JP2000320736A - Cable conduit waterproofing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the expansion and adhesion when screwing and fixing each of the outer diameter of the seal block body and the inner diameter of the insertion hole for water-sealing the inside of the cable conduit with a fixed related dimension, Moreover, it is possible to sufficiently cope with only a combination of basic parts. SOLUTION: A fan-shaped split tightening plate 10 divided into a plurality of parts is arranged on both front and rear sides of an elastic seal block body 1 inserted and arranged in a cable conduit P, and the split tighteners arranged before and after this. The boards 10 are pressed against each other with a fastening bolt 20 and a fastening nut 21. This pressing causes the seal block body 1 to expand in the radial direction, and the outer peripheral surface of the seal block body 1 is inserted into the inner peripheral surface of the cable conduit P through the insertion hole 2.
Of the cables C are made to adhere to the outer peripheral surfaces of the cables C in a water-tight manner. The outer diameter D1 of the seal block body 1 and the inner diameter D2 of the cable conduit P are D1 = D2 ÷ (103 ± 0.
7) In addition, the inner diameter d1 of the insertion hole 2 and the outer diameter d2 of each of the cables C are set to d1 = d2 + 2 ± 1 (mm).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called CC (Cmmmunity) wire common groove for storing various communication and power cables and the like which are laid underground along a roadside zone, for example.
・ Communication ・ Compact, Ca
The present invention relates to a waterproofing device for a cable conduit suitable for waterproofing in a wiring conduit for inserting a cable in a wiring accommodation facility called a box.

[0002]

2. Description of the Related Art As a conventional waterproofing device for this type of wiring conduit, for example, a waterproof seal according to Japanese Utility Model Laid-Open No. 54-168596, a waterproofing device for a cable conduit according to Utility Model Registration No. 2513816, and the like are known. Has been proposed. In the former waterproof packing, a plurality of rubbers are provided in which a cable through-hole through which a cable to be inserted is inserted exactly is communicated with the outside through a notch provided in at least one of the cable through-holes and mutually. A body is formed, and a plurality of rubber bodies are overlapped while shifting their cutting positions. In addition, the latter waterproof device for a cable conduit includes a rubber seal block body having a cable insertion hole communicated with the outside by an open cut portion, a communication cut portion, and the like, and a cable spacer inserted into the cable insertion hole. And a center presser disposed on both sides of the seal block body, and a divided outer peripheral tightening plate disposed on both sides of the central presser, and inserted into the cable insertion hole while being inserted into the cable spacer. The entire cable from both sides of the divided outer circumference tightening plate is clamped and screwed into a water-sealed state.

[0003] These conventional waterproof packings,
In the case of a seal member such as a device, in order to have versatility considering that there is a slight tolerance in the outer diameter of the cable to be inserted, the diameter of the insertion hole of the seal member which is the cable insertion portion is changed. Set a certain amount of play allowance,
The pressing force of the screwing action tightened after the insertion allows the watertight packing body and the seal block body to be brought into close contact with the outer periphery of the cable by radial expansion along the radial direction.

[0004]

However, in such a conventional watertight packing and device, the sealing members such as the watertight packing main body and the seal block itself due to the screwing action are insufficiently or uniformly expanded. Otherwise, the cable does not expand and adhere to the outer peripheral surface of the cable, and a watertight seal cannot be obtained due to the capillary phenomenon of water to enter. Moreover, since this kind of waterproofing work is mainly performed directly on site, the above-mentioned conventional work is troublesome due to the large number of parts, and the work at the site is troublesome and the handling is inconvenient. The work efficiency was significantly impaired.

Accordingly, the present invention has been made in view of the above-mentioned circumstances that have existed in the past, and has an outer diameter of a cable to be inserted and a seal member for inserting the cable, which have not been considered so far. By reviewing the relationship with the inner diameter of the insertion hole, etc., expansion, expansion at the time of screwing and pressing,
Adhesion can be improved, and the combination of basic components alone can sufficiently cope. As a result,
It is an object of the present invention to provide a waterproofing device for a cable conduit that can reduce the number of parts, facilitate handling, and significantly improve work efficiency on site.

