JP2002317456A - Manhole guard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole guard which is safe capable of preventing infiltration of water into a manhole even at the time of raining. SOLUTION: This manhole guard is provided with a cylindrical body 1 having an outer flange part 3 close to a lower end, and disposed to have an axial center in the vertical direction, and packing 2 engaged with the cylindrical body on the outer side of it in such a way as to be capable of getting in contact with a lower surface of the outer flange part 3. As the cylindrical body 1 is placed on a first step part 13 in a manhole mouthpiece 11, the packing 2 is elastically deformed between the outer flange part 3 and the manhole mouthpiece 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a manhole guard.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
When working in the space below the manhole 50 by opening the lid of, the cylindrical body 41 is placed on the stepped portion 46 of the manhole base 45,
The bolt 42 is inserted into the stepped portion 46 by the bolt hole on the inner surface of the cylindrical body 41.
A configuration is employed in which the positioning and fixing are performed by abutting on the vertical portion. In addition, a configuration is known in which water between the manhole base 45 and the cylindrical body 41 is stopped by a waterproof putty 43.

[0003]

When the work is being performed in rainy weather, rainwater enters through a gap between the cylindrical body 41 and the manhole base 45, leading to a reduction in the efficiency of work inside the manhole. Further, as shown in FIG. 5, in the configuration in which the water is stopped by the waterproof putty 43, when the manhole guard is moved, the waterproof putty is stopped.
There is a problem that the 43 also moves, peels off, and leaks water. In addition, each operation required about 5 kg of the waterproof putty 43. Once the waterproof putty 43 was used, it contained sand and dust and was difficult to reuse, so the efficiency was extremely low.

[0004] The space below the manhole may need to be connected to a high-voltage power cable or an optical fiber, etc., so it must be a clean room, and it is necessary to prevent rainwater from entering through the gap between the manhole and the manhole guard. there were.

Accordingly, an object of the present invention is to provide a safe manhole guard that prevents water from entering a manhole even in rainy weather.

[0006]

Means for Solving the Problems To achieve the above object, a manhole guard according to the present invention has a cylindrical body whose axis is disposed in a vertical direction.
It is provided with packing that can be sealed between the manhole base.

Further, a cylindrical body having an outer flange formed near the lower end and having an axial center disposed in a vertical direction, and a packing fitted to the cylindrical body so as to be able to contact the lower surface of the outer flange are provided. The packing is configured to elastically deform between the outer flange portion and the manhole base in a state where the cylindrical body is placed on the first step portion of the manhole base.

[0008] Further, the packing is formed of a tube which expands when air is injected. Further, a posture comprising a locking member which can be locked to a protruding portion formed on the inner peripheral surface of the manhole base, and a connecting member which has the locking member in a hanging shape and is fixed to the cylindrical body. It has holding means. Further, a small outer flange portion is formed on the cylindrical body below the packing. Further, it has at least one pair of support members erected on the cylindrical body and a horizontal beam bridging the upper part of the support members.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

The manhole guard according to the present invention is designed such that when the lid of the manhole 10 is opened and a worker works in the lower space of the manhole 10, a pedestrian or worker on the ground falls into the manhole 10. -Walls are erected around the outside of the manhole 10 to prevent the tool from falling into the manhole 10.

As shown in FIG. 1, a manhole guard according to the present invention mounts a cylindrical body 1 having a shaft center disposed in a vertical direction on a manhole base 11 with a cover of a manhole 10 opened. It was done. A handrail portion 7 and a middle rail portion 8 are arranged above the cylindrical body 1, and these are connected to a support member 9 to form a safety frame 16.
Can be inserted into and fixed to the sheath tube 15 attached to the inner peripheral surface of the cylinder, and the handrail portion 7 and the middle rail portion 8 can be removed from the cylindrical body 1.

The safety frame 16 is divided into two or more parts, and one pair of adjacent support members 9, 9 of each safety frame 16, 16 is fixed to the cylindrical body 1 with an interval. And
It is configured so that people can enter and leave from the interval. With this spacing, a chain 25, which is easily suspended, is hung between the support members 9, 9 so as to prevent a person from dropping unnecessarily, and is normally closed.

