JPH09284968A - Connectable duct sleeve - Google Patents

Abstract

(57) [Abstract] [PROBLEM] To easily and quickly connect to a special part, and without being restricted by the installation work of the electric wire, and without increasing the size of the special part, the electric wire on the cable rack. The point is to provide a connection-type duct sleeve that can be placed smoothly and reliably. SOLUTION: In a connection type duct sleeve for connecting an underground pipe 2 to a special portion 1 such as a handhole or manhole used for an electric wire common groove or the like, a substantially trumpet-shaped tip portion 4 is provided.
A bell mouth 4 is connected to A through the special portion 1, and an elastic joint 5 is connected to a base end portion 4B of the bell mouth 4.
And connecting the underground buried pipe 2 to the elastic joint 5, and bending and forming the body portion 4C of the bell mouth 4 with respect to the opening 4K of the substantially trumpet-shaped tip portion 4A of the bell mouth 4. It becomes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connectable duct sleeve for connecting a special portion such as a handhole or a manhole used for an electric wire common groove to a buried underground pipe.

[0002]

2. Description of the Related Art The above-mentioned electric wire joint groove is a special portion (connecting portion, branching portion, etc.) installed for realizing underground burying of electric power cables, communication cables, cables for road managers, etc. collectively. ), Pipelines, and ground equipment. The feature is the conventional cab (cable box)
Compared to the system, the aim is to reduce the space between the pipe sections and make it compact and shallow, or to reduce the price (about 1/3 of the cab).

As a connection type duct sleeve for connecting the above-mentioned special part and the underground pipe, for example, the one shown in FIG. 8 is generally used. The substantially trumpet-shaped tip 10A of the duct sleeve 10 serves as a manhole 1 as a special portion.
After being inserted into the window frame 1B formed in the above, the gap between the window frame 1B and the outer surface of the duct sleeve 10 is filled with mortar 7 so that the duct sleeve 10 is penetratingly connected into the window frame 1B of the manhole 1. ing. Then, the underground buried pipe 2 is slidably fitted in the base end portion of the duct sleeve 10 in the longitudinal direction thereof so that the underground buried pipe 2 can be expanded and contracted in the longitudinal direction, and the electric wire joint groove is formed. It is designed to have total earthquake resistance. Reference numeral 6 shown in the drawing is a rubber ring for eliminating a gap between the duct sleeve 10 and the underground pipe 2.

The duct sleeve 10 having the above-described structure has a rubber ring 6 for the first outer diameter dimension r of the substantially trumpet-shaped tip opening.
This is a shape in which the second outer diameter dimension R of the portion into which is entered is larger. Therefore, the opening dimension of the window frame 1B of the manhole 1 is smaller than the second outer diameter dimension R of the duct sleeve 10 so that the duct sleeve 10 can be inserted into the window frame 1B of the manhole 1 from inside or outside. The window frame 1B is formed so as to be large. Therefore, since the window frame 1B of the manhole 1 is larger than the size of the substantially trumpet-shaped tip opening of the duct sleeve 10, the mortar is used to join the substantially trumpet-shaped tip opening of the duct sleeve 10 into the window frame 1B. The tip opening unexpectedly moves inside the window frame 1B during the application of 7 and the substantially trumpet-shaped tip opening of the duct sleeve 10 must be aligned many times. The work of connecting the duct sleeve 10 to the first window frame 1B is time-consuming and cumbersome.

Further, for example, in order to change the guide route of the electric wire guided from the window frame 1B of the manhole 1 to the outside of the manhole 1 through the duct sleeve 10, the straight duct sleeve 10 and the underground buried pipe 2 are used. A bent pipe or a universal joint is interposed between the bent pipe and the universal joint, but the guide path of the electric wire can be changed only from a position after the end portion of the duct sleeve 10 on the underground buried pipe side. Since there is a restriction on the curvature of the universal joint, the guide path of the electric wire cannot be changed as desired, and there is a disadvantage that the installation work of the electric wire is restricted. Also, when the electric wire is pulled in on the cable rack provided on one side in the left-right direction in the manhole, the duct sleeve is linear as described above,
Especially, the electric wire inserted from the upper part of the window frame of the manhole cannot be greatly bent to one side in the left-right direction, and the electric wire drawn from the position farthest from the cable rack cannot be placed on the cable rack. In some cases, only part of the electric wire could be placed on the cable rack. Therefore, if the dimension of the manhole in the wire drawing direction, that is, the dimension of the depth of the manhole is increased, the above inconvenience can be avoided, but the manhole itself becomes large, and there is room for improvement.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problem that the connection work to the special portion can be performed easily and quickly, and the installation work of the electric wire is not restricted. Further, another object is to provide a connection-type duct sleeve that can smoothly and surely place an electric wire on a cable rack without increasing the size of a special portion.

