JP2015116028A - Ground installation type electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground installation type electric apparatus that can be installed at various kinds of installation sites without changing its outer case specification.SOLUTION: A foundation base 3 is fixed to a concrete pit 1 by screwing bolts b11-b14, which penetrates through four mounting holes arranged in the foundation base 3, with anchor nuts fixed to the concrete pit 1, in a state where the mounting holes are positioned at four corners of a square, and a component of an electric apparatus is supported with respect to the foundation base 3 through an installation base. An outer case body 400 having an opening which can be closed by a door 410 on a side face 4a and having windows on the other side faces 4b-4c is arranged on the foundation base 3, and the component of the electric apparatus is housed in the outer case body 400 together with the installation base. Cover plates 9A-9C are detachably attached on the windows arranged in the side faces 4b-4c of the outer case body, and a pressure release part 900 is arranged on the cover plate 9B to release a pressure inside the outer case.

Description

  The present invention relates to a ground-mounted electrical device such as a ground-mounted multi-circuit switch or a ground-mounted transformer.

  In a distribution system in which a distribution line is laid in the ground, as shown in Patent Document 1 and Patent Document 2, a ground-mounted multi-circuit switch having a structure in which components are housed in a rectangular parallelepiped outer box And ground-mounted electrical devices such as ground-mounted transformers are installed on concrete pits built on the sidewalks in urban areas. The outer box of this type of electrical equipment has a door on the front surface that is opened during maintenance and inspection work, and a pressure relief port on the other surface for releasing the internal pressure generated when an internal short circuit accident occurs. When installing ground-mounted electrical equipment on the sidewalk, to ensure the safety of maintenance and inspection work, install the outer box with the door that is opened during the work facing the sidewalk where the car does not pass There is a need to. Moreover, in order to prevent the hot air blown out from the pressure release port when the internal short circuit accident occurs from touching the pedestrian, the pressure release port needs to be provided on the surface of the outer box facing the roadway side.

JP-A-9-28006 JP 2002-171614 A

  Conventionally, since ground-mounted electrical equipment has been mainly installed on the sidewalk, it has been determined that the work can be safely performed on the side of the side where the car cannot pass, and the desired pressure release direction has been determined on the side of the road. However, recently, as distribution lines have become underground, it has become more common to install ground-mounted electrical devices in parks or in parking lots. When installing ground-mounted electrical equipment in a place other than a sidewalk, the location where the work can be performed safely and the desired pressure release direction are not uniform. Need to change. However, in conventional ground-mounted electrical equipment, when changing the position of the outer box door and the position of the pressure relief port, it is necessary to change the specifications of the outer box, so that the cost of the equipment can be avoided. There wasn't.

  The object of the present invention is to easily change the direction of the door and the direction of the discharge port according to the installation environment without changing the specifications of the outer box, and can be easily installed in places other than the sidewalk. An object of the present invention is to provide a ground-mounted electrical device that can be used.

  The present invention relates to a foundation base arranged on a concrete pit having a rectangular opening and fixed around the opening of the concrete pit by a bolt, and an outer box formed in a rectangular parallelepiped shape and arranged on the foundation base And a ground-mounted electrical device that is disposed in the outer box and is supported by the foundation base.

  In the present invention, the outer box has an opening on one side surface and a window on each of the other three side surfaces, and is arranged on the base base in a state in which the components of the electrical equipment are accommodated inside. The outer box main body, a door for closing the opening of the outer box main body so as to be openable and closable, and three lid plates for closing three windows respectively provided on the three side surfaces of the outer box main body, One of the three lid plates is provided with a pressure release portion that releases the pressure in the outer box. Each cover plate of the outer box is configured so that it can be detachably attached to any of the three side surfaces provided with windows of the outer box body. The foundation base is attached to the concrete pit. Four mounting holes for penetrating the bolts to be fixed are provided with their centers positioned at the four apexes of the square.

  If comprised as mentioned above, when installing a ground installation type electric equipment, the installation position of the outer box was set so that it might be arranged along the longitudinal direction of the opening part of a concrete pit (n is an integer greater than or equal to 2). ) Can be selected appropriately from the installation positions, and at each installation position, the door of the outer box is along one direction along the longitudinal direction of the concrete pit and the other direction and along the width direction of the concrete pit. Since it can be arranged in any one of the four directions of the one direction and the other direction, the installation mode of the outer box can be changed to 4 × n ways.

