JPH10227377A - Cable-laying pipe and its connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of weight and a material cost caused by equalized thickness of a conventional cable laying pipe having even thickness irrespective of partial embedment of a sheath pipe and troublesome accurate alignment of the embedded sheath pipes for connecting the cable laying pipes. SOLUTION: In a cable-laying pipe 1, a cable inserting sheath pipe 4 is embedded in an outer peripheral wall 2. Thickness of a part 3a in which the sheath pipe 4 is embedded exceeds the thickness of other parts 3b. The sheath pipe 4 is shorter than the cable laying pipe 1. Holes 6 communicated with end faces of the sheath pipe 4 are formed on end faces 1a, 1b of the sheath pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying pipe capable of laying a cable such as an electric wire, a wire, an optical fiber or the like in an outer peripheral wall of a pipe such as a water supply and sewage pipe, and particularly without reducing the strength of the pipe. The present invention relates to a cable laying pipe capable of reducing the weight of the entire pipe and facilitating the handling of the pipe, and a connection structure of the pipe.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional cable laying pipe of this kind is formed of a cable laying pipe 51 made of a fume pipe having a uniform overall thickness. A plurality of sheath pipes 53 for cable insertion are embedded.

[0003]

However, in the above-mentioned conventional cable laying pipe 51, since the sheath pipe 53 is buried, the outer peripheral wall 52 is formed so as to have a large wall thickness as a whole. The overall weight of the service pipe 51 becomes extremely heavy, and the number of concrete materials used increases. Further, when connecting a plurality of cable laying pipes 51 in succession, it is difficult to accurately align and connect the end faces of the sheath pipes 53 embedded in each cable laying pipe 51 to each other. There was a problem.

The cable laying pipe and the connecting structure of the pipe according to the present invention are a completely new technique developed in view of the above-mentioned conventional problems, and particularly, a hollow pipe having only a portion in which a sheath pipe is embedded. Technology for cable laying pipes having a structure in which the pipe thickness of the pipe is made larger than the pipe thickness of the other parts, and the pipe thickness of the entire circumference at both ends is made large and uniform, and the outer peripheral surface is formed in a circular shape, and the connecting structure of the pipes Is provided.

[0005]

SUMMARY OF THE INVENTION A cable laying pipe according to the present invention is a technique for fundamentally improving the above-mentioned conventional problems, and the gist of the first invention is that a cable insertion pipe is inserted into an outer peripheral wall. In the hollow pipe in which the sheath pipe is embedded, the thickness of the portion in which the sheath pipe is embedded is made larger than the thickness of the other portion, and the thickness of the entire circumference of both ends of the hollow pipe is reduced. A cable laying pipe characterized in that an outer peripheral surface is made circular by making the pipe thickness equal to a pipe thickness of a portion where the sheath pipe is buried.

The gist of the second invention of the cable laying pipe according to the present invention is that the both end faces of the sheath pipe embedded in the outer peripheral wall of the hollow pipe are located inside the end face of the hollow pipe. The cable laying pipe according to the first aspect of the present invention, wherein a hole for fitting a pipe joint material is provided in a lever portion.

Further, the gist of the first invention of the connection structure of a cable laying pipe according to the present invention is that the cable laying pipe is provided with a hole for fitting a pipe joint material at an end of the hollow pipe. In the connection structure for connecting the pipes, the pipe joint material is connected by fitting both sides of the pipe joint material into the holes for fitting the pipe joint material of the adjacent cable laying pipe. Structure.

The gist of the second invention of the cable laying pipe and the connecting structure of the pipe is that both ends of the pipe joint material have a chamfered shape.
It is a connection structure of the cable laying pipe of the invention.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cable laying pipe according to the present invention. FIG. 1 is a perspective view of the cable laying pipe according to the present invention. 2 is a partially sectional explanatory view showing a connection state of the cable laying tube of FIG. 1, and FIGS. 3A and 3B are enlarged sectional explanatory views of a main part of the cable laying tube of FIG. 2.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a hollow cable laying tube according to the present invention, which is formed by a fume tube having a hollow hole 2 in a central portion formed by centrifugal molding using concrete. I have. Four sheath pipes 4 are buried in the outer peripheral wall 3 of the cable laying pipe 1 in parallel with the axial direction at substantially equal intervals. This sheath pipe 4
Has a predetermined inner diameter through which an optical fiber cable (not shown) or the like can be inserted.

The tube thickness of the outer peripheral wall 3 of the portion 3a in which the sheath pipe 4 is embedded is formed to be larger than the tube thickness of the other portion 3b. The pipe thickness of the portion 3b having a small pipe thickness is substantially equal to the thickness of a normal fume pipe used only for general water and sewage pipes, and the portion 3b having a small pipe thickness is sufficient. It has a high external pressure strength.

The thickness of the entire circumference of both ends 5 of the cable laying pipe 1 is equal to the thickness of the thick section 3a in which the sheath pipe 4 is embedded as described above. Therefore, the outer peripheral surface is formed in a circular shape.

