Rock fall prevention guard

Abstract

To provide a rock fall prevention guard capable of allowing a worker to visually check the state of the upper working face and the like.SOLUTION: A rock fall prevention guard 100 includes: multiple guard bodies 10 each having a frame body 11 having an opening 11a with a wire mesh 12 stretched; a connector 20 that connects the multiple guard bodies 19 in the transverse direction of a tunnel A; and an attachment 30 capable of attaching both ends of the multiple connected guard bodies 10 in the transverse direction of the tunnel A to a drilling rod 42 of two spaced apart guide shells 41 provided to a drill jumbo 40.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a skin-fall protection guard. [Background technology]

[0002] In mountain tunnel construction, the tunnel face is cut by blasting using explosives, and the resulting rubble (rock debris) is transported outside the tunnel to continue digging. The unstable tunnel excavation surface that was cut is reinforced by spraying concrete, etc., and then supports are installed and the concrete lining is applied.

[0003] Workers get close to the tunnel face when performing tasks such as loading explosives for blasting, removing loose rocks and boulders that have come loose on the tunnel excavation surface with iron bars, spraying concrete on the tunnel excavation surface, and erecting supports.

[0004] In such cases, rocks may fall from the face (rock fall), putting workers in danger. Conventionally, there have been devices that use shoring to protect workers from rock fall, but they do not exist before the shoring is installed. Therefore, before the shoring is installed, workers were protected by installing roof-like protective equipment on the drill jumbo, but there were issues with worker safety and the ease of handling due to the weight of the protective equipment.

[0005] Therefore, Patent Document 1 describes a protective body that uses shock absorbing materials to receive objects that fall from the drill face by fixing both ends of a holding member that holds multiple shock absorbing members on its upper surface to the guide shell of the drill jumbo. Here, the shock absorbing members are made of highly expanded polyethylene plate members covered with polyethylene film, and the holding members are made of polyester strip members. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7104383 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the protective body described in Patent Document 1, the holding member holding the multiple shock absorbing members on its upper surface is located above the worker, which causes a problem that the worker cannot visually check the condition of the face above.

[0008] In view of the above, an object of the present invention is to provide a skin-fall protection guard that allows workers to visually check the condition of the face above, etc. [Means for solving the problem]

[0009] The skin-fall protection guard of the present invention is characterized in that it comprises a plurality of guard bodies having a frame body with a wire mesh stretched over an opening, connecting devices that connect the plurality of guard bodies in the transverse direction of the tunnel, and mounting devices that can attach both ends of the connected plurality of guard bodies in the transverse direction of the tunnel to the drilling rods of two spaced-apart guide shells provided on a drill jumbo.

[0010] According to the skin fall protection guard of the present invention, the guard body is a frame body with a wire mesh stretched across the opening, so that, unlike the technology described in Patent Document 1 above, it is possible to visually observe the working face and other elements located above the worker from the working position through the wire mesh.

[0011] In the skin-fall protection guard of the present invention, it is preferable that the wire mesh is fixed to the frame by a coil-shaped metal wire wound around the frame.

[0012] In this case, the wire mesh can be easily fixed to the frame.

[0013] In addition, in the skin fall protection guard of the present invention, it is preferable that a connectable device having a ring-shaped portion is fixed to the frame body by the coil-shaped metal wire, and the ring-shaped portions of the connectable devices are connected to each other by the connecting device.

[0014] In this case, it is possible to easily connect and disconnect the guard body.

[0015] In addition, it is preferable that the skin-fall protection guard of the present invention is provided with a surrounding body that surrounds the outer peripheral surface of the drilling rod and to which the mounting device is fixed, and a fixing device that can be inserted through a through hole formed in the surrounding body and fixed with its tip pressed against the outer peripheral surface of the drilling rod.

[0016] In this case, by fixing the surrounding body to the drilling rod with a fastener, it is possible to prevent the mounting tool from shifting relative to the drilling rod. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic side view showing an installation state of the skin fall protection guard according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic top view seen from the direction of arrow A in FIG. 1. [Diagram 3] A schematic enlarged side view showing the state in which a mounting fixture with an anti-slip function is fixed to the tip of the drilling rod. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] A skin-fall protection guard 100 according to an embodiment of the present invention will be described with reference to the drawings. Note that the drawings are for explaining the present embodiment in a schematic manner, and the dimensions are exaggerated.

