JP5089328B2 - Power cable connection section and configuration method thereof - Google Patents

Description

  The present invention relates to a power cable connecting portion in which power cables are connected to each other and a method of configuring the power cable connecting portion.

  The cable connection body that connects power cables to which high voltage or ultra-high voltage is applied is the conductor connection part where the conductors of the power cable are connected via the connection fittings, the periphery of the conductor connection part so as to reduce the electric field The cable connection part main body comprised by the reinforcement insulation layer of the electric field control structure which controls electric field distribution of this, a shielding layer, a water shielding layer, etc., and the protective exterior part which covers this cable connection part main body.

  When a large external force may act on the cable, such as when the power cable is directly buried underground, as shown in Patent Document 1 and Patent Document 2, use a mechanically strong material such as FRP. A constructed so-called coffin box is attached to the cable connection unit body at the construction site, the cable connection unit body is accommodated in the coffin box, and protection is provided by injecting a waterproof compound such as urethane resin into the coffin box. The exterior part is constituted.

  The coffin box shown in Patent Document 1 is divided into two halves as in the middle, and has a structure in which flanges formed at opposite ends of the two halves are joined together. . In this type of coffin box, in order to ensure waterproof performance, the flange portions of the two halves are brought into contact with each other via a packing and fastened with a large number of bolts.

Moreover, as shown in Patent Document 2, a cylindrical coffin box including a cylindrical coffin box body having both ends opened and a flange plate that closes both ends of the coffin box body is also used. In this coffin box, cables are introduced into the coffin box through openings formed in flange plates that close both ends of the coffin box body. Also in this case, a waterproof compound such as urethane resin is injected into the coffin box.
JP 2003-087920 A JP-A-2005-253122

  In the co-fin box having a split structure shown in Patent Document 1, it is necessary to fasten the flanges formed at opposite ends of the two halves constituting the box with a large number of bolts. It was necessary to make it thicker.

  In addition, in the conventional two-split structure coffin box, the two half flanges constituting the box are fastened by a large number of bolts, so it is necessary to form a large number of holes for passing the bolts through each flange. Couldn't avoid being troublesome.

  In addition, in the conventional split-type coffin box, it was necessary to insert packing between the two half flanges in order to ensure waterproofness. Combined with the troublesome drilling process, the cost was inevitable.

  In addition, in a structure that uses two bolts to tighten the flanges of two halves that are abutted through packing, as in a conventional two-part coffin box, the packing works only if the tightening force of each bolt is not uniform. As a result, the waterproofness of the coffin box may be uneven if the skill of the coffin box is insufficient.

  In the cylindrical coffin box shown in Patent Document 2, the ground wire connected to the shielding layer of the power cable is drawn out from the end of the coffin box. In this case, the ground wire lead portion is waterproofed. In order to make this possible, it is necessary to secure a gap between the ground wire lead portion and the power cable, so the inner diameter of the coffin box is considerably larger than the outer diameter of the cable connection body. The amount of waterproofing compound that fills the gap in the coffin box is increased, and the cost is unavoidable.

  An object of the present invention is to provide a power cable connecting portion and a method of configuring the same that can assemble a coffin box without using bolts.

  Another object of the present invention is to make it possible to assemble a coffin box without using bolts, and to save the amount of waterproofing compound filling the inside of the coffin box, and It is to provide a configuration method thereof.

  The present invention relates to a power cable connecting portion including a cable connecting portion main body in which a plurality of power cables are connected to each other and a coffin box that accommodates the cable connecting portion main body, and the waterproof compound is filled in the coffin box. is there.

  In the present invention, the coffin box is divided into a plurality of box constituent members, and adjacent box constituent members are in contact with each other at each divided portion. A resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across adjacent box constituent members that are abutted at each divided portion, and the resin impregnated in the resin-impregnated sheet that covers the vicinity of each divided portion is cured. Thus, the resin-impregnated sheet is bonded to the outer surface of the adjacent box constituent member that is abutted at each divided portion, and the abutting portions of the plurality of box constituent members are joined via the resin-impregnated sheet.

