JP2007312458A - Watertight joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watertight joint exhibiting excellent aseismatic properties and ensuring high water tightness. <P>SOLUTION: In the watertight joint J, a tubular rubber member 3 is fitted in a cut hole 21 from a hole 20, a tubular spacer 4 is driven into the tubular rubber member 3 from the hole 20 by means of a hammer, a cable protecting tube 5 is inserted, and then a stainless band 6 is fastened thus securing the cable protecting tube 5 to the tubular rubber member 3. Consequently, the tubular rubber member 3 is secured firmly to the sidewall w and high water tightness can be ensured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a watertight joint used when a laid optical fiber, a power cable, or the like is drawn into a handhole.

A connection joint for connecting underground pipes is fixed to a through hole of a hand hole with mortar, an adhesive, or the like (Patent Document 1).
The cylindrical body that connects the underground pipe is fixed to the through hole of the hand hole with an adhesive (Patent Document 2).
Japanese Patent Laid-Open No. 10-243538 JP 2002-195460 A

The techniques of Patent Documents 1 and 2 have the following problems.
Skill is required because it is necessary to use mortar or the like to fix the connecting joint or cylindrical body to the through hole.
When vibration due to an earthquake or a vehicle is applied to the joint, the connecting joint and the mortar for fixing the tubular body to the through hole are damaged or cracked. In this case, the power cable or the like is damaged, or groundwater enters the handhole through cracks.
Since the joint has low flexibility, it cannot follow the displacement of the power cable or hand hole.
An object of the present invention is to provide a watertight joint that is excellent in earthquake resistance and can obtain high watertightness.

(About claim 1)
A watertight joint for watertightly connecting an underground pipe to a mounting hole provided in a side wall of a concrete structure is a cylinder having a small diameter portion at the tip, a flange portion at the base end, and a large diameter portion at the middle. And a rigid cylindrical spacer having a tapered portion at the distal end, a flange portion at the proximal end, and an intermediate tubular portion.

The cylindrical elastic member is fitted from the inside of the structure into the mounting hole so that the outer surface of the large diameter portion is in close contact with the mounting hole wall and the flange is locked to the inner hole corner of the mounting hole.
Next, a cylindrical spacer is driven into the cylindrical elastic member with a hammer or the like from the structure so that the cylindrical portion is press-fitted into the large-diameter portion and the flange-like portion is locked to the flange portion. Since the outer diameter of the cylindrical portion of the cylindrical spacer is slightly larger than the inner diameter of the large diameter portion of the cylindrical elastic member, when the cylindrical spacer is driven, the large diameter portion of the cylindrical elastic member expands, The elastic member and the cylindrical spacer are firmly fixed to the mounting hole.

  Then, the underground tube is inserted into the cylindrical elastic member and the cylindrical spacer so that the tip faces the structure, and the clamp placed on the outer periphery of the small-diameter portion of the cylindrical elastic member is tightened to be embedded in the ground. The tube is fixed to the cylindrical elastic member.

  Moreover, the underground pipe | tube is being fixed to the cylindrical elastic member with the fastening tool distribute | arranged to the small diameter outer periphery of the cylindrical elastic member. For this reason, high watertightness can be secured between the underground tube and the cylindrical elastic member, and between the cylindrical elastic member and the concrete structure.

Since the underground pipe is connected to the mounting hole provided in the side wall of the concrete structure via the cylindrical elastic member, the flexibility is excellent.
For this reason, even if vibrations caused by earthquakes or vehicles are applied to concrete structures and underground pipes, the watertight joint follows and deforms, preventing damage to the structures and underground pipes, Watertightness is also maintained. In addition, even if the underground pipes and structures are slightly displaced due to vibrations caused by vehicles or construction work, the watertight joint will follow and be deformed. Sex is also maintained.

  Since it is only necessary to fit the cylindrical elastic member from the inside of the structure into the mounting hole, drive the cylindrical spacer into the cylindrical elastic member, insert the underground tube and fix it to the cylindrical elastic member with the fastening tool, Construction is simple and skill is not required.

  The watertight joint can be applied regardless of the diameter of the mounting hole by selecting a cylindrical elastic member and a cylindrical spacer corresponding to the diameter of the mounting hole.

