JPH0932979A - Coupling structure of composite pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution of a coupling part as sufficient watertight ability is ensured by a method wherein the first and second engaging parts of first and second composite pipes are engaged with each other through a first seal part and the first and second fit-in parts are fitted in each other through a second seal part. SOLUTION: A first engaging part 8A is formed at the end part on one sides of the first outer pipe 4A of a first composite pipe 2A and a second engaging pipe 8B engaged with the first engaging part 8A is formed at the end part on the other end of the second outer pipe 4B of a second composite pipe 2B. A first fit-in part 10A is formed at the end part on one side of the first inner pipe 6A of the first composite pipe 2A, and a second fit-in part 10B fitted in the first fit-in part 10A is formed at the end part on the other end side of a second inner pipe 6B of the second composite pipe 2B. When the first and second composite pipes 2A and 2B are interconnected, the first and second engaging parts 8A and 8B are engaged with each other through a first seal means 12, and the first and second fit-in parts 10A and 10B are fitted in each other through a second seal means 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a composite pipe, and in particular, ensures sufficient water tightness at the joint portion of the composite pipe consisting of an outer pipe made of concrete and an inner pipe made of synthetic resin such as PVC. At the same time, it relates to a joint structure of a composite pipe having a simplified structure.

[0002]

2. Description of the Related Art Composite pipe is made of concrete outer pipe and PV.
An inner pipe made of synthetic resin such as C is used, and the inside of the composite pipe after being buried in the ground is used as a fluid passage or a telephone or electric wiring space.

Further, the composite pipe has an advantage that, when the outer pipe made of concrete is damaged due to the deformation of the earth's crust after being buried, the inner pipe made of a synthetic resin having flexibility can ensure the communication state. .

[0004]

By the way, conventionally, not only the composite pipe but also the pipe material is required to have sufficient watertightness at the connecting portion, that is, the joint portion.

However, in general, in the composite pipe, no special consideration is given to the connection between the outer pipes made of concrete and the connection between the inner pipes made of synthetic resin, and the water tightness is secured at both connection points. However, there is a disadvantage that the reliability of the joint is low. In the above-mentioned composite pipe, when the inner pipe end is located outside the connection part of the outer pipe, there is a risk that water will enter between the outer pipe and the inner pipe. There is an inconvenience such as peeling.

Further, if special joint members are used at both connection points in order to improve the reliability of the joint portion, the structure becomes complicated, the manufacture is difficult, the cost becomes large, and it is economically disadvantageous. There is inconvenience.

Therefore, a joint structure having a simple structure and high reliability is desired.

[0008]

In order to eliminate the above-mentioned factors, the present invention provides a composite pipe having an outer pipe made of concrete and an inner pipe made of synthetic resin, in which the first outer pipe of the first composite pipe is A first engaging portion is formed at one end side end portion, and a second engaging portion that engages with the first engaging portion is formed at the other end side end portion of the second outer pipe of the second composite pipe; A first fitting part is formed at one end of the first inner pipe of the first composite pipe, and the first fitting part is fitted at the other end of the second inner pipe of the second composite pipe. When forming two fitting parts and connecting the one end side end of the first composite pipe and the other end side end of the second composite pipe, the first and second composite pipes
It is characterized in that the engaging portion is engaged through the first sealing means and the first and second fitting portions of the first and second composite pipes are fitted through the second sealing means. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
When connecting the one end side end of the first composite pipe and the other end side end of the second composite pipe, the first and second engaging parts of the first and second composite pipes are connected to the first sealing means. While engaging through the first,
The first and second fitting portions of the second composite pipe are fitted through the second sealing means to ensure sufficient water tightness while simplifying the structure of the joint portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 show a first embodiment of the present invention. In FIGS. 1 and 2, reference numeral 2 is a cylindrical composite pipe.

This composite pipe 2 is an outer pipe 4 made of concrete.
And an inner pipe 6 made of a synthetic resin, the outer end of the outer pipe 4 has a large outer diameter, and the other end of the outer pipe 4 is inserted. The outer diameter of the side connection end 4b is formed to be small.

When connecting the two composite pipes 2A and 2B, a first engaging portion 8A is formed at one end of the first outer pipe 4A of one of the first composite pipes 2A, while the other is formed. Second
A second engagement portion 8B that engages with the first engagement portion 8A is formed at the other end side end portion of the second outer pipe 4B of the composite pipe 2B.