[0006]

In order to solve the above-mentioned problem, according to the present invention, the cables C are water-sealed in a sealing block 1 made of an elastic material inserted and arranged in a cable conduit P. Cables C
A fan-shaped split tightening plate 10 divided into a plurality of parts is disposed on both front and rear sides of a seal block body 1 having an appropriate number of insertion holes 2 through which the holes are inserted. Tightening bolt 20 and tightening nut 2
1 to press the seal block 1
Are expanded in the radial direction so that the outer peripheral surface of the seal block body 1 is in close contact with the inner peripheral surface of the cable conduit P, and the inner peripheral surface of the insertion hole 2 is in close contact with the outer peripheral surface of the cables C in a watertight manner. Things. The outer diameter D1 of the seal block body 1 is D1 = D2 ÷ (103 ±) with respect to the inner diameter D2 of the cable conduit P.
0.7)% relationship, ie D1: D2 = 1: 1.03 ±
0.007, and the inner diameter d1 of the insertion hole 2 is smaller than the outer diameter d2 of each of the cables C by d.
1 = d2 + 2 ± 1 (mm). The hardness of the seal block body 1 itself can be about 25 to 35 degrees.

In the waterproof device for a cable conduit according to the present invention having the above-described structure, the cable block C is inserted and positioned in the cable conduit P in a state where the cables C are inserted into the insertion hole 2, and the seal block is provided. A tightening bolt 20 and a tightening nut 21 are provided via a split tightening plate 10 which is disposed in front and rear of the body 1.
When the seal block 1 itself is elastically pressed by, for example, the seal block 1 itself is expanded in the radial direction. At this time, the radial expansion of the seal block body 1 itself is performed by pressing the outer peripheral surface to the inner peripheral surface of the cable conduit P and the inner peripheral surface of the insertion hole 2 to the outer peripheral surface of the cables C, respectively.
In combination with the hardness formed and set on the seal block body 1, a clearance is not generated therebetween, and the seal block body 1 is pressed in a water-tight manner to realize a water-sealed state. The constant relationship between the outer diameter D1 of the seal block body 1 and the inner diameter D2 of the cable conduit P and the inner diameter d1 of the insertion hole 2 and the outer diameter d2 of each of the cables C is determined by the cable when the seal block body 1 is expanded. Sufficient adhesion is secured to the inner peripheral surface of the conduit P and the outer peripheral surface of the cables C to improve water tightness.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a seal block body installed in a predetermined cable conduit P made of, for example, a waterproof cast iron pipe. The seal block body 1 is formed in a cylindrical shape having an appropriate thickness (height) along the pipe direction of the cable conduit P. The outer diameter D1 of the seal block body 1 is For the inner diameter D2, D
1 = D2 ÷ (103 ± 0.7)%, that is, D1:
D2 = 1: 1.03 ± 0.007 (see FIG. 3). For example, when the inner diameter D2 of the cable conduit P is 105.3 mm, the outer diameter D1 of the seal block body 1 is 102 mm, and similarly, when the inner diameter D2 is 130.8 mm, the outer diameter D1 is about 127 mm, which will be described later. As described above, the clearance corresponding to the expansion allowance when the seal block body 1 itself expands in the radial direction is set. Although not shown, if necessary, a plurality of concave and convex strips are arranged in a cylindrical direction on the outer peripheral side surface of the seal block body 1 to improve the adhesion to the inner peripheral surface of the cable conduit P. You can also do so.

