JP2015177592A - Sealing structure and method for manufacturing sealing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel structure which allows a sealed part to keep its sealing performance even if the sealed part expands or shrinks.SOLUTION: A sealing structure comprises: a packing for covering the periphery of a cable with its tegument removed, which can form the sealed part where the tegument is removed, by hardening a resin filled in an internal space; and a case main body for sealing the internal space by pressing the packing. The case main body has an elastic member. The deformation of the sealed part is absorbed by elastic deformation of the elastic member.

Description

  The present invention relates to a sealing structure and a manufacturing method of the sealing structure.

A technique is known in which the periphery of a portion of the cable from which the jacket has been removed (the jacket removal portion) is sealed with resin. For example, in Patent Document 1, in order to protect the outer cover removal portion, the outer periphery of the outer cover removal portion is covered with an enclosure, filled with resin inside the outer envelope, and cured, and the outer periphery of the outer cover removal portion is cured with resin. The technique of sealing with is described. Further, in Patent Document 2, in order to form a gas partition wall, the periphery of the cable jacket removal portion is covered with a case, and the case is filled with resin and cured, and then the spring pipe in the case is cut. A technique is described in which the wedge that has been put in is removed and the cured resin is fastened to keep it airtight.
In Patent Document 3, a water-stopping treatment is performed by dropping a resin on a portion where the coating is removed. Moreover, in patent document 4, the tube which consists of resin is covered on the part which removed the coating | cover, and the water stop of the electric wire is performed.

Japanese Patent Laid-Open No. 9-308071 Japanese Patent Laid-Open No. 7-78529 JP 2010-192129 A JP 2009-152012 A

  After the resin is cured and the sealing portion is formed, if the sealing portion expands and contracts due to a temperature change such as a temperature difference, the sealing performance of the sealing portion may deteriorate. For example, when the cured resin (sealing part) in the enclosure of Patent Document 1 is expanded, high pressure is applied to the resin, the sealing part is destroyed, and the sealing performance may be reduced.

  According to the spring pipe system of Patent Document 2, even if the resin expands and contracts due to a temperature change, the spring pipe in the case tightens the resin, so that the sealing performance can be maintained. However, with the spring pipe method, it is necessary to put the cable in the spring pipe, which is a cylindrical spring steel with a wedge, so it is difficult to place the spring pipe around the cable unless it is at the end of the cable. is there. For this reason, even if it is not the terminal of a cable, the structure which can press a sealing part is desirable.

  An object of this invention is to provide the novel structure which can maintain the sealing performance of a sealing part, even if a sealing part expand | swells and shrinks.

  A main invention for achieving the above object is a packing that covers the periphery of a cable from which a jacket has been removed, and a sealing portion can be formed in a removed portion of the jacket by curing the resin filled in the inner space. A sealing structure including a packing and a case main body that compresses the packing and seals the internal space, wherein the case main body includes an elastic member, and the elastic member deforms the elastic member by elastic deformation. A sealing structure that absorbs deformation of a sealing portion.

  Other characteristics of the present invention will be made clear by the description and drawings described later.

  According to this invention, even if a sealing part expand | swells and shrinks, the sealing performance of a sealing part can be maintained.

Drawing 1 is an explanatory view of the installation situation of sealing structure 1 of a 1st embodiment. FIG. 2 is a cross-sectional view of the cable 10. FIG. 3 is an overall perspective view of the sealing structure 1. FIG. 4 is a schematic cross-sectional view of the sealing structure 1. FIG. 5 is a view in which the sealing case 2 is separated from the gripping tool 38. FIG. 6 is an exploded view of the sealing case 2. 7A to 7F are explanatory diagrams of a method of using the sealing case 2. FIG. 8A is an explanatory view of how to wind the reference example of the air tight tape 27. FIG. 8B is an explanatory diagram of how to wind the air tight tape 27 of this embodiment. FIG. 8C is a cross-sectional view of the vicinity of the downstream gripping portion 382. FIG. 9 is a view in which the bypass case 5 of the bypass portion 4 is separated from the gripping tool 68. FIG. 10 is an exploded view of the bypass case 5. 11A to 11E are explanatory views of attachment of the bypass unit 4. FIG. 12 is an explanatory diagram of the sealing case 2 of the second embodiment. FIG. 13 is an explanatory diagram of the sealing case 2 of the third embodiment.

  At least the following matters will be apparent from the description and drawings described below.

A packing that covers the periphery of the cable from which the jacket has been removed, the packing that can cure the resin filled in the inner space to form a sealing portion in the removed portion of the jacket, and presses the packing, A sealing structure including a case main body for sealing a space, wherein the case main body includes an elastic member and absorbs deformation of the sealing portion by elastic deformation of the elastic member. The sealing structure will be clarified.
According to such a sealing structure, the sealing performance of the sealing portion can be maintained even if the resin (sealing portion) cured in the internal space expands and contracts.

  It is desirable that the case body has an adjustment unit that adjusts the amount of elastic deformation of the elastic member. Thereby, the elastic deformation amount of an elastic member can be adjusted to such an extent that sealing performance can be maintained.

  The case body preferably includes two cases sandwiching the packing, and absorbs fluctuations in the distance between the two cases by elastic deformation of the elastic member. Thereby, it becomes easy to attach a case main body to a cable.

  A frame and a screw, and the screw fixes a distance between the frame and the case on the opposite side of the frame, and the gap between the frame and the case on the frame side It is desirable that the elastic member can be compressed and deformed. Thereby, it is possible to compress the elastic member while pressing the resin by tightening the screw.

  It is desirable to further include a bypass portion that bypasses the sealing portion and flows gas to the cable on the downstream side. Thereby, even if the flow of gas is stopped at the sealing portion, the gas can flow through the cable on the downstream side.

A step of removing a jacket of the cable, a step of covering the periphery of the removed portion of the jacket with a packing, and sealing an internal space of the packing with a case body having an elastic member capable of absorbing deformation of the packing; and A method of manufacturing a sealing structure is provided that includes filling a resin into an internal space and curing the resin to form a sealing portion.
According to such a manufacturing method, the sealing portion can be formed in the internal space that can maintain the pressing force even when it expands and contracts.

  It is desirable to further include a step of compressing and deforming the elastic member and pressing the sealing portion with the case body after the sealing portion is formed. Thereby, even if the resin (sealing part) hardened | cured in internal space expand | swells and shrink | contracts, the sealing performance of a sealing part can be maintained.

=== First Embodiment ===
<Overview>
Drawing 1 is an explanatory view of the installation situation of sealing structure 1 of a 1st embodiment. FIG. 2 is a cross-sectional view of the cable 10.

  The cable 10 has a structure capable of gas maintenance, and a gap in the cable 10 is a gas passage. The gas flowing through the cable 10 is, for example, dry air. However, it is not limited to dry air, and may be an inert gas or a gas with a smell.

