JPS6343514A - Conduit branching joint - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a conduit branching joint for branching conduits for laying communication cables and the like.

(Prior art and problems to be solved by the invention) Recently, as the diameter of communication cables has become smaller, it has become possible to install two or more communication cables in one underground conduit.
When demand occurs, additional communication cables are installed on the existing pipeline, and the communication cable is branched at a point adjacent to the demand point, that is, the pipeline is branched as shown in Figure 8. , if a building Bl or Bx is newly constructed between the manhole and the shield, or if the building Bl is relatively close to the existing manhole Branch the communication cable 5 inside 3 into the manhole, lay it in the conduit 3', and connect it to Building B!
branch to. In addition, in the case of building Ih newly constructed between manholes M1 and h, pipe line 3 is cut at the branch point,
A new handhole (sometimes a manhole) H is installed, and the communication cable 5 installed in the conduit 3 is branched off to building B! Methods such as branching out were taken. This means that in the past, there was no suitable pipe branching joint, and the communication cable was exposed at the branch point, so to protect the communication cable from ground pressure (such as from automobiles), it was necessary to branch it in a manhole or handhole. There was a need.

Such conventional branching of communication cables has disadvantages, such as the need to secure space for constructing a new manhole or handhole, construction costs, construction time, and lack of land.

(Objective of the Invention) An object of the present invention is to provide a pipe branching joint that is economical and quick to respond in order to solve the above-mentioned problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a branch pipe whose overall shape is a figure 7 shape and a main line side pipe divided into two, and a pipe end of the branch pipe and an existing pipe. The gist of this is that it consists of a split socket divided into two parts for connecting and fixing the pipe and the branch pipe.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to drawings showing examples. It should be noted that the embodiments are merely illustrative, and it goes without saying that various changes and improvements can be made without departing from the spirit of the present invention.

FIG. 1 is a diagram for explaining the gist of an embodiment of the present invention. In the figure, reference numeral 1 denotes a branch pipe having a 7-shaped overall shape, and the main line side pipe is divided into a branch line side branch pipe 1b and a dividing piece 1c along a vertical dividing line 1aK.

In addition, 2 is vertically divided into two by a split socket.

Figure 1 shows the existing pipe line 3 cut between points A and B, and the branch pipe 1
￥: Install between A and 8, and connect the pipe end of the branch pipe and the existing pipe line 3 and branch pipe line 3' with the split socket 2.
This figure shows the state where the connection is fixed.

First, the construction procedure VC using the pipe branching joint of the present invention will be described, and the details of the branch pipe and split socket will be described later.

FIG. 2 is a diagram illustrating the construction procedure of the pipe branching joint. In Figure 2 (a), the existing pipe 3 is dug out near the building where new demand has occurred, the pipe 3 is cut at points A and B, and the pipe 3a is vertically split. Road 3
Remove a. The length between A and 8 is the divided piece 1c of the branch pipe 1.
The length should be approximately equal to .

FIG. 2 (b) shows the state in which the FD conduit 3a is removed and the communication cable 4 is exposed. Next, as shown in FIG. 2(c), the branch pipe 1b on the branch line side is inserted into the part from which the pipe box has been removed. Furthermore, as shown in Fig. 2), the branch line side branch pipe 1b and the divided piece 1° are aligned,
Attach and fix the lower cover 2a and upper cover 2b of the split socket 2 to the points. The branch pipe 1b on the branch line side, the lower lid 2a of the split piece 1, the upper M 2 b, the split socket 2, the pipe line 3, and the branch pipe 1 are each adhered and sealed with an adhesive. After completing the connection between branch pipe 1 and pipe 3, as shown in Fig. 2)
A communication cable for new demand will be brought in and laid in the direction of arrow C shown in .

Next, the branch pipe and split socket will be explained.

FIG. 3 is a perspective view of the branch pipe, in which the main line side pipe of the branch pipe 1 is divided into a branch line side branch pipe 1b and a dividing piece 1c along a vertical division line 1a. Further, the branch line side branch pipe 1b shown in the figure is bent with a radius R of curvature. This radius R is the allowable curvature for bending the communication cable, and is the radius R of the branch pipe 1.
The pipe is bent at a predetermined curvature depending on the diameter of the pipe 3.

