JPH049958B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a corrugated pipe connection structure,
Specifically, the present invention relates to a corrugated pipe connection structure that can easily connect corrugated pipes such as drainage pipes and communication cable installation pipes underground.

(b) Prior Art As a connection structure for corrugated pipes, for example, the following pipe joints are used.

In other words, the pipe joint has a structure in which a rectangular body plate is bent into an arc shape and a connecting flange is formed on each axial edge, and the two pipe joints are butted together.
It is wrapped around both connecting parts of two corrugated pipes and connects the two corrugated pipes by fastening the flanges together using bolts and nuts.

Note that a sealing material (ring-shaped packing) is usually interposed between each corrugated pipe and the body plate to increase the degree of hermetic joint between both corrugated pipes.

(c) Problems to be Solved by the Invention However, in the conventional corrugated pipe joint structure described above, the contact area between the inner surface of the body plate and the surface of the corrugated pipe is small, so it is vulnerable to loads in the pulling direction that act on the corrugated pipe. There was a problem. In addition, there was a problem in that the sealing material for maintaining liquid tightness had to be carefully attached to the corrugated pipe on site, making the work time-consuming.

The present invention has been made in consideration of the above circumstances, and provides a corrugated pipe joining structure that allows corrugated pipes to be joined simply and reliably.

(d) Means for Solving the Problems This invention provides two corrugated pipes that are approximately cylindrical and have a spiral groove on their surfaces, and a member that is threaded onto the connecting end of these corrugated pipes. It consists of a bottom cylindrical member, has an opening on the bottom surface having a diameter substantially equal to the inner diameter of the corrugated pipe, and has a cylindrical member on the circumference of the body at a predetermined distance from the bottom surface in the axial direction of the cylindrical member. a cap body provided with at least two convex pieces that can be screwed together along the concave grooves of the corrugated pipe; The corrugated pipe concave groove, which forms a substantially hermetically sealed spiral path, is filled in liquid form, and is foamed and hardened after filling, thereby bonding the cap body and the corrugated pipe together, forming a single foamed resin layer. It consists of two or more divided cylindrical members forming a cylindrical body and having connecting flanges on both axial edges, and is wrapped around the surfaces of two cap bodies that are abutted against each other so that the bodies are flush, and the flanges are connected to each other. This is a corrugated pipe coupling structure consisting of a joint that connects two corrugated pipes by fastening them with a fastening means.

(E) Effect According to the present invention, a cap body made of a cylindrical member is screwed onto the joining side ends of two corrugated pipes, and a foamed resin is injected into the spiral path when the two corrugated pipes are screwed together. The body and the corrugated pipe are joined, and a cylindrical joint part that can be easily joined is formed at the joining side end of the corrugated pipe. The two corrugated pipes are easily and reliably connected by wrapping the joint around the cap body serving as the two butted cylindrical joints and fastening the flanges of the joint by means of the connecting means.

(f) Examples The present invention will be described in detail below based on examples shown in the figures. Note that the present invention is not limited thereby.

In Fig. 1, the corrugated pipe connection structure is 2
two corrugated pipes 1 and 2 and cap bodies 3 and 4
, foamed resin layers 5 and 6, and a joint 7. The corrugated pipe 1 has a substantially cylindrical shape and has a spiral groove (or a spiral convex ridge 9) on its surface.

As shown in FIGS. 2 to 5, the cap body 3 is
It is made of a bottomed cylindrical member that is screwed onto the connecting end of the corrugated pipe 1, and is made of a molded product made of synthetic resin. The cap body 3 is connected to a corrugated pipe 1 on the circumference of the body at a predetermined distance from the bottom surface 10 in the axial direction of the cap body 3.
Convex pieces 12 and 13 that can be screwed together along the groove 8 of
They are arranged facing each other. These convex pieces 1
2 and 13, when screwed into the corrugated pipe 1,
It is preferable to provide it on the circumference of the body of the cap body 3 beyond at least two convex protuberances 9, and the angle C determining the arc length of the convex pieces 12, 13 is 30° to 30°.
It is preferable to set it within a range of 40°. moreover,
When the cap body 3 is screwed onto the corrugated pipe 1,
As shown in FIG. 5, an injection hole 14 for injecting a polyurethane foam stock solution, which will be described later, is provided in the upper portion of the cap body 3. As shown in FIG.

FIG. 6 shows a state in which the above-mentioned cap body 3 is screwed onto the corrugated pipe 1.

Further, in FIG. 1, 5 is a hard polyurethane foam layer as a foamed resin layer, and injection holes 14
The polyurethane foam stock solution injected from the foam foams and fills the concave groove of the corrugated tube 1, which is the spiral path from the bottom surface 10 to the convex piece 12 when the cap body 3 is screwed onto the corrugated tube 1, and hardens. It is formed by The hardened polyurethane foam layer integrally connects the cap body 3 and the corrugated pipe 1 and improves the sealing performance between the inside of the corrugated pipe 1 and the outside of the corrugated pipe 1.