The seal block body 1 itself is more flexible than a conventional rubber seal member of this type having a hardness of about 40 degrees, for example, about 25 degrees.
It is formed of chloroprene rubber (CR) having a hardness of about 35 degrees, preferably about 25 degrees. For example, when the seal block body 1 itself is given a compressive force from the front-rear direction, that is, a compressive force along the pipe direction of the cable conduit P, the entire length of the seal block body 1 is reduced without reducing only the compressed portion. At the same time, the seal block 1 itself is allowed to expand and expand in the radial direction of the seal block 1 itself, which is a direction substantially orthogonal to the direction of the compression force.

Further, the cylindrical seal block body 1 is provided with an appropriate number of insertion holes 2 through which predetermined cables C such as an optical cable such as a power cable and a communication cable are inserted along the column direction. An open notch 3 (severing line) for connecting one insertion hole 2 to the outside of the seal block body 1, and indirectly or directly connected to this open notch 3 via the insertion hole 2 to another insertion hole 2. A connection notch 4 to be formed is formed. The seal block body 1 shown in FIGS. 1 to 3 has three insertion holes 2 having the same diameter, and is substantially Y when viewed from the front which communicates with each of the insertion holes 2 from the central position of the seal block body 1. The respective insertion holes 2 are connected to each other by a communication notch portion 4 having a character shape, and the cables C are directly inserted into each of the insertion holes 2 by forcibly opening the left and right at the position of the open notch portion 3. It can be positioned (see FIG. 1). Of course, the inside diameters of the insertion holes 2 are different from each other, the arrangement of the insertion holes 2 is not located on the same circumference, or each of the insertion holes 2 is connected by the communication notch 4. Changes are possible.

As shown in FIG. 4, the insertion hole 2 itself is formed as a single piece in the seal block body 1,
As shown in FIG. 5, it is possible to form an array by opening the seal block body 1 with four or even five or more (not shown). When one is opened as shown in FIG. 4, one open notch 3 is formed, and when opened as four as shown in FIG. The open cut portion 3 and the three connecting cut portions 4 communicating with the respective insertion holes 2 make the cut portion cross-shaped. When the number of the insertion holes 2 is five or more, the notches (3, 4) have a radial shape, but the communication notches 4 have a substantially arc shape such that the adjacent insertion holes 2 communicate with each other. It may be. In any case, when the cables C are inserted into each of the insertion holes 2, the cable C may be arbitrarily determined depending on whether the cable C is directly inserted from the outside of the seal block body 1 or once inserted through another insertion hole 2. It can be selected.

The inner diameter d1 of the insertion hole 2 substantially corresponds to the outer diameter d2 of each of the cables C to be inserted therethrough.
d2 + 2 ± 1 (mm) (see FIG. 3), which is in close contact with the outer peripheral surface of the cables C when the insertion hole 2 itself is narrowed by a compression action when the seal block body 1 itself is compressed. It is. That is, as described later, a clearance corresponding to the expansion allowance when the seal block body 1 itself expands in the radial direction is set between the inner peripheral surface of the insertion hole 2 and the outer peripheral surface of the cables C. is there.

On the front and rear sides of the seal block 1 which is the opening end of the insertion hole 2, there is provided a cylindrical outer jacket 5 which is in close contact with the outer periphery of the cables C inserted into the insertion hole 2. In addition, the outer cover 5 is also intended to improve the adhesion to each of the metal split tightening boards 10 described later. The thickness of the cylindrical wall of the outer cover 5 itself is such that the outer wall of the cable C is firmly adhered to the outer peripheral surface of the cables C during compression tightening by the split tightening plate 10, and the length of the insertion hole 2 along the insertion direction is the split tightening. It almost corresponds to the thickness of the attachment board 10 itself.

The main body of the seal block body 1 includes:
A plurality of bolt insertion holes 6 through which a clamping bolt 20 having a square root structure for compressing and reducing the seal block body 1 itself is inserted.
Are drilled along the column direction.

