow inside of the watertight means may be bisected in the longitudinal direction of the concrete pipe to be joined. In this case, it is possible to prevent the pocket from becoming cylindrical due to the expansion of the alumina cement powder. In addition, the connection effect of the concrete pipe of the present invention can be obtained with a simple structure, and handling is easy. The pressure increasing member may be crank-shaped. This structure is effective when the concrete pipe to be connected has a socket.

The clip may be a pair of band members or a single plate. The watertight means is preferably made of a waterproof cloth. A tying member for temporarily fixing the clip to the band body at the time of pipe connection construction may be further provided. In this case, the work of attaching the watertight means becomes easy.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. First Embodiment FIG. 1 is a perspective view of a pipe joint structure according to a first embodiment of the present invention, and 2 denotes a clip. FIG. 2 shows a watertight means of the pipe joint structure. The clip 2 has a structure in which band-shaped band members 4 arranged in two rows are connected to each other by a transverse member 6, and fastening plates 8 are provided at both ends of the band members so that these band members act as clips. Has been fixed. Depending on the amount and direction of rotation of the screw 10 passing through the fastening plate 8, it is possible to increase or decrease the inner diameter of the arc while the band 4 is formed in an arc.

The clip 2 is substantially provided with a watertight means 12 which is arranged so as to surround the outer peripheral surface of the joint of the pipes to be joined.
It is for tightening the outer surface of. In this embodiment, other tightening means (not illustrated) can be used. The watertight means 12 includes a seal member 14 made of a material which is arranged so as to surround the outer surface of the joint portion of the concrete pipe and becomes soft by heat, and the seal member 1.
4 includes a pocket 18 in which an alumina cement powder body 16 which is adhered to one side surface and is circumferentially restrained by the clip 2 and expands while emitting high-temperature heat by a chemical reaction with water is contained therein.

As the seal member 14, asphalt rubber which becomes soft by high heat can be used, and as the pocket 18, a waterproof cloth which allows air but not moisture can be used. A pressure increasing member 20 is provided inside the pocket 18. When the alumina cement powder 16 existing in the pocket 18 expands due to a chemical reaction with water, the expansion force is entirely transmitted to the seal member 14 by the pressure increasing member 20. The pressure increasing member 20 is formed by pressing a metal plate having a thickness of 1 mm or more into a U-shape, and further processing the metal plate into a circular shape. Pressurizing member 2 thus processed
No. 0 is inserted into the pocket 18 so that the opening faces the sealing material 14 side.

FIG. 3 shows that two concrete pipes A and B are brought into contact in the longitudinal direction, and the watertight means 12 according to the first embodiment of the present invention is arranged so as to surround the outer peripheral side of the joining portion of these pipes. Further, a state in which the clip 2 is arranged and the tightening work of the watertight means is performed is shown. Here, first, in a state where the two concrete pipes are in contact with each other in the longitudinal direction, the sealing material 14 is arranged so as to be wound around the joining portion of the pipes, and then the pocket 18 is arranged on the outer periphery of the sealing material 14. The pocket 18 is entirely circular because the metal pressure increasing member 20 disposed inside the pocket 18 is processed into a circular shape. Therefore, at the time of attachment, this pressure increasing member 20
Can be extrapolated with both ends widened.

In this state, the alumina cement powder mixture mixed with water in another container may be injected into the pocket 18 of the watertight means 12. At this time, when mixed with water, the alumina cement powder causes a chemical reaction to generate heat and expand. While the alumina cement powder body expands, the clip 2 according to the first embodiment of the present invention is arranged so as to surround the outer peripheral side of the watertight means 12, and the fastening plates 8 fixed to both ends of the band body 4 are screwed together with the screws 10. To conclude.

In such a state, the alumina cement powder body 16 which has expanded while generating heat in the pocket 18 is surrounded on the outer peripheral side by the pressure increasing member 20 made of a metal material, and the pressure increasing member 20 is , The expansion force of the alumina cement powder is transmitted to the outer peripheral sides of the concrete plates A and B.
As a result, the alumina cement powder 16 becomes the sealing material 14.
At this time, since the alumina cement powder body 16 generates heat to approximately 90 ° C. at this time, the sealing material 14 is almost in a molten state.