(About claim 2)
A watertight joint for watertightly connecting a cable protection tube having a circular cross section to a circular mounting hole provided on a side wall of a handhole has a small diameter portion at the distal end, a flange portion at the proximal end, and a large diameter portion at the middle. A cylindrical rubber member, and a resin-made cylindrical spacer having a tapered portion at the distal end, a flange portion at the proximal end, and an intermediate cylindrical portion.

The cylindrical rubber member is fitted from the inside of the hand hole into the mounting hole so that the outer surface of the large-diameter portion is in close contact with the mounting hole wall and the flange is locked to the inner hole corner of the mounting hole.
Next, a cylindrical spacer is driven into the cylindrical rubber member from the hand hole with a hammer or the like so that the cylindrical portion is press-fitted into the large-diameter portion and the hook-shaped portion is locked to the hook portion. Since the outer diameter of the cylindrical portion of the cylindrical spacer is slightly larger than the inner diameter of the large diameter portion of the cylindrical rubber member, when the cylindrical spacer is driven, the large diameter portion of the cylindrical rubber member expands, and the cylindrical rubber member and The cylindrical spacer is firmly fixed to the mounting hole.

  Then, the cable protection tube is inserted into the cylindrical rubber member and the cylindrical spacer so that the tip faces the hand hole, and the cable protection tube is fixed to the cylindrical rubber member by tightening the fastening tool disposed on the outer periphery of the small diameter portion of the cylindrical rubber member. To fix.

  Further, the cable protective tube is fixed to the cylindrical rubber member by a fastener disposed on the outer periphery of the small diameter portion of the cylindrical rubber member. For this reason, high watertightness can be ensured between the cable protection tube and the cylindrical spacer and between the cylindrical rubber member and the hand hole.

Since the cable protection tube is connected to the mounting hole provided on the side wall of the hand hole via the cylindrical rubber member, the flexibility is excellent.
For this reason, even if vibration due to an earthquake or a vehicle is applied to the handhole or cable protection pipe, the watertight joint follows and deforms, so that the handhole and cable protection pipe can be prevented from being damaged, and the watertightness is also maintained. It is. In addition, even if the position of the cable protection tube or hand hole is slightly shifted due to vibration from the vehicle or construction work, the watertight joint will follow and deform, so that the cable protection tube etc. can be prevented from being damaged and watertight. Kept.

  Simply insert the cylindrical rubber member into the mounting hole from inside the hand hole, drive the cylindrical spacer into the cylindrical rubber member, insert the cable protection tube, and fix it to the cylindrical rubber member with a fastener, making construction easy Does not require skill.

  The watertight joint can be applied regardless of the diameter of the mounting hole by selecting a cylindrical rubber member and a cylindrical spacer corresponding to the diameter of the mounting hole.

(Claim 3)
Before the cylindrical rubber member is fitted into the mounting hole from within the hand hole, a plate-like rubber is provided around the outer surface of the large-diameter portion of the cylindrical elastic member.
When the cylindrical rubber member is fitted into the mounting hole, the plate-like rubber and the cylindrical rubber member are firmly pressed together, so that high water tightness and flexibility can be ensured between the cylindrical rubber member and the hand hole.

(About claim 4)
The cylindrical rubber member has a gradually decreasing diameter portion whose inner and outer diameters are continuously reduced between the large diameter portion and the small diameter portion.
If the inner and outer diameters of the cylindrical rubber member are equal in diameter to the inner and outer diameters of the small diameter portion, the cylindrical rubber member will not expand sufficiently even if the cylindrical spacer is driven into the cylindrical rubber member, and the cylindrical rubber member and hand hole High watertightness cannot be obtained.
Further, when the inner and outer diameters of the cylindrical rubber member have the same diameter structure as the inner and outer diameters of the large diameter portion, the cylindrical rubber member does not sufficiently reduce the diameter even when the fastener is tightened, and the inserted cable protection tube and cylinder High watertightness cannot be obtained with the rubber member.
Due to the presence of the gradually decreasing diameter portion, high water tightness can be secured between the cable protection tube and the small diameter portion of the cylindrical rubber member and between the large diameter portion of the cylindrical rubber member and the hand hole.

