Overflow groove preparation method for downward drift filling method

Abstract

The invention discloses a preparation method of an overflow groove for a downward drift filling method, and belongs to the technical field of mining and filling. The applicator is provided with a rounded rectangular air bag, a rectangular connecting belt, an air passage and an electric air valve control. Firstly, air is input into the combined air bag through the electric air valve control, so that the combined air bag is inflated, and then the combined air bag is placed, the interlayer film is laid, the supporting steel mesh is erected and the stope is filled in sequence. And after the lower-layer stope is exposed, the combined air bag is exposed out of the top plate, then the remote control is controlled to open the electric air valve, the combined air bag exhaust contraction and recovery operation is completed, and preparation of the overflow groove and recovery of the combined air bag are achieved. The method has the advantages of high efficiency, low cost, high flexibility and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine filling in mining, and relates to a preparation method of a filling overflow trough, specifically to a preparation method of an overflow trough for the downward drift filling method. Background Art

[0002] At present, the filling mining method has achieved great development and wide application in the mining process. For the mining of underground metal / non-metal mines with high grade, high value, poor ore-rock stability and high in-situ stress, the downward slicing drift filling mining method is generally selected at present. In this filling mining method, the direct roof of the downward drift mining working face is the artificial false roof constructed by filling after the upper slicing drift mining is completed. Compared with the ore-rock roof with high stress, soft and broken, the artificial filling false roof can provide a safe and controllable stable roof for the mining operation of the lower slicing drift. The existing downward drift tailings filling construction has the disadvantages of insufficient roof contact during filling, single construction position of the overflow trough, slow construction progress, high cost and poor flexibility. Therefore, there is an urgent need to develop a low-cost and high-efficiency preparation method of the overflow trough.

[0003] The Chinese invention patent application with the publication number CN116241318A discloses "a downward drift tailings roof contact filling construction method using an artificial overflow trough", and its construction has an artificial overflow trough. The artificial overflow trough uses woven bags filled with crushed ore, and then uses woven bags to build a suitable cube on the bottom plate at a suitable position, and the outside is tightly wrapped with plastic film to solidify the inside to form an artificial overflow trough. By constructing the artificial overflow trough, the flatness of the filling surface can be improved, and the compressive strength of the filling surface can be increased. After the lower slicing stope is exposed, a filling pit is formed on the roof, which is convenient for hanging the filling pipeline during the lower slicing filling to ensure the roof contact of the downward filling stope. The main disadvantages of this artificial overflow trough are as follows: First, the woven bags filled with crushed ore have a high density and large weight, resulting in high construction cost and slow progress of the artificial overflow trough, and after the lower slicing stope is mined, the woven bags filled with crushed ore are easy to fall and cause potential safety hazards; Second, the reusable value of the woven bags filled with crushed ore as the construction tool of this artificial overflow trough is very low, mainly because there are sharp corners in the crushed ore, which are easy to scratch and damage the woven bags during their falling and handling processes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a preparation method of an overflow trough for the downward drift filling method, which has the characteristics of low construction cost, fast speed, strong flexibility, and the main body of the construction tool can be recycled.

[0005] The technical solution of the present invention is as follows: A preparation method of an overflow trough for the downward drift filling method includes the following steps: Step 1): Construct the steel frame net: Erect a horizontal steel frame net on the bottom plate of the access road, which is 20 - 30 cm higher than the bottom of the access road. Step 2): Construct the overflow trough tool: Step 2.1): Use an inflation device to inflate the gas into the combined airbag to make the combined airbag bulge. Step 2.2): Place the combined airbag at a preset position on the horizontally leveled bottom plate of the stope. Step 2.3): Lay a layer of isolation film to cover the top and sides of the combined airbag. Step 2.4): Construct a support steel net that encloses the combined airbag inside. The lower side of the support steel net is connected to the steel frame net, and there is a 20 - 30 cm gap between the support steel net and the combined airbag. Step 3): Stope filling: First, lay the filling pipeline, and then carry out stope filling. The filling body covers the combined airbag, the support steel net, and the steel frame net until the entire stope is filled. Step 4): Deflation operation: After the lower - level stope is exposed and the top plate reveals the combined airbag, then carry out the deflation operation of the combined airbag. Step 5): Recovery of the combined airbag: After the combined airbag deflates and shrinks, it drops to the lower - level stope and is recovered.