  In order to prevent an increase in the number of parts, the coffin box is preferably divided into two box components. However, for the purpose of facilitating the molding of the box components, the coffin box is divided into three or more box components. It can also be divided into

  As described above, a resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across the adjacent box constituent members that are abutted at each divided portion of the coffin box having a divided structure, and is abutted at each divided portion. By adhering the resin-impregnated sheet to the outer surface of the adjacent box-constituting member, it is possible to connect the butted portions of the plurality of box-constituting members via the resin-impregnated sheet. Since the coffin box can be assembled without interposing the packing at the butting portion and the structure can be simplified, the cost of the coffin box can be reduced.

  Furthermore, when comprised as mentioned above, since it joins in the state which covered the butt | matching part of the box structural member completely with the resin impregnation sheet | seat, the waterproofness of a coffin box can be improved and it prevents it being immersed in a coffin box. be able to.

  Moreover, if comprised as mentioned above, a box component can be joined liquid-tightly only by arrange | positioning the resin impregnation sheet | seat so that the butt | matching part of a box component may be covered, and hardening the impregnated resin, As in the case of joining the joints with bolts, there is no difference in the sealing performance of the joint parts of the coffin box depending on the level of skill of assembly work, so the power cable connection part with uniform quality that is always highly waterproof Can be obtained.

  In general, since the ground wire connected to the shield layer of the cable connected by the cable connection body is led out from the cable connection body of the power cable, the ground wire lead out from the ground to the coffin box. Parts are provided. The coffin box is filled with a waterproof compound.

  As described above, when the ground wire lead-out portion is provided in the coffin box, the ground wire is provided on the peripheral wall portion of one box constituent member facing the ground wire among the plurality of box constituent members constituting the coffin box. A bulging portion having a concave portion to receive inside is formed, and a ground wire lead portion is provided in the one box component so as to face the concave portion, and the ground wire is drawn out from the ground wire lead portion through the concave portion. Is preferred.

  Also in this case, the joint structure of the box constituent members constituting the coffin box is the same as described above. That is, a resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across adjacent box constituent members that are abutted at each divided portion, and the resin impregnated in the resin-impregnated sheet that covers the vicinity of each divided portion is cured. Thus, the resin-impregnated sheet is bonded to the outer surface of the adjacent box constituent member that is abutted at each divided portion, and the abutted portions of the plurality of box constituent members are joined via the resin-impregnated sheet.

  As described above, a bulging portion having a concave portion for receiving the grounding wire is formed on the peripheral wall portion of one box constituent member facing the grounding wire, and the grounding wire is drawn out from the grounding wire lead-out portion through the concave portion. With the structure, since the portion other than the bulging portion of the peripheral wall portion of one box constituent member facing the grounding wire can be brought close to the cable connecting portion main body, compared to the case where the bulging portion is not provided, The volume in the box can be reduced. Therefore, the amount of the waterproof compound filled in the coffin box can be reduced, and the waterproof compound can be saved.

  In order to increase the bonding strength of the box constituent member, it is preferable to use a resin-impregnated sheet obtained by impregnating a glass fiber woven fabric or nonwoven fabric with a resin.

  As mentioned above, if a resin-impregnated sheet is made by impregnating a glass fiber woven or nonwoven fabric with resin, the strength of the joint part of the coffin box can be increased, so that it can be buried directly in the ground. A connecting portion of the power cable that can be obtained can be easily obtained.

  As the resin to be impregnated into the sheet, it is preferable to use a thermosetting resin that cures by temperature, a resin that cures by mixing two liquids, a photocurable resin that cures by irradiation with ultraviolet rays or electron beams, and the like. In particular, it is preferable to use an ultraviolet curable resin.