As described above, the sealing material 14 is brought into a molten state, and a pressing force is applied from the outer peripheral side to the inner peripheral side of the sealing material 14 in the molten state. As shown in FIG. This sealing material 1
4 penetrates. Since such an operation is performed over the entire circumference of the joint portion of the pipe, the joint portion of the concrete pipe is in a connected state where water leakage can be completely prevented. Although the alumina cement powder 16 hardens after a certain period of time, sand may be mixed with the alumina cement powder in order to obtain a hardened hardened state.

FIG. 5 shows a state in which both ends of the pocket 18 of the watertight means 12 are folded and brought into contact with each other, the iron piece 22 is arranged at the contact position, and the clip 2 is tightened. Such a structure is effective for preventing the alumina cement powder body 16 from expanding and flowing out from both ends of the pocket 18. Second Embodiment FIG. 6 is a cross-sectional view showing a state in which pipes are connected using a pipe joint structure according to a second embodiment of the present invention. The structure in this embodiment can be used when the concrete pipe to be connected has a socket part. When the other tube B is inserted into the socket portion 24 formed on one tube A, a step is generated in the connection portion because the socket portion 24 is formed. Therefore, in this embodiment, the pressure increasing member 26 corresponding to the pressure increasing member 20 of the first embodiment is processed into a crank shape and arranged in the pocket 28. Then, the outer peripheral portion of the pocket 28 located outside the socket portion 24 and the outer peripheral portion of the pocket located outside the tube B are fastened and fixed by the clips 2 respectively.

The principle of the connection method of this embodiment is the same as that of the first embodiment, except that the sealing material 14 is arranged in a crank shape at the joint of the pipes. In this case, as the sealing material 14 is melted, it penetrates between the inner peripheral surface of the socket portion 24 and the outer peripheral surface of the tube B, and the tube is securely connected. Third Embodiment FIGS. 7 and 8 show a joint structure for pipes according to a third embodiment of the present invention. This structure is characterized in that the pressure increasing member used in the pipe joining structure in the first embodiment is not used. Instead of using no pressure augmentation member, another pocket 30 is used in the pocket 18 of the watertight means 12. The inside of the pocket 30 is divided into two parts in the longitudinal direction, and such a structure is effective in preventing the alumina cement powder injected into the inside of the pocket from turning the pocket into a cylindrical shape.

In this embodiment, unlike the first embodiment, the band body of the clip 2 is a single plate member 32. This is to obtain the effect when the pressure increasing member is used. The pocket 30 is a pocket 1 according to the first embodiment in a state where the alumina cement powder is contained therein.
8 and fixed by the plate 32 of the clip 2 to form a single structure.

A binding member 34 is attached to the plate member 32. In the first embodiment, since the pressure increasing member has a circular shape, there is no particular problem when surrounding the joint of the concrete pipe. However, in this embodiment, it is difficult to make the plate member 32 circular because the pressure increasing member is not used.
4 is used.

That is, as in the first embodiment, first, the outer periphery of the joint portion of the concrete pipe is surrounded by the sealing material,
What is necessary is just to temporarily bind both sides of the plate material using the binding member 34 with the outer periphery of the sealing material being surrounded by the plate material 32 of the clip 2 (see FIG. 7). At this time, since only the alumina cement powder body is contained in the pocket 30, it is sufficient to inject only water, but for that purpose, the plate material 32 must be fixed at both ends and spread.
Therefore, the binding member 34 is fixed to the plate at a certain distance from both ends of the plate.

In the pipe joint structure of this embodiment, the first
The same effects as in the embodiment can be obtained. Further, in this embodiment, the structure is simple and the handling is easy since the metal pressure increasing member inserted into the pocket is not used. Furthermore, since the alumina cement powder body is present in the internal pocket, the work is easy because only water needs to be injected at the time of installation.

