JPH078941Y2 - Vertical split tube with plastic wave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a split plastic corrugated pipe useful as a protective pipe for electric cables.

[Conventional technology]

Straight tube steel pipes and vinyl chloride pipes are mainly used as protective pipes for electric cables, but in recent years many corrugated plastic pipes have been used as suitable for their light weight and variety of pipes. It has become.

In some cases, the cable protection tube may be covered with the cable protection cable after it has been laid. In such a case, the following construction is performed.

(I) The pipe is split in the vertical direction, the split pipe is covered with the laying cable, the split ports are aligned, and then the adhesive tape is wound around the outside to fix the pipe integrally, (ii) the pipe wall is longitudinally It shall be split along the entire length, the split portion is expanded to accommodate the installed cable inside the pipe, and then the split portion is aligned, and the adhesive tape is wound around and fixed to the outside, (iii) above (ii) In the same manner, using a structure in which the pipe walls of the pipe splitting portion are detachable from each other, and the adhesive tape winding can be omitted. [Problems to be solved by the invention] Above (i) and (ii) In both methods, since it is necessary to perform an integrated construction by winding an adhesive tape on the outer side of the protective tube after inserting the cable, the workability is poor and the working time becomes extremely long.

On the other hand, the winding of the adhesive tape can be omitted (iii)
In the construction method described in (1), a special tool must be used for expanding the split portion of the pipe, and there were many problems in improving the workability.

[Means for solving problems]

Here, the inventors completed the present invention as a result of intensive studies to solve such a problem.

That is, the present invention relates to a corrugated plastic pipe in which a large number of corrugated portions are provided in the circumferential direction over the entire length in the longitudinal direction of the pipe, and one portion of the pipe wall is cut off along the entire length in the longitudinal direction of the pipe to form a split structure. Of the vertical splitting structure and the pipe wall at a portion spaced a desired distance from each other are formed into a flexible portion having a narrow width and a cross section orthogonal to the longitudinal direction of the pipe over the entire length in the longitudinal direction of the pipe. A plastic pipe with a splitting wave, characterized in that the pipe wall ends of the structure part are mutually detachable.

[Action]

In this invention, the tube itself has excellent flexibility, and the tube is formed by a flexible portion having a narrow width and a cross section orthogonal to the tube longitudinal direction provided over the entire length of the tube in the longitudinal direction. The spreadability of the split structure is remarkably improved, and the work of inserting the laying cable can be performed with almost no need for a separate tool.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the most preferable example of the present invention. In the figure, (1) is a corrugated plastic pipe, which has a narrow width at a part of its circumference along the entire length of the pipe in the longitudinal direction and has a narrow cross section orthogonal to the longitudinal direction of the pipe. A flexible structure (2) is provided, and the pipe wall of the other portion on the diametrically opposite side is split into pieces by alternately separating the pipe wall ends over the entire length in the pipe longitudinal direction by the detachable structure (3). is there.

The engagement / disengagement structure (3) is formed by engagement and disengagement recesses (4) and protrusions (5) at the ends of the respective pipe walls.

In the figure, (6) is a corrugated portion provided on the outer circumference of the pipe.

The corrugated plastic pipe (1) having such a structure opens the engaging / disengaging structure (3) in the longitudinal direction of the pipe as shown in FIG. The recess (4) and the protrusion (5) are engaged with each other to close the pipe and finish the construction.

The corrugated plastic pipe (1) can be easily opened and closed by a flexible portion (2) having a small width and a cross section orthogonal to the longitudinal direction of the pipe having a mountain-like or corrugated shape. Can be done quickly.

The positional relationship between the detachable structure part (3) and the flexible part (2) having a narrow width and a cross section orthogonal to the longitudinal direction of the pipe having a mountain shape or a corrugation is as shown in FIG. The opening width of the engagement / disengagement structure part (3) may be slightly smaller in this case, but the diameter of the cable (7) or the like does not hinder the construction.

The flexible portion (2) having a narrow width and a cross section orthogonal to the longitudinal direction of the pipe is not particularly specified, but for example, as shown in the drawing, the cross section orthogonal to the longitudinal direction of the pipe (1) is chevron-shaped. It is preferable to use a corrugated shape in order to increase the opening / closing property of the detachable structure part. Further, if the plate-like shape having a wave in the longitudinal direction is used, the degree of impairing the flexibility of the tube itself can be reduced.

Further, as shown in FIG. 3, if the flexible portion (3) having a narrow width and a cross section orthogonal to the longitudinal direction of the pipe is provided at two locations on the circumference of the pipe, the opening / closing property is further improved. Will be improved.

Further, the engagement structure of the disengageable structure part (3) may be modified in various manners, the detailed explanation of which is omitted, and the cross-sectional shape thereof is shown in FIGS.

[Effect of device]

As described in detail above, the present invention, in the corrugated plastic pipe as described above, has a small width over the entire length in the longitudinal direction of the pipe wall of the corrugated plastic pipe at a portion at a desired interval from the above-mentioned split structure portion. In addition, by forming a flexible portion having a mountain-shaped or corrugated cross section orthogonal to the longitudinal direction of the pipe, and by making the pipe wall ends of the above-mentioned split structure part capable of being engaged and disengaged with each other, a pipe for an existing electric wire cable can be obtained. When the cover is put on, it can be attached extremely quickly, and no adhesive tape winding is required, so that workability thereof can be remarkably improved.

[Brief description of drawings]

Fig. 1 is a perspective view of the plastic corrugated pipe of the present invention, Figs. 2a and 2b are several examples and cross-sectional views when each cable is accommodated, Fig. 3 is a cross-sectional view of another modified corrugated pipe, and Fig. 4 is the same. It is sectional drawing of the example of engagement of a tube vertical split part. 1 ... Wavy plastic pipe, 2, 10 ... Small width and thin flexible section,
3 ... Engagement / disengageable structure part, 4, 5 ... Engagement / disengagement uneven part at the end of the pipe wall
... corrugated part, 7 ... cable.

Claims (1)

[Scope of utility model registration request] 1. A corrugated plastic pipe having a corrugated structure in which a large number of corrugations are provided in the circumferential direction over the entire length in the longitudinal direction of the pipe, and one portion of the pipe wall is cut off along the entire length in the longitudinal direction of the pipe. Of the vertical splitting structure and the pipe wall at a portion spaced a desired distance from each other are formed into a flexible portion having a narrow width and a cross section orthogonal to the longitudinal direction of the pipe over the entire length in the longitudinal direction of the pipe. A plastic pipe with a vertical split, characterized in that the ends of the pipe wall of the structure are mutually detachable.