JP2693414B2 - Protective device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective device installed in a work space to protect a worker from falling objects.

[0002]

2. Description of the Related Art For example, in a propulsion method, which is a type of construction method for constructing a tunnel in the ground, a starting shaft is generally formed in the ground on the starting side, and a propulsion device is installed in this. A reaching shaft is formed at the target point for propulsion, and the propulsion is performed horizontally from the starting shaft to the reaching shaft.

The vertical shaft is a substantially cylindrical space open to the surface of the earth, and its inner surface is composed of a wall plate having a divided structure. Various materials such as propulsion devices, work tools, and propelling pipes propelled into the ground and bolts connecting the propelling pipes are unloaded from the ground in the shaft. Further, the excavated residual soil discharged from the propulsion device to the inside of the shaft due to the excavation is loaded into the earth and sand bucket and loaded outside the shaft.

[0004]

When carrying out and carrying in the above-mentioned materials, soil and the like between the shaft and the ground, if a transported object falls into the shaft, a serious accident may occur. That is, tools, bolts, stones, etc. that fall into the vertical shaft directly hit the worker inside the vertical shaft, or bounce off the wall plate or floor in the vertical shaft and crash into the worker from an unexpected direction, causing serious injury. May be incurred.

In order to prevent such a danger, the Occupational Safety and Health Act and the like prohibit simultaneous work (up and down work) at both upper and lower positions. However, some have pointed out that such rules may not be observed in practice.
For example, in the case of lifting / unloading a relatively light load,
It is said that the workers may evacuate to the corners of the shaft without evacuating, or they may evacuate while climbing a ramp and sticking to a midway position.

An object of the present invention is to provide a protective device capable of effectively protecting a worker from a falling object that can fly from any direction in a narrow working space such as a shaft.

[0007]

According to a first aspect of the present invention, there is provided a protective device installed in a work space for protecting a worker from a fallen object. The protective device includes an upper protective member and a lower protective member. It is provided with the upper protection member and a side protection member that partitions the protection space into the work space so as to be openable and closable.

According to another aspect of the present invention, there is provided a protective device which is installed in a working space defined by a wall and a floor to protect workers from falling objects. The upper protective plate member and the side protective member that is attached below the upper protective plate member along the outer edge of the upper protective plate member and divides the protective space for accommodating workers between the upper protective plate member and the floor so as to be openable and closable. It has.

According to a third aspect of the present invention, there is provided the protective device according to the second aspect, wherein the upper protective plate member is a landing attached to the inner surface of the wall in the working space. There is.

A protection device according to a fourth aspect is the protection device according to the third aspect, wherein the side protection member is connected to a guide member mounted on the lower surface of the landing along the outer edge of the landing. And a plurality of plate members suspended from the guide member so as to be movable.

The protection device according to claim 5 is the protection device according to claim 4, wherein:
It is characterized in that a shield having a height larger than a space between the plate and the floor is provided.

The protection device according to claim 6 is the protection device according to claim 5, wherein in the protection space,
Between the inner surface of the wall body and the inner surface of the plate member, a steady rest for preventing the plate member from swinging is provided.

The protection device according to a seventh aspect is the protection device according to the sixth aspect, characterized in that the plate member is made of a flexible material.

[0014]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is a perspective view showing an outline of a protective device 2 of the present invention provided inside a vertical shaft 1 as a working space. The vertical shaft 1 is a substantially cylindrical space opened to the surface of the earth, and the wall body 3 on the inner peripheral surface thereof is composed of a plurality of wall members, which are connected to each other in a divided structure (not shown).

The wall 3 is provided with a first trap 4 for descending from the ground into the shaft 1. The first ramp 4 reaches a landing 5 mounted on the wall 3. A second ramp 7 is provided between the landing 5 and the floor 6 of the shaft 1. The worker can move back and forth between the floor body 6 of the shaft 1 and the ground by the first ramp 4, the landing 5, and the second ramp 7. Landing 5
Can be set at an appropriate position depending on the depth of the shaft 1, etc.
If one of the purposes of installing the landing is to prevent falling when going up and down with a ramp, it is preferable to install it at a position higher than the height of the worker. Setting the dimensions and shape of the landing 5,
To the extent that there is no obstacle to the loading and unloading of cargo in the shaft 1,
It can be arbitrarily set according to the purpose of the landing 5.

The landing 5 of this embodiment is an upper protective plate member as an upper protective member which constitutes a part of the protective device 2. As shown in FIG. 2, the landing 5 has a frame member 5a connected to the wall 3 of the shaft 1, a net-like floor plate 5b attached to the frame member 5a,
It has a stay 5c for supporting them on the wall body 3.

