Top contact method for paste filling of underground goaf chamber

Abstract

The invention relates to an underground goaf chamber paste filling roof contact method, and relates to the technical field of mining filling. According to the underground goaf chamber paste filling roof contact method, the air bag is hung at the position below the top in the goaf chamber, the air bag is uniformly aerated by controlling the pressure regulating device, and the paste around the air bag is extruded upwards along with the air-entrapping expansion of the air bag, so that the paste is upwards contacted with the roof; meanwhile, the air bag is connected with the pressure adjusting device, inflation can be conducted through the pressure adjusting device, meanwhile, the air pressure gauge monitors the air pressure in the air bag in real time, safety and stability in the inflation process are ensured, and the pressure adjusting valve is used for adjusting the air pressure of the air bag to prevent over-inflation or insufficient inflation.

Description

Technical Field

[0001] The present application relates to the field of mine mining and filling technology, and in particular to a method for filling and connecting the top of a mine room in an underground goaf with paste. Background Art

[0002] During the mining process, the promotion and application of paste filling technology provides a strong guarantee for the personal safety of underground mine workers.

[0003] The filling and roof connection effect of the mine room is related to the safe production efficiency of the underground mining area. If the filling and roof connection effect is poor, it will take production time to supplement or remediate on site, affecting the production cycle and consuming costs. At the same time, it will also cause the filling body to have no support for the upper layer paste or surrounding rock roof, and there is a risk of collapse of the upper layer, threatening the safety of on-site production personnel.

[0004] At present, the commonly used method to improve the paste filling and roof connection of the mine room in the goaf area is mainly carried out from the mine room structure, partition wall production and pipeline layout. However, in the actual construction process, there is still a situation where the filling is not completely connected to the roof, and the filling and roof connection effect of the mine room is poor. Summary of the Invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a method for filling and connecting the roof of a mine room in an underground goaf with paste, which can effectively ensure the filling and connecting effect of the mine room.

[0006] The present application provides a method for filling and capping a goaf in an underground mine with paste, the method comprising: Step 1: Hang the uninflated air bag on the top of the mine room in the goaf to be filled; Step 2: Build a partition wall at the mine room in the goaf to be filled, and connect the airbag inflation line to the pressure regulating device outside the partition wall. The partition wall is a closed partition wall, and is provided with an airbag recovery hole pipe, a filling pipe, and an exhaust pipe. The pressure regulating device includes: an air pump, a pressure regulating valve, and a pressure gauge, which are used to inflate the airbag and regulate the air pressure; Step 3: The prepared filling paste is transported to the mine chamber in the goaf to be filled through the filling pipe, and the filling is stopped after the filling reaches the top of the mine chamber; Step 4: After the filling is stopped for at least one hour, when the paste in the mine room stops flowing and the paste self-sinks and shrinks, and before the paste initially solidifies, the air bag is filled with air by controlling the pressure regulating device. After the air bag is filled with air and expanded, the paste around the air bag is squeezed upward to connect with the top; Step 5: After the filling paste in the mine room is completely solidified, control the pressure regulating device to release the gas. After the gas is completely released from the air bag, recover the air bag in the mine room through the air bag recovery hole pipe to complete the filling and roof connection work of the goaf mine room.

[0007] Optionally, in some embodiments of the present application: Suspend the uninflated airbag at the top of the mined-out area to be backfilled, which specifically includes: Make hanging rings with ropes or wires, and use a U-shaped hanging form to suspend the airbag at a position below the top inside the mined-out area; After the airbag is suspended, lead the air line of the airbag outside the partition wall and connect it to the pressure regulating device. Among them, the air pump, pressure regulating valve, pressure gauge, and the air line of the airbag are sequentially connected through pipelines.

[0008] Optionally, in some embodiments of the present application: Inflate the airbag by controlling the pressure regulating device, which specifically includes: Set the maximum pressure value through the pressure regulating valve, and this maximum pressure value is within the safe value range of the pressure that the airbag can withstand; Control the air pump to inflate evenly. When the value on the pressure gauge reaches the predetermined air pressure value of the airbag or when slurry paste flows out of the hole at the top of the exhaust pipe, control the air pump to stop inflating the airbag.

