Skin-repellent protective guard

Abstract

To provide a rock fall protection guard which can reliably protect operators and is simple to install and move.SOLUTION: A rock fall protection guard 100 comprises a protection plate body 10 having a width exceeding the width of the human body, a flat plate 11 extending in a vertical direction, and a curved portion 12 extending convexly and curving continuously from an upper end of the flat plate 11. The rock fall protection guard 100 further comprises a side protection plate 20 extending from a lower end of the protection plate body 10 to a predetermined height and extending from one side end of the protection plate body 10 in a direction in which the curved portion 12 curves.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a skin-falling prevention guard at a tunnel face.

Background Art

[0002] In mountain tunnel construction, the face is cut down by blasting using explosives, and the generated slippage (rock debris) is transported outside the tunnel to advance the tunnel. After reinforcing the unstable tunnel excavation face by spraying concrete or the like, a shoring is installed and concrete covering is performed.

[0003] When performing operations such as loading explosives for blasting, removing loose rocks and rock masses protruding from the tunnel excavation face with an iron bar or the like (chiseling work), spraying concrete on the tunnel excavation face, and erecting a shoring, the workers approach the tunnel excavation face to work.

[0004] At that time, falling rocks (skin falling) from the tunnel excavation face may occur, and the workers may be exposed to danger. Conventionally, there is a device that uses a shoring to protect workers from skin falling, but it does not exist before the installation of the shoring. Therefore, before the installation of the shoring, the workers were protected by attaching a roof-shaped protective device to the drill jumbo, but there were problems in handling due to the safety of the workers and the fact that the protective device was a heavy object.

[0005] Therefore, Patent Document 1 discloses a protective net in which a net is stretched over a support frame having a plurality of horizontal crossbars horizontally mounted between a pair of left and right columns in a "V" shape. The upper and lower ends of the columns are each formed to be sharp, and the upper sharp part is pierced into the side wall surface of the tunnel excavation face, and the lower sharp part is pierced into the floor surface of the tunnel excavation face for installation.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] However, the protective net described in Patent Document 1 above cannot protect workers from soil and other debris that fall from the side walls or ceiling of the tunnel excavation surface and slip through the net. Furthermore, since the sharp ends of the net must be driven into the tunnel excavation surface during installation, the net must be driven in and removed each time the installation location is moved, making the installation and relocation work cumbersome.

[0008] In view of the above, the present invention aims to provide a skin-slip protective guard that can reliably protect workers and is easy to install and move. [Means for solving the problem]

[0009] The skin-slip protection guard of the present invention is characterized by comprising a first protective plate having a width exceeding the width of the human body and extending in the vertical direction, and a second protective plate that extends in a convex curve continuously from the upper end of the first protective plate.

[0010] The protective guard for preventing falling debris according to the present invention can be installed simply by leaning the second protective plate against the side wall of the tunnel excavation surface, with the lower end of the first protective plate in contact with the floor surface of the tunnel excavation surface. Therefore, installation and relocation work is easy. In addition, the second protective plate makes it possible to protect workers from soil and other debris falling from the side walls and ceiling of the tunnel excavation surface.

[0011] In the skin-dropping protective guard of the present invention, it is preferable to provide a third protective plate that extends from either side end of the first protective plate in the direction in which the second protective plate curves, extending from the lower end of the first protective plate to a predetermined height.

[0012] In this case, by installing the protective guard so that the side with the third protective plate faces the tunnel face, it is possible to protect workers from falling debris from the tunnel face. Furthermore, since the third protective plate only extends to a predetermined height, workers can see the tunnel face, allowing them to take safe actions against falling debris from the tunnel face.

[0013] Furthermore, in the skin-slip protection guard of the present invention, it is preferable to have at least one handle provided on the inner surface of the curved part of the second protective plate of the first protective plate.

[0014] In this case, the worker can easily move the skin-slip protection guard by gripping the handle with their hand.

[0015] Furthermore, in the skin-slip protection guard of the present invention, it is preferable that the first protective plate, the second protective plate, and the third protective plate each consist of a foamed resin plate sandwiched between fiber-reinforced resin plates.