  Since the tapered portion of the cylindrical spacer has a tapered surface whose outer diameter continuously decreases, when the cylindrical spacer is driven into the cylindrical rubber member, the tapered surface can smoothly slide into the inner surface of the large-diameter portion. So you can easily drive in. Since the outer diameter of the cylindrical portion of the cylindrical spacer is slightly larger than the inner diameter of the larger diameter portion of the cylindrical rubber member, the larger diameter portion of the cylindrical rubber member is expanded when the cylindrical spacer is driven.

(Claim 5)
Since the inner diameter of the tapered portion of the cylindrical spacer is larger than the inner diameter of the cylindrical portion, when inserting the cable protection tube into the cylindrical rubber member and the cylindrical spacer so that the tip faces the hand hole, the taper is tapered. The cable protection tube is not easily caught on the inner wall of the shaped part. Therefore, the cable protection tube can be easily inserted into the cylindrical rubber member and the cylindrical spacer.

(About claim 6)
The cable protective tube is formed on the tube wall in a spiral shape in which convex portions that bulge in a convex shape and concave concave portions are alternately positioned with respect to the axial direction of the tube. A rubber packing is fitted in the concave portion of the cable protection tube facing the small diameter portion of the cylindrical rubber member. A fastener is attached to the outer periphery of the small diameter portion of the cylindrical rubber member.
Water can be stopped by tightening the fastener.

A watertight joint for watertightly connecting a cable protection tube to a drilling hole includes a cylindrical rubber member and a cylindrical spacer (made of resin).
A cylindrical rubber member is fitted into the drilling hole from the hand hole, and a cylindrical spacer is driven into the cylindrical rubber member with a hammer or the like. Next, the cable protection tube is inserted into the cylindrical spacer, and the cable protection tube is fixed to the cylindrical rubber member by tightening a fastening tool disposed on the outer periphery of the small diameter portion of the cylindrical rubber member.

  Since the cylindrical spacer is driven into the cylindrical rubber member, the large diameter portion of the cylindrical rubber member expands, and the cylindrical rubber member is firmly pressure-bonded to the drilling surface. Further, the cable protective tube is fixed to the cylindrical rubber member by a fastener disposed on the outer periphery of the small diameter portion of the cylindrical rubber member. For this reason, high watertightness can be ensured between the cable protection tube and the cylindrical spacer and between the cylindrical rubber member and the drilled surface.

A first embodiment (corresponding to claims 1 to 4) of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the connection structure A between the handhole and the cable protection tube includes a cylindrical rubber member 3 fitted into a drilled hole 21 (circular cross section; φ95) formed in the side wall w of the handhole 2, and the cylindrical rubber member 3. A cable protection tube 5 inserted into a watertight joint J composed of a cylindrical spacer 4 to be driven therein is fixed by a stainless steel band 6 disposed on the outer periphery of a small diameter portion 31 of the cylindrical rubber member 3.

Reference numeral 1 denotes butyl rubber, which is attached to the outer periphery of the large diameter portion 33 of the cylindrical rubber member 3 using an adhesive.
The concrete hand hole 2 has a hole 21 (circular cross section; φ95) in a hole wall (wall thickness 35 mm).

  A hand hole 2 (concrete) embedded in the ground and having an outer shape of a quadrangular prism and a circular cross section of the hole 20 is used for drawing an optical fiber or a power line into the hole 20, and a plurality of holes are formed in the side wall w. 21 is opened. Note that the outer shape of the handhole 2 may be a cylinder other than the quadrangular prism.

  The cylindrical rubber member 3 is located between a small-diameter portion 31 at the distal end having a recess 30 around the outer periphery, a flange portion 32 at the proximal end, a large-diameter portion 33, and a large-diameter portion 33-small-diameter portion 31. The outer diameter of the large-diameter portion 33 is in close contact with the inner peripheral surface of the butyl rubber 1, and the flange portion 32 is locked to the drilling angle on the hole 20 side. Is done. The cylindrical rubber member 3 is fitted into the hole 21 from the inside of the hole 20 (see FIG. 2A).

