JP2023122407A - Protection fence for manhole - Google Patents

Abstract

To provide a protection fence for a manhole for preventing falling accident of a pedestrian or an article into a manhole opening in work time in a manhole inside.SOLUTION: A protection fence comprises a rectangular front frame and a rear frame each having two connected columns, and connection means set between one side columns and the other side columns of the front frame and the rear frame and constituted expandably and shrinkably in a prescribed distance range. By expanding the connection means, a square cylindrical rectangular space is formed, and by shrinking the connection means, the protection fence can be folded.SELECTED DRAWING: Figure 1

Description

In order to prevent accidents such as pedestrians and articles falling into the manhole opening during work inside the manhole, the present invention is to surround the manhole opening to prevent such falling accidents. It relates to protective fences for manholes.

2. Description of the Related Art Conventionally, manholes are installed on roads for maintenance and inspection work of facilities such as electric wires, gas pipes, water supply and sewage pipes, etc., which are buried underground. Most manholes serve as inspection openings for various facilities buried underground, and workers enter the manholes to perform maintenance and inspection work.

While workers are performing maintenance and inspection work on various facilities inside the manhole, the manhole cover is opened and the manhole opening is open, so be careful not to let pedestrians or items fall into the manhole. need to be awakened.

Therefore, for the purpose of ensuring the safety of workers and pedestrians, there is a fall prevention tool that reliably surrounds the opening of a manhole with a fence or board and has good installation stability. This facilitates entry and exit of workers, prevents people and articles from falling into the manhole, and enables compact storage after use. (See Patent Document 1).

Japanese Patent No. 6309671

The manhole protection fence shown in Patent Document 1 can be folded and compactly stored when not in use (when stored), but when in use, an outer frame is attached to three sides except for the entrance in order to form four sides of a virtual rectangular cylindrical body. A complicated assembly work is required for fitting and forming an entrance consisting of a door frame and a door body on the remaining one side. Furthermore, in order to prevent articles from falling into the manhole, the lower part of the outer frame on the three sides is installed so as to be covered with elastic members. There is fear.

In addition, the outer frame on three sides that form the four sides of the virtual square cylinder and the door on one side are formed in a square square shape when viewed from the front by lattice members, so the opening is large and ventilation is good. However, the inside of the manhole protection fence is fully visible from the outside and lacks shielding properties. Furthermore, a wide square-shaped opening is not suitable for preventing entry of articles, even if it can prevent entry of people from the outside.

Furthermore, in order to give various functions to the protective fence installed at the manhole opening, there is a transport means for carrying heavy objects from the outside into the manhole inside the manhole protective fence and a ladder that runs vertically in the vertical hole just below the manhole opening. Auxiliary means for workers is provided to allow workers to enter and exit the manhole safely by hanging the manhole, but it is simple because it has a complicated structure in addition to the function of surrounding the manhole opening. A highly functional protective fence for manholes having various functions is desired.

In order to solve this problem, in the present invention, by reducing the number of parts as much as possible, it is possible to make it compact in the stored state, and it is easy to install around the manhole opening in the used state, and it is easy to work. To provide a protective fence for manholes capable of improving the workability and safety of workers.

In order to solve the above-mentioned problems, the present invention provides a rectangular front frame and a rear frame having two struts connected to each other, and connecting means for connecting the front frame and the rear frame so as to be telescopic within a certain range. A square frame space is formed above the manhole opening by connecting the front frame and the rear frame with the connecting means, and the front frame and the rear frame can be folded by contracting the connecting means. The protective fence for manholes is characterized by:

In addition, the connecting means is also characterized by being a telescopic fence using a pantograph mechanism.

Also, a rail rotatably provided on the upper part of the rear frame, a trolley provided on the rail, and a rail connecting fitting provided on the front frame and the rail so that the rail can be installed between the front frame and the rear frame. , and is characterized in that it is possible to transport articles between the outside and the inside of the square frame space by means of a trolley.