The structure of the cap body 4 that is attached to the corrugated pipe 2 and the hard polyurethane foam layer 6 that is filled into the groove of the corrugated pipe 2 is the same as that of the cap body 3 and the hard polyurethane foam layer 5 described above. Therefore, the explanation will be omitted.

The joint 7 forms one cylindrical body by being connected, and has connecting flanges 7a on both axial edges.
It is composed of two or more divided cylindrical members having two or more divided cylinder members, and is wrapped around the surfaces of two cap bodies 2 and 3 that are butted against each other so that the bodies are flush, and the flanges 7a are fastened together using bolts 15 and nuts 16. By this, the two corrugated pipes 1 and 2 are joined. This joint 7 can be constructed of a synthetic resin or metal pipe joint conventionally used for joining corrugated pipes, etc., and is connected to both cap bodies 3 and 4 via a sheet-like packing sheet 7b. It is wrapped around the waist.

Furthermore, as shown in FIG. 7, when injecting the polyurethane foam stock solution into the groove of the corrugated pipe 1, the opening of the cap body 3 is closed in order to prevent the foamed polyurethane foam from leaking outside the corrugated pipe 1. A bottomed cylindrical cover 17 that can penetrate and come into close contact with the inner wall of the corrugated pipe 1 is attached to the corrugated pipe 1.
It is preferable to press fit it into. Naturally, a release agent is applied to the cover 17. Moreover, this cover 17 is
By leaving it in place until the corrugated pipes are joined together, the inside of the corrugated pipes can be protected from dirt.

Next, the assembly procedure of this embodiment will be explained using FIG. A cap body 3 is screwed onto the connecting end of one of the corrugated pipes 1 and fixed, and a cover 17 is press-fitted onto the corrugated pipe 1 from the opening of the cap body 3 and fixed. Then the inlet 14
A polyurethane foam stock solution is injected into the foam, and the cap body 3 and the corrugated pipe 1 are bonded together by curing after foaming. Further, the cap body 4 and the corrugated pipe 2 are connected to the other corrugated pipe 2 by the same procedure as above. The above range is manufactured in advance at the factory.

Next, these two corrugated pipes 1 and 2 equipped with cap bodies 3 and 4 are transported to the construction site, and
Perform the following joining operations. That is, the bodies of the caps 3 and 4 are butted against each other so that they are flush with each other, the joint 7 is wrapped around the butted surfaces of the caps 3 and 4, and the flanges 7a of the joint 7 are connected with the bolts 1.
5 and nuts 16. This allows the corrugated pipes 1 and 2 to be easily connected.

In this embodiment, the number of protrusions is set to two, but the number of protrusions may be two or more in order to ensure smooth screwing.

FIG. 8 is a perspective view showing the appearance of the corrugated pipe coupling structure in this embodiment.

(G) Effects of the Invention According to the present invention, the connecting end of the corrugated pipe is formed into a cylindrical shape that is easy to connect with no unevenness by screwing the cap bodies together, and the two cap bodies that are butted together can be easily connected. By wrapping the joint around the body and fastening the flanges of the joint using a fastening means, two corrugated pipes can be conveniently and reliably connected.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram with a partially cutaway cross section showing a corrugated pipe coupling structure in an embodiment of the present invention, Fig. 2 is a left side view of the embodiment, and Fig. 3 is also a partially cutaway diagram. 4 is a right side view, FIG. 5 is a plan view, FIG. 6 is an explanatory view showing the cap body screwed onto the corrugated pipe in the embodiment, and FIG. 7 is a right side view. FIG. 6 is a side sectional view showing a state in which the cover is attached to the cap body, and FIG. 8 is a perspective view showing the external appearance of the embodiment. 1, 2... Corrugated pipe, 3, 4... Cap body, 5, 6... Foamed resin layer, 7... Joint, 8...
Concave groove, 12, 13... Convex piece, 15, 16... Fastening means.

Claims (1)

[Scope of Claims] 1. Consisting of two substantially cylindrical corrugated pipes having a spiral groove on their surfaces, and a bottomed cylindrical member screwed into the connecting end of these corrugated pipes, respectively. , the cylindrical member has an opening having a diameter substantially equal to the inner diameter of the corrugated pipe on the bottom surface, and the cylindrical member is connected to the concave groove of the corrugated pipe on the circumference of the body at a predetermined distance from the bottom surface in the axial direction of the cylindrical member. At least two convex pieces that can be screwed together along the
a plurality of cap bodies disposed therein, and a corrugated pipe concave groove serving as a substantially sealed spiral path extending from the bottom surface to the convex piece when the cap body is screwed to the corrugated pipe in liquid form; A foamed resin layer that fixes the cap body and the corrugated pipe together by foaming and hardening after filling, and 2 which forms a single cylindrical body by being connected and has flanges for connection on both axial edges. Consisting of the above split cylindrical members, the body is wrapped around the surfaces of two cap bodies that are butted against each other so that the body parts are flush with each other,
A corrugated pipe coupling structure comprising a joint for coupling two corrugated pipes by fastening the flanges together using a fastening means.