  The cable 10 includes a number of metal core wires 11, a presser winding 12, and a LAP sheath 13 in order from the inside (see FIG. 2). The LAP sheath 13 is composed of an aluminum tape 14 (conductive film) and a jacket 15. The cable 10 is a LAP sheath cable for telephone communication, for example, and includes, for example, 400 to 1200 pairs of metal core wires 11. A vinyl layer may be disposed between the metal core wire 11 and the presser winding 12. Further, a net tape may be disposed under the sheath, and an aluminum tape may be disposed under the net tape.

  Gas (for example, dry air) is sent out from the station side upstream of the cable 10 at a pressure higher than atmospheric pressure. The cable 10 is branched from the trunk cable at the closure 8 in the manhole and led out to the ground as a startup cable. A ground dam 9 is provided at the end of the start-up cable 10, and the gas sent from the station building side is sealed by the ground dam 9. That is, gas is filled in the cable 10 and the closure 8 between the station building side and the ground dam 9.

  When a disaster such as a tsunami occurs, the ground cable 10 and the ground dam 9 may be damaged, and the gas pressure in the cable may decrease. Under the condition that the gas pressure in the cable is lowered, if water enters from a damaged portion of the cable 10 or the like, the water flows through the cable 10 through the gas passage so far, and the closure 8 or the trunk cable is submerged. There is a risk. Restoration of overhead cables and service lines is easy, but if the trunk cable is submerged, it takes a lot of time and money to restore.

  Therefore, in the first embodiment, the gas flow path is secured by the bypass portion 4 while the sealing case 2 stops the flow of water that has entered the cable 10 during a disaster. Further, the check valve 7 prevents the flow of water that has entered the bypass portion 4 during a disaster while securing a normal gas flow.

  FIG. 3 is an overall perspective view of the sealing structure 1. FIG. 4 is a schematic cross-sectional view of the sealing structure 1. The white arrow in the figure indicates the gas flow direction, and the black arrow indicates the water flow direction.

  In the following description, each direction is defined as shown in FIGS. That is, let the direction of the cable 10 be a “length direction”. Further, “upstream” and “downstream” are defined based on the direction of the gas flowing in the cable 10. Further, the side of the sealing case 2 having the resin inlet is “upper” and the opposite side is “lower”. In addition, a direction perpendicular to the length direction and the vertical direction is referred to as “left-right direction”, the right side when viewed from the upstream side is referred to as “right”, and the opposite side is referred to as “left”.

  The sealing structure 1 includes a sealing case 2 and a bypass part 4. Inside the case 2 for sealing, the sealing part 3 which performed the sealing process (water stop process) to the cable 10 is formed (refer FIG. 4). The sealing portion 3 covers the periphery of the outer sheath removal portion 17 of the cable 10 with a sealing packing 20, fills the internal space 21 sealed with the sealing packing 20, and then hardens the resin, Is formed. Although the flow of water from the downstream side to the upstream side is stopped by the sealing portion 3, the normal gas flow is also stopped by the sealing portion 3.

Therefore, a bypass unit 4 is provided for bypassing the sealing unit 3 and flowing gas. Thereby, the gas sent from the station side flows from the upstream closure 8 of the sealing case 2 to the cable 10 on the downstream side of the sealing case 2 via the bypass portion 4. .
The bypass unit 4 is provided with a check valve 7. Even if water enters from a damaged portion of the jacket 15 of the cable 10 under a situation where the gas pressure in the cable 10 is reduced, and the water bypasses the sealing portion 3 and enters the bypass portion 4, the check valve 7 Can stop flooding upstream.

By the way, the sealing part 3 is pressed with an appropriate force, so that the sealing performance of the sealing part 3 formed of resin is maintained. However, the sealing part 3 expands / contracts due to a temperature change such as a temperature difference. And when temperature rises and the sealing part 3 expand | swells and the pressure inside the packing 20 for sealing becomes high, there exists a possibility that the sealing part 3 may be destroyed and sealing performance may fall. Moreover, when temperature falls and the sealing part 3 shrink | contracts, the force which presses the sealing part 3 formed with resin will fall, and there exists a possibility that sealing performance may fall also in this case.
Therefore, the sealing case 2 of the first embodiment has a spring 332 (refer to FIG. 3: equivalent to an elastic member). Thereby, even if the sealing part 3 expands and contracts due to a temperature change, the spring 332 absorbs the deformation and maintains the force for pressing the sealing part 3.

  Hereinafter, the sealing case 2 and the bypass portion 4 constituting the sealing structure 1 will be described.

<Configuration of sealing case 2>
FIG. 5 is a view in which the sealing case 2 is separated from the gripping tool 38.
The gripping tool 38 is a member that grips the cable 10 on the upstream side and the downstream side of the sealing case 2. The gripping tool 38 includes an upstream gripping portion 381, a downstream gripping portion 382, and a connecting portion 383. The upstream gripping portion 381 is a member that grips the cable 10 on the upstream side of the sealing case 2. The upstream gripping portion 381 grips the cable 10 by holding the cable 10 from above and below by two members. The downstream gripping portion 382 is a member that grips the cable 10 on the downstream side of the sealing case 2. The downstream gripping portion 382 grips the cable 10 by holding the cable 10 from above and below by two members. The connecting portion 383 is a member that connects the upstream gripping portion 381 and the downstream gripping portion 382. The connecting portion 383 suppresses the bending of the cable 10 between the upstream gripping portion 381 and the downstream gripping portion 382.

  FIG. 6 is an exploded view of the sealing case 2. Hereinafter, the structure of the sealing case 2 will be described with reference to FIGS.

  Before the sealing case 2 is filled with resin, the sealing case 2 is a member that forms a resin-filling space around the outer sheath removal portion 17 of the cable 10 and seals the space. . In addition, after the resin filled inside is cured to form the sealing portion 3, the sealing case 2 is a member that presses the sealing portion 3 and maintains the sealing performance of the sealing portion 3. is there. The sealing case 2 has a sealing packing 20 and a case main body 30.

  The sealing packing 20 is a cylindrical rubber packing. The sealing packing 20 can cover the periphery of the jacket removing portion 17 of the cable 10 and can form the sealing portion 3 by filling the internal space 21 with resin. The sealing packing 20 has elasticity, and when it is compressed from the outside (case body 30), the internal sealing portion 3 is compressed. Two sheets are attached to the left and right side surfaces of the sealing packing 20. However, instead of attaching two sheets to the left and right side surfaces of the sealing packing 20, the sealing packing 20 and the sheet can be integrally formed.

  A slit 22 is formed on the side surface of the sealing packing 20 (see FIG. 6). The operator opens the slit 22 and covers the periphery of the outer cover removing portion 17 of the cable 10 with the sealing packing 20.

  The inner diameter of the sealing packing 20 is larger than the outer diameter of the cable 10. For this reason, when the periphery of the cable 10 is covered with the sealing packing 20, a space (internal space 21) is formed between the sealing packing 20 and the cable 10, and this space is filled with resin. . As will be described later, the air tight tape 27 is wound around the outer periphery of the cable 10 to fill a gap between the end portion 24 of the sealing packing 20 and the cable 10 and to seal the internal space 21. (See FIG. 8C).

