JP2008131733A - Duct port waterproofing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct port waterproofing device which enables the user to easily and quickly perform the work of laying a communication cable or the like being its essential work, without necessity of performing the attachment work, to an inner pipe, of a reinforcing member for suppressing the deformation of the inner pipe on the site. <P>SOLUTION: The duct port waterproofing device 10 is composed of a seal member 50 which is equipped with a through hole 51 for threading the inner pipe 41 to be laid in a duct 20 and is openable and transformable in its radial direction, a transforming member 60 which opens and transforms the seal member in its radial direction and presses it against the inner perimetrical face of the duct, and a plurality of pipe element pieces 71 which are segmented in the circumferential direction of the inner pipe. It has a reinforcing pipe 70 which is attached into the through hole so as to cover the inner pipe, and a filler 80 which seals the space between itself and the peripheral face of the inner pipe, being attached to the inner perimetrical face of the reinforcing pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conduit port waterproof device provided at a conduit port of a conduit where an inner pipe is laid.

  When laying more communication cables using the empty space in the pipeline where the power cable is laid, lay an inner pipe, which is a protection pipe for the communication cable, in the pipeline, and insert a communication line such as an optical cable into the inner pipe. The construction method is widely adopted. In order to prevent flowing water from the pipe line, a pipe port waterproof device is provided at the pipe port (see Patent Document 1 and Patent Document 2).

The conduit port waterproof device has a seal member that seals a space between the inner peripheral surface of the conduit and the outer peripheral surface of the inner pipe. The inner pipe penetrates the seal member. When the inner pipe is deformed, a gap is generated between the seal member and the inner pipe, and the waterproof performance is deteriorated. For this reason, Patent Document 1 describes a technique in which a reinforcing pipe is attached to an inner pipe, and a normal temperature shrinkable tube is attached so as to cover the reinforcing pipe. Patent Document 2 describes a technique in which a portion of an inner pipe that penetrates a seal member is formed from a metal tube.
Japanese Patent Laid-Open No. 10-243537 JP-A-11-346429

  In the technique described in Patent Document 1, a reinforcing pipe and a normal temperature shrinkable tube must be attached to an appropriate portion of the inner pipe that penetrates the seal member. Even in the technique described in Patent Document 2, an appropriate portion of the inner pipe that penetrates the seal member must be formed of a metal tube. That is, in any case, the reinforcement member for suppressing the deformation of the inner pipe must be attached to the inner pipe at the work site where the communication cable is laid. Thus, since it is necessary to perform the attachment work of the reinforcing member in the field, it is difficult to easily and quickly carry out the work of laying the communication cable or the like, which is the original work.

  Therefore, an object of the present invention is to eliminate the necessity of attaching the reinforcing member to the inner pipe for suppressing the deformation of the inner pipe at the site, and to easily and quickly carry out the work of laying the communication cable, which is the original work. An object of the present invention is to provide a waterproof device for a duct opening.

In order to achieve the above object, the invention according to claim 1 is provided with a seal member that has a through hole for inserting an inner pipe laid in a pipe and can be expanded and deformed in a radial direction.
A deformation member that expands and deforms the seal member in the radial direction and presses the seal member against the inner peripheral surface of the pipe;
Reinforcement pipe composed of a plurality of pipe pieces divided along the circumferential direction of the inner pipe, and attached to the through hole so as to cover the inner pipe;
It is a pipe port waterproof device having a filler attached to the inner peripheral surface of the reinforcing pipe and sealing the space between the outer peripheral surface of the inner pipe.

  According to the present invention, when the sealing member is expanded and deformed along the radial direction, the inner diameter of the through-hole is reduced, so that the reinforcing pipe reduces the space between the inner pipe. Thereby, a filler is compressed between a reinforcement pipe and an inner pipe, and the clearance gap between both is sealed.