At least one of the front frame and the rear frame is provided with an auxiliary means for assisting workers to enter and exit the manhole. It is also characterized by comprising a ladder connecting fitting that is movably connected and supported in the use state and the stored state with respect to at least one of the above.

In the present invention, by providing a connecting means that can be expanded and contracted within a certain distance range, it is possible to easily form a square frame space in which workers can work with peace of mind. It is possible to save space when moving or storing by folding.

According to the second aspect of the invention, by using the pantograph mechanism as the connecting means, the connecting means can be expanded and contracted more easily, and the device can be made more compact when contracted.
In addition, by using the pantograph mechanism as the connection means, the width of the square frame space can be easily changed according to the extension width.

According to the invention of claim 3, by providing a conveying means having a rail and a trolley, a worker who is working in the rectangular frame space and a worker who is working outside the protective fence for manholes It is possible to facilitate carrying in and out of articles between.
In addition, by rotatably providing the rails that constitute the transport means, the rails can be hung from the rear frame perpendicularly to the ground so as not to hinder the compact storage of the manhole protective fence. can be

According to the invention according to claim 4, by providing auxiliary means for connecting the ladder to at least one of the front frame and the rear frame by a ladder connecting fitting that is movably connected and supported between the use state and the storage state, When the ladder is in use, it can be installed on the ground near the manhole opening to assist workers in entering and exiting the manhole. It can be stored inside the manhole protection fence so that it does not interfere when the manhole protection fence is put in the stored state.

It is a perspective view which shows the installation state of the protection fence for manholes which concerns on one Embodiment of this invention. It is a perspective view which shows the installation state of the protection fence for manholes which concerns on one Embodiment of this invention. It is a figure explaining the auxiliary means of the protection fence for manholes which concerns on one Embodiment of this invention. It is a figure explaining the connection means of the protection fence for manholes which concerns on one Embodiment of this invention. It is a figure explaining the conveyance means of the protection fence for manholes which concerns on one Embodiment of this invention. It is a figure explaining the shielding means of the protective fence for manholes which concerns on one Embodiment of this invention.

The gist of the present invention consists of a square-shaped front frame and a rear frame having two struts connected to each other, and connecting means for connecting the front frame and the rear frame so as to extend and contract within a certain range. A square frame space is formed above a manhole opening by connecting the frame and the rear frame with a connecting means, and the front and rear frames can be folded by contracting the connecting means.

In addition, the connecting means is also characterized by being a telescopic fence using a pantograph mechanism.

Also, a rail rotatably provided on the upper part of the rear frame, a trolley provided on the rail, and a rail connecting fitting provided on the front frame and the rail so that the rail can be installed between the front frame and the rear frame. , and is characterized in that it is possible to transport articles between the outside and the inside of the square frame space by means of a trolley.

At least one of the front frame and the rear frame is provided with an auxiliary means for assisting workers to enter and exit the manhole. It is also characterized by comprising a ladder connecting fitting that is movably connected and supported in the use state and the stored state with respect to at least one of the above.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an installed state of a manhole protection fence according to this embodiment. FIG. 2 is a perspective view showing the installation state of the manhole protection fence according to the present embodiment and the state in which the shielding means is attached. FIG. 3 is a diagram for explaining the connection means of the protective fence for manholes according to the present embodiment. 4A and 4B are diagrams for explaining the conveying means for the protective fence for manholes according to the present embodiment. FIG. 5 is a diagram for explaining auxiliary means of the manhole protection fence according to the present embodiment. FIG. 6 is a diagram for explaining the shielding means of the protective fence for manholes according to this embodiment.

The manhole protective fence M according to the present invention covers the upper part of the manhole opening H in order to prevent accidents in which pedestrians and articles fall into the manhole opening H when working inside the manhole. It is possible to provide a square frame space S in which the

As shown in FIGS. 1 and 2, the manhole protection fence M according to this embodiment includes a square front frame 100 having two front struts 110 connected mainly to each other, and It is composed of a rectangular rear frame 200 having two connected rear struts 210, and a connecting means 500 which interposes the front frame 100 and the rear frame 200 and which is extendable.

