JP3168698U - Handhole cable support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach a cable insertion tube to a main body of a hand hole, no skill is required, it is possible to pull in a cable in a short time, and it is excellent in waterproofness, so that a short-circuit accident of a cable occurs. Provided is a cable support structure for a hand hole that can reliably prevent rust and corrosion. SOLUTION: A cable insertion tube 8 is screwed into an insertion hole formed in a wall portion 3 of a hand hole main body 1 from the outer surface side to insert the hand hole. The cable mouse 9 is screwed from the inner surface side of the wall portion 3 to the tip side of the cable insertion tube 8 so that the tip of the cable insertion tube 8 is brought into close contact with the flange 9C. The cable insertion tube 8 is inserted into the handhole main body 1 by screwing the lock tube 11 screwed into the cable insertion tube 8 and pressing the lock tube 11 together with the flange 9C of the cable mouse 9 against the wall portion 3. [Selection diagram] Fig. 5

Description

  The present invention relates to a cable support structure for a handhole installed in the ground to branch a communication or power transmission cable laid in the ground.

  When a communication or power transmission cable laid in the ground is branched in the ground, the cable is inserted into a hand hole buried in the ground and branched inside to protect it from rainwater and dust. . Therefore, it is necessary to reliably prevent rainwater penetrating into the ground from penetrating into the handhole.

Therefore, the bell mouth screw tube 2 which is screwed in advance into the connecting hard synthetic resin tube 1 and has the adhesive 4 attached to the outer periphery is inserted into the connecting hole h of the hand hole H from the outside, and the flange portion 2c is inserted into the hand hole H. The clamp screw tube 3 that is abutted against the outer side wall and has an adhesive adhered to the outer periphery is screwed into the synthetic resin tube 1 from the inside of the hand hole H, and the collar portion 3a is abutted against the inner side wall of the hand hole H and fixed. A pipe connection device in a hand hole is proposed (Patent Document 1). In addition, the wall portion is drilled with a drilling machine on site, but there are a number of drawbacks such as extremely low efficiency and poor finish.

JP 2002-118919 A

  However, in the technique shown in Patent Document 1, firstly, there are 2 gaps between the connection hole h of the handhole H and the outer periphery of the bellmouth screw 2 and the gap between the bellmouth screw 2 and the synthetic resin tube 1. There is a problem that a gap is formed between the portions, and even if the adhesives 4 and 5 are interposed, it takes time and labor to completely seal the gap. Secondly, the clamp bare tube 3 is screwed into the synthetic resin tube 1 from the inside of the hand hole H. Since a plurality of cables intersect in the hand hole H, the clamp screw 3 is screwed. There is a drawback that it is difficult to perform the work smoothly and efficiently. Thirdly, in order to rotate the clamp screw 3 and bring the bell mouth screw 2 into close contact with the wall of the hand hole H, it is necessary to apply a large torque to the clamp screw 3 in the tightening direction. The shape has the disadvantage that it is very difficult to apply torque and no other means are disclosed.

  The present invention has been made in view of the above-mentioned drawbacks and problems of the prior art, and it is easy to attach the cable insertion tube to the handhole main body, no skill is required, and the cable can be pulled in in a short time. The object is to provide a cable support structure for a handhole that is capable of reliably preventing a short-circuit accident, rusting and corrosion of a cable because it is possible and is excellent in waterproofness.

  The means of the present invention configured to solve the above-described problem is a hand hole that includes a bottom portion and a wall portion, and a cable is inserted into the wall portion. Insert a cable insertion tube with a female screw part on the inner periphery and a male screw part on the outer periphery from the outer surface side of the wall part into the fitting hole, and form a male screw part on the outer periphery and a cable mouse with a flange on the rear end side. Inserted into the insertion hole from the inner surface side of the wall portion, the male screw portion and the female screw portion of the cable insertion tube are screwed together, the tip of the cable insertion tube is brought into close contact with the flange, and screwed into the cable insertion tube. The lock tube that has been fitted is advanced so that the distal end surface of the lock tube and the flange of the cable mouse are pressed against the wall portion.