[0009] Optionally, in some embodiments of the present application: Inflate the airbag by controlling the pressure regulating device, which specifically includes: Before inflating the airbag, conduct non-hermetic plugging on the exhaust pipe, and leave a gap at the top of the exhaust pipe to discharge the gas in the mined-out area while meeting the airbag inflation requirements.

[0010] Optionally, in some embodiments of the present application: Construct a partition wall at the mined-out area to be backfilled, which specifically includes: When constructing the partition wall, embed and install an airbag recovery hole pipe at the position of the partition wall corresponding to the airbag for later recovery of the airbag in the mined-out area; After the partition wall is poured and hardened, put the recovery hole pipe airbag into the airbag recovery hole pipe and inflate it. After the recovery hole pipe airbag inflates and bulges, block the airbag recovery hole pipe to prevent the paste from flowing out during backfilling.

[0011] Optionally, in some embodiments of the present application: Construct a partition wall at the mined-out area to be backfilled, which specifically includes: When constructing the partition wall, embed and install a filling pipe at the top position of the partition wall. After the partition wall is poured and hardened, connect the filling pipe to the paste delivery pipe of the filling preparation station through a pipeline for paste filling; When constructing the partition wall, embed and install an exhaust pipe at the top position of the partition wall for exhausting during the partition wall filling construction.

[0012] Optionally, in some embodiments of the present application: A partition wall should be made at the stope of the goaf to be backfilled, specifically including: A material level observation pipe is arranged on the partition wall. When making the partition wall, the material level observation pipe is embedded and installed at the side wall position of the partition wall to observe the paste filling situation in the stope.

[0013] Optionally, in some embodiments of the present application: The installation height of the material level observation pipe is calculated according to the size of the goaf and the amount of paste in the pipeline from the ground surface to the backfill pipe of the goaf. The volume of the goaf space above the central height position of the material level observation pipe is approximately equal to the total amount of paste in the pipeline of the backfill pipe.

[0014] Optionally, in some embodiments of the present application: The prepared filling paste is transported to the stope of the goaf to be backfilled through the backfill pipe, specifically including: Transport the paste prepared by the filling preparation station to the stope of the goaf. After observing the incoming material through the material level observation pipe on the partition wall, block the observation pipe, control the filling preparation station to stop preparing the paste and wash the pipe with water, and continue to fill the paste in the underground backfill pipe into the stope of the goaf; After observing the incoming material through the intake pipe on the partition wall, turn the gate valve of the filling preparation station to the sedimentation tank and close the gate valve on the top backfill pipe of the partition wall to prevent the paste in the stope from flowing back into the backfill pipe.

[0015] Optionally, in some embodiments of the present application: The airbag is made of rubber material. The cross-sectional shape of the airbag is circular. The airbag interface is a pagoda head. The air valve port is fixed with a nut. The air line connected to the air valve port is connected to a tee. Among them: one connection is to a pressure gauge, and the other connection is successively connected to a valve switch, a pressure regulating valve and an air pump.

[0016] The technical solution provided by the present application may include the following beneficial effects: In the present application, the airbag is suspended at a position below the top inside the stope of the goaf, and the airbag is evenly inflated by controlling the pressure regulating device. As the airbag inflates and expands, the paste around the airbag is squeezed upward, so that the paste is in contact with the top upward; at the same time, by connecting the airbag with the pressure regulating device, the airbag can be inflated through the pressure regulating device. At the same time, the pressure gauge real-time monitors the air pressure in the airbag to ensure the safety and stability during the inflation process. The pressure regulating valve is used to adjust the air pressure of the airbag to prevent over-inflation or under-inflation.

[0017] This application can control the volume of the airbag after inflation by setting a preset air pressure value of the airbag, so that the expansion volume of the airbag in the mine room is limited, ensuring that the paste in the mine room can effectively complete the top connection. At the same time, before the pressure gauge reaches the preset air pressure value, by observing whether there is slurry paste flowing out of the hole at the top of the exhaust pipe, it can avoid excessive inflation and damage of the airbag, thereby ensuring safety during the inflation process.