The cylindrical spacer 4 made of resin has a tapered surface 40 whose outer diameter continuously decreases, a tapered portion 41 located on the distal end side, a flange-like portion 42 located on the proximal end side, and an outer diameter (D + α) has a cylindrical portion 43 located in the middle of the large-diameter portion 33 that is slightly larger than the inner diameter (D).
The cylindrical spacer 4 is inserted into the cylindrical rubber member 3 from the hole 20 by the hammer h so that the cylindrical portion 43 is press-fitted into the large-diameter portion 33 and the flange-shaped portion 42 is locked to the flange 32. It is driven {see FIG. 2 (b)}.

  The cable protection tube 5 formed of a flexible material is a cylindrical body that protects a cable 51 (such as an optical fiber or a power line) inserted through the tube. The cable protection tube 5 is formed with a convex portion that rises in a convex shape and a concave portion that is concave in a spiral shape alternately positioned with respect to the axial direction of the tube. A rubber packing 52 is fitted in the concave portion of the cable protection tube 5 facing the small diameter portion 31 of the cylindrical rubber member 3.

  The cable protection tube 5 is inserted into the cylindrical rubber member 3 and the cylindrical spacer 4 from the outside of the hole 20 so that the tip thereof faces the hole 20 and is cylindrically formed by the stainless steel band 6 disposed in the concave portion 30 of the small diameter portion 31. It is fixed to the small diameter portion 31 of the rubber member 3 {see (a, b) in FIG. 2}.

Below, the construction procedure of the connection structure A of the handhole and the cable protection tube using the watertight joint J will be described.
(1) The cylindrical rubber member 3 is fitted into the hole 21 from the inside of the hole 20 {see (a) in FIG. 2}. The outer surface of the large-diameter portion 33 faces the inner peripheral surface of the butyl rubber 1, and the flange portion 32 is locked to the hole angle on the hole 20 side.

(2) Using the hammer h, the cylindrical spacer 4 is driven into the cylindrical rubber member 3 from the hole 20 and the hook-like portion 42 is locked to the hook portion 32 (see FIG. 2B).
Since the outer diameter of the cylindrical portion 43 of the cylindrical spacer 4 is slightly larger than the inner diameter of the large-diameter portion 33 of the cylindrical rubber member 3, when the cylindrical spacer 4 is driven, the outer circumference of the cylindrical rubber member 3 expands, and the butyl rubber 1 Since the cylindrical rubber member 3 and the cylindrical rubber member 3 are firmly pressure-bonded, high water tightness and flexibility can be secured between the cylindrical rubber member 3 and the hand hole 2.

(3) Inside the cylindrical rubber member 3 and the cylindrical spacer 4 from the outside of the hole 20 such that the loosened stainless steel band 6 is arranged in the recess 30 and the tip of the cable protection tube 5 packed with the rubber packing 52 faces the hole 20. {See FIG. 3 (a)}.

(4) The stainless steel band 6 disposed in the recess 30 is tightened {see FIG. 3B} to fix the cable protection tube 5 to the small diameter portion 31 of the cylindrical rubber member 3 (see FIG. 1).

The connection structure A and the watertight joint J between the handhole and the cable protection tube of Example 1 have the following advantages.
[A] If the cylindrical spacer 4 is driven with a hammer h into the cylindrical rubber member 3 with the outer periphery of the large-diameter portion 33 bonded to the outer periphery of the large-diameter portion 33 to expand the large-diameter portion 33, the hole wall of the hole 21 is formed. The cylindrical rubber member 3 is firmly crimped. Further, the cable protection tube 5 fitted with the rubber packing 52 is fixed to the cylindrical rubber member 3 by the stainless steel band 6 disposed in the concave portion 30 of the small diameter portion 31 of the cylindrical rubber member 3.
For this reason, high watertightness can be secured between the cable protection tube 5 and the cylindrical spacer 4 and between the cylindrical rubber member 3 and the drilled wall of the drilled hole 21 of the handhole 2.