  Three holes 23 are formed on the upper side of the sealing packing 20. The pipe portions of the pipe joints 35 are inserted into the respective holes 23 from the inside of the sealing packing 20. The pipe joint 35 is fixed to the lower side of the joint nipple 36 from the inside of the internal space 21 so as to sandwich the sealing packing 20 and the case main body 30 (upper case).

  The case body 30 is a member that presses the sealing packing 20. Before the resin is filled in the internal space 21 of the sealing packing 20, the case main body 30 presses the sealing packing 20, whereby the internal space 21 of the sealing packing 20 is sealed. In addition, after the resin is cured inside the sealing packing 20 and the sealing portion 3 is formed, the sealing portion 3 is also pressed by the case body 30 pressing the sealing packing 20, thereby The sealing performance of the sealing part 3 formed of resin is maintained.

  The case main body 30 includes an upper case 31, a lower case 32, and a spring mechanism 33. The upper case 31 has a semi-cylindrical portion 311 and left and right edge portions 312. Similarly, the lower case 32 also has a semi-cylindrical portion 321 and left and right edge portions 322.

  The inner peripheral surface of the semi-cylindrical portion 311 of the upper case 31 and the inner peripheral surface of the semi-cylindrical portion 321 of the lower case 32 are in close contact with the outer peripheral surface of the sealing packing 20 and press the sealing packing 20 from here. . The semi-cylindrical portion 311 of the upper case 31 and the upper side of the sealing packing 20 are fixed by a pipe joint 35 and a joint nipple 36. With the upper case 31 and the sealing packing 20 attached, the operator opens the slit 22 of the sealing packing 20, attaches the upper case 31 and the sealing packing 20 to the cable 10, and then the upper case 31. The lower case 32 is attached to.

  The edge 312 of the upper case 31 is a portion protruding outward from the end of the semi-cylindrical portion 311. Similarly, the edge portion 322 of the lower case 32 is a portion protruding outward from the end portion of the semi-cylindrical portion 321. When the lower case 32 is attached to the upper case 31, the edge 312 of the upper case 31 and the edge 322 of the lower case 32 are opposed to each other.

  The upper case 31 and the lower case 32 are substantially vertically symmetrical, but the semi-cylindrical portion 311 of the upper case 31 is formed with three holes 311A for inserting the pipe portion of the pipe joint 35. By the pipe joint 35 and the joint nipple 36, the sealing packing 20 is fixed to the case body 30 (upper case), and a resin injection passage and a ventilation passage are formed.

  The resin injection passage and the ventilation passage are passages that allow the internal space 21 of the sealing packing 20 to communicate with the outside. The resin injection passage is formed by the middle pipe joint 35 and joint nipple 36, and serves as a passage for filling the internal space 21 of the sealing packing 20 with resin. The ventilation passage is formed by pipe joints 35 and joint nipples 36 at both ends, and serves as a passage for discharging air from the internal space 21 of the sealing packing 20 when the resin is filled.

  The spring mechanism 33 is a mechanism that maintains the force for compressing the sealing packing 20 (and the sealing portion 3) while allowing a change in the distance between the upper case 31 and the lower case 32. Even if the sealing portion 3 (see FIG. 4) expands and contracts due to a temperature change such as a temperature difference by the spring mechanism 33, the spring 332 (described later) absorbs the deformation and compresses the sealing portion 3. The force is maintained and the sealing performance is maintained. The spring mechanism 33 is provided above the left and right edges 312 of the upper case 31, respectively.

Each of the left and right spring mechanisms 33 includes a mount 331, a spring 332, three adjustment screws 333, and two shaft screws 334.
The gantry 331 is a plate-like pedestal that supports the spring 332 and the adjustment screw 333 (and the shaft screw 334). The gantry 331 is disposed above the edge 312 of the upper case 31. When viewed from the gantry 331, the upper case 31 is disposed on the gantry 331 side, and the lower case 32 is disposed on the opposite side of the gantry 331.
The spring 332 is an elastic member that absorbs deformation when the sealing portion 3 expands and contracts.
When the spring 332 is elastically deformed, a force for pressing the sealing packing 20 (and the sealing portion 3) is maintained while allowing a change in the distance between the upper case 31 and the lower case 32. The spring 332 is disposed between the gantry 331 and the edge 312 of the upper case 31. Note that the spring 332 may be interposed between the head of the adjustment screw 333 and the case main body 30 (upper case 31) by omitting the mount 331 and pressing the upper end of the spring 332 with the head of the adjustment screw 333. Is possible. In addition, other elastic members such as rubber may be used instead of the spring 332.
The adjustment screw 333 and the shaft screw 334 serve as the shaft of the spring 332, and limit the deformation direction of the spring 332 in the vertical direction. The head (upper end) of the adjustment screw 333 is on the mount 331, and a through hole (not shown) through which the adjustment screw 333 passes is formed in the edge 312 of the upper case 31, and the lower end of the adjustment screw 333 is The lower case 32 is fixed to the edge 322 of the lower case 32, whereby the lower case 32 is attached to the upper case 31. The upper end of the shaft screw 334 is fixed to the mount 331, the lower end of the shaft screw 334 is a free end, and the shaft screw 334 has a length that does not reach the edge 312 of the upper case 31. The number of springs 332 of the spring mechanism 33 is increased by adding the shaft screw 334 and the spring 332 supported by the shaft screw 334 to the spring mechanism 33. The shaft screw 334 and the spring 332 supported by the shaft screw 334 can be omitted.

  The spring 332 is disposed in a state of being compressed and deformed between the gantry 331 and the edge 312 of the upper case 31. As will be described later, after the resin is cured and the sealing portion 3 (see FIG. 4) is formed, the adjustment screw 333 is tightened (see FIG. 7F), whereby the spring 332 is attached to the mount 331 and the upper case 31. It will be in the state compressed and deformed between the edge parts 312. Then, when the adjustment screw 333 presses the case main body 30 with the spring 332 interposed therebetween, the sealing portion 3 (see FIG. 4) is pressed through the sealing packing 20. The repulsive force of the spring 332 acts in a direction in which the gantry 331 and the upper case 31 are separated. On the other hand, the distance between the mount 331 and the edge 322 of the lower case 32 is fixed by the adjustment screw 333. Thereby, the repulsive force of the spring 332 acts in the direction in which the upper case 31 and the lower case 32 are brought closer. That is, the compression-deformed spring 332 applies a force that presses the sealing packing 20 (and the sealing portion 3) against the upper case 31 and the lower case 32. Even when the distance between the base 331 and the edge 322 of the lower case 32 is fixed by the adjusting screw 333, the distance between the upper case 31 and the lower case 32 varies due to the elastic deformation of the spring 332. Is allowed.

