JPH0860737A - Protective fence for manhole - Google Patents

Abstract

PURPOSE: To ensure the safety of a work by injecting a fluid into a ring-like bag which is moored at the inner wall of a manhole normally in its contracted state to be expanded at the time of a manhole work, thereby surrounding the opening part of the manhole. CONSTITUTION: At the time of a work in a manhole 3, a ring-like bag 6 which is stored in its contracted state in the manhole 3 is taken out from the opening part 4 of the manhole onto the road surface 5, and a fluid such as air, water or the like is injected into the bag. Whereupon, the ring-like bag 6 is expanded in such a manner as to have a height required for protection and such an inside diameter as to enclose the manhole opening part 4, kept in shape like a fence, and placed in such a manner as to enclose the opening part 4. At this time, an entrance 11 for permitting a worker to go in and out is formed on a part of the side wall. Subsequently, after the end of the manhole 3 work, the fluid in the bag 6 is discharged to contract the bag, and the bag is moored at the inner wall of the manhole 3 through a fitting member 8 having a bending part comprising plural hinges 10,10 having a pivot in the horizontal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole guard fence which is installed on a road surface around a manhole opening for safety in various operations in a manhole.

[0002]

2. Description of the Related Art As a manhole protective fence, a plurality of iron rectangular protective fences arranged so as to surround a manhole opening are conventionally used.

However, the above-mentioned conventional protective fence has a problem that after installation, it is liable to cause injury accidents due to contact with pedestrians, bicycles, etc., and it is necessary to carry in and out at the start and end of manhole work. .

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to be relatively safe even when a pedestrian or the like is brought into contact with it, and to prevent injury accidents. Moreover, there is no need to carry in and out when starting and ending manhole work. The purpose of the present invention is to provide a protective fence for manholes that can be easily made ready for use at the start of.

[0005]

A manhole guard fence according to the present invention is expanded so as to have a height required for protection by injecting a fluid and an inner diameter capable of surrounding a manhole opening, and an entrance / exit in a part of a side wall. And an annular bag body that is contracted so that it can be stored in the manhole when the fluid is discharged,
And a mounting member which is moored to the inner wall of the manhole via a bendable portion so that the annular bag can be put in and out of the manhole when it is contracted and can be placed on the road surface around the manhole opening when it is expanded. .

It is preferable that the annular bag is kept in a circular shape when expanded, from the viewpoint of manufacturing and structure, but it may have an elliptical shape or a polygonal shape if necessary. .

The inlet / outlet of the annular bag body may be provided by, for example, notching the side wall in a concave shape from the upper edge or the like, or penetrating a hole.
A door that can be opened and closed is provided to prevent entry by persons other than those involved, or ropes and other ropes that can be undocked are stretched in the width direction. As the structure of the door, for example,
A plate-like bag body that communicates with the annular bag body may be extended via a hinge mechanism or the like so that the entrance and exit can be opened and closed.

The mounting member may include a bendable portion formed of a plurality of hinges having a horizontal axis, for example, and may include a bendable portion formed of a columnar bag communicating with the annular bag. As the flexible structure other than the above, for example, a swivel joint, a universal joint, a flexible tube, a chain, ropes, or the like can be used. The above-mentioned hinges and other bendable structures are made into required bendable portions alone or by combining the same kind or different kinds with each other as necessary.

In the above structure, it is preferable that the plurality of mounting members are arranged at positions separated from each other by a required angle with respect to the central axes of the manhole and the annular bag body, particularly at positions separated by an equal angle, and three or more. The mounting members are arranged at positions which are separated from each other by a required angle with respect to the central axes of the manhole and the annular bag, and particularly at positions which are evenly spaced apart from each other, and inside the annular bag when the annular bag is expanded between adjacent mounting members. The reinforcing bar may be installed at a required height. The reinforcing bar may be detachably engaged with, for example, a joint member provided in advance on each mounting member.

[0010]

In the above structure, the annular bag is anchored to the inner wall of the manhole via the mounting member by an anchor, an adhesive, a screw or other engaging member, and is normally housed in the manhole in a contracted state. The mooring position of the annular bag body is preferably the inner wall of the mannequin inner wall of the concrete skeleton portion below the iron receiving frame, in view of the ease of fixing.

During manhole work, the annular bag that is housed in the manhole in a contracted state is taken out from the manhole opening onto the road surface and a fluid such as air or water is injected into the manhole, so that the height required for protection and the manhole are reduced. It is expanded so as to have an inner diameter capable of surrounding the opening, and is retained in a required fence shape while maintaining elasticity, and placed on the road surface while surrounding the manhole opening. In the expanded state, the annular bag on the road surface does not easily enter the manhole because the inner diameter is larger than the manhole opening.

Along with the expansion of the annular bag body, a doorway of a size that allows a worker to come in and out is formed in a part of a side wall of the bag body.

