JP3326423B2 - Closed holding device for cable conduit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for closing and holding a cable conduit used to cover the open end of the conduit through which the cable is inserted and to hold the cable.

[0002]

2. Description of the Related Art Conventionally, for example, power cables, optical cables, and other communication cables have been inserted through conduits buried underground, and the underground conduits are connected to manholes at predetermined intervals. Have been.

[0003] Therefore, the pipe is opened with the open end facing the manhole, and a cable passing through the pipe is introduced into the manhole from the open end.

[0004]

Generally, since the inner diameter of the conduit is formed larger than the outer diameter of the cable, the open end of the conduit facing the manhole is opened around the cable. As a result, foreign matter such as water, dirt, oil, and pebbles in the manhole can easily enter the conduit through the opening, thereby possibly damaging the cable.

Further, when such foreign matter enters the conduit, the cable adheres to the conduit due to a chemical reaction of the cable coating and an inorganic compound contained in oil and water, and the cable is connected when the cable is replaced. May not be able to be extracted from Alternatively, it may be difficult to insert a new cable after pulling out the cable.

[0006]

Means for Solving the Problems The present invention solves the above-mentioned problems, and provides an apparatus that covers an open end of a conduit through which a cable is inserted and holds the cable, and that holds the cable. What we have configured as that means
A cylindrical main body comprising a flange facing the open end of the conduit, a large-diameter cylindrical portion inserted into the passage from the conduit opening, and a small-diameter cylindrical portion surrounding the cable outside the conduit. In each of the divided bodies formed by dividing the cylindrical body in the circumferential direction, a flange divided piece that divides the flange, and a large-diameter divided piece that divides the large-diameter cylindrical portion,
A small-diameter divided piece constituting the small-diameter cylindrical part, and by fastening the small-diameter divided pieces constituting the small-diameter cylindrical part to each other in the radially-reducing direction by connecting means, the side edge of the flange divided piece is used as a fulcrum p. The small-diameter split pieces are joined together, the large-diameter split pieces are expanded, the cable is hung by the reduced-diameter small-diameter tubular section, and the expanded large-diameter cylindrical section is pressed against the inner peripheral surface of the pipeline. It is configured in such a manner.

In a preferred embodiment of the present invention, brackets adjacent to each other of the small-diameter divided pieces are provided, and the connecting means is constituted by bolts and nuts for fastening the adjacent brackets to each other.

Preferably, an elastic rim is provided at the free end of the large-diameter split piece constituting the cylindrical edge of the large-diameter cylindrical portion, and the elastic rim is pressed against the inner peripheral surface of the conduit. .

As a power cable, a configuration is known in which a triplex cable in which three cables are bundled is inserted through a pipeline, and in this case, at least a portion facing a small-diameter cylindrical portion is provided. The center space surrounded by the three cables is filled with a center seal piece having a substantially triangular cross section, and the space between the adjacent peripheral surfaces of the three cables and the inner peripheral surface of the small-diameter cylindrical portion is provided. It is preferable to load a peripheral seal piece having a substantially fan-shaped cross section in the portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

[0011] In a known cable conduit in which a cable 2 is inserted through a conduit 1 buried in the ground and an open end 3 of the conduit faces a manhole 4, the closed holding device of the present invention is used. An example is shown in FIG. In addition, pipeline 1
Consists of an earthen pipe or other pipe structure, is buried in the soil 5, and the manhole 4 is, for example, a concrete wall 6
Is formed. In the case of the example shown in FIG.
Although a triplex cable in which the cables 2a are bundled is shown, the present invention is not limited to this.

As shown in FIG. 1, the closure holding device of the present invention forms a cylindrical main body 7 and has a disc-shaped flange 8 facing the open end 3 of the conduit, and a tubular main body 7 formed by the opening of the conduit. It has a cylindrical large-diameter tubular portion 9 inserted into the road and a cylindrical small-diameter cylindrical portion 10 surrounding the cable 2 outside the conduit. The cylindrical portion 9 is arranged substantially concentrically, but the small-diameter cylindrical portion 10 is arranged eccentrically. Therefore, it is possible to cover the cable 2 while suppressing the movement of the cable 2 as much as possible.