[0006] Preferably, the combined airbag includes four rounded - rectangle airbags with the same size after inflation and bulging. Two rounded - rectangle airbags are arranged side - by - side horizontally at the bottom layer, and the other two rounded - rectangle airbags are arranged side - by - side longitudinally at the upper layer. The height of the rounded - rectangle airbag is equal to the width and is half of the length. After combination, the front and rear end faces of the upper layer are flush with the front and rear side faces of the bottom layer, and the left and right side faces of the upper layer are flush with the left and right end faces of the bottom layer. Adjacent rounded - rectangle airbags are connected to each other through rectangular connection belts provided on the outer side or outer end face of the airbag. Adjacent rounded - rectangle airbags are connected through air channels. An electric air valve control is installed at the bottom of one of the rounded - rectangle airbags at the bottom layer.

[0007] Further preferably, the electric air valve control includes a protective shell. An electric air valve is arranged inside the protective shell, and a buffer body is arranged between the protective shell and the electric air valve. The protective shell is sealed and connected to the lower side wall of the rounded - rectangle airbag where it is located. The upper end of the electric air valve is located inside the cavity of the rounded - rectangle airbag where it is located, and the outer end is located below the rounded - rectangle airbag where it is located.

[0008] Even more preferably, the combined airbag further includes a remote control for controlling the opening of the electric air valve to realize the exhaust and contraction operation of the combined airbag.

[0009] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention stacks four airbags to form a combined airbag. After placing the combined airbag at the prefabricated position of the overflow tank, a plastic film is covered and a support steel mesh is erected. After completing the laying operation of the filling pipeline, stope filling is carried out, and the filling body wraps the combined airbag and fills the stope until it is full. After the lower-level stope is exposed, the combined airbag is exposed on the roof, and then the deflation operation of the combined airbag is carried out. After the combined airbag deflates and shrinks, it drops to the lower-level stope and is recycled. It has the prominent characteristics of low construction cost, simple preparation procedure of the construction tool, and flexible and fast assembly. Second, the combined airbag, which is the main part of the construction tool of the present invention, can be recycled, reducing the total cost of the filling operation. Third, during the construction of the present invention, there is a support steel mesh that covers the combined airbag inside and is connected to the steel frame mesh of the approach floor at the lower side, and the support steel mesh is spaced 20-30 cm from the combined airbag. After the filling operation is completed and the lower-level ore body is exposed, the support steel mesh is located inside the filling body, plays a supporting role for the overflow tank, and effectively improves the strength of the filling body. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the overflow tank construction tool in the embodiment of the present invention.

[0011] Figure 2 It is a schematic structural diagram of the combined airbag in the embodiment of the overflow tank construction tool of the present invention.

[0012] Figure 3 It is a schematic diagram of the airway connection relationship between the rounded rectangular airbags in the embodiment of the overflow tank construction tool of the present invention.

[0013] Figure 4 It is a schematic diagram of the installation position of the electric air valve control in the embodiment of the overflow tank construction tool of the present invention.

[0014] Figure 5 It is a schematic structural diagram of the electric air valve control in the embodiment of the overflow tank construction tool of the present invention.

[0015] In the figure: 1. Combined airbag, 11. Rounded rectangular airbag, 12. Rectangular connecting band, 13. Airway, 14. Electric air valve control, 141. Electric air valve, 142. Protective shell, 143. Buffer body, 2. Interlayer film, 3. Support steel mesh. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described below in conjunction with the embodiments and the drawings.

[0017] As Figure 1 shown, as a method for preparing an overflow tank for the downward drift filling method in an embodiment of the present invention, the specific steps are as follows.

[0018] Before installing the overflow tank construction tool, a steel frame mesh with a horizontal orientation and 25 cm higher than the approach floor is erected on the approach floor.