[0018] The present application sets up a material level observation tube, which enables construction personnel to monitor the filling status of the paste in the mine room in real time. At the same time, by installing the material level observation tube at a designed height, the preparation amount of the paste can be better controlled so that the prepared paste amount matches the paste amount in the mine room, which can avoid waste during the paste filling process and improve the economic benefits of the filling construction.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0021] Figure 1 This is a structural diagram of a method for filling and capping a goaf chamber with paste in an embodiment of the present application; Figure 2 This is a structural diagram of the mine room filling and roof connection in the embodiment of the present application; Figure 3 This is a structural diagram of a mine room in an embodiment of the present application; Figure 4 This is a structural diagram of a hanging ring hoisting airbag in an embodiment of the present application; Figure 5 This is a front view structural diagram of a partition wall in an embodiment of the present application; Figure 6 It is a side view structural diagram of the partition wall in the embodiment of the present application.

[0022] Figure numerals: 1-unconnected area of the mine room; 2-slurry paste; 3-air bag; 4-topped area of the paste after aeration; 5-air bag recovery hole pipe; 6-recovery hole pipe air bag; 7-partition wall; 8-mine room in the goaf; 9-exhaust pipe; 10-material level observation tube; 11-filling pipe; 12-hanging ring. DETAILED DESCRIPTION

[0023] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0026] Unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] The filling and roof contact effect of the stope is related to the safety production efficiency of the underground mining area stope. If the filling and roof contact effect is poor, it will take production time to supplement or rectify on site, which will affect the production cycle and consume costs. At the same time, it will also cause the filling body to have no support for the paste or surrounding rock roof of the upper layer, resulting in the risk of collapse of the upper layer and threatening the safety of on-site production personnel.

[0028] At present, the commonly used methods for improving the paste filling and roof contact in mined-out rooms mainly focus on the room structure, partition wall fabrication, and pipeline layout. However, during actual construction, there are still cases where the filling does not fully contact the roof, resulting in poor filling and roof contact effects in the mined-out rooms.

[0029] In view of the above problems, an embodiment of the present application provides a method for paste filling and roof contact in underground mined-out rooms, which can effectively ensure the filling and roof contact effect of the mined-out rooms.

[0030] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] Figure 1 is a schematic structural diagram of the method for paste filling and roof contact in underground mined-out rooms in an embodiment of the present application; Figure 2 is a schematic structural diagram of the filling and roof contact of a mined-out room in an embodiment of the present application; Figure 3 is a schematic structural diagram of a mined-out room in an embodiment of the present application; Figure 4 is a schematic structural diagram of a hanging ring hoisting airbag in an embodiment of the present application; Figure 5 is a front view structural diagram of a partition wall in an embodiment of the present application; Figure 6 is a side view structural diagram of a partition wall in an embodiment of the present application.

[0032] See Figure 1 , a method for paste filling and roof contact in underground mined-out rooms, the method comprising: S100: Step 1: Suspend the uninflated airbag 3 at the top of the mined-out room 8 to be filled.

[0033] Specifically, make a hanging ring 12 with iron wire and use a U-shaped hanging form to suspend the airbag 3 at a position below the top inside the mined-out room 8. It can be understood that the hanging ring 12 can also be made with a rope.

[0034] In this embodiment, by making the hanging ring 12 to suspend the airbag 3 at the top inside the mined-out room 8, the installation method is simple, the construction is convenient, and it is beneficial to the later recovery of the airbag 3, improving the construction efficiency.

[0035] S200: Step 2: Make a partition wall 7 at the mined-out room 8 to be filled and connect the inflation line of the airbag 3 to the pressure regulating device outside the partition wall 7. Among them, the partition wall 7 is a sealed partition wall 7, and an airbag recovery hole pipe 5, a filling pipe 11, and an exhaust pipe 9 are provided on the partition wall 7. The pressure regulating device includes: an air pump, a pressure regulating valve, and a pressure gauge, which are used to inflate the airbag 3 and adjust the air pressure.

[0036] Among them, the partition wall 7 is completed by means of concrete pouring construction.