  And the insertion hole of the said handhole main body is good to form the internal thread part screwed together with the external thread part of the said cable penetration pipe | tube in the inner surface.

  The cable mouse may be provided with a waterproof packing on a contact surface with the wall portion inner surface.

Further, the lock tube may be provided with a waterproof packing on a contact surface with the outer surface of the wall portion.

  The gap between the insertion hole and the cable insertion tube may be sealed with a filler.

  The cable insertion tube may be cut into a desired length to form a sheath tube, and the cable support tube may be inserted into the sheath tube.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Insert the cable insertion tube from the outer surface side into the insertion hole formed in the wall of the hand hole body and screw the cable mouse from the inside, and screw the cable insertion tube into close contact with the flange. Since the lock pipe that is screwed is moved forward and the distal end surface of the lock pipe and the flange of the cable mouse are pressed against the wall, the cable insertion pipe can only be rotated from the outer surface side of the handhole body. Can be easily performed in a short time.
(2) Since the female threaded part where the cable insertion tube is screwed is formed on the inner surface of the insertion hole of the handhole body, the cable insertion tube will come out of the handhole body even if an external force such as an earthquake is applied, especially in the pulling direction. Can be surely prevented, and is also waterproof.
(3) The cable insertion tube, cable mouse, and lock tube can be connected to each other only by rotating and can be fastened to the handhole body, so that no skill is required and no work is required because no adhesive is used. be able to.
(4) Since the tip of the cable insertion tube is brought into close contact with the flange of the cable mouse, and the flange of the cable mouse and the tip surface of the lock tube are pressed against the handhole body, it has extremely high waterproofness.
(5) Since the cable mouse is provided with the waterproof packing on the contact surface with the inner surface of the wall portion, it is possible to reliably prevent a situation in which underground penetrating water enters the hand hole from the insertion hole.
(6) Since the lock pipe is provided with the waterproof packing on the contact surface with the outer surface of the wall, it is possible to reliably prevent the situation where the underground permeated water enters the insertion hole.
(7) Since the gap between the insertion hole and the cable insertion tube is sealed with a filler, rainwater and snowmelt water that has penetrated into the ground will enter the body of the handhole, causing cable shorting, rusting, corrosion, etc. The situation that happens can be surely prevented.
(8) The cable insertion tube is cut into a desired length to form a sheath tube, and by inserting and connecting the cable support tube to the sheath tube, the hand hole is moved up and down, front and rear, Even when there is a large fluctuation in either the left or right direction, it is possible to prevent the cable support tube from coming out of the sheath tube.

1 to 6 relate to a first embodiment of the present invention, and FIG. 1 is an exploded sectional view showing a cable support structure for a handhole. It is explanatory drawing of the state which screwed the cable penetration tube and the cable mouse from the outer side and the inner side of the handhole main body. It is a half sectional view of a lock pipe. It is explanatory drawing which inject | pours a filler into the insertion hole of a handhole main body. It is explanatory drawing of the state which attached the cable penetration pipe | tube to the handhole main body. It is explanatory drawing which inserted the several cable penetration pipe | tube in the handhole main body. 7 and 8 relate to the second embodiment, and FIG. 7 is an exploded sectional view showing a handhole cable support structure. It is explanatory drawing of the state which attached the cable penetration pipe | tube to the handhole main body. It is a fragmentary sectional view which shows the cable support structure of the handhole which concerns on 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 6 show a first embodiment. In FIG. 1, reference numeral 1 denotes a concrete handhole main body constituting a handhole. The handhole main body 1 is composed of a rectangular bottom portion 2 and four wall portions 3 to 6 that stand up from four sides of the bottom portion 2. The upper opening is molded into a bowl shape, and the upper opening is covered with a lid (not shown).

  Reference numeral 7 denotes an insertion hole made of a through hole formed in one or more wall portions 3 to 6 of the handhole body 1. The insertion hole 7 has an inner surface formed in the female screw portion 7A by providing a spiral male mold on the mold when the handhole body 1 is molded. A plurality of insertion holes 7 may be formed in each of the wall portions 3 to 6.

