JPH0229773Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the improvement of an underground wiring box used to connect underground power cables or to lead them into a distribution box installed above ground. It is.

(Conventional technology) Underground wiring, in which power cables are buried underground, is gradually becoming popular in factories, housing complexes, etc., but underground wiring boxes with openable lids are used for underground wiring. It is common practice to bury them to connect power cables, distribute power, etc. (For example, Tokko Akira
(Publication No. 43-27036) (Problem to be solved by the invention) However, this type of conventional underground wiring box has a horizontal lid installed at a level with the ground or a little lower than that, so the lid is It is easy for people to get on top of it,
In this case, the entire weight of the person will act perpendicularly to the lid surface, so the lid and the opening that supports it must have great mechanical strength to withstand the human load. If the middle wiring box is made of synthetic resin, there is the problem that it must be made extremely thicker than necessary to satisfy its original function. Since a hole is drilled in the side wall surface and the cable is introduced through this hole, there are various problems such as the use of a cable protection tube requires a lot of work to pull in the cable and the safety is insufficient.

(Means for Solving the Problems) The underground wiring box according to the present invention, which attempts to solve the above-mentioned problems, is provided with a protruding part having an upwardly expanding slope at the lower part of the required side wall part. A slope is formed on the upper surface of the main body of the box with an insertion part for the cable protection pipe on the slope, which slopes upward at an angle of 15 to 45 degrees to the ground surface, and an inspection hole with a lid is provided on the slope. It is characterized by:

(Embodiments) Next, the present invention will be described in detail with reference to illustrated embodiments.

1 is mainly a box made of synthetic resin such as polyethylene, polypropylene, FRP, etc., and is buried underground with only the upper end having an opening exposed above the ground as shown in the figure. Reference numeral 2 indicates a wiring hole provided on the horizontal portion of the top surface of one side of the box main body 1, and reference numeral 3 indicates an upwardly inclined surface 1a formed on the top surface of the other side of the box main body 1 toward the edge of the hole 2. This is an inspection hole with a lid 4 made of synthetic resin. Note that this upwardly inclined surface 1a is set at an angle of 15 to 45 degrees with respect to the ground surface. Furthermore, an electrical equipment storage box 5 such as a power distribution box is attached to the box main body 1 above the hole 2. Further, on three lower sides of the side wall part 6 buried in the ground of the box main body 1, there are protruding parts 8 made of separately molded synthetic resin whose lower side corresponding to the underground side is an upwardly expanding slope 7. A molded body is provided by fastening with bolts 9 to the lower opening periphery of the side wall of the box main body 1, and a cable protection pipe 10 buried underground is inserted and held in each slope 7 to form the box main body 1. A spindle-shaped bushing serves as an insertion part 11 for retraction into the interior of the box body 1 at right angles to the slope 7, i.e.
The middle part is fitted into a hole formed in the slope so as to be inclined with respect to the side wall part 6 of the plate, and the tip part is oriented toward the hole 2. Note that the bushing as the insertion part 11 of this cable protection tube has sealing members 12 made of epoxy resin at both ends as shown in the figure.
The cable protection tube 10 is pulled in from obliquely downward in the axial direction of the bushing, and only the power cable 14 in the center is inserted into the box main body 1 from the inner end of the bushing. It is pulled out into the inside of the box and bent upward into an electrical equipment storage box such as a power distribution box.

(Function) With this structure, the box main body 1 is buried in the ground with only the upper end portion having the opening exposed above the ground, and the lower protruding portion 8 of the side wall portion 6 buried in the ground is removed. The cable protection tube 10 is drawn into the box main body 1 from the cable protection tube insertion part 11 on the upwardly expanding slope 7 formed on the lower side, and the power cable 14 in the center is bent upward to open the box. Wiring is connected to the power distribution box above the hole 2 through the hole 2 provided on the upper surface of one side of the main body 1, and the cover 4 of the inspection hole 3 provided on the upper surface of the box main body 1 is opened for inspection and repair. However, as described above, the insertion part 11 of the cable protection tube is located on the upwardly expanding slope 7 formed on the lower side of the lower protrusion 8 of the side wall part 6.
Since the cable protection tube 10 is drawn into the inside of the box main body 1 from the inside, the tip of the cable naturally points upward, making the drawing process easy, and the insertion part 11
The vicinity is protected from above by the protruding part 8, so safety is excellent, and the inspection hole 3 is
Since it is provided on the upper surface of the slope 1a that slopes upward at an angle of 15 to 45 degrees with respect to the ground surface, inspection is easy and it is difficult for people to get on the cover 4 of the inspection hole 3. Even when riding on the lid 4, the load is divided into a connection component in a direction parallel to the surface of the lid 4 and a vertical component in a direction perpendicular to the surface of the lid 4, so that the load acting perpendicularly to the lid 4 is reduced. Therefore, there is no need to increase the mechanical strength of the lid 4 and the edge of the inspection hole 3 corresponding to its periphery more than necessary, and the wall thickness can also be reduced. Note that this angle limitation is important because if the inspection hole 3 is less than 15 degrees relative to the ground surface, the load dispersion effect will be poor, and if it exceeds 45 degrees, inspection will be difficult.

(Effect of the invention) As is clear from the above explanation, the present invention forms a protrusion below the side wall, and connects the cable protection pipe from the insertion part of the cable protection pipe on the upwardly expanding slope below the protrusion. Since the cable is designed to be pulled into the inside of the box main body 1, the cable tip naturally points upward, making it easy to pull in, and the vicinity of the insertion part is protected from above by a protrusion, providing excellent safety. Furthermore, by providing the inspection hole on at least a part of the top surface of the main body of the box on a sloped surface that is inclined upward at an angle of 15 to 45 degrees with respect to the ground surface, it is possible for people to ride on the cover of the inspection hole. This reduces the possibility of tripping or stepping on the lid, and also reduces the load perpendicular to the lid even if someone gets on it. The lid and its periphery, which had previously been formed thicker than necessary for its original function, can be made thinner, and this type of fabric has the advantage of being superior in terms of design. Its practical value is extremely great as it solves the problems of intermediate wiring boxes.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway side view thereof. 1: Box main body, 1a: Inclined surface, 3: Inspection hole, 4:
Lid, 7: upwardly expanding slope, 8: protrusion, 11:
Cable protection tube insertion part.

Claims (1)

[Scope of utility model registration request] An upwardly expanding slope 7 at the lower part of the required side wall 6
A slope 1a is formed on the upper surface of the box main body 1, which has a protrusion 8 having a slope 7 and an insertion portion 11 for a cable protection pipe, and slopes upward at an angle of 15 to 45 degrees with respect to the ground surface. An inspection hole 3 with a lid 4 is installed on the inclined surface 1a.
An underground wiring box characterized by being provided with.