  If a photo-curable resin is used as the resin to be impregnated into the sheet, the resin can be cured in a short time just by irradiating the sheet with natural light or an electron beam, so that the resin can be easily cured. The assembly work efficiency of the power cable connecting portion can be improved. In addition, the curing time may be adjusted by varying the temperature.

  The present invention is also applied to a method of configuring a power cable connecting portion by configuring a cable connecting portion main body in which a plurality of power cables are connected, and then housing the cable connecting portion main body in a coffin box.

  In the configuration method of the power cable connecting portion according to the present invention, the coffin box is divided into a plurality of box constituent members and has a structure in which adjacent box constituent members are abutted at each divided portion. After the part main body is configured, the plurality of box constituent members are brought into contact with each other in a state where the cable connecting part main body is disposed inside the plurality of box constituent members. Next, a resin impregnated sheet is arranged so as to cover the vicinity of each divided portion from the outside across the adjacent box constituent members abutted at each divided portion, and the resin impregnated in the resin impregnated sheet covering the vicinity of each divided portion is provided. By curing, the resin impregnated sheet is bonded to the outer surface of the adjacent box constituent member that is abutted at each divided portion, and the abutted portions of the plurality of box constituent members are joined via the resin impregnated sheet.

  According to the above method, since the coffin box can be assembled without performing the work of tightening a large number of bolts, the configuration of the power cable connecting portion can be facilitated. In addition, just by placing a resin-impregnated sheet so as to cover the butted portion of the box component member and curing the resin, the box component member can be joined in a liquid-tight manner, as in the case where the box component member is joined with a bolt. Because there is no difference in the sealing performance of the joint due to the tightening of the bolt, the sealing performance of the joint of the coffin box can always be made uniform without requiring a high level of skill of the operator. It is possible to easily obtain a high-quality power cable connection portion in which there is no risk of water intruding into the interior.

  The present invention also comprises a cable connection unit body in which a plurality of power cables are connected to each other, and after drawing out a ground wire connected to a shielding layer of the plurality of power cables, the cable connection unit body is accommodated in a coffin box to It is applied to the method of configuring the cable connection part.

  In this case, the coffin box is divided into a plurality of box constituent members and has a structure in which adjacent box constituent members are abutted at each divided portion. A bulging portion having a concave portion for receiving a grounding wire inside is formed on the peripheral wall portion of one box constituent member facing, and a grounding wire lead-out portion is provided in the one box constituent member so as to face the concave portion. . Then, after configuring the cable connection unit main body, the ground wire is pulled out from the lead-out part through the recess of one box component member, and the plurality of cable connection unit main bodies are arranged inside the plurality of box component members. The box constituent members are abutted. Next, a resin impregnated sheet is arranged so as to cover the vicinity of each divided portion from the outside across the adjacent box constituent members abutted at each divided portion, and the resin impregnated in the resin impregnated sheet covering the vicinity of each divided portion is provided. By curing, the resin impregnated sheet is bonded to the outer surface of the adjacent box constituent member that is abutted at each divided portion, and the abutted portions of the plurality of box constituent members are joined via the resin impregnated sheet.

  As described above, according to the present invention, the resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across adjacent box constituent members that are abutted at each divided portion of the coffin box having a divided structure, Since the resin-impregnated sheet is bonded to the outer surface of the adjacent box component member that is abutted at the divided portion, each abutting portion of the plurality of box component members is joined via the resin-impregnated sheet, so that a bolt is used. And the coffin box can be assembled without interposing a packing at the abutting portion of the box constituent member. Therefore, the structure of the coffin box can be simplified, and the cost of the coffin box can be reduced.

  According to the present invention, since the butted portion of the box constituent member can be joined in a state of being completely covered with the resin-impregnated sheet, the waterproofness of the coffin box can be improved and water can be prevented from entering the coffin box. be able to.

