JPH09322348A - Method of fixing connection type duct sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible quick and reliable fixation of a connection type duct sleeve to a specific part and, moreover, to avoid the increase in the cost therefor. SOLUTION: A bellmouth 4 having a virtually trumpet-shaped fore end part is used as a connection type duct sleeve 3 for connecting an underground buried pipe 2 to a specific part 1 such as a hand hole or a manhole used for a cable common-use tunnel or the like, and the virtually trumpet-shaped fore end part 4A of the bellmouth 4 is pushed into an inside angular part 1a of a through hole 1A of the specific part 1 and fixed therein with a first elastic body 1 interposed between these parts. In this fixed state, a second elastic body 8 is inserted into a gap A between the peripheral surface of the through hole 1A of the specific part 1 and the outer surface of the bellmouth 4 from outside the specific part 1 and thereby the bellmouth 4 is fixed to the specific part 1.

Description

Detailed Description of the Invention

[0001]

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

The case of fixing the connection type duct sleeve for connecting the special portion and the underground buried pipe to the special portion will be described. First, the connection type duct sleeve is inserted into the through hole of the special portion. Position. After that, mortar is filled in the gap between the outer surface of the connection-type duct sleeve and the peripheral surface of the through hole of the special portion, and the mortar is solidified, whereby the fixing of the connection-type duct sleeve is completed.

In the method of fixing the connection-type duct sleeve described above, not only can the underground pipe be connected to the connection-type duct sleeve until the mortar is solidified, but also concrete and water can be mixed to form mortar. Since extra time was required, it was not possible to reduce the construction work time.

Therefore, there has been proposed a connection type duct sleeve which can be fixed to the through hole of the special portion without using mortar. That is, as shown in FIG. 9, the inner tubular member 10 having the collar portion 10A at the tip thereof.
And a female screw portion 11B on the inner surface of the distal end portion for screwing into a male screw portion 10B formed on the outer surface of the base end portion of the inner tubular member 10.
The connection-type duct sleeve 3 is constituted by the outer tubular member 11 on which is formed. For example, while inserting from the base end portion 10C of the inner tubular member 10 into the through hole 1A of the special portion 1,
The inner wall surface 1D of the special portion 1 and the inner cylindrical member 10 facing the inner wall surface 1D
After pressing the inner cylinder member 10 against the inner wall surface 1D via the disk-shaped first packing 12 that is inserted between the outer surface of the tip flange portion 10A, the inner cylinder member 10 protruding to the outside of the special portion 1. The outer cylinder member 11 is attached to the male screw portion 10B of the base end portion 10C.
The female screw portion 11B at the tip end of the wall portion 1 is sandwiched between the flange portion 10A of the inner tubular member 10 and the flange portion 11A of the outer tubular member 11, and the connection-type duct sleeve 3 is attached to the special portion 1. It can be fixed to the through hole 1A. still,
Reference numeral 13 shown in the drawing is a second packing interposed between the flange portion 11A of the outer tubular member 11 and the outer wall surface 1E.

According to the fixing method described above, the inner cylinder member 10 and the outer cylinder member 11 cannot be fixed to each other in a screwed state. In addition, the vibrations caused by them loosen the screwed state of the two, and the two move to the side away from each other, and the earth and sand enter between the flange portion 11A of the outer tubular member 11 and the outer wall surface 1E. Then, due to repeated large-scale uneven settlement, earthquakes, etc., the inner tubular member 10 and the outer tubular member 11 largely move to the side separated from each other,
In particular, when the wall thickness is large and a sufficient screwing margin between the inner tubular member 10 and the outer tubular member 11 cannot be secured, the outer tubular member 11 may come off from the inner tubular member 10.

Further, the diameter of the through hole 1A is formed larger than the outer diameter of the inner cylindrical member 10 so that the inner cylindrical member 10 can be easily inserted into the through hole 1A of the special portion 1. Since there is a certain amount of clearance A between the outer surface of the inserted inner cylindrical member 10 and the peripheral surface 1B of the through hole 1, for example, vibration generated in a direction orthogonal to the pipe line direction Although the tubular member 10 can be absorbed to some extent by moving in the diametrical direction of the through hole 1A, when a large force acts on the inner tubular member 10, the inner tubular member 10 may not only be damaged. The position of the inner cylinder member 10 with respect to the through hole 1A of the special portion 1 may be unexpectedly changed.

A special connectable duct sleeve 3 having an inner tubular member 10 having an external thread portion 10B formed on its outer surface and an outer tubular member 11 having an internal thread portion 11B formed on its inner surface.
In addition to having to manufacture the parts, the number of kinds of parts required for the construction work is increased, which is disadvantageous in terms of parts management and is high in cost.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is to solve the problem that the connection-type duct sleeve can be fastened to the special portion quickly and securely. In addition, it is possible to avoid the cost increase.