[0037] Specifically, the partition wall 7 is made at the mined - out area room 8 to be backfilled, which specifically includes: When making the partition wall 7, an airbag recovery hole pipe 5 is embedded and installed at the position of the partition wall 7 corresponding to the airbag 3 for later recovery of the airbag 3 in the room; after the partition wall 7 is poured and hardened, a recovery hole pipe airbag 6 is placed into the airbag recovery hole pipe 5 and inflated. After the recovery hole pipe airbag 6 is inflated, the airbag recovery hole pipe 5 is blocked to prevent the paste from flowing out during backfilling.

[0038] In this embodiment, embedding and installing the airbag recovery hole pipe 5 at the position of the partition wall 7 corresponding to the airbag 3 can facilitate the later recovery of the airbag 3. At the same time, by setting the recovery hole pipe airbag 6, the airbag recovery hole pipe 5 can be effectively blocked, ensuring the normal backfilling of the paste in the room and the safety of the backfilling process.

[0039] Specifically, the partition wall 7 is made at the mined - out area room 8 to be backfilled, which specifically includes: When making the partition wall 7, a filling pipe 11 is embedded and installed at the top position of the partition wall 7. After the partition wall 7 is poured and hardened, the filling pipe 11 is connected to the paste conveying pipe of the filling preparation station through a pipeline for paste filling.

[0040] When making the partition wall 7, an exhaust pipe 9 is embedded and installed at the top position of the partition wall 7 for exhausting air during the filling construction of the partition wall 7.

[0041] In this embodiment, by connecting the filling pipe 11 to the paste conveying pipe of the filling preparation station through a pipeline, it is ensured that the filling paste can be smoothly transported into the room; by embedding and installing the exhaust pipe 9, the air in the room can be discharged in time during the filling process, ensuring the normal progress of the paste filling construction.

[0042] Specifically, the partition wall 7 is made at the mined - out area room 8 to be backfilled, which specifically includes: A material level observation pipe 10 is provided on the partition wall 7. When making the partition wall 7, the material level observation pipe 10 is embedded and installed at the side wall position of the partition wall 7 for observing the paste filling situation in the room.

[0043] Specifically, the installation height of the material level observation pipe 10 is calculated according to the size of the goaf and the amount of paste in the pipeline of the filling pipe 11 from the ground to the mined - out area. The volume of the goaf space above the center height position of the material level observation pipe 10 is approximately equal to the total amount of paste in the pipeline of the filling pipe 11.

[0044] In this embodiment, the installation of the material level observation pipe 10 enables construction workers to monitor the filling situation of paste in the ore chamber in real time. At the same time, by installing the material level observation pipe 10 at the designed height, the preparation quantity of the paste can be better controlled, so that the quantity of the prepared paste matches the quantity of the paste in the ore chamber, which can avoid waste during the paste filling process and improve the economic benefits of the filling construction.

[0045] Specifically, after the airbag 3 is suspended, lead the air line of the airbag 3 outside the partition wall 7 and connect it to the pressure regulating device. Among them, the air pump, pressure regulating valve, pressure gauge and the air line of the airbag 3 are connected in sequence through pipelines.

[0046] Specifically, the airbag 3 is made of rubber. The cross-sectional shape of the airbag 3 is circular. The interface of the airbag 3 is a tapered head. The air valve port is fixed with a nut. Connect the air line of the air valve port to a tee. Among them: one connection is to the pressure gauge, and the other connection is connected to the valve switch, pressure regulating valve and air pump in sequence. Among them, the valve switch is used to control the connection between the airbag 3 and the air pump.

[0047] In this embodiment, by using a rubber material airbag 3, the rubber material has good elasticity and toughness, and can maintain a certain shape even when subjected to external pressure after inflation, which is beneficial to squeezing the paste to contact the roof; at the same time, by connecting the airbag 3 to the pressure regulating device, it can be inflated through the pressure regulating device, and the air pressure in the airbag 3 can be monitored in real time through the pressure gauge to ensure the safety and stability during the inflation process. The pressure regulating valve is used to adjust and limit the air pressure of the airbag 3 to prevent over-inflation.

[0048] S300: Step 3: Transport the prepared filling paste to the ore chamber 8 of the goaf to be filled through the filling pipe 11, and stop filling after filling to the top of the ore chamber.