FIG. 2 shows a detailed view of the installation portion of the cylindrical body 1.
The opening of the manhole 10 is a metal manhole base 11
Is buried. The manhole base 11 has an exposed surface 12 which is flush with the ground surface, and a first stepped portion 13 on the inner peripheral side.
The projection 14 (for receiving the inner lid) serving as the second stepped portion 17 is exposed, and an anchor portion 18 is buried and fixed on the outer peripheral side in the ground.

As shown in FIG. 2, in the manhole guard of the present invention, a cylindrical body 1 having a vertical axis is placed on a first stepped portion 13 of a manhole base 11. An outer flange 3 is formed near the lower end of the cylindrical body 1.
Has a packing 2 which is fitted on the cylindrical body 1 so as to be able to contact the lower surface of the cylindrical body 1. This packing 2 has a manhole base 11
It is provided so as to be able to be sealed between them.

The packing 2 and the outer flange portion 3
Is placed on the first stepped portion 13 of the manhole base 11 and the packing 2 is set and arranged to elastically deform between the outer flange 3 and the exposed surface 12 of the manhole base 11. It is a thing. That is, the cylindrical body 1 is the first of the manhole base 11.
While placed on the horizontal part of the stepped part 13, the manhole base
The eleven surface exposed surface 12 and the outer flange 3 are configured to have a vertical gap d. The dimensional relationship between the gap d and the packing 2 is set such that the thickness of the packing in a state where the packing 2 has a crushing margin is substantially the same as the gap d. The crushing allowance of the packing 2 varies depending on the type of the packing 2 and is related to the water stopping performance.

As shown in FIG. 2, when the packing 2 is elastically deformed, the contact surface between the packing 2 and the exposed surface 12 and the contact surface between the packing 2 and the lower surface of the outer flange portion 3 are formed. Each of them constitutes a water stop surface for stopping water. The outer flange portion 3 has a function of preventing the packing 2 from moving upward.

The packing 2 that elastically deforms between the outer flange 3 and the exposed surface 12 is preferably made of a tube 4 that expands by injecting air, as shown in FIG. In this case, the cylindrical body 1 is first placed on the manhole base 11, and then the tube 4 is filled with air.

In other words, when the surface exposed surface 12 serving as the water stop surface of the manhole base 11 is damaged or damaged, the packing surface does not follow even a small wound with a ring-shaped packing having an even cross section. However, water may penetrate through the gap due to the small scratch. However, when the cylindrical body 1 is first placed on the manhole base 11 and then the tube 4 is filled with air, the tube 4 gradually expands, so that the surface of the manhole base 11 has irregularities and scratches. Even if there is, it deforms so as to follow the shape of the irregularities and scratches, and the tube 4
This has the function of gradually filling the gap between the manhole base 11, the cylindrical body 1 and the outer flange 3. Further, the air pressure of the tube 4 is about 1-2 kgf / cm ² , and it is not necessary to increase the air pressure much.

For filling the air into the tube 4, for example, by using the same type as the air injection port used for the tire tube of a bicycle, a special pump and attachment are not required, and manual operation is not required. It is possible to inject air into the tube 4 of the present invention and pressurize it.

The packing 2 may be an annular one made of foamed plastic or a cylindrical body 1 and a manhole base 11.
An L-shaped rubber packing that substantially matches the gap shape of the above may be used.

In the detailed view shown in FIG. 2, an annular small outer flange 26 is attached to the lower end of the cylindrical body 1 (below the packing 2). This is because when the manhole guard is installed, that is, when the cylindrical body 1 is placed on the first stepped portion 13 of the manhole base 11, the centering can be performed by the small outer flange portion 26. Is set to be easily possible. In addition, the small outer flange 26 and the outer flange 3 allow
As a result, a concave groove is formed.
Are disposed, and the packing 2 can be prevented from falling off. The small outer flange portion 26 has a cross section formed by a long-axis rod or the like having a circular shape, and is fixed to the lower end edge of the cylindrical body 1 by welding or the like.