  Therefore, if comprised as mentioned above, the ground installation type electric equipment installed in a various different installation place can be comprised using the outer box of the same specification, and it aims at the reduction of cost by aiming at the standardization of an outer box. be able to.

  Moreover, since the pressure relief part of an outer box can be provided in any surface of three side surfaces other than the surface in which the door was provided if comprised as mentioned above, of course, when installing an outer box on a sidewalk Even when installing on a place other than the sidewalk, the outer box door and the pressure relief part are oriented in a direction that does not cause safety problems, depending on the situation of the installation location, without changing the specifications of the outer box. Can be placed in a state.

  In addition, with the above configuration, when installing the necessary electrical equipment in the outer box, and when performing maintenance inspections and repairs after installation on the site, work with the three windows of the outer box body open. Therefore, workability can be improved.

  In one aspect of the present invention, the base base is provided so as to extend in parallel with each other, and is arranged along two opposite sides of the lower end of the outer box main body, respectively, and One side that is provided so as to connect between one end in the longitudinal direction of the first band plate portion and one end in the longitudinal direction of the second band plate portion, and is perpendicular to the two lower ends of the outer box body And a third band plate portion arranged along the upper and lower sides of the first band plate portion in the longitudinal direction and the second band plate portion when viewed from above. The attachment holes are respectively formed at both ends in the longitudinal direction of the band plate portion.

  The bolt that penetrates the mounting hole of the foundation base may be a bolt that is screwed into an anchor nut provided in the concrete pit, or an anchor bolt that is fixed to the concrete pit.

  The said pressure release part can be comprised by the pressure release plate which gave air permeability with many holes or louvers. In this case, the pressure relief plate constituting the pressure relief portion is attached so as to close the window portion provided in one of the three lid plates.

  According to the present invention, since the ground-mounted electrical equipment to be installed at various different installation locations can be configured using the outer box of the same specification, it is possible to reduce the cost by standardizing the outer box. it can.

  Also, according to the present invention, when installing necessary electrical equipment in the outer box, and during maintenance inspection after installation on the site, the work is performed with the three windows of the outer box body opened. Therefore, assembly work and maintenance, inspection, and repair work of electrical equipment can be facilitated.

It is the front view which showed the state which installed the ground installation type electric equipment which concerns on one Embodiment of this invention in the concrete pit. FIG. 2 is a left side view of the ground-mounted electric device shown in FIG. 1. FIG. 2 is a rear view of the ground-mounted electric device shown in FIG. 1. FIG. 2 is a right side view of the ground-mounted electric device shown in FIG. 1. FIG. 3 is a top view of the ground-mounted electric device shown in FIG. 2. It is the front view which showed the state which cut the concrete pit in the ground installation type electric equipment shown in FIG. 1, and removed the door of the outer box. It is the perspective view which showed an example of the door pressing member which comprises the edge part of the lower end of the opening part of the one side of an outer case main body in one Embodiment of this invention. It is the top view which showed an example of the concrete pit which installs the ground installation type electric equipment shown in FIGS. It is a top view of the foundation base used in this embodiment. 7 is a top view showing a state in which a foundation base and a pit lid are arranged on the concrete pit shown in FIG. 8 in the embodiment shown in FIGS. When the ground-mounted electric device according to the embodiment of the present invention is installed in a direction different by 90 degrees with respect to the direction shown in FIGS. 1 to 7, the foundation base and the concrete base pit shown in FIG. It is the top view which showed the state which has arrange | positioned the pit cover. (A) thru | or (D) model four different installation modes in the case of installing the ground installation type electric equipment which concerns on this invention in the state which orient | assigned the outer box door to the longitudinal direction of the opening part of a concrete pit. FIG. (A) thru | or (D) model four different installation aspects in the case of installing the ground installation type electric equipment which concerns on this invention in the state which orient | assigned the outer box door to the width direction of the opening part of a concrete pit. FIG.

Embodiments of a ground-mounted electrical device according to the present invention will be described below with reference to the drawings.
The ground-mounted electrical device according to the present invention connects a transformer, a switch, or the like to a distribution system in which distribution lines are laid in the ground, such as a ground-mounted transformer or a ground-mounted multi-circuit switch. It is installed on the ground for this purpose. The ground-installed electric device is composed of an outer box and components of the electric device housed in the outer box, and the outer box is installed on a concrete pit constructed at an installation location.

