JP4912811B2 - Branch connection box - Google Patents

Description

  The present invention relates to a branch connection box for high-voltage power cables, such as a branch connection box for 6.6 kV, CVT cables, and a housing structure thereof.

  As the conventional junction box for 6.6 kV, CVT cable, as shown in FIG. 7 (photograph), two types of ground installation (self-standing type) and wall surface installation (wall hanging type) have been used. 7 has means for branching and connecting the high-voltage power cable inside the casing, and a terminal connection diagram of “main line-branch line-main line” (see FIG. 3). Has a connection configuration in which “E” is rotated by 90 degrees.

  Of the two types of branch junction boxes shown in FIG. 7, the self-standing branch junction box has the ground mounting angles fixed on both sides of the bottom of the side cover with the sides facing outward on both sides of the lower part of the casing. Then, the casing is fixed to the foundation of the ground using the bolt holes provided in the angle. On the other hand, in the wall-mounted branch junction box, mounting brackets for fixing the wall surface are fixed to the casing at four locations on the upper and lower sides of the upper surface of the casing, and the casing is fixed to the wall surface using the mounting bracket. It was a structure. The branch junction boxes are provided at intervals of about 400 m along the railroad tracks. The reason for providing this every 400 m is that the maximum length of the CV cable wound around the drum is about 400 m. Therefore, a connection box is provided for each of these lengths to store the cable connection portion, It is used for the purpose of protection, maintenance of performance, and improvement of maintenance and inspection.

The above-described branch connection box for high-voltage power cables has the following problems.
1) As for the installation form of branch junction box, it is difficult to have an accurate inventory beforehand because the customer performs system design after field survey and decides which type to use individually. Due to the production, meeting the delivery date was a problem.
2) In the self-standing type and wall-mounted type, the mounting bracket protrudes outward from the housing, so there is a risk of injury due to rolling or hooking, which is a problem in terms of safety in installation work.
3) Since all cases were made to order and manufactured individually, mass production could not be achieved, resulting in a cost increase and a chronic delivery delay.

  The present invention has been made in view of the problems of the conventional junction box for a high-voltage power cable and the housing structure thereof as described above, and the inventory is achieved by making the self-standing type and the wall-mounted type common. An object is to provide a branch connection box for a high-voltage power cable and its housing structure that enables production, establishes an immediate delivery system regardless of the installation method, and realizes a significant cost reduction.

In order to solve the above-mentioned problems, the branch junction box according to the present invention uses the following means.
(1) A branch connection box comprising a case, a branch connection means for a cable disposed inside the case, and a case attachment means for attaching the case to an external object,
The housing is
A frame solid formed by combining four vertical frames and a square frame-shaped horizontal frame into a cubic shape;
A lid attached to the upper part thereof;
With a bottom frame attached to its lower part,
A front cover that can be detachably or removably attached to the front surface;
A back cover attached to the back side,
Two side covers that are detachably or removably attached to the left and right sides;
With
The housing mounting means is
In order to install the housing in a self-supporting state (install on the ground), self-supporting attachment means provided on the bottom frame;
In order to install the housing in a wall-mounted state (installed on the wall surface), wall-mounted attachment means provided on the back cover;
The two means are configured.

(2) In the branch connection box of (1),
The bottom frame of the housing is provided so as to be positioned below the side cover of the housing, and has a bolt hole and a fixing member for self-standing installation with an external object,
By the fixing member, the bottom frame at the lower part of the casing is fixedly mounted on the external object, and the casing is self-supported.
(3) In the branch connection box of (1),
The back panel of the housing includes a mounting hole and a fixing member for wall mounting with an external object,
By the fixing member, a back panel on the back surface of the housing is fixed and fixed to the external object,
The housing is mounted on the wall.

Moreover, the following means can also be used for the branch junction box by this invention.
(A) The lid to which the case lifting bracket is fixed is fixed to a frame made of equal or unequal angle irons (hereinafter referred to as angle steel) at the upper part of the case, and both side surfaces of the case and the lower front panel are attached and detached. The front and upper panels of the front and rear panels are configured to be freely openable and closable by a hinge connection, and the front upper panel is configured to be freely openable and closable.

(B) In the casing structure of the branch junction box of (a),
For self-supporting installation, a bottom frame made of angle steel with bolt holes for mounting the stand is provided on the bottom of both sides of the chassis frame, facing the inside of the chassis, and the bottom frame is installed This is a case structure of a branch connection box characterized in that it is fixed to a pedestal provided on site with a bolt device or the like.

