JP4587899B2 - Underground type low pressure branching device and underground box - Google Patents

Description

  The present invention relates to an underground buried type low-pressure branching apparatus for connecting a main line and a branch lead-in line of a low-voltage underground distribution line, and an underground box in which it is arranged.

  Specifically, the present invention comprises a box-shaped main body portion and a box-shaped lid portion that also serves as a waterproof dome. The main body portion accommodates a bus bar for connecting a trunk line and a branch lead-in wire, and the main body portion. A through-hole for passing the trunk line and branch lead-in line is provided on the bottom surface of the main body, and a waterproof cushioning member is provided on the lid portion that comes into contact with the opening end of the main body. It is related to the underground buried type low-pressure branching device etc. that can be manufactured easily and can be easily connected and replaced.

  Distribution lines have been underground as part of city planning. In Patent Document 1, a low-voltage underground distribution line is branched and drawn into each low-voltage load facility, and a branch of a low-voltage trunk line and a connection of a lead-in line are connected at a ground portion corresponding to a hand hole portion as an underground burial box. A low pressure branching device has been proposed.

  In this low-pressure branching device, a branch connection member constituted by a plurality of copper bus bars and branch terminals, and a breaker or a fuse as a protection device are incorporated in a low-pressure branch box having an open / close door. After this low-pressure branch box is fixed to the concrete foundation of the handhole with a bolt via a base member, the low-voltage trunk line and the lead-in line that are set up from the underground distribution line are connected.

  Since this low-pressure branching device is mainly installed on a sidewalk, there is a problem in safety or environmental maintenance. Thus, for example, Patent Document 2 proposes an underground buried type low-pressure branching device that is used in a hand hole. In this underground buried type low-voltage branching device, the main line and branch lead-in line of the low-voltage underground distribution line are mounted and supported on the mounting bracket in parallel for the four phases of the U phase, V phase, W phase, and O phase. Covered with a box-shaped waterproof dome, it forms a pool of air at the connection part during flooding to prevent inundation.

JP 2001-238343 A JP 2000-295754 A

  The underground buried type low-pressure branching device described in Patent Document 2 described above has a structure in which a waterproof dome is put on the connecting portion of the trunk line and the branch lead-in line, and the branch terminal connection is coupled with the waterproof effect of the waterproof dome. In order to improve the waterproof reliability of the connection part, a connection cover that protects the branch terminal, a watertight band that prevents water from entering the connection part, a waterproof cap that protects the connection part from water immersion, etc. are required. There is a problem that it is complicated and expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an underground buried type low-pressure branching device and the like that can be manufactured at low cost with a simple structure and that can be easily connected and replaced.

The concept of this invention is
An underground buried type low-pressure branching device that stores a main line and a branch lead-in line of a low-voltage underground distribution line in a underground box,
A box-shaped main body section that is partitioned into U-phase, V-phase, W-phase, and O-phase housing sections, and a lid section that also functions as a box-shaped waterproof dome that covers and closes the opening of the main body section from above. And consist of
Bus bars corresponding to the respective phases for connecting the trunk line and the branch lead-in line are accommodated in the accommodating portions of the respective phases ,
On the bottom surface of the main body, a through portion for passing the trunk line and the branch lead-in line is provided,
The underground buried type low-pressure branching device is characterized in that a waterproof cushioning member is provided at a portion where the lid and the opening end of the main body contact each other.

Another concept of the present invention is
An underground box in which the low-pressure branching device is disposed,
A support member for mounting the low-pressure branching device is attached to the upper side surface.

  In this invention, the underground buried type low-pressure branching device includes a box-shaped main body portion and a lid portion that also serves as a box-shaped waterproof dome that covers and closes the opening of the main body portion from above. A waterproof cushioning member such as a rubber packing is provided at a portion of the lid that comes into contact with the opening end of the main body. Therefore, in the state where the opening of the main body is covered with the lid and closed, the main body and the lid are sufficiently overlapped, and the inside is sealed.

  In this underground buried type low-pressure branching device, a bus bar is accommodated in the main body portion, and a through portion for passing a trunk line and a branch lead-in wire is provided on the bottom surface of the main body portion. For this reason, the main line and the branch lead-in line of the low-voltage underground distribution line are connected inside the underground buried low-voltage branching device.

  In this underground type low-pressure branching device, the main line and branch lead-in line are connected in a sealed interior, and it is not necessary to protect the connection part from flooding. Can be manufactured. Further, by removing the lid from the main body, it is possible to easily perform the main line and branch lead-in line connection work, the fuse replacement work, and the like.