The front frame 100 is formed in a rectangular shape by two front horizontal beams 120 installed on two front struts 110 erected perpendicularly to the ground G. As shown in FIG.
The front strut 110 is composed of a right front strut 111 and a left front strut 112 which stand on the left and right at predetermined intervals.
The front horizontal beam 120 is composed of an upper front horizontal beam 121 constructed near the upper ends of the two front pillars 110 and a lower front horizontal beam 122 constructed near the lower ends of the two front pillars 110. - 特許庁
In this embodiment, the front struts 110 and the front horizontal beams 120 are illustrated as bar members with a circular cross section, but the shape is not limited to this and may be any shape such as a pipe member or a square cross section. good too.

A front frame reinforcing member 130 for increasing the strength of the front frame 100 is provided on the front strut 110 and the front horizontal rail 120 . Specifically, the plate members are obliquely welded to the four corners of the front frame 100 .
The front frame reinforcing member 130 is not limited to a plate-like member, and may have any shape as long as it is obliquely welded to the four corners of the front frame 100 .

A door 140 for entering and exiting the square frame space S is provided in the lower half portion of the front frame 100 .
The door 140 is composed of a rectangular door frame 141 and a hinge fitting 142 that rotatably supports the door frame 141 on the front post 110 . In this embodiment, a hinge metal fitting 142 is provided on the front left support column 112 so that the door frame 141 can be rotated to the outside of the protective fence M for manholes.

The rear frame 200 is formed in a square shape by three rear horizontal beams 220 installed on two rear struts 210 erected perpendicularly to the ground G. As shown in FIG.
The rear strut 210 is composed of a right rear strut 211 and a left rear strut 212 erected at a predetermined interval on the left and right.
The rear horizontal beam 220 consists of an upper rear horizontal beam 221 constructed near the upper ends of the two rear struts 210 and a middle rear horizontal beam 222 constructed at a position substantially dividing the two rear horizontal beams 210 into two. It is composed of a lower rear horizontal beam 223 constructed near the lower end of the rear strut 210 .
In this embodiment, the rear struts 210 and the rear horizontal beams 220 are illustrated as bar members having a circular cross section, but the shape is not limited to this, and may be any shape such as a pipe member or a square cross section. good too.

A front frame receiver 240 is provided on the upper part of the rear strut 210 to hold the front strut 110 in a stowed state, which will be described later.
The front frame receiving body 240 includes a bracket 241 protruding toward the front frame 100 from the upper portion of the rear strut 210, and a substantially U-shaped receiving portion 242 attached at the tip of the bracket 241 with the notched portion directed toward the front frame 100. Consists of
When the manhole protection fence M is put in the retracted state, the upper part of the front strut 110 can be held by the substantially U-shaped receiving part 242 .

In this embodiment, the front frame receiver 240 is provided on the rear support 210 in order to hold the front support 110 in the stored state, but it is not necessarily provided on the rear support 210. It may also be shaped to receive the post 210 .

As shown in FIG. 3, the rear frame 200 is provided with an auxiliary means 250 for assisting workers in entering and exiting the manhole.
The auxiliary means 250 consists of two ladder supporting posts 251 provided between the middle rear horizontal beam 222 and the lower rear horizontal beam 223, and a ladder 252 connected to and supported by the ladder supporting beams 251 by means of ladder connecting fittings 253. .

The ladder connecting fitting 253 is a thin plate-like member, and has one end pivotally supported by the ladder support column 251 and the other end pivotally supported by the ladder 252 . Therefore, when the ladder 252 is not used, it can be stored within the frame of the rear frame 200 and inside the thickness of the rear strut 210, as shown in FIG. 3(a). When the ladder 252 is used, the ladder 252 can be extended from the rear frame 200 and installed on the ground G by rotating the ladder connecting fitting 253, as shown in FIG. 3(b).