The cylindrical main body 7 is composed of a divided body 11 divided in the circumferential direction. In the illustrated embodiment, the cylindrical main body 7 is composed of three divided bodies 11a, 11b and 11c, but the number is not limited. In the case of a configuration with three divisions as shown in the figure, one divided body 11a is formed so that the flange is substantially V-shaped. The remaining two divided bodies 11b and 11c
Can be formed in an arbitrary divided form, but may be formed in a mutually symmetric shape.

Therefore, the divided bodies 11 (11a, 11b, 1
1c) includes a flange divided piece 8a that divides the flange 8, a large-diameter divided piece 9a that divides the large-diameter cylindrical part 9, and a small-diameter divided piece 10a that divides the small-diameter cylindrical part 10. Is provided.

Each divided body 11 (11a, 11b, 11c)
The brackets 12 adjacent to each other are provided on the small-diameter divided piece 10a so as to extend in the radial direction of the small-diameter cylindrical portion 10. The divided body 11 is preferably made of metal. In this case, each bracket 12 is fixed to the small-diameter divided piece 10a and the flange divided piece 8a by welding. Or,
The divided body 11 may be formed of reinforced plastic,
In this case, the entire bracket 12, the small-diameter divided piece 10a, and the flange divided piece 8a can be integrally formed.

As shown in FIG. 2, the bracket 12 of each divided body 11 is provided with a hole through which a bolt is inserted. In the case of the illustrated embodiment, a pair of divided bodies 1
Brackets 12s, 12 adjacent to each other of 1b, 11c
s is provided with one hole 13s that matches each other, but the brackets 12 and 12 adjacent to each other in the divided body 11a formed in a substantially V shape and the other two divided bodies 11b and 11c are provided. Is provided with a pair of holes 13a and 13b which are mutually matched at intervals in the radial direction of the flange 8. As described later, of the pair of holes 13a and 13b,
One hole is used for positioning, and the other hole is used as a fastening hole for expanding the large-diameter cylindrical portion 9.

Further, the dividing surface of the name dividing member 11 is defined by a distance between a side edge 8e of the flange dividing piece 8a and an edge 12e of the bracket 12.
A tapered surface 14 (shown as an angle θ in FIG. 4 (A)) is formed so that the thickness of the bracket 12 is tapered toward.

Further, an elastic rim 15 made of rubber or the like is attached to each free end of the large-diameter divided piece 9a constituting the cylindrical edge of the large-diameter cylindrical portion 9.

In order to effectively achieve the object of the present invention, at least a portion facing the small-diameter cylindrical portion 10 and a central space surrounded by the three cables 2a has a substantially triangular cross section made of rubber or the like. The central sealing piece 16 formed in the above is loaded. Further, in three spaces formed between the peripheral surfaces of the three cables 2a that are adjacent to each other and the inner peripheral surface of the small-diameter cylindrical portion 10, peripheral portions each formed in a substantially fan-shaped cross section by rubber or the like. The sealing piece 17 is loaded.

The method of use and operation of the present invention based on the above configuration will be described. With the center seal piece 16 and the three peripheral seal pieces 17 loaded as described above, 3 Divided bodies 11 (11a, 11b, 1
1c), the outer circumference of the cable 2 is surrounded by the small-diameter split piece 10a, the large-diameter split piece 9a is inserted into the opening of the pipeline 1, and the flange split piece 8a is opposed to the open end 3 of the pipeline 1. . At this time, as shown in FIG. 3, it is desirable that the small-diameter cylindrical portion 10 constituted by the small-diameter divided pieces 10 a is arranged so as to face the bottom of the pipeline 1.

In this state, since the tapered surface 14 is formed on the bracket 12 of the name division body 11 as described above, as shown in FIG. Bracket 12s, 1
The tapered surfaces 14, 14 are open to each other between 2s as indicated by an angle θ. Although FIG. 4 shows the angle θ in an exaggerated manner to facilitate understanding of the operation of the present invention, it should be appreciated that the angle θ can be arbitrarily designed.