Further, the first fitting portion 10A is formed at one end of the first inner pipe 6A of the first composite pipe 2A, and the second fitting pipe 10A
A second fitting portion 10B that fits into the first fitting portion 10A is formed at the other end of the second inner pipe 6B of the composite pipe 2B.

Furthermore, when connecting the first composite pipe 2A and the second composite pipe 2B, the first and second composite pipes 2A, 2B
The second engaging portions 8A and 8B are engaged with each other via the first sealing means 12, and the first and second fitting portions 10A and 10B of the first and second composite pipes 2A and 2B are engaged with the second sealing means 14. It is configured to be fitted via.

More specifically, as shown in FIG. 1, the outer diameter of the one end side end of the first outer tube 4A of the first composite tube 2A is formed to be large, and the inner surface of the first outer tube 4A is formed. From the end side,
Formed in the enclosing portion 16 for enclosing the first sealing means 12 made of a rubber ring, the first engaging portion 8A for inserting and engaging the second engaging portion 8B, and the first inner pipe 6A. An accommodation recess 18 for accommodating an annular projection 22 described later is formed.

Also, the second outer tube 4B of the second composite tube 2B.
The outer diameter of the other end of the
An external fitting portion for externally fitting the second engaging portion 8B, which is inserted into and engaged with the first engaging portion 8A, and the first sealing means 12 made of a rubber ring, from the end portion side of the outer surface of the outer tube 2B. And 20.

Further, the first inner pipe 6A of the first composite pipe 2A
The first fitting portion 10A having the annular convex portion 22 is formed at the end portion.

The first fitting portion 10A has an annular projection 22 formed near the end of the first inner pipe 6A, and the annular projection 22.
And a contact for contacting the outer periphery of the second inner pipe 6B on both sides of the annular convex portion 22 and the enclosing concave portion 24, which is formed on the inner surface of the enclosing portion and encloses the second sealing means 14 formed of a rubber ring. And a surface portion 26.

Also, the second fitting portion 1 of the second composite pipe 2B.
0B is formed in a cylindrical shape having no unevenness.

Next, the operation will be described.

When connecting the first and second composite pipes 2A and 2B, as shown in FIG. 1, first and second sealing means 12,
When the second composite pipe 2B is inserted into the first composite pipe 2A via 14 the first engaging portion 8A of the first outer pipe 4A and the second outer pipe 4B.
Of the first inner pipe 6 while being engaged with the second engaging portion 8B of
The first fitting portion 10A of A and the second fitting portion 10 of the second inner pipe 6B
B is engaged, and the first and second composite pipes 2A and 2B are connected in a watertight state.

At this time, the first sealing means 12 is
The enclosing portion 16 of the first outer pipe 4A and the outer fitting portion 20 of the second outer pipe 4B.
The second sealing means 14 is disposed between
It is arranged between the holding recess 24 of the inner pipe 6A and the outer circumference of the second inner pipe 6B.

As a result, the first and second composite pipes 2A,
When connecting 2B, the first and second sealing means 12, 14
The first and second outer tubes 4A, 4B and the first and second inner tubes 6
It is possible to secure a reliable watertight state at the connection portion with A and 6B, and improve the reliability of the joint portion, which is practically advantageous. At this time, the first inner pipe 6A and the second inner pipe 6
The engagement state with B is configured so as to be slidable in the axial direction, and the expansion and contraction operation of the connection portion at the time of crustal movement can be permitted.

Further, since the joint portions of the first and second composite pipes 2A and 2B have a simple structure, the manufacture is easy, the cost can be reduced, and it is economically advantageous.

Further, when connecting the first and second composite pipes 2A and 2B, the second composite pipe 2B is inserted into the first composite pipe 2A through the first and second sealing means 12 and 14. Only this is sufficient, and the connection workability can be improved.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, portions that perform the same functions as those in the first embodiment will be described with the same reference numerals.

The feature of this second embodiment is that a drop-out preventing portion 32 for preventing the second seal means 14 from falling off is formed on the outer peripheral surface portion of the second inner pipe 6B.

That is, at the outer peripheral surface portion of the second inner pipe 6B, as shown in FIG. 3, two drop-out preventing portions 32 having an annular projection shape are formed, and the second seal means 14 is provided in the drop-out preventing portion 32. Is to be positioned.

