A kind of gangue retaining device for coal mine gob retaining lane and its use method

Abstract

The invention discloses a rock-blocking support device for gob-retaining lanes along coal mines and a method for using the device. The device comprises a rock-blocking mechanism, a top sealing mechanism and a bottom fixing mechanism. The rock-blocking mechanism is a prefabricated plate body, a top mounting head is provided at the top, a side mounting groove is provided at one end face of the rock-blocking mechanism, and a side mounting head is provided at the other end face matching the side mounting groove; the top sealing mechanism comprises a top mounting bar, the length of which is equivalent to the length of the rock-blocking mechanism, a top mounting groove is provided at the bottom of the top mounting bar matching the top mounting head, and a top sealing bar is fixedly provided at the top of the top mounting bar; the bottom fixing mechanism is respectively arranged at the two ends of the bottom end of the stop bar mechanism, the top of which matches the rock-blocking mechanism to provide a bottom mounting groove, and the bottom mounting groove runs through the bottom fixing mechanism. The invention can optimize the rock-blocking support process, reduce the labor intensity of workers, improve the quality of rock-blocking support and the effect of grouting, effectively prevent air leakage to the goaf, and realize the standardization of rock-blocking support.

Description

Technical Field

[0001] The invention belongs to the field of coal mine support, and in particular relates to a gangue retaining support device for gob-side lane retaining in coal mines and a use method thereof. Background Art

[0002] In order to eliminate coal pillars in coal mine sections, improve resource utilization, avoid the impact of stress concentration caused by coal pillars on the mining of underlying coal seams, shorten the time for forming coal mining faces, and ensure normal mining and excavation succession, the technology of retaining lanes along the goaf has received widespread attention in the coal mining industry. With the promotion of the "110 method", the lane retaining method with top cutting and pressure relief as the key technology has been widely used.

[0003] As one of the key technologies for cutting the top and retaining the lane, the commonly used method on site is to use "wire mesh + air duct cloth + steel mesh" in combination with single columns or I-beams for rock retaining support, and then spray the lane to seal the goaf. However, when the goaf collapses, the rock retaining support will be squeezed laterally. Because the wire mesh and steel mesh have a certain toughness, and the bottom is not fixed, and they are completely supported by I-beams or single columns, when squeezed, the wire mesh and steel mesh will deform into the lane, resulting in insufficient lane width, and the air duct cloth may be scratched by the gangue or the sprayed grout body may crack and fall off, affecting the sealing effect of the goaf. And every time the rock retaining support is carried out, the wire mesh, air duct cloth, and steel mesh need to be pre-bound and assembled with wire, which is cumbersome and requires a lot of manpower. Summary of the invention

[0004] The purpose of the present invention is to provide a gangue retaining support device for coal mine goaf-side tunnel retention and a method of using the device, by which the gangue retaining support process can be optimized, the labor intensity of workers can be reduced, the quality of gangue retaining support and the effect of grouting can be improved, air leakage into the goaf can be effectively prevented, and the standardization of gangue retaining support can be achieved.

[0005] The technical solution adopted by the present invention is a gangue retaining support device for goaf-side lane retaining in coal mines. When the goaf-side lane retaining is carried out by cutting the top and unloading the pressure, the gangue retaining support device cooperates with I-beams or single hydraulic props to support the goaf side. The gangue retaining support device comprises:

[0006] The rock retaining mechanism is a prefabricated plate body, the top end of which is provided with a top mounting head along the length direction, one end face of the rock retaining mechanism is provided with a side mounting groove along the length direction, and the other end face is provided with a side mounting head matching the side mounting groove;

[0007] The top sealing mechanism includes a top mounting bar, the length of which is equivalent to that of the rock retaining mechanism, a top mounting groove is formed at the bottom of the top mounting bar to match the top mounting head, and a top sealing bar is fixedly arranged at the top of the top mounting bar along the length direction;

[0008] The bottom fixing mechanism is respectively arranged at the two ends of the bottom end of the shift lever mechanism, and the top thereof matches the rock blocking mechanism to open a bottom mounting groove, and the bottom mounting groove runs through the bottom fixing mechanism.

[0009] Furthermore, the rock retaining mechanism is provided with a fixing nut and a connecting nut on one side of the side mounting groove and the side mounting head respectively. The fixing nut and the connecting nut are arranged at a predetermined distance along the height direction of the shifting rod mechanism and correspond one to one, and a bolt is provided to match the connecting nut.

[0010] Furthermore, the interior of the fixing nut is a smooth surface, and its inner diameter is larger than the diameter of the bolt. The connecting nut is provided with an internal thread, and the thread size matches the thread size of the bolt.

[0011] Furthermore, the height of the rock-blocking mechanism matches the top cutting height, the width matches the shifting step of the hydraulic support of the mining face, and one side of the rock-blocking mechanism is a smooth surface, and the other side is a rough surface.

[0012] Furthermore, the top mounting head is in a quadrangular pyramid structure, and the top area of ​​the top mounting head is larger than the bottom area.

[0013] Furthermore, the top sealing strip is preferably made of sealing rubber with compression properties.

[0014] Furthermore, the side mounting groove is a groove with a rectangular cross-section, and the side mounting head is a rectangular parallelepiped structure matching the side mounting groove.

[0015] Furthermore, a side sealing strip is provided in the side mounting groove.

[0016] Furthermore, the width of the bottom mounting groove matches the thickness of the rock retaining mechanism, and its depth is 5-8 cm.