  Furthermore, according to the present invention, the box constituent member can be liquid-tightly joined simply by placing the resin-impregnated sheet so as to cover the butted portion of the box constituent member and curing the resin. As in the case of joining the parts with bolts, it is possible to prevent a difference in the sealing performance of the joined parts depending on the skill level of the assembly work, and it is possible to constitute a power cable connecting part with always uniform quality.

  In the present invention, when the ground wire is pulled out from the cable connecting portion main body, a bulging portion having a concave portion for receiving the ground wire is formed on the peripheral wall portion of one box component member facing the ground wire, and the ground wire When the structure is drawn out from the ground wire lead portion through the recess, the portion other than the bulging portion of the peripheral wall portion of one box component member facing the ground wire can be brought close to the cable connection portion main body. Therefore, the volume in the coffin box can be reduced as compared with the case where no bulging portion is provided. Therefore, the amount of the waterproof compound filled in the coffin box can be reduced, and the waterproof compound can be saved.

  In the present invention, when the resin-impregnated sheet used is a glass fiber woven or non-woven fabric impregnated with a resin, the strength of the joint part of the coffin box can be increased, so it is directly embedded in the ground. It is possible to easily obtain a power cable connecting portion.

  In the present invention, when a resin to be impregnated in the sheet is a temperature curable resin that cures by temperature, a photo curable resin that cures by irradiation with ultraviolet rays or an electron beam, particularly an ultraviolet curable resin. Since the resin can be cured in a short time just by irradiating the sheet with light or an electron beam, the resin can be easily cured, and the assembly work efficiency of the power cable connecting portion can be improved. . In addition, the curing time can be adjusted by varying the temperature.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a front view of a power cable connecting portion in a state before sealing a cable lead-out portion from a coffin box, and FIG. FIG. 3 is a front longitudinal sectional view of the power cable connecting portion after sealing the cable lead-out portion from the coffin box, FIG. 3 is a transverse sectional view showing FIG. 2 along the line III-III, and FIG. It is a right view of FIG.

   In these drawings, 1 and 2 are two power cables connected to each other, and 3 is a cable connecting portion main body for connecting the power cables 1 and 2. The power cables 1 and 2 are accommodated in the protective pipes 3 and 4 whose peripheral walls are corrugated so as to withstand the earth pressure applied when buried directly in the basement.

  The cable connection unit body 3 includes a conductor connection unit in which the conductors of the power cables 1 and 2 are connected to each other via a connection fitting, and an electric field control structure that controls the electric field distribution around the conductor connection unit so as to reduce the electric field. It is comprised by an insulating layer, a shielding layer, a water shielding layer, etc. The reinforcing insulating layer is composed of a rubber block insulator (RBJ), an epoxy premolded insulator composite (PJ), a tape winding (TJ), or the like.

  Reference numeral 6 denotes a ground line made of a coaxial cable. A center conductor 6 a of the ground line is connected to the shielding layer of the cable 1, and a shield conductor 6 b of the ground line 6 is connected to the shielding layer of the cable 2. Reference numeral 10 denotes a substantially cylindrical coffin box made of FRP (fiber reinforced plastic), and a pair of cable lead-out portions 10a sharing a central axis on one end and the other end of the coffin box 10 in the axial direction. 10a is integrally formed. On the end face of the other end in the axial direction of the coffin box 10, a lead-out portion 10b for drawing out the ground wire is formed so as to be aligned with the lead-out portion 10a. The cable lead-out portions 10a and 10a and the ground wire lead-out portion 10b are located eccentrically with respect to the central axis of the coffin box, and are centered on one plane including the central axis of the coffin box. It is provided so as to have an axis.

  Two holes 10c and 10c are formed in a portion of the peripheral wall portion of the coffin box 10 located on the opposite side of the cable lead-out portions 10a and 10a with a gap in the axial direction of the coffin box. Short pipes 10d and 10d are joined around the openings to the outside of these holes 10c and 10c, respectively, and the openings of the short pipes 10d and 10d serve as compound injection ports 12 and 12, respectively. Caps 10e and 10e are covered on the outer circumferences of the short tubes 10d and 10d.