By the way, when the first composite pipe is inserted into the first composite pipe through the first sealing means and the second sealing means 14 when connecting the first and second composite pipes, the first outer pipe First of
The engaging portion is engaged with the second engaging portion of the second outer pipe, and the first fitting portion 10A of the first inner pipe 6A and the second fitting portion 10B of the second inner pipe 6B are engaged with each other. Combined, the first and second composite pipes 2
A and 2B are connected to each other in a watertight state, and the second seal means 14 can be surely prevented from falling off during the insertion work by the fall prevention part 32, and the usability can be improved. At this time, the engagement state of the first inner pipe 6A and the second inner pipe 6B is configured to be slidable in the axial direction, and similar to the first embodiment, the connection at the time of crustal movement is connected. The expansion / contraction motion of the part can be permitted.

When connecting the first and second composite pipes, the first and second outer pipes and the first and second inner pipes 6A and 6B are connected by the first and second sealing means 14. Since it is possible to secure a reliable watertight state at the connection portion, the reliability of the joint portion can be improved, which is practically advantageous, as in the case of the first embodiment described above.

Further, since the joint portions of the first and second composite pipes are simple in structure, as in the case of the first embodiment described above, the manufacture is easy, the cost can be reduced, and it is economical. Is advantageous to.

Furthermore, when connecting the first and second composite pipes, it is only necessary to insert the second composite pipe into the first composite pipe through the first sealing means and the second sealing means 14, and Similar to the first embodiment, the connection workability can be improved and the connection state can be prevented from being released.

FIG. 4 shows a third embodiment of the present invention.

The feature of the third embodiment is that the fitting positions of the first inner pipe 6A and the second inner pipe 6B are reversed, and the first inner pipe 6A has a protrusion-shaped first fitting. Joint part 4
2A is formed, and a hook-shaped second fitting portion 42B that is locked to the first fitting portion 42A is formed on the second inner pipe 6B.

That is, as shown in FIG. 4, the second inner pipe 6B is fitted to the outer peripheral surface of the first inner pipe 6A. At this time, when the material of the second inner pipe 6B cannot expand and contract a little, the hook-shaped second fitting portion 42B of the second inner pipe 6B is formed.
It is also possible to form a plurality of slits (not shown) extending in the axial direction in the vicinity to facilitate the fitting operation.

Further, as shown in FIG. 4, the first inner pipe 6A is
A first fitting portion 42A having a ring shape and protruding gradually from the end side toward the outer side is formed on the outer peripheral surface of the second inner pipe 6B, and the inner surface of the second inner pipe 6B gradually protrudes from the end side toward the central direction. And a hook-shaped second fitting portion 4 which is locked to the first fitting portion 42A.
Form 2B.

By the way, the first and second composite pipes 2A, 2
When connecting B, the second inner pipe 6B is fitted to the outer peripheral surface of the first inner pipe 6A, and the first fitting portion 42A having an annular and protruding shape and the second fitting portion 42B having a hook shape. By having the structure having the second outer pipe 4A and the first inner pipe 6A,
The inner tube 6B is inserted, and a firm connection state can be secured.

When connecting the first and second composite pipes 2A and 2B, the first and second sealing means 12 and 14 are used to connect the first and second outer pipes 4A and 4B to the first and second inner pipes. Tube 6A, 6
Since a reliable watertight state can be secured at the connection portion with B, the reliability of the joint portion can be improved, which is practically advantageous, as in the first and second embodiments.

Furthermore, when connecting the first and second composite pipes 2A and 2B, the second composite pipe 2B is inserted into the first composite pipe 2A through the first and second sealing means 12 and 14. It is sufficient to improve the connection workability as well as to contribute to preventing the connection state from being released, as in the first and second embodiments.

Furthermore, the first and second composite pipes 2A, 2
Since the structure of the joint portion B is simple, as in the case of the above-described first embodiment, the manufacturing is easy, the cost can be reduced, and it is economically advantageous.

FIG. 5 shows a fourth embodiment of the present invention.

The feature of the fourth embodiment is that there are a plurality of, for example, two, fitting portions in the above-described third embodiment.