Next, as shown in FIG. 3, the cylindrical body 1 has on its inner surface a locking member 21 which can be locked on a protruding piece 14 formed on the inner peripheral surface of the manhole base 11, and And a linking member 20 which has a locking member 21 in a hanging shape and is fixed to the cylindrical body 1. Protrusion
Reference numeral 14 denotes a second stepped portion 17 provided on the inner surface of the manhole base 11, which is a mounting portion for locking an inner cover (not shown).

The posture holding means 5 is provided at three places at substantially equal intervals in the circumferential direction above the cylindrical body 1 whose axis is vertical, and the fixing member 19, the connecting member 20 and the locking member 21 are provided from above.
Consists of The posture holding means 5 may be provided not only at three places as described above but also at four or more places.

More specifically, the fixing member 19 is a locking portion fixed at a position closer to the upper side of the cylindrical body 1, the connecting member 20 is a flexible tension member, and both ends of the connecting member 20 are respectively provided. , The fixing member 19 and the locking member 21
Length can be adjusted freely. Further, it is preferable that the length of the connecting member 20 can be adjusted while the locking member 21 is locked to the protruding piece portion 14. The linking member 20 is composed of a belt, a rope, a chain, and the like, and each end has a joint corresponding to the type.

As shown in FIG. 3, with the cylindrical body 1 placed at a predetermined position on the manhole base 11, the posture holding means 5 (two-dot chain line) in the free state is moved to the protruding piece of the manhole base 11. When the connecting member 20 is locked (solid line), the connecting member 20 is in a tensioned state, the cylindrical body 1 has a holding force in the axial direction downward direction, and the posture of the cylindrical body 1 is stably held. . Here, the adjustment of the length of the connecting member 20 described above can be performed in a state where the locking member 21 is locked to the protruding piece portion 14, so that the cylindrical body 1 is reliably restrained. It can be.

The locking member 21 is locked from below the protruding piece portion 14 and has a bent portion at the tip so as to prevent it from coming off. The shape of the locking member 21 is set according to the protruding piece 14, and the locking member 21 is configured so as not to be disengaged by the upward force of the manhole opening in the locked state with the protruding piece 14. .
Therefore, the shape may be the shape of the L-shaped claw shown in FIG. 3 or a flat plate (dashed line) 21 a having a shape fitted into the groove 14 a of the projecting piece 14.

Thus, the posture holding means 5 is provided on the cylindrical body 1.
Are provided at substantially equal intervals in the circumferential direction of the cylindrical body 1.
Can be stably stood so as not to fall down. Further, even if the type of the connecting member 20 is changed, the locking member 21 can be attached by a connecting tool corresponding to the type of the connecting member 20.

Next, as shown in FIG. 4, a horizontal beam 6 is provided in the upper part of the cylindrical body 1 in the diameter direction of the cylindrical body 1. That is, it is composed of at least one pair of support members 6a, 6a standing upright on the cylindrical body 1, and a horizontal beam 6 bridging the upper portions of the support members 6a, 6a. As also shown in FIG.
Two outer sheath tubes 22 are attached to the outer peripheral surface side of the cylindrical body 1 (at 180 ° intervals in FIG. 4), and the outer sheath tubes 22 have horizontal beams 6 as shown in FIG. The portal members 6a, 6a are inserted and fixed. At the approximate center of the horizontal beam 6, a fixture 23 is provided.
In the present invention, a chain block 24 is attached to the attachment 23. Thus, heavy objects such as materials and tools can be easily carried into the space (work position) below the manhole 10 from the ground.

In addition to the chain block 24, the horizontal beam 6 may be provided with a pulley, an electric / manual lifting device, and the like. In this way, the foundation of the elevating device can be constructed safely and without taking up space from directly above the manhole 10 to below the working position without any special support member.

The horizontal beam 6 forms a stable gate structure because the cylindrical body 1 is firmly fixed to the manhole base 11 by the posture holding means 5. Also,
In this case, as the connecting member 20 of the posture holding means 5, a chain or the like having no strength and elasticity is used, and the tension thereof can be adjusted by a chain block.