  The coffin box 10 is divided into a first box constituting member 10A and a second box member 10B on both sides of a split surface formed of a single plane including the central axis of the cable lead-out portions 10a, 10a. The opposing end portions of the box constituent members 10A and 10B are brought into contact with each other at two divided portions 11 and 11 (see FIGS. 1 and 3) formed at a portion intersecting with the divided surface of the peripheral wall portion of the box.

  In the illustrated example, one box constituent member provided with the compound inlets 12 and 12 is a first box constituent member 10A, and the other box member is a second box constituent member 10B.

  When configuring the power cable connecting portion, after configuring the cable connecting portion main body 3 in which the power cables 1 and 2 are connected, the cable connecting portion main body 3 is disposed on the second box constituting member 10B. The cables 1 and 2 covered with the protective tubes 4 and 5 are placed on the half portions of the cable drawing-out portions 10a and 10a formed at both ends of the two box constituent members 10B. Next, after the ground wire 6 is inserted into the ground wire lead-out portion 10b of the first box constituent member 10A and penetrated through the lead portion 10b, the ground wire 6 rides on the second box constituent member 10B. The first box constituent member 10A is put on the cable connection portion main body 3 and the cables 1 and 2 that are present, and the opposite end portions of the first box constituent member 10A and the second box constituent member 10B are brought into contact with each other.

  Next, the resin impregnated sheet 15 that covers the vicinity of each divided portion 11 from the outside is disposed along the outer surface of the box constituting members 10A and 10B across the box constituting members 10A and 10B faced by each divided portion 11, By curing the resin impregnated in the resin-impregnated sheet 15 that covers the vicinity of each divided portion 11, the resin-impregnated sheet 15 is bonded to the outer surfaces of the box constituent members 10A and 10B that are abutted at each divided portion. Thereby, each butt | matching part of box structural member 10A, 10B is joined via a resin impregnation sheet | seat. As shown in FIGS. 1 and 4, the resin-impregnated sheet 15 completely covers the entire divided portion 11 of the coffin box 10 (the divided portions 11 and the cables formed on the end faces of both ends of the coffin box 10. Provided so as to cover the divided portions 11 formed in the drawing-out portions 10a, 10a), and the entire butted portions of the box constituent members 10A, 10B are liquid-tightly sealed.

  After joining the divided part 11 of the coffin box as described above, the waterproof tape 16 is wound around the outer periphery of the cable lead-out parts 10a and 10a and the protective tubes 4 and 5 led out from the lead-out part, A waterproof tape 17 is wound around the outer periphery of the lead-out portion 10b for drawing out the ground wire and the outer periphery of the ground wire 6 led out from the lead-out portion, and the lead-out portion of the cable and the lead-out portion of the ground wire are sealed in a liquid-tight manner.

  After assembling the coffin box 10 as described above, a waterproof compound 18 such as urethane resin is injected into the coffin box from the compound injection port 12 of the coffin box. Thereafter, the cap 10e is put on the short tube 10d to close the compound injection port 12, and the cap 10e and the short tube 10d are sealed liquid-tightly by an appropriate means such as adhesion.

  As described above, with the coffin box as a divided structure, a resin-impregnated sheet that covers the vicinity of each divided portion 11 from the outside is disposed across adjacent box constituent members 10A and 10B that are abutted at each divided portion of the coffin box. The bolts are used when the abutting portions of the box constituent members are joined to each other through the resin impregnated sheets by adhering the resin impregnated sheets 15 to the outer surfaces of the adjacent box constituent members abutted at the divided portions. In addition, since the coffin box can be assembled without interposing a packing at the abutting portion of the box constituent member, the structure of the coffin box 10 can be simplified, and the cost of the coffin box can be reduced. .

  Moreover, when comprised as mentioned above, since it can join in the state which covered the butt | matching part of box structural member 10A, 10B completely with the resin impregnation sheet | seat, the waterproofness of a coffin box can be improved, and water is in a coffin box. It can be surely prevented from entering.