  1 to 6 show the overall configuration of an embodiment of a ground-mounted electrical device according to the present invention. In these drawings, 1 is a concrete pit and 2 is a ground-mounted electrical device. . The concrete pit 1 in which the ground-mounted electric device according to the present embodiment is installed has a frame shape in which a portion arranged in a state of protruding upward from the ground E has a rectangular opening 101 as shown in FIG. It is comprised so that the shape of this may be exhibited. The lower end of the concrete pit 1 is connected to an underground ditch (not shown) in which a distribution cable is arranged, and a cable (not shown) raised from the underground ditch is connected to a hole 102 inside the concrete pit 1. Through the inside (see FIGS. 6 and 8), it is introduced into the outer box of the ground-mounted electrical device fixed on the concrete pit 1.

  The ground-mounted electrical device 2 includes a foundation base 3 fixed around the opening 101 of the concrete pit 1, an outer box 4 formed in a rectangular parallelepiped shape and disposed on the foundation base 3, and an outer box 4 And a component of an electric device arranged and supported with respect to the base base 3.

  The ground-mounted electrical device 2 according to the present embodiment is a ground-mounted multi-circuit switch that opens and closes a switch that is inserted into a trunk line of a power distribution system or between a trunk line and a plurality of branch lines. A switch unit 5 (see FIG. 6) including a switch group including a plurality of switches and an operation mechanism for operating each switch is housed in a metal outer box 4. The switch unit 5 is accommodated in the outer box 4 with its lower end installed on an installation base 6 fixed to the foundation base 3.

  The rectangular opening 101 of the concrete pit 1 is formed so that a portion that is not blocked by the outer box 4 is left in a state where the ground-mounted electric device 2 is installed on the concrete pit 1. A portion of the opening 101 that is not blocked by the outer box 4 is closed by a pit lid 7 that is detachably attached to the concrete pit 1.

  As shown in FIG. 8, the foundation base 3 is placed around the opening 101 of the concrete pit 1 when the outer case 4 is installed at a first installation position set near one end in the longitudinal direction of the opening 101. When the four first group anchor nuts n11 to n14 used for fixing to the pit 1 and the outer box 4 are installed at the second installation position set near the other end in the longitudinal direction of the opening 101. When the four second group anchor nuts n21 to n24 used for fixing the foundation base 3 to the concrete pit 1 and the outer box 4 of the ground-mounted electric device are installed at the first installation position. The anchor nuts n15 and n16 that are used only for fixing the pit lid 7 that closes the portion that is not blocked by the outer box 4 and the outer box 4 are blocked by the outer box 4 when installed in the second installation position. Close no part Tsu anchor nut n25 using only circuiting lid 7 to secure, n26 and are provided. Each anchor nut is provided with its central axis oriented in a direction perpendicular to the upper surface (horizontal plane) of the concrete pit 1.

  In the present embodiment, when the outer box 4 is installed at each installation position, the front of the outer box can be directed in any one of four directions different by 90 degrees. Anchor nuts are arranged with their respective centers positioned on the four vertices of a square on the horizontal plane (on the top surface of the concrete pit). In the present specification, arranging the four anchor nuts in this way is referred to as arranging the four anchor nuts in a square shape.

  In the example shown in the figure, two anchor nuts n11 and n13 are arranged at a constant pitch P1 in the width direction of the concrete pit at a position near one end in the longitudinal direction of the concrete pit 1, and the two anchor nuts n11 and n12 are put into concrete. Arranged at a constant pitch P1 in the longitudinal direction of the concrete pit 1 at a position near one end in the width direction of the pit 1 and two anchor nuts n13 and n14 at a position near the other end in the width direction of the concrete pit 1 A state in which the concrete pits 1 are arranged at a constant pitch P1 in the longitudinal direction and two anchor nuts n12 and n14 are arranged at a constant pitch P1 in the concrete pit width direction at a position near the center of the concrete pit in the longitudinal direction. The four first group anchor nuts n11 to n14 are squarely arranged.