[0049] Specifically, transporting the prepared filling paste to the ore chamber 8 of the goaf to be filled through the filling pipe 11 specifically includes: Transport the paste prepared by the filling preparation station to the ore chamber 8 of the goaf. After observing the incoming material through the material level observation pipe 10 of the partition wall 7, block the observation pipe, and control the filling preparation station to stop preparing the paste and wash the pipe with water, and continue to fill the paste in the underground filling pipe 11 into the ore chamber 8 of the goaf; After observing the incoming material through the air inlet pipe of the partition wall 7, turn the gate valve of the filling preparation station to the sedimentation tank, and close the gate valve on the filling pipe 11 at the top of the partition wall 7 to avoid the backflow of the paste in the ore chamber into the filling pipe 11.

[0050] In this embodiment, during the filling process, the operator can observe the material level observation tube 10 in a timely manner to adjust the preparation and transportation of the paste, better control the amount of paste prepared, make the amount of prepared paste match the amount of paste in the ore chamber, avoid waste during the paste filling process, effectively reduce the construction cost, improve the economic benefits of the filling construction. At the same time, it reduces the risks of overflow and backflow that may occur during the filling process and improves the safety of the filling construction.

[0051] S400: Step 4: After waiting for at least one hour since the filling stops, when the paste in the ore chamber has no flow, the paste self-settles and shrinks, and before the paste initial sets, the airbag 3 is inflated by controlling the pressure regulating device. After the airbag 3 is inflated and expands, the paste around the airbag 3 is squeezed upwards to contact the roof.

[0052] In this embodiment, waiting for at least 1 hour is determined according to the fluidity, bleeding property, initial setting time and self-settling and shrinking property of the paste. After waiting for one hour since the filling stops, it can ensure that the paste in the ore chamber has no flow, the paste self-settles and shrinks, and the paste initial sets, so as to ensure the contact effect of the paste contacting the roof when the airbag 3 is inflated subsequently.

[0053] Specifically, the inflation of the airbag 3 by controlling the pressure regulating device specifically includes: Before inflating the airbag 3, the exhaust pipe 9 is non-hermetically blocked, and a gap is reserved at the top of the exhaust pipe 9 to discharge the gas in the ore chamber and meet the inflation requirements of the airbag 3 at the same time.

[0054] In this embodiment, by using a sealing plate with holes at the top to non-hermetically block the exhaust pipe 9, it can meet the passing of the air line of the airbag 3. The air line of the airbag 3 is led outside the partition wall 7 through the exhaust pipe 9 and connected to the pressure regulating device, and can ensure the normal discharge of the gas in the ore chamber.

[0055] Specifically, the inflation of the airbag 3 by controlling the pressure regulating device specifically includes: Set the maximum pressure value through the pressure regulating valve, and this maximum pressure value is within the safe value range of the pressure that the airbag 3 can withstand; Control the air pump to inflate evenly. When the value on the pressure gauge reaches the predetermined pressure value of the airbag 3 or when the slurry paste 2 flows out of the hole at the top of the exhaust pipe 9, control the air pump to stop inflating the airbag 3.

[0056] In this embodiment, by setting the maximum pressure value of the pressure regulating valve, it is ensured that the airbag 3 will not be damaged due to excessive pressure during the inflation process.

[0057] In this embodiment, the air pressure regulating device is controlled to evenly fill the airbag 3. As the airbag 3 expands during inflation, the paste around the airbag 3 is squeezed upward, causing the paste to reach the roof. Specifically, during the process of filling the airbag 3 with air, according to the volume of the stope and the volume of the self-settling and shrinking of the paste in the stope, the preset air pressure value of the airbag 3 is set to control the volume of the airbag 3 after inflation. After the air pressure gauge reaches the preset air pressure value, the expansion volume of the airbag 3 in the stope is limited, and it can ensure that the paste in the stope completes the roof contact. At the same time, if the air pressure gauge has not reached the preset air pressure value, but it is observed that the slurry paste 2 flows out of the hole at the top of the exhaust pipe 9, it means that the paste in the stope has completed the roof contact at this time, and it is necessary to immediately control the air pump to stop filling the airbag 3 with air to avoid damage to the airbag 3 due to over-inflation.