  Further, when configured as described above, the box constituent members 10A and 10B can be joined in a liquid-tight manner simply by placing the resin impregnated sheet 15 so as to cover the butted portions of the box constituent members 10A and 10B and curing the resin. Therefore, it is possible to prevent differences in the sealing performance of the joints depending on the skill level of the assembly work, as in the case where the joints of the box component members are joined by bolts, and the power cable connection part with always uniform quality. Can be configured.

  As the resin-impregnated sheet 15, it is preferable to use a glass fiber woven or non-woven fabric impregnated with a resin. When such a resin-impregnated sheet is used, the strength of the joint portion of the coffin box 10 can be increased, so that a power cable connection portion that can be directly buried in the ground can be easily obtained.

  As a sheet constituting the resin-impregnated sheet, a chopped strand mat widely used as a reinforcing material for FRP (a strand cut shortly is dispersed uniformly in a random direction and bonded in a mat shape with a binder. Sheet) is preferably used. The chopped strand mat has a uniform strength along all directions, good resin impregnation, and familiarity with the mold.Therefore, the gap between the butted parts follows the curved surface of the outer surface of the box component. Suitable for plugging.

  In order to facilitate the curing of the impregnated resin, it is preferable to use a photo-curing resin as a resin impregnated in the resin-impregnated sheet 15 with a short curing time. That is, as the resin-impregnated sheet, it is most preferable to use a glass fiber sheet in which a chopped strand mat is impregnated with a photocurable resin.

  In an experiment conducted by the present inventors, an AFR sheet (trade name) manufactured by Asahi Kasei Geotech Co., Ltd. (thickness of 1 mm), which is a resin-impregnated sheet obtained by impregnating a chopped strand mat with an ultraviolet curable resin, was used. As a result, it was possible to obtain a power cable connection portion that can sufficiently withstand the earth pressure acting when buried in the ground. When an AFR sheet was used, the time required for the resin to cure was about 15 minutes when ultraviolet rays contained in sunlight were used. When assembling the coffin box in an underground cave or indoors where sunlight does not reach, it is appropriate to use an ultraviolet fluorescent lamp as a light source used for curing an ultraviolet curable resin.

  FIG. 5 shows a second embodiment of the present invention. In this example, the first box constituent member 10A facing the ground wire 6 out of the box constituent members 10A ′ and 10B ′ of the coffin box 10 ′ having a divided structure divided into two as in the first embodiment. A bulging portion 10g having a concave portion 10f for receiving a grounding wire on the inner side is formed on the peripheral wall portion of ′. Although not shown, a ground wire lead portion is provided at the end of the box constituent member 10A so as to face the concave portion 10f, and the ground wire 6 is drawn out from the ground wire lead portion through the concave portion 10f. Similarly to the first embodiment, the ground wire lead portion is constituted by a lead portion formed at the end of the first box constituting member 10A ′. The other points are configured in the same manner as in the first embodiment.

  As described above, a bulging portion 10g having a concave portion 10f for receiving the ground wire 6 inside is formed on the peripheral wall portion of one box constituent member facing the ground wire 6, and the ground wire is drawn through the concave portion 10f. If the structure is drawn out from the outside, the portion other than the bulging portion of the peripheral wall portion 10h of the box constituent member 10A 'facing the grounding wire 6 can be brought close to the cable connecting portion main body 3, so that the bulging portion 10g Compared with the case where no is provided (the case according to the first embodiment), the volume in the coffin box can be reduced. Therefore, the amount of the waterproof compound 18 filled in the coffin box can be reduced, and the cost can be reduced by saving the waterproof compound.