[0016] In this case, the foamed resin plate provides shock absorption, and the fiber-reinforced resin plate provides strength, while also reducing weight. This makes it easier to move the skin-slip protective guard. [Brief explanation of the drawing]

[0017] [Figure 1] A schematic side view showing the state of use of the skin-repellent protective guard according to an embodiment of the present invention. [Figure 2] Schematic front view of the skin-dropping protective guard as seen from line I-II in Figure 1. [Modes for carrying out the invention]

[0018] A skin-slip protective guard 100 according to an embodiment of the present invention will be described with reference to Figures 1 and 2. Note that Figures 1 and 2 are schematic diagrams illustrating this embodiment, and the dimensions are simplified.

[0019] The muscle-falling prevention guard 100 includes a protection plate main body 10 and a side protection plate 20 provided on one side of the protection plate main body 10. The muscle-falling prevention guard 100 is used in a state where the lower end of the protection plate main body 10 is grounded on the bottom surface A of the tunnel excavation surface and the upper end of the protection plate main body 10 is leaned against the side wall surface B of the tunnel excavation surface.

[0020] The protection plate main body 10 protects the worker S from muscle-falling while securing a working space for the worker S existing between the protection plate main body 10 and the side wall surface B of the tunnel excavation surface. The protection plate main body 10 protects the worker S from muscle-falling from the side wall surface B and the ceiling surface of the tunnel excavation surface, and the side protection plate 20 protects the worker S from muscle-falling from the face C. There are two types of muscle-falling prevention guards 100 according to the position where the side protection plate 20 is provided. The worker S selects and uses the muscle-falling prevention guard 100 in which the side protection plate 20 is located on the face C side.

[0021] The protection plate main body 10 is formed of a lightweight and high-strength material such as reinforced plastic, a light metal such as aluminum or its alloy. Here, the protection plate main body 10 has a structure in which a foamed styrene plate is sandwiched from both sides by FRP (Fiber Reinforced Plastics) plates and these are integrated, and the total thickness is several tens of mm. Thereby, it is possible to achieve weight reduction while ensuring impact absorption performance by the foamed resin plate and strength by the fiber reinforced resin plate. It is also preferable to stack a plurality of FRP plates.

[0022] The protection plate main body 10 has a rectangular flat plate portion 11 and a curved portion 12 that continuously extends upward from the upper end of the flat plate portion 11. The widths of the flat plate portion 11 and the curved portion 12 are the same, wider than the width of the body of the worker (human) S, for example, about 1 m. And the height of the flat plate portion 11 is up to a predetermined height from the ground and about the height of the worker S, for example, about 1.5 m.

[0023] The curved portion 12 is curved in an arc shape, an elliptical arc shape, etc. so as to be convex outward. Since the curved portion 12 having an arc shape that is convex toward the inside of the tunnel is curved in this way, it has excellent strength against impacts from the outside such as falling rocks, and it is possible to protect the operator S below it.

[0024] Note that the curved portion 12 is not limited to an arc shape with a uniform radius of curvature throughout or an elliptical arc shape with a gradually changing radius of curvature, and portions with different radii of curvature may be connected. Also, the curved portion 12 may have a planar portion. Furthermore, the boundary between the flat plate portion 11 and the curved portion 12 may be continuous or discontinuous.

[0025] The side protection plate 20 is also formed from a lightweight and high-strength material such as reinforced plastic. The side protection plate 20 is preferably formed from the same material as the protection plate body 10.

[0026] Here, the side protection plate 20 is a rectangular flat plate, and its side end face is fixed to the inner surface of one side end of the flat plate portion 11 of the protection plate body 10 with an adhesive or the like. However, the side protection plate 20 may have linear or curved cutouts formed at the upper end portion or the like on the side opposite to the fixing portion with the protection plate body 10.

[0027] The lower end face of the side protection plate 30 is parallel to the lower end face of the flat plate portion 11 of the protection plate body 10. Thereby, it becomes possible to stably ground the lower end portion of the protection plate body 10 on the floor surface A of the tunnel excavation face. Here, the lower end face of the side protection plate 20 and the lower end face of the flat plate portion 11 are on the same plane, but there may be a slight step.