[0019] The skin fall protection guard 100 comprises a number of guard bodies 10 each having a frame body 11 with a wire mesh 12 stretched over an opening 11a, connecting devices 20 that connect the guard bodies 10 together in the transverse direction of the tunnel A (the X-axis direction in the figure), and mounting devices 30 that can attach both ends of the connected guard bodies 10 to the drilling rods 42 of two spaced-apart guide shells 41 provided on a drill jumbo 40.

[0020] The skin-fall protection guard 100, which is attached by the attachments 30 to two drilling rods 42 with both ends spaced apart from each other of the connected guard body 10, is positioned close to the face B of the tunnel A by positioning the tip of the drilling rod 42 close to the face B. As a result, falling rocks from the face B are received by the wire mesh 12, and the worker C working below the skin-fall protection guard 100 is protected.

[0021] The frame 11 is rectangular in top view with an opening 11a formed on the inside, and is composed of two horizontal frame parts 13 that extend in the transverse direction of the tunnel A (X-axis direction in the figure) and face each other, and two front and rear frame parts 14 that extend in the depth direction of the tunnel A (Y-axis direction in the figure) and face each other. These frame parts 13, 14 are each made of a steel pipe with a diameter of 20 mm, as an example. However, the frame parts 13, 14 are not limited to this, and may be square pipes, round bars, square bars, etc., or may be made of other metals such as aluminum alloys.

[0022] Here, the corners where the ends of the horizontal frame portion 13 and the front and rear frame portions 14 are close to each other are not fixed. However, these ends may be fixed by welding or the like. The frame body 11 is of a size that is easy for one worker C to handle, and as an example, the length in the X-axis direction is 1.5 m and the length in the Y-axis direction is 1.1 m.

[0023] Here, the wire mesh 12 is a diamond-shaped wire mesh, but it may also be a rectangular wire mesh or a tortoiseshell wire mesh. However, it is preferable that the gaps between the wires are relatively large so that the upper part can be seen through the gaps. As an example, the wire mesh 12 is a diamond-shaped wire mesh made of steel wires with a wire diameter of 3.2 mm and a center-to-center space of 50 mm x 50 mm. However, the wire mesh 12 is not limited to this, and may have other dimensions, or may be made of wires made of other metals such as stainless steel.

[0024] The wire mesh 12 is cut into a rectangular shape so that its outer shape matches the shape of the opening 11a of the frame body 11. A metal wire 15 is wound in a coil shape (spiral shape) around each of the frame parts 13, 14, and the frame parts 13, 14 and the wire mesh 12 are connected by this metal wire 15, so that the wire mesh 12 is stretched over the opening 11a of the frame body 11. Here, the metal wire 15 is wound around each of the frame parts 13, 14, but one metal wire 15 may be wound continuously around multiple frame parts 13, 14, or multiple metal wires 15 may be wound around one frame part 13, 14.

[0025] Furthermore, in addition to the wire mesh 12, the connectable devices 16 are also wound and fixed to the frame body 11 by metal wire 15. However, the connectable devices 16 may also be fixed to the frame body 11 by welding, bonding, fastening, etc. The connectable devices 16 here are members such as wires or metal fittings having annular parts such as eyes or rings at their ends, and the annular parts protrude to the outside of the frame body 11. Here, the four connectable devices 16 are fixed so that their annular parts protrude in the X-axis direction from both ends of the pair of horizontal frame parts 13. is.

[0026] Adjacent connectable devices 16 are connected via connectors 20, so that multiple guard bodies 10 are connected to extend in the X-axis direction. The connectors 20 are shackles. By using a shackle, connectable devices 16 having ring-shaped portions can be easily and reliably connected to each other. However, as the connectors 20, carabiners, ring catches, tie belts, etc. may also be used in place of shackles.

[0027] The number of connected guard bodies 10 may be determined according to the length in the X-axis direction of the tunnel A. Note that the lengths of the individual connected guard bodies 10 in the X-axis direction may be different.