Then, a pair of brackets 12, 12 adjacent to each other of each divided body 11 are bolted to each other through a hole 13.
When the bracket 1 is connected and fastened by a connecting means 19 constituted by a nut 18, the bracket 1 is set so that the angle θ is narrowed with the side edge 8e of the flange divided piece 8a as a fulcrum p.
2 and 12 are tightened, whereby the small-diameter divided piece 10a constituting the small-diameter cylindrical portion 10 is fastened in the diameter-reducing direction, and the cable 2
Hug. At the same time, the large-diameter split piece 9a constituting the large-diameter cylindrical portion 9 is expanded by the above-mentioned fulcrum p, and the elastic rim 15 is pressed against the inner peripheral surface of the pipeline 1. Therefore, the cylindrical main body 7 assembled by the divided pieces 11 corresponds to FIGS.
As shown in (B), the large-diameter cylindrical portion 9 is strongly fixed to the pipeline 1 together with the anti-slip effect by the compression of the elastic rim 15, and the small-diameter cylindrical portion 10 strongly holds the cable 2 outside the road. To wear. At this time, the elastic rim 15 is compressed as a result of being pressed against the inner side surface of the pipe 1 and extends in the circumferential direction of the large-diameter cylindrical portion 9, so that the elastic rim 15 is divided between the divided surfaces of the divided bodies 11 a, 11 b and 11 c. Is closed to prevent foreign matter from entering (that is, the gap s shown in FIG. 4B is closed by the extension of the elastic rim 15).

In the case of the configuration based on the illustrated embodiment, the assembly of the divided bodies 11 (11a, 11b, 11c) and the connecting means 1
9 beforehand, the holes 13 (13
a, 13b, 13s), bolts and nuts 18 (coupling means 1) at the hole 13s.
When 9) is tightened, the divided bodies 11 are held together with the tapered surfaces 14 formed between the brackets 12s.
The large diameter divided pieces 9a, 9a of b, 11c are expanded. As a result, the other holes 13a, 1a of the divided bodies 11b, 11c
3b, at least the position of the outer hole 13a is slightly moved. However, since the roughly V-shaped divided body 11a is temporarily fixed by a bolt inserted in advance, a set of holes 13a is temporarily fixed.
a, 13a and a pair of holes 13b, 13b are positioned coaxially with each other. Therefore, the holes 13a,
When the bolt / nut 18 (connection means 19) is tightened at the portion 13b, the pair of divided bodies 11b, 11
For c, the V-shaped divided body 11a is a bracket 12,
Large-diameter divided piece 9a while joining 12 tapered surfaces 14 and 14
Are expanded, and three divided bodies 11a and 11
The large-diameter divided pieces 9a of b and 11c are pressed against the inner surface of the pipeline 1 and pressed. As described above, one of the pair of holes 13a and 13b functions for positioning, and the other hole functions for expanding the large-diameter split piece 9a by fastening.

The divided bodies 11a, 11 thus divided into three parts
In the case of the illustrated embodiment constituting b, 11c, first, the left and right divided bodies 11b, 1c, 1b,
1c, one hole 1 of adjacent brackets 12s, 12s
3s, and then tighten two bolts and nuts 18 in the other brackets 12,12.
The work is facilitated by tightening the bolts and nuts 18 inserted through the 3a, 13b.

In this state, the triplex type cable 2 held by the small-diameter cylindrical portion 10 facing the manhole 4
The space located at the center of the three cables 2a is sealed by a central seal piece 16, and the space between each cable 2a and the small-diameter cylindrical portion 10 is sealed by a peripheral seal piece 17, so that foreign matter Is the conduit 1 through the small-diameter tube portion 10.
Do not invade. Further, since the flange 8 is disposed opposite to the opening edge 3 of the pipe 1 facing the manhole 4, it is possible to prevent foreign matter from entering the pipe 1 from the opening end. The gap between the open end of the pipe 1 and the flange 8,
When it is necessary to seal a gap or the like generated between the enlarged large-diameter divided pieces 9a, a fluid sealant such as silicone rubber is applied to those portions when the divided bodies 11 are combined. good.

It is needless to say that the present invention is not limited to the above embodiment. For example, in the example shown in FIG.
Although the divided body 11 is shown as being divided, the number of divisions is not limited, as long as it is two or more. Further, the configuration in which the bracket 12 is fastened with the bolts and nuts 18 as the connecting means 19 has been described, but the small diameter cylindrical portion 10 may be fastened with a band or the like. Furthermore, the side edge 8e of the flange split piece 8a
Although the tapered surface 14 having the fulcrum p has been described,
A configuration in which a wedge is driven may be used. In short, any configuration that allows the small-diameter cylindrical portion 10 to be reduced in diameter and the large-diameter cylindrical portion 9 to be expanded in diameter may be used. In addition, the present invention, in addition to underground pipelines having manholes, piping in buildings,
In addition, the present invention is widely applicable to a pipe through which a cable is inserted.

