JPH0537602Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a basic block for an outer box for electrical equipment such as a distribution tower installed on a street or the like.

(Prior art) The depth of outer boxes for electrical equipment such as power distribution towers installed on streets such as sidewalks should be made as small as possible in order to avoid reducing the effective area of roads such as sidewalks as much as possible. requested. Therefore, these outer boxes are placed. Foundation blocks buried underground are similarly required to have a small depth. However, the cable brought into the foundation block from underground cannot be bent below a certain radius, so a thin foundation block with a small depth is used as in Utility Model Publication No. 62-37364, and the lower front of the block is open. This allows the cable to be drawn in from this open front.

(Problem to be solved by the invention) However, in this Utility Model Publication No. 62-37364, the front lower part of the foundation block is open, so
Over the years, surrounding earth and sand enters into the foundation block, and due to the uneven pressure of the surrounding earth and sand, the foundation block tilts to one side in the soil, and the outer box for electrical equipment placed on top of it also tilts. There is a risk.

Therefore, the purpose of this invention is to provide a foundation block that is thin and has a small depth, allows cables to be curved and inserted from the front surface, and prevents dirt from penetrating inside.

(Means for solving the problem) In this invention, a box-shaped block with an open top is provided, and an appropriate number of cable insertion holes are bored on appropriate sides of the box-shaped block, and some of these holes are The flange plate of the short cylindrical protective tube connecting fitting is overlapped and bolted to the outer periphery of each of these packing plates, and the other cable insertion holes are overlapped with the side surface. It is covered with a blind cover and bolted. Further, insert nuts are provided at several appropriate locations on the upper end surface of this box-shaped block.

Stack the appropriate number of lower blocks with a U-shaped plane on top of this box-shaped block, with the opening facing the front.
Each of these lower blocks is provided with upper and lower through holes at positions corresponding to the insert nut locations on the upper end surface of the box-shaped block. Further, front lower block members are pressed against both front surfaces of each lower block to close the openings of each of these lower blocks.

Further, on the upper surface of these lower blocks, middle blocks having a U-shaped plane are stacked. This middle block has a large width on both sides, and each inner side thereof protrudes inwardly from both inner side surfaces of the lower block and the like. This middle block also has a through hole at a position corresponding to the through hole in the lower block, and a long bolt inserted from the upper end face of the middle block passes through the through hole in each lower block and passes through the upper part of the box-shaped block. It is screwed into an insert nut on the end face, and the box-shaped block, lower block, and middle block are integrated. The opening of this middle block is closed by providing a front middle block material, and both ends are bolted to the middle block.

Furthermore, an insert nut is buried in the upper surface of this middle block. Further, on the upper surface of this middle block, upper blocks having a U-shape in plan are stacked, upper and lower through holes are provided in the recesses bored at the upper end of the upper blocks, and bolts with their heads inserted in these recesses are inserted. The upper block is fixed to the middle block by screwing into the insert nut of the middle block through the through hole. The upper part of the upper front plate, whose lower part is bolted to the front middle block material, protrudes from the front opening of the upper block and closes the opening. Furthermore, a suitable number of insert nuts are buried in the upper end surface of this upper block, and the bottom frame of the outer box of the electrical equipment is placed and fixed on the upper end of this upper block.

(Operation) This foundation block is placed in a hole drilled in the soil and buried with the upper end of the upper block positioned above the ground surface.

Then, the bottom frame of the outer box for electrical equipment is placed on the upper end surface of the upper block, and the bottom frame is bolted using the insert nuts of the upper block. In this way, the outer box is fixed on the street.

In addition, cables that are drawn into or out of this foundation block are passed through the cable insertion hole on the side of the box-shaped block of this foundation block by tearing the packing plate, and the underground cable to be introduced or led out is passed through the protective pipe. In this case, the ends of the protective tubes are brought into contact with the protective tube connecting fittings on the side of the box-shaped block, a ring-shaped joint material is covered and fixed from above, and the cables are passed through these protective tubes and placed inside the foundation block. Pull in or pull out.

(Example) An example of this invention will be described below with reference to the drawings.
A box-shaped block 1 whose top surface is open is provided. A suitable number of cable insertion holes 2 are bored in the front and both sides of the box-shaped block 1. The cable insertion hole 2 on the front side is closed with a packing plate 3 superimposed on the front outer surface of the box-shaped block 1 as shown in FIGS. The flange plates 4a of the protective tube connecting fittings 4, which are shaped like the outer ends and open outward, are stacked on top of each other and fixed with bolts 5 at the relevant locations. Also, cable insertion holes 2 on both sides
As shown in Figs. 3 and 4, the box side block 1
It is closed with blind covers 6 superimposed on the outer surfaces of both sides, and fixed with bolts 7. In addition, the bottom plate 1a of this box-shaped block 1 is sloped so that the center part is lower.
A drain hole 8 is provided in the center. Furthermore, insert nuts 9 are provided at four locations on the upper end surface of the box-shaped block 1.

