JP2018104951A - Rockfall protective device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rockfall protective device that can be easily transferred and easily recover rock waste.SOLUTION: A rockfall protective device 1 of the present invention comprises: a plurality of suspending units 10 attached to support frames B of a belt conveyor; a plurality of slide units 20 slidably held in the longer direction of the belt conveyor by the plurality of suspending units 10; and protection units 30 attached to the lower part of the plurality of slide units 20. The protection units 30 are protruded close to the outside than both sides of a width direction of the belt conveyor in a plan view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rock fall protection device, and more particularly, to a mobile rock fall protection device that can be easily moved and can easily recover a slip.

In mountain tunnel construction, a continuous belt conveyor is increasingly used to transport gaps (stones and earth and sand) generated at the face to the outside of the mine. The belt conveyor is extended from the face to the outside of the mine, but it is usually installed by hanging it at a high place in the mine with a bracket or chain to avoid obstructing the passage of construction vehicles. (FIG. 5).
In the case of slippage by the belt conveyor, when the slip on the belt is conveyed, it may fall downward. For example, in the construction of a tunnel invert part, if a slip on the belt conveyor falls on a worker, a concrete placing surface, or an invert pier, there is a risk of causing great damage.

  In order to avoid such damage, conventionally, a protective net was hung on the lower part of the belt conveyor before and after the construction section of the tunnel invert work, thereby preventing the fall of the slip. Moreover, since the construction section moves to the face side as the construction progresses, the protection net has been moved accordingly.

However, the prior art has the following drawbacks.
<1> To move the protective net, remove two or three protective nets on the wellhead side using an aerial work vehicle, transport it about 80m across the Invert pier, and then lift it again. Deploy a protective net on the face side. For this reason, 2 to 3 hours are required for one transfer work, and work efficiency is very bad.
<2> The work of collecting the slip is apt to get tangled in the irregular net, and the work efficiency is very poor.
<3> A gap smaller than the mesh of the net passes through the mesh and falls under the net.

  An object of the present invention is to provide a rock fall protection device that solves these problems of the prior art.

  A rock fall protection device according to the present invention for solving the above-described problems includes a plurality of suspension units attached to a support frame of the belt conveyor, and a plurality of suspension units slidably held in the longitudinal direction of the belt conveyor. A plurality of slide units and a protection unit attached to the lower part of the plurality of slide units, and the protection unit projects outward from both sides in the width direction of the belt conveyor in a plan view.

  In the rock fall protection device of the present invention, the protection unit may be a face material.

  In the rock fall protection device of the present invention, the face material may be a resin cardboard board, and the line direction of the resin cardboard board may be substantially orthogonal to the extending direction of the belt conveyor.

  The rock fall protection device of the present invention is a suspension device in which a suspension unit is attached to a support frame of a belt conveyor, a lower bracket that holds a slide unit, and a lower bracket is suspended from the upper bracket in a swingable manner. And may be provided.

  In the rock fall protection device of the present invention, the suspension unit includes a roller, the slide unit includes a long slide rail, and the slide unit is configured to be slidable in the longitudinal direction of the belt conveyor by contact with the roller. Good.

  In the rock fall protection device of the present invention, the suspension unit may include two rollers, the slide rail may have a diamond shape in cross section, and the two rollers may be in contact with two adjacent surfaces below the slide rail.

Since the rock fall protection device of the present invention has the above configuration, it has at least one of the following effects.
<1> Since the slide can be smoothly moved along the support rail of the belt conveyor, the transfer is easy and the work efficiency is good.
<2> Since the protection unit is a face material, the slip can be efficiently recovered by sweeping the protection unit with a flat rake.
<3> Since the protection unit is a face material, it is possible to supplement fine leaks without leaking.

Explanatory drawing of the rock fall protection apparatus which concerns on this invention. Explanatory drawing of a suspension unit. Explanatory drawing of a slide structure. Explanatory drawing of the usage method of the rock fall protection apparatus which concerns on this invention. Explanatory drawing of background art.

Hereinafter, the rock fall protection device of the present invention will be described in detail with reference to the drawings.
In this specification and the like, the directions such as “front / rear”, “left / right”, and “up / down” are directions in which the longitudinal direction of the belt conveyor is front and rear and the width direction is left and right in a state where the falling rock protection device is attached to the belt conveyor. means.