  Further, the distance between the mount 331 and the edge 322 of the lower case 32 can be adjusted (changed) by the adjusting screw 333, whereby the amount of compressive deformation of the spring 332 can be adjusted. That is, the adjustment screw 333 is an adjustment unit that adjusts the amount of elastic deformation of the spring 332 that is an elastic member. If the distance between the mount 331 and the lower case 32 is made too long by the adjusting screw 333, the amount of compressive deformation of the spring 332 decreases, and the spring 332 absorbs the deformation of the sealing portion 3 when the sealing portion 3 contracts greatly. It becomes difficult to maintain the force with which the case main body 30 presses the sealing packing 20. On the other hand, if the distance between the mount 331 and the lower case 32 is made too short by the adjusting screw 333, the amount of compressive deformation of the spring 332 increases, and the deformation of the sealing portion 3 is reduced by the spring when the sealing portion 3 expands greatly. There is a possibility that the pressure inside the case main body 30 becomes high when the 332 cannot be completely absorbed and the sealing portion 3 expands greatly. Therefore, the distance between the mount 331 and the edge 322 of the lower case 32 is appropriately adjusted by the adjustment screw 333, and the amount of compressive deformation of the spring 332 is adjusted to the extent that the deformation of the sealing portion 3 can be absorbed. .

  The adjustment screw 333 also has a function of adjusting the distance between the upper case 31 and the lower case 32. Specifically, when the adjustment screw 333 is tightened, the distance between the upper case 31 and the lower case 32 is narrowed (as a result, the force with which the case main body 30 presses the sealing packing 20 is increased). Further, when the adjustment screw 333 is loosened, the distance between the upper case 31 and the lower case 32 is increased (as a result, the force with which the case main body 30 presses the sealing packing 20 is weakened). As will be described later, after the resin is cured and the sealing portion 3 (see FIG. 4) is formed, the adjustment screw 333 is tightened (see FIG. 7F), so that the upper case is higher than the stage where the resin is cured. Since the space between the lower case 32 and the lower case 32 is narrowed, the force with which the case main body 30 presses the sealing packing 20 is increased, and the resin (sealing portion 3) cured in the sealing packing 20 is pressed. It will be.

  According to the sealing case 2 of the first embodiment, the case body 30 has the spring 332 (elastic member). Even if the sealing portion 3 (see FIG. 4) expands and contracts due to a temperature change such as a temperature difference, the spring 332 is elastically deformed, so that the deformation is absorbed and a force to compress the sealing portion 3 is generated. Maintained. That is, when the temperature rises and the sealing portion 3 expands, the pressure inside the sealing packing 20 increases because the spring 332 compresses and deforms when the pressure inside the sealing packing 20 increases. Therefore, the sealing portion 3 is prevented from being broken. Further, when the sealing portion 3 contracts due to a decrease in temperature, the spring 332 that has been compressed and deformed slightly extends, and the sealing packing 20 is sandwiched between the upper case 31 and the lower case 32. Since a state is maintained, the force which presses the sealing part 3 is maintained.

  In the first embodiment, the upper case 31 and the lower case 32 of the case body 30 are provided so as to sandwich the sealing packing 20. For this reason, even if it is not the terminal of the cable 10, it becomes easy to arrange | position the case main body 30 around the cable 10. FIG. In the first embodiment, the variation in the distance between the upper case 31 and the lower case 32 is absorbed by the elastic deformation of the spring 332. Thereby, even if the sealing part 3 expand | swells and shrink | contracts and the space | interval of the upper case 31 and the lower case 32 fluctuates, the force which presses the sealing part 3 is maintained.

  Further, in the first embodiment, the gantry 331 and the upper case 31 (on the side of the gantry 331 side) are fixed in a state where the distance between the gantry 331 and the lower case 32 (the case opposite to the gantry 331) is fixed by the adjustment screw 333. A spring 332 compressed and deformed is disposed between the case and the case. With this configuration, as shown in FIG. 7F, which will be described later, if the adjustment screw 333 is tightened, the spring 332 can be compressed while pressing the sealing portion 3, and the work of pressing the cured resin is easy. become.

<Usage method of sealing case 2 (manufacturing method of sealing portion 3)>
7A to 7F are explanatory diagrams of a method of using the sealing case 2. First, the operator performs preprocessing of the cable 10 (see FIGS. 7A to 7C).

  The operator determines the attachment position of the sealing case 2 on the downstream side of the closure 8 and removes the jacket 15 within a predetermined range (forms the jacket removal portion 17) as shown in FIG. 7A. At this time, since it is necessary to expose the metal core wire 11, the operator removes not only the jacket 15 but also the aluminum tape 14 and the presser winding 12.

  Next, as shown in FIG. 7B, the operator may wind a self-bonding tape so as to bundle the metal core wires 11 at the end of the jacket removal portion 17. As a result, the metal core wires 11 are tightly bundled at the end of the jacket removal portion 17, so that when the sealing case 2 is filled with resin later, the resin moves from the jacket removal portion 17 to the inside of the cable 10. It becomes difficult to leak.

  Next, as shown in FIG. 7C, the operator winds the air tight tape 27 at a position outside the outer cover removal portion 17 and at both ends of the sealing packing 20 later. The air tight tape 27 is a rubber tape for filling the space between the outer peripheral surface of the cable 10 and the inner peripheral surface of the end 24 of the sealing packing 20. The operator winds the air tight tape 27 around the outer periphery of the cable 10 until the outer diameter of the wound air tight tape 27 is about the inner diameter of the end 24 of the sealing packing 20 (or slightly larger than the inner diameter).

FIG. 8A is an explanatory view of how to wind the reference example of the air tight tape 27. Since the air tight tape 27 is thick, if the air tight tape 27 is simply wrapped around the outer peripheral surface of the cable 10, a gap corresponding to the thickness of the air tight tape 27 is generated. For example, in FIG. 8A, a gap having a triangular cross section is formed by the inner end of the air tight tape 27, the outer peripheral surface of the cable 10, and the air tight tape 27 (the portion that moves from the first layer to the second layer). ing. Similarly, a gap is also formed between the outer end of the air tight tape 27 and the sealing packing 20 (not shown).
On the other hand, in this embodiment, as shown in FIG. 8B, both ends of the air tight tape 27 are chamfered so that the ends of the air tight tape 27 become thinner. This makes it possible to fill a gap as in the reference example of FIG. 8A. In addition, a gap between the cable 10 and the air tight tape 27 or a gap between the air tight tape 27 and the sealing packing 20 may be filled by winding a sealing tape (not shown) further inside and outside the air tight tape 27. .
Further, instead of using the air tight tape 27, the gap between the outer peripheral surface of the cable 10 and the inner peripheral surface of the end portion 24 of the sealing packing 20 may be filled with another rubber member. Further, as described in the third embodiment (described later), by matching the inner diameter of the end portion of the sealing packing 20 with the outer diameter of the cable 10, the outer peripheral surface of the cable 10 and the end portion of the sealing packing 20 are used. It is also possible to eliminate 24 gaps.

  After finishing the pretreatment of the cable 10, the operator attaches the sealing case 2 to the cable 10 as shown in FIG. 7D. At this time, the lower case 32 is removed from the sealing case 2, and the operator opens the slit 22 (see FIG. 6) on the side surface of the sealing packing 20 fixed to the upper case 31. The sealing packing 20 and the upper case 31 are attached to the cable 10 so as to cover the removed portion 17 with the sealing packing 20. Thereafter, the operator attaches the lower case 32 to the upper case 31 by tightening the adjustment screw 333 of the spring mechanism 33. At this time, the operator tightens the adjustment screw 333 to such an extent that the spring 332 of the spring mechanism 33 is compressed with a predetermined displacement. As a result, the case main body 30 presses the sealing packing 20 and the internal space 21 of the sealing packing 20 is sealed.