(C) In the casing structure of the branch connection box of (a) or (b),
For wall-mounted installation, remove the rubber cap attached to the damage prevention collar provided on the rear panel of the housing, and fix it to the other arm bracket with a bolt device etc. Body structure.
In addition, when using a wall hanging type as a self-supporting type, it can be used as a self-supporting type without removing the rubber cap.

  According to the branch junction box and its casing structure according to the present invention, the self-standing type and wall-mounted type casing structure can be shared for both systems, so that the trend of system design based on customer site surveys E-branch junction box cases can be manufactured and stocked without being affected, so an immediate delivery system can be established, providing an economical structure, as well as an on-site installation workability and safety. can do.

Embodiments of a branch junction box according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a schematic perspective view showing an embodiment of a self-standing / wall-mounted shared frame structure (frame solid body) of a branch junction box according to the present invention. All of the frames in the figure are made of a section steel (an angle steel and / or an L-shaped steel), and a rectangular frame for reinforcement is provided at a substantially intermediate position between the longitudinal frame “12,12 ₁ , 12 ₂ , 12 ₃ ” and the longitudinal frame. The horizontal frames “18, 18 ₁ , 18 ₂ , 18 ₃ ” that form the body are welded, and the upper frames “25, 25 ₁ , 15 ₂ , 25 ₃ , which are quadrangular frames having the same shape as the horizontal frame 12, are welded. Is welded to the top of the vertical frame. In addition, a bottom frame “14, 14 ₁ ” whose front is opened in a U shape is welded to the bottom of the vertical frame.

FIG. 2 is a perspective view showing an embodiment of a shared housing structure of a self-standing type and a wall-mounted type of a junction box according to the present invention. 100 branch joint box in FIG, 1 is the housing body, 2 is a front door, 3-3 side cover 4 is canopy over the upper frame of FIG. 1, 25 ₁ and 25 ₃ of the upper frame The lifting brackets 5 and 5 are attached to fix the canopy 4. 5 is a hanging bracket, 6 is a gantry front cover, 7 is a handle (grip) bracket attached to the side cover 3 and the gantry front cover 6, and 8 is for fixing the side cover and the gantry front cover to the casing vertical frame 12. A bolt and nut device, 9 is a lock key knob of the front door 2, 10 is a high-pressure caution display panel, and 11 is a nameplate.

FIG. 3 is a perspective view showing one embodiment of the usage state of the case when the cable is connected, in which the case 1 of the branch connection box 100 is installed on the site as a self-supporting type. That is, the casing 1 is placed on a pedestal 13 installed in advance at the cable connection site, and the bottom frames 14 and 141 of the casing ₁ and the fixing holes 15 and 16 (four places) provided in the pedestal 13 are overlapped, and bolts It is fixed by a nut device, for example, 8 and installed in a self-supporting manner.
In the case 1 of the branch connection box 100 of the present invention, the back cover 20 is not removed from the vertical frame 12 during cable branch connection work, and the side covers 3 and 3 and the gantry front cover 6 are removed from the case vertical frame 12. Connection work is performed. One end of the front door 2 is hinged to the vertical frame 12 so that it can be opened and closed. A terminal connection explanatory diagram 19 is attached to the back side of the front door 2. Reference numeral 17 denotes a branch cable connecting portion. After the connection is completed as shown in the figure, the side and front covers are fixed to the vertical frame 12 with the bolt and nut device 8 to complete the branch connection box 100.

FIG. 4 shows a perspective view of the case 1 of the branch junction box 100 of the present invention as seen from the back side when used as a wall-mounted type. This figure is also a diagram for explaining a method of fixing to the armature 23 fixed to the mounting side wall surface or the concrete pillar. 5 and 6 are enlarged explanatory views as seen from the side of the fixed portion A.
When the back cover 20 is fixed to the armature 23 on the other side, since the edge of the canopy 4 protrudes from the back cover 20 by h, the fixing is hindered. A damage prevention collar 22 corresponding to the height h is welded to the back cover 20. The damage prevention collar 22 is fitted with a rubber cap 21 in order to avoid being damaged by hitting a counterpart metal fitting during transportation.

The procedure for fixing the casing 1 of the branch connection box 100 to the armor 23 is as follows.
The fixed state is shown in FIG. 6, but first, as shown in FIG.
1) Remove the rubber cap 21 from the damage prevention collar 22.
2) Insert the bolt of the bolt and nut device 24 from the side of the arm bracket 23 and tighten the nut.
3) Tighten the other three locations with the above procedure to complete the fixing operation.