[Falling rock protection device]
<1> Overall configuration (FIG. 1).
The rock fall protection device 1 of the present invention is a device for protecting workers, equipment, and the like below the belt conveyor A from a slip spilled from the belt conveyor A installed in a tunnel mine.
The rock fall protection device 1 of the present invention includes a plurality of suspension units 10, a plurality of slide units 20, and a protection unit 30.
In this example, a combination of eight suspension units 10, two slide units 20, and two protection units 30 is employed. The two slide units 20 are arranged in parallel in the left-right direction, four suspension units 10 are arranged along the longitudinal direction of each slide unit 20, and the two protection units 30 are connected in the front-rear direction.
In FIG. 1, the structure of the rock fall protection device 1 is easily understood. A part of the support frame B of the belt conveyor A is indicated by a transmission line.

<2> Suspension unit (FIG. 2).
The suspension unit 10 is a member that holds the slide unit 20 slidably in the longitudinal direction of the belt conveyor A. Two or more suspension units 10 are provided for one slide unit 20.
In this example, as the suspension unit 10, the upper bracket 11 attached to the support frame B of the belt conveyor A, the lower bracket 13 holding the slide unit 20, and the lower bracket 13 are suspended from the upper bracket 11 in a swingable manner. A suspension member that includes a suspension frame 12 and a roller 14 that is rotatably attached to the lower bracket 13 is employed.
In addition, the structure of the suspension unit 10 is not restricted to this. In short, any structure may be used as long as the plurality of suspension units 10 can hold the slide unit 20 slidably with respect to the support frame B.

<2.1> Upper bracket.
The upper bracket 11 is a member for hanging on the support rail B.
In this example, an inverted U-shaped member having an opening that can be fitted onto the support rail B is employed below.
In the vicinity of both lower ends of the upper bracket 11, insertion holes for inserting the suspension tool 12 are formed.

<2.2> Lower bracket.
The lower bracket 13 is a member for holding the slide rail 21.
In this example, an inverted U-shaped member having a slide space S in which the slide rail 21 can be held is employed.
A roller 14 is rotatably supported at both lower ends of the lower bracket 13.
In the upper part of the lower bracket 13, two insertion holes for inserting the suspension tool 12 are formed.

<2.3> Hanging frame.
The suspension tool 12 is a member that suspends the lower bracket 13 from the upper bracket 11 so as to be swingable.
In this example, two carabiners are employed as the hanging frame 12. A carabiner is an annular metal member having an opening / closing part (gate).
Since the carabiner can be removed simply by pushing the gate open with a finger, the suspension unit 10 can be easily installed and removed.

<3> Slide unit (FIG. 3).
The slide unit 20 is a member that is held in the slide space S of the plurality of suspension units 10 and slides the protection unit 30.
In this example, a total of two slide units 20 are provided along the left and right support rails B of the belt conveyor A.
The slide unit 20 employs a rail member that includes a long slide rail 21 and a plurality of couplers 22 connected below the slide rail 21.
In this example, a square steel pipe is employed for the slide rail 21.
The connecting tool 22 protrudes from the lower side in the direction in which the front view of the slide rail 21 has a rhombus shape at regular intervals in the longitudinal direction of the slide rail 21.
The connector 22 is composed of a reverse T-shaped member in front view and a flat plate member corresponding to the upper side of the T-shape, and a bolt can be fastened by sandwiching a protective surface material 31 of the protective unit 30 described later from above and below. Configure.
Note that the configuration of the slide unit 20 is not limited to this, and various other configurations may be employed. For example, the slide rail 21 may have a circular cross section or a triangle. Further, it may be made of FRP (fiber reinforced plastic).

<3.1> Slide structure (FIG. 3).
The rock fall protection device 1 of the present invention is characterized by a slide structure that can move along the longitudinal direction of the belt conveyor A by holding the slide unit 20 slidably by the suspension unit 10.
In this example, the lower part of the slide space S of the suspension unit 10 is configured in a shape corresponding to the lower shape of the slide rail 21 by the two rollers 14.
Specifically, the rollers 14 are installed facing each other so that the rotation axes of the two rollers 14 form an intersection angle θ downward. In this example, the intersection angle θ is 90 degrees (FIG. 2).
In this example, since the side surfaces of the two rollers 14 are in contact with the two adjacent side surfaces on the lower side of the slide rail 21 respectively, the load can be effectively distributed and supported.
Further, since the support frame B is suspended from the well wall, it may be slightly bent or deformed due to the load or vibration of the belt conveyor A.
On the other hand, in this example, since the upper bracket 11 and the lower bracket 13 are not fixedly connected but are connected by the suspension 12 while allowing a slight swing, the support rail B is distorted. Even if it exists, the displacement by distortion can be absorbed.
With the above structure, the rock fall protection device 1 of the present invention can smoothly slide along the belt conveyor A.