  After the sealing case 2 is attached, the operator attaches the gripping tool 38 to the cable 10 as shown in FIG. 7D. Specifically, the operator attaches the upstream gripping portion 381 (see FIG. 5) to the upstream side of the sealing case 2, attaches the downstream gripping portion 382 to the downstream side of the sealing case 2, and sets the upstream side. The gripping portion 381 and the downstream gripping portion 382 are connected by a connecting portion 383. Thereby, the curve of the cable 10 is suppressed and it is prevented that a gap is formed between the sealing case 2 and the cable 10.

  FIG. 8C is a cross-sectional view of the vicinity of the downstream gripping portion 382. The downstream gripping portion 382 has a side wall portion 382A on the upstream side. The side wall part 382A has a surface perpendicular to the length direction and has a function of pressing the air tight tape 27 from the downstream side. Thereby, the air tight tape 27 wound around the cable 10 is prevented from collapsing to the outside (downstream side). The central portion of the sealing packing 20 is formed thicker than the end portion 24, and a step is formed on the inner peripheral surface of the sealing packing 20. This step prevents the airtight tape 27 wound around the cable 10 from collapsing inward (upstream side) by pressing the airtight tape 27 from the upstream side. That is, the air tight tape 27 is prevented from collapsing by being sandwiched between the step on the inner peripheral surface of the sealing packing 20 and the side wall portion 382A of the downstream gripping portion 382. Although not shown, the same applies to the vicinity of the upstream gripping portion 381 (the air tight tape 27 is sandwiched between the step on the inner peripheral surface of the sealing packing 20 and the side wall portion of the upstream gripping portion 381. ing).

  Next, the worker injects resin into the sealing case 2 as shown in FIG. 7E. At this time, the operator removes the plugs (screws) of the three joint nipples 36 and connects a tube for resin injection to the joint nipple 36 at the center. A resin pack is attached to the other end of the tube, and the resin in the resin pack is injected into the sealing case 2 from a resin injection passage formed by the joint nipple 36 and the pipe joint 35 at the center. The remaining two joint nipples 36 remain unplugged for ventilation.

  At this time, the operator hangs the resin pack so as to be higher than the sealing case 2 and injects the resin of the resin pack into the sealing case 2. If the position of the resin pack is too low, the pressure for filling the resin will be low, and the resin will not permeate sufficiently between the metal cores 11 (see FIG. 2) of the outer sheath removal part 17, so There is a possibility that a gap remains and the sealing process becomes insufficient. For this reason, it is desirable that the operator hangs the resin pack on the hanging metal fitting in order to keep the resin pack at a predetermined height.

  In this embodiment, the sealing performance is maintained by pressing the sealing portion 3. For this reason, it is desirable that the resin forming the sealing portion 3 is a resin having elasticity after curing. As such a resin, an elastic resin such as a urethane resin or a silicon resin can be used.

  When the resin fills the internal space 21 of the sealing packing 20 of the sealing case 2, the resin overflows from the vent coupling nipple 36, so that the operator can use the joint nipple 36 from which the resin has come out. Set a plug (screw) on the and close the ventilation passage. At this stage, there is a possibility that the resin has not yet sufficiently permeated between the metal core wires 11 of the jacket removal portion 17. For this reason, the operator keeps the resin pack connected to the joint nipple 36 at the center of the sealing case 2 until a predetermined time (for example, 1 day) for the resin to harden, and continues to inject the resin. Keep it. The worker keeps the resin pack at a predetermined height by suspending the resin pack on the hanging metal fitting until the resin sufficiently permeates and loses fluidity.

  After a predetermined time has elapsed since the resin injection, the operator checks whether or not the resin remaining in the resin pack is cured. If the resin of the resin pack is cured, it is considered that the resin filled in the internal space 21 of the sealing packing 20 of the sealing case 2 is also cured and the sealing process is performed. That is, it is considered that the sealing portion 3 (see FIG. 4) has been formed at this stage. After confirming the hardening of the resin, the operator sets a plug (screw) in the central joint nipple 36 and closes the resin injection passage.

  After the resin is cured, the operator further tightens and retightens the adjustment screw 333 of the spring mechanism 33 of the sealing case 2 as shown in FIG. 7F. At this time, the operator tightens the adjustment screw 333 to such an extent that the spring 332 of the spring mechanism 33 is compressed with a predetermined displacement. By this tightening, the spring 332 is further compressed and deformed as compared with the stage in which the resin is cured, and the space between the upper case 31 and the lower case 32 is narrowed, and the resin (sealing portion) cured in the sealing packing 20. 3) is pressed and the sealing function of the sealing part 3 is maintained.

<Configuration of bypass unit 4>
FIG. 9 is a view in which the bypass case 5 of the bypass portion 4 is separated from the gripping tool 68. As shown in the figure, the bypass unit 4 includes a bypass case 5 and a gripping tool 68. Moreover, the bypass part 4 has the bypass pipe 6 as shown in FIG.3 and FIG.4.

  The gripping tool 68 is a member that grips the cable 10 on the upstream side and the downstream side of the bypass case 5. The gripping tool 68 includes an upstream gripping part 681, a downstream gripping part 682, and a connecting part 683. The configuration of the gripping tool 68 of the bypass unit 4 is substantially the same as the gripping tool 38 (see FIG. 5) of the sealing case 2.

FIG. 10 is an exploded view of the bypass case 5. Hereinafter, the structure of the bypass case 5 will be described with reference to FIGS.
The bypass case 5 is a member for supplying the gas supplied from the closure 8 to the cable 10 on the downstream side. The bypass case 5 includes a bypass packing 50 and a bypass case body 60.

  The bypass packing 50 is a cylindrical rubber packing. The bypass packing 50 is a member that covers the periphery of the jacket removing portion 19 of the cable 10. The bypass packing 50 has elasticity. Similarly to the sealing packing 20, slits (not shown) are formed on the side surface of the bypass packing 50. The operator opens this slit and covers the periphery of the jacket removing portion 19 of the cable 10 with the bypass packing 50.

The inner diameter of the bypass packing 50 is larger than the outer shape of the cable 10. For this reason, when the cable 10 is covered with the bypass packing 50, a space is formed between the bypass packing 50 and the cable 10, and this space becomes a gas passage (see FIG. 4).
As in the case of the sealing packing 20 (see FIG. 8C), the air tight tape 57 (see FIG. 4) is wound around the outer periphery of the cable 10 so that the end portion of the bypass packing 50 is connected to the cable 10. Is filled, and the space inside the bypass packing 50 is sealed. Similarly to the case of the sealing packing 20 (see FIG. 8C), the center portion of the bypass packing 50 is formed thicker than the end portion, and a step is formed on the inner peripheral surface of the bypass packing 50. ing. As in the case of the sealing packing 20 (see FIG. 8C), the air tight tape 57 wound around the cable 10 is sandwiched between the step on the inner peripheral surface of the bypass packing 50 and the side wall portion of the gripping portion. Will be.