In order to further firmly hold the gate having the horizontal beam 6, although not shown, the handrail portion 7 shown in FIG. 1 is extended upward, and the handrail portion 7 What is necessary is just to make it contact so that it may support. Thereby, even if a large load acts on the horizontal beam 6, the column members 6a, 6a are unlikely to buckle and can stably hold the portal.

Although not shown, it is assumed that the entire manhole guard shown in FIG. 1 can be covered with a cylindrical vinyl rain shelter tent. This rain tent is
Fasteners are attached to places where workers enter and leave, opening and closing the fasteners to enter and exit the manhole, and have small windows for the blower. This eliminates the need for a separate rain tent or umbrella to be installed above the manhole in rainy weather, enabling space-saving measures to prevent rain, and there is no water leakage below the manhole guard. Things.

[0033]

According to the present invention, the following effects can be obtained by the above configuration.

According to the first aspect, the cylindrical body 1 serving as a guard is provided to prevent a person or an object from falling into the manhole 10. Also, in the rain, the manhole
It is easy to prevent water from entering the inside of the pipe.

According to the second aspect, the cylindrical body 1 serving as a guard can be stably installed at a predetermined position, and a person or an object can be prevented from falling into the manhole 10. Further, it is possible to easily prevent water from entering the manhole 10 in the rainy weather. The packing 2 performs a sealing action at an accurate position by the outer flange portion 3.

According to the third aspect, even if the manhole base 11 has irregularities and scratches, the packing 2 can reliably stop the water. Further, even if the inner diameter of the manhole base 11 is large and varies, water can be reliably sealed and stopped. Further, even if the cylindrical body 1 moves to some extent, the water stopping performance can be prevented from being lowered.

Furthermore, according to the fourth aspect, the cylindrical body 1 can be stably installed and fixed, and the worker can work safely in the space below the manhole 10. In addition, disengagement can be easily performed.

According to the fifth aspect, the centering of the cylindrical body 1 with respect to the manhole base 11 becomes accurate, and the packing 2 can be prevented from collapsing in the lateral direction. Moreover, the cylindrical body 1 can be more easily installed, and the packing 2 can be prevented from coming off.

(According to claim 6) With a simple structure,
It is possible to safely lift and suspend a heavy object in the space below the manhole 10.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a manhole guard of the present invention.

FIG. 2 is a side sectional view showing details of a main part of a manhole guard.

FIG. 3 is a side sectional view of a main part of another embodiment of a manhole guard.

FIG. 4 is a partially sectional side view showing another embodiment of the manhole guard.

FIG. 5 is a side sectional view showing an embodiment of a conventional manhole guide.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Packing 3 Outer flange part 4 Tube 5 Posture holding means 6 Horizontal beam 6a Support member 11 Manhole base 13 First stepped part 14 Protrusion part 20 Connecting member 21 Locking member

Claims (6)

[Claims] 1. A cylindrical body 1 having an axial center disposed in a vertical direction, and a packing 2 sealable with a manhole base 11 is provided near a lower end of the cylindrical body 1. Manhole guard to do. 2. A cylindrical body 1 having an outer flange 3 formed near a lower end and having an axial center disposed in a vertical direction, and is externally fitted to the cylindrical body 1 so as to be able to contact the lower surface of the outer flange 3. Packing 2;
And the cylindrical body 1 is a first stepped portion of a manhole base 11.
A manhole guard characterized in that the packing (2) is elastically deformed between the outer flange (3) and the manhole base (11) while being mounted on (13). 3. The manhole guard according to claim 1, wherein said packing comprises a tube which expands upon injection of air. 4. A locking member 21 which can be locked to a protruding piece 14 formed on an inner peripheral surface of the manhole base 11, and the locking member 21 is suspended and fixed to the cylindrical body 1. The manhole guard according to claim 1, further comprising a posture holding unit 5 including the linked connecting member 20. 5. The manhole guard according to claim 1, wherein a small outer flange portion is formed in said cylindrical body below said packing. 6. The apparatus according to claim 1, further comprising at least one pair of support members standing on said cylindrical body, and a horizontal beam bridging an upper portion of said support members. ,
The manhole guard according to claim 3, 4 or 5.