JPH06281069A - Connecting structure for ribbed pipe - Google Patents

Abstract

PURPOSE:To provide a connecting structure for a ribbed pipe, wherein any groove by which turbulent flow is generated in fluid is not formed on the inner surface of the connecting part. CONSTITUTION:A socket 1 provided with a taper part 11 on the innermost part is formed on the end of one ribbed pipe P, while an insertion port 2 wherein a ring-like packing 3 is attached between annular ribs (r) is formed on the end of the other ribbed pipe P. And, in the connecting structure of the ribbed pipe P wherein the socket 1 and the insertion port 2 are fitted to each other, an annular rib (r) positioned on the endmost part and a rib removed part 21 wherein the top end of the rib (r) positioned next thereto is cut are formed on the top end of the insertion port 2. This rib removed part 21 is inserted inside the taper part 11, of the socket 1, and a solid ring 4 is attached on the outer surface of this rib removed part 21, moreover the outer surface of the solid ring 4 is close attached to the part from the inner surface of the taper aprt 11 of the socket 1 to the just front part thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure in which ribbed tubes are connected to each other.

[0002]

2. Description of the Related Art In recent years, a ribbed pipe in which a large number of annular ribs are provided on the outer periphery of a pipe has been proposed and is being adopted as a pipe for underground embedding. By the way, when connecting the ribbed pipes to each other, at the end of one ribbed pipe, a receiving port having a diameter larger than that of the other part is formed, and at the other end of the ribbed pipe,
This is carried out by a method in which a ring-shaped packing is fitted between the annular ribs and the receptacles are fitted into the receptacles.

[0003]

However, in such a conventional connecting structure for ribbed pipes, since the annular rib of the outlet contacts the taper portion formed at the back of the receiving outlet, the outlet is closed. It can be inserted only before the tapered portion of the receiving port, and a groove having a triangular cross-section having a depth substantially equal to the thickness of the ribbed tube is formed between the tapered portion of the receiving port and the tip of the insertion port. Therefore, a turbulent flow is generated in the fluid flowing in the pipe, and there is a problem that when a fluid containing foreign matter such as sewage flows in a natural flow-down piping method, the foreign matter may be caught in the groove.

In Japanese Patent Laid-Open No. 53-10120, an example is shown in which a ring having a triangular cross section is attached to the receiving end of a normal synthetic resin pipe having no ribs along the tapered portion at the back. It is shown. That is, when the other synthetic resin pipe is inserted into the receiving port, the tapered portion of the receiving port and the tip of the receiving port are continuous with each other through the ring. Therefore, it is conceivable to apply this structure to a ribbed tube as it is. However, in the case of a ribbed tube, the height of the annular rib is several times or more the wall thickness of the tubular body, and therefore it can be inserted into the tapered portion of the receiving port. In order to fill the groove between the tip of the mouth with the ring, the cross-sectional area of the ring must be made considerably larger than in the case where it is used for ordinary synthetic resin pipes, and the material cost is high. Therefore, there is a problem that the cost becomes high.

In view of the above problems, the present invention provides a connection structure of a ribbed pipe in which a groove for causing turbulence in a fluid is not formed on the inner surface of the connection part at the lowest possible cost. It is an object.

[0006]

In order to achieve the above object, in the connection structure of the ribbed pipe of the present invention, a receiving port having a tapered portion is formed at the end of one ribbed pipe, and the other is formed. In the connection structure of the ribbed pipe in which ring-shaped packings are fitted between the annular ribs at the ends of the ribbed pipes, and these receiving ports are fitted to each other. At the tip of the mouth, at least a tip of the annular rib is cut off to form a rib removing portion, and the rib removing portion is inserted inside the tapered portion of the receiving opening.

[0007]

[Function] A ribbed tube having a tapered receiving portion at the end is formed at the end, and a ring-shaped packing is fitted between the annular ribs, and the tip of the opening is formed. When connecting with the ribbed tube in which the rib removal portion is formed, the receiving opening and the insertion opening are fitted so that the rib removal portion of the opening is inserted inside the tapered portion of the receiving opening.

Then, since the rib removing portion of the outlet is inserted inside the tapered portion of the receiving opening, a groove is formed between the tapered portion of the receiving opening and the tip of the opening so that a turbulent flow is generated in the fluid. Can hardly do.

[0009]

Embodiments of the present invention will be described in detail below with reference to the drawings. First, the connection structure of the ribbed pipe of the first embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a connection structure of a ribbed pipe of the present embodiment, and FIG. 2 is an enlarged view of a main portion II of FIG. 1, in which 1 is formed at one end of one ribbed pipe P. The receiving port 2 is a port formed at the end of the other ribbed pipe P, and the ribbed pipes P and P are connected by fitting the receiving port 1 and the port 2 together. .