Upon completion of the manhole work, the fluid is discharged from the expanded annular bag body in the entire amount or a required amount and is contracted, and is housed in the manhole together with the mounting member. Incidentally, in order to maintain the annular bag body at a required height in the manhole at the time of storing the annular bag body, an appropriate amount of fluid is injected into the annular bag body to hold it in pressure contact with the inner wall of the manhole. It can be expanded.

The attachment member follows the above-described operation of the annular bag body associated with taking in and out of the manhole, expansion and contraction, and the like while appropriately bending at its bendable portion. In addition,
When the annular bag is placed around the manhole opening on the road surface in the expanded state, the bendable part of the mounting member is temporarily unchangeable with a stopper or the like in order to stabilize the state. You may fix it.

In the case where the annular bag is provided with a plate-like bag which communicates with the annular bag so as to open and close the entrance and exit, the entrance and exit can be opened and closed by the expanded plate-like bag when the annular bag is expanded.

In the case where the mounting member has a bendable portion composed of a plurality of hinges having a horizontal axis, the mounting member can be bent inward and outward in a vertical plane. Further, in the case where the mounting member has a flexible portion formed of a columnar bag body communicating with the annular bag body, it is particularly bendable when the columnar bag body is contracted, and at the same time when the annular bag body is expanded by injecting a fluid. The columnar bag is also expanded.

Further, in the case where the plurality of mounting members are arranged at positions separated from each other by a required angle with respect to the respective central axes of the manhole and the annular bag, the annular bag is housed in the manhole and on the road surface. When the opening is surrounded, it is anchored to the inner wall of the manhole at a plurality of places through each mounting member. Further, three or more mounting members are arranged at positions separated from each other by a required angle with respect to the respective central axes of the manhole and the annular bag body, and a reinforcing bar is provided inside the annular bag body between adjacent mounting members when the annular bag body is expanded. When installed at the required height, the reinforcing bar suppresses unnecessary movement of the annular bag body and forms an auxiliary fence inside to reinforce the annular bag body, and also for supporting manhole workers. Form handrails. In order to more stably install the reinforcing bar, it is preferable to select a hard mounting member that is stably arranged on the road surface when the annular bag body is expanded.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of an essential part of a manhole protective fence according to an embodiment of the present invention, and FIG. 2 is a plan view of an essential part of the manhole protective fence shown in FIG.

In the figure, a cylindrical concrete skeleton 1
The iron receiving frame 2 is installed via the height adjusting member and the manhole 3 is formed. In the drawing, the iron lid of the receiving frame 2 is removed and the manhole opening 4 is exposed on the road surface 5. .

Further, the circular rubber annular bag body 6 is provided with a fluid supply / discharge port 7 on the outer peripheral portion thereof, and the bottom portions of the annular bag body 6 are 90 degrees apart from each other.
Anchors 9 are fixed to the inner wall of the concrete skeleton 1 via steel attachment members 8 at four positions spaced apart from each other. Each mounting member 8 is provided with a hinge 10 having horizontal pivots at two places, and these are flexible portions. The annular bag body 6 is provided with a rectangular entrance / exit 11 by a concave cutout from the upper edge thereof, and a plate-like bag body 12 which is connected to the annular bag body 6 in the circumferential direction is provided so that the entrance / exit opening 11 can be opened and closed. The mounting portion 13 of the plate-shaped bag body 12 is formed as a hinge so as to be thinner than the side wall of the annular bag body 6 and the plate-shaped bag body 12 in order to facilitate opening and closing. A hook device for engaging and disengaging the plate-like bag body 12 at the entrance / exit 11 with the opposing end of the swing-side end of the plate-like bag body 12 and the annular bag body 6 at the entrance / exit 11 is prevented. 14 is provided. Further, a pair of cylindrical insertion ports 15 are provided on each mounting member 8 so as to be adjacent to the inner circumference of the annular bag body 6.

At the start of manhole work, the annular bag body 6 is taken out of the manhole 3 in a contracted state,
Inlet / outlet 1 by injecting fluid such as air from fluid supply / discharge port 7
1 is expanded together with the plate-like bag body 12 in FIG. 1 and has a height required for protection and an inner diameter capable of surrounding the manhole opening 4 as shown by the solid line in FIG. 1, and is placed around the manhole opening 4 on the road surface 5. It Each mounting member 8 is an annular bag body 6.
In accordance with the above-mentioned removal of the above, etc., each hinge 10 is appropriately bent outward so that it can follow it, and the corresponding insertion ports 1 of the adjoining attachment members 8 as required.
Each leg of the horizontal U-shaped reinforcing bar 16 is removably inserted between the five, and the state becomes usable as a protective fence.

Next, at the end of the manhole work, each reinforcing bar 16 is removed, and the annular bag body 6 in the expanded state is contracted together with the plate-like bag body 12 by discharging the fluid from the fluid supply / discharge port 7. As shown by the alternate long and short dash line in FIG. 1, the manhole 3 is appropriately folded and taken into the manhole 3 and stored as well as necessary. Each mounting member 8 is an annular bag body 6.
The hinges 10 are bent inward so that they can follow the above-mentioned intake and removal. In order to easily take out the annular bag body 6 housed in the manhole 3 as described above, a string or other pulling member is connected to the annular bag body 6 and each mounting member 8 so as to be easily taken out. It may be extended upward.