That is, as shown in FIG. 5, the second inner pipe 6B is fitted to the outer peripheral surface of the first inner pipe 6A, and the outer peripheral surface of the first inner pipe 6A is annular and has an end portion side. The first and second fitting portions 52A-1 and 52A-2, which have a projection shape that gradually protrudes outward from the second end, are continuously formed, and the second
On the inner surface of the inner pipe 6B, hook-shaped third and fourth fitting portions that gradually project from the end side toward the center and are locked to the first and second fitting portions 52A-1 and 52A-2, respectively. 52B-1, 52
B-2 is formed continuously.

By the way, when connecting the first and second composite pipes, the second inner pipe 6B is fitted to the outer peripheral surface of the first inner pipe 6A, and the first and second annular and projecting shapes are formed. 2 fitting parts 52A-1, 52A-2 and hook-shaped third and fourth fitting parts 52
By having the configuration including B-1 and 52B-2,
Since the second inner pipe 6B is inserted between the first outer pipe and the first inner pipe 6A, a solid connection state can be secured as in the third embodiment.

When connecting the first and second composite pipes, the first sealing means and the two second sealing means 54-1 and
54-2, the first and second outer pipes and the first and second inner pipes 6
Since it is possible to secure a reliable watertight state at the connection portion with A and 6B, it is possible to improve the reliability of the joint portion, which is practically advantageous, as in the first to third embodiments. .

Further, when connecting the first and second composite pipes, the first sealing means and the two second sealing means 54-1,
It is only necessary to insert the second composite pipe into the first composite pipe via 54-2, and like the first to third embodiments described above,
Not only can the connection workability be improved, but it can also contribute to preventing the connection state from being released.

Furthermore, since the joint portion of the first and second composite pipes has a simple structure, the manufacture is easy and the cost can be kept low, which is economically advantageous.

FIG. 6 shows a fifth embodiment of the present invention.

The feature of the fifth embodiment is that when connecting the first and second composite pipes 2A and 2B,
An intermediate connecting member 62 that connects the second inner pipes 6A and 6B is provided.

That is, as shown in FIG. 6, on the outer peripheral surface of the first inner pipe 6A, a first fitting portion 64A having a ring shape and projecting outwardly from the end side is formed. 2 Also on the outer peripheral surface of the inner pipe 6B, a second fitting portion 64B that is annular and has a protrusion shape that gradually protrudes outward from the end side.
And an intermediate connecting member 62 that is engaged with the first and second fitting portions 64A and 64B.

Then, as shown in FIG. 6, the first and second fitting portions 64 are formed on the inner surfaces of both end portions of the intermediate connecting member 62.
Third and fourth fitting portions 64C and 64D are formed to project from the end side toward the center so as to be locked to A and 64B.

By the way, the first and second composite pipes 2A, 2
When connecting B, while fitting the third fitting portion 64C of the intermediate connecting member 62 to the outer peripheral surface of the first inner pipe 6A,
Also on the outer peripheral surface of the second inner pipe 6B, the fourth connecting member 62
With the configuration in which the fitting portion 64D is fitted, the first
Third and fourth fitting portions 64C of the intermediate connecting member 62 between the outer pipe 4A and the first inner pipe 6A and between the second outer pipe 4B and the second inner pipe 6B,
64D will be inserted respectively, and a firm connection state can be secured.

When connecting the first and second composite pipes 2A and 2B, the first sealing means 12 and the two second sealing means 66-1 and 66-2 and the first and second outer pipes are connected. 4A, 4B and the first and second inner pipes 6A, 6B and the intermediate connecting member 62 make it possible to secure a reliable watertight state at the connection portion, and the above-described first to fourth embodiments. Similar to the above, the reliability of the joint portion can be improved, which is practically advantageous.

Furthermore, when connecting the first and second composite pipes 2A and 2B, the first seal means 12 and the two second seal means 66-1 and 66-2 are placed in the first composite pipe 2A. Only by inserting the two composite pipes 2B, it is possible to improve the connection workability as well as to contribute to the prevention of disconnection of the connection state, as in the first to fourth embodiments.

Furthermore, the first and second composite pipes 2A, 2
Since the joint portion of B has a simple structure, it is easy to manufacture, the cost can be kept low, and it is economically advantageous.

The present invention is not limited to the above-mentioned first to fifth embodiments, and various application changes are possible.

For example, in the first to fifth embodiments of the present invention, the composite pipe 2 is described as having a cylindrical shape. However, as shown in FIG. 7, the outer pipe 74 of the composite pipe 72 is formed in a quadrangular cross section, and The inner tube 76 may have a cylindrical cross section.

