System for preventing airflow impact in goaf from harming production area

Abstract

The utility model discloses a system for preventing airflow impact of a goaf from harming a production area, which comprises curved wall plates and flow guide columns, the curved wall plates are symmetrically arranged on the left side and the right side of a roadway entering the goaf, and specified distances are reserved between the curved wall plates and the corresponding side walls of the roadway; one row of flow guide columns are arranged on the center face of the roadway in the width direction, and airflow in a goaf is divided into a left passage and a right passage by the flow guide columns when entering the roadway to decelerate and dissipate energy through the curved-surface wall plates; the cross section of each curved wall plate is zigzag, so that a plurality of communicated horn sections are formed between the curved wall plates on the two sides; the system further comprises a wind pressure sensor, a shielding door and an electric winch, the wind pressure sensor is arranged on the flow guide column farthest from the goaf, plane wall plates are arranged on the two sides, corresponding to the flow guide column, of the roadway respectively, a door frame is arranged between the plane wall plates, and the shielding door is installed in the door frame through a hinge with a torsional spring. The electric winch is installed on the curved wall plate closest to the high flow guide column, and a pull rope arranged on the electric winch pulls the shielding door to overcome the counter force of the torsional spring, so that the shielding door is kept in a normally-open state. And the shielding door is closed in case of special circumstances.

Description

Technical Field

[0001] The utility model belongs to the field of goaf area management, in particular to a system for preventing goaf area airflow impact from harming a production area. Background Art

[0002] Sealing is the simplest and most practical method to deal with underground goafs. The traditional method of sealing goafs is to build reinforced concrete retaining walls in the goaf-connected tunnels, using solid retaining walls to isolate the goafs to prevent the impact of air shock waves on the underground production area.

[0003] However, from the perspective of mine operation costs, solid walls have problems such as high cost, inconvenient drainage, and low sealing. In particular, the cost of retaining wall construction is often tens of thousands of yuan, and the relevant construction materials have caused permanent losses and cannot be reused. At the same time, after the retaining wall is formed, the goaf is sealed, causing the accumulated water in the goaf to be unable to be discharged in time, forming old hole water. The rock mass in the goaf is very easy to become unstable under the action of long-term immersion, which is a huge threat to mine safety production. Therefore, although the use of solid retaining walls to close the goaf can prevent impact hazards, it also derives the potential threat of water accumulation in the goaf and high operating costs, especially for mines with large water inflow or unstable rock mass, which may lead to increased water hazard pressure or increased blocking costs, causing great trouble to mine safety production and governance technology improvement. Utility Model Content

[0004] The utility model aims to provide a low-cost, high-safety system for preventing goaf airflow impact from harming production areas.

[0005] The system provided by the utility model for preventing airflow impact in goaf from harming production areas adopts the following technical solutions:

[0006] It includes curved wall panels and guide columns. The curved wall panels are symmetrically arranged on the left and right sides of the tunnel entering the goaf, and a specified distance is reserved between the curved wall panels and the corresponding side walls of the tunnel; a row of guide columns are arranged on the central plane of the tunnel in the width direction, and the airflow in the goaf is divided into two left and right paths by the guide columns when entering the tunnel, and the airflow passes through the curved wall panels to slow down and dissipate energy respectively; the cross-sectional shape of the curved wall panels is a sawtooth shape, so that a multi-section connected horn section is formed between the curved wall panels on both sides; the system also includes a wind pressure sensor, a shielding door and an electric winch, the wind pressure sensor is arranged on the guide column farthest from the goaf, flat wall panels are respectively arranged on both sides of the tunnel corresponding to the guide column, and a door frame is arranged between the flat wall panels, the shielding door is installed in the door frame through a hinge with a torsion spring, and the electric winch is installed on the curved wall panel closest to the high guide column, and the pull rope equipped with the electric winch pulls the shielding door to overcome the reaction force of the torsion spring, so that the shielding door remains in a normally open state.

[0007] When the above technical solution is implemented, the curved wall panel includes a Z-shaped unit body and a flat unit body, and the flat unit body can be detachably assembled between adjacent Z-shaped unit bodies.

[0008] When the above technical solution is implemented, the two sides of the Z-shaped unit body in the height direction are respectively assembled and positioned with the flat unit body through the plug-in structure, and the adjacent Z-shaped unit bodies and adjacent flat unit bodies in the height direction are respectively assembled and positioned through the plug-in structure.

[0009] When the above technical solution is implemented, the Z-shaped unit body array and the flat unit body array are connected respectively by plugging rods.