  In the illustrated example, two anchor nuts n21 and n23 are arranged at a constant pitch P1 in the width direction of the concrete pit at a position near the other end in the longitudinal direction of the concrete pit 1, and two anchor nuts n21 and n22 are arranged. Are arranged at a constant pitch P1 in the longitudinal direction of the concrete pit 1 at a position near one end in the width direction of the concrete pit 1, and two anchor nuts n23 and n24 are arranged near the other end in the width direction of the concrete pit 1. At a fixed pitch P1 in the longitudinal direction of the concrete pit 1, and two anchor nuts n22 and n24 are arranged at a constant pitch P1 in the width direction of the concrete pit at a position near the center of the concrete pit in the longitudinal direction. In this state, four second group anchor nuts n21 to n24 are squarely arranged. The longitudinal dimension L of the opening 101 of the concrete pit 1 satisfies the relationship L <2 × P1, and the width W of the opening 101 is set to satisfy the relationship W <P1.

  The anchor nuts n25 and n26 used for fixing the pit lid 7 when the base base 3 is fixed to the concrete pit using the first group of anchor nuts n11 to n14 are respectively between the anchor nuts n12 and n21 and the anchor. Between the nuts n14 and n23, the anchor nuts n12 and n14 are provided at a constant interval P2. When the foundation base 3 is fixed to the concrete pit using the anchor nuts n11 to n14, the pit cover 7 is fixed to the concrete pit 1 using the anchor nuts n25 and n26 and the anchor nuts n21 and n23.

  Anchor nuts n15 and n16 used to fix the pit cover 7 when the base base 3 is fixed to the concrete pit using the anchor nuts n21 to n24 are respectively between the anchor nuts n22 and n11 and the anchor nut n24. It is provided in a state spaced apart from the anchor nuts n13 and n24 by a fixed distance P2. When the foundation base 3 is fixed to the concrete pit using the anchor nuts n21 to n24, the pit cover 7 is fixed to the concrete pit 1 using the anchor nuts n15 and n16 and the anchor nuts n11 and n13.

  When the foundation base 3 and the pit lid 7 are fixed to the concrete pit 1, the foundation base 3 and the pit lid are screwed into a predetermined anchor nut by screwing a bolt penetrating a mounting hole provided in the foundation base and the pit lid. 7 is fastened to the concrete pit 1. In this specification, the bolts screwed into the anchor nuts n11 to n16 and n21 to n26, respectively, are denoted by reference numerals b11 to b16 and b21 to b26. In addition, the thing of the same specification is used as each anchor nut, and what can be screwed together in any anchor nut is used as each bolt.

  The illustrated outer box 4 includes an outer box body 400 (see FIG. 6) that has four side surfaces 4a to 4d and a ceiling surface 4f, and is configured to have a rectangular parallelepiped shape as a whole. In this embodiment, the side surface 4a of the outer box 4 is the front surface of the outer box, and the side surface 4c facing away from the side surface 4a is the back surface of the outer box. The side (front) 4a of the outer box main body 400 is provided with an operation opening 401 (see FIG. 6) used when operating the equipment in the outer box (the switch unit 5 in this embodiment). On the other three side surfaces 4b to 4d of the main body 400, window portions 402 to 404 functioning as work openings are provided near the lower ends of the respective side surfaces. The window parts 402-404 are comprised by cutting out a part of steel plate which comprises the side surfaces 4b-4d in a rectangular shape. The bottom of the outer box body 400 is an opening that can be opened in the hole 102 of the concrete pit 1.

  The illustrated outer box main body 400 includes, for example, a ceiling plate that forms a ceiling surface 4f at the upper end of a structure formed by bending a steel plate into a U-shape so as to constitute three side surfaces 4b to 4d adjacent to each other. And a reinforcing material that reinforces the box from the inside as necessary.

  As seen in FIG. 6, the opening 401 of the outer box body 400 is formed to have a frame shape having edges 401 a to 401 d. The left and right edge portions 401a and 401b of the frame are integrally formed with the structure constituting the side surfaces 4b to 4d of the outer box body, and the edge portion 401c constituting the upper end of the frame is a ceiling plate constituting the ceiling surface 4f. It is integrally formed. An edge 401d at the lower end of the opening 401 is configured by a door pressing member 8 (see FIG. 7) that functions to lock the door, which will be described later, in a closed state. The door pressing member 8 is detachably provided, and the lower end of the opening 401 can be opened downward by removing the door pressing member 8 (by removing the edge 401d).

  A door 410 (see FIGS. 1, 2, 4, and 5) that closes the opening 401 so as to be freely opened and closed is attached to an edge 401 b of the operation opening 401 of the outer box body 400 via a hinge (not shown). It has been. Inside the door 410, there is provided a lock mechanism having a latch that is removably inserted into a hole insertion hole provided in the door presser plate 8, and an operation handle 411 for operating the lock mechanism is provided on the outside of the door 410. Is detachably provided.