  For example, a tapered trapezoidal cylindrical protruding portion that protrudes to the outside and is formed integrally with the bottom surface, corresponding to each through portion provided on the bottom surface of the main body portion. In this case, the cylindrical part is opened and cut at the diameter corresponding to the diameter of the cable that passes through each penetration, and waterproofing with waterproofing tape can be prevented well, and the freedom of cable selection Can be increased.

  For example, the inside of the main body is partitioned into U-phase, V-phase, W-phase, and O-phase housing portions, and bus bars corresponding to the respective phases are housed in the housing portions of the respective phases. Thereby, insulation of each phase can be performed favorably.

  This underground buried type low-pressure branching device is used by being placed in an underground box, for example, a hand hole. A support member for supporting the underground buried type low-pressure branching device is attached to the upper part of the side surface of the underground box. The above-mentioned underground buried type low-pressure branching device is arranged on the upper part of the underground box by being supported by this support member. Therefore, the underground buried type low-pressure branching device can be taken out from the underground box, and the work for connecting the main line and the branch service line and the work for replacing the fuse can be performed, thereby improving workability.

According to this invention, the box-shaped main body portion and the box-shaped lid portion that also serves as a waterproof dome are formed, and the bus bar for connecting the main line and the branch lead-in wire is accommodated in the main body portion. A through-hole for passing the trunk line and branch lead-in line is provided on the bottom, and a cushioning member for waterproofing is provided on the lid part in contact with the opening end of the main body. In addition, connection work, fuse replacement work, etc. can be easily performed. Furthermore, each phase can be well insulated inside the main body, and each phase can be connected in an orderly manner, so that maintenance and inspection are easy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a configuration of an underground buried type low-pressure branching apparatus 100 as an embodiment. FIG. 1 is a cross-sectional view of the main part viewed from the front side of the underground buried type low-pressure branching device 100. FIG. 2 is a side view of the underground buried type low-pressure branching device 100. This underground buried type low-pressure branching device 100 is a undergrounding type low-pressure branching device for two drawing-in, that is, a underground buried type low-pressure branching device capable of simultaneous drawing-in with respect to two lamps and a low-pressure load of power.

  This underground buried type low-pressure branching device 100 includes a rectangular box-shaped base member 102 as a main body and a rectangular box-shaped waterproof dome as a lid that covers and closes the opening of the base member 102 from above. The upper lid 103 is also used as the same. In this case, in a state where the upper lid 103 is put on the base member 102, the base member 102 and the upper lid 103 are sufficiently overlapped. The base member 102 and the upper lid 103 are formed by molding an insulating material such as synthetic resin.

  Details of the base member 102 will be described. 3 is a perspective view of the base member 102, FIG. 4 is a top view of the base member 102, FIG. 5 is a front view of the base member 102, and FIG. 6 is a side view of the base member 102.

  The base member 102 accommodates, for example, a copper plate-like bus bar 104 for connecting the trunk line and branch lead-in line of the low-voltage underground distribution line. The inside of the base member 102 is partitioned by a partition 105 in a direction orthogonal to the longitudinal direction, and four accommodating portions 106u, 106v, 106w, and 106o of U phase, V phase, W phase, and O phase are formed. . The bus bars 104 corresponding to the U phase, the V phase, the W phase, and the O phase are accommodated in the accommodating portions 106u, 106v, 106w, and 106o, respectively.

  The accommodating portions 106u, 106v, 106w, and 106o are each partitioned by a partition 107 in the longitudinal direction to form three small accommodating portions 106a, 106b, and 106c. A notch 108 for fitting the side end of the bus bar 104 is formed in the partition 107, and the bus bar 104 accommodated in each of the accommodating portions 106u, 106v, 106w, 106o has three small accommodating portions 106a, 106b and 106c are accommodated.

  Around the bottom surface of the base member 102, a flange 109 is formed integrally with the bottom surface. When the upper cover 103 is put on the base member 102, the opening end of the upper cover 103 is brought into contact with the flange 109. At both ends in the longitudinal direction of the flange portion 109, convex portions 110 are formed for locking hooks, which will be described later, of the upper lid 103 placed on the base member 102.

  On the bottom surface of the base member 102, as shown in FIG. 4, through portions 111a to 111f for passing the trunk line and the branch lead-in line are provided. Here, the trunk line is wired in a three-phase four-wire system, corresponding to the small accommodating portions 106b of the four accommodating portions 106u, 106v, 106w, 106o of the U phase, V phase, W phase, and O phase, respectively. Two penetration parts 111a and 111b are provided. In this case, the penetrating part 111a is used for passing a power supply side trunk cable, and the penetrating part 111b is used for passing a load side trunk line cable.