[0019] During the construction of the overflow chute implement, first, use an inflation device to fill the combined airbag 1 with gas so that the combined airbag 1 is fully inflated. Then place the combined airbag 1 at a preset position on the horizontally leveled ore room floor (when constructing the steel frame net, a space for the preset position of this combined airbag 1 needs to be reserved to facilitate the contact between the lower side of the combined airbag 1 and the drift floor). Lay a layer of spacer film 2 on the drift floor and make the spacer film 2 cover and wrap the top and four sides of the combined airbag 1. Construct a support steel net 3 that encloses the combined airbag 1 inside. The lower side of the support steel net 3 is connected to the steel frame net, and the support steel net 3 is spaced 25 cm from the combined airbag 1. After completing the remaining auxiliary operations (mainly laying the filling pipeline), carry out ore room filling. The filling body covers the combined airbag 1, the support steel net 3, and the steel frame net until the entire ore room is filled. After the lower-level stope is exposed, the combined airbag 1 is exposed on the roof, and then the deflation operation of the combined airbag 1 is carried out. After the combined airbag 1 deflates and shrinks, it drops to the lower-level stope and is recovered.

[0020] The function of the spacer film 2 is to prevent the filling body from adhering to the combined airbag 1. The main function of the support steel net 3 is to ensure that the support steel net 3 is located inside the filling body after the filling operation is completed and the lower-level ore body is exposed, play a supporting role for the overflow chute, and effectively improve the strength of the filling body.

[0021] As Figure 2 , the combined airbag 1 includes four rounded rectangular airbags 11 with the same size after inflation and bulging. Two of the rounded rectangular airbags 11 are arranged side by side horizontally at the bottom layer, and the other two rounded rectangular airbags 11 are arranged side by side longitudinally at the upper layer. The height of the rounded rectangular airbag 11 is equal to the width and equal to half of the length. After combination, the front and rear end faces of the upper layer are flush with the front and rear side faces of the bottom layer, and the left and right side faces of the upper layer are flush with the left and right end faces of the bottom layer. The outer wall surface in the length direction is called the side face, and the outer wall surface in the height or width direction is called the end face.

[0022] During actual production, the size of the rounded rectangular airbag 11 after inflation and bulging is .

[0023] Adjacent rounded rectangular airbags 11 are fixedly connected to each other through rectangular connecting bands 12 provided on the outer side face or outer end face of the airbag. Specifically, still as Figure 2, a rectangular connecting belt 12 is respectively connected between the front side of the bottom front rounded rectangular airbag 11 and the front end faces of the two upper rounded rectangular airbags 11. A rectangular connecting belt 12 is respectively connected between the right end faces of the two bottom rounded rectangular airbags 11 and the right side face of the right upper rounded rectangular airbag 11. A rectangular connecting belt 12 is respectively connected between the rear side of the bottom rear rounded rectangular airbag 11 and the rear end faces of the two upper rounded rectangular airbags 11. A rectangular connecting belt 12 is respectively connected between the left end faces of the two bottom rounded rectangular airbags 11 and the left side face of the left upper rounded rectangular airbag 11. Two rectangular connecting belts 12 are respectively connected between the upper side faces of the two upper rounded rectangular airbags 11 and between the lower side faces of the two bottom rounded rectangular airbags 11.

[0024] The adjacent rounded rectangular airbags 11 are communicated through an air duct 13. Specifically, as Figure 3 , the two upper rounded rectangular airbags 11, the two bottom rounded rectangular airbags 11, between the bottom front rounded rectangular airbag 11 and the two upper rounded rectangular airbags 11, and between the bottom rear rounded rectangular airbag 11 and the two upper rounded rectangular airbags 11 are respectively communicated through the air duct 13.

[0025] Such as Figure 4 , an electric air valve control 14 is installed at the bottom of one of the bottom rounded rectangular airbags 11. The electric air valve control 14 is used for the inflation operation of an external inflation device and the remote control deflation operation.

