JP2656431B2 - Polyethylene sleeve for ductile pipe and its coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyethylene sleeve for a ductile pipe and a method for covering the same.

[0002]

2. Description of the Related Art Conventionally, a polyethylene sleeve construction method is known in which ductile pipes are buried underground in order to protect the ductile pipes from being corroded by soil. When carrying out the polyethylene sleeve method, a ductile pipe covered in advance with a polyethylene sleeve and raised so that the polyethylene sleeve does not interfere with the existing ductile pipe is connected to the polyethylene sleeve. It is stretched along the outside of the pipe, covering the outer surface of the receiving port of the existing pipe, and carefully bending it to eliminate the gap with the outer surface.

[0003]

However, when the above-mentioned method is implemented, the final fastening of the polyethylene sleeve must be carried out by an operator entering a buried groove in which the ductile pipe is laid. It is very troublesome to repeat such an operation for each of the infinite number of pipe joints following the above, and in the case of a large-diameter ductile pipe, there is a drawback that the burial groove becomes deeper, which involves danger. In addition, since the fastening operation requires that a fastening member, for example, an elastic band or a fastening cord be looped around the outer periphery of the tube, it is necessary to hollowly support the ductile tube for a certain period of time, and the fastening operation itself has a disadvantage that the fastening operation itself is considerably troublesome. .

[0004]

According to the present invention, in order to solve the above-mentioned problems, when a polyethylene sleeve method is carried out, the fastening operation of the fastening member can be omitted, and the covering operation can be performed from outside the excavation groove by a robot or the like. The present invention has been made for the purpose of providing a polyethylene sleeve for a ductile pipe which can be automatically coated by the above method and a coating method thereof.

[0005]

That is, a polyethylene sleeve 1 for a ductile tube according to the present invention is provided at an end of a polyethylene sleeve 1A having an inner diameter capable of covering the ductile tube D with a sufficient margin. And a telescopic sleeve 1C having an inner diameter smaller than the outer diameter of the receiving port, which is capable of elastically tightening, is integrally provided.

Another invention relates to a method for coating a ductile pipe polyethylene sleeve using the ductile pipe polyethylene sleeve 1. The ductile pipe D is formed by inserting a diameter expanding device 3 into a stretchable sleeve 1C of the polyethylene sleeve 1. After expanding to an inner diameter larger than the outer diameter of the receiving port D1, the polyethylene sleeve 1 is covered on the ductile pipe D laid thereon, and the expansion and contraction sleeve 1C is folded back toward the duct center of the ductile pipe to remove the diameter expanding device 3. The folded elastic sleeve portion is folded back again so as to cover the outer surface of the ductile tube socket D1.

[0007]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is an explanatory view of the same, and FIGS. 3 to 5 are explanatory views showing steps of a method of the present invention.

[0008] The polyethylene sleeve 1 for a ductile pipe according to the present invention has an end 1B of a polyethylene sleeve 1A having an inner diameter capable of covering the ductile pipe D with a sufficient margin.
The ductile tube D (see FIG. 2; the same applies hereinafter) is integrally provided with a telescopic sleeve 1C having an inner diameter smaller than the outer diameter of the receiving port D1 and capable of elastically fastening the outer surface of the receiving port D1. The elastic sleeve 1C is made of a synthetic rubber material having excellent weather resistance, and is as thin as possible. The elastic sleeve 1C is a polyethylene sleeve 1C at the stage of manufacturing.
A and is integrally provided at one end or both ends of the polyethylene sleeve 1A.