[0010] When the above technical solution is implemented, L-shaped slots for installing the plugging rod are respectively arranged on the backs of the Z-shaped unit body and the flat unit body.

[0011] When the above technical solution is implemented, the guide column is arranged near the large diameter end of each horn section, with the front end being an outward convex sharp corner and the rear end being an inward concave sharp corner.

[0012] When the above technical solution is implemented, the guide column includes a precast concrete block, a positioning column and a pressure plate. The precast concrete block is provided with a positioning column mounting groove extending from the inner concave corner to the front end. The two ends of the positioning column extend out of the precast concrete block respectively, and the pressure plate is connected to the upper protruding section of the positioning column.

[0013] When the above technical solution is implemented, the positioning column is a screw, and the pressure plate is threadedly connected to the positioning column.

[0014] The utility model arranges curved wall panels on both sides of the tunnel entering the goaf, and arranges a row of guide columns on the center plane of the tunnel in the width direction. When the impact airflow generated by the collapse of the goaf enters the tunnel, it is diverted by the guide columns of the first horn section to impact the curved wall panels on both sides, especially the transverse retaining edge of the curved wall panels. The transverse retaining edge consumes the kinetic energy of the impact airflow to slow it down, and makes the decelerated impact airflow reversely impact the rear end surface of the guide body to slow down again, and then enter the second horn section. By analogy, the energy consumption process in the subsequent horn sections is the same as the first horn section, so the velocity of the impact airflow after energy consumption in multiple horn sections is very small, and finally flows out from between the plane wall panels, and will not cause harm to the production area. In special circumstances, that is, when the wind pressure sensor on the last guide column detects that the pressure value of the airflow is greater than the set safety value and less than the withstand pressure value of the shielding door, the safety of the production area is guaranteed by closing the shielding door. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model (the plug-in structure and the plug-in rod are not shown).

[0016] Figure 2 for Figure 1A magnified schematic diagram of part A in FIG.

[0017] Figure 3 This is a schematic diagram of the guide column after assembly in this embodiment.

[0018] Figure 4 for Figure 1 An enlarged schematic diagram of part B in FIG.

[0019] Detailed serial numbers in the figure:

[0020] 1-Z-shaped unit body; 2-flat unit body;

[0021] 3-concrete precast block; 4-positioning column; 5-pressure plate;

[0022] 6-shield door; 7-ropes; 8-wire ropes;

[0023] 9-front partition; 10-rear partition;

[0024] 11- Flat siding. DETAILED DESCRIPTION

[0025] The utility model discloses a system for preventing air flow impact in goaf from endangering production areas, wherein curved wall panels symmetrical about guide columns are arranged on the left and right sides of a tunnel entering the goaf, and a specified spacing is reserved between the curved wall panels and the corresponding side walls of the tunnel; a row of guide columns are arranged on the center plane in the width direction of the tunnel; a wind pressure sensor is installed on the guide column farthest from the goaf, and a shielding door is arranged between the flat wall panels on the rear side of the guide column; under normal circumstances, the shielding door remains open; when the air flow in the goaf enters the tunnel, it is divided into two left and right passages by the guide column and dissipates energy through the curved wall panels respectively; when the wind pressure data fed back by the wind pressure sensor is greater than the set safety value and less than the withstand pressure value of the shielding door, the shielding door is closed.

[0026] In this embodiment, the cross-sectional shape of the curved wall panel is set to be a sawtooth shape, so that multiple sections of connected horn sections are formed between the curved wall panels on both sides, such as Figure 1 shown.

[0027] The curved wall panels are assembled and formed by units, including assembly along the length direction of the lane and assembly along the height direction of the lane, as follows:

[0028] The unit bodies of the curved wall panel include a Z-shaped unit body 1 and a flat unit body 2, which are formed by assembling in a prefabricated tunnel on the ground.

[0029] Along the length direction of the lane, the Z-shaped unit bodies 1 are arranged at a specified interval, and the flat unit bodies 2 are inserted between adjacent Z-shaped unit bodies 1.

[0030] Along the height direction of the tunnel, the upper and lower adjacent Z-shaped unit bodies 1 and the upper and lower adjacent flat plate unit bodies 2 are respectively assembled and positioned by means of plug-in structures.

[0031] In this embodiment, each unit body adopts a plug-in assembly structure of grooves and convex strips ( Figure 1 not shown).