Below the landing 5, a protective blind 8 as a side protection member is attached so as to be movable along the outer edge of the landing 5. The openable / closable protective blind 8 defines a protective space S for accommodating workers between the landing 5, the wall 3 and the floor 6. By opening and closing the protective blind 8, the protective space S can be freely closed or opened.

First, as shown in FIGS. 2 to 4, a guide member 9 is attached to the lower surface of the landing 5 along the outer edge of the landing 5 which is not in contact with the wall 3. As shown in FIG. 5, the guide member 9 includes a guide rail 10 having a substantially rectangular cross section and a groove 10a on the lower surface, and a guide wheel 11 movably engaged with the guide rail 10. A coupling tool 12 is attached to each of the plurality of guide wheels 11. The lower end of each connecting tool 12 has a groove 10 of the guide rail 10.
It projects downward from a. A vertically long rectangular plate member 13 that constitutes the main body of the protective blind 8 is attached to the lower end of each connector 12. As shown in FIG. 3, the plate members 13 are connected by hinges 14. When not in use, they can be stacked compactly on top of each other. When it is advanced along the guide member 9 at the time of use, it becomes a single wall shape, and the space below the landing 5 is partitioned as a protective space S. The height of the plate member 13 is slightly smaller than the distance between the landing 5 and the floor body 6, so that there is a slight gap between the lower end of the protective blind 8 and the floor body 6. Therefore,
The protective blind 8 can be smoothly moved along the guide member 9 without contacting the floor 6. The plate member 13 is made of a flexible plate member having a shock absorbing property such as a vinyl chloride plate, a metal plate, a plywood plate, a cardboard plate and the like.

As described above, the protective blind 8 has a gap between it and the floor 6 for smooth opening and closing.
If the fallen object is smaller than this gap, and the fallen object is reflected on the wall 3 or the like and flies like sliding on the floor 6, the fallen object jumps into the protective space S through this gap. It is possible to come. Therefore, as shown in FIG. 4, inside the protective space S defined by the protective blinds 8, a shield having a height above the floor 6 above the gap between the protective blinds 8 and the floor 6 is provided. An evacuation step 15 as a body is provided. The evacuation step 15 blocks a fallen object that tries to jump in through the gap between the protective blind 8 and the floor 6, and protects the feet of the worker who is evacuated therein. Further, since the lower end portion of the plate material 13 of the protective blind 8 is in contact with and supported by the evacuation step 15, it serves as a steady stop for the plate material 13 when an external force is applied to the protective blind 8.

As the shield, instead of the retracting step 15, a substantially L-shaped frame member 16 may be provided in the protective blind 8 as shown by the alternate long and short dash line in FIG. If the height of the flange on the front side of the frame member 16 is made larger than the clearance between the protective blind 8 and the floor 6, the frame member 16 can prevent the falling object from jumping in, like the retracting step 15. In addition, it also serves as a steady stop for the plate member 13. It is preferable that the retracting step 15 and the frame member 16 are configured to be movable, and are arranged and used at predetermined positions only when the protective blind 8 is closed and the protective space S is used.

As shown in FIG. 4, the protective blind 8
A steady rest 17 of the protective blind 8 is provided inside. A substantially rod-shaped steady rest 17 is rotatably attached to the wall 3 of the vertical shaft 1 via a hinge. In the figure, the broken line is the steady rest 17 in the storage position. The solid line in the figure indicates the steady rest 17 set in the use position. If this steady rest 17 is set between the substantially central portion of the protective blind 8 and the wall body 3, even if a large falling object collides with the protective blind 8, the protective blind 8 will cause the protective blind 8 to move.
It is not pushed to the side.

In the example described above, the vertical shaft 1 constructed in tunnel excavation work is illustrated as the work space in which the protection device 2 of the present invention is installed, but the same applies to work spaces in other types of work. Protection device 2
Can be applied.

Further, in the example described above, the landing 5 for the traps provided in the shaft 1 as the upper protection member.
Was illustrated. In this way, the existing equipment at the construction site may be used also as the upper protection member, but a dedicated member may be provided as the upper protection member.

Further, in the above-described example, the protective blind 8 in which a plurality of plate members 13 are connected by the hinges 14 is exemplified as the side protection member, but the side protection member is not necessarily folded in such a bellows structure. It doesn't have to be one. For example, a plurality of unconnected plate materials may be used for landing 5.
The protection space S may be partitioned by leaning between the floor space 6 and the floor 6. With such a side protection member, when not in use, they can be stacked on top of each other and stored compactly, and can also be taken out of the vertical shaft 1. Further, the protective space S may be defined by installing a flexible side protection member made of a single plate material below the landing 5 such as by leaning it between the landing 5 and the floor 6. If such a side protection member is used, it can be rolled up into a cylindrical shape and stored compactly when not in use, and can also be taken out of the vertical shaft 1.

