JPH0429916B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention provides a joint that can reliably and firmly connect composite pipes that have a two-layer structure in which the outer pipe is a corrugated pipe and the inner pipe is a straight pipe. Regarding.

(Conventional technology and its problems) As a sewer pipe buried underground, for example,
As shown in the cross-sectional view in the figure, a drain pipe A' has been proposed, which is made of a straight pipe with constant inner and outer diameters and provided with hollow protrusions on the outer wall to provide rigidity.

However, when connecting these drain pipes A', the following problems occurred. That is, as shown in the same figure, when forming the enlarged diameter socket 11' by press-fitting an inner mold into the end of one drain pipe A', it is difficult to expand the socket because the convex stripes on the outer surface become an obstacle. There was a problem in that diameter forming could not be carried out smoothly and the inner surface of the socket was not smooth because dents were formed in the portions corresponding to the holes H of the protrusions. Also, the other drain pipe is connected to the socket 11'.
When connecting the end 12' of A', the socket 1
The protrusions on the end portion 12' must be removed over a length L corresponding to the length of the end portion 1', and this cutting operation is troublesome and time-consuming.

The present invention solves this problem and provides a joint that can reliably and firmly connect two-layered composite pipes by inserting a straight pipe into a corrugated pipe.

(Means for Solving the Problems) The first invention of the present application is a composite pipe in which a straight pipe is inserted into a corrugated pipe with a constant wall thickness having spiral or annular uneven stripes, the composite pipe having The ends of each straight pipe are butted against each other, and the ends of each straight pipe are connected via a sleeve joint, and the outer peripheral side of the connection part is covered with the ends of the corrugated pipes that are butted against each other. It is characterized in that a locking member is engaged across both ends.

Further, a second invention of the present application is a composite tube in which a straight tube is inserted into a corrugated tube having a constant thickness and having spiral or annular uneven stripes, and the ends of the composite tube are butted against each other. The end of one straight pipe is inserted into the enlarged diameter socket provided at the end of the other straight pipe, and the outer circumferential side of the connected part is covered with the ends of corrugated pipes that abut each other. This is a characteristic feature.

(Function) When the composite pipes are butted together and their respective straight pipes are connected via sleeve joints, the straight pipes are firmly joined together, and both ends of the corrugated pipe that covers the outer circumference of this joint When the locking members are straddled and engaged, the corrugated tubes are firmly joined together.

Also, when the end of the other straight pipe is inserted into the enlarged diameter socket provided at the end of one straight pipe, the straight pipes are firmly connected to each other, and the outer corrugated pipe becomes the inner pipe. In order to protect the straight pipe, external forces such as earth pressure will not act directly on the straight pipe and its connections.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the first invention, in which FIG.
The figure is a sectional view showing another embodiment of the first invention, FIG. 3 is a partial sectional view showing an embodiment of the second invention, and FIG. 4 is a partial sectional view showing another embodiment of the second invention. be.

In the figure, reference numeral 1 denotes a straight tube with constant inner and outer diameters, and 2 denotes a corrugated tube with a constant wall thickness and a spiral or annular uneven stripe. The straight pipe 1 and the corrugated pipe 2 are made of metal such as aluminum or iron, or thermoplastic resin such as vinyl chloride resin or polyethylene, and the straight pipe 1 is inserted into the corrugated pipe 2 to form a composite. This is called tube A.

First, an embodiment of the first invention of the present application will be described based on FIG. In this embodiment, a composite tube A is obtained by inserting a straight tube 1 having an oval cross section into a corrugated tube 2 having an oval cross section.

The ends of the composite pipes A are butted against each other, and the ends of the respective straight pipes 1 are connected to each other via the sleeve joint 3a. Sockets are provided at both ends of the sleeve joint 3a, and the ends of the straight tube 1 are inserted into the respective sockets and bonded together. Therefore, the outer circumferential side of this connection part is covered with the ends of the corrugated tubes 2 that abut each other, and a half-shaped locking member 4a is placed over both ends of each corrugated tube 2, and the locking member 4a is Tighten and fix the flanges provided on the edges with bolts and nuts.