  In addition, two penetrating portions 111c and 111d are provided corresponding to the small accommodating portions 106a of the U phase and V phase accommodating portions 106u and 106v, respectively, and the small sizes of the U phase and V phase accommodating portions 106u and 106v are provided. Two penetrating portions 111e and 111f are provided corresponding to the accommodating portions 106c, respectively. Also, one through portion 111c is provided corresponding to the small accommodating portion 106a of the W phase accommodating portion 106w, and one through portion 111f is provided corresponding to the small accommodating portion 106c of the W phase accommodating portion 106w. ing. Further, one through portion 111d is provided corresponding to the small accommodating portion 106a of the O phase accommodating portion 106o, and one through portion 111e is provided corresponding to the small accommodating portion 106c of the O phase accommodating portion 106o. ing.

  The three through portions 111c, 111c, 111c provided in the small accommodating portions 106a of the three accommodating portions 106u, 106v, 106w of the U phase, the V phase, and the W phase are branched for a power load (three-phase load). The three through portions 111d, 111d, and 111d that are used to pass the lead-in cable and are provided in the small accommodating portions 106a of the three accommodating portions 106u, 106v, and 106o of the U phase, the V phase, and the O phase Used to route branch lead-in cable for (single-phase load).

  Further, the three through portions 111f, 111f, and 111f provided in the small accommodating portions 106c of the three accommodating portions 106u, 106v, and 106w for the U phase, the V phase, and the W phase are for power loads (three-phase loads). The three through portions 111e, 111e, 111e provided in the small accommodating portions 106c of the three accommodating portions 106u, 106v, 106o for the U-phase, V-phase, and O-phase Used to pass branch lead-in cable for electric light load (single phase load).

  On the bottom surface of the base member 102, a tapered trapezoidal cylindrical projecting portion 112 projecting to the outside is formed integrally with the bottom surface, corresponding to each of the through portions 111a to 111f. In this embodiment, the trapezoidal cylindrical protrusion 112 is tapered stepwise. In the state before use, the tip of the trapezoidal cylindrical protrusion 112 is closed, and when passing the cable, the trapezoidal cylindrical protrusion 112 is opened and cut at a diameter corresponding to the diameter of the cable. Waterproofing with waterproof tape. Thereby, it is possible to satisfactorily prevent water from penetrating portions 111a to 111f from entering the inside, and cables having various diameters can be used, and the degree of freedom in selecting the cables can be increased.

  Next, the upper lid 103 will be described. 7 is a perspective view of the upper lid 103, FIG. 8 is a top view of the upper lid 103, FIG. 9 is a front view of the upper lid 103, and FIG. 10 is a side view of the upper lid 103.

  Locking hooks 115 are formed on both ends in the longitudinal direction of the upper lid 103 on the end side of the opening. When the upper lid 103 is put on the base member 102 described above, the locking hook 115 is deformed by utilizing its elasticity, and is locked to the convex portion 110 of the base member 102. Accordingly, the base member 102 is fixed in a state where the upper lid 103 is covered. The upper lid 103 can be removed from the base member 102 by elastically deforming the locking hook 115 of the upper lid 103 to release the locking state with the convex portion 110 of the base member 103.

  As shown in FIG. 1, a waterproof cushioning member, for example, rubber packing 116, is provided at a portion of the upper lid 103 that contacts the opening end of the base member 102. As a result, when the upper lid 103 is placed on the base member 102 described above, the end of the opening of the base member 102 is in contact with the rubber packing 116, so that it is possible to satisfactorily prevent water from entering the inside.

  11 is a perspective view showing a state in which the upper lid 103 is placed on the base member 102, FIG. 12 is a front view showing a state in which the upper lid 103 is placed on the base member 102, and FIG. 13 shows a state in which the upper lid 103 is placed on the base member 102. FIG.

  When the above-described underground buried type low-pressure branching device 100 is used, first, the main line cable and the branch lead-in cable are connected with the upper cover 103 removed from the base member 102. FIG. 14 shows an example of wiring.

  The power-side trunk cable 113P and the load-side trunk cable 113L are connected to the bus bars 104 respectively accommodated in the four accommodating portions 106u, 106v, 106w, 106o of the U phase, V phase, W phase, and O phase. Is done. The power supply side main cable 113P is introduced into the base member 102 through the through-hole 111a, and the load-side main cable 113L is introduced into the base member 102 through the through-hole 111b. In this case, the trapezoidal cylindrical protruding portion 112 formed corresponding to the through portions 111a and 111b is opened and cut at a diameter portion corresponding to the diameter of the trunk cables 113P and 113L, and waterproofed with a waterproof tape. .