  Three rectangular cover plates 9A to 9C that respectively close the window portions 402 to 404 are detachably attached to the three side surfaces 4b to 4d formed with the window portions 402 to 404 of the outer box main body 400, respectively. . In the present embodiment, in order to attach the cover plates 9A to 9C to the side surfaces 4b to 4c of the outer box body, nut plates provided with nuts on the inner sides of the side walls constituting the side surfaces 4b to 4c of the outer box body (see FIG. (Not shown) are fixed by screws or the like, and are screwed into nuts provided on corresponding nut plates through the cover plates 9A to 9C and the side walls 4b to 4c of the outer box body respectively. The cover plates 9A to 9C are detachably attached to the side surfaces 4b to 4c of the outer box main body by the screws 10. Each cover plate is configured to be detachably attached to any of the three side surfaces of the outer box body 400 where the window portion is provided.

  In the present invention, one of the three cover plates 9A to 9C is provided with a pressure release part 900 (see FIG. 3) for releasing the pressure in the outer box 4. The pressure release unit 900 shown in FIG. 3 includes a pressure release unit configuration window 901 provided on one cover plate (the cover plate 9B in the illustrated example), and a pressure release attached so as to close the window 901. It consists of a pressure plate 902. The pressure release plate 902 is made of a plate on which a louver 902a is formed in order to provide air permeability, and is welded to the peripheral portion of the window portion 901 of the lid plate 9B. In this embodiment, the louver 902a is provided in order to give the pressure release plate 902 air permeability. However, a number of holes may be provided in the pressure release plate 902 instead of the louver 902a.

  In this embodiment, the cover plate 9B provided with the pressure release part 900 is attached to the back surface of the outer box body, but the cover plate 9B can be attached to any of the three side surfaces 4c to 4d of the outer box body 400. Therefore, the pressure relief unit 900 can be provided on any one of the three side surfaces of the outer box body 400.

  The outer box body 400 is disposed on the foundation base 3 fixed to the concrete pit 1, and the lower end thereof is fixed to the foundation base 3 by an appropriate means. As shown in FIG. 9, the base base 3 used in the present embodiment is provided so as to extend in parallel with each other, and is arranged along two opposite sides of the lower end of the outer box body 400. And the second strip plate portions 3A and 3B, and one end in the longitudinal direction of the first strip plate portion 3A and one end in the longitudinal direction of the second strip plate portion 3B are connected to each other. It has a third band plate portion 3C arranged along one side perpendicular to the two sides at the lower end of the box body so as to exhibit a U-shape when viewed from above. Is formed.

  In the illustrated base base 3, when the lower end of the outer box body 400 is placed thereon, both ends of the first and second band plate portions 3 </ b> A and 3 </ b> B and a part of the connecting portion 3 </ b> C are connected to the outer box body 400. Anchor nuts n11 to n14 or anchor nuts n21 to n24 for fixing the base base 3 to the concrete pit 1 at portions protruding from the lower end of the outer box body 400 at the four corners of the base base 3 Four mounting holes ha to hd for passing through the bolts b11 to b14 or b21 to b24 screwed into the center are provided with their centers positioned at the four apexes of the square. In the illustrated example, attachment holes ha, hb and hc, hd are formed at both ends in the longitudinal direction of the first strip plate portion 3A and both ends in the longitudinal direction of the second strip plate portion 3B, respectively.

  When fixing the outer box 4 to the concrete pit 1, as described above, in order to be able to point the door 410 of the outer box 4 in any of four directions different by 90 degrees, The four first group anchor nuts n11 to n14 and the second group anchor nuts n21 to n24 used for fixing to the concrete pit 1 are positioned at four vertices of a square whose center is assumed on a horizontal plane. The four mounting holes ha to hd of the base base 3 are aligned with any of the four first group anchor nuts n11 to n14 and the second group anchor nuts n21 to n24. Provided to get.