4(A), 4(B) and 4(C) are views showing one embodiment of the split socket, in which FIG. 4(A) is a perspective view, FIG. 4(B) is a side view and FIG. ) is a partial cross-sectional view. The split socket 2 does not have a complicated shape as shown in the figure, and a pipe simply divided into two parts may be sufficient for practical purposes.

The split socket 2 consists of a lower cover 2a and an upper cover 2b.
a and upper M2 b have the same shape. To explain the lower lid 2a, it has the shape of a cylinder divided into two parts, and has flanges 2c and 2d, and the flanges 2c are provided with a protruding strip 2' having a mushroom-shaped cross section. The collar 2d is also provided with a groove 2'd having a mushroom-shaped cross section. Lower M2a having such a shape
The upper cover 2b and the upper cover 2b are strongly fixed by fitting the protrusions 2'c and the grooves 2'd. The lower M2a and the upper M2b are fitted by abutting them from their sides and sliding the convex line 2'c into the concave line 2'd. Further, the inner diameter of the split socket 2 is approximately equal to the outer diameter of the conduit to be connected, but the inner diameters a and b of the lower M2g and the upper cover 2b are tapered in the axial direction. That is, a==lr+α, b=”r−β (where r is the outer diameter of the connecting pipe, α and β are the taper portions, and β>α
) is the preferred value. By providing a taper, when the lower cover 2a and the upper cover 2b are fitted together, the adhesion to the conduit 3 and the branch pipe 1 is improved.

In addition, recesses 2e provided at the ends of the lower lid 2a and the upper lid 2b.
is for inserting the reinforcing plate 6. The reinforcing plate 6 will be explained using FIGS. 5 and 6. After attaching the branch pipe 1 to the pipe line 3 and tightening it with the split socket 2,
A reinforcing plate 6 is applied so as to cover the vertical dividing line 1a, and the end of the reinforcing plate 6 is inserted into the recess 2e as shown by the arrow, and fixed using an adhesive. When the reinforcing plate 6 is used, watertightness and strength can be further increased.

Furthermore, a case where the existing pipe line and the branch pipe line are pipes with different diameters will be described. If the branch pipe line (not shown) is narrower than the existing pipe line 3, connect the socket 7 with a different diameter as shown in the figure to match the branch pipe line with the thinner one.

The different diameter socket 7 has a tip 7 from the inner diameter and outer diameter of the base end 7a.
It has a shape in which the inner and outer diameters of b are narrower. As a result, by vertically connecting sockets of different diameters up to the required thickness, it is possible to make the inner diameter and outer diameter the same as that of a predetermined branch pipe.

(Effects of the Invention) As explained above, according to the present invention, there is provided a branch pipe having a Y-shape as a whole and a main line side pipe divided into two, a pipe end of the branch pipe, an existing pipe, and a branch pipe. By comprising a split socket divided into two for connecting and fixing the two, the following effects are achieved.

(a) It is economically advantageous because there is no need for manholes and no-endholes, and there is no need to restore pavement or cut around facilities managed elsewhere.

(b) Early opening of transportation can be planned.

C→ Noise etc. during construction can be reduced because the inconvenience to third parties is short-lived. ◎ B) The required construction period is short.

(e) Effective use of equipment can be measured.

(F) In particular, it is possible to secure underground pipelines by avoiding cutting and turning, etc., even in areas where the width of facilities managed elsewhere is narrow.

(g) Equipment can be provided quickly to meet demand, and income can be expected to increase.

(g) Slide hole joints do not use bolts, so work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 (A). (B), (C), and (2) are diagrams explaining the construction procedure of pipe branch joints, Figure 3 is a perspective view of the branch pipe, and Figure 4 (A).
. (B) and (C) are diagrams showing one embodiment of the split socket, where (A) is a perspective view, (B) is a side view, and (C) is a partial view, and (C) is a partial view. FIG. 5 is an explanatory diagram of attachment of a reinforcing plate, FIG. 6 is a sectional view of a split socket portion, FIG. 7 is an explanatory diagram of a pipe branching with different diameters, and FIG. 8 is a diagram illustrating a conventional pipe branching. 1... Branch pipe, 2... Split socket, 3... Conduit,
4...Communication cable Figure 2 (a)

Claims (1)

[Claims] It consists of a branch pipe whose overall shape is Y-shaped and the main line side pipe is divided into two, and a split socket which is divided into two for connecting and fixing the pipe end of the branch pipe to the existing pipe line and branch pipe line. A pipe branching joint characterized by: