JP6620216B1 - Closure and method of making the closure - Google Patents

Abstract

An object of the present invention is to provide a closure in which gas leakage and water infiltration hardly occur. An air-tight member or a water-tight member applied to at least a part of a joint surface between components constituting a closure, the air-tight member or the water-tight member being a first layer in contact with the closure and a second layer in contact with the atmosphere The first hermetic or water-tight material having a layer and applied when forming the first layer is harder than the second hermetic or water-tight material applied when forming the second layer The second air-tight or water-tight material applied when forming the second layer has a low viscosity before and has elasticity after curing. [Selection diagram] Fig. 1

Description

  The present invention relates to a technology for a closure for storing a connection portion of a metal cable.

  The connection part of the underground metal cable for communication arranged in the underground facility is protected by being enclosed by a highly airtight closure. In addition, by supplying gas (dry air) from the communication building to the underground metal cable and closure, the internal pressure is increased to prevent water from entering the closure even when the manhole or pipeline is submerged.

  For maintenance of underground metal cables, a pressure transmitter is installed in the closure to monitor the gas pressure. If a gas leak is detected, go to a place where a gas leak is suspected and repair the gas leak.

JP-A-7-107652

  Gas leaks frequently from closures due to aging and poor construction of underground metal cable networks. If the internal pressure of the underground metal cable and closure decreases due to gas leakage, water will infiltrate from the leakage point, resulting in poor insulation and communication interruption. When a gas leak is detected, it is necessary to go to the site to repair the closure, resulting in an emergency operation of the worker. In the future, in order to promote the leveling of maintenance operations, it is desirable to take preventive maintenance measures, focusing on closures with a high risk of gas leakage.

  The present invention has been made in view of the above, and an object of the present invention is to provide a closure that is less likely to cause gas leakage and a closure that is less likely to be submerged even when the internal pressure of the closure is reduced.

  A closure according to the present invention is a closure that accommodates a connecting portion of a metal cable, and includes an airtight member or a watertight member applied to a joint surface between components constituting the closure, and the airtight member or the watertight member includes: A first layer in contact with the closure and a second layer in contact with the atmosphere; the first material used for the first layer has a lower viscosity before curing than the second material used for the second layer; Is characterized by having elasticity after curing than the first material after curing.

  A method for manufacturing a closure according to the present invention is a method for manufacturing a closure for storing a connection part of a metal cable, and after assembling the parts constituting the closure and storing the connection part of the metal cable, It has the process of apply | coating an airtight member or a watertight member with respect to a joining surface.

  According to the present invention, it is possible to provide a closure that is less likely to cause gas leakage and a closure that is less likely to be submerged even when the internal pressure of the closure is reduced.

It is a perspective view which shows the structure of the closure of this embodiment. It is a top view which shows the structure of an end surface board. It is a flowchart which shows the process of apply | coating an airtight member or a watertight member to a closure. It is a figure which shows a mode that a 1st airtight material or a watertight material is apply | coated to an end surface board. It is a figure which shows a mode that a 2nd airtight material or a watertight material is apply | coated to an end surface board. It is a figure which shows the mode of the end surface board after an airtight member or a watertight member application.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of a closure according to the present embodiment, and FIG. 2 is a plan view showing a configuration of an end face plate to which a cable is connected.

  The closure accommodates a connection portion between the communication cable C1 and the cable C2, and is disposed, for example, in an underground facility. Gas is supplied from the communication building into the cable C1, and the closure is filled with gas. The closure is completely sealed so that gas does not leak out. Gas is also supplied from the closure to the downstream side via the cable C2.

  The closure shown in FIGS. 1 and 2 includes a cylindrical sleeve body 11, an end face plate 12 that holds the cables C1 and C2 at both ends of the closure, a plurality of stainless steel bands 14 that press and fix the closure from the side, and An airtight member or a watertight member 17 applied to the joint surface between the parts constituting the closure is provided.

  The sleeve body 11 is configured by combining two upper and lower semi-cylindrical sleeve bodies 11A and 11B. A sleeve gasket (not shown) is disposed at the joint between the sleeve bodies 11A and 11B. Although not shown, the sleeve main body 11 may be provided with a valve for attaching a pressure measuring device for measuring the gas pressure in the closure.

  The end face plate 12 includes an opening 12C for allowing the cables C1 and C2 to pass through, and is configured by combining two upper and lower semicircular end face plates 12A and 12B. The end face plate 12 is arbitrarily selected according to the number and size of the cables C1 and C2 to be passed. For example, when the cable is branched into two at the connection portion, an end face plate having two openings is used on the branch side.

  Cables C1 and C2 are wrapped around an air tight tape (not shown) and gripped at the opening 12C. The end face plates 12A and 12B are fixed with screws 13 while holding the cables C1 and C2. The opening 12C of the end face plate 12 includes a plurality of through-holes 12D for inserting pins 15 that prevent displacement. A plurality of through-holes 12D for inserting pins 15 at a plurality of positions are formed in the opening 12C so as to correspond to cables C1 and C2 having various diameters. In the closure of this embodiment, the pin 15 is fixed in a state where the head protrudes from the outer periphery of the opening 12C.

  The stainless steel band 14 is wound around the outer periphery of the sleeve body 11 and tightened with a screw (not shown). The stainless steel band 14 presses and fixes the outer periphery of the sleeve body 11.

  The airtight member or the watertight member 17 includes a portion for holding the cables C1 and C2 in the opening 12C, a joint between the sleeve main bodies 11A and 11B, a joint between the end face plates 12A and 12B, and the sleeve main body 11 and the end face plate 12. It is applied to the seam. In the gripping portions of the cables C1 and C2, an airtight member or a watertight member 17 is injected into the entire space in the opening 12C including the pins 15 after winding a protective vinyl tape around the cables C1 and C2. At the joint of the sleeve main bodies 11A and 11B, the frame 16 is attached to both sides of the joint to prevent the airtight member or the watertight member 17 from dripping. The frame 16 is attached between the stainless steel bands 14. 1 and 2, the airtight member or the watertight member applied to the joint between the end face plates 12A and 12B and the joint between the sleeve main body 11 and the end face plate 12 is not shown.

  The airtight member or watertight member 17 includes a thin film forming layer (first layer) in contact with the closure and a second layer formed of a reinforcing layer (second layer) in contact with the atmosphere. The material applied when forming the first layer has a lower viscosity before curing than the material applied when forming the second layer. The material to be applied when forming the second layer is a material that is more elastic after curing than the thin film forming layer after curing. By using a low-viscosity material for the first layer of the airtight member or the watertight member 17, the airtight member or the watertight member 17 can also enter the fine gap, and the airtightness can be improved. By using a material having elasticity after curing for the second layer of the airtight member or the watertight member 17, resistance to mechanical vibration of the airtight member or the watertight member 17 can be ensured. As the airtight material, for example, an epoxy resin, a hot melt, a caulking agent, or the like can be used. The airtight member or the watertight member 17 composed of the first layer and the second layer only needs to have sufficient adhesiveness to withstand the internal pressure of the closure of 63.7 kPa.

  The airtight member or the watertight member 17 is desirably applied to all the joint surfaces between the parts constituting the closure, but the airtight member or the watertight member 17 may be applied to at least a part of the joint surface. Since the cables C1 and C2 installed in the underground facilities expand and contract due to temperature changes and vibrate due to vehicle traffic on the ground road, the portion that grips the cables C1 and C2 (especially air tight tape) is degraded. However, gas often leaks from the gripping part. Therefore, it is desirable to apply the airtight member or the watertight member 17 to at least the grips of the cables C1 and C2.

  Next, the assembly of the closure and the application of the airtight member or the watertight member will be described.

  An air tight tape is wound around a place where the end plates 12 of the cables C1 and C2 are attached. The end face plates 12A and 12B are joined so that the portion around which the air tight tape is wound is held by the opening 12C, and the screw 13 is tightened to attach the end face plate 12 to each of the cables C1 and C2. After joining the end face plates 12A and 12B, end face plate gaskets are attached to the outer peripheries of the end face plates 12 respectively.

  The sleeve body 11B is attached to the lower side of the end face plate 12, the connecting portions of the cables C1 and C2 are accommodated in the sleeve body 11B, a sleeve gasket is attached to the joint of the sleeve bodies 11A and 11B, and the sleeve body 11A is attached to the sleeve body 11B. Cover.

  The stainless steel band 14 is wound around the outer periphery of the sleeve body 11, and the screw of the stainless steel band 14 is tightened.

  The closure which accommodated the connection part of cable C1, C2 can be assembled in the above process. After assembling the closure, an airtight member or a watertight member is applied to a location where gas is likely to leak.

  FIG. 3 is a flowchart showing a process of applying an airtight member or a watertight member to the closure. An airtight member or a watertight member can be applied not only to a newly assembled closure but also to a closure that has already been used. Before applying the airtight member or the watertight member, gas is sealed in the closure, and then the presence or absence of gas leakage is confirmed using a soap solution. If there is a gas leak, repair the gas leak.

  The area where the airtight member or the watertight member is applied is cleaned with a cleaning agent, and the closure is cleaned (step S1). Also remove the dirt on the pins 15 and the cables C1 and C2. Thoroughly remove soap and water.

  The cables C1, C2 and the pins 15 are cured using a curing tape such as a protective vinyl tape or silicon tape (step S2). The cables C1 and C2 are cured by about 5 cm by winding a curing tape in a half layer from the boundary between the cables C1 and C2 and the air tight tape. The pin 15 is cured by winding a curing tape around the top. As for the pin 15, the part which wound the curing tape does not enter the through hole 12D, and the head is exposed. Alternatively, the upper part of the pin 15 may be cut. The screw 13 may be cured so that the airtight member or the watertight member does not enter the hole of the screw 13.

  Subsequently, a surface modifier such as a primer or a sealer is applied to a place where an airtight member or a watertight member is applied (step S3). Since polyethylene, which is a material for the closure, is difficult to adhere to an airtight member or a watertight member, a surface modifier is applied to improve adhesion. Alternatively, the surface of the closure may be roughened with a file or the like, or the surface modifier may be applied after the surface is roughened. Moreover, you may attach the frame 16 to the both sides of the joint of sleeve main body 11A, 11B. The frame 16 is shaped to the length between the stainless steel bands 14 so as not to overlap the stainless steel band 14. After applying the surface modifier, it is dried for about 10 minutes.

  Subsequently, the first airtight material or the watertight material forming the first layer is applied to the joint surface between the parts constituting the closure (step S4). Specifically, the two liquids are mixed to prepare a first airtight material or a watertight material, and using a brush, the air tight tape T, the pin 15, the end face plate 12, the sleeve body 11, and the cables C1, C2 A first airtight material or a watertight material is applied to the substrate. The two liquids to be mixed may be preliminarily colored with different color pigments so that it can be easily confirmed that the two liquids have been sufficiently mixed. In FIG. 4, the first airtight material or the watertight material is applied to the air tight tape T, the protective vinyl tape cured with the cable C1, and the pin 15 in the opening 12C using a brush. Since the first airtight material or the watertight material forming the first layer has low viscosity before curing, the first airtight material or the watertight material is applied using a brush. In addition to the gripping portions of the cables C1 and C2 shown in FIG. 4, the first end also includes the joint between the end face plates 12A and 12B, the joint between the sleeve main bodies 11A and 11B, and the joint between the end face plate 12 and the sleeve main body 11. Apply an airtight or watertight material.

  Finally, the second airtight material or the watertight material forming the second layer is applied to the joint surface between the parts constituting the closure (step S5). Specifically, the two liquids are mixed well in the bag, and the second airtight material or watertight material is prepared. The two liquids to be mixed may be preliminarily colored with different color pigments so that it can be easily confirmed that the two liquids have been sufficiently mixed. The cone nozzle is attached to the bag, and as shown in FIG. 5, the second airtight material or the watertight material is injected in the vicinity of the air tight tape T in the opening 12C. The second airtight material or the watertight material is filled so as to fill the entire space in the opening 12C. The viscosity of the second airtight material or watertight material before curing is higher than the viscosity of the first airtight material or watertight material, for example, mayonnaise. If the filling of the second airtight material or the watertight material is insufficient, such as bubbles remaining, the effect of preventing gas leakage is reduced. It confirms from the through-hole 12D which has not inserted 15. If it can be confirmed that the second airtight material or the watertight material flows out of the through-hole 12D, the second airtight material or the watertight material is sufficiently filled. The second airtight material or the watertight material is shaped using a spatula. In addition to the gripping portions of the cables C1 and C2 shown in FIG. 5, the joints of the end face plates 12A and 12B, the frame 16 of the joints of the sleeve main bodies 11A and 11B, and the joints of the end face plate 12 and the sleeve main body 11 Also, a second airtight material or a watertight material is applied.

  FIG. 6 shows the state of the end face plate after applying the airtight member or the watertight member. A protective vinyl tape is wound around the cable C1, and the pin 15 is coated with an airtight member or a watertight member 17 with the upper portion protruding. By applying the airtight member or the watertight member 17 on the cable C1 after the protective vinyl tape is wound around, the adhesion area of the airtight member or the watertight member 17 to the cable C1 can be controlled, and the dismantling property is ensured. By popping out the head of the pin 15, when the closure is disassembled, the head of the pin 15 and the end face plate 12 do not interfere with each other, and the head of the pin 15 can be easily cut. At the time of disassembly, the screw 13 is removed, the head of the pin 15 is cut, and the end face plates 12A and 12B are divided with jacks. The airtight member or the watertight member 17 applied to the cable C1 can be removed by peeling off the protective vinyl tape wound around the cable C1.

  Through the above steps, a closure that reinforces the joint surface between components can be produced.

  Next, the dismantling of the reinforced closure will be described.

  The frame 16 is removed, the airtight member or watertight member 17 of the joint between the sleeve main bodies 11A and 11B is removed, and the airtight member or watertight member of the joint between the end face plate 12 and the sleeve main body 11 is removed. Then, the stainless steel band 14 is loosened and removed from the sleeve main body 11, and the sleeve main bodies 11A and 11B are divided. Thus, the end face plate 12 can be removed from the sleeve body 11.

  The airtight member or the watertight member at the joint of the end face plates 12A and 12B is removed. The protective vinyl tape wound around the pin 15 is removed, and the head of the pin 15 is cut. The end face plates 12A and 12B are divided by loosening the screws 13. Thus, the cables C1 and C2 can be removed from the end face plate 12.

  The protective vinyl tape wound around the cables C1 and C2 is removed, and the airtight member or the watertight member of the grip portion of the cables C1 and C2 is removed.

  Through the above steps, the reinforced closure can be disassembled.

  As described above, according to this embodiment, the airtight member or the watertight member 17 applied to at least a part of the joint surface between the components constituting the closure is provided, and the airtight member or the watertight member 17 is in contact with the closure. The first airtight material or the watertight material that is applied when forming the first layer has the second layer that is in contact with the atmosphere and the second layer that is applied when forming the second layer. The second air-tight material or water-tight material applied when forming the second layer has a lower viscosity than the water-soluble material or water-tight material, and the second air-tight material or water-tight material applied when forming the second layer has elasticity after curing, so The airtight member or the watertight member 17 also enters the gap, so that the airtightness or the watertightness can be enhanced, and the resistance to mechanical vibration of the airtight member or the watertight member 17 can be secured.

  According to this embodiment, the adhesiveness of the airtight member or the watertight member 17 to the closure can be improved by applying the surface modifier before applying the airtight member or the watertight member 17.

  According to this embodiment, the airtight member or the watertight member 17 is applied to the cables C1 and C2 by applying the airtight member or the watertight member 17 after winding the curing tape from the boundary between the cables C1 and C2 and the air tight tape. The adhesion area can be controlled to ensure dismantling. By causing the head of the pin 15 to jump out, the head of the pin 15 can be easily cut when the closure is disassembled.

11, 11A, 11B ... Sleeve body 12, 12A, 12B ... End face plate 12C ... Opening 12D ... Through hole 13 ... Screw 14 ... Stainless steel band 15 ... Pin 16 ... Frame 17 ... Airtight member or watertight member C1, C2 ... Cable T ... Air tight tape

Claims (5)

A closure for storing the connection part of the metal cable,
An airtight member or a watertight member applied to the joint surface between the parts constituting the closure,
The airtight member or the watertight member has a first layer in contact with the closure and a second layer in contact with the atmosphere,
The first material used for the first layer has a lower viscosity before curing than the second material used for the second layer,
The said 2nd material has elasticity rather than the said 1st material after hardening after hardening. The closure characterized by the above-mentioned. A method for producing a closure for storing a connection portion of a metal cable,
A method for producing a closure, comprising: assembling parts constituting the closure and storing a connection portion of the metal cable, and then applying an airtight member or a watertight member to a joint surface between the parts. The step of applying the airtight member or the watertight member has a step of applying a first material, and a step of applying a second material after applying the first material,
The first material has a lower viscosity before curing than the second material,
The said 2nd material has elasticity rather than the said 2nd material after hardening after hardening. The manufacturing method of the closure of Claim 2 characterized by the above-mentioned. Before the step of applying the airtight member or the watertight member, a step of roughening a surface to which the airtight member or the watertight member is applied and a step of applying a surface modifier to the surface to which the airtight member or the watertight member is applied. It has at least any one. The manufacturing method of the closure of Claim 2 or 3. 5. The method according to claim 2, further comprising a step of winding a curing tape around a portion of the metal cable to which the airtight member or the watertight member is applied before the step of applying the airtight member or the watertight member. A method for producing the described closure.

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