[0007]

In order to solve the above-mentioned problems, the present invention provides a connection type duct sleeve for connecting an underground buried pipe to a special portion such as a handhole or a manhole used for an electric wire common groove. , A bell mouth having a substantially trumpet-shaped tip portion penetratingly connected to the special portion, and an elastic joint connected to a base end portion of the bell mouth, and connecting the underground buried pipe to the elastic joint At the same time, the body portion of the bell mouth was bent and formed in the opening of the substantially trumpet-shaped tip portion of the bell mouth to form a connection-type duct sleeve. Therefore, the bell mouth is inserted from the inside of the special portion from the base end portion on the side opposite to the substantially trumpet-shaped tip portion of the bell mouth, and this insertion is performed by contacting the substantially trumpet-shaped tip portion of the bell mouth with the special portion. It is blocked, and the positioning of the bell mouth with respect to the special portion is completed. After that, the bell mouth can be fixed to the special portion by filling the gap between the bell mouth and the special portion with mortar or the like. Then, by connecting one end of the elastic joint to the base end of the bell mouth and connecting the underground buried pipe to the other end of the elastic joint, it is possible to allow the underground buried pipe to move in the longitudinal direction. Can be In addition, even if there is a buried object near the special part, by using a bell mouth that is bent,
It is possible to bypass the underground buried object by immediately changing the guide route of the electric wire from the exit of the special section. Also, when placing the electric wire drawn inside through the through hole of the special part on the cable rack provided on the left and right sides of the special part,
By using a bent bell mouth, you can change the electric wire to a position facing the cable rack in advance outside the special part, and it is easy to put on the cable rack without bending the electric wire drawn inside. Can be placed on.

Since the inner portion of the special portion of the peripheral surface of the through hole formed in the special portion is formed as a concave portion into which the substantially trumpet-shaped tip of the bell mouth is inserted, the substantially trumpet of the bell mouth is formed. Not only can the positioning of the special shaped part in the through hole be made easier by inserting the shaped tip into the concave part, but the tip of the bell mouth that is roughly trumpet-shaped protrudes from the inner wall surface of the special part. There is nothing to do.

[0009]

1 and 2, a plurality of (three in the figure) undergrounds are provided on the left and right of a special portion 1 such as a manhole or a handhole to be installed for collectively arranging electric wires in the ground. A cross-sectional view is shown in which the buried pipes 2 are each connected via a connecting duct sleeve 3.

The connection type duct sleeve 3 has a special portion 1
The bell mouth 4 is connected to the base end 4B of the bell mouth 4 and the elastic joint 5 is connected to the underground buried pipe 2. still,
Reference numeral 6 shown in the figure is a rubber ring for increasing the airtightness by eliminating the gap between the inner surface of the elastic joint 5 and the outer surface of the bell mouth 4.

The bell mouth 4 is originally used to prevent the cable from being damaged when the cable is pulled in, and the tip portion 4A of the bell mouth 4 is curved so that it extends outward as it approaches the side. The bell mouth 4 is formed in a substantially trumpet shape, and the main body portion 4C including the base end portion 4B excluding the tip end portion 4A of the bell mouth 4 is formed in a linear shape. Therefore, when the bell mouth 4 is inserted from the inside of the special portion 1 through the through hole 1A formed in the special portion 1 from the base end portion 4B thereof, the outer surface of the tip portion 4A of the bell mouth 4 surrounds the circumference of the through hole 1A. The bell mouth 4 is prevented from being inserted by contacting the lower side portion of the inner side corner portion 1a of the surface, and the positioning of the bell mouth 4 is completed. 2 is a special section 1
A mortar for fixing the bell mouth 4 to the through hole 1A formed in the mortar. Instead of this mortar, an O-ring,
A sealing material, expansive rubber or the like may be used. This expandable rubber has a property of expanding due to moisture absorption. As described above, the outer surface of the tip portion 4A of the bell mouth 4 is brought into contact with only the lower portion of the inner corner 1a of the peripheral surface of the through hole 1A. By reducing the diameter of the corner portion 1a and curving the portion extending from the corner portion 1a to the inside of the special portion 1 more outwardly than the above, the outer surface of the tip portion 4A of the bell mouth 4 is entirely covered with the peripheral surface of the through hole 1A. The bell mouth 4 may be abutted over the circumference so that the bell mouth 4 can be positioned more easily.