In the case of this embodiment, there is no need to perform any special processing on the composite pipe A, and it is only necessary to prepare the sleeve joint 3a and locking member 4a according to the pipe diameter, so the connection operation is extremely simple and You can definitely do it.

Further, as shown in the drawing, through holes 13 and 14 are provided in the wall of the straight pipe 1 and through holes 23 and 2 are provided in the wall of the corrugated pipe 2.
4 at a predetermined pitch P, this composite pipe A can be used as a drainage pipe for allowing rainwater etc. to permeate underground or for discharging groundwater etc. generated in soft ground.

The joint shown in FIG. 2 is constructed by providing enlarged-diameter sockets 11 at the ends of both straight pipes 1, inserting the sleeve joint 3b into the sockets 11 that abut against each other, and adhesively engaging them. The pipes 2 are connected to each other by a locking member 4b. That is, a rubber ring 41 is attached across both ends of the butted corrugated tubes 2, and the unevenness provided on the inner peripheral surface of the rubber ring 41 is engaged with the unevenness of the corrugated tube 2, and then the rubber ring 41 The outer circumferential surface of is tightened and fixed with a half member 42.

Next, an embodiment of the second invention will be described based on FIG. 3. In this joint, an enlarged-diameter socket 11 is provided at the end of one straight pipe 1 to be butt-connected, and the end 12 of the other straight pipe 2 is inserted into the socket 11 and joined by adhesive. The outer periphery of the connecting portion is covered with the ends of corrugated tubes 2 that abut against each other.
The outer surface of the socket 11 and the inner surface of the corrugated tube 2 may be joined with an adhesive.

FIG. 4 shows another embodiment, in which an enlarged diameter socket 11 having an annular groove at the end of one straight pipe 1 is shown.
and a rubber packing 1 attached to the annular groove.
The straight tube 1 inserted into the socket 11 through the socket 11 is connected in a telescopic manner.

(Effects of the Invention) As described above, the joint of the present invention connects composite pipes in which a straight pipe is inserted into a corrugated pipe, and connects the butted straight pipes to each other through a sleeve joint or Since the end of the other straight tube is inserted into the enlarged diameter socket provided at the end of one straight tube for connection, the straight tubes can be connected to each other reliably and firmly.

In addition, since the straight pipe and its connecting part are protected by a corrugated pipe, even if external forces such as earth pressure act on the corrugated pipe, the inner straight pipe will not be damaged or deformed into a flat shape. do not have.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the first invention, in which FIG. 3 is a partial sectional view showing another embodiment of the second invention; FIG. 4 is a partial sectional view showing another embodiment of the second invention; FIG. 5 is a sectional view showing a conventional example. 1... Straight pipe, 2... Corrugated pipe, 3... Sleeve, 4... Locking member.

Claims (1)

[Claims] 1. A composite tube in which a straight tube 1 is inserted into a corrugated tube 2 having a constant wall thickness and having spiral or annular uneven stripes, the ends of which are butted against each other. The ends of each straight pipe 1 are connected to each other via a sleeve joint 3, and the outer circumferential side of the connection part is covered with the ends of corrugated pipes 2 that abut each other, and both ends of each corrugated pipe are A composite pipe joint characterized in that a locking member 4 is engaged across the joint. 2 A composite pipe in which a straight pipe 1 is inserted into a corrugated pipe 2 with a constant wall thickness having spiral or annular uneven stripes, and the ends of the composite pipe are butted against each other to form one straight pipe. The end of the other straight pipe 1 is inserted into the enlarged diameter socket 11 provided at the end of the straight pipe 1, and the outer peripheral side of the connected part is covered with the ends of corrugated pipes that abut each other. Joints for composite pipes.