[0058] Step 5: After the filling paste in the stope is completely solidified, control the air pressure regulating device to deflate. After all the gas is released from the airbag 3, recover the airbag 3 in the stope through the airbag recovery hole pipe 5 to complete the paste filling and roof contact work for the mined-out stope 8.

[0059] In this embodiment, after the filling paste in the stope is completely solidified, the completely solidified paste can provide effective support for the roof of the stope, ensuring the structural stability and safety of the stope. At the same time, by controlling the air pressure regulating device to deflate the airbag 3 and removing the recovery hole pipe airbag 6 on the airbag recovery hole pipe 5, the deflated airbag 3 is taken out from the recovery hole pipe airbag 6 to complete the recovery of the airbag 3 for subsequent stope filling and roof contact construction, reducing the construction cost.

[0060] The technical solutions provided by the embodiments of the present application include the following beneficial effects: In the present application, the airbag is suspended at a position below the top inside the mined-out stope, and the air pressure regulating device is controlled to evenly fill the airbag with air. As the airbag expands during inflation, the paste around the airbag is squeezed upward, causing the paste to reach the roof. At the same time, by connecting the airbag to the air pressure regulating device, the airbag can be inflated through the air pressure regulating device. At the same time, the air pressure gauge monitors the air pressure in the airbag in real time to ensure the safety and stability during the inflation process. The pressure regulating valve is used to adjust the air pressure of the airbag to prevent over-inflation or under-inflation.

[0061] In the present application, by setting the preset air pressure value of the airbag, the volume of the airbag after inflation can be controlled, so that the expansion volume of the airbag in the stope is limited, ensuring that the paste in the stope can effectively complete the roof contact. At the same time, before the air pressure gauge reaches the preset air pressure value, by observing whether the slurry paste flows out of the hole at the top of the exhaust pipe, it can avoid damage to the airbag due to over-inflation and ensure the safety during the inflation process.

[0062] This application is provided with a material level observation tube, which enables construction workers to monitor the filling situation of paste in the ore chamber in real time. At the same time, by installing the material level observation tube at the designed height, the preparation amount of paste can be better controlled, so that the amount of prepared paste matches the amount of paste in the ore chamber, which can avoid waste during the paste filling process and improve the economic benefits of the filling construction.

[0063] Finally, it should also be noted that in this text, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art of this technology without departing from the scope and spirit of the described embodiments. The choice of terms used in this text is intended to best explain the principles of the embodiments, practical applications or improvements to the technology in the market, or to enable other ordinary technicians in the art of this technology to understand the embodiments disclosed in this text.

Claims

1. A method for roof contact of paste filling in underground mined - out stope rooms, characterized in that The method includes the following steps: Step 1: Suspend the uninflated airbag at the top of the mined-out area ore room to be backfilled; Step 2: Construct a partition wall at the mined-out area ore room to be backfilled, and connect the inflation line of the airbag to the pressure regulating device outside the partition wall. The partition wall is an airtight partition wall, and an airbag recovery hole pipe, a filling pipe, and an exhaust pipe are arranged on the partition wall. The pressure regulating device includes an air pump, a pressure regulating valve, and a pressure gauge, which are used for inflating the airbag and regulating the air pressure; Step 3: Transport the prepared filling paste through the filling pipe to the mined-out area ore room to be backfilled, and stop filling after filling to the top of the ore room; Step 4: At least one hour after stopping filling, when the paste in the ore room has no flow and the paste self-settles and shrinks and before the paste initializes, control the pressure regulating device to add gas to the airbag. After the airbag expands by adding gas, the paste around the airbag is squeezed upward to contact the top; Step 5: After the filling paste in the ore room is completely solidified, control the pressure regulating device to deflate. After all the gas is released from the airbag, recover the airbag in the ore room through the airbag recovery hole pipe to complete the paste filling and roof contact work for the mined-out area ore room.