  FIG. 6 shows a third embodiment of the present invention. In this embodiment, instead of a cylindrical coffin box, a cylindrical body having a flat shape in which the contour shape of the cross section is almost elliptical is shown. A middle-sized coffin box 10 ″ having a divided structure is used. Cable ends 10a ″ and 10a ″ are formed at one end and the other end of the coffin box 10 ″, and the other end of the coffin box 10 ″. Is formed with a lead-out portion 10b ″ for drawing out the ground wire. Further, a compound injection port closed by a cap 10e ″ is provided on the peripheral wall portion of the coffin box.

  The coffin box 10 ″ is divided into a first box constituent member 10A ″ and a second box constituent member 10B ″ at a split portion 11 ″ along a split surface including the central axis of the lead portions 10a ″ and 10a ″ for leading out the cables. Has been. Similar to the first embodiment, the resin impregnated sheet 15 covering the divided parts straddling the box constituent members 10A ″ and 10B ″ faced by the divided parts is formed on the outer surfaces of the box constituent members 10A ″ and 10B ″. The resin impregnated in the resin impregnated sheet 15 is cured and the resin impregnated sheet 15 is adhered to the outer surfaces of the box constituent members 10A ″ and 10B ″ that are abutted at each divided portion. The butted portions of the constituent members 10 </ b> A ″ and 10 </ b> B ″ are joined via the resin impregnated sheet 15.

  The embodiment shown in FIG. 6 is a conductor connection in which cable conductors are connected to each other in a rubber insulating cylinder in which a semiconductive stress cone and a reinforcing insulating cylinder are molded inside and a semiconductive layer is formed on the outer surface. By arranging the portions, it is useful when the cable connection portion main body is configured compactly, such as when the cable connection portion main body is configured. When the coffin box as shown in FIG. 6 is used, the internal volume can be reduced, so that the waterproof compound can be saved.

  A rubber insulating cylinder for a cable connection portion in which a semiconductive stress cone or a reinforced insulating cylinder is molded inside and a semiconductive layer is formed on the outer surface is disclosed in, for example, JP-A-2005-12933. It is well known.

  In each of the above embodiments, the coffin box is divided into two box constituent members, but the present invention can also be applied to a case where the coffin box is divided into three or more box constituent members.

  Moreover, you may provide the resin impregnation sheet | seat so that the substantially whole coffin box may be covered. The resin-impregnated sheet may also be provided across the cable drawer and the power cable.

  In the above description, the power cable connecting portion is directly buried in the ground, but it may be arranged in a cave, a manhole, or the like.

In the 1st Embodiment of this invention, it is the front view which showed the power cable connection part in the state before performing the sealing of the cable drawer part from a coffin box. In the 1st Embodiment of this invention, it is the front longitudinal cross-sectional view which showed the electric power cable connection part after sealing the cable extraction part from a coffin box. FIG. 3 is a cross-sectional view of FIG. 2 taken along line III-III. It is a right view of FIG. It is sectional drawing equivalent to FIG. 3 of the 2nd Embodiment of this invention. In the 3rd Embodiment of this invention, it is the front view which showed the power cable connection part in the state before performing the sealing of the cable extraction part from a coffin box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Electric power cable 3 Cable connection part main body 6 Grounding wire 10 Coffin box 10A, 10B Box component 11 Dividing part 15 Resin impregnation sheet 18 Waterproof compound

Claims (8)