[0028] A pair of mounting fixtures 30 are attached to both ends in the X-axis direction of the connected guard body 10. The mounting fixtures 30 are used to attach the skin-fall protection guard 100 to the drilling rod 42 of the guide shell 41 provided in the drill jumbo 40.

[0029] Here, the attachment 30 is a hook. This hook 30 is connected to the connected device 16 using a connecting device 20 and attached. As an example, the hook 30 has a ring-shaped portion formed at the base end, and the hook 30 and the guard body 10 are connected by hanging a shackle, which is the connecting device 20, between this ring-shaped portion and the ring-shaped portion of the connected device 16. However, instead of a hook, a shackle, a carabiner, or the like may also be used as the attachment 30.

[0030] Also, referring to FIG. 3, it is preferable to attach a mounting tool 50 with a slip-stop function to the drilling rod 42. The mounting tool 50 with a slip-stop function is composed of an enclosure 51 that surrounds the outer circumferential surface of the drilling rod 42, a hook 52 fixed to the enclosure 51, a bolt 53 with a handle that passes through a through hole formed in the rear part of the enclosure 51, and a nut 54 that screws into the bolt 53. The enclosure 51 may be made of a rigid body such as metal, plastic, or wood, or may be made of a strong cloth made of ballistic nylon (registered trademark) or aramid fiber Kevlar (registered trademark). A shackle, a carabiner, or the like may be used instead of the hook 52. The bolt 53 corresponds to the fixing tool of the present invention.

[0031] The attachment 50 with anti-slip function encloses the drill bit 42a at the tip of the drill rod 42 with the surrounding body 51, and fixes it with a nut 54 while pressing the tip of the bolt 53 against the inclined part 42b of the drill rod 42. In this way, the attachment 50 with anti-slip function is fixed to the tip of the drill rod 42, and the hook 52 is prevented from slipping.

[0032] In FIG. 3, the surrounding body 51 is only open at the rear (right side of the drawing), but it may also be open at the front (left side of the drawing). This makes it possible to attach a mounting fixture with a slip-prevention function to a part other than the tip of the drilling rod 42. In this case, the surrounding body may also be fixed to the front part using bolts and nuts in the same way as the rear part. Furthermore, the surrounding body 51 is not limited to one that surrounds the entire outer periphery of the drilling rod 42, but may also be one that partially surrounds it to the extent that it will not fall off.

[0033] The drill jumbo 40 comprises a self-propelled vehicle 43 that can be fixed in a predetermined position, at least two booms 44 that can freely rotate and extend in front of the vehicle 43, a guide shell 41 that is swingably attached to the tip of each of the two booms 44, a drifter (rock drill) 45 that advances and retreats while being guided by the guide shell 41, and a drilling rod 42 that is attached to the drifter 45 and drills holes in the rock. The drifter 45 uses the drilling rod 42 to drill holes in the rock face B for loading explosives.

[0034] The drill jumbo 40 may have a boom 44 to which, other than the drifter 45, for example, a concrete spraying device, a rock bolt driving device, a cage, etc. are attached. The drill jumbo 40 is not limited to being self-propelled, and may be one that runs guided by rails or one that is immobile.

[0035] The drill jumbo 10 is operated so that the drilling rods 42 extend in the Y-axis direction, spaced apart from each other in the X-axis direction, and the tip of each drilling rod 42 is located near the face B. This allows the skin-fall protection guard 100 to extend in the X-axis direction near the face B, and protect the worker C located below it from skin falls. The skin-fall protection guard 100 preferably extends over substantially the entire length of the tunnel A in the transverse direction, but is not limited to this and may extend only a portion of it. Furthermore, the height of the skin-fall protection guard 100 only needs to exceed at least the height of the worker C.

[0036] The skin-fall protection guard 100 is preferably stretched across so as to be flat in the horizontal direction. However, since the guard bodies 10 and the guard bodies 10 and the drilling rod 42 are connected to each other via the connectors 20 and the connection angle is not limited, the skin-fall protection guard 100 may be stretched across with a slight flexure.

[0037] It is preferable to operate the drill jumbo 10 so that the tip of each drilling rod 42 is pressed against the face B. It is also preferable to drill a small amount into the face B so that the tip of each drilling rod 42 is embedded in the face B. This provides stable support for the drilling rods 42 and suppresses bending, so that even if a skin fall occurs, the skin fall protection guard 100 can more reliably protect the worker C.