[I] Since the cable protection tube 5 is connected to the hole 21 provided on the side wall of the hand hole 2 through the cylindrical rubber member 3, the flexibility is excellent.
For this reason, even if vibration due to an earthquake or a vehicle is applied to the handhole 2 or the cable protection tube 5, the watertight joint J follows and deforms, so that the handhole 2 or the cable protection tube 5 can be prevented from being damaged, Watertightness is also maintained.
In addition, even if the position of the cable protection tube 5 or the hand hole 2 is slightly shifted due to vibration caused by a vehicle or construction work, the watertight joint J follows and deforms, so that the cable protection tube 5 can be prevented from being damaged. Watertightness is also maintained.

[U] The cylindrical rubber member 3 is fitted into the drilling hole 21 from the hand hole 2, the cylindrical spacer 4 is driven into the cylindrical rubber member 3 with a hammer h, and the cable protection tube 5 is inserted into the watertight joint J to form a stainless steel band. Since it is only necessary to fix to the cylindrical rubber member 3 at 6, the construction is simple and skill is not required.

[E] The watertight joint J can be applied regardless of the diameter of the hole 21 by selecting the cylindrical rubber member 3 and the cylindrical spacer 4 corresponding to the diameter of the hole 21 of the hand hole 2. .

[O] The cylindrical rubber member 3 has a gradually decreasing diameter portion 34 between the large diameter portion 33 and the small diameter portion 31 in which the inner and outer diameters continuously decrease. Due to the existence of the gradually decreasing diameter portion 34, the cylindrical spacer 4 effectively functions to expand the large diameter portion 33 and the stainless steel band 6 efficiently tightens the small diameter portion 31. Therefore, the large diameter portion of the cylindrical rubber member 3 can be obtained. High watertightness can be ensured between 33 and the hand hole 2 and between the cable protection tube 5 and the small diameter portion 31 of the cylindrical rubber member 3.

[Ka] Since the tapered portion 41 of the cylindrical spacer 4 has a tapered surface 40 whose outer diameter continuously decreases, the tapered surface 40 has a large diameter when the cylindrical spacer 4 is driven into the cylindrical rubber member 3. Since the inner surface of the portion 33 is smoothly slid and fitted, it can be easily driven with the hammer h.

The present invention includes the following embodiments in addition to the above embodiments.
a. Instead of the cable protection tube 5, a receiving port 7 (made of resin) for connecting the outlet with one touch may be attached to the watertight joint J (see FIG. 4).

b. As shown in FIGS. 5 and 6, a cylindrical spacer 4 in which the inner diameter of the tapered portion 41 is larger than the inner diameter of the cylindrical portion 43 may be adopted (corresponding to claim 5).
As shown in FIGS. 6A and 6B, when the cable protection tube 5 is inserted into the cylindrical rubber member 3 and the cylindrical spacer 4 so that the tip faces the hole 20, The cable protection tube 5 is not easily caught on the inner wall. For this reason, the cable protection tube 5 can be easily inserted into the cylindrical rubber member 3 and the cylindrical spacer 4.

c. The fastener may be a wire, a wire, a vinyl string, or a wire other than the stainless steel band.

d. Before fitting the cylindrical rubber member 3 into the drilling hole 21 from the hand hole 2, it is not always necessary to place the butyl rubber 1 on the outer periphery of the large diameter portion 33, but high water tightness is ensured. In order to do so, it is preferable to provide a circumference.

It is sectional drawing of the connection structure of a handhole and a cable protective tube using a watertight joint. (A) is explanatory drawing which shows the place which inserts a cylindrical rubber member from the inside of a hole into a drilling hole, (b) is explanatory drawing which shows the place which drives a cylindrical spacer in a cylindrical rubber member with a hammer from the inside of a hole. (A) is explanatory drawing which shows the place which fits a cable protective tube in a watertight joint, (b) is explanatory drawing which shows the place which fitted the cable protective tube. It is sectional drawing of the connection structure of a handhole and a cable protection pipe which attached to the watertight joint the receptacle for connecting an opening by one touch instead of a cable protection pipe. (A) is explanatory drawing which shows the place which inserts a cylindrical rubber member from the inside of a hole into a drilling hole, (b) It is explanatory drawing which shows the place where the cylindrical spacer which concerns on a modification is driven into a cylindrical rubber member from the inside with a hammer. is there. (A) is explanatory drawing which shows the place which fits a cable protection tube in the watertight joint which concerns on a modification, (b) is explanatory drawing which shows the place which fitted the cable protection tube.