[0024]

According to the pipe joining method and the pipe joining structure of the present invention, when two pipes are joined, the joint can be sufficiently sealed. Therefore, it is possible to solve the problem of the prior art that water leaks through the connection portion of the pipe, and to fundamentally solve the problem of the prior art pipe connection method particularly when applied to a high-pressure water pipe. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pipe joint structure according to the present invention.

FIG. 2 is a cutaway perspective view of the watertight means of the pipe joint structure according to the present invention.

FIG. 3 is a perspective view showing a state in which the pipes are connected by the pipe joint structure according to the present invention.

FIG. 4 is a cross-sectional view showing a state where the pipes are connected by the pipe joint structure according to the present invention.

FIG. 5 is a sectional view of a connecting portion of the pipe joint structure according to the present invention.

FIG. 6 is a cross-sectional view showing a pipe joint state of a pipe joint structure according to another embodiment of the present invention.

FIG. 7 is a perspective view of a pipe joint structure according to still another embodiment of the present invention.

8 is a cross-sectional view of the pipe joint structure shown in FIG. 7;

FIG. 9 is a diagram for explaining a conventional technique in the technical field according to the present invention.

[Explanation of symbols]

 2 clip 4 band body 6 crossing member 8 fastening plate 10 screw 12 watertight means 14 sealing material 16 powder body 18 pocket 20 pressure increasing member 22 iron piece 24 socket portion 26 pressure increasing member 28 pocket 30 pocket 32 single plate material 34 binding member A and B tubes

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 13/12

Claims (9)

(57) [Claims] A step of arranging a concrete pipe to be connected so as to abut in a longitudinal direction, and melting an outer periphery of a connection portion of the concrete pipe by heat.
Implanting the steps of surrounding at composed sealant in that material, a step of enclosing in a watertight means having a hollow interior an outer periphery of the sealing material, the internal hollow to be mixed with water alumina cement powder of said watertight means And fastening the outer periphery of the watertight means with a clip and mixing with the water
Heat generated by the alumina cement powder
To the concrete material , and a concrete pipe joining method. A step wherein abut the concrete pipe to be connected in the longitudinal direction to arrange, to melt the outer periphery of the connecting portion of the concrete pipe by heat
Enclosing with a sealing material made of a material, preparing water-tight means having an inner hollow, injecting an alumina cement powder into the inner hollow, and injecting the alumina cement powder around the outer periphery of the sealing material. a step of enclosing in a watertight means being, a process of supplying water to the interior hollow of said watertight means, signed a periphery of said watertight means with a clip, said watertight means
Alumina cement powder mixed with water in the internal hollow of
Co comprising the steps of transferring the heat generated in the sealing material, the
How to join concrete pipes. 3. A concrete that is arranged in abutment in the longitudinal direction.
Material melted by the heat surrounding the outer periphery of the connecting portion bets tube
And a hollow surrounding the periphery of the sealing material and into which the alumina cement powder is injected , and surrounding the sealing material.
And the heat generated in the internal hollow is transmitted to the sealing material.
And water sealing member capable reaches said is disposed on the outer periphery of the water sealing member connection structure of the concrete pipe comprising a clip to tighten the water sealing member in the circumferential direction. 4. A pressure increasing member is disposed inside said watertight means so as to apply an expanding force of an alumina cement powder expanding by being mixed with water to an outer peripheral portion of said concrete pipe. The concrete according to claim 3,
Joint structure of the heat pipe. 5. An inner hollow of the watertight means is provided with a connecting member.
The concrete pipe joint structure according to claim 3, which is divided into two in the length direction of the cleat pipe . 6. The concrete pipe jointed structure according to claim 4, wherein said pressure increasing member has a crank shape. 7. The concrete pipe joint structure according to claim 3, wherein the clip is formed of a pair of band members or a single plate. 8. The concrete pipe joint structure according to claim 3, wherein said watertight means is made of a waterproof cloth. 9. The concrete pipe joint structure according to claim 7, further comprising a binding member for temporarily fixing the clip to the band body during pipe connection construction.