The distal end portion 5A of the elastic joint 5 is fitted onto the proximal end portion 4B of the bell mouth 4 while allowing the longitudinal movement of the distal end portion 5A, and the free end portion 5 of the elastic joint 5 is also fitted.
The underground buried pipe 2 is internally fitted and fixed to B by an adhesive so that the underground buried pipe 2 can be expanded and contracted integrally with the elastic joint 5 in accordance with the occurrence of vibration in the ground. Since the tip end portion 5A and the free end portion 5B of the elastic joint 5 are cylindrical, the underground buried pipe 2 is moved in the longitudinal direction with respect to the bell mouth 4 via the elastic joint 5 as described above. As shown in FIG. 4, the bell mouth 4 and the underground buried pipe 2
The connection relationship of the elastic joint 5 with respect to
It may be carried out in reverse. That is, the tip end 5A of the elastic joint 5 is externally fitted and fixed to the base end 4B of the bell mouth 4 with an adhesive, and the free end 5B of the elastic joint 5 is buried in the underground pipe 2.
The underground buried pipe 2 can be moved in the longitudinal direction with respect to the expandable joint 5 by being externally fitted to one end of the pipe while allowing the movement in the longitudinal direction. Further, the elastic joint 5 itself may be provided with a bellows portion so that the underground joint pipe 2 can be moved in the longitudinal direction by the expansion and contraction of the elastic joint 5.

A case where the underground buried pipe 2 is connected to the special portion 1 through the connection-type duct sleeve 3 will be described. In FIG. 1, first, in the through hole 1A formed in the special portion 1 as described above, After the bell mouth 4 is inserted from the inside of the portion 1 and positioned, the bell mouth 4 is fixed to the through hole 1A by the mortar 7. The elastic joint 5 is externally fitted to the base end 4B of the fixed bell mouth 4, and the underground buried pipe 2 is internally fitted and fixed to the free end 5B of the elastic joint 5 with an adhesive. The connection order of the bell mouth 4, the elastic joint 5, and the underground buried pipe 2 is not limited to this. Alternatively, the mortar 7 may be applied to the through hole 1A before being inserted into the bell mouth 4 through hole 1A.

A substantially trumpet-shaped tip portion 4A of the bell mouth 4
The main body 4C of the bell mouth 4 to the opening 4K of
The base end portion 4B is bent and formed in a posture facing one side in the left-right direction. That is, in FIGS. 1 and 2, in order to mount the bell mouth 4 on the cable rack 8 provided on one side in the left-right direction of the special portion 1, the bell mouth 4 is separated from the cable rack 8 toward the base end portion 4B side thereof. It is set in a bent posture positioned at the position such that the electric wire 9 drawn into the special portion 1 can be directed toward the cable rack 8 side even a little, so that the bell mouth 4 can be placed on the cable rack 8 side. When the electric wire 9 is pulled up to, the electric wire 9 can be smoothly moved and guided without being bent to a nearly right angle. Incidentally, in contrast to FIG. 1, in FIG.
A large radius of curvature of the bell mouth 4 is shown. Further, the bell mouth 4 may be set in a posture in which the base end portion 4B of the bell mouth 4 is displaced not only in the left-right direction but also in the downward direction. In short, the bell mouth 4 formed by bending is rotated about the opening 4K as a fulcrum. The position may be set at any position on the circumference drawn by the base end portion 4B when it is made to move. 8A shown in the figure is a stopper for fixing the electric wire 9 on the cable rack 8. The stopper 8A ... Is omitted and the electric wire 9 is simply placed on the cable rack 8. May be. The cable rack 8 is composed of a plurality of mounting support plate members provided in the depth direction of the special portion 1, and is also composed of a mounting plate on which the electric wires 9 are mounted. However, the specific configuration of the cable rack 8 can be freely changed. As described above, by using the bent bell mouth 4, the underground buried pipe 2 is displaced laterally with respect to the through hole 1A of the special portion 1, but the underground buried pipe 2 is arranged. Since the electric wire common groove for installation is excavated in a large size, the displacement of the underground buried pipe 2 can be reliably absorbed.

As shown in the drawing, the inner portion of the special portion 1 of the peripheral surface of the through hole 1A formed in the special portion 1, that is, the inner side corner portion 1a is substantially a trumpet of the bell mouth 4. 4A is formed in a concave portion into which the concave portion 1a is inserted.
By aligning the substantially trumpet-shaped tip portion 4A of the bell mouth 4 along the direction, the wall surface 1D of the special portion 1 and the opening 4K of the substantially trumpet-shaped tip portion 4A of the bell mouth 4 are flush with each other, The substantially trumpet-shaped tip portion 4A of the bell mouth 4 is prevented from projecting inside from the wall surface 1D of the portion 1. Although the through-hole 1A has a shape that expands outward toward the outlet side, it may be formed to have the same diameter at any position, and the shape of the through-hole 1A may be any shape.