Explanation of symbols

1 Butyl rubber (plate rubber)
2 Handhole (structure)
3 Cylindrical rubber member (cylindrical elastic member)
4 Cylindrical spacer (cylindrical spacer)
5 Cable protection pipe (underground pipe)
6 Stainless steel band (clamp)
7 Receptacle (cable protection pipe, underground pipe)
20 holes (inside the structure)
21 Drilling holes (mounting holes)
31 Small-diameter portion 32 Ridge portion 33 Large-diameter portion 34 Gradually decreasing-diameter portion 40 Tapered surface 41 Taper-shaped portion 42 Gutter-shaped portion 43 Cylindrical portion (tubular portion)
A Connection structure between hand hole and cable protection tube J Watertight joint w Side wall

Claims (6)

A watertight joint for watertightly connecting a buried underground pipe to a mounting hole provided in a side wall of a concrete structure,
A structure having a small diameter portion at the tip, a flange portion at the base end, and a large diameter portion in the middle, the outer surface of the large diameter portion is in close contact with the mounting hole wall, and the flange portion is locked to the inner hole angle. A cylindrical elastic member fitted from the inside;
A tapered portion at the distal end, a flange portion at the proximal end, and an intermediate tubular portion whose outer diameter is slightly larger than the inner diameter of the large-diameter portion, and the tubular portion is press-fitted into the large-diameter portion; A hard cylindrical spacer that is driven into the cylindrical elastic member from within the structure so that the portion is locked to the flange,
The underground tube is inserted into the cylindrical elastic member and the cylindrical spacer so that the front end faces the structure, and the underground is inserted by a fastening tool disposed on the outer periphery of the small-diameter portion of the cylindrical elastic member. A watertight joint, wherein an embedded pipe is fixed to the cylindrical elastic member. A watertight joint for watertightly connecting a cable protection tube having a circular cross section to a circular mounting hole provided on the side wall of the handhole,
A hand hole with a small diameter at the tip, a flange at the base end, and a large diameter at the middle, with the outer surface of the large diameter in close contact with the mounting hole wall and the hook being locked to the inner hole corner. A cylindrical rubber member fitted from inside,
A tapered portion at the distal end, a flange portion at the proximal end, and an intermediate cylindrical portion whose outer diameter is slightly larger than the inner diameter of the large-diameter portion, and the cylindrical portion is press-fitted into the large-diameter portion; A resin-made cylindrical spacer that is driven into the cylindrical rubber member from the hand hole so that the portion is locked to the collar portion,
The cable protection tube is inserted into the cylindrical rubber member and the cylindrical spacer so that the tip faces the hand hole, and the cable protection tube is connected to the cylinder by a fastening tool disposed on the outer periphery of the small diameter portion of the cylindrical rubber member. A watertight joint that is fixed to a rubber member.   3. A plate-like rubber is provided around the outer surface of the large-diameter portion of the cylindrical elastic member before the cylindrical rubber member is fitted into the mounting hole from within the hand hole. 3. The watertight joint according to 3. The cylindrical rubber member has a gradually decreasing diameter portion whose inner and outer diameters are continuously reduced between the large diameter portion and the small diameter portion,
4. The watertight joint according to claim 2, wherein the tapered portion of the cylindrical spacer has a tapered surface whose outer diameter is continuously reduced. 5.   The watertight joint according to claim 4, wherein an inner diameter of the tapered portion of the cylindrical spacer is larger than an inner diameter of the cylindrical portion. The cable protection tube is formed on the tube wall in a spiral shape with convex portions that bulge in a convex shape and recessed concave portions that are alternately positioned with respect to the tube axis direction.
A rubber packing is fitted into the concave portion of the cable protection tube facing the small diameter portion of the cylindrical rubber member,
The watertight joint according to any one of claims 1 to 5, wherein a fastener is attached to an outer periphery of the small diameter portion of the cylindrical rubber member.

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