On the upper surface of this box-shaped block 1, two lower blocks 10 each having a U-shaped plane are stacked with the opening facing toward the front. Each of these lower blocks 10
As shown in FIG. 6, through holes 11 passing through the upper and lower portions of each lower block 10 are provided at positions corresponding to the insert nuts 9 of the box-shaped block 1. Further, front lower block members 12 for closing the openings of each of these lower blocks 10 are stacked with both sides pressed against both front sides of each lower block 10.

A middle block 13 having a U-shaped plane is stacked on the upper surface of these lower blocks 10, and as shown in FIGS. 1 and 7, this middle block 13 has large widths on both sides. However, each inner side thereof protrudes inward from both inner side surfaces of the lower block 10. Insert nuts 14 are provided on the front end surfaces of each side. This middle block 13 also has through holes 15 that penetrate vertically at positions corresponding to the through holes 11 of the lower block 10, and as shown in FIG. A long bolt 1 passed through the hole 15 and each through hole 11 of the lower block 10
6 into the insert nut 9 of the box-shaped block 1.
It is screwed on. As a result, the box-shaped block 1, the lower block 10 and the middle block 13 are fixed together. Insert nuts 17 are embedded inside the upper end surfaces of both sides of the middle block 13. The front opening of the middle block 13 is closed with a front middle block material 18, and by pressing both sides of the front middle block material 18 against both front parts of the middle block 13, bolts 19 are tightened. Fixed.

As shown in FIG. 8, this front middle block material 18 has thin plate shapes at both ends, and has bolt insertion holes 20 for the bolts 19 at these locations. The central portion sandwiched between these thin plate-shaped portions bulges inward, and two insert nuts 21 are provided at intervals inside this bulge. Further, two handle recesses 22 are provided at an interval on the outer surface of the front middle block material 18.

On the upper surface of this middle block 13, an upper block 23 having a U-shape in plan is stacked. As shown in FIG. 9, this upper block 23 has a reinforced concrete material inside a reverse channel type fitting.
It is filled except for the lower part, and an appropriate number of recesses 24 are provided on both sides, and a through hole 25 is provided from each of these recesses 24 to the bottom. Each of these through holes 25 is provided at a position corresponding to the insert nut 17 on the upper end surface of the middle block 13. Further, an insert nut 26 is provided on the upper end surface close to each of these recesses 24. These insert nuts 26 are for bolting the bottom frame of the outer box when the outer box of the electrical equipment is placed and fixed on this foundation block. Furthermore, stopper plates 27 are provided protruding from inside the tips of both sides of the upper block 23, respectively. As shown in FIG. 3, this upper block 23 is constructed by inserting each bolt 28 from each recess 24 into each through hole 25 and screwing it into each insert nut 17 of middle block 13, so that the head of each bolt 28 is inserted into each through hole 25. It is placed in the recess 24. As a result, the upper block 23 is fixed to the middle block 13. Further, the front opening of this upper block 23 is closed with an upper front abutment plate 29, as shown in FIG.
As shown in FIG. 10, 9 is a plate having a bent edge around the periphery except for one side of the lower part, and has two holes 30 spaced apart from each other in the lower part. This upper front plate 29
As shown in FIG. 3, the bolts 31 are passed through the holes 30 in the lower part and screwed onto the insert nuts 21 of the front middle block material 18, the lower part is supported by the front middle block material 18, and the front face of the upper block 23 is fixed. It protrudes so as to close the opening, and both ends of the upper part are engaged with stopper plates 27 of the upper block 23.

In addition, the box-shaped block 1, the lower block 10,
Appropriate insert nuts 32 are embedded in the inner surface of the back plate of the middle block 13, respectively, and these insert nuts 32 are used for attaching appropriate equipment when necessary.

The foundation block of this embodiment is constructed by digging a hole in the road and burying it in the hole, with the upper end surface of the upper block 23 protruding above the ground surface. A bottom frame (not shown) of the outer box of the electrical device is placed on the upper end surface of the upper block 23, and the bottom frame is bolted using the insert nuts 26.