The seal block 1 itself is compressed and tightened by a split tightening plate 10 which is disposed before and after the seal block 1, and the split tightening plate 10 itself is fixed to the seal block 1 itself. The seal block body 1 has a diameter substantially equal to that of the seal block body 1 and is divided into an appropriate number of two or more of a circle as a front shape of the seal block body 1, and has a substantially fan shape when viewed from the front. . When the number of the insertion holes 2 is three or more, the divisional tightening plate 10 is preferably divided and formed, for example, in the same number corresponding to the number of the insertion holes 2 (FIGS. 1 to 3 and FIG. 5), a substantially semicircular fitting insertion portion 11 as viewed from the front corresponding to each of the positions of the insertion holes 2 is cut out at the straight edge of the divided fan-shaped split fastening plate 10. is there.
When the number of the insertion holes 2 is one, the divided tightening plate 10 is divided into, for example, two, and the straight edge thereof is formed, for example, in a straight line (see FIG. 4). There may be a case where the line edges that are divided from each other have an uneven shape so as to mesh with each other.

The split tightening plate 10 is compressed and tightened together with the divided tightening plate 10 from the outside of the split tightening plate 10 in correspondence with the position of the bolt insertion hole 6 in the seal block body 1. The fastening fixing hole 11 through which the attachment bolt 20 is inserted is formed. The fastening hole 11 itself is formed in a square hole corresponding to the fact that the screw root of the fastening bolt 20 is formed in a rectangular shape so as to prevent the fastening bolt 20 from rotating idly. Just seal block 1
Of the divided tightening discs 10 arranged before and after, the tightening fixing hole 11 of one of the divided tightening discs 10 may be formed as a round hole. If idling of the tightening bolt 20 is prevented when the work is performed from either one of the block bodies 1, it may be formed in the square hole.

The tightening bolt 20 is formed to be longer than the total thickness of each of the seal block body 1 and the divided tightening boards 10 abutting on the front and rear side surfaces of the seal block body 1, and the head thereof has a divided tightening bolt. It has a round head shape so as not to travel greatly outside the panel 10. The tip of the screw portion of the tightening bolt 20 projects out of either the front side or the rear side of the split tightening plate 10, and the tightening nut 21 is screwed into the projecting portion via a washer. The fastening nut 21 itself is formed in a so-called long nut shape in consideration of the ease of the fastening operation.

Next, an example of the use of this will be described. Each of the cables C inserted or to be inserted into the cable conduit P is placed at a predetermined position through the opened cut 3 and the connecting cut 4 respectively. Is positioned in each of the insertion holes 2. Next, the seal block 1 on the side to be inserted into the cable conduit P
A tightening bolt 20 having a square root structure is inserted from the side of the divided tightening plate 10 which is in close contact with the side surface, and is inserted from the fastening hole 11 of the divided tightening plate 10 which is in close contact with the side surface of the seal block body 1 on the opposite side. The tip of the tightening bolt 20 is moved out, and the tightening nut 21 is temporarily screwed. In this way, the seal block body 1 and the like are inserted into the cable conduit P by sliding along with the cables C or to the cables C, and the whole is pushed until reaching the predetermined water stop position. Thereafter, the tightening nut 21 is screwed in again strongly, and the seal block body 1 itself is strongly pressed from both front and rear sides thereof to be in an expanded state and fixed in the cable conduit P in a stretched state.

At this time, the strong screwing of the tightening nut 21 into the tightening bolt 20 causes the entire seal block body 1 to shrink in the cylindrical direction, and the seal block body 1 itself has a diameter corresponding to this. In this way, it expands in the direction, and presses against the inner peripheral surface of the cable conduit P and the outer peripheral surface of the cables C in a watertight manner.

[0020]

Since the present invention is constructed as described above, the outer diameter of the seal block 1 with respect to the inner diameter of the cable conduit P through which the cables C are inserted and the base 1 with respect to the outer diameter of the cables C are provided. By setting the inner peripheral diameter and the like of the insertion hole 2 in a predetermined correspondence relationship, the seal block 1
Of the cable conduit P, it is possible to fix the cable at a predetermined position in the cable conduit P and to fix the cable C by pressing.