  One hole (not shown) is formed on the upper side of the bypass packing 50. The pipe portion of the pipe joint 65 is inserted into the hole from the inside of the bypass packing 50. The pipe joint 65 is fixed to the bypass joint 66 so as to sandwich the bypass packing 50 and the bypass case main body 60 (upper case).

  One end of a ground wire 72 is electrically connected to the pipe joint 65. The other end of the ground wire 72 is electrically connected to the aluminum tape 14 of the cable 10 (see FIG. 4). The pipe joint 65 and the bypass joint 66 are made of conductive metal, and the bypass joint 66 and the closure 8 are electrically connected by another ground wire 73 (FIGS. 3 and 4). reference). Since the ground wire 73 connecting the bypass joint 66 and the closure 8 is separate from the ground wire 72 connected to the pipe joint 65, water enters the cable 10 and the bypass packing 50. Even if water enters the ground wire 72, water does not enter the ground wire 73 or the closure 8.

  A pressure measuring valve 661 is attached to the bypass joint 66. When the pressure measuring valve adapter for attaching a pressure gauge (see FIG. 11D described later) to the pressure measuring valve 661 is not attached, the pressure measuring valve 661 is closed. When the pressure gauge is attached to the pressure measuring valve 661 via the pressure measuring valve adapter, the pressure measuring valve 661 opens and the pressure gauge can measure the pressure inside the bypass packing 50.

  A check valve 7 is attached to the bypass joint 66. Here, the check valve 7 is disposed at the end of the bypass pipe 6 (see FIGS. 3 and 4) and is directly connected to the bypass joint 66. However, the check valve 7 is not directly connected to the bypass joint 66, but the check valve 7 is arranged in the middle of the bypass pipe 6 (see FIGS. 3 and 4), and the end of the bypass pipe 6 is It may be connected to the bypass joint 66.

  The bypass case main body 60 is a member that presses the bypass packing 50. When the bypass case main body 60 presses the bypass packing 50, the internal space of the bypass packing 50 is sealed. The bypass case body 60 includes an upper bypass case 61, a lower bypass case 62, and a fixing screw 63.

  Similar to the upper case 31 of the sealing case 2, the upper bypass case 61 includes a semi-cylindrical portion 611 and left and right edge portions 612. Similarly, the lower bypass case 62 also has a semi-cylindrical portion 621 and left and right edge portions 622. The upper bypass case 61 and the lower bypass case 62 are substantially vertically symmetrical, but a hole (not shown) for inserting the pipe portion of the pipe joint 65 is formed in the semi-cylindrical portion 611 of the upper bypass case 61. ing. By the pipe joint 65 and the bypass joint 66, the bypass packing 50 is fixed to the bypass case main body 60 (upper case) and a gas passage is formed.

  The gas passage is a passage that communicates the space inside the bypass packing 50 with the outside. The gas passage is formed by the pipe joint 65 and the bypass joint 66, and serves as a passage for supplying the gas supplied from the closure 8 to the inside of the bypass case 5 (bypass packing 50).

  The inner peripheral surface of the semicylindrical portion 611 of the upper bypass case 61 and the inner peripheral surface of the semicylindrical portion 621 of the lower bypass case 62 are in close contact with the outer peripheral surface of the bypass packing 50, and the bypass packing 50 is pressed from here. . The semicylindrical portion 611 of the upper bypass case 61 and the upper side of the bypass packing 50 are fixed by a pipe joint 65 and a bypass joint 66. With the upper bypass case 61 and the bypass packing 50 attached (the state shown in FIG. 10), the operator opens the slit of the bypass packing 50 and attaches the upper bypass case 61 and the bypass packing 50 to the cable 10. Thereafter, the lower bypass case 62 is attached to the upper bypass case 61.

  When the lower bypass case 62 is attached to the upper bypass case 61, the edge 612 of the upper bypass case 61 and the edge 622 of the lower bypass case 62 are opposed to each other, and are screwed with a fixing screw 63.

  The bypass pipe 6 is a pipe for bypassing the sealing portion 3 and flowing gas downstream (see FIGS. 3 and 4). The upstream end of the bypass pipe 6 is connected to the closure 8. The downstream end of the bypass pipe 6 is connected to a bypass joint 66 of the bypass case 5. Thereby, the bypass pipe 6 can send the gas in the closure 8 to the bypass case 5.

  The bypass pipe 6 is provided with a check valve 7. The check valve 7 is a valve that stops the flow of water from the downstream side to the upstream side without stopping the flow of gas from the upstream side to the downstream side. As long as the check valve 7 has a function of stopping the flow of water in the reverse direction while allowing the flow of gas in one direction, various types of check valves can be appropriately employed. Further, the check valve 7 may stop the gas flow in the reverse direction, or may allow the gas flow in the reverse direction.

  The bypass pipe 6 is provided with a T-type valve 71. The T-type valve 71 is used for supplying gas to the closure 8, for example. The bypass pipe 6 may not have the T-type valve 71. The use of the T-type valve 71 is not limited to the supply of gas to the closure 8.

  In a normal state, the gas in the closure 8 is sent to the bypass pipe 6 and passes through the check valve 7 (see FIG. 4). The gas that has passed through the check valve 7 is sent to the inside of the bypass packing 50 of the bypass case 5 through the gas passage (the pipe joint 65 and the bypass joint 66) of the bypass case 5. Inside the bypass packing 50, there is a jacket removing portion 19 of the cable 10. Gas enters the cable 10 from the jacket removing portion 19 and is supplied to the downstream side of the cable 10. Thus, in a normal state, the gas flowing through the cable 10 bypasses the sealing portion 3 and flows downstream.

  When water enters from a damaged portion of the jacket 15 of the cable 10 under a situation where the gas pressure in the cable is reduced, the water may flow backward (running water) through the gap in the cable 10 that was a gas passage. . When the water that has flowed back reaches the bypass case 5, the water leaks from the jacket removing portion 19 in the bypass case 5. Since the internal space of the bypass case 5 is sealed, the water leaked from the cable 10 is accumulated in the bypass case 5 and flows through the gas passages (the pipe joint 65 and the bypass joint 66) of the bypass case 5. . However, since the check pipe 7 is provided in the bypass pipe 6, the flow of water reaching the gas passage of the bypass case 5 is stopped by the check valve 7 and flows further upstream. Is prevented.

<Attaching method of bypass part 4>
11A to 11E are explanatory views of attachment of the bypass unit 4.

  First, the operator performs preprocessing of the cable 10 (see FIG. 11A). At this time, the worker first removes the outer cover 15 (and the aluminum tape 14) in a predetermined range. Unlike the case of the pretreatment (see FIG. 7A) of the cable 10 at the time of manufacturing the sealing portion 3, the presser winding 12 is left. The reason for leaving the presser winding 12 is to prevent the resin at the time of forming the sealing portion 3 from leaking from the outer cover removing portion 19 along the cable 10. Next, as in the case of the pretreatment of the cable 10 at the time of manufacturing the sealing portion 3 (see FIG. 7B), the operator is at a position outside the jacket removal portion 19 and later on the bypass packing 50. The air tight tape 57 is wound around the both ends.