A power cable connecting portion comprising a cable connecting portion main body in which a plurality of power cables are connected, and a coffin box that accommodates the cable connecting portion main body, wherein the coffin box is filled with a waterproof compound,
The coffin box is divided into a plurality of box constituent members and has a structure in which adjacent box constituent members are abutted at each divided portion,
A resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across adjacent box constituent members that are abutted at each divided portion,
The resin impregnated in the resin-impregnated sheet covering the vicinity of each divided portion is cured, so that the resin-impregnated sheet is bonded to the outer surface of the adjacent box constituent member abutted at each divided portion, and the plurality of box constituent members Each butted portion is bonded via the resin-impregnated sheet,
Power cable connection characterized by. A cable connecting portion main body connecting a plurality of power cables, and a coffin box that accommodates the cable connecting portion main body, and a ground wire connected to a shielding layer of the cable connected by the cable connecting portion main body is connected to the coffin box. A power cable connecting portion that is drawn to the outside through the provided ground wire lead-out portion and is filled with a waterproof compound in the coffin box;
The coffin box is divided into a plurality of box constituent members and has a structure in which adjacent box constituent members are abutted at each divided portion,
Among the plurality of box constituent members, a bulging portion having a concave portion for receiving the grounding wire is formed on the peripheral wall portion of one box constituent member facing the grounding wire, and the bulging portion faces the concave portion. The ground wire lead portion is provided in one box component,
The ground wire is drawn out from the ground wire lead portion through the recess,
A resin-impregnated sheet that covers the vicinity of each divided portion from the outside is disposed across adjacent box constituent members that are abutted at each divided portion,
The resin impregnated in the resin-impregnated sheet covering the vicinity of each divided portion is cured, so that the resin-impregnated sheet is bonded to the outer surface of the adjacent box constituent member abutted at each divided portion, and the plurality of box constituent members Each butted portion is bonded via the resin-impregnated sheet,
Power cable connection characterized by.   The power cable connecting portion according to claim 1 or 2, wherein the resin-impregnated sheet is made of a glass fiber woven or non-woven fabric impregnated with a resin.   The power cable connecting portion according to claim 1, wherein the resin is a photocurable resin. In the method of configuring the power cable connection part by housing the cable connection part main body in a coffin box after configuring the cable connection part main body connecting a plurality of power cables.
As the coffin box, one having a structure in which adjacent box constituent members divided into a plurality of box constituent members are abutted at each divided portion,
After configuring the cable connection portion main body, the plurality of box component members are abutted in a state where the cable connection portion main body is disposed inside the plurality of box component members,
A resin impregnated sheet is arranged so as to cover the vicinity of each divided portion from the outside across adjacent box constituent members that are faced at each divided portion,
By curing the resin impregnated in the resin-impregnated sheet covering the vicinity of each divided part, the resin-impregnated sheet is adhered to the outer surface of the adjacent box constituent member abutted at each divided part, and the plurality of box constituent members After joining each butted portion of the resin impregnated sheet, injecting a waterproof compound into the coffin box,
A method for configuring a power cable connecting portion. After constructing a cable connecting portion main body connecting a plurality of power cables and drawing out a ground wire connected to the shielding layer of the plurality of power cables, the cable connecting portion main body is accommodated in a coffin box and the power cable connecting portion In the method of configuring
The coffin box is divided into a plurality of box constituent members and has a structure in which adjacent box constituent members are abutted with each other at each divided portion. A bulging portion having a recess for receiving the grounding wire inside is formed in a peripheral wall portion of the one box component member, and a grounding wire for drawing out the grounding wire so as to face the inside of the recess portion in the one box component member Set up a drawer,
After configuring the cable connection portion main body, the ground wire is pulled out from the lead-out portion through the recess of the one box component member, and the cable connection portion main body is disposed inside the plurality of box component members. In this state, the plurality of box components are abutted,
A resin impregnated sheet is arranged so as to cover the vicinity of each divided portion from the outside across adjacent box constituent members that are abutted at each divided portion,
By curing the resin impregnated in the resin-impregnated sheet covering the vicinity of each divided part, the resin-impregnated sheet is adhered to the outer surface of the adjacent box constituent member abutted at each divided part, and the plurality of box constituent members After joining each butted portion of the resin impregnated sheet, injecting a waterproof compound into the coffin box,
A method for configuring a power cable connecting portion. The method for configuring a power cable connecting portion according to claim 5 or 6 , wherein a glass fiber woven or non-woven fabric impregnated with a resin is used as the resin-impregnated sheet.   The method for configuring a power cable connecting portion according to claim 5, 6 or 7, wherein a photo-curing resin is used as the resin.

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