[0010]

In order to solve the above-mentioned problems, the present invention provides a connection type duct sleeve for connecting an underground pipe to a special portion such as a handhole or manhole used for an electric wire common groove. , A bell mouth having a substantially trumpet-shaped tip portion is used, and a substantially trumpet-shaped tip portion of the bell mouth is provided at an inner side corner portion of the through hole of the special portion between them.
After pressing and fixing through the elastic body, in this fixed state, the second elastic body is inserted from the outside of the special portion into the gap between the peripheral surface of the through hole of the special portion and the outer surface of the bell mouth, and both of these are inserted. Is fixed. That is, by pushing the substantially trumpet-shaped tip of the bell mouth into the inner side corner of the through hole of the special portion, the first elastic body located between the two elastically deforms, and the first elastic body of the first elastic body is deformed. By the restoring force, the substantially trumpet-shaped tip of the bell mouth can be fixed to the inner side corner of the through hole. After fixing the substantially trumpet-shaped tip of this bell mouth, the bellows is inserted into the gap between the peripheral surface of the through hole of the special portion and the outer surface of the bell mouth and elastically deformed by the restoring force of the second elastic body with respect to the through hole. The bell mouth can be securely fixed. Further, by fixing the bell mouth with the first elastic body and the second elastic body, it is possible to absorb the vibration generated by the unequal subsidence or the earthquake. Even if a force is applied, it is possible to avoid damage at these fixing points.

The second elastic body is composed of an annular body formed in a mountain-shaped cross section that is oriented in the horizontal direction, and is inserted into the gap from the top of the mountain shape of the annular body, and a bell mouth is attached to the special portion. By fixing, the annular body can be pushed from the outside into the through hole of the special portion to the inner side, and the area to be elastically actuated by the second elastic body can be increased.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In FIG. 1, a plurality of (3 in the figure) underground buried pipes are arranged in the left-right direction of a special portion 1 such as a manhole or a handhole to be installed for collectively arranging electric wires in the ground. Two
Are shown in section through the elastic joint 5 and the connecting duct sleeve 3, respectively.

As the connection-type duct sleeve 3, there is used a bell mouth 4 having a substantially trumpet shape in a side view, which is outwardly curved toward the tip 4A side. The bell mouth 4 is originally scratched when the cable is pulled in. The bell mouth 4 is inserted into the through hole 1A formed in the special portion 1 from the inside of the special portion 1 so that the bell mouth 4 is connected to the special portion 1 through. is there.

The base end portion 4B of the bell mouth 4 is connected to the one end portion 5A of the elastic joint 5 by being externally fitted thereto while allowing the movement thereof in the longitudinal direction. The other end 5B of the elastic joint 5 is externally fitted and fixed to the underground buried pipe 2 with an adhesive. In addition, 6 shown in the drawing is a rubber ring for increasing the airtightness by eliminating a gap between the inner surface of the elastic joint 5 and the outer surface of the underground buried pipe 2. The expansion joint 5 is omitted, and the underground pipe 2 is directly attached to the base end portion 4B of the bell mouth 4.
May be connected and implemented.

The fixing method for fixing the bell mouth 4 to the through hole 1A formed in the special portion 1 will be described. At the tip portion 4A of the bell mouth 4, the ring plate-shaped first portion shown in FIG. The elastic body 7 is externally fitted and mounted. The base end portion 4B of the bell mouth 4 to which the first elastic body 7 is attached is attached to the special portion 1
When inserted into the through hole 1A from the inside, the surface of the first elastic body 7 mounted on the outer surface of the tip portion 4A of the bell mouth 4 comes into contact with the inner side corner portion 1a of the through hole 1A. 4 insertion is blocked. Then, by further pushing the bell mouth 4 into the through hole 1A side from this contact state, the bell mouth 4 is fixed at that position. In this fixed state, the bell mouth 4 is firmly fixed by inserting the second elastic body 8 from the outside of the special portion 1 into the gap A between the peripheral surface 1B of the through hole 1A and the outer surface 4H of the bell mouth 4. is there.

The second elastic body 8 is, as shown in FIG.
It is composed of an annular body formed in a mountain shape having a cross-sectional shape facing in the horizontal direction, and is inserted into the gap A from the mountain top 8A of the annular body 8 to fix the bell mouth 4 to the special portion 1. The bell mouth 4 can be further fixed in that position.

After the bell mouth 4 is fixed to the special portion 1, a reinforcing ring member 9 is externally inserted into the bell mouth 4 from the base end portion 4B of the bell mouth 4 as shown in FIGS. This allows the second elastic body 8 to be pushed into the through hole 1A. After this, the second
By externally fixing the elastic body 8 with an adhesive, the bell mouth 4 can be further firmly fixed to the special portion 1. The ring-shaped member 9 may be omitted and implemented. By forming the second elastic body 8 so that the end portion of the second elastic body 8 on the ring-shaped member 9 side is largely projected to the outside of the through hole 1A as shown in the figure, for example, when an earthquake or the like occurs. Even if the special portion 1 vertically vibrates due to the occurrence, the outer surface of the special portion 1 does not contact the ring-shaped member 9 so that the ring-shaped member 9 is not displaced. Therefore, even when an earthquake occurs, the ring-shaped member 9 can reliably prevent the second elastic body 8 from moving in the longitudinal direction of the bell mouth 4. As the ring-shaped member 9, a ring-shaped member may be used instead of an annular member. Further, the second elastic body 8 is formed so that the length from the peak-shaped top portion 8A of the cross-sectional shape of the second elastic body 8 to the outer foot or the inner foot is different from each other. The second elastic body 8 may be formed so that the length to the inner foot is the same, and the shape of the second elastic body 8 is not limited to these. In FIG. 5, the bell mouth 4 is fixed so that the right end of the bell mouth 4 is located above the horizontal line S in the figure.