  After the ends of the pipe pieces abut, even if the seal member continues to be deformed, the reinforcing pipe is no longer deformed, or even if deformed, the amount of deformation is small. For this reason, the force for expanding and deforming the seal member does not act on the inner pipe more than necessary, and the deformation of the inner pipe can be suppressed.

  In addition, since the reinforcing pipe is attached to the seal member, it is not necessary to perform an attaching operation to the inner pipe of the reinforcing pipe for suppressing deformation of the inner pipe in the field. Therefore, it is possible to easily and quickly perform the work of laying the communication cable or the like, which is the original work.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are a cross-sectional view and a front view showing a conduit port waterproof device 10 according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, and FIGS. (C) is a diagram for explaining the operation of the conduit port waterproof device 10. 1 indicates the axial direction of the pipe line 20 and the inner pipe 41, and the axis Y indicates the radial direction of the pipe line 20 and the inner pipe 41.

  FIGS. 1 and 2 show a configuration in which, for example, a communication cable 40 is laid using an empty space of the pipeline 20 in which the power cable 30 is laid. An inner pipe 41, which is a protective pipe for the communication cable 40, is laid on the pipeline 20, and a communication line 42 such as an optical cable is inserted into the inner pipe 41. In order to prevent running water from the pipe line 20 into the equipment room 21, the pipe port waterproof device 10 is provided at the pipe port 22.

  In summary, the pipe port waterproof device 10 includes a seal member 50 that includes a through hole 51 for inserting an inner pipe 41 laid in the pipe line 20 and that can be expanded and deformed in the radial direction, and the seal member 50 in the radial direction. And a deforming member 60 that is deformed and pressed to the inner peripheral surface of the pipe line 20 and a plurality of pipe pieces 71 divided along the circumferential direction of the inner pipe 41 so as to cover the inner pipe 41. The reinforcing pipe 70 is attached to the through hole 51, and the filler 80 is attached to the inner peripheral surface 70 of the reinforcing pipe 70 and seals the space between the outer peripheral surface of the inner pipe 41. This will be described in detail below.

  The inner pipe 41 is, for example, a protection pipe for the communication cable 40, and is formed of a relatively soft resin material, for example, a thermoplastic resin such as high-density polyethylene, PVC, PP, etc., and has a hollow cross section. The inner pipe 41 is weaker than the power cable 30 having a substantially solid cross section, and is easily deformed or crushed.

  In addition to the inner pipe through hole 51, the seal member 50 is formed with three power cable through holes 52 through which the three power cables 30 are inserted. In the sealing member 50, a plurality (five layers in FIG. 1) of rubber layers are laminated along the axial direction X. The material for forming the rubber layer is not particularly limited, and examples thereof include butadiene rubber (BR) and natural rubber (NR). As shown in FIG. 2, the seal member 50 is composed of blocks 50a, 50b, 50c, and 50d that are divided into a plurality (four in the illustrated example). An arcuate recess 53 for forming the inner pipe through-hole 51 is formed on the end face where the blocks 50b and 50c abut each other. An arcuate recess 54 for forming the power cable through hole 52 is formed on the end face where the blocks 50a and 50b are brought into contact with each other. Similarly, arc-shaped recesses 54 for forming the power cable through holes 52 are also formed on the end faces where the blocks 50c, 50d are abutted and the end faces where the blocks 50a, 50d are abutted.

  A pair of metal flanges 61 and 62 are disposed at both ends along the axial direction of each block 50a, 50b, 50c and 50d so as to sandwich each block 50a, 50b, 50c and 50d. For convenience of explanation, the flange located on the back side of the pipe line 20 (right side in FIG. 1) with the pipe port waterproof device 10 attached is referred to as a first flange 61, and is on the near side, that is, on the side of the pipe port 22 (left side in FIG. 1). ) Is called the second flange 62. A fastening bolt 63 is attached to the first flange 61 so as to extend toward the second flange 62. The fastening bolt 63 passes through the seal member 50, the bush 64 and the second flange 62, and faces the pipe port 22 side. A washer 65 is inserted through the tightening bolt 63 penetrating the second flange 62 and a nut 66 is attached. When the nut 66 is screwed, the seal member 50 is elastically compressed along the axial direction by the first flange 61 and the second flange 62, and elastically expands and deforms in the radial direction accordingly, and the pipe line 20 is pressed against the inner peripheral surface. A deformable member 60 is configured by the first flange 61, the second flange 62, the fastening bolt 63, and the nut 66.