  In addition, a branch lead-in cable 114A for a light load is connected to the bus bars 104 housed in the three housing portions 106u, 106v, and 106o for the U phase, the V phase, and the O phase, respectively. A branch lead-in cable 114 </ b> A is connected to each of the bus bars 104 housed in the housing parts 106 u and 106 v via the fuse 117. The branch lead-in cable 114A is introduced into the base member 102 through the through-hole 111d. In this case, the trapezoidal cylindrical protrusion 112 formed corresponding to the through-hole 111d is opened and cut at a diameter portion corresponding to the diameter of the branch lead-in cable 114A and waterproofed with a waterproof tape.

  A branch lead-in cable 114B for power load is connected to the bus bars 104 housed in the three housing portions 106u, 106v, and 106w of the U phase, V phase, and W phase, respectively. A branch lead-in cable 114 </ b> B is connected to each bus bar 104 via a fuse 118. The branch lead-in cable 114B is introduced into the base member 102 through the through portion 111f. In this case, the trapezoidal cylindrical protrusion 112 formed corresponding to the through-hole 111f is cut open at a diameter corresponding to the diameter of the branch lead-in cable 114B, and waterproofed with a waterproof tape.

  1 shows a state cut along the line aa ′ in FIG. 14. FIG. 1 shows a bus bar 104 accommodated in the accommodating portion 106u for simplification of the drawing. Only the connection state for is shown.

  As described above, after the main cables 113P and 113L and the branch lead-in cables 114A and 114B are connected to the bus bars 104 accommodated in the base member 102, the upper cover 103 is put on the base member 102. In this case, the locking hook 115 of the upper lid 103 is locked to the convex portion 110 of the base member 102, and the upper lid 103 is fixed to the base member 102 while being covered with the base member 102.

As shown in FIG. 1, the above-described underground low-pressure branching device 100 is disposed and used in a handhole body 201 embedded in the underground 120 .

  A support fitting 202 as a support member for supporting the underground buried type low-pressure branching device 100 is attached to the handhole main body 201 at the upper part of the side surface 201S. The underground buried type low-pressure branching device 100 is detachably supported on the support fitting 202. A lid frame 203 is fixed to the upper opening end of the handhole main body 201, and the handhole upper lid 204 is placed on the lid frame 203.

  As described above, when connecting a main line cable and a branch service cable, or when replacing a fuse, for example, as shown in FIG. The work can be carried out by taking out from the upper part and placing this underground buried type low-pressure branching device 100 on a work table 210. Thereby, sufficient work space can be secured and construction such as cable connection can be easily performed. In this case, each cable needs to have a surplus length that allows the underground buried type low-pressure branching device 100 to be taken out from the handhole body 201.

  FIG. 16 shows a system diagram of an underground low-voltage distribution line using the underground buried low-voltage branching device 100 described above. The low-voltage electricity transformed by the transformer 221 is supplied from the main line 222 of the low-voltage underground distribution line to each low-voltage load facility through the underground buried low-voltage branching device 100 arranged in the handhole main body 201.

  According to the underground buried type low-pressure branching device 100 described above, when the upper lid 103 is put on the base member 102, the base member 102 and the upper lid are sufficiently overlapped, and the opening end of the base member 102 is on the upper lid 103. The rubber seal 116 is in contact with the provided rubber packing 116 to prevent water from entering inside. Further, since the upper lid 103 has a box shape, the upper lid 103 also has a function of a waterproof dome, and an air pool is formed at the time of submergence to prevent water from entering the inside. Therefore, the main line and the branch lead-in line are connected in a sealed interior, and the structure for protecting the connection portion from water infiltration is not necessary, and the conventional fuse for the low-voltage branch device can be used, and the structure is simple. And can be manufactured at low cost.

  Further, according to the underground buried type low-pressure branching device 100, by removing the upper lid 103 from the base member 102, the inside of the base member 102, that is, the cable connection portion can be easily exposed. Therefore, it is possible to easily perform the connection work of the main line cable and the branch lead-in cable, the replacement work of the fuse, and the confirmation of the connection.

  Further, according to the underground buried type low-pressure branching apparatus 100, the interior of the base member 102 is divided into four accommodating portions 106u, 106v, 106w, and 106o of U phase, V phase, W phase, and O phase by the partition 105. It is partitioned and accommodates a bus bar 104 corresponding to each of the U phase, V phase, W phase, and O phase, and each phase can be well insulated inside the base member 102. Each phase can be connected in an orderly manner, making maintenance and inspection easy.