The receiving port 1 is formed by softening one end of a ribbed pipe P provided with a large number of annular ribs r on the outer periphery of the pipe body p by heating and expanding the diameter in the softened state. A tapered portion 11 is formed at the back.

The outlet 2 has a ring-shaped packing 3 mounted between annular ribs r provided at one end of the ribbed pipe P. The packing 3 is closely attached to the inner surface of the receiving opening 1. ing. In addition, a rib removing portion 21 is formed at the tip of the spigot 2 by cutting the tip of the annular rib r positioned at the end and the tip of the annular rib r positioned next to it. The rib removing portion 21 is inserted inside the tapered portion 11 of the receiving port 1. Further, the solid ring 4 is attached to the outer surface of the rib removing portion 21, and the outer surface of the solid ring 4 is the taper portion 11 of the receiving port 1.
It is in close contact with the part from the inner surface to the front side.

In the rib removing portion 21, the tip of the annular rib r located at the end is cut off by about 2/3 of the whole,
The tip of the annular rib r located next to it is cut off by about 1/3 of the whole.

As shown in FIG. 3, the solid ring 4 is formed by combining two half members 41, and the outer surface of the rib removing portion 21 is not forced to deform the annular rib r. It can be attached to. Also,
Grooves 42 and 43 which are fitted to the annular rib r are formed on the inner surface of the both half-divided members 41, and when the insertion port 2 is inserted into the receiving port 1, the solid ring 4 is in the axial direction of the insertion port 2. It is designed so that it will not move.

Next, the operation of the first embodiment will be described.

When the ribbed pipe P having the receiving port 1 formed at the end thereof and the ribbed pipe P having the receiving port 2 formed at the end thereof are connected to each other, first, the ribs of the feeding port 2 are removed. Part 21
The solid ring 4 is attached to the outer surface of the socket 1. The rib removing portion 21 of the outlet 2 is received until the outer surface of the solid ring 4 comes into close contact with the portion from the inner surface of the tapered portion 11 of the receiving opening 1 to the front side thereof. It is inserted inside the taper portion 11 and the receiving opening 1 and the insertion opening 2 are fitted together.

Then, the tapered portion 11 of the receiving opening 1 and the tip of the insertion opening 2 are brought into close proximity to each other, and the portion between them is filled with the solid ring 4, so that the tapered portion 11 of the receiving opening 1 and the insertion opening 2 are formed. There is almost no groove between the tip of the and the turbulent flow of the fluid.

In other words, in the connection structure of this embodiment, the fluid flows smoothly without causing turbulence in the pipe, and the work for connecting the ribbed pipes P, P to each other is conventional. Similarly to the above, it is easy since it is sufficient to simply fit the receiving port 1 of the ribbed pipe P on one side and the outlet port 2 of the ribbed pipe P on the other side.

Further, since the solid ring 4 is mounted on the rib removing portion 21 of the spigot 2, the tip strength of the spigot 2 is increased, and it is possible to prevent the rib excluding portion 21 from being damaged by a load or an impact.

Next, the connection structure of the ribbed pipes of the second to fifth embodiments will be described. In describing these embodiments, only the configuration different from that of the first embodiment will be described, and the same configurations as those of the first embodiment will be designated by the same reference numerals in the drawings and will not be described.

First, the connecting structure of the ribbed pipe of the second embodiment will be described with reference to FIGS. In the connection structure of the present embodiment, the outer edge of the tip of the tubular body p is cut off at the tip of the spigot 2, and the rib removing portion 22 is formed by cutting off the tip of the annular rib r. Cut surface of p and annular rib r
The rib removing portion 22 is inserted into the inside of the tapered portion 11 of the receiving opening 1 until the cut surface of the above contacts the inner surface of the tapered portion 11 of the receiving opening 1. The rib removing portion 22 is cut at the same angle as the inner surface of the tapered portion 11 so that the entire cut surface is in close contact with the inner surface of the tapered portion 11 of the receiving port 1.

That is, in this embodiment, the tapered portion 11 of the receiving opening 1 and the insertion opening 2 are provided without interposing another member such as a ring.
Since the rib removing portion 22 is brought into contact with the groove to prevent the fluid from generating a turbulent flow groove, the fluid can be smoothly moved in the pipe without causing turbulent flow at a cost almost the same as the conventional one. Can be made to flow to.

Next, the connecting structure of the ribbed pipe of the third embodiment will be described with reference to FIGS. 6 and 7. The connection structure of this embodiment is different from the connection structure of the second embodiment in that a filling material 5 such as urethane foam is filled between the annular ribs r of the rib removing portion 22.