  A sealing material 91 is applied between the outer peripheral surface of the power cable 30 and the inner peripheral surface of the power cable through hole 52 (see FIG. 1). For the seal material 91, for example, an unvulcanized rubber for sealant is used. The sealing material 91 is applied to a substantially central portion in the axial direction of the power cable through hole 52.

  The reinforcing pipe 70 is composed of a plurality of pipe pieces 71 divided along the circumferential direction of the inner pipe 41. In the example of illustration, the reinforcement pipe 70 is comprised from two half crack pipes. Referring to FIG. 3, a sealing material 92 is applied between the outer peripheral surface of the reinforcing pipe 70 and the inner peripheral surface of the inner pipe through hole 51 to seal a gap between the two. For the seal material 92, for example, an unvulcanized rubber for sealant is used. The sealing material 92 is applied to a substantially central portion of the reinforcing pipe 70 in the axial direction. The outer peripheral surface of the reinforcing pipe 70 is attached to the sealing material 92 via an adhesive. The adhesive is applied only to a substantially central portion in the axial direction of the reinforcing pipe 70, and the reinforcing pipe 70 has a shape in which the substantially central portion in the axial direction is attached to the through hole 51 for the inner pipe. Since the reinforcing pipe 70 is not attached to the inner pipe through-hole 51 over the entire length in the axial direction, the compression of the seal member 50 along the axial direction is not hindered, and the expansion and deformation are smoothly performed along the radial direction. Can be made.

  As shown in FIG. 4A, a filler 80 for sealing the space between the reinforcing pipe 70 and the inner pipe 41 is attached to the inner peripheral surface of each pipe piece 71 and the butt end 72. ing. For the filler 80, for example, unvulcanized rubber for sealant use is used.

  Between the outer peripheral surface of the seal member 50 and the inner peripheral surface of the pipe line 20, a seal material 93 for sealing a gap between the two is applied in a ring shape (see FIG. 1). Between the outer peripheral surface of the power cable 30 and the inner peripheral surface of the power cable through hole 52, a seal material 94 for sealing a gap between the two is applied in a ring shape (see FIG. 1). Similarly, a seal material 95 for sealing the gap between the outer peripheral surface of the reinforcing pipe 70 and the inner peripheral surface of the inner pipe through hole 51 is applied in a ring shape (FIG. 3). reference). For the sealing materials 93, 94, 95, for example, water-absorbing swelling resin or the like is used. Ring grooves are formed on the outer peripheral surface of the seal member 50, the inner peripheral surface of the power cable through hole 52, and the inner peripheral surface of the inner pipe through hole 51 to hold the seal members 93, 94, and 95. Yes. By providing a water-absorbing swellable resin at these locations, the waterproof performance is further enhanced.

  The operation of this embodiment will be described.

  When the conduit port waterproof device 10 is provided, the four blocks 50a, 50b, 50c, 50d constituting the seal member 50 are butted to cover the three power cables 30, and the blocks 50b, 50c are butted together. The inner pipe 41 is covered with the reinforcing pipe 70. FIGS. 4A and 4B show a state in which the inner pipe 41 is covered with the reinforcing pipe 70. Before the sealing member 50 is expanded and deformed, the filler 80 has a substantially uniform thickness (see FIG. 4B).

  The four blocks 50a, 50b, 50c, and 50d are inserted into the pipe line 20 while covering the power cable 30 and the inner pipe 41.