  In the present embodiment, in order to support the switch unit 5 with respect to the base base 3, the installation base 6 is fixed to the base base 3. As shown in FIG. 6, the installation base 6 extends along the longitudinal direction of each of the first strip plate portion 3 </ b> A and the second strip plate portion 3 </ b> B of the base base 3 (perpendicular to the paper surface of FIG. 6). A pair of base metal fittings 601 and 602 provided so as to extend in a certain direction) and both ends of the one base metal fitting 601 in the longitudinal direction. Two leg portions 603 and 603 (only one of the two leg portions 603 appear in the figure) whose lower ends are fixed to each other, and the other base metal fitting 602 are arranged at intervals in the longitudinal direction. And two leg portions 604, 604 (only one of the two leg portions 604 appears in the figure) with the lower ends fixed to both ends in the longitudinal direction of the other base metal fitting 602. , These four legs 603, 603, 604, 604 And a frame portion 605 which is fixed to an end. The installation base 6 is fixed to the base base 3 by bolting the pair of base metal fittings 601 and 602 to the first band plate portion 3A and the second band plate portion 3B of the base base 3, respectively, and the frame portion 605. The switch unit 5 is supported on the top.

  As shown in FIG. 7, the door pressing member 8 described above includes a substrate portion 801, an upright portion 802 that rises upward from one end in the width direction of the substrate portion 801, and an upper end of the upright plate portion 802 toward the substrate portion 801 side. A bent portion 803 bent at a right angle and a positioning plate 804 welded to the lower surface of the substrate portion 801 are provided. The door retainer plate 8 is positioned by placing the substrate portion 801 on top of the first and second strip plate portions 3A and 3B of the base base 3 (portions protruding outward from the front surface of the outer box main body 400). The plate 804 is disposed in a state of being fitted between the front end portions of the first and second strip plate portions 3A and 3B of the base base 3, and passes through mounting holes 805 and 805 provided at both ends of the upright portion 802. The bolts 806 and 806 thus made are fixed to the installation base 6 by screwing them into the screw holes provided in the base fittings 601 and 602 of the installation base 6.

  When installing the ground-mounted electric device of this embodiment in the concrete pit 1, first, depending on the local situation, the direction in which the door 410 of the outer box 4 faces and the outside of the opening of the concrete pit 1 with respect to the longitudinal direction. The position of the box 4 is determined, and the first group of anchor nuts n11 to n14 or the second group fixed to the concrete pit 1 according to the position where the outer box 4 is installed in the mounting holes ha to hd of the base base 3 The base base 3 is fixed to the concrete pit 1 by screwing bolts, which are aligned with the anchor nuts n21 to n24 of the base base 3 and pass through the mounting holes ha to hd of the base base 3, respectively, into predetermined anchor nuts.

  In the example shown in FIGS. 1 to 6, the door 410 of the outer box 4 is placed in the longitudinal direction of the opening 101 at a position near one end in the longitudinal direction of the opening 101 of the concrete pit 1 (position near the upper end in FIG. 5). As shown in FIG. 5, the mounting holes ha, hb, hc, and hd of the base base 3 are aligned with the anchor nuts n11, n12, n13, and n14, respectively. The base base 3 is fixed to the concrete pit 1 by screwing bolts b11 to b14 penetrating through the mounting holes ha to hd of the base 3 into anchor nuts n11 to n14 (see FIG. 8 for the arrangement of the anchor nuts). Yes.

  After fixing the installation base 6 to the foundation base 3 fixed to the concrete pit 1 and installing the switch unit 5 on the installation base 6, the installation base 6 and the switch unit 5 are accommodated inside the outer box body 400. In this state, the outer box body 400 is placed on the base base 3, and the lower end of the outer box body 400 is bolted to the base brackets 601 and 602 of the installation base 6, so that the lower end of the outer box body 400 is attached to the base base 3. Fix against.

  Thereafter, the cable raised from the underground gutter is introduced into the outer box and connected to the switch unit 5 in the outer box, and the door holding member 8 is bolted to the base brackets 601 and 602 of the installation base 6 with bolts 806. The edge 401d at the lower end of the opening of the outer box body 400 is configured. In the state where the door pressing member 8 is fixed to the installation base 6 in this way, the bolt insertion hole 807 (see FIG. 7) provided in the door pressing member 8 is attached to the inside of the door 410 in the closed position. The position of the hole insertion hole 807 is set so as to be arranged at a position where the lower end can be received. 2 and 4, the illustration of the door pressing member 8 is omitted.

  After the outer box 4 is installed on the concrete pit 1 as described above, an uneven portion 7a for preventing slippage is formed on the upper surface of the opening 101 of the concrete pit 1 that is not blocked by the outer box 4. The pit lid 7 is closed. When the outer box is installed as described above, the pit lid 7 is provided with bolts b21, b23, b25 and b26 penetrating through the mounting holes provided at the four corners thereof in the concrete pit 1 as shown in FIG. The anchor nuts n21, n23, n25 and n26 are fixed to the concrete pit 1 by screwing.