  After finishing the pretreatment of the cable 10, the operator connects the end of the ground wire 72 to the aluminum tape 14 of the cable 10 on the downstream side of the jacket removing portion 19 as shown in FIG. 11B. The opposite end of the ground wire 72 is connected to a pipe joint 65 inside the bypass packing 50 (see FIGS. 4 and 10).

  Next, the worker attaches the bypass case 5 to the cable 10 as shown in FIG. 11C. At this time, as shown in FIG. 10, the lower bypass case 62 is removed from the bypass case 5, and the operator opens the slit on the side surface of the bypass packing 50 fixed to the upper bypass case 61, The bypass packing 50 and the upper bypass case 61 are attached to the cable 10 so as to cover the removal portion 19 with the bypass packing 50. Thereafter, the operator attaches the lower bypass case 62 to the upper bypass case 61 by tightening the fixing screw 63 with a predetermined torque. Thereby, the bypass case main body 60 presses the bypass packing 50, and the space inside the bypass packing 50 is sealed.

  Further, after attaching the bypass case 5, the operator attaches the gripping tool 68 to the cable 10 as shown in FIG. 11C. Thereby, the curve of the cable 10 is suppressed, and a gap is prevented from being formed between the bypass case 5 and the cable 10. As in the case of the sealing case 2 shown in FIG. 8C, when the gripping portion is attached to the cable 10, the air tight tape 57 causes the step on the inner peripheral surface of the bypass packing 50 and the downstream gripping portion 682 or the upstream side. By being sandwiched between the side wall portion of the grip portion 681, it is prevented from collapsing.

  Note that after the bypass case 5 and the gripping tool 68 are attached, the sealing performance of the sealing portion 3 can be inspected. In this case, as shown in FIG. 11D, the operator connects a pressure gauge to the pressure measuring valve 661 of the bypass case 5 and supplies gas from the T-type valve 71 of the bypass pipe 6 to reduce the pressure inside the closure 8. Increase. At this time, when the cable 10 is not sufficiently sealed by the sealing portion 3 of the sealing case 2, the gas in the closure 8 flows inside the cable 10 and the sealing packing of the sealing case 2. 20 flows into the internal space 21 and further flows into the space inside the bypass packing 50 of the bypass case 5 through the inside of the cable 10. As a result, the pressure in the bypass case 5 increases. Therefore, the operator can inspect the sealing performance of the sealing portion 3 based on the pressure change of the pressure gauge when the atmospheric pressure in the closure 8 is increased.

  After attaching the bypass case 5 and the gripping tool 68, the operator attaches the bypass pipe 6 as shown in FIG. 11E. Thereby, the assembly of the bypass part 4 is completed.

=== Second Embodiment ===
In the first embodiment, the spring 332 is disposed above the upper case 31 of the sealing case 2. However, the arrangement of the springs 332 of the spring mechanism 33 is not limited to this.

FIG. 12 is an explanatory diagram of the sealing case 2 of the second embodiment.
The spring mechanism 33 according to the second embodiment includes an upper frame 331A, a lower frame 331B, an upper spring 332A, a lower spring 332B, an adjustment screw 333, and a shaft screw 334.

The upper base 331 </ b> A is a plate-like base that supports the upper spring 332 </ b> A and the adjustment screw 333 (and the shaft screw 334), and is disposed on the upper side of the edge 312 of the upper case 31. The lower pedestal 331B is a plate-shaped pedestal that supports the lower spring 332B and the adjustment screw 333 (and the shaft screw 334), and is disposed below the edge 322 of the lower case 32.
The upper spring 332A and the lower spring 332B are elastic members that absorb deformation when the sealing portion 3 expands and contracts. By elastically deforming the upper spring 332A and the lower spring 332B, a force for compressing the sealing packing 20 (and the sealing portion 3) is maintained while allowing a change in the distance between the upper case 31 and the lower case 32. Will be. The upper spring 332A is arranged in a state of being compressed and deformed between the upper base 331A and the edge 312 of the upper case 31. The lower spring 332 </ b> B is disposed in a state of being compressed and deformed between the lower base 331 </ b> B and the edge 322 of the lower case 32.
The head (upper end) of the adjustment screw 333 is on the upper base 331A, and a through hole (not shown) through which the adjustment screw 333 passes is formed in the edge 312 of the upper case 31 and the edge 322 of the lower case 32, respectively. The lower end of the adjustment screw 333 is fixed to the edge 322 of the lower case 32.

  Further, the distance between the upper base 331A and the lower base 331B can be adjusted (changed) by the adjusting screw 333. Further, the amount of compressive deformation of the upper spring 332A and the lower spring 332B can be adjusted by the adjusting screw 333. The adjustment screw 333 also has a function of adjusting the distance between the upper case 31 and the lower case 32.

  Also in the second embodiment, the resin is filled into the internal space 21 of the sealing packing 20 of the sealing case 2, and the resin is cured to form the sealing portion 3 (see FIG. 4). After the resin is cured, the operator further tightens the adjustment screw 333 by further tightening. By this tightening, the spring 332 is further compressed and deformed as compared with the stage in which the resin is cured, and the space between the upper case 31 and the lower case 32 is narrowed, and the resin (sealing portion) cured in the sealing packing 20. 3) is pressed and the sealing function of the sealing part 3 is maintained.

  Also in the case 2 for sealing of 2nd Embodiment, the case main body 30 has an elastic member (upper spring 332A and lower spring 332B). Even if the sealing portion 3 (see FIG. 4) expands and contracts due to temperature change, the deformation of the sealing portion 3 is absorbed by the elastic deformation of the elastic members (the upper spring 332A and the lower spring 332B), and the sealing portion 3 The force to press is maintained.

  Further, according to the sealing case 2 of the second embodiment, the amount of elastic deformation of the elastic member (the total amount of compressive deformation of the upper spring 332A and the lower spring 332B) compared to the sealing case 2 of the first embodiment. ) Can be increased. For this reason, even if the sealing case 2 of 2nd Embodiment has the expansion amount or shrinkage | contraction amount of the sealing part 3 large, the force which presses the sealing part 3 is maintained, the spring 332 absorbing the deformation | transformation. Is possible.

=== Third Embodiment ===
In the above embodiment, the spring mechanisms 33 are provided on both the left and right sides of the sealing case 2. However, the spring mechanism 33 may be provided on only one of the left and right sides.

FIG. 13 is an explanatory diagram of the sealing case 2 of the third embodiment.
The case body 30 includes a semi-cylindrical upper case 31 and a lower case 32. The upper case 31 and the lower case 32 are connected on the left side by a hinge. A spring mechanism 33 is provided on the opposite side of the hinge, and the edge 312 of the upper case 31 and the edge 322 of the lower case 32 are fastened by an adjusting screw 333.

  The spring 332 is disposed in a state of being compressed and deformed between the gantry 331 and the edge 312 of the upper case 31. Here, the spring 332 is disposed on the upper side of the upper case 31, but the spring 332 may also be disposed on the lower side of the lower case 32 as in the second embodiment.