Reference numeral 8 denotes a synthetic resin cable insertion tube for supporting one or more communication or power transmission cables inserted into the handhole body 1. The cable insertion tube 8 is formed of a spiral groove on the inner surface. An internal thread portion 8A is formed, and an external thread portion 8B made of a spiral protrusion is formed on the outer surface. The cable insertion tube 8 having such a configuration is to be inserted and attached to the handhole body 1 from the outer surface 3A side of the wall 3.

  9 is a synthetic resin cable mouse that is screwed into the cable insertion tube 8. The cable mouse (also referred to as a bell mouth) 9 is a cylindrical portion 9 A that is inserted into the cable insertion tube 8, and the cylindrical portion. It consists of a male threaded portion 9B formed of a spiral ridge formed on the outer surface of 9A and a flange 9C formed at one base end of the cylindrical portion 9A.

Reference numeral 10 denotes an inner waterproof packing adhered to the inner surface of the flange 9C. The inner waterproof packing 10 has a flat annular shape with an insertion hole having an inner diameter that fits into the cylindrical portion 9A. Further, it is formed by appropriately selecting a soft synthetic resin material, a nonwoven fabric such as felt, and the like.

  Reference numeral 11 denotes a lock tube fitted around the cable insertion tube 8. The lock tube 11 includes a cylindrical tube main body 11A, a female threaded portion 11B formed of a spiral groove formed on the inner surface of the tube main body 11A, a slightly larger diameter than the tube main body 11A, and a circle formed at the tip of the tube main body 11A. It comprises a plate-like contact plate 11C and a plurality of finger hooking projections 11D, 11D,... Having axial lengths spaced from the contact plate 11C on the outer surface of the tube body 11A in the circumferential direction. .

  Reference numeral 12 denotes an outer waterproof packing adhered to the outer surface of the contact plate 11C. The outer waterproof packing 12 is formed in the shape of a flat plate with an opening in the center made of the same material as the inner waterproof packing 9. However, by making the thickness of the inner waterproof packing 9 approximately twice that of the inner waterproof packing 9, The penetration of rainwater from the outside of 1 is surely prevented.

  Although the present embodiment has the above-described configuration, the assembly procedure will be described next. When the handhole main body 1 is concrete-molded at a factory, a male mold having a spiral protrusion is provided on the mold, and an insertion hole 7 having a female screw portion 7A is appropriately formed in the wall portions 3 to 6. When the handhole main body 1 is installed in the ground, the cable insertion tube 8 is screwed into the insertion hole 7 from the outside of the handhole main body 1 in the direction indicated by the arrow I, and the cable mouse 9 is inserted in the direction indicated by the arrow from the inside. Then, the front end 8C of the cable insertion tube 8 is screwed together, and the front end 8C is tightly brought into close contact with the flange 9C of the cable mouse 9 via the inner waterproof packing 10 (see FIG. 2).

  Next, the cable insertion tube 8 is reversely rotated, and the inner waterproof packing 10 attached to the flange 9C of the cable mouse 9 is brought into close contact with the inner surface 3B of the wall 3. Thereafter, as shown in FIG. 4, after filling filler A into the gap between the cable insertion tube 8 and the insertion hole 7, the lock tube 11 is rotated in the advancing direction so as to contact the outer surface 3A of the wall portion 3. The outer waterproof packing 12 adhered to the contact plate 11 is brought into close contact. At this time, the lock tube 11 can be pressed against the wall portion 3 together with the cable mouse 9 by rotating the finger hook projection 11D, the finger hook projection 11D,.

Thus, the gap between the insertion hole 7 and the cable insertion tube 8 is sealed with the filler A, and the inner waterproof packing 10 is provided at the contact portion between the cable mouse 9 and the handhole body 1, and the lock tube 11 and the hand By providing an outer waterproof packing 12 at the abutting portion with the hole 1, it is possible to reliably prevent rainwater and snowmelt water from entering the handhole body 1, and to prevent damage to the cable in the handhole. Further, it is possible to prevent the occurrence of a failure of power transmission or power transmission.

