JP2000345575A - Falling preventing tool for rubble or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rubbles from falling to a sewage or the like in the case of the replacing works of a holding frame for a cover for a manhole, and to eliminate the need for pick-up works accompanied by a danger. SOLUTION: The falling preventive tool 1 for rubbles or the like used for the replacing works of a holding frame for a cover executed to a manhole has a suspended frame body 3, in which diametral size can be changed and which is inserted to the holding frame, a fallen-object housing section 4 in which an upper opening end section 4a is arranged along the suspended frame body and a fallen object 12 is housed, using the suspended frame body side as a housing port and a supporter 2 being installed to a ground surface, holding the fallen-object housing section through connecting members 5 and preventing the falling of the housing section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for preventing rubble and the like from falling into an underground passage when replacing a holding frame for a manhole cover.

[0002]

2. Description of the Related Art Manholes for forming openings on the ground are installed in sewers and common ditches. This manhole is a disk-shaped metal holding frame that holds a metal lid, for example, placed and buried in the upper opening of a vertical hole that leads to the sewer, and the ground surface is covered with this lid covered. And the lid are flush.

When such a manhole is provided on a road, the holding frame receives a strong vibration when the vehicle passes. If this vibration is applied frequently, the holding frame may be damaged, and if the vibration is remarkable, a part thereof may be damaged.

[0004] Then, a gap may be formed between the ground surface and the manhole, the holding frame itself may rattle, and a substantially flat lid may eventually tilt. In such a situation, the road is depressed or has an uneven surface, which not only hinders the traffic of the vehicle but also has a risk of causing a traffic accident.

In order to avoid this problem, the holding frame of the manhole is replaced regularly or at any time. In this replacement work, the outer peripheral portion of the holding frame with the cover removed is dug down along the vertical hole. Expose the entire holding frame. Then, after removing the holding frame, a new one is installed and buried again with excavated soil.

[0006]

However, when the manhole holding frame is replaced in this way, it is necessary to dig down the outer periphery of the holding frame along the vertical hole, so that rubble generated during the excavation work may be removed from the vertical hole. Fall well. In addition, the operator sometimes drops a notebook, a mobile phone, or the like stored in the pocket.

[0007] Falling objects such as rubble may cause clogging of the sewage if left in the sewerage system, and are often required to be picked up after work is completed. However, sewers and the like are provided deep underground, and because of the passage of dirt, there is a case where oxygen is low and gas harmful to the human body is generated.

[0008] If the worker enters the sewer without noticing this, it may cause personal injury due to lack of oxygen or gas poisoning.
In order to avoid this harm, an oxygen mask, a gas mask, and the like must be prepared, and the work must be performed with these masks attached as necessary, and sometimes an oxygen supply device must be prepared, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and prevents rubble and the like from falling into a sewer during replacement work of a holding frame for a manhole cover, and can eliminate dangerous picking-up work and the like. An object of the present invention is to provide a fall prevention tool.

In order to solve the above-mentioned problems, the inventor of the present invention invented a device for preventing falling of rubble and the like, which is a basic invention of the present invention, and has already filed a patent application (Japanese Patent Application No. Hei 11 (1999)).
No. 13552). However, in the invention according to the earlier application, there is a gap between the inner peripheral surface of the holding frame or the concrete pile and the suspension frame (the opening of the falling object storage unit),
The present invention aims to prevent rubble and the like from falling from the gap in some cases.

[0011]

The tool for preventing falling of rubble and the like according to the present invention is used for replacing a holding frame of a lid covered on a manhole. The tool for preventing falling of rubble and the like according to the present invention has the following configuration to achieve the above object.

(1) A hanging frame body whose diameter dimension is variable and which is inserted into the holding frame. Preferably, the support is an annular frame having a diameter larger than the inner diameter of the holding frame. (2) A fallen object storage section in which an upper open end is arranged along the suspension frame body and which stores a fallen object using the suspension frame side as an accommodation port.
Preferably, the fallen object storage section is formed of a bag-shaped or basket-shaped net basket. (3) A support that is installed on the ground surface and holds the fallen object storage section via a connecting member to prevent the fallen object from falling. Preferably, the suspension frame body is configured such that a leaf spring is formed into a substantially annular curved shape, and that both ends of the leaf spring can be positioned at an arbitrary position while being substantially overlapped with each other.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a fall prevention tool 1 for rubble and the like according to an embodiment of the present invention.

The drop prevention tool 1 is used for replacing a holding frame 7 of a lid covered on a manhole 6 on a road shown in FIG. 4 and the like, and includes a support (annular frame) 2 and a suspension frame. 3, a falling object storage unit (mesh basket) 4 and a connecting member (chain) 5. FIG. 2 is an exploded perspective view showing the hanging frame 3 and the fallen object container 4, and FIG. 3 is a partial longitudinal sectional view of the assembled state.