Further, in the first to fifth embodiments of the present invention, one cylindrical space is formed in the inner pipe 6 of the composite pipe 2, but as shown in FIG. The outer pipe 84 of the pipe 82 is formed into a cylindrical shape, and the outer pipe 84
It is also possible to provide an inner tube 86 having a plurality of columnar space portions S therein and to use the space portions S properly according to the application. Further, as shown in FIG. 9, the outer pipe 94 of the composite pipe 92 is
The same applies to the case of forming a square shape.

[0060]

As described in detail above, according to the present invention, in a composite pipe having an outer pipe made of concrete and an inner pipe made of synthetic resin, one end portion of the first outer pipe of the first composite pipe is provided. Forming a first engaging portion on the second composite pipe
A second engaging portion that engages with the first engaging portion is formed at the other end side end portion of the outer pipe, and a first fitting portion is formed at the one end side end portion of the first inner pipe of the first composite pipe. At the same time, a second fitting portion that fits into the first fitting portion is formed at the other end side end portion of the second inner pipe of the second composite pipe.
When connecting the one end side end of the composite pipe and the other end side end of the second composite pipe, the first and second engaging parts of the first and second composite pipes are engaged via the first sealing means. In addition, the first and second fitting portions of the first and second composite pipes are fitted with each other via the second sealing means. Therefore, when connecting the first and second composite pipes, By the second sealing means, a reliable watertight state can be secured at the connection portion between the first and second outer pipes and the first and second inner pipes, and the reliability of the joint portion can be improved, which is practical. It is advantageous. In addition, since the structure of the joint portion of the first and second composite pipes is simple, the manufacture is easy, the cost can be reduced, and it is economically advantageous. Furthermore, when connecting the first and second composite pipes, the first and second composite pipes are connected.
It is only necessary to insert the second composite pipe into the first composite pipe via the sealing means, and the connection workability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic enlarged sectional view of a joint portion of a composite pipe showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a connected state of a composite pipe.

FIG. 3 is a schematic enlarged sectional view of a joint portion of a composite pipe showing a second embodiment of the present invention.

FIG. 4 is a schematic enlarged sectional view of a joint portion of a composite pipe showing a third embodiment of the present invention.

FIG. 5 is a schematic enlarged sectional view of a joint portion of a composite pipe showing a fourth embodiment of the present invention.

FIG. 6 is a schematic enlarged cross-sectional view of a joint portion of a composite pipe showing a fifth embodiment of the present invention.

FIG. 7 is a schematic perspective view of a connecting end portion of a composite pipe showing another first embodiment of the present invention.

FIG. 8 is a schematic perspective view of a connecting end portion of a composite pipe showing another second embodiment of the present invention.

FIG. 9 is a schematic perspective view of a connecting end portion of a composite pipe showing another third embodiment of the present invention.

[Explanation of symbols]

 2 composite pipe 2A first composite pipe 2B second composite pipe 4 outer pipe 4a one end side connection end 4b other end side connection end 4A first outer pipe 4B second outer pipe 6 inner pipe 6A first inner pipe 6B 2nd inner pipe 8A 1st engaging part 8B 2nd engaging part 10A 1st fitting part 10B 2nd fitting part 12 1st sealing means 14 2nd sealing means 16 Enveloping part 18 Housing recess 20 Outer fitting part 22 Annular convex portion 24 Enclosing concave portion 26 Contact surface portion

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[Procedure amendment]

[Submission date] August 24, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

FIG. 6

FIG. 7

[Figure 8]

[Figure 9]

Claims (1)

[Claims] 1. A composite pipe having an outer pipe made of concrete and an inner pipe made of synthetic resin, wherein a first engaging portion is formed on one end side end of the first outer pipe of the first composite pipe, and a second engaging pipe is formed. A second engaging portion that engages with the first engaging portion is formed at the other end side end of the second outer pipe of the composite pipe, and a first end is formed at the one end side end of the first inner pipe of the first composite pipe. A second fitting portion that fits the first fitting portion is formed at the other end side end portion of the second inner pipe of the second composite pipe while forming the fitting portion, and one end side end of the first composite pipe The first and second composite pipes when connecting the first and second composite pipes to each other and the other end side end of the second composite pipe.
It is characterized in that the engaging portion is engaged through the first sealing means and the first and second fitting portions of the first and second composite pipes are fitted through the second sealing means. Composite pipe joint structure.