By the way, a climbing ladder L as shown in FIG. 1 is often provided inside the manhole. However, since it is provided below the manhole opening H, that is, at a position lower than the ground G, there is no clue when entering or escaping from the inside of the manhole, and the worker lies on his stomach. There was a problem with safety because it was difficult to hold on to going in and out.
Therefore, by providing the manhole protection fence M with the auxiliary means 250, when using the ladder 252, the ladder 252 is installed on the ground G near the manhole opening H, and the worker can maintain an upright posture when entering and exiting the manhole. 252 can be used as a clue to safely work.

The front frame 100 and the rear frame 200 described above are provided with casters 300 for movement and stabilizers 400 for restricting movement and allowing the machine to rest at the installation location.

The casters 300 are provided at the lower ends of the front struts 110 and the rear struts 210, respectively, to facilitate movement of the manhole protective fence M. As shown in FIG.
Also, the caster 300 is provided with a brake 310 for restricting the movement of the caster 300 .

The caster 300 may be of any type as long as it can move the protective fence M for manholes, but it is preferable to use a free caster that can move forward, backward, left and right.

The stabilizer 400 is provided below the lower front horizontal beam 122 and the lower rear horizontal beam 223 and comprises a cylindrical body 410 having a spiral groove therein and a fixing bolt 420 screwed into the internal groove of the cylindrical body 410 .
The lower end of the fixing bolt 420 has a seat portion to widen the contact area with the ground G. As shown in FIG.

The stabilizer 400 is provided to further stabilize the manhole protection fence M on the ground G after the manhole protection fence M is carried to a predetermined position by the casters 300 and installed.
That is, when the protective fence M for manholes M is moved, the fixing bolt 420 is rotated in one direction so as to float from the ground G. By bringing the part into contact with the ground G, the movement can be regulated and the installation state can be stabilized.

The front frame 100 and the rear frame 200 are integrally connected by connecting means 500 as shown in FIGS.
The connecting means 500 includes a telescopic fence 510 using a so-called pantograph mechanism, in which a plurality of rod-shaped members 511 are rotatably formed in a diamond shape, and a fence connecting fitting 520 for connecting to the front strut 110 and the rear strut 210. consists of

The telescopic fence 510 is telescopic by using a pantograph mechanism. Therefore, by extending the telescopic fence 510, the square frame space S can be formed between the front frame 100 and the rear frame 200, so that it can be used. On the contrary, by contracting the telescopic fence 510, the front frame 100 and the rear frame 200 can be brought closer to each other, so that the manhole protection fence M can be compactly folded and stored.

The fence connection fitting 520 is provided on the front strut 110 and the rear strut 210 and consists of a sliding support portion 521 having an elongated hole and a rotation support portion 522 that pivotally supports the rod-shaped member 511 .

The sliding support portion 521 is formed in a substantially rectangular thin plate shape and is provided integrally with the front strut 110 on the rear frame 200 side and the rear strut 210 on the front frame 100 side at one end in the longitudinal direction. A long hole is formed in the longitudinal direction of the sliding support portion 521 . When the pantograph mechanism performs an expansion/contraction operation, the connecting portions of the rod-shaped members 511 rotate and move up and down. , so as not to hinder the expansion and contraction movement.

The rotation support part 522 is configured to have a substantially rectangular thin plate shape and pivotally support the telescopic fence 510 at substantially the center.

That is, when the telescopic fence 510 is telescopically moved, the fence connecting metal fittings 520 pivotally support one part of the left and right ends of the telescopic fence 510 on the rotation support part 522, and pivotally support other parts of the left and right ends of the telescopic fence 510. The pantograph mechanism can be extended or contracted by vertically sliding while pressing.

The connection means 500 is configured by the telescopic fence 510 using the above-described pantograph mechanism, so that it can be easily extended and contracted, and the manhole protection fence M is used (see FIGS. 1 and 4(b)). Formation of a certain rectangular frame space S and folding of the connecting means 500 in the stored state (see FIG. 4(a)) can be performed quickly.