2. The method for paste filling and roof contact of the underground mined-out area ore room according to claim 1, wherein: The step of suspending the uninflated airbag at the top of the mined-out area ore room to be backfilled specifically includes: Make a hanging ring using a rope or wire, and suspend the airbag at a position below the top inside the mined-out area ore room in a U-shaped hanging form; After the airbag is suspended, lead the air line of the airbag outside the partition wall and connect it to the pressure regulating device. The air pump, the pressure regulating valve, the pressure gauge, and the air line of the airbag are sequentially connected through pipelines.

3. The method for paste filling and roof contact of the underground mined-out area ore room according to claim 2, wherein: The step of controlling the pressure regulating device to add gas to the airbag specifically includes: Set the maximum pressure value through the pressure regulating valve, and the maximum pressure value is within the safe value range of the pressure that the airbag can withstand; Control the air pump to add gas evenly. When the value on the pressure gauge reaches the predetermined air pressure value of the airbag or when slurry paste flows out of the hole at the top of the exhaust pipe, control the air pump to stop adding gas to the airbag.

4. The method for paste filling and roof contact of the underground mined-out area ore room according to claim 3, wherein: The step of controlling the pressure regulating device to add gas to the airbag specifically includes: Before adding gas to the airbag, conduct non-airtight plugging on the exhaust pipe, and leave a gap at the top of the exhaust pipe to discharge the gas in the ore room and at the same time meet the gas addition requirements of the airbag.

5. The method for paste filling and roof contact of the underground mined-out area ore room according to claim 4, wherein: The step of constructing a partition wall at the mined-out area ore room to be backfilled specifically includes: When constructing the partition wall, embed and install the airbag recovery hole pipe at the position of the partition wall corresponding to the airbag for later recovery of the airbag in the ore room; After the partition wall is poured and hardened, put the recovery hole pipe airbag into the airbag recovery hole pipe and add gas. After the recovery hole pipe airbag expands and bulges, block the airbag recovery hole pipe to prevent the paste from flowing out during filling.

6. The method for paste filling and roof contact of the underground mined-out area ore room according to any one of claims 1-5, wherein: Making a partition wall at the mined - out stope to be backfilled specifically includes: When making the partition wall, an injection pipe is embedded and installed at the top position of the partition wall. After the partition wall is poured and hardened, the injection pipe is connected to the paste delivery pipe of the paste preparation station through a pipeline for paste filling. When making the partition wall, an exhaust pipe is embedded and installed at the top position of the partition wall for exhausting during the filling construction of the partition wall.

7. The method for paste filling and roof caving in an underground mined - out stope according to claim 6, characterized in that: Making a partition wall at the mined - out stope to be backfilled specifically includes: A material level observation pipe is arranged on the partition wall. When making the partition wall, the material level observation pipe is embedded and installed at the side wall position of the partition wall to observe the paste filling situation in the stope.

8. The method for paste filling and roof caving in an underground mined - out stope according to claim 7, characterized in that: The installation height of the material level observation pipe is calculated according to the size of the mined - out area and the amount of paste in the pipeline from the ground to the injection pipe in the mined - out area. The volume of the mined - out area space above the center height position of the material level observation pipe is equal to the total amount of paste in the pipeline of the injection pipe.

9. The method for paste filling and roof caving in an underground mined - out stope according to claim 8, characterized in that: Conveying the prepared filling paste to the mined - out stope to be backfilled through the injection pipe specifically includes: Conveying the paste prepared by the paste preparation station to the mined - out stope. After the material arrival is observed through the material level observation pipe on the partition wall, the observation pipe is blocked, and the paste preparation station is controlled to stop preparing paste and wash the pipe with water, and the paste in the underground injection pipe is continuously filled into the mined - out stope. After the material arrival is observed through the air inlet pipe on the partition wall, the gate valve of the paste preparation station is switched to the sedimentation tank, and the gate valve on the injection pipe at the top of the partition wall is closed to prevent the paste in the stope from flowing back into the injection pipe.

10. The method for paste filling and roof caving in an underground mined - out stope according to claim 9, characterized in that: The airbag is made of rubber. The cross - sectional shape of the airbag is circular. The airbag interface is a pagoda head. The air valve port is fixed with a nut. The air line connected to the air valve port is connected to a tee. Among them: one connection is to a pressure gauge, and the other connection is successively connected to a valve switch, a pressure regulating valve and an air pump.

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