[0027]

According to the present invention, it is possible to cover the open end of the conduit 1 into which the cable 2 is inserted and to hold the cable 2 while covering the open end. In particular, the divided body 11
Are combined with each other to form a cylindrical main body 7. The cylindrical main body 7 has a flange 8 opposed to the open end of the conduit 1, and a large diameter inserted into the conduit through the opening of the conduit 1. A tubular portion 9 and a small-diameter tubular portion 10 surrounding the cable 2 outside the conduit 1 are provided, and the small-diameter divided pieces 10a constituting the small-diameter tubular portion 10 are fastened to each other in the radially-reducing direction by the connecting means 19. By holding the cable 2
When the connecting means 19 is fastened, the large-diameter divided piece 9a constituting the large-diameter cylindrical portion 9 is expanded so that the large-diameter cylindrical portion 9 is pressed against the inner peripheral surface of the pipeline 1. 1, the large-diameter cylindrical portion 9 is strongly fixed to the inside of the pipe 1 while the work is easily performed from outside the
Can be held by the small-diameter cylindrical portion 10.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in an assembled state.

FIG. 2 is a perspective view showing an embodiment of the present invention in an exploded state.

FIG. 3 is a cross-sectional view showing a state where a conduit is closed and a cable is held according to an embodiment of the present invention.

FIG. 4 shows the operation of the present invention in a use state,
(A) is an explanatory view showing the state before fastening from the bottom, and (B) is an explanatory view showing the state after fastening from the bottom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 2 Cable 7 Cylindrical main body 8 Flange 8a Flange division piece 9 Large diameter cylinder part 9a Large diameter division piece 10 Small diameter cylinder part 10a Small diameter division piece 11 Split body 12 Bracket 13 Hole 14 Tapered surface 15 Elastic rim 16 Center seal Piece 17 peripheral seal piece 19 connecting means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 9/06 F16B 2/06 F16L 5/02

Claims (4)

(57) [Claims] An apparatus for covering an open end of a conduit 1 through which a cable 2 is inserted and holding the cable, and a flange 8 opposed to the open end of the conduit 1, a conduit 1 And a small-diameter tubular portion 10 surrounding the cable 2 outside the conduit 1 and comprising a large-diameter tubular portion 9 inserted into the road from the opening of the tubular body 1. In each of the divided bodies 11 formed by dividing in the circumferential direction, a flange divided piece 8a that divides the flange, a large-diameter divided piece 9a that divides the large-diameter cylindrical part, and the small-diameter cylindrical part are divided. The small-diameter divided piece 10a constituting the small-diameter cylindrical portion 10 is fastened to each other in the diameter-reducing direction by the connecting means 19, so that the side edge 8e of the flange divided piece 10a is used as a fulcrum p. , Small-diameter split piece 10a At the same time, the large-diameter split piece 9a is expanded, and the cable 2 is held by the reduced-diameter small-diameter tube portion 10 so that the expanded large-diameter tube portion 9 is pressed against the inner peripheral surface of the pipeline 1. A closed holding device for a cable conduit, characterized in that the device is configured as follows. 2. The small-diameter divided piece 10a is provided with brackets 12 adjacent to each other, and the connecting means 19 is constituted by bolts and nuts 18 for fastening the adjacent brackets 12 to each other. 5. A closure holding device for a cable conduit according to claim 1. 3. An elastic rim 15 is provided at a free end of a large-diameter split piece 9a constituting a cylindrical edge of the large-diameter cylindrical portion 9, and the elastic rim 15 is pressed against the inner peripheral surface of the pipeline 1. The closure holding device for a cable conduit according to claim 1, characterized in that the device comprises: 4. In a configuration in which a triplex cable 2 in which three cables 2a are bundled is inserted through a conduit 1, at least a portion facing a small-diameter cylindrical portion 10 is provided.
The center seal piece 16 formed in a substantially triangular cross section is loaded into the center space surrounded by the three cables, and the space between the adjacent peripheral surfaces of the three cables and the inner peripheral surface of the small-diameter cylindrical portion is set. 4. A cable conduit closing and holding device according to claim 1, wherein a peripheral seal piece 17 having a substantially fan-shaped cross section is loaded in the space.