[0026] Such as Figure 5 , the electric air valve control 14 includes a protective shell 142, an electric air valve 141 is arranged inside the protective shell 142, and a buffer body 143 is arranged between the inner wall of the protective shell 142 and the electric air valve 141. Among them, the protective shell 142 is hermetically connected to the lower side wall of the rounded rectangular airbag 11 where it is located, and the electric air valve 141 is located on the central axis of the protective shell 142. The upper end of the electric air valve 141 is used as the air inlet and outlet and is located in the inner cavity of the rounded rectangular airbag 11 where it is located, and the outer end is used as the air inlet and outlet and is located below the rounded rectangular airbag 11 where it is located.

[0027] The buffer body 143 is a material such as foam plastic or bubble film filled between the protective shell 142 and the electric air valve 141.

[0028] The combined airbag 1 further includes a remote control for controlling the opening of the electric air valve 141 to realize the exhaust and contraction operation of the combined airbag 1. The remote control is omitted in the drawings.

[0029] The overflow groove applicator described in the present invention refers to a mold for constructing an overflow groove.

Claims

1. A method for preparing an overflow trough for a downward inlet filling method, characterized in that: The following steps are involved: Step 1) Construction of steel frame net: erect a layer of horizontal steel frame net on the bottom plate of the access road and 20-30cm higher than the bottom of the access road; Step 2) Construction of overflow trough tools: Step 2.1): using an inflation device to inflate the combined airbag (1) with gas, so that the combined airbag (1) is inflated; Step 2.2): placing the combined airbag (1) at a preset position on the horizontally flattened floor of the mine room; Step 2.3): laying a layer of interlayer film (2) so that the interlayer film (2) covers the top and sides of the combined airbag (1); Step 2.4): construct a supporting steel mesh (3) to cover the combined airbag (1) inside, the lower side of the supporting steel mesh (3) is connected to the steel frame mesh, and the supporting steel mesh (3) is spaced 20-30 cm from the combined airbag (1); Step 3), filling the mine room: firstly, the filling pipeline is laid, and then the mine room is filled, and the filling body covers the combined air bag (1), the supporting steel mesh (3) and the steel frame mesh until the entire mine room is filled; Step 4), deflation operation: after the lower layer stope is exposed, the roof exposes the combined air bag (1), and then the deflation operation of the combined air bag (1) is performed; Step 5), recovery of the combined airbag: after the combined airbag (1) is deflated and shrunk, it falls to the lower layer stope and is recovered.

2. The method for preparing an overflow trough for a downward inlet filling method according to claim 1, characterized in that: The combined airbag (1) comprises four rounded rectangular airbags (11) of the same size after being inflated, two of which are arranged side by side in a horizontal direction on the bottom layer, and the other two of which are arranged side by side in a vertical direction on the upper layer; the height of the rounded rectangular airbags (11) is equal to the width and equal to half of the length; after being combined, the front and rear end faces of the upper layer are flush with the front and rear side faces of the bottom layer, and the left and right side faces of the upper layer are flush with the left and right end faces of the bottom layer; adjacent rounded rectangular airbags (11) are connected to each other via rectangular connecting strips (12) arranged on the outer side faces or outer end faces of the airbags; adjacent rounded rectangular airbags (11) are connected via airways (13); and an electric air valve control (14) is installed at the bottom of one of the rounded rectangular airbags (11) on the bottom layer.

3. The method for preparing an overflow trough for a downward inlet filling method according to claim 2, characterized in that: The electric air valve control unit (14) comprises a protective shell (142), an electric air valve (141) is arranged inside the protective shell (142), and a buffer body (143) is arranged between the protective shell (142) and the electric air valve (141); the protective shell (142) is sealedly connected to the lower wall of the rounded rectangular air bag (11); the upper end of the electric air valve (141) is located in the inner cavity of the rounded rectangular air bag (11), and the outer end is located below the rounded rectangular air bag (11).

4. The method for preparing an overflow trough for a downward inlet filling method according to claim 3, characterized in that: The combined airbag (1) also includes a remote control unit for controlling the opening of the electric air valve (141) to achieve exhaust and contraction operations of the combined airbag (1).

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