The inner corner 1a of the through hole 1A formed in the special portion 1 is formed into a curved shape along the outer surface of the tip 4A of the bell mouth 4 as shown in FIG. It is possible to reduce the amount of protrusion of the special portion 1 inward.

As shown in FIG. 7, the second elastic body 8 is
It may be composed of a plurality of spheres. Also, instead of a sphere,
What is shown in (a) to (f) of FIG. 8 may be used. That is, FIG. 8A shows a cylindrical shape, FIG. 8B shows a conical shape, FIG. 8C shows a triangular prism shape, and FIG. 8D shows a tip portion 8a. Shows a mountain shape in a side view formed in a curved surface, FIG. 8 (e) shows a trapezoidal shape in side view, and FIG. 8 (f) shows a prismatic shape. As shown in FIGS. 8B, 8C, 8D, and 8E, in the case of the second elastic body 8 which is tapered toward the tip side, the inside of the special portion 1 shown in FIG. There is an advantage that the second elastic body 8 can be easily inserted from the outside of the special portion 1 into the gap A that becomes narrower toward the side.

[0020]

According to the first aspect of the present invention, the connection-type duct sleeve is constituted by the existing bell mouth having the substantially trumpet-shaped tip portion and the first elastic body and the second elastic body.
It is possible to quickly fix the connection-type duct sleeve without using mortar, and it is possible to avoid the need for manufacturing a special connection-type duct sleeve as in the conventional case and avoid the cost increase. . Moreover, by elastically holding the bell mouth at the two positions of the through hole of the special portion, the bell mouth can be securely fixed to the through hole of the special portion without rattling, and for example, uneven settlement or earthquake. Even if the product is used in a place where a lot of things occur, the elastic material can surely absorb the vibration caused by them, so the position of the bell mouth will change with respect to the through hole of the special part for a long period of time. It can be fixed in place without doing so.

According to the second aspect, since the area of the second elastic body to be elastically actuated can be increased, the bell mouth can be further securely fixed to the through hole of the special portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing a state in which an underground pipe is connected to a special portion via a connection duct sleeve.

FIG. 2 is a sectional view showing a connection portion of a bell mouth.

FIG. 3 is a sectional view of a first elastic body.

FIG. 4 is a sectional view of a second elastic body.

FIG. 5 is a sectional view showing another embodiment in which the bell mouth is fixed in an inclined posture.

FIG. 6 is a cross-sectional view of another embodiment showing the connection portion of the bell mouth in which the shape of the inner side corner portion of the through hole is changed.

FIG. 7 is a sectional view showing another embodiment of the connection portion of the bell mouth.

8] (a), (b), (c), (d), (e),
(F) is a perspective view showing another embodiment of the second elastic body.

FIG. 9 is a sectional view showing a conventional connection-type duct sleeve.

[Explanation of symbols]

 1 Special part 1A Through hole 1B Circumferential surface 1D Inner wall surface 1E Outer wall surface 1a Inner side corner 2 Underground pipe 3 Connection duct sleeve 4 Bell mouth 4A Tip 4B Base 4H Outer surface 5 Expansion joint 5A One end 5B Other end part 6 Rubber ring 7 First elastic body 8 Second elastic body 8A Top part 8a Tip part 10 Inner cylinder member 10A Collar part 10B Male screw part 10C Base end part 11 Outer cylinder member 11A Collar part 11B Female screw part 12 No. 1 Packing 13 2nd packing A Gap S Horizontal line

Claims (2)

[Claims] 1. A bell mouth having a substantially trumpet-shaped tip portion is used as a connection-type duct sleeve for connecting a buried underground pipe to a special portion such as a handhole or manhole used for an electric wire common groove or the like, and the special portion is used. After the substantially trumpet-shaped tip of the bell mouth is pushed into the inner corner of the through hole through the first elastic body between them to fix the same, the circumference of the through hole of the special part is fixed in this fixed state. A method of fixing a connection type duct sleeve, wherein a second elastic body is inserted into the gap between the surface and the outer surface of the bell mouth from the outside of the special portion, and the bell mouth is fixed to the special portion. 2. The second elastic body is composed of an annular body formed in a mountain-shaped cross section that is oriented in the horizontal direction, and the second elastic body is inserted into the gap from the top of the mountain shape of the annular body to form a bell in the special portion. How to fix the connecting duct sleeve to fix the mouse.