JPS5918832Y2 - Prefabricated duct block for manhole - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a prefabricated duct block for fixing a conduit in a manhole for passing cables such as covered insulated electric wires and telephone lines underground.

Conventionally, conduit connections for underground installations of electric wires, telephone lines, etc. have been made through manholes, but the current method of constructing manholes for communication cables is assembling a formwork at the installation site and installing it inside the manhole. Two methods are known: an on-site pouring method in which reinforcing steel, cement concrete, etc. are filled, and a method in which resin concrete prefabricated masonry holes are molded in advance on the ground in sections and then assembled on-site.

However, in the above-mentioned conventional communication cable manhole installation work, in both construction methods, the manhole wall portion corresponding to the duct opening of the conduit inserted underground is made hollow in advance, and after the manhole is installed, the manhole wall portion corresponding to the duct opening of the conduit inserted underground is Work was being carried out to connect and fix the pipeline to the duct entrance in the hollow area.

In other words, when fixing the connection between the pipe and the manhole, from the viewpoint of preventing damage caused by the cable laid inside the pipe being bent and abutting the end of the pipe at the duct mouth end of the pipe. This construction method involves installing a trumpet-shaped duct socket in advance, aligning the end face of the duct socket with the inner wall surface of the manhole, and then pouring cement concrete into the hollow space and shaping and hardening it while filling. As the number increases, there are many problems such as the construction becoming complicated and difficult.

The present invention focuses on the current situation and the fact that the mutual spacing of each conduit, the positional relationship with the hollow part of the manhole, and the conduit dimensions are standardized at the end of the duct mouth of the conduit, By combining and stacking several types of pre-manufactured standard blocks at the factory to connect sections and fix pipes, we simplify the construction method and improve work efficiency, making it possible to carry out on-site construction. It is an object of the present invention to provide a prefabricated duct block for manholes that can greatly reduce the number of days required.

An embodiment of the present invention will be described below with reference to the drawings. The prefabricated duct block for manholes according to the present invention is an L-shaped duct made of resin concrete, synthetic resin acid, hard rubber, etc. It is composed of a block 1, a T-shaped duct block 6, and a green duct block 10. In the figure, MH indicates a manhole, and mh corresponds to the duct opening end face k of the conduit provided in this manhole MH. A rectangular hollow hole is shown.

2 is a groove bored in the L-shaped duct block 1, and this groove 2 is formed in an H-circle shape that matches the diameter of the pipe line;
indicates a trumpet-shaped inclined surface formed at one end of the groove 2.

4 and 4' are outer peripheral flat parts 1a and 1 of the L-shaped duct block 1.
The recesses for preventing displacement formed in FIG.

In addition, the outer circumferential flat portions 1a, lb of this L-shaped duct block 1,
Load sealing material into IC and ld and install L-shaped duct block 1.
The strength of the material can be reinforced.

Reference numerals 7 and 7' indicate grooves bored in the T-shaped duct block 1. Each of these grooves 7 and 7' is formed into an H-circle shape that matches the diameter of the pipe, and 8 and 8' indicate grooves. The trumpet-shaped inclined surfaces formed at one ends of 7 and 7' are shown, respectively.

Reference numeral 9 indicates a recess formed in the plane portion 7a of the T-shaped duct block 6 to prevent displacement.

Incidentally, the outer circumferential flat portions 7a, 7 of this T-shaped duct block 6
b, 7C.

7d can be loaded with a sealing material to reinforce the strength of the T-shaped duct block 6.

11, 11', 11'', 11'' are grooves bored in the green duct block 10, and these grooves 11.1
1', 11''.

11'' are each formed in an H-circle shape that matches the diameter of the pipe, and 12.12', 12'', and 12'' are grooves 11.1.
1', 11".

A trumpet-shaped inclined surface formed at one end of 11' is shown.

Incidentally, the outer circumferential flat part 10 a of this green duct block 10
, 10b, 10C, and 10d may be filled with a sealing material to reinforce the strength of the green duct block 10.

Next, the above-mentioned type duct block 1, T-type duct block 6, and green type duct block 10 according to the present invention are applied to the manhole MH and the duct opening of the pipe when the pipe K has nine pipes. To explain the case of coupling and fixing based on FIG. 3, the rectangular hollow hole m of the manhole MH
H is divided into 16 blocks, 4 in length and width, and an L-shaped duct block 1 is placed at each corner of the rectangle, and a T-shaped duct block 1 is placed in the blocks between the L-shaped duct blocks 1 corresponding to the sides of the rectangle. The duct block 6 is one of the L-type and T-type duct blocks.
Green duct blocks 10 are stacked one after another on the four blocks surrounded by and 6 through backings or by gluing them together as shown in Figure 3.

Recesses 4, 4' and 9 are bored in the outer circumferential flat parts of the double-shaped duct block 1 and the T-shaped duct block 6, that is, the flat parts 1a, 1b, and 7a facing the side of the hollow hole mh of the manhole MH. Since the recesses 4, 4' and 9 are cut out, there is no risk of each duct block being displaced through the recesses 4, 4' and 9.

As described above, the present invention provides two routes of L-shaped duct blocks, T-shaped duct blocks, and green duct blocks in the hollow holes of a manhole that corresponds to the number of pipes laid underground. Since the ducts can be combined and stacked sequentially in correspondence with the ends of the ducts, it is possible to improve work efficiency and simplify the construction method, as well as to significantly shorten the number of construction days on site. Since the various duct blocks related to the invention have standardized pipe diameters, they can be mass-produced in advance at factories, reducing construction costs. One end has a trumpet-shaped inclined surface that extends, so there are many benefits such as making it possible to perform bending work on site without damaging cables, etc. without the need for a duct socket like in the past. It has a certain effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of a manhole for telecommunications made of resin concrete;
Figures 2A, B, and C are perspective views of a hole-type duct block, a T-type duct block, and a raw type duct block, respectively; Figure 3 is an assembly explanatory diagram for a case where there are nine pipes; Figure I-
It is an I line sectional view. 1...L-shaped duct block, 6...T-shaped duct block, 10...green duct block, MH...manhole, mh...hollow hole, K...pipeline, k.・・・
Duct opening end.

Claims (1)

[Scope of utility model registration request] Drill one circular groove in the rectangular parallelepiped to match the diameter of the pipe,
An L-shaped duct block is formed by forming one end of this groove into a trumpet shape, and two H-shaped circular grooves that match the diameter of the pipe are bored in the rectangular parallelepiped, and one end of each of these grooves is formed into a trumpet shape. A T-shaped duct block is formed by forming a T-shaped duct block, and a green duct block is formed by drilling four circular grooves in a rectangular parallelepiped to match the diameter of the pipe, and forming one end of each of these grooves into a trumpet shape. , a prefabricated duct block for manholes.