In addition, in the diagrams showing the present embodiment, the rectangular frame space S formed by maximally extending the connecting means 500 has a substantially square shape in a plan view (see FIG. 1), but the maximum extension of the telescopic fence 510 is further increased. By increasing the length, the rectangular frame space S may be widened to allow multiple people to work inside. In that case, it goes without saying that the size of the rectangular frame space S can be changed to any width by changing the extension width of the telescopic fence 510 .

Above the manhole protective fence M, there is provided a conveying means 600 for carrying in or out articles between the inside of the square frame space S and the outside of the square frame space S. As shown in FIG.

As shown in FIGS. 1, 2 and 5, the conveying means 600 comprises a rail 610 rotatably mounted substantially at the center of the upper rear horizontal beam 221 and a trolley 620 provided on the rail 610 .

The rail 610 is made of H steel longer than the depth of the square frame space S, and is provided near one end with a U-shaped rail support fitting 611 with the U-shaped curve facing outward.
The rail 610 is rotatably supported by inserting the upper rear horizontal beam 221 into an annular portion 612 formed by the rail 610 and the curved inner side of the rail support fitting 611 .

Further, the upper front horizontal beam 121 and the rail 610 are mutually provided with a rail connecting fitting 613 .
The rail connecting fitting 613 is a member that can be fitted with male and female. It is provided at a location corresponding to the position of the upper front horizontal beam 121 .

By configuring the rail 610 as described above, when the manhole protective fence M is housed, as shown in FIG. can be made unobstructed.

In addition, when the manhole protection fence M is used, that is, when the square frame space S is formed, the rail connection fitting 613 is connected to the upper front horizontal beam 121 to form a square frame as shown in FIGS. A rail 610 can be installed above the frame space S.

The trolley 620 is provided under a rail 610 installed over the rectangular frame space S and configured to be horizontally movable along the rail 610 .
Further, by making the rail 610 longer than the depth of the square frame space S, the tip of the rail 610 extends outside the manhole protection fence M, and the trolley 620 can move freely between the inside and the outside of the square frame space S. It is movable.

The conveying means 600 uses the rails 610 and the trolley 620 described above to transport workers working inside the manhole protective fence M, that is, inside the square frame space S and workers working outside the manhole protective fence M. It is possible to facilitate delivery of articles such as tools and construction materials between

Various types such as a known plain trolley, geared trolley, and electric trolley are preferably used as the trolley 620 of the present embodiment.

As shown in FIG. 2, shielding means 700 for shielding the rectangular frame space S from the outside are provided on the four sides of the lower half of the manhole protective fence M. As shown in FIG.
As shown in FIG. 6, the shielding means 700 includes four shielding portions 711 each having the same rectangular shape and a connecting portion in which the shielding portions 711 are arranged in a horizontal row and the adjacent shielding portions 711 are integrally connected. 712 , and locking holes 720 drilled at the four corners of each shielding portion 711 .

A substantially L-shaped locking hook 800 is provided on the front support 110, the rear support 210, and the door frame 141. As shown in FIG. The shielding means 700 can be attached to the protective fence M for manholes.
By attaching the shielding means 700 to the manhole protective fence M, the outer periphery of the four side surfaces of the manhole protective fence M can be covered so that the square frame space S cannot be visually recognized from the opening and articles can be prevented from entering from the outside. can.

As a specific mounting method, the shielding sheet 710 is attached to the locking hook 800 provided on the rotating end side of the door frame 141 and wrapped around the outer periphery of the four side surfaces of the manhole protection fence M. By doing so, entry into and exit from the inside of the square frame space S can be prevented from being hindered.

The shielding sheet 710 may be a cloth-like material capable of covering the manhole protective fence M, such as canvas, but a light-shielding and waterproof resin sheet is preferably used.
In addition, as shown in FIG. 6B, the shielding portion 711 of the shielding sheet 710 is printed with a sign that calls attention to the observer, so that the worker can work more safely. can contribute to

The locking holes 720 may simply be formed by drilling openings in the four directions of each of the shielding portions 711, but it is desirable to reinforce them with eyelets or the like. This prevents as much as possible the aging deterioration of the shielding means 700, which is expected to be easily deteriorated when the protective fence M for manholes is repeatedly used over a long period of time. This is because breakage due to the stress applied to 700 can be prevented as much as possible.

