JPH0416591Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to concrete pipes used when burying electric wires etc. underground, and in particular, it is designed to easily connect concrete pipes of unit length. It is something.

[Prior Art] In recent years, burying electric wires underground to eliminate above-ground utility poles has been increasingly practiced mainly in urban areas. In order to bury this electric wire underground, it has been conventional practice to form a through hole in a concrete pipe and insert the electric wire into the through hole.

[Problems that the invention aims to solve] Concrete pipes are made by unit-length pieces that are joined as appropriate at the construction site, but conventionally, these joints are hardened with mortar, etc., which takes time and is time-consuming. If the seams were incompletely joined, there was a risk that rainwater could enter from there.

[Means for solving the problem] Therefore, the present invention solves the problem by inserting connectors having the following configurations (a) to (c) at both ends of a concrete pipe of unit length. This is an attempt to solve the problem.

(a) Each connector 3a, 3b is a concrete pipe 1
It has a rectangular frame shape that matches the shapes of the end surfaces 1a and 1b, and one connector 3a has a flange piece 4 protruding from the side wall excluding the bottom portion, which overlaps the outer periphery of the other connector 3b. 4, and a nut 10 is embedded in the other connector 3b at a position corresponding to the bolt insertion hole 5.

(b) A protruding piece 6 is provided on the bottom side of one connector 3a, and a recess 11 into which the protruding piece 6 fits is formed on the bottom side of the other connector 3b.

(c) A protrusion 12 is formed along the inner peripheral edge of the opening of one connector 3b so as to fit into the inner peripheral wall of the opening of the other connector 3a, and a gasket 13 is attached to the outer periphery of the protrusion 12. The protruding portion 12 and the inner peripheral wall of the opening are brought into close contact with each other.

[Operation] The flange piece 4 of one connector 3a is bolted to the other connector 3b, and both connectors 3a,
Since the opening of 3b is in close contact with the packing 13, the concrete pipes 1 can be connected easily and without gaps.

[Example] An example of the present invention will be described below with reference to the drawings.

The concrete pipe 1 has a rectangular prism shape with an appropriate length, and through holes 2, 2 for inserting electric wires are formed inside the pipe. Connectors 3a and 3b made of synthetic resin are integrally insert-molded into both ends 1a and 1b of the concrete pipe 1.

The connector 3a fixed to the end 1a of the concrete pipe 1 has a frame shape that is the same as the end 1a of the concrete pipe 1, as shown in FIG. Flange pieces 4, 4
It is an extension of... The flange piece 4 has a bolt insertion hole 5 bored therein. On the other hand, a protruding piece 6 having a trapezoidal cross section is provided on the bottom of the connector 3a. Note that this connector 3a has a flange piece 4.
A flange 7 facing in the opposite direction is formed, but this is for embedding the connector 3a in the concrete pipe 1 when inserting it into the concrete pipe 1, and the through holes 8, 8 of this flange 7 are ，
8... is for strengthening the connection between the flange 7 and the concrete pipe 1.

Next, the connector 3b fixed to the end 1b of the concrete pipe 1 has a frame shape that is the same as the shape of the end 1b of the concrete pipe 1, as shown in FIG. A recessed step 9 into which the flange piece 4 fits is formed at a position corresponding to 4, and a nut 10 is embedded in the recessed step 9 at a position facing the bolt insertion hole 5 of the flange piece 4. . On the other hand, the bottom part of the connector 3b has a connector 3a.
A dovetail-shaped recess 11 that fits into the protruding piece 6 is formed. Furthermore, a protrusion 12 is formed along the inner peripheral edge of the opening. The protrusion 12 has a tapered shape that becomes narrower toward the tip, and has a groove 14 carved into its outer circumferential surface into which the packing 13 is fitted. The protrusion 12 is connected to the inner peripheral wall of the opening of the connector 3a, and therefore the inner peripheral wall of the opening of the connector 3a is also formed in a tapered shape. Note that a flange 15 is formed on the opposite side of the connector 3b to the protrusion 12, and this has the same purpose as the flange 7 of the connector 3a.

The connectors 3a and 3b constructed as described above are integrally insert-molded at both ends 1a and 1b of the concrete pipe 1 by flanges 7 and 15, respectively.

During construction, the end 1a of one concrete pipe 1 is butted against the end 1b of another concrete pipe 1, and the protrusion 12 of the other connector 3b is inserted into the opening of the connector 3a. Fit together,
Furthermore, fit the flange piece 4 and protruding piece 6 of the connector 3a into the recessed step 9 and recess 11 of the other connector 3b, and insert the bolt 16 from the bolt insertion hole 5 of the flange piece 4 into the nut 10 of the connector 3b. Insert and tighten to secure.

[Effects of the invention] As explained above, according to the invention, the concrete pipes 1 can be joined by bolting, and the packing 13 is interposed between the connectors 3a and 3b, so that multiple The concrete pipes 1 can be joined easily and without any gaps, which has the effect of significantly shortening the construction period.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view of a concrete pipe, Fig. 2 is a perspective view of a connecting device 3a, Fig. 3 is a perspective view of a connecting device 3b, and Fig. 4 and 5 are perspective views of a connecting device 3b.
The figure is a front view of both ends of the concrete pipe, and FIG. 6 is a sectional view showing the joint part of the concrete pipe. 1... Concrete pipe, 2... Through hole, 3a,
3b... Connector, 4, 4... Flange piece, 5...
Bolt insertion hole, 6... protrusion, 10... nut, 1
1... recess, 12... protrusion, 13... padskin.

Claims (1)

[Scope of claim for utility model registration] A concrete pipe used when burying electric wires, etc. underground, which has a through hole formed inside a square column of unit length, and the following ( An underground concrete pipe into which electric wires, etc. are inserted, characterized in that a connector having the configurations of (a) to (c) is inserted therein. (a) Each connector has a rectangular frame shape that matches the shape of the end face of the concrete pipe, and one connector has a protruding flange piece on the side wall excluding the bottom that overlaps the outer periphery of the other connector. At the same time, a bolt insertion hole is bored in the flange piece, and a nut is embedded in the other connector at a position corresponding to the bolt insertion hole. (b) A projecting piece is provided on the bottom side of one connector, and a recess into which the projecting piece fits is formed on the bottom side of the other connector. (c) A protrusion is formed along the inner peripheral edge of the opening of one connector so that it fits into the inner peripheral wall of the opening of the other connector, and a packing is attached to the outer periphery of the protrusion to connect it to the protrusion. Bring the inner wall of the opening into close contact.