[0038] Next, a method for constructing the above-mentioned skin fall protection guard 100 will be described.

[0039] First, an appropriate number of guard bodies 10 are prepared. Next, the guard bodies 10 are connected using connectors 20. Next, both ends of the connected guard bodies 10 are attached to the drilling rods 42 of the guide shell 41 provided on the drill jumbo 10 using attachments 30. Note that after one end of each of the two guard bodies 10 is attached to the two spaced apart drilling rods 42 using the attachments 30, an appropriate number of guard bodies 10 may be connected between these guard bodies 10 using the connectors 20.

[0040] Next, with the two drilling rods 42 spaced apart in the X-axis direction and extending in the Y-axis direction, the two drilling rods 42 are extended or the drill jumbo 10 is made to travel toward the face B. Then, the tips of the drilling rods 42 are pressed against the face B. As a result, the skin-fall protection guard 100 is installed near the face B, extending in a direction transverse to the X-axis.

[0041] Furthermore, when removing the skin drop protection guard 100, after retracting the two drilling rods 42 or running the drill jumbo 10 away from the face B, the attachment by the mounting fixture 30 is released and the skin drop protection guard 100 is removed from the drilling rods 42.

[0042] In the above-mentioned skin fall protection guard 100, an appropriate number of guard bodies 11 are connected by connecting devices 20 and both ends are attached to the drilling rod 42 by mounting devices 30, making it possible to protect worker C working near the face B of tunnel A over the interval between the drilling rods 42.

[0043] Furthermore, the guard body 10 has a wire mesh 12 stretched across the opening 11a of the frame body 11. Unlike the protective body described in Patent Document 1 above, the working face B and other elements located above the worker C can be visually observed from the working position through the wire mesh 12, making it possible to predict danger.

[0044] Furthermore, since the worker C can carry each guard body 10 by himself, the worker C can install and remove the skin-fall protection guard 100 by himself. The guard body 10 is sturdy, with the wire mesh 12 stretched across the opening 11a of the frame body 11, so it is possible to reliably protect the worker from skin-falling. In addition, since all of the components that make up the skin-fall protection guard 100 can be commercially available products, the skin-fall protection guard 100 can be easily manufactured.

[0045] The present invention is not limited to the skin-fall protection guard 100 specifically described in the above embodiment, and may be modified as appropriate within the scope of the claims. For example, the guard body 10 may be connected in the Y-axis direction as well. [Explanation of symbols]

[0046] 10...guard body, 11...frame body, 11a...opening, 12...wire mesh, 13...horizontal frame section, 14...front and rear frame sections, 15...metal wire, 16...connected device, 20...connecting device, 30...mounting device, hook 40...drill jumbo, 41...guide shell, 42...drilling rod, 43...vehicle, 44...boom, 45...drifter, 50...mounting device with anti-slip function, 51...enclosure, 52...hook, mounting device, 53...bolt (fixing device), 54...nut, 100...skin fall protection guard, A...tunnel, B...face, C...worker.

Claims

1. A plurality of guard bodies each having a frame with a wire mesh stretched over an opening, and the plurality of guard bodies are connected to a tunnel A connecting tool for connecting the guard bodies in the transverse direction of the tunnel, and a connecting tool for connecting the guard bodies in the transverse direction of the tunnel The two ends of the drilling rod are attached to the two separate guide shells of the drill jumbo. The skin-fall protection guard is characterized by comprising an attachment tool capable of attaching each of the above-mentioned components.

2. The wire mesh is fixed to the frame by a coil-shaped metal wire wound around the frame. The skin fall protection guard according to claim 1, characterized in that

3. The coiled metal wire fixes a connecting member having a ring portion to the frame body, 3. The skin slip protection guard according to claim 2, wherein the annular portions of the connectable devices are connected to each other by the connecting device.

4. a surrounding body surrounding the outer peripheral surface of the drilling rod and to which the mounting tool is fixed; The rod can be fixed by inserting it through the formed through hole and pressing the tip against the outer circumferential surface of the drilling rod. The skin fall protection guard according to claim 1, further comprising a fixing device.

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