As described above, the manhole protective fence M according to the present invention can cover the upper part of the manhole opening H so as to surround the manhole opening H on all sides when working inside the manhole opening H, preventing the entry of articles and the fall of pedestrians. It is possible to provide a square frame space S that prevents accidents such as accidents.

In addition, by contracting the telescopic fence 510 that constitutes the connecting means 500, the protection fence M for manholes can be folded and made compact in the stored state.

In addition, by providing a conveying means 600 mainly composed of a rail 610 and a trolley 620 on the upper part of the protective fence for manholes M, a worker who works inside the square frame space S can work outside the protective fence for manholes M. Goods such as tools and construction materials can be easily moved between workers.

In addition, since the auxiliary means 250 that can be installed near the manhole opening H by the ladder connecting metal fittings 253 only when in use is provided, when the worker enters and exits the manhole opening H, the elevator provided inside the manhole As an extension of the ladder L, it can contribute to smooth work.

As mentioned above, although the manhole protection fence of this invention was demonstrated through embodiment mentioned above, this invention is not limited to these. Moreover, the various effects described above are merely enumerations of the most suitable effects resulting from the present invention, and the effects of the present invention are not limited to those described in this embodiment.

M Guard fence for manhole S Square frame space 100 Front frame 110 Front strut 111 Right front strut 112 Left front strut 120 Front horizontal beam 121 Upper front horizontal beam 122 Lower front horizontal beam 130 Front frame reinforcing member 140 Door 141 Door frame 142 Hinge fitting 200 Rear Frame 210 Rear strut 211 Right rear strut 212 Left rear strut 220 Rear horizontal beam 221 Upper rear horizontal beam 222 Middle rear horizontal beam 223 Lower rear horizontal beam 230 Rear frame reinforcing member 240 Front frame receiver 241 Bracket 242 Receiving part 250 Auxiliary means 251 Ladder support post 252 Ladder 253 Ladder connection fitting 300 Caster 310 Brake 400 Stabilizer 410 Cylindrical body 420 Fixing bolt 500 Connection means 510 Telescopic fence 511 Rod-shaped member 520 Fence connection fitting 521 Sliding support part 522 Rotating support part 600 Conveying means 610 Rail 611 rail support fitting 612 annular portion 613 rail connecting fitting 620 trolley 700 shielding means 710 shielding sheet 711 shielding portion 712 connecting portion 720 locking hole 800 locking hook G ground H manhole opening L climbing ladder

Claims (4)

A protective fence for manholes to be installed above the manhole opening,
a square-shaped front frame and a rear frame having two struts connected to each other;
connecting means for connecting the front frame and the rear frame so as to extend and contract within a certain range;
A square frame space is formed above the manhole opening by connecting the front frame and the rear frame with the connecting means,
A protective fence for a manhole, characterized in that the front frame and the rear frame can be folded by contracting the connecting means. The connecting means is
2. The protective fence for manholes according to claim 1, wherein the protective fence for manholes is an extensible fence utilizing a pantograph mechanism. a rail rotatably provided on the upper part of the rear frame;
a trolley mounted on the rail;
a rail connecting fitting provided on the front frame and the rail to allow the rail to be installed on the front frame and the rear frame;
provided with a transport means consisting of
3. The protective fence for manholes according to claim 1, wherein the trolley can transport articles between the outside and the inside of the square frame space. At least one of the front frame and the rear frame is provided with an auxiliary means for assisting workers in entering and exiting the manhole,
The auxiliary means is
A ladder that assists the worker in ascending and descending,
placing the ladder against at least one of the front frame and the rear frame,
a ladder connecting fitting that is movably connected and supported in the used state and the stored state;
4. The protective fence for manhole according to any one of claims 1 to 3, characterized in that it is composed of:

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