  Further, according to the underground buried type low-pressure branching device 100, the base member 102 has a bottom surface of the trapezoidal cylindrical projecting portion 112 that protrudes to the outside and corresponds to each of the through portions 111a to 111f. In the state before use, the tip of the trapezoidal cylindrical protrusion 112 is closed, and when passing the cable, the trapezoidal cylindrical protrusion protrudes at the diameter corresponding to the diameter of the cable. The portion 112 is cut open and waterproofed with a waterproof tape to prevent water from entering inside. Therefore, various cables having different thicknesses can be used, and the degree of freedom in cable selection can be increased.

  Further, a support fitting 202 is attached to the upper part of the side surface 201S of the handhole main end 201. When the underground buried type low-pressure branching device 100 is disposed in the handhole main body 201, the handhole main body 201 is supported by the support fitting 202. Supported at the top of the. Therefore, this underground buried type low-pressure branching device 100 can be taken out from the handhole main body 201 to the ground, and the work for connecting the main line and the branch service line, the work for replacing the fuse, and the like can be performed, and the workability can be improved.

  Moreover, since the underground buried type low-pressure branching device 100 is supported on the upper part of the handhole main body 201, it also serves as the fall prevention fence, so that the safety of work is also improved.

  In the above-described embodiment, the two-ground underground low-pressure branching device 100 that can be pulled in simultaneously for two lamps and a low-voltage load of power is shown. The load can be one lead-in with a CVQ (4-core) cable or the like. The present invention can be similarly applied to an underground buried type low-pressure branching apparatus capable of further drawing.

  Further, in the above-described embodiment, an example of a hand hole is given as an underground burial box. However, the present invention arranges an underground buried type low-pressure branching device in another underground burial box, for example, a manhole. The same applies to things.

  The present invention is simple in construction and can be manufactured at low cost, and can be easily performed in connection work, fuse replacement work, and the like. Etc.

It is the figure which made the principal part seen from the front side of the underground buried type low voltage | pressure branch apparatus as embodiment which made the cross section. It is the figure seen from the side of the underground buried type low-pressure branching apparatus as an embodiment. It is a perspective view of a base member. It is a top view of a base member. It is a front view of a base member. It is a side view of a base member. It is a perspective view of an upper lid. It is a top view of an upper lid. It is a front view of an upper lid. It is a side view of an upper lid. It is a perspective view which shows the state which covered the upper cover on the base member. It is a front view which shows the state which covered the upper cover on the base member. It is a side view which shows the state which covered the upper cover on the base member. It is a figure which shows the example of wiring of a trunk line cable and a branch lead-in cable. It is a figure which shows work examples, such as connection construction of a trunk line cable and a branch service line cable. It is a systematic diagram of an underground low voltage distribution line using an underground buried type low voltage branching device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Underground type low-pressure branching device, 102 ... Base member, 103 ... Top cover, 104 ... Bus bar, 105, 107 ... Partition, 106u, 106v, 106w, 106o ... 106a, 106b, 106c ... small accommodating part, 108 ... notch, 109 ... collar part, 110 ... convex part, 111a-111f ... penetrating part, 112 ... trapezoid cylindrical shape Projection part, 113P ... trunk cable on the power source side, 113L ... trunk cable on the load side, 114A ... branch lead-in cable for light load, 114B ... branch lead-in cable for power load, 115 ...・ Hook for locking, 116: rubber packing, 117, 118 ... fuse, 120 ... underground, 201 ... handhole body, 201S ... side surface, 202 ... support Holding bracket, 203 ... lid frame, 204 ... upper lid of hand hole, 210 ... work table, 221 ... transformer, 222 ... trunk line

Claims (3)

An underground buried type low-pressure branching device that stores a main line and a branch lead-in line of a low-voltage underground distribution line in a underground box,
A box-shaped main body section that is partitioned into U-phase, V-phase, W-phase, and O-phase housing sections, and a lid section that also functions as a box-shaped waterproof dome that covers and closes the opening of the main body section from above. And consist of
Bus bars corresponding to the respective phases for connecting the trunk line and the branch lead-in line are accommodated in the accommodating portions of the respective phases ,
On the bottom surface of the main body, a through portion for passing the trunk line and the branch lead-in line is provided,
A waterproof cushioning member is provided at a portion where the lid and the opening end of the main body abut against each other. The tapered trapezoidal cylindrical projecting portion protruding outward and corresponding to each penetrating portion provided on the bottom surface of the main body is integrally formed with the bottom surface. The underground buried type low-pressure branching device described. A buried box in which the underground buried type low-pressure branching device according to claim 1 is disposed,
A underground burial box, characterized in that a support member for supporting the underground buried type low-pressure branching device is attached to the upper part of the side surface.

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