That is, in this embodiment, since no space is formed between the rib-removed portion 22 of the spigot 2 and the receiving opening 1, it is possible to secure higher water shutoff than the connection structure of the second embodiment. Further, as compared with the second embodiment, since the filling material 5 is filled between the annular ribs r, the tip strength of the spigot 2 is increased, so that the rib removing portion 22 is subjected to load or impact.
Can be prevented from being damaged. Furthermore, during manufacturing,
When the filling 5 such as urethane foam is filled between the annular ribs r and the outer angle of the tip of the tubular body p and the tip of the annular rib r are cut off, the impact at the time of cutting is absorbed by the filling 5. It is possible to prevent the pipe body p and the annular rib r from being cracked or chipped.

Next, the connection structure of the ribbed pipe of the fourth embodiment will be described with reference to FIGS. 8 and 9. In the connection structure of the present embodiment, a rib removing portion 23 in which the annular rib r located at the end is cut off from the root is formed at the tip of the spigot 2, and at the tip of the rib removing portion 23, A folded-back portion 24 that is folded back to the outside is formed, and the rib removing portion 23 is inserted inside the tapered portion 11 until the folded-back portion 24 contacts the inner surface of the tapered portion 11 of the receiving port 1. The folded-back portion 24 is formed by heating one end of the ribbed pipe P by heating and folding the ribbed pipe P in the softened state so that the entire folded-back portion 24 is in close contact with the inner surface of the tapered portion 11.
It is folded back at the same angle as the inner surface of the tapered portion 11.

In other words, in this embodiment, since the rib removing portion 23 is provided, the tip strength of the rib removing portion 23 is increased, so that the rib removing portion 23 is prevented from being damaged by a load or an impact. it can.

Next, the connection structure of the ribbed pipe of the fifth embodiment will be described with reference to FIGS. The connection structure of the present embodiment is the same as the connection structure of the fourth embodiment except for the rib removing portion 2
3 and the folded portion 24, a solid ring 6 having a triangular cross section.
Is installed.

In other words, in this embodiment, the solid ring 6 further increases the bending rigidity of the rib removing portion 23, so that the rib removing portion 23 can be prevented from being damaged by a load from above. Further, during manufacturing, one end of the ribbed pipe P is softened by heating, and then the solid ring 6 is attached to the outer surface of the rib removing portion 23.
By folding back the tip of the pipe body p along the outer surface of, the folded portion 24 can be formed at an optimal folding angle, and the waterproofness is also improved.

Instead of the solid ring 6, the same filling material as in the third embodiment may be filled.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention. For example, in the embodiment, the number of the annular ribs to be cut off to form the rib removed portion is one or two, but the number of the annular ribs to be cut is the same as that of the taper portion provided in the receiving port. It is preferably determined according to the length and the like.

[0030]

As described above, in the ribbed pipe connection structure of the present invention, since there is almost no groove between the tapered portion of the receiving port and the tip of the insertion port, the fluid causes a turbulent flow. Will flow smoothly without any. In addition, the work of connecting the ribbed pipes on site can be achieved by simply fitting the receiving port and the insertion port as in the conventional case.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connection structure of a ribbed pipe according to a first embodiment.

FIG. 2 is a sectional view showing a main part II of FIG.

FIG. 3 is a perspective view showing a solid ring.

FIG. 4 is a cross-sectional view showing a connection structure of a ribbed pipe according to a second embodiment.

5 is a cross-sectional view showing a main part V of FIG.

FIG. 6 is a cross-sectional view showing a connection structure of a ribbed pipe according to a third embodiment.

7 is a cross-sectional view showing a main part VII of FIG.

FIG. 8 is a cross-sectional view showing a connection structure of a ribbed pipe according to a fourth embodiment.

9 is a cross-sectional view showing a main part IX of FIG.

FIG. 10 is a cross-sectional view showing a connection structure of a ribbed pipe according to a fifth embodiment.

11 is a sectional view showing a main part XI of FIG.

[Explanation of symbols]

 P Rib pipe p Tubular body r Annular rib 1 Receiving port 11 Taper part 2 Insert port 21, 22, 23 Rib removing part 3 Packing

Claims (1)

[Claims] 1. A receiving port having a tapered portion is formed at the end of one ribbed pipe, and the other ribbed pipe is provided at the other end.
In the connection structure of the ribbed tube in which the ring-shaped packing is mounted between the annular ribs, and the receiving port and the port are fitted, at the tip of the port,
A connecting structure for a pipe with ribs, wherein a rib removing portion is formed by cutting at least a tip of an annular rib, and the rib removing portion is inserted inside a tapered portion of the receiving port. A connecting structure for a pipe with ribs, wherein a rib bending portion formed by bending an annular rib is formed at a tip end portion of the insertion opening, and the rib bending portion is inserted inside a tapered portion of the receiving opening.