  FIG. 6 shows a state where a plurality of cable insertion tubes 8 are inserted into the handhole body 1. The handhole body 1 has a plurality of insertion holes 7 formed in advance at the factory, and the insertion holes 7 that are not used for laying the cable are closed at each site by fitting and closing the lid 13 at the site. Can respond promptly to the request.

  7 and 8 show a second embodiment. In the present embodiment and other embodiments described later, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The feature of this embodiment is that the inner surface of the insertion hole 21 formed in the wall portion 3 (4 to 6) of the handhole body 1 is a flat surface 21A. By making the inner surface of the insertion hole 21 a flat surface 21A, the cable insertion tube 8 can be inserted straight without rotating, and the filler A can be filled smoothly, so that the working time can be shortened. it can. In addition, the axial tightening force by the lock tube 11 can be applied directly to the cable insertion tube 8 and the curb mouth 9.

  FIG. 9 relates to the third embodiment, and the feature thereof is that a cable insertion tube is cut to a desired length L, for example, a length of 2 to 3 m to form a sheath tube 25, and a cable having a slightly small diameter is supported. The tube 26 is inserted and connected over the entire length of the sheath tube 25. Since the sheath tube 25 is formed by cutting the cable insertion tube 8, a female screw portion 25 </ b> A made of a spiral groove is formed on the inner surface, and a male screw portion 25 </ b> B made of a spiral protrusion is formed on the outer surface.

According to this configuration, since the cable support pipe 26 is inserted and supported in the 2-3 m sheath pipe 25, there is an extra length portion, so that the handhole main body 1 is moved up and down by a large change in the ground due to an earthquake, flood, etc. Even when there is a large fluctuation in the front-rear and left-right directions, the cable support tube 26 does not come out of the sheath tube 25, so that the power transmission or communication cable can be prevented from being damaged or disconnected.

  Moreover, since the sheath tube 25 cuts the cable insertion tube into an appropriate length and is fastened to the handhole body 1 with the cable mouse 9 and the lock tube 11 as in the first embodiment, it is strong against external force. The cable support tube 26 is only inserted without being screwed into the sheath tube 25, so that it can cope with an earthquake or the like without troublesome work.

DESCRIPTION OF SYMBOLS 1 Handhole main body 3-6 Wall part 7, 21 Insertion hole 8 Cable insertion pipe 9 Cable mouse 10 Inner waterproof packing 11 Lock pipe 12 Outer waterproof packing 25 Sheath pipe 26 Cable support pipe A Filling material

Claims (6)

  In a hand hole that consists of a bottom and a wall, and a cable is inserted through the wall, a female screw part is formed on the inner periphery and a male screw part is formed on the outer periphery of the insertion hole formed in the wall part when molding the concrete of the hand hole main body. The cable insertion tube is inserted from the outer surface side of the wall portion, a male screw portion is formed on the outer periphery, and a cable mouse having a flange formed on the rear end side is inserted into the insertion hole from the inner surface side of the wall portion, A male threaded portion and a female threaded portion of the cable insertion tube are screwed together so that the tip of the cable insertion tube is in close contact with the flange, and the lock tube screwed into the cable insertion tube is advanced to advance the distal end surface of the lock tube And a handhole cable support structure in which a flange of the cable mouse is pressed against the wall portion. 2. The cable support structure for a hand hole according to claim 1, wherein the insertion hole of the hand hole main body is formed with an internal thread portion that engages with an external thread portion of the cable insertion tube on an inner surface thereof.   The cable support structure for a handhole according to claim 1, wherein the cable mouse is provided with a waterproof packing on a contact surface with the inner surface of the wall portion. The cable support structure for a handhole according to claim 1, wherein the lock pipe is provided with a waterproof packing on a contact surface with the outer surface of the wall portion.   The cable support structure for a handhole according to claim 1, wherein a gap between the insertion hole and the cable insertion tube is sealed with a filler.   The cable support structure for a handhole according to claim 1, wherein the cable insertion tube is cut into a desired length to form a sheath tube, and the cable support tube is inserted into the sheath tube.

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