The support 2 is installed on the ground surface, and holds the fallen object container 4 above the vertical hole 8 via the connecting member 5. The support 2 of this embodiment is formed of an annular frame, and its outer diameter is made sufficiently larger than the inner diameter of the holding frame 7 so that
The annular frame body 2 passes through the holding frame 7 and prevents the fall prevention device 1 from falling into the vertical hole 8.

The annular frame 2 in the illustrated example is made of a circular annular high-strength metal pipe or the like. The annular frame 2 is
The outer diameter is made considerably larger than the maximum outer diameter of the holding frame 7 so that when placed on the ground surface 10, the excavation area including the holding frame 7 can be sufficiently surrounded. At four radially inner portions of the outer peripheral surface of the annular frame 2 at equal intervals in the circumferential direction, metal fittings 2a for connecting one end 5a of the connecting member 5 are welded. .

The hanging frame 3 holds the upper open end 4a of the bag-like squirrel cage 4 which is open upward, and forms an opening of the fallen object container 4. The diameter of the suspension frame 3 is variable. Thereby, when the diameter is reduced, the outer diameter is configured to be slightly smaller than the inner diameter of the lid receiving portion 7c formed on the inner peripheral surface of the holding frame 7, and the hanging frame is extended along the length direction of the holding frame 7. The body 3 and the fallen object container 4 can be inserted without any trouble. On the other hand, when the diameter is expanded, the opening 4a of the fallen object container 4 is arranged along the inner peripheral surface of the holding frame 7 or the like so as to substantially contact the inner peripheral surface of the holding frame 7 or the inner peripheral surface of the concrete pile 9. It is configured to be able to.

The suspension frame 3 of this embodiment is formed by forming an elongated strip-shaped leaf spring into a substantially annular curved shape.
The b and 3c are configured so as to be positioned at an arbitrary position while substantially overlapping each other. In the illustrated example, both ends 3b,
A substantially rectangular operation piece 3d, 3e is fixed to 3c, and the other operation piece 3 is attached to each operation piece 3d, 3e.
The ends 3c and 3b of the leaf springs on the sides e and 3d are slidably inserted. In other words, the other end 3c of the leaf spring is movably inserted into the operation piece 3d fixed to the one end 3b of the leaf spring, and the operation piece 3 fixed to the other end 3c of the leaf spring.
One end 3b of a leaf spring is movably inserted into e.

Thus, between the operation pieces 3d and 3e,
Both end portions 3b and 3c of the leaf spring are arranged so as to be substantially overlapped. Each of the operation pieces 3d and 3e can be moved in the circumferential direction and can be stopped at an arbitrary position. Therefore, the length of the substantially overlapping portion of both ends 3b and 3c of the leaf spring can be changed, and the diameter of the hanging frame 3 and thus the diameter of the opening 4a of the fallen object container 4 can be changed.

In the suspension frame 3 of the illustrated example, latches 3a are integrally provided at four positions at equal intervals in the circumferential direction at the upper end of the leaf spring. In FIG. 2, a substantially rectangular piece is provided extending inward in the radial direction, and a round hole is formed through the substantially rectangular piece in the vertical direction.

In the present embodiment, the fallen object storage unit 4 is a net basket using a bottomed bag-like sagger-shaped net, and is formed of a material such as chemical fiber, metal, hemp, or the like. Net basket 4
Is preferably made of a flexible and easily foldable material. The mesh basket 4 is formed by winding the opening portion 4a around the suspension frame 3 and fixing it, or by binding it together to integrate it.

In the illustrated example, planar fasteners 4c and 4d which are detachably joined to each other are provided at positions corresponding to the vertical direction at required circumferential positions near the opening end of the mesh basket 4.
As a result, the upper end of the mesh basket 4 is folded downward, the hanging frame 3 is disposed at the folded portion, and the piece 4c of the planar fastener provided at the end of the folded portion of the mesh basket 4 is correspondingly formed. Then, the mesh basket 4 can be attached to the suspension frame 3 by being joined to the other piece 4d of the planar fastener provided on the mesh basket 4.

As a result, the net basket 4 is suspended from the hanging frame 3 without leaving a gap between the hanging frame 3 and the net basket 4, and the circular ring-shaped hanging frame 3 side drops the falling object. Accommodation opening 4a
Becomes The mesh basket 4 from the opening 4a to the bottom 4b
Is set to have an appropriate length in accordance with the storage capacity of falling objects.

The net basket 4 thus formed is connected to the annular frame 2 by a connecting member 5. The connecting member 5 of this embodiment is made of an iron chain. In the illustrated example, four chains 5
And each end 5a is connected to a latch 2a of the annular frame 2.
The other end 5b is firmly hooked to the hook 3a of the suspension frame 3.