In addition, in order to introduce or lead out an underground cable into this foundation block buried underground, the end of the protection pipe into which the underground cable is inserted must be connected to the protection pipe connection fitting 4 provided on the front surface of this foundation block. The ends are brought into contact, and a joint material is capped and fixed around their outer peripheries in a ring shape, and the cable inside the protective tube is passed through the protective tube connecting fitting 4, the packing plate 3 is broken, and the cable is inserted into the foundation block through the cable insertion hole.

If necessary, when using the cable insertion hole 2 covered by the blind cover 6, remove the blind cover 6, attach the packing plate 3 and the protective pipe connecting fitting 4 as described above, and connect the underground cable. can be introduced.

Furthermore, if the bottom frame of the outer box for electrical equipment placed on this foundation block is larger than the upper block 23 of this foundation block, the middle block 1
1. Remove the upper block 23 from 3, and remove the upper front plate 29 from the front middle block material 18, and then turn the front middle block material 18 over so that the bulge part is on the outside, as shown in FIG. By projecting the bulges outward and fixing them with bolts 19, a frame having a diameter larger than that of the upper block 23 is obtained, and the bottom frame of the outer box for electrical equipment is attached to the middle block 13 and the front middle block material 18. In this case, the insert nut 17 of the middle block 13 can be used to bolt the bottom frame of the outer box for electrical equipment.

(Effects of the invention) This invention has the above-mentioned structure, and because the foundation block is made into a closed box type, earth and sand do not get inside, so the surrounding earth pressure does not change over time, and the foundation block slopes. It is stable without any problems. Furthermore, even if the foundation block is made thin and compact with a small depth, the cable introduced from underground or the cable led out underground can be introduced or led out through the cable insertion hole provided on the side of the foundation block. Cables whose curvature radius cannot be made small can also be used. Moreover, since this cable insertion hole is provided with a packing plate and a protective pipe connecting fitting, earth and sand will not enter through the cable insertion hole. In addition, this basic block can be constructed by stacking a lower block, a middle block, and an upper block each having a U-shaped plane on top of the box-shaped block and fixing them with bolts.
Assembly is extremely easy.

[Brief explanation of drawings]

Fig. 1 is a front view of this device, Fig. 2 is a plan view of the same, Fig. 3 is a left side view of the same section, Fig. 4 is a right side view of the same section, and Fig. 5 is a box-shaped block of this device. Fig. 6 is a plan view of the lower block and front lower block material of this invention, Fig. 7 A and B are a plan view and front view of the middle block of this invention, Fig. 8 A , B, and C are a plan view, a front view, and a side view, respectively, of the front middle block material of this invention, and FIGS. 9A and B are a plan view and a side sectional view, respectively, of the upper block material of this invention, and FIGS. B is a plan view and a front view of the upper front abutment plate of this invention, respectively, and Fig. 11 shows the assembled state with the upper block and upper front abutment plate removed and the front middle block material turned over front and back. FIG. In the figure, 1 is a box-shaped block, 2 is a cable insertion hole, 3 is a packing plate, 4 is a protective tube connecting fitting, and 6
is a blind plate, 10 is a lower block, 11 is a through hole, 1
2 is the lower front block material, 13 is the middle block, 15 is the through hole, 16 is a long bolt, 18 is the front middle block material, 23 is the upper block, 24
25 is a through hole, and 26 is an insert nut.

Claims (1)

[Scope of utility model registration request] Stack the U-shaped bottom block and the middle block in order on the top end of a box-shaped block with an open top, pass a long bolt through each through hole from the top end of the middle block, and bury the bottom end in the top end of the box-shaped block. The front opening of the lower block is closed by placing both ends of the front lower block material on both sides of the lower block, and the front opening of the middle block is closed by placing both ends of the front middle block material on both sides of the lower block. Place the U-shaped planar upper block on the upper end surface of the middle block, and pass the bolt through the through hole from the recess provided on the upper end surface of the upper block to close the upper end surface of the middle block. The opening of this upper block is closed with an upper front plate whose lower part is fixed to the front middle block material, and the upper end surface of this upper block is equipped with an outer box for electrical equipment. Insert nuts for bolting the bottom frame are provided as appropriate;
An appropriate number of cable insertion holes are drilled on appropriate sides of the box-shaped block, some of these holes are covered with packing plates stacked on the sides, and holes are formed around the outer periphery of each of these packing plates. , the collar plates of the short cylindrical protective pipe connecting fittings are overlapped and bolted together, and the other cable insertion holes are covered with blind covers stacked on the sides and bolted, and are not used for electrical equipment. Basic block of the box.