As described above, the length of the sheath pipe 4 buried in the outer peripheral wall 3 of the cable laying tube 1 is shorter than the length of the cable laying tube 1 and, in particular, FIGS. 3 (A) and 3 (B).
As shown in FIG.
4b are buried so as to be located inside the end surfaces 1a and 1b of the cable laying pipe 1, respectively. Accordingly, holes 6 having an inner diameter equal to the outer diameter of the sheath pipe 4 are formed at positions continuous with the buried sheath pipe 4 in both ends of the cable laying pipe 1.

3 (A) and 3 (B), reference numeral 7 denotes a pipe joint material which has the same outer diameter and inner diameter as the sheath pipe 4 and is provided at both ends of the cable laying pipe 1. It has a length slightly shorter than twice the depth of the hole 6 formed. This pipe joint material 7 is used when matching the positions of the sheath pipes 4 embedded in the cable laying pipes 1 when connecting a plurality of cable laying pipes 1 to each other. .

When the pipe joint member 7 is used, both ends of the pipe joint member 7 are fitted into holes 6 formed in the end surfaces 1a and 1b of the cable laying pipe 1 so as to be adjacent to each other. The position of the sheath pipe 4 embedded in the cable laying pipe 1 can be accurately matched.

The pipe joint member 7 is particularly shown in FIG.
As clearly shown in (A), the inner and outer peripheral edges at both ends are chamfered to have a chamfered shape. Therefore, when the pipe joint member 7 is inserted into the hole 6 of the cable laying pipe 1, it can be inserted smoothly with little insertion resistance. Further, even when the cable is inserted through the pipe joint member 7, the cable can be prevented from being damaged at the edge of the end face.

As shown in the figure, the inner peripheral edge of the end of the sheath pipe 4 can be chamfered to form a chamfered shape. In this case, it is possible to prevent the cable inserted into the sheath pipe 4 from being damaged by the edge of the end face.

In the figure, reference numeral 8 denotes a collar, one side of which is a ring groove 9 on the outer peripheral surface of the end of one cable laying tube 1.
a, 9b and the like, and the collar 8
A water-stop ring 10 is fixed to the inner peripheral surface of the other side portion, and this water-stop ring 10 is closely contacted with the outer peripheral surface of the end portion 5 of the other cable laying tube 1. This prevents groundwater and the like from invading the connection section of No. 1.

[0019]

Since the cable laying pipe according to the present invention has the above-described structure and operation, it has the following great effects.

(1) Since the tube thickness of the other portion is made smaller than the tube thickness of the portion in which the sheath pipe is buried, the whole constituent material can be reduced and the weight can be reduced. (2) Since the outer peripheral surface is made circular by making the thickness of the entire circumference of both ends equal to the thickness of the pipe in which the sheath pipe is buried, it can be rolled and moved during transportation. (3) It can be easily connected by using a collar having a simple shape having a waterproof property.

(4) When the both end surfaces of the sheath pipe buried in the outer peripheral wall are located inside the end surface of the cable laying tube, and the hole for inserting the partial pipe joint material is provided, By fitting the pipe joint material into the pipes, it is possible to accurately and easily match the positions of the sheath pipes buried in the cable laying pipes to be connected, and to connect them. (5) Further, the connection of the continuous cable laying pipes can be more firmly stabilized by being connected via the pipe joint material.

(6) Further, when the end of the pipe joint material is chamfered, the pipe joint material can be smoothly fitted into the hole on the end face of the cable laying pipe. (7) Further, by applying the chamfered shape to the end of the pipe joint material in this manner, it is possible to prevent the cable inserted through the pipe joint material from being damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cable laying pipe according to the present invention.

FIG. 2 is a partially sectional explanatory view showing a connection state of the cable laying pipe of FIG. 1;

FIGS. 3A and 3B are enlarged explanatory sectional views of the cable laying pipe of FIG.

FIG. 4 is an explanatory perspective view showing a conventional cable laying pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cable laying pipe 1a, 1b end face 2 Hollow hole 3 Outer peripheral wall 3a Large pipe thickness part 3b Small pipe thickness part 4 Sheath pipe 4a, 4b End face 5 End part 6 Hole 7 Pipe joint material 8 Collar 9a, 9b Ring concave Groove 10 Water stop ring 51 Cable laying pipe 52 Outer wall 53 Sheath pipe

Claims (4)

[Claims] In a hollow pipe having a sheath pipe for cable insertion embedded in an outer peripheral wall, a thickness of a portion where the sheath pipe is embedded is larger than a thickness of another portion of the hollow pipe. A cable laying pipe characterized in that the thickness of the entire circumference of both ends of the hollow pipe is equal to the thickness of the portion in which the sheath pipe is embedded, and the outer peripheral surface is circular. 2. An end wall of a sheath pipe buried in an outer peripheral wall of the hollow tube is located inside an end surface of the hollow tube, and a hole for fitting a pipe joint material is provided in this portion. The cable laying pipe according to claim 1, wherein: 3. A connecting structure for interconnecting said cable laying pipes, each of which has a hole for fitting a pipe joint material at an end of the hollow pipe, wherein both sides of the pipe joint material are connected to each other. A connection structure for a cable laying pipe, wherein the cable laying pipe is connected by being fitted into a hole for fitting a pipe joint material of an adjacent cable laying pipe. 4. A connecting structure for a cable laying pipe according to claim 3, wherein both ends of said pipe joint material have a chamfered shape.