[0032] In order to ensure the stability of the Z-shaped unit column and the flat unit column after assembly, the unit column is connected into a whole by a plug rod (not shown in the figure): a mounting groove for mounting the plug rod is set on the rear side of each unit body, and the mounting groove is L-shaped (the mounting groove is not shown in the figure). At the same time, in order to further improve the stability, a corresponding L-shaped groove is set on the bottom surface of the lane, and the lower end of the plug rod is inserted into the L-shaped groove on the bottom surface of the lane.

[0033] In this embodiment, the guide column is formed by prefabrication on the surface and then transported to the tunnel for assembly.

[0034] Each guide column includes a plurality of prefabricated concrete blocks 3 , positioning columns 4 and a pressure plate 5 .

[0035] The front end of the prefabricated concrete block 3 is an outward convex sharp corner, and the rear end is an inward concave sharp corner, and a U-shaped groove extending from the inward concave sharp corner to the front end is provided as a mounting groove for the positioning column.

[0036] The rear end width of the prefabricated concrete block 3 is greater than the width of the small cross section of each horn section, so that the prefabricated concrete block has the function of blocking flow and consuming energy.

[0037] The positioning column 4 is a screw rod, and the pressure plate 5 is a steel metal plate, which is threadedly connected to the top of the positioning column through its center hole. Each of the four prefabricated concrete blocks is assembled with the positioning column in sequence through the U-shaped groove.

[0038] A door frame is set at the corresponding shielding door 6 in the tunnel. The shielding door and the door frame are installed through a hinge with a torsion spring. The shielding door is pulled by a steel wire rope 8 configured by a rope wheel 7 of an electric winch installed on the curved wall panel to maintain a normally open state (the door frame is not shown in the figure).

[0039] Before assembling the various structures of the curved wall panels and guide columns in this embodiment, the bottom plate and top plate of the tunnel entering the goaf need to be leveled to ensure that the bottom plate and top plate of the tunnel are as flat as possible. During assembly, the front partition plates 9 are first installed symmetrically on both sides of the tunnel near the goaf, and then the curved wall panels are installed.

[0040] When installing the curved wall panel, first determine the position of the curved wall panel of the first horn section and install the first unit body in the height direction of the horn section wall panel: the flat unit body and the front partition are connected and fixed by bolts and nuts (bolts and nuts are not shown in the figure), and the flat unit body and the Z-shaped unit body are plugged and fixed;

[0041] Then, the curved wall panels of each horn section are installed in sequence along the length direction of the lane: the flat unit body is plugged and fixed with the Z-shaped unit body;

[0042] After the rear partition 10 is installed at the designated position, the plane wall plate 11 at the rear end is installed, and the rear partition and the plane wall plate are connected and fixed with bolts and nuts (bolts and nuts are not shown in the figure). At this point, the first segment body in the height direction is completely installed.

[0043] Next, refer to the above steps to install each section unit in the height direction in sequence; the upper end of the last section unit should be connected to the top plate of the tunnel as much as possible.

[0044] Finally, the plunger is installed at the L-shaped groove on the back of each flat unit column and the Z-shaped unit column, and the lower end of the plunger is inserted into the L-shaped groove on the bottom of the tunnel. The reserved spacing between the curved wall panel and the side wall of the tunnel is suitable for facilitating the installation of the plunger.

[0045] After the above installation is completed, a simple filling treatment can be carried out between the wall panel and the side wall of the tunnel using waste rocks etc. to enhance the stability of the wall panel.

[0046] Next, install the guide columns in sequence according to the designated positions.

[0047] During the specific installation, the pressure plate 5 is first connected to the upper part of the positioning column 4, and then the upper and lower ends of the positioning column are respectively inserted into the bottom plate and the top plate of the tunnel and fixed circumferentially;

[0048] From bottom to top, the prefabricated concrete blocks 3 are clamped onto the positioning columns 4 through the U-shaped grooves at their rear ends;

[0049] The pressing plate 5 is rotated to compress all the precast concrete blocks below it. When the precast concrete blocks are determined to be precast in height, it is necessary to ensure that the pressing plate is in contact with the top plate of the tunnel as much as possible after assembly.

[0050] After the guide column farthest from the goaf is assembled, a wind pressure sensor (not shown in the figure) is installed on it.

[0051] Next, a door frame is installed at a designated position between the plane wall panels 11, and the shield door 6 is installed in the door frame.

[0052] Next, an electric winch (whose motor has its own controller) is installed at a suitable height of the curved wall panel, and the shielding door is pulled with a steel wire rope configured by the electric winch. A pull ring can be provided on the back of the shielding door, and the steel wire rope is fixed on the pull ring to keep it open.