Further, in the above-described example, the protective device 2 installed in the existing vertical shaft 1 has been described, but the protective device 2 may be used while being moved as the construction work of the vertical shaft 1 progresses. it can. That is, in order to construct the shaft 1, the wall body 3 is sequentially assembled in the hole while digging the vertical hole, and at that time, the landing 5 having the protective blind 8 of the present invention is required for the wall body 3. You may use it by temporarily fixing it to the position each time, or suspend the landing 5 from the support member provided on the ground through the chain block,
The vertical shaft 1 may be moved to an appropriate position for use when it is dug down.

The protection device of the present invention is used to protect workers from falling objects in the work space.
It can also be used to protect equipment and the like installed in the work space, and the word "worker" in the claims also has a broad meaning of being protected.

[0027]

According to the present invention, an openable / closable protective space can be defined in the working space. Even if there is a fallen object in the work space, the workers, equipment, etc. evacuated in this protection space will not be harmed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an overall configuration of a vertical shaft 1 according to an example of an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a plan view of a shaft 1 according to an example of an embodiment of the present invention.

FIG. 3 is a protection device 2 according to an example of an embodiment of the present invention.
FIG.

FIG. 4 is a protection device 2 according to an example of an embodiment of the present invention.
FIG.

FIG. 5 is a protection device 2 according to an example of an embodiment of the present invention.
It is the elements on larger scale sectional view.

[Explanation of symbols]

 1 Vertical shaft as working space 2 Protective device 3 Wall body 5 Landing land which is upper protective plate material as upper protective member 6 Floor body 8 Protective blind as side protective member 9 Guide member 13 Plate material 15 Evacuation step as shield 16 Shielding Frame material as body 17 Sway stop S Protected space

Continuation of the front page (73) Patent holder 000106726 C1 Kasei Co., Ltd. 1-18-1, Kyobashi, Chuo-ku, Tokyo (73) Patent holder 391047190 Okasan Kogyo Co., Ltd. 2-5-5 Shibadaimon, Minato-ku, Tokyo ( 72) Inventor Katsukuni Ashino 3-1-2 Takada, Chigasaki City, Kanagawa Prefecture (72) Inventor, Hiroshi Shibuya 1190, Kamisuda Town, Hodogaya-ku, Yokohama City, Kanagawa Shibuya Construction Co., Ltd. (72) Inventor, Shuichi Ishikawa, Tokyo Chiyoda 2-4-1 Blacksmith Town, Nitto Construction Co., Ltd. (72) Inventor Kazuhiro Matsumoto 2-4-5 Sakaemachi, Soka City, Saitama Miyama Sangyo Co., Ltd. (72) Inventor Kazuo Matsumoto, Chuo-ku, Chuo-ku, Tokyo Chome 18-1 CAI Kasei Co., Ltd. (72) Inventor ▲ Takahashi Hiroshi Hashimatsucho, Minato-ku, Tokyo 2-6-2 Towa Hamamatsucho Building 7F Okasan Kogyo Co., Ltd. (56) References Special Kaihei 7-23511 (JP, A)

Claims (7)

(57) [Claims] 1. A protection device installed in a work space for protecting workers from falling objects, wherein the protection device is provided below the upper protection member and the protection space is opened / closed in the work space together with the upper protection member. A protection device including a side protection member that freely divides. 2. A protective device installed in a work space defined by a wall body and a floor body to protect workers from falling objects, the upper protection plate member being installed in the work space, and the upper protection plate member. A protective device that is attached below an upper protective plate along an outer edge and includes a side protective member that partitions a protective space for accommodating a worker between the upper protective plate and a floor so as to be openable and closable. 3. The protective device according to claim 2, wherein the upper protective plate member is a landing attached to the inner surface of the wall body in the working space. 4. The guide member, wherein the side protection member is attached to the lower surface of the landing along the outer edge of the landing, and a plurality of plate members connected to each other and movably suspended from the guide member. The protection device according to claim 3, which further comprises: 5. The protective device according to claim 4, wherein a shield having a height larger than a space between the plate and the floor is provided on the floor in the protective space. 6. The protection device according to claim 5, further comprising a steady stop provided between the inner surface of the wall body and the inner surface of the plate member in the protective space to prevent the plate member from swinging. 7. The protective device according to claim 6, wherein the plate member is made of a flexible material.