That is, the relationship between the outer diameter of the cables C to be inserted into the cable conduit P and the inner diameter of the insertion hole 2 in the seal block body 1 through which the cables C are inserted, which has not been considered so far, is reviewed. It is possible to improve the expansion and the adhesion during the insertion, screwing and press-fixing, and furthermore, the seal block body 1 and the split tightening board 1
0, it is possible to sufficiently cope with only a combination of basic parts such as the tightening bolt 20 which is a screw fixing member, the number of parts is reduced, the handling becomes easy, and the work efficiency in the field can be remarkably improved.

According to the present invention, a seal block 1 having an insertion hole 2 through which cables C are inserted is provided.
The divided tightening plates 10 abutted on both front and rear sides are screwed and pressed by the tightening bolts 20 and the tightening nuts 21 to expand the seal block body 1 in the radial direction, and the outer periphery of the seal block body 1 This is because the surface is made to adhere to the inner peripheral surface of the cable conduit P, and the inner peripheral surface of the insertion hole 2 is made to adhere to the outer peripheral surface of the cables C in a watertight manner, thereby forming and setting the seal block body 1 itself. Together with the hardness, the clearance does not occur on the outer periphery of the seal block body 1, the inner periphery of the insertion hole 2, and the like, so that a watertight watertight state can be realized.

In particular, the outer diameter D1 of the seal block body 1 and the inner diameter D2 of the cable conduit P are D1 = D2 ÷ (103 ± 0.
7) The relation of% is set, and the inner diameter d1 of the insertion hole 2 is set.
And the outer diameter d2 of each of the cables C is d1 = d2 + 2 ± 1.
(Mm), the hardness of the seal block body 1 itself is set to about 25 to 35 degrees,
Sufficient adhesion to the inner peripheral surface of the cable conduit P and the outer peripheral surface of the cables C at the time of expansion of the seal block body 1 can be ensured, and a complicated structure for improving watertightness by a large number of members as in the related art. Is not required, and the number of parts can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same use state.

FIG. 3 is a front view of the same use state.

FIG. 4 is a front view of another embodiment.

FIG. 5 is a front view of another embodiment.

[Explanation of symbols]

C: Cables P: Cable conduit D1: Outer diameter of seal block body D2: Inner diameter of cable conduit d1: Inner diameter of insertion hole d2: Outer diameter of cables 1 ... Seal block body 2: Insertion hole 3: Open cutout 5: Connection notch 6: Bolt insertion hole 10: Split tightening board 11: Tightening fixing hole 20: Tightening bolt 21: Tightening nut

Claims (4)

[Claims] 1. A waterproofing device for a cable conduit for inserting and supporting a cable in a state where the cable is water-sealed in a seal block made of an elastic material inserted and arranged in the cable conduit, wherein a suitable number of cables for inserting the cable are provided. A fan-shaped split tightening plate divided into a plurality of pieces is disposed on both front and rear sides of a seal block body having an insertion hole formed therein. The seal block body is expanded in the radial direction by screwing and pressing with the attached nut, the outer peripheral surface of the seal block body is on the inner peripheral surface of the cable conduit, and the inner peripheral surface of the insertion hole is on the outer peripheral surface of the cables. A waterproof device for a cable conduit, wherein the waterproof device is provided in a watertight manner. 2. The outer diameter D1 of the seal block body is D1 = D2 ÷ (103 ±) with respect to the inner diameter D2 of the cable conduit.
The waterproofing device for a cable conduit according to claim 1, wherein the relationship is set to 0.7)%. 3. The waterproof device for a cable conduit according to claim 1, wherein the inner diameter d1 of the insertion hole is set to d1 = d2 + 2 ± 1 (mm) with respect to the outer diameter d2 of each of the cables. 4. The hardness of the seal block itself is about 25 to
The waterproof device for a cable conduit according to any one of claims 1 to 3, wherein the waterproof device is formed at an angle of about 35 degrees.