  A washer 65 is inserted through the fastening bolt 63 that has penetrated the second flange 62, and a nut 66 is attached. The nut 66 is screwed, and the seal member 50 is elastically compressed along the axial direction by the first flange 61 and the second flange 62 and elastically expanded and deformed in the radial direction. The outer peripheral surface of the seal member 50 is pressed against the inner peripheral surface of the pipe line 20, and the gap between the two is sealed.

  As the seal member 50 expands and deforms, the diameter of the power cable through hole 52 decreases, and the seal member 50 and the power cable 30 come into close contact with each other to seal the gap between the two. Further, as shown in FIG. 4C, the inner pipe through-hole 51 is also reduced in inner diameter, and the reinforcing pipe 70 is a space between the inner pipe 41 and the seal member 50 as it expands and deforms. Will be reduced. As a result, the filler 80 is compressed between the reinforcing pipe 70 and the inner pipe 41 to seal the gap between them.

  After the butted end portions 72 of the pipe piece 71 are in contact with each other via the filler 80, even if the elastic deformation of the sealing member 50 continues, the reinforcing pipe 70 is no longer deformed or is slightly deformed. The amount of deformation. For this reason, the force for expanding and deforming the seal member 50 does not act on the inner pipe 41 more than necessary, and the deformation of the inner pipe 41 can be suppressed.

  In addition, since the reinforcing pipe 70 is attached to the seal member 50, it is not necessary to perform the work of attaching the reinforcing pipe 70 to the inner pipe 41 for suppressing the deformation of the inner pipe 41 in the field. Therefore, it is possible to easily and quickly perform the work of laying the communication cable 40 or the like, which is the original work.

  As described above, according to the present embodiment, it is possible to prevent water flowing from the pipe line 20 into the equipment room 21 while suppressing deformation of the inner pipe 41, and to lay the communication cable 40, which is the original work. Work can be performed easily and quickly.

1 is a cross-sectional view showing a conduit port waterproof device according to an embodiment of the present invention. It is a front view which shows a pipe port waterproofing apparatus. It is sectional drawing which follows the 3-3 line of FIG. It is a figure with which it uses for description of an effect | action of a conduit opening waterproof device.

Explanation of symbols

10 conduit opening waterproofing device,
20 pipelines,
40 communication cable,
41 Inner pipe,
50 sealing member,
50a, 50b, 50c, 50d blocks,
51 Inner pipe through hole (through hole),
52 Through hole for power cable,
53 An arc-shaped recess (arc-shaped recess) for forming an inner pipe through-hole,
54 An arc-shaped recess for forming a power cable through hole;
60 deformation members,
61 first flange,
62 second flange,
63 Tightening bolt,
66 nuts,
70 reinforcement pipes,
71 pipe piece,
72 butt end,
80 Filler.

Claims (3)

A seal member (50) provided with a through hole (51) for inserting an inner pipe (41) laid in the pipe line (20) and capable of expanding and deforming in the radial direction;
A deformation member (60) that expands and deforms the seal member (50) in the radial direction and presses the seal member (50) against the inner peripheral surface of the pipe line (20);
Reinforcing pipe composed of a plurality of pipe pieces (71) divided along the circumferential direction of the inner pipe (41) and attached to the through hole (51) so as to cover the inner pipe (41) (70),
A pipe port waterproof device comprising: a filler (80) attached to an inner peripheral surface of the reinforcing pipe (70) and sealing a space between the inner pipe (41) and the outer peripheral surface.   The seal member (50) is composed of blocks (50a, 50b, 50c, 50d) divided into a plurality of parts, and the through hole (51) is formed on the end face where the blocks (50b, 50c) are abutted. The conduit opening waterproof device according to claim 1, wherein an arcuate recess (53) is formed.   The pipe port waterproof device according to claim 1, wherein the inner pipe (41) is a protective pipe of a communication cable (40).

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