As shown in FIGS. 3 and 4, by using a bell mouth 4 having a radius of curvature different from that of the bell mouth 4, the electric wire path can be immediately changed from the outlet of the special portion 1. . Therefore, even if there is an underground buried object near the special section 1, it is possible to immediately change the electric wire route from the exit of the special section 1 with the bell mouth 4 to bypass the underground buried object. The angle of the buried pipe 2 can be changed as desired, the installation work of the electric wire is not restricted, and the flexibility of the position of the special portion 1 and the design of the underground buried pipe 2 can be expanded. Incidentally, FIG. 4 is a view in which the connecting direction of the elastic joint 5 shown in FIG. 3 is reversed.

5 (a) and 5 (b) show bell mouths 4 having different radii of curvature, and FIGS. 6 (a) and 6 (b) show the body 4C of the bell mouth 4 which is linear. , Again 7
(A) and (b), the substantially trumpet-shaped tip portion 4A of the bell mouth 4
It shows a straight line.

[0018]

According to the first aspect of the present invention, by using the existing bell mouth having the substantially trumpet-shaped tip portion having the maximum diameter, the duct sleeve is unexpectedly fixed when the conventional duct sleeve is fixed to the special portion. Since it is possible to surely prevent the special portion from being displaced in the window frame, it is possible to provide a connection-type duct sleeve that can easily and quickly perform the work of connecting to the special portion. Moreover, by connecting an elastic joint to the base end of the bellmouth, it becomes possible to move the underground pipe in the longitudinal direction, and it is possible to provide total seismic resistance of the wire joint groove as in the past. . Furthermore, by using a bent bell mouth, the guide route of the electric wire can be changed immediately from the exit of the special section, and even if there is an underground buried object near the special section, it can be bypassed. , It is possible to expand the degree of freedom in designing the location of special parts and underground pipes without being restricted by the installation work of electric wires. Also, even when pulling the wire into the cable rack in the special section, the bent bell mouth can be used to change the direction of the wire before entering the special section. It can be easily placed on the cable rack without bending it in the direction, and the installation work of the electric wire can be easily performed.

According to the second aspect, by inserting the substantially trumpet-shaped tip portion of the bell mouth into the recess, the substantially trumpet-shaped tip portion of the bell mouth does not project inside the special portion, and the electric wire It is possible to avoid touching the tip of the bell mouth protruding during wiring work, and to prevent other objects from being caught.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a state where an underground pipe is connected to a special portion via a connection duct sleeve.

FIG. 2 is a vertical sectional side view showing a state in which an underground buried pipe is connected to a special portion via a connection-type duct sleeve.

FIG. 3 is a vertical cross-sectional side view showing a state in which an underground pipe is connected to a special portion via a connection duct sleeve.

FIG. 4 is a vertical cross-sectional side view showing a state where an underground pipe is connected to a special portion through a connection duct sleeve.

FIG. 5 shows another embodiment of the bell mouth, (a) is a perspective view, and (b) is a vertical side view.

FIG. 6 shows another embodiment of the bell mouth, (a) is a perspective view and (b) is a vertical side view.

FIG. 7 shows another embodiment of the bell mouth, (a) is a perspective view and (b) is a vertical side view.

FIG. 8 is a vertical sectional side view showing a conventional connection-type duct sleeve.

[Explanation of symbols] 1 Special part 1A Through hole 1B Window frame 1D Wall surface 1a Corner (recess) 2 Underground pipe 3 Connection duct duct 4 Bell mouth 4A Tip 4B Base 4C Body 4K Opening 5 Expansion and contraction Sex joint 5A Tip 5B Free end 5C Projection 5D Recess 6 Rubber ring 7 Mortar 8 Cable rack 8A Stopper 9 Electric wire 10 Duct sleeve 10A Tip r First outside diameter R Second outside diameter

Claims (2)

[Claims] 1. A connection type duct sleeve for connecting an underground buried pipe to a special portion such as a handhole or a manhole used for an electric wire common groove or the like, and a substantially trumpet-shaped tip portion is penetratingly connected to the special portion. A bell mouth and an elastic joint that is connected to the base end of the bell mouth are provided, and while connecting the underground buried pipe to the elastic joint, with respect to the opening of the substantially trumpet-shaped tip of the bell mouth. A connection-type duct sleeve formed by bending the main body of the bell mouth. 2. The inside of the special portion of the peripheral surface of the through hole formed in the special portion is formed as a concave portion into which the substantially trumpet-shaped tip of the bell mouth is inserted. Connectable duct sleeve.