It is to be noted that the hanging member 3 is not provided with the hook 3a, but the ring member at the lower end of the connecting member (chain) 5 is passed through the hanging frame (leaf spring) 3 so that the connecting member 5 and the hanging member 3 are suspended. The frame 3 may be connected. The length of the chain 5 is such that when the annular frame 2 is placed on the ground surface 10 and the basket 4 is put in the vertical hole 8 and suspended, the falling objects including the rubble 12 are leaked by the basket 4. It is set to be a depth that can be accommodated without any.

The manhole 6 has a holding frame 7 installed at an upper opening of a vertical hole 8 extending from the ground surface 10 of the road shown in FIG. 4 to a sewer not shown, and an opening 7 a held by the holding frame 7. It consists of lids (not shown) for covering, each of which is formed of a highly rigid metal.

The holding frame 7 has a substantially short cylindrical shape, and extends outward at the outer peripheral edge of the opening 7a to form a flange-shaped overhang 7b, while causing a step on the inner peripheral surface. A lid receiving portion 7c is formed, and a lower end portion of the lid is placed on the lid receiving portion 7c.

The holding frame 7 is also provided with a connecting portion 7d by forming a step on the outer peripheral surface on the lower end 7e side, and the connecting portion 7d is connected to a concrete pile 9 forming a part of the vertical hole 8.
The concrete holding frame 7 is connected to the concrete pile 9 and the entire holding frame 7 is placed underground 1 with the holding frame 7 connected thereto.
1 to be buried.

Since the manhole 6 thus formed is easily damaged when provided on a road, it is necessary to replace the holding frame 7 with a new one. The replacement work of the holding frame 7
The underground 11 is excavated along the vertical hole 8 from the ground surface 10 of the road, and the fall prevention tool 1 is used during this excavation operation.

Next, the replacement operation of the manhole will be described. FIGS. 4 to 9 are schematic cross-sectional views showing the state during the manhole replacement work, and are shown in chronological order in FIGS. 4, 6, 8, and 9. FIG. 5 is a cross-sectional view in the state of FIG. 4, and FIG. 7 is a cross-sectional view in the state of FIG.

First, an operator opens the manhole 6 to be replaced and removes it from the holding frame 7. Next, as shown in FIG. 4, the net basket 4 of the falling object container 1 is inserted into the manhole 6 from the opening 7 a of the holding frame 7. At this time, the suspension frame 3 moves the operation pieces 3d and 3e provided at both ends 3b and 3c of the leaf spring in a direction away from each other, so that the overlapping portion of both ends 3b and 3c of the leaf spring is formed. To increase the diameter. The diameter of the suspension frame 3 can be adjusted by temporarily removing the planar fasteners 4c and 4d of the mesh basket 4 near the operation pieces 3d and 3e.

The annular frame 2 is placed on the ground surface 1 around the holding frame 7.
0, the chains 5 are gripped, the mesh basket 4 is lowered into the vertical holes 8, and the chains 5 are stretched without slack. As shown in FIG. The basket 4 is located at () and is suspended in a horizontal state.

As shown in FIGS. 6 and 7, the operation pieces 3 provided on both ends 3b and 3c of the leaf spring of the suspension frame 3 are provided.
By operating d and 3e, the diameter of the suspension frame 3 is increased to a position where the suspension frame 3 is substantially in contact with the inner peripheral surface of the holding frame 7 or the concrete pile 9. That is, both ends 3 of the leaf spring
By moving the operation pieces 3d and 3e provided on the b and 3c in directions approaching each other, both ends 3b and 3c of the leaf spring are moved.
The polymerized portion is reduced to increase the diameter. Thereby, the opening 4a of the fallen object storage unit 4 can be arranged along the inner peripheral surface of the holding frame 7 or the concrete pile 9, and there is no gap between the two 7 (9) and 4 (4a). Thus, all of the falling objects 12 can be surely put into the falling object storage unit 4.

Subsequently, excavation work is started from the ground surface 10 around the holding frame 7. In this excavation, a rock drill utilizing high-pressure compressed air is usually used to excavate along the length direction of the holding frame 7 as shown in FIG.

At the time of this excavation, the rock surface drill crushes the solid ground surface 10 and the surface layer around the holding frame 7 one by one.
The annular frame 2 has an outer diameter considerably larger than the holding frame 7,
In addition, since it can be freely moved just by being placed on the ground surface 10, the annular frame 2 does not hinder the work, and the annular frame 2 does not enter into the pit generated during excavation. Therefore, the net basket 4 in the vertical hole 8 is always kept almost horizontal.

When excavating a hard ground surface 10 or underground 11 with a rock drill, debris 12 made of asphalt or concrete debris may be scattered, or a vertical hole 8 may be used to remove excavated soil outside the holding frame 7. Even if it falls inside, almost all of it is accommodated in the net basket 4.