FIG. 3 is a longitudinal half sectional view of a main part of a manhole protective fence according to another embodiment of the present invention. In the figure, instead of the one having the hinge 10 as each mounting member 8, one having a bendable portion formed of an L-shaped columnar bag body 17 communicating with the annular bag body 6 is used. When the annular bag body 6 is contracted, the columnar bag body 17 is also in a contracted state, and due to the flexibility thereof, the annular bag body 6 can be flexibly bent to follow the withdrawal of the annular bag body 6 with respect to the manhole 3, and the annular bag body on the road surface 5. When expanding 6, the columnar bag 17 is also expanded to elastically support the expanded annular bag 6.

[0024]

EFFECT OF THE INVENTION The manhole protection fence according to the present invention is constructed as described above, and since the expanded annular bag body has elasticity and shock absorption, it is relatively safe and injured even when contacted by a pedestrian or the like. Accidents are unlikely to occur, and since the annular bag is always moored to the inner wall of the manhole, loading and unloading are not required at the start and end of the manhole work, and the manhole work can be easily made ready for use at the start.

In a case where a plate-shaped bag body which communicates with the annular bag body is extended so as to be able to open and close the entrance and exit, when the annular bag body is expanded, the entrance and exit can be opened and closed by the expanded plate-like bag body,
At the time of closing, elasticity and impact absorption can be imparted to the entrance and exit as well as the side wall.

In the case where the mounting member is provided with a bendable portion composed of a plurality of hinges having a horizontal axis, the mounting member can be bent inward and outward in the vertical plane, and the annular bag body in a contracted state can be formed. It is possible to easily put in and take out the manhole. Further, in the case where the mounting member has a flexible portion formed of a columnar bag body that communicates with the annular bag body, the columnar bag body can be bent when the columnar bag body is contracted, and the columnar bag body is expanded at the same time when the annular bag body is expanded by injecting fluid. The body is also expanded and, in its expanded state, the annular bag is held relatively stable on the road surface by the similarly expanded columnar bag.

Further, in the case where the plurality of mounting members are arranged at positions separated from each other by a required angle with respect to the respective central axes of the manhole and the annular bag, the annular bag is housed in the manhole and on the road surface. When the opening is surrounded, the manhole is moored to the inner wall of the manhole at a plurality of places through the respective mounting members and is more stably held on the road surface. Also,
Three or more attachment members are arranged at positions separated from each other by a required angle with respect to the central axes of the manhole and the annular bag body, and a reinforcing bar is required inside the annular bag body between adjacent attachment members when the annular bag body is expanded. When installed at a height, the reinforcing bar suppresses unnecessary movement of the annular bag body and forms an auxiliary fence inside to reinforce the annular bag body, and also supports handrails for manhole workers, etc. To strengthen the protective action and contribute to the safety of manhole work.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a manhole protective fence according to an embodiment of the present invention.

FIG. 2 is a plan view of an essential part of the manhole protection fence shown in FIG.

FIG. 3 is a longitudinal half sectional view of a main part of a manhole protective fence according to another embodiment of the present invention.

[Explanation of symbols]

 3 Manhole 4 Manhole opening 5 Road surface 6 Ring bag 8 Mounting member 10 Hinge 11 Doorway

Claims (6)

[Claims] 1. A fluid is injected so as to have a height required for protection and an inner diameter capable of enclosing a manhole opening, and an inlet / outlet is formed in a part of a side wall so that the fluid can be stored in the manhole. An annular bag body to be contracted, and the annular bag body is anchored to the inner wall of the manhole via a bendable portion so that the annular bag body can be put in and out of the manhole when it is contracted and can be placed on the road surface around the manhole opening part when it is expanded. Protective fence for manhole consisting of mounting members. 2. The manhole protective fence according to claim 1, wherein a plate-shaped bag body communicating with the annular bag body is provided so as to be capable of opening and closing the entrance. 3. The protective fence for a manhole according to claim 1, wherein the mounting member includes a bendable portion composed of a plurality of hinges having a pivot in a horizontal direction. 4. The manhole protective fence according to claim 1, wherein the attachment member includes a bendable portion formed of a columnar bag body communicating with the annular bag body. 5. The manhole protective fence according to claim 1, 3 or 4, wherein the plurality of mounting members are arranged at positions separated from each other by a required angle with respect to the central axes of the manhole and the annular bag. 6. Three or more mounting members are arranged at positions separated from each other by a required angle with respect to the respective central axes of the manhole and the annular bag body, and between the adjacent mounting members inside the annular bag body when the annular bag body is expanded. The manhole protective fence according to claim 1, 3 or 4, wherein the reinforcing bar is installed at a required height.