The procedure for installing the casing 1 of the branch connection box 100 at the outdoor site will be described below with reference to FIG.
1) A pedestal 13 is installed in advance at a cable branch connection point set up from a buried trough on the side of the railway track about every 400 m.
2) The case 1 is lifted through a wire or the like on a hanging metal fitting provided on the canopy 4 of the case 1 and placed on the mount 13.
3) Remove the side covers 3 and 3 and the front cover 2 and fix the housing 1 to the mount 13. When removing the covers, the bolt and nut device 8 can be loosened and removed, and can be safely removed by holding the handle (grip) bracket 7 and the like.
4) Since one end of the front upper cover 2 is hinged to the vertical frame, it is opened as long as it does not interfere with the cable branch connection work, and the cable branch connection work is performed within the housing.
5) After this branch connection work is completed, the side covers 3, 3 and the front cover 2 are attached to the housing frame again, and the field installation work is completed.

There are two types of conventional junction boxes: free standing and wall hanging types. Which one to use is decided by field survey and a short delivery time is required. It was difficult. For this reason, not only is the cost high, but the mounting bracket protrudes outward on the side of the housing, and there is a risk of injury due to scratching or hooking, which is a problem in terms of safety in installation work.
The branch connection box according to the present invention can solve the above-mentioned problems.
In addition, the branch junction box according to the present invention enables inventory production by making the stand-alone type and the wall-mounted type common, and establishes an immediate delivery system for any installation method and realizes a significant cost reduction. It is now possible to provide a case structure for a branched junction box.

  In the junction box according to the present invention, more specifically, in the case of the self-supporting type, a bottom frame provided with bolt holes for mounting a stand is provided on the bottom of both sides of the housing frame so as to face the inside of the housing. It is advisable to fix it with a bolt device. In addition, in the wall-hanging type, the damage prevention collar provided on the back panel of the housing is used to fix it to the other armor using a bolt device, etc. A highly safe shared junction box and its housing structure can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing an embodiment of a self-standing / wall-mounted shared housing frame structure in a branch connection box for high-voltage cables according to the present invention. The perspective view which shows one Embodiment of the self-standing type | mold and wall-mounted type | mold housing structure in the branch connection box for high voltage | pressure cables by this invention. The perspective view which shows one Embodiment of the use condition of the housing | casing at the time of a cable connection by installing the housing | casing of the branch connection box for high voltage cables by this invention as a self-supporting type | mold. The perspective view seen from the back side at the time of using the housing | casing of the branch connection box for high voltage | pressure cables by this invention as a wall hanging type. Explanatory drawing enlarged from the side of the fixed part A. Explanatory drawing which shows the condition which fixed the housing | casing to the bracelet. It is a photograph which shows the structure of a self-standing type and a wall hanging type in the conventional junction box for high voltage cables.

Explanation of symbols

1 housing (housing body)
DESCRIPTION OF SYMBOLS 2 Front door 3, 3 Side cover 4 Canopy 5 Lifting bracket 6 Base front cover 7 Handle (grip) bracket 8 Bolt nut device 9 Lock key knob 10 High pressure caution display panel 11 Name plate 12-12 ₃ Vertical frame 13 Base 14, 14 ₁ Bottom frame 15 Fixing hole 16 Fixing hole 17 Branch cable connecting part 18-18 ₃ Horizontal frame 19 Terminal connection explanatory drawing 20 Back cover 21 Rubber cap 22 Damage prevention collar 23 Arm hardware 24 Bolt nut device 25-25 ₃ Upper frame 26 Through hole h Canopy edge protrusion height

Claims (1)

A branch connection box comprising a case, a branch connection means for a cable disposed inside the case, and a case attachment means for attaching the case to an external object,
The housing is
A frame solid formed by combining four vertical frames and a square frame-shaped horizontal frame into a cubic shape;
A lid attached to the upper part thereof;
With a bottom frame attached to its lower part,
A front cover that can be detachably or removably attached to the front surface;
A back cover attached to the back side,
Two side covers that are detachably or removably attached to the left and right sides;
With
The housing mounting means is
In order to install the housing in a self-supporting state, self-supporting attachment means provided on the bottom frame;
In order to install the housing in a wall-hanging state, it is configured to include two means: a wall-hanging attachment means provided on the back cover ,
The bottom frame of the casing is provided so as to be positioned below the two side covers of the casing, and has a bolt hole and a fixing member for self-standing installation with an external object, By the fixing member, the bottom frame at the lower part of the casing is fixed and fixed to the external object, so that the casing is self-supporting.
The back panel of the housing includes a mounting hole for wall-mounted installation with an external object and a fixing member, and the back panel on the back of the housing is fixed to the external object by the fixing member. The wall mounting type of the housing is made,
The fixing member has a length in which the lid projects from the back panel of the casing, and a protective cap that is fitted to the fixing member, and a hexagon bolt and nut provided in the mounting hole. branch connection box, characterized in that it comprises and.

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