Further, even if the operator drops a notebook, tools, etc., all of them are received by the net basket 4. Furthermore, if the upper opening 4a of the mesh basket 4 is arranged below the connecting portion between the holding frame 7 and the concrete pile 9, the connecting portion (the upper end 9a of the concrete pile 9 in the illustrated example). Excavation progresses to the extent that can be seen, and even if soil or rubble 12 falls into the vertical hole 8 from the gap of the connection part,
They are not contained in the net basket 4 and fall into the sewer.

Then, the holding frame 7 and the concrete pile 9
When the excavation operation is completed, an excavation area 11a is formed such that the connection portion with the ground can be clearly seen from the ground surface 10.
The basket 4 is pulled out of the vertical hole 8 and the soil and rubble 12 accumulated at the bottom 4b are discarded. When pulling up the net cage 4, the diameter of the suspension frame 3 is appropriately reduced in advance.

Thereafter, when the holding frame 7 is removed from the vertical hole 8, the upper opening of the vertical hole 8 is greatly expanded as shown in FIG.
Excavation area 11a exposes upper end 9a of concrete pile 9.

Then, the new holding frame 7 is placed on the upper end 9a of the concrete pile 9 and connected, and after the soil is buried around the holding frame 7 and hardened, it is covered with asphalt or concrete. Then, when the lid is put on the holding frame 7, a series of replacement work of the holding frame 7 is completed.

[0041]

As described above in detail, according to the tool for preventing falling of rubble and the like of the present invention, when replacing the holding frame of the lid covered on the manhole, the fallen object storage portion is moved from the holding frame side to the sewer. When inserted into a vertical hole communicating with the like, the fallen object storage portion is held via a connecting member by a support disposed on the ground surface, and the fallen object storage portion is positioned halfway through the vertical hole. Therefore,
When excavating around the holding frame, rubble, excavated soil, and the like that fall into the vertical hole are stored in the fallen object storage unit and are prevented from falling into the sewer.

Moreover, by making the diameter of the suspension frame variable, the diameter of the suspension frame is increased after the fallen object storage portion is inserted into the vertical hole, and the inner surface of the holding frame or the vertical hole is formed. The rubble and the like can be prevented from dropping into the vertical hole from the gap between the inner peripheral surface of the holding frame and the like and the upper opening of the falling object container.

Because of this, it is not necessary to pick up foreign matter such as rubble that has fallen into the sewerage during the replacement of the holding frame in order to prevent clogging as in the conventional case. This has the effect of avoiding the danger of easily entering the sewer and eliminating the need for special safety equipment to prevent the danger.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a tool for preventing rubble or the like from falling according to the present invention.

FIG. 2 is an exploded perspective view showing a hanging frame and a fallen object container of the fall prevention device of FIG. 1;

FIG. 3 is a partial longitudinal sectional view showing an assembled state of a hanging frame body and a fallen object container of FIG. 2;

FIG. 4 is a schematic longitudinal sectional view showing a state in which the fall prevention tool of FIG. 1 is set at the time of replacing the holding frame of the manhole cover.

FIG. 5 is a cross-sectional view of the state of FIG.

FIG. 6 is a schematic longitudinal sectional view showing a state in which the fall prevention tool of FIG. 1 is set at the time of replacing the holding frame of the manhole cover.

FIG. 7 is a cross-sectional view of the state of FIG. 6;

FIG. 8 is a schematic vertical sectional view showing an excavation step at the time of holding frame replacement work.

FIG. 9 is a schematic longitudinal sectional view showing a state where a holding frame is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fall prevention tool 2 Support (annular frame) 3 Hanging frame 3b, 3c Both ends of a leaf spring 4 Falling object accommodation part (mesh basket) 4a Upper open end part (accommodation opening) 5 Connecting member (chain) 6 Manhole 8 Vertical hole 7 Holding frame 9 Concrete pile 10 Ground surface 12 Falling object (rubble, etc.)

Claims (2)

[Claims] A tool for preventing falling of rubble and the like used for replacing a holding frame of a cover to be covered on a manhole, the diameter of the hanging frame being variable, the hanging frame being inserted into the holding frame. An upper opening end portion is arranged along the suspension frame body, and a falling object storage portion for storing a falling object with the suspension frame side as a storage opening; and a falling object installed on the ground surface and connected via a connecting member. A fall prevention tool for rubble and the like, comprising: a support for holding the storage section and preventing the fall thereof. 2. The support body is an annular frame body having a diameter larger than the inner diameter of a holding frame, the fallen object storage unit is formed of a bag-like ladder-like net basket, and the hanging frame body is 2. The rubble or the like according to claim 1, wherein the leaf spring is formed to be curved in a substantially annular shape, and both ends of the leaf spring can be positioned at an arbitrary position while being substantially overlapped. Fall prevention tool.