[0028] The side protective plate 20 has a predetermined height, which in this case is the height of the worker S's waist or chest. The side protective plate 20 may also be made entirely or partially from a transparent or translucent material to make it even taller. A notched window may be provided in a part of the upper part of the side protective plate 20, and such a window may be covered with a transparent or translucent material. In this way, the worker S can see the face C side well without their view being obstructed by the side protective plate 20.

[0029] Furthermore, the side protective plate 20 is provided only on the face C side. This allows the worker S to quickly evacuate to the opposite side of the face C if a large amount of material falls from the face C side. However, the side protective plate 20 may also be provided on the opposite side of the face C side. In this case, the protective plate body 10 can be standardized to one type.

[0030] Furthermore, the skin-slip protective guard 100 is equipped with a handle 30 suitable for the worker S to grasp by hand, in order to facilitate movement. Here, only one handle 30 is attached to the curved inner surface of the end of the flat plate portion 11 of the protective plate body 10 on the face C side.

[0031] The handle 30 is attached at a height that is easy for a worker S inside the skin-slip protective guard 100 to grasp with their own hands, for example, around waist height, or slightly above the upper edge of the side protective plate 20. The attachment position and number of handles 30 are not limited to those described above. The handle 30 may be made of metal or resin, and the method of attaching it to the protective cover body 10 is also not limited.

[0032] As described above, the protective guard 100 can be installed simply by having the lower end of the protective plate body 10 in contact with the floor surface A of the tunnel excavation surface and the upper end of the protective plate body 10 leaning against the side wall surface B of the tunnel excavation surface. Therefore, installation and relocation work is easy. In addition, the curved portion 12 of the protective plate body 10 makes it possible to protect workers S from soil and other debris falling from the side wall surface B or ceiling surface of the tunnel excavation surface.

[0033] Furthermore, if the protective plate body 10 and the side protective plates 20 are constructed by sandwiching a polystyrene foam plate between FRP plates on both sides and integrating them, the weight of the skin-slip protective guard 100 will be approximately 10-20 kg, allowing worker S to easily move it by himself.

[0034] It should be noted that the present invention is not limited to the skin-repellent protective guard 100 specifically described in the embodiments described above, and can be modified as appropriate within the scope described in the claims.

[0035] For example, although the skin-slip protection guard 100 has been described as having side protective plates 20, it may also be made without side protective plates 20. Also, although the case in which a handle 30 is provided on the protective plate body 10 has been described, the skin-slip protection guard 100 may not have a handle 30. Furthermore, the handle 30 may be provided on the upper part of the side protective plate 20 or elsewhere. [Explanation of symbols]

[0036] 10... Protective plate body, 11... Flat plate section (first protective plate), 12... Curved section (second protective plate), 20... Side protective plate (third protective plate), 30... Handle, 100... Skin fall protection guard, A... Bottom surface of tunnel excavation face, B... Side wall surface of tunnel excavation face, C... Face surface, S... Worker.

Claims

1. A protective guard for preventing skin from falling from the side walls and ceiling of the tunnel excavation face, and for protecting workers from skin from falling from the tunnel face, when constructing a mountain tunnel, The protective plate body comprises a rectangular flat section and a curved section that extends upward from the upper end of the flat section, and has a width exceeding the width of a human body; and a side protective plate made of a flat plate that is fixed to one of the side ends of the flat section from the lower end of the flat section up to a predetermined height, and extends from that side end in the direction in which the curved section curves. A skin fall protection guard is characterized in that the lower end of the flat portion of the protective plate body is placed in contact with the floor surface of the tunnel excavation surface, the upper end of the curved portion of the protective plate body is placed in contact with the side wall surface of the tunnel excavation surface, and the side protective plate is positioned on the face side, thereby protecting workers from skin fall while securing a working space between it and the side wall surface.

2. The protective guard according to claim 1, further comprising at least one handle provided on the inner surface of the protective plate body.

3. The protective guard according to claim 1 or 2, characterized in that the protective plate body and the side protective plate are each made of a foamed resin plate sandwiched between fiber-reinforced resin plates.

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