JPH0336590Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a safety fence for manhole openings during construction and inspection of underground power lines, sewers, etc.
The present invention further relates to a manhole safety fence that is easy to install and carry in detail.

<Conventional technology> Power transmission lines, sewerage systems, etc. are buried everywhere underground, and there are so-called manholes, which are entrances and exits that connect the above ground and the underground for construction and inspection of underground power lines, sewerage systems, etc. However, these manholes are located on the road to facilitate construction and inspection work.

When carrying out work such as construction or inspection at the manhole mentioned above, the manhole cover is opened, but in this case a hole is left on the road, so safety measures must be taken. However, as dust and stones can easily enter the manhole, and colored cones can be easily moved, there is a risk that pedestrians or automobile wheels may fall into the manhole. Ta.

<Problems to be solved by the invention> This invention solves the dangers that cannot be avoided with color cones, etc., which were conventionally used as a safety measure at manhole openings, and prevents easy intrusion from the outside. , provides a fence that is easy to install and transport.

<Means for Solving the Problems> The present invention solves the above-mentioned problems and is a fence that is easy to assemble and disassemble. Three pipes are removably connected to each other and formed into a cylindrical shape, and one of the three N-shaped pipes is used as a door that can be opened and closed, while the lower part has three arcuate plates connected to each other. The circular arc plates are connected and supported and formed into a cylindrical shape, and an adjusting part is provided on either boundary of the circular arc plate to adjust the diameter when connected, and the circular arc plate is further provided with a support part that supports the upper part. This manhole safety shelf is characterized in that a space is provided at the lower edge of each of the arcuate plates, through which a manhole cover connecting chain can be freely inserted.

<Examples> Hereinafter, a detailed description will be given with reference to illustrated embodiments of the present invention.

1 and 2 are perspective views of the manhole safety fence A of the present invention, respectively.

As shown in Figures 1 and 2, the manhole safety fence A includes an upper part 1 that connects three N-shaped pipes 1a, 1b, and 1c, and three circular arc plates 2a, 2.
It is composed of a lower part 2 consisting of parts b and 2c. Upper part 1
connects three N-shaped pipes 1a, 1b, 1c by a necessary means, and connects any one of them, for example 1a.
It is formed as a door part that can be opened and closed freely. In the central space of the N-shaped pipes 1a, 1b, 1c,
Protective nets 4a, 4b, and 4c, which can be opened and closed, are installed along predetermined guide frames 3, respectively. As a means for connecting the three N-shaped pipes 1a, 1b, and 1c, for example, an L-shaped hook is fixed to one side of the N-shaped pipes 1b and 1c, and a hollow tube is fixed to the other side. By installing them mutually, they can be detachably connected. In order to make the N-shaped pipe 1a openable and closable, one side is fixed with a hollow tube so as to fit the L-shaped hook of one of the other N-shaped pipes 1b and 1c, and the other side is attached to one of the other N-shaped pipes 1b and 1c. pipes 1b, 1c
All you have to do is fix the hollow tube so that it fits with the hollow tube, and attach a removable rod or the like. Although the above-mentioned means are used for each connecting portion, there are many other types and the present invention is not limited to these.

In addition, in the central space of the N-shaped pipes 1a, 1b, 1c, there are protective nets 4a, 4 that can be slid open and closed.
b, 4c, which are, for example, guide frames 3 fixed to the N-shaped pipes 1a, 1b, 1c, respectively.
When a ring 5 etc. is fitted loosely into the guide frame 3 and a protective net is attached thereto, it opens and closes laterally along the guide frame 3. There are many other types of opening/closing means and attachment means for these protection nets 4a, 4b, and 4c, and the present invention is not limited thereto.

Further, each of the pipes 1b and 1c, except for the N-shaped pipe 1a which opens and closes, is formed so that its lower end is inserted into a predetermined support pipe 6 of the lower part 2.

The lower part 2 is formed into a cylindrical shape by three arcuate plates 2a, 2b, and 2c, and its connecting means is the same as that of the upper part 1.
For example, an adjustment part 7 is provided using bolts and nuts etc. on the inner circumferential connection part of the arc plates 2a, 2b so that the diameter of the lower part 2 can be adjusted, and further, 2c are each provided with a space 8 of a required size. The adjustment portion 7 may be provided on the outer peripheral surface.

Although lightweight and rust-free aluminum is used as the material for the above-mentioned components, the present invention is not limited to this.

<Function> The present invention has the above-mentioned configuration. Next, the function will be described. First, the manhole safety fence A has the upper part 1.
The lower part 2 is also divided into three parts, and each N-shaped pipe 1a, 1b, 1c is connected by inserting a hollow pipe into a predetermined L-shaped hook, and the N-shaped pipe becomes the entrance and exit in the manhole safety fence A. Shape pipe 1
Only part a should be a door that can be opened and closed. Next, the arcuate plates 2a, 2b, and 2c are each assembled and fitted into the inside of the manhole B, and the lower part 2 is slightly expanded by the adjustment part 7 and fixed inside the manhole opening.
Furthermore, the upper part 1 is attached by fitting it into the support pipe 6 fixed to the lower part 2. The protective nets 4a, 4b, and 4c attached to the upper part 1 are normally closed, and when supplying oxygen to the manhole B, an air hose can be inserted therethrough.

Moreover, the spaces 8 provided in the lower part 2
Since the cover of manhole B is usually connected to a chain or the like, it was installed so that it could be passed through from there.

In this example, the manhole safety fence A was baked with melamine resin, and at night it was wrapped with reflective tape that reflects car lights, etc., to ensure complete security.

<Effects> As described above, according to the present invention, the safety fence for manholes has an upper part formed by a 3-part pipe and a lower part by a 3-part arc plate, so there is no danger of children or cars easily falling into it. Since the lower part is raised a predetermined length from the ground, the intrusion of stones and dust can be prevented, and it has many effects such as being easy to assemble and disassemble, and easy to install and carry.

[Brief explanation of the drawing]

1 and 2 are perspective views of the present invention. In the figure, A: Manhole safety fence, B: Manhole, 1: Upper part, 1a, 1b, 1c: N-shaped pipe, 2: Lower part, 2a, 2b, 2c: Arc plate, 3:
Guide frame, 4a, 4b, 4c: protection net, 5: ring, 6: support pipe, 7: adjustment section, 8: space section.

Claims (1)

[Scope of utility model registration request] At the top, three N-shaped pipes each with a protective net that can be opened and closed are removably connected to each other to form a cylindrical shape, and one of the three N-shaped pipes has a door that can be opened and closed. department,
On the other hand, in the lower part, three arcuate plates are connected and pivoted to each other to form a cylindrical shape, and an adjustment part is provided at the border from which of the arcuate plates, the diameter of which can be adjusted when connected. A safety shelf for a manhole, characterized in that a support part for supporting the upper part is installed on the plate, and a space part is bored in the lower edge of each of the arcuate plates, into which a chain for connecting a manhole cover can be freely inserted.