[0053] Finally, connect the data cable of the wind pressure sensor to the motor of the electric winch.

[0054] The working principle of this embodiment is as follows:

[0055] When the impact airflow generated by the collapse of the goaf enters the tunnel, it is diverted by the guide column of the first trumpet section to impact the curved wall panels on both sides, especially the lateral ribs of the Z-shaped unit body of the curved wall panels. The lateral ribs of the Z-shaped unit body consume the kinetic energy of the impact airflow to slow it down, and make the decelerated impact airflow reversely impact the rear end face of the guide body to slow down again, and then enter the second trumpet section. By analogy, the energy consumption process in the subsequent trumpet sections is the same as the first trumpet section, so the velocity of the impact airflow after energy consumption in multiple trumpet sections is very small, and finally flows out from between the flat wall panels, which will not cause harm to the production area.

[0056] Therefore, the number of horn sections of the curved wall panels is set based on the standard that the airflow flowing out from between the flat wall panels is below the set safety value. The wind pressure sensor set on the last guide column is used to monitor the safety of the airflow.

[0057] In special circumstances, that is, when the wind pressure sensor on the last guide column detects that the pressure value of the airflow is greater than the set safety value and less than the pressure resistance value of the shielding door, the motor of the electric winch drives the rope wheel to rotate and release the rope, thereby removing the restraint on the shielding door and closing the shielding door under the action of the torsion spring to ensure the safety of the production area.

Claims

1. A system for preventing airflow impact in goaf from harming production areas, characterized by: The system includes curved wall panels and guide columns. The curved wall panels are symmetrically arranged on the left and right sides of the tunnel entering the goaf, and a specified spacing is reserved between the curved wall panels and the corresponding side walls of the tunnel. A row of guide columns are arranged on the center plane of the tunnel in the width direction. When the airflow in the goaf enters the tunnel, it is divided into two left and right passages by the guide columns and decelerates and dissipates energy through the curved wall panels respectively. The cross-section of the curved wall panel is in a sawtooth shape, so that a plurality of interconnected horn sections are formed between the curved wall panels on both sides; The system also includes a wind pressure sensor, a shielding door and an electric winch. The wind pressure sensor is arranged on the guide column farthest from the goaf. Flat wall panels are arranged on both sides of the tunnel corresponding to the guide column. Door frames are arranged between the flat wall panels. The shielding door is installed in the door frame through a hinge with a torsion spring. The electric winch is installed on the curved wall panel closest to the high guide column. The pull rope equipped with the electric winch pulls the shielding door to overcome the reaction force of the torsion spring, so that the shielding door remains in a normally open state.

2. The system for preventing airflow impact in goaf from harming production areas as claimed in claim 1, characterized in that: The curved wall panel comprises a Z-shaped unit body and a flat unit body, and the flat unit body can be detachably assembled between adjacent Z-shaped unit bodies.

3. The system for preventing goaf airflow impact from harming production areas as claimed in claim 2, characterized in that: The two sides of the Z-shaped unit body in the height direction are respectively assembled and positioned with the flat plate unit body through plug-in structures, and the adjacent Z-shaped unit bodies and adjacent flat plate unit bodies in the height direction are respectively assembled and positioned through plug-in structures.

4. The system for preventing airflow impact in goaf from harming production areas as claimed in claim 3, characterized in that: The Z-shaped unit body array and the flat unit body array are connected by plugging rods respectively.

5. The system for preventing airflow impact in goaf from harming production areas as claimed in claim 4, characterized in that: The backs of the Z-shaped unit body and the flat unit body are respectively provided with L-shaped slots for installing the inserting rod.

6. The system for preventing airflow impact in goaf from harming production areas as claimed in claim 1, characterized in that: The guide column is arranged near the large diameter end of each horn section, with a front end being an outward convex sharp corner and a rear end being an inward concave sharp corner.

7. The system for preventing airflow impact in goaf from harming production areas as claimed in claim 6, characterized in that: The guide column includes a concrete precast block, a positioning column and a pressure plate. The concrete precast block is provided with a positioning column mounting groove extending from the inner concave corner to the front end. Both ends of the positioning column extend out of the concrete precast block respectively, and the pressure plate is connected to the upper extending section of the positioning column.

8. The system for preventing goaf airflow impact from harming production areas as claimed in claim 7, characterized in that: The positioning column is a screw rod, and the pressure plate is threadedly connected to the positioning column.

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