In order to cover the ductile tube D with the polyethylene sleeve 1, as shown in FIG. 3 and subsequent drawings, a diameter expanding device 3, for example, a cylinder having a split as shown in the drawing, is provided at the elastic sleeve 1C portion of the polyethylene sleeve 1. Diameter expanding device 3 in which telescopic links 3B and 3B are connected to a split portion of body 3A.
Is inserted, and the telescopic links 3B and 3B are extended and expanded until the inner diameter becomes larger than the outer diameter of the receiving port D1 of the ductile tube D.
As shown in FIG. 4, the ductile tube D on which the polyethylene sleeve 1 is laid is covered, and the expansion and contraction sleeve 1C is folded back toward the center of the ductile tube D as shown by a dotted line to remove the diameter expanding device 3, and then shown in FIG. Sleeve 1 inserted into the socket D1 and inserted into the socket D1 as shown in FIG.
C is folded back again so as to cover the ductile tube receptacle D1 and the outer surface of the insertion port D2.

For this folding, for example, a guide tape 4 having an engaging portion 4A at its tip is prepared, attached to the telescopic sleeve 1C in advance, and the pulling direction of the guide tape 4 is pulled from the outside of the excavation groove. Remote control can be performed by controlling.

In the above embodiment, the elastic sleeve 1
Although the case where C is provided at one end of the polyethylene sleeve is shown, when it is provided at both ends, as shown in FIG. 6, the elastic sleeve 1C on the insertion port D2 side is also folded back in the same manner,
As shown in FIG. 7, after inserting the insertion port D2 into the reception port D1, the insertion tape D2 side is put on the outer surface of the reception port D1 by remote operation of the guide tape 4, and then the reception port D1 side is put on the insertion port D2 side to form a double. Cover.

[0012]

In the polyethylene sleeve for ductile tubes of the present invention, the elastic sleeve 1C is integrally provided at the end thereof.
Is tightened by the expansion and contraction force on the outer periphery of the ductile tube, so that reliable waterproofing can be achieved without tightening with a fastening member. Further, in the method for coating the polyethylene sleeve for the ductile pipe of the present invention, since the operation of the diameter expanding device 3 follows a certain order, it is possible to perform the operation by remote control of an automated robot, including the return operation to the original position. It is.

[0013]

Since the present invention is configured as described above, when the polyethylene sleeve method is carried out, the fastening work performed for each pipe port is not required at all, and labor can be saved. In addition, since the operation of coating the sleeve with the tube can be performed by a robot, there is an excellent effect that remarkable labor saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention.

FIG. 3 is an explanatory view showing the steps of the method of the present invention.

FIG. 4 is an explanatory view showing the steps of the method of the present invention.

FIG. 5 is an explanatory view showing the steps of the method of the present invention.

FIG. 6 is an explanatory view showing another step of the method of the present invention.

FIG. 7 is an explanatory view showing another step of the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyethylene sleeve for ductile pipe D Ductile pipe 1A Polyethylene sleeve 1B End 1C Telescopic sleeve D1 Receptacle D2 Insertion opening 3 Expansion device 4 Guide tape

Claims (2)

(57) [Claims] 1. An end portion of a polyethylene sleeve 1A having an inner diameter capable of covering the ductile tube D with a sufficient margin, and having an inner diameter smaller than the outer diameter of the receiving hole D1 capable of elastically fastening the outer surface of the receiving port D1 of the ductile tube D. Telescopic sleeve 1
A polyethylene sleeve for a ductile pipe, wherein C is integrally provided. 2. An end portion of a polyethylene sleeve 1A having an inner diameter capable of covering the ductile tube D with a sufficient margin has an inner diameter smaller than the outer diameter of the receiving port D1 capable of elastically fastening an outer surface of a receiving port D1 of the ductile pipe D. Telescopic sleeve 1
After inserting the diameter expanding device 3 into the elastic sleeve 1C portion of the ductile tube polyethylene sleeve 1 integrally provided with C and expanding it to an inner diameter larger than the outer diameter of the receiving port D1 of the ductile tube, the polyethylene sleeve 1 is removed. Cover the laid ductile tube D, fold the expandable sleeve 1C toward the center of the ductile tube D, remove the diameter expansion device 3, and then again cover the folded elastic sleeve 1C to cover the outer surface of the ductile tube D receptacle D1. And covering the polyethylene sleeve for a ductile pipe.