  Also in the third embodiment, a resin is filled into the internal space 21 of the sealing packing 20 of the sealing case 2 and the resin is cured to form the sealing portion 3 (see FIG. 4). After the resin is cured, the operator further tightens the adjustment screw 333 by further tightening. By this tightening, the spring 332 is further compressed and deformed as compared with the stage in which the resin is cured, and the space between the upper case 31 and the lower case 32 is narrowed, and the resin (sealing portion) cured in the sealing packing 20. 3) is pressed and the sealing function of the sealing part 3 is maintained.

  Also in the case 2 for sealing of 3rd Embodiment, the case main body 30 has the spring 332. Even if the sealing portion 3 (see FIG. 4) expands and contracts due to a temperature change, the deformation of the sealing portion 3 is absorbed by the elastic deformation of the spring 332, and the force pressing the sealing portion 3 is maintained.

  By the way, in the above-described embodiment, the airtight tape 27 is wound around the outer peripheral surface of the cable 10, so that the gap between the end of the sealing packing 20 and the cable 10 is filled, and the internal space 21 is sealed. (FIG. 8C). On the other hand, in the third embodiment, the inner diameter of the central portion of the sealing packing 20 is larger than the outer diameter of the cable 10, while the inner diameter of the end portion 24 of the sealing packing 20 is the same as the outer diameter of the cable 10. Same level. Thereby, when the sealing packing 20 is attached to the cable 10, the inner surface of the end portion of the sealing packing 20 is in close contact with the outer periphery of the cable 10, so that the air tight tape 27 is not necessary. However, in this case, it is necessary to prepare the sealing packing 20 having a different inner diameter at each end for each cable 10 having a different diameter (if the air tight tape 27 is wound around the cable 10 as in the above-described embodiment, Even if the diameter of 10 is different, the same sealing packing 20 can be used).

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

<About Sealing Structure 1>
The aforementioned sealing structure 1 was provided immediately downstream of the closure 8. However, the place where the sealing structure 1 is provided is not limited to such a place. For example, the sealing case 2 may be disposed on the ground dam 9 (see FIG. 1) that seals the gas at the end of the cable 10. In this case, since the purpose is to seal the gas at the end of the cable 10, the bypass structure 4 is not necessary for the sealing structure 1.

<About cable 10>
The cable 10 described above is composed of a number of metal core wires 11, a presser winding 12, an aluminum tape 14, and an outer jacket 15. However, the cable 10 is not limited to this configuration. For example, the cable may include an optical fiber core wire, or a film or the like may be disposed inside or outside the presser winding. Moreover, the cable does not need to be provided with presser winding or aluminum tape.
Moreover, although the above-mentioned cable 10 was a cable capable of gas maintenance, the cable to which the sealing structure is attached may not be a cable capable of gas maintenance. The above-described sealing structure may be provided on the cable for the purpose of protecting the outer jacket removal portion of the cable and water stopping of the cable.

<About the case body 30>
The case main body 30 described above is composed of two cases (an upper case 31 and a lower case 32), and these two cases are arranged so as to sandwich the sealing packing 20 therebetween. However, the number of cases constituting the case body 30 is not limited to two, and may be three or more. Even in the case where the case main body 30 is constituted by three or more cases, if the spring (elastic member) absorbs the expansion / contraction of the sealing portion 3, the force for pressing the sealing portion 3 can be maintained.

  Further, the case main body 30 is not limited to one constituted by a plurality of cases, and may be constituted by one case. For example, instead of connecting the upper case 31 and the lower case 32 in FIG. 13 with a hinge, a single C-shaped case in which the upper case 31 and the lower case 32 are integrated may be used. In this case, after the resin is cured in the internal space 21 of the sealing packing 20 to form the sealing portion 3, the C-shaped case is deformed by further tightening the adjustment screw 333 and further tightening. If the interval between the parts is narrowed, the resin (sealing part 3) cured in the sealing packing 20 can be pressed and the sealing function of the sealing part 3 can be maintained.

<About elastic members>
The aforementioned spring 332 was disposed in a state of being compressed and deformed. However, you may comprise the case main body 30 so that the deformation of the sealing part 3 may be absorbed using the extended spring.

1 sealing structure, 2 sealing case, 3 sealing part,
4 Bypass section, 5 Bypass case,
6 Bypass pipe, 7 Check valve,
8 closures, 9 ground dams,
10 cables, 11 metal cores, 12 presser windings,
13 LAP sheath, 14 aluminum tape, 15 jacket,
17 skin removal part, 19 skin removal part,
20 sealing packing, 21 internal space,
22 slits, 23 holes, 24 ends,
27 air tight tape, 30 case body,
31 Upper case, 311 Semi-cylindrical part,
311A hole, 312 edge,
32 lower case, 321 semi-cylindrical part, 322 edge,
33 Spring mechanism, 331 mount, 332 spring,
333 adjustment screw, 334 shaft screw,
35 pipe joints, 36 joint nipples,
38 gripping tool, 381 upstream gripping part, 382 downstream gripping part,
382A side wall part, 383 connecting part,
50 Bypass packing, 57 Air tight tape,
60 bypass case body, 61 upper bypass case,
611 semi-cylindrical part, 612 edge,
62 Lower bypass case, 621 semi-cylindrical part, 622 edge,
63 fixing screw, 65 fitting,
66 Joint for bypass, 661 Pressure measuring valve,
68 gripping part, 681 upstream gripping part,
682 downstream gripping part, 683 coupling part,
71 T-type valve, 72 ground wire, 73 ground wire

Claims (7)

A packing that covers the periphery of the cable from which the jacket has been removed, the packing that can cure the resin filled in the inner space and form a sealing portion in the removed portion of the jacket,
A sealing structure including a case main body for compressing the packing and sealing the internal space,
The case body has an elastic member, and absorbs deformation of the sealing portion by elastic deformation of the elastic member. The sealing structure according to claim 1,
The case main body includes an adjustment unit that adjusts an elastic deformation amount of the elastic member. The sealing structure according to claim 1 or 2,
The case body has two cases sandwiching the packing,
A sealing structure that absorbs a change in a distance between the two cases by elastic deformation of the elastic member. The sealing structure according to claim 3,
Having a gantry and screws,
The space between the frame and the case opposite to the frame is fixed by the screw,
A sealing structure characterized in that the elastic member can be compressed and deformed between the gantry and the case on the gantry side. A sealing structure according to any one of claims 1 to 4,
The sealing structure further comprising a bypass portion that bypasses the sealing portion and flows gas to the cable on the downstream side. Removing the cable jacket;
Covering the periphery of the removed portion of the jacket with packing, and sealing the inner space of the packing with a case body having an elastic member capable of absorbing deformation of the packing;
Filling the internal space with resin and curing the resin to form a sealing portion;
The manufacturing method of the sealing structure characterized by having. It is a manufacturing method of the sealing structure according to claim 6,
After forming the sealing part, the method further includes a step of compressing and deforming the elastic member and pressing the sealing part with the case main body.

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