<4> Protection unit.
The protection unit 30 is a member that prevents a slip spilled from the belt conveyor A from falling downward.
The width of the protection unit 30 is wider than the width of the belt conveyor A. That is, the protection unit 30 projects outward from both sides in the width direction of the belt conveyor A in plan view.
In this example, the protection unit 30 includes a protection surface material 31 and a side wall 32 that is formed at the edge of the protection surface material 31 and prevents slipping out.
As the protective face material 31, a resin cardboard board known by a trademark such as “Pradan” is employed. In order to prevent bending, the resin corrugated board is arranged in a direction in which the line direction is substantially perpendicular to the width direction of the protection unit 30, that is, the extending direction of the belt conveyor A.
The protective face material 31 may be one piece or a plurality of pieces may be connected.
The side wall 32 is not an essential component. Further, the side walls 32 may be provided at the front and rear ends in addition to the both ends of the protective face material 31. Or you may provide only in the end of the tunnel center side.

<4.1> Function of protection unit.
Conventionally, since the gap was manually removed from the net deformed by the load of the fallen gap, the work efficiency was poor, and the gap was likely to get tangled in the net.
On the other hand, since the face material is employed for the protection unit 30 in this example, it is easy to collect the slip. For example, it is possible to collect easily and cleanly by sweeping the gap on the protective surface material 31 with a register mark.
Moreover, since it is a planar body, even a small gap can be recovered without leakage.

<5> How to use the rock fall protection device (FIG. 4).
The rock fall protection device of the present invention is used in the following procedure.
A plurality of suspension units 10 are attached to the two lower rails of the support frame B that supports the belt conveyor A at predetermined intervals.
Specifically, the upper bracket 11 is externally fitted to the upper part of the support frame B, and the lower bracket 13 is connected by inserting the suspension tool 12 into the insertion hole at the lower part of the upper bracket 11.
Subsequently, the slide rail 21 of the slide unit 20 is communicated with the slide space S of the plurality of suspension units 10.
The rock fall protection device 1 of the present invention can be easily moved by pulling or pushing along the belt conveyor A when the construction of one work section of the tunnel invert portion is completed and the construction location moves, for example. This eliminates the need for work with aerial work platforms.
In addition, the rock fall protection device 1 of the present invention is not limited to the protection of the tunnel invert part, but can be used for appropriate applications over the range in which the belt conveyor A extends.

[Other examples of slide structure]
The slide structure of the suspension unit 10 and the slide unit 20 is not limited to the configuration of the first embodiment.
For example, a rail-like member may be fixed to the lower part of the plurality of suspension units 10 along the longitudinal direction of the belt conveyor A, and the upper part of the slide unit 20 may be a roller-like member instead of the slide rail 21.
In this case, the roller member of the slide unit 20 can be slidably brought into contact with the peripheral surface of the rail member of the suspension unit 10 to be slid along the longitudinal direction of the belt conveyor A.

DESCRIPTION OF SYMBOLS 1 Falling rock protective device 10 Suspension unit 11 Upper bracket 12 Suspension bracket 13 Lower bracket 14 Roller 20 Slide unit 21 Slide rail 22 Connecting tool 30 Protection unit 31 Protection surface material 32 Side wall A Belt conveyor B Support frame S Slide space θ Intersection angle

Claims (6)

A rock fall protection device for protecting the lower part from a slippage spilled from a belt conveyor installed in a tunnel mine,
A plurality of suspension units attached to the support frame of the belt conveyor;
A plurality of slide units that are slidably held in the longitudinal direction of the belt conveyor by the plurality of suspension units;
A protection unit attached to the lower part of the plurality of slide units,
The protective unit is projected outward from both sides in the width direction of the belt conveyor in plan view,
Rock fall protection device.   The rock fall protection device according to claim 1, wherein the protection unit is a face material.   The rock fall protection device according to claim 2, wherein the face material is a resin corrugated cardboard, and a line direction of the resin corrugated cardboard is substantially orthogonal to an extending direction of the belt conveyor.   The suspension unit includes an upper bracket that can be attached to a support frame of a belt conveyor, a lower bracket that holds the slide unit, and a suspension tool that suspends the lower bracket from the upper bracket so as to be swingable. The rock fall protection device according to any one of claims 1 to 3, wherein the rock fall protection device is provided.   The suspension unit includes a roller, the slide unit includes a long slide rail, and the slide unit is configured to be slidable in the longitudinal direction of the belt conveyor by contact with the roller. The rock fall protection device according to any one of claims 1 to 4.   6. The suspension unit according to claim 5, wherein the suspension unit includes two rollers, the slide rail has a rhombus shape in cross section, and the two rollers contact two adjacent surfaces below the slide rail. Rock fall protection device.

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