JPH0747954Y2 - Buried box for electrical installation - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] This proposal relates to a buried box for electric installation.

[0002]

2. Description of the Related Art Conventionally, a corrugated hard polyethylene pipe duct 8 has been used to bury a cable underground.
When connecting the cable duct 8 to the ground, a cement concrete burying box 2 having an inlet 1 on its upper surface is used. A thin knockout portion 2 ″ is provided on the wall 2 ′ of the burying box 2, and the opening of the knockout portion 2 ″ is perforated by an electric tool or human power (FIG. 7).

A plurality of bell mouths 1 are suspended in the opening.
1 was arranged, the duct 8 made of the above-mentioned hard polyethylene pipe was screwed to each of the bell mouths 11, and the opening was closed with cement mortar 12 (FIG. 8).

Such work requires a lot of labor and skill, and it is difficult to cut the tip of the duct 8 so as to match it with the inner surface of the box wall 2 '. There is a tendency that the position of the bell mouth 11 protrudes inside the box wall 2 '(shown by phantom lines in Fig. 8), and the inner volume of the burying box 2 becomes narrow, which hinders the entrance and exit of people and work inside the box. There was a problem that

[0005]

[Problems to be Solved by the Invention]
The purpose of the present invention is to support the ends of the plurality of cable ducts 8 on the box wall 2'in a uniform manner and to connect the plurality of cable ducts 8 in the handhole easily without requiring any skill.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention is a concrete burying box having an entrance provided on the upper surface thereof, in which a concrete opening is formed in a wall of the box and the opening is formed by a piercing plate material. Ri Na closed with, drilled in drilling for plate
Fit a short tube with an engaging flange at the inner end into the through hole,
The outer surface of the flange has a trumpet shape, and the inner end side of the short cylinder
Cable stopper inserted from the outer end side
Forming and burying box for electrical installation where the cable duct is spiral
A ring having a smaller diameter than the diameter of the through hole and a flange at the inner end.
The electric cable according to the above invention, in which the short cylinder is fitted through the spacers.
It consists of a buried box for construction.

[0007]

[Action] is drilled a plurality of holes 5,5,5 in drilling material 4 which closes the opening 3 in the merits, placed concrete buried box making 2 which was inserted into the pits excavated on the ground surface To do.

In that state, from the inside of the box wall 2 ', the short cylinders 7, 7, 7
Are fitted into the through holes 5, 5, 5 and inserted through the outside, and the engaging flanges 6 are engaged with the inner side surfaces of the through holes 5, respectively, and the adhesive 14
Fix with.

When the diameter of the short cylinder 7 is smaller than the diameter of the through hole 5, an annular spacer 10 is interposed as shown in FIGS. 2 and 3, and the spacer 10 and the plate member 4 are fixed with an adhesive 14 '. The short cylinder 7 is fitted into the annular spacer 10 and fixed with the adhesive 14 as described above.

The cable duct 8 is inserted from the outer end of the short tube 7 as described above from the tip, and the tip is supported at a fixed position by the stopper 9 in the short tube 7, and the cable 15 in the duct 8 ( 1) is extended into the burial box 2 and the pits are backfilled.

[0011]

EXAMPLE An inlet 1 is formed on the upper surface of a rectangular or rectangular cement concrete burying box 2 to form a handhole or manhole. This burial box 2 is of course a bottomed and spiral shape
A rectangular knockout portion for inserting the tip of the buried cable duct 8 is opened 3 in the box wall 2'in advance. The opening 3 is closed by a perforating plate 4 made of a hardened synthetic resin plate or the like.

The plate member 4 has a rectangular shape and its outer periphery is detachably fixed to the box wall 2'by a plurality of bolts 13, and a plurality of circular through holes 5 can be punched as shown in FIGS. 4 and 6. . A short cylinder 7 made of vinyl chloride or the like having a trumpet-shaped engagement flange 6 at the inner end is fitted and inserted into the through hole 5 from the inner side to the outer side, and the trumpet-shaped engagement flange 6 is drawn to the inner surface of the box wall 2 '. Hang

The tip end stopper 9 of the bellows-shaped duct 8 for the cable 15 inserted and fitted from the outer end side into the inner end side of the short cylinder 7 is formed in a step shape or a flange shape. Figure translucent hole 5 when the flange 6 is not hooking et diameter MataToruana 5 large than the diameter of the short tube 7 2, through holes as shown in FIG. 3
It is possible to interpose an annular spacer 10 having an inner diameter smaller than the inner diameter of 5 and engage the flange 10 ′ of the spacer 10 with the inner surface of the plate member 4 to fix it with an adhesive 14 ′.
The caulking 16 enters the spiral of the duct 8 and prevents water from entering from the outer end of the short tube 7 . In addition, what is shown by 17 in the drawing
The waterproof tape, 18 is the iron lid of the manhole 1.

[0014]

Since the present invention is constructed as described above, it is installed in the pit with the opening 3 of the burying box 2 closed by the perforating plate 4, and the through hole formed in the plate 4. It is possible to insert the embedded cable 15 into the burying box 2 very simply by inserting the short tube 7 into the short tube 7 and inserting the cable duct 8 into the short tube 7, requiring manpower and skill. No
There is an effect that the construction period is shortened, and there is no internal bulge in the knockout portion, and there is no fear of reducing the internal volume of the burying box 2. In addition, the cable 15 is attached by the trumpet-shaped engaging flange 6.
There is no risk of being damaged by the caulking, and caulking can be inserted into and attached to the spiral of the duct 8 to have a waterproof effect in the box 2 .

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view of a box wall opening of a buried box for electric installation of the present invention.

FIG. 2 is a perspective view of an annular spacer.

FIG. 3 is a cross-sectional view of a through hole and an annular spacer.

FIG. 4 is an exploded perspective view of an opening, a plate member for perforation, and a short cylinder.

FIG. 5 is a perspective view of a perforated plate member and a short cylinder in an attached state.

FIG. 6 is a front view of another embodiment of the punching plate material.

FIG. 7 is a perspective view of a conventional handhole.

FIG. 8 is a side view of a connected state of a bell mouth and a duct.

[Explanation of symbols]

1 Entrance 2 Concrete burying box 2'Box wall 3 Opening 4 Plate material for perforation 5 Through hole 6 Engaging flange 7 Short tube 8 Cable duct 9 Stopper 10 Annular spacer 10 ' Flange

Claims (2)

[Scope of utility model registration request] 1. A concrete burying a box formed by providing the inlet on the upper surface, the concrete opening is formed in a box wall, Ri Na closes the opening in the perforated plate material for, drilling plate
Fit a short tube with an engaging flange at the inner end into the through hole drilled in
The outer surface of the flange has a trumpet shape,
The cable duct switch inserted from the outer end to the inner end
An electrical installation that forms a topper and that has a spiral cable duct
Buried box for use. 2. A through hole having a diameter smaller than the diameter of the through hole and a flare at the inner end.
Contract to fit a short cylinder through an annular spacer with a flange
A buried box for electrical installations according to claim (1).