  In the present embodiment, four anchor nuts provided in the concrete pit 1 for fixing the foundation base 3 and four mounting holes provided in the foundation base for penetrating bolts screwed into these anchor nuts. Are arranged so as to be located at the apex of the square, the door 410 is arranged in one direction and the other direction along the longitudinal direction of the concrete pit 1 and one direction and the other direction along the width direction of the concrete pit 1. The outer box 4 can be fixed to the concrete pit 1 in any direction.

  For example, when the outer box 4 is installed in a direction rotated 90 degrees counterclockwise with respect to the installation position of FIG. 5, the mounting holes ha, hb, hc and hd provided in the base base 3 are provided. As shown in FIG. 11, bolts b12, b14, b11 and b13, which are respectively passed through the mounting holes ha, hb, hc and hd of the base base 3, are aligned with the anchor nuts n12, n14, n11 and n13, respectively. The foundation base 3 may be fixed to the concrete pit 1 by screwing into the anchor nuts n12, n14, n11, and n13.

  Further, by fixing the base base 3 to the concrete pit 1 using the second group of anchor nuts n21 to n24, the outer box 4 is fixed in the longitudinal direction of the opening 101 with respect to the installation position shown in the above embodiment. The outer box 4 can be installed at a second installation position separated by a distance, and the door 410 of the outer box can be directed in four different directions at 90 degrees from each other.

  As described above, according to the present embodiment, the position of the outer box along the longitudinal direction of the opening 101 of the concrete pit 1 is shifted to the position closer to one end in the longitudinal direction of the opening 101 and the other end. 12 (A) to (D) and FIG. 13 (D), because the outer box door 410 can be directed in four directions at each set position. As shown in A) to (D), a total of eight kinds of positional relationships can be provided between the outer box 4, the pit lid 7, and the concrete pit 1 without changing the specifications of the outer box. Therefore, ground-mounted electrical devices installed at various different installation locations can be configured using outer boxes with the same specifications, and costs can be reduced by standardizing the outer boxes.

  Moreover, since it comprises as mentioned above, since the pressure release part 900 of the outer box 4 can be provided in any surface of three side surfaces 4b-4d other than the surface in which the door was provided, outside of a ground installation type electric equipment When installing the box 4 on the sidewalk, as well as when installing it at a place other than the sidewalk, the outer box door 410 and the pressure release unit can be used according to the situation of the installation location without changing the specifications of the outer box. 900 can be arranged in a state in which it is oriented in a direction that does not hinder safety in accordance with local conditions.

  In the above description, the foundation base 3 is first attached to the concrete pit 1, the switch unit 5 is supported on the foundation base 3 via the installation base 6, and then the outer box body 400 is arranged on the foundation base 3 to install the foundation base 3. The ground-mounted electrical device 2 is installed on the concrete pit 1 by being fixed to 6, but the way of installing the ground-mounted electrical device 2 is not limited to the above example. For example, the switch unit 5 is supported on the foundation base 3 via the installation base 6, and the outer box body arranged on the foundation base 3 is fixed to the installation base 6 to assemble the ground-mounted electric device 2. After that, the foundation base 3 of the ground-mounted electric device 2 may be fixed to the concrete pit 1.

  In the above embodiment, the both ends of the first band plate portion 3A and the second band plate portion 3B of the base base 3 are provided so as to protrude outward from the lower end of the side surface of the outer box body 400, and The attachment holes ha to hd are provided at both ends of the first strip plate portion 3A and the second strip plate portion 3B that protrude outward from the lower end of the side surface, but the first strip plate portion 3A and the second strip 2 of the base base 3 are provided. The both ends of the band plate portion 3B are provided so as not to protrude outward from the lower end of the side surface of the outer box body 400, and the attachment holes ha to hd are provided in a state of being located inside the outer box body 400. Good. In such a configuration, as in the above-described embodiment, after the foundation base 3 is first fixed to the concrete pit, the switch body 5 is supported on the foundation base via the installation base 6, and It is preferable that the ground-mounted electric device 2 is assembled by the procedure of arranging the box body 400 and fixing the outer box body 400 to the installation base.

  Moreover, in said embodiment, although the base 3 was formed in U shape, this invention is not limited to the case where the base 3 is formed in U shape. For example, it is also possible to use a frame-shaped foundation base formed so that the outer edge exhibits a regular quadrangle when viewed from above.

  The arrangement of the anchor nut provided in the concrete pit 1 is not limited to the arrangement shown in FIG. 8, and the arrangement of the anchor nut is appropriately changed according to the desired installation position of the outer box on the concrete pit 1. be able to.

  For example, in order to fix three or more installation positions by shifting the position in the longitudinal direction of the concrete pit 1 and fix the base base 3 at each installation position, three or more groups of anchor nuts are provided in the concrete pit. Also good.

  In the above embodiment, a part of the anchor nut used to fix the foundation base 3 to the concrete pit also serves as the anchor nut used to fix the pit lid to the concrete pit. You may make it provide separately the anchor nut used in order to fix, and the anchor nut used in order to fix the foundation base 3 to a concrete pit.

  In each of the above embodiments, an anchor nut is provided in the concrete pit 1, and the foundation base 3 is fixed to the concrete pit 1 by screwing a bolt penetrating a mounting hole provided in the foundation base 3 into the anchor nut. However, the anchor base is fixed to the concrete pit 1 by fixing the anchor bolt to the concrete pit 1 and screwing the nut into the anchor bolt penetrating the mounting hole provided in the foundation base 3. May be.

  In each of the above-described embodiments, a ground-mounted multi-circuit switch is taken as an example of a ground-mounted electrical device to which the present invention is applied. However, a configuration is provided by housing components in an outer box installed on the ground. The present invention can also be applied to other electrical equipment that is used, for example, a ground-mounted transformer device.

DESCRIPTION OF SYMBOLS 1 Concrete pit 101 Concrete pit opening 2 Ground installation type electric equipment 3 Foundation base 4 Outer box 4a-4d Side of outer box 400 Outer box main body 401 Opening in front of outer box main body 402 Window formed in side 4b 403 Window portion provided on side surface 4c 404 Window portion provided on side surface 4d 410 Door for opening / closing opening 401 n11-n14 First group anchor nut n21-n24 Second group anchor nut b11-b14 First group Bolts screwed into the anchor nuts b21 to b24 Bolts screwed into the second group of anchor nuts ha to hd Mounting holes provided in the base base

Claims (5)

A foundation base disposed on a concrete pit having a rectangular opening and fixed around the opening of the concrete pit by a bolt; an outer box formed in a rectangular parallelepiped shape and disposed on the foundation base; In a ground-mounted electric device comprising a component of an electric device arranged in an outer box and supported with respect to the base base,
The outer box has an opening on one side surface and a window on each of the other three side surfaces, and the outer box is disposed on the base base in a state in which the components of the electric device are accommodated therein. A box body, a door for closing the opening of the outer box body so as to be openable and closable, and three cover plates for closing three windows respectively provided on the three side surfaces of the outer box body, One of the three lid plates is provided with a pressure release part for releasing the pressure in the outer box,
Each cover plate of the outer box is configured such that it can be detachably attached to any of the three side surfaces provided with windows of the outer box body,
The base base is provided with four mounting holes for penetrating bolts for fixing the base base to the concrete pit with the respective centers positioned at the four vertices of a square. about,
Ground-mounted electrical equipment characterized by The base base is provided so as to extend in parallel with each other, and is disposed along two opposing sides of the lower end of the outer box body, and the first band plate Provided so as to connect between one end in the longitudinal direction of the portion and one end in the longitudinal direction of the second band plate portion, along one side perpendicular to the two sides at the lower end of the outer box body And a third belt plate portion arranged in such a manner that when viewed from above, a U-shape is formed,
The ground-mounted electrical device according to claim 2, wherein the mounting holes are formed at both ends in the longitudinal direction of the first band plate portion and at both ends in the longitudinal direction of the second band plate portion.   The ground-mounted electrical device according to claim 1 or 2, wherein the bolt that penetrates the mounting hole of the foundation base is a bolt that is screwed into an anchor nut provided in the concrete pit.   The ground-mounted electric device according to claim 1 or 2, wherein the bolt that passes through the mounting hole of the foundation base is an anchor bolt fixed to the concrete pit.   The said pressure release part is provided with the pressure release plate attached so that it might close the window part provided in one of the said 3 cover plates with a louver or many holes. The ground-mounted electrical device according to any one of the above.

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