[0017] A method for using a gangue retaining and supporting device for a goaf-side tunnel in a coal mine comprises the following steps:

[0018] Step 1: Dig a mounting hole in advance on the bottom plate of the designed rock retaining support device location for installing the bottom fixing mechanism. Set up several bottom fixing mechanisms according to the site needs. When installing the bottom fixing mechanism, make the bottom mounting groove direction parallel to the roadway orientation, and make the bottom of the bottom mounting groove flush with the roadway bottom plate. Every two adjacent rock retaining mechanisms share one bottom fixing mechanism.

[0019] Step 2: Push the top installation groove into the top installation head of the rock retaining mechanism from one side to complete the installation connection between the top sealing mechanism and the rock retaining mechanism;

[0020] Step 3: Make the smooth surface of the stopper mechanism face the goaf side and the rough surface face the roadway side, extend the upper part of the rock retaining mechanism into the goaf side of the top cutting line by a predetermined height, the extension height being greater than the depth of the bottom installation groove, and then put the bottom of the rock retaining mechanism into the bottom installation groove, and the top sealing mechanism should be completely located in the goaf above the top cutting line;

[0021] Step 4: After installing a piece of rock retaining support device, an I-beam or a single hydraulic support is installed on the side of the rock retaining support device close to the roadway. At this time, the installation of the first rock retaining support device is completed;

[0022] Step 5. Repeat steps 1 to 3 to install the second rock retaining support device, adjust the height of the second rock retaining mechanism, insert the side mounting head of the second rock retaining mechanism into the side mounting groove of the first rock retaining mechanism, and insert the provided bolts into the connecting nuts on the second rock retaining mechanism and the fixing nuts on the first rock retaining mechanism in sequence, and finally tighten all the bolts to complete the fixation between the two rock retaining mechanisms, and then install I-beams or single hydraulic struts, and repeat the installation of the remaining rock retaining support devices in this way.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention is used in conjunction with an I-beam or a single column, can withstand a certain lateral pressure, improves the quality of the gangue retaining support, and ensures the effect of retaining the lane. The top of the gangue retaining mechanism is provided with a top sealing mechanism to reduce air leakage from the lane to the goaf. The lower part is installed through a bottom fixing mechanism, which can further prevent the gangue retaining mechanism from being squeezed by the gangue in the goaf and tilting into the lane. Through the use of the gangue retaining mechanism, the standardization of the gangue retaining support can be achieved;

[0025] 2) The rock retaining mechanisms are connected by mounting grooves and fastened by bolts, which makes the installation process simple, convenient for workers to operate, and reduces the labor intensity of workers;

[0026] 3) By setting two different nuts, the fixed nut has a smooth surface inside and an inner diameter larger than the bolt diameter, when bolts are used to fasten adjacent rock retaining mechanisms, a certain angle can be formed between the two rock retaining mechanisms when they are connected, so that the rock retaining mechanisms can adapt to changes in the slope of the roadway;

[0027] 4) The height of the rock-blocking mechanism matches the top cutting height, and the width matches the hydraulic support frame moving step of the mining face, which can adapt to different roadway retention heights. The rock-blocking mechanism has a rough surface on the side of the roadway, which is conducive to the adhesion of slurry and further consolidates the anti-air leakage effect;

[0028] 5) The top sealing mechanism and the gangue retaining mechanism are connected by a four-sided pyramid structure mounting head and a mounting groove, which is easy to install and has high connection stability. The top sealing strip adopts a sealing rubber with compression performance, which can better fit the surface of the gangue on the top cutting line;

[0029] 6) The rock retaining mechanisms are connected through side mounting grooves and side mounting heads and fastened with bolts, which ensures the connection strength of the two rock retaining mechanisms. A sealing strip is provided in the side mounting groove to prevent air leakage into the goaf through the connection;

[0030] 7) The bottom mounting mechanism is matched with the rock retaining mechanism to set a mounting groove, which is convenient for fixing the bottom of the rock retaining mechanism. By adjusting the installation hole depth of the bottom mounting mechanism, the rock retaining mechanism can adapt to the change of the roadway slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is an enlarged view of the local figure A;

[0033] Figure 3 It is an enlarged view of the partial figure B;

[0034] Figure 4 It is a structural schematic diagram of the bottom fixing seat of the present invention;

[0035] Figure 5 It is the installation schematic diagram of the present invention;

[0036] Figure 6 It is a schematic diagram of the use of the present invention;

[0037] Markings in the figure: 1. gear lever mechanism, 101. top mounting head, 102. side mounting groove, 103. side mounting head, 104. fixing nut, 105. connecting nut, 106. bolt, 2. top sealing mechanism, 201. top mounting strip, 202. top mounting groove, 203. top sealing strip, 3. bottom fixing seat, 301. bottom mounting groove, 4. I-beam. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1-6 A gangue retaining support device for coal mine goaf-side lane retention and a method of using the device are used in conjunction with an I-beam 4 or a single hydraulic support. The gangue retaining support device includes a retaining rod mechanism 1, a top sealing mechanism 2 and a bottom fixing mechanism 3.

[0040] The rock retaining mechanism 1 is a prefabricated plate body, the height of which matches the top cutting height and can also be spliced, and the width matches the step arrangement of the hydraulic support moving frame of the mining face, and can adapt to different retaining heights; and the rock retaining mechanism 1 has a smooth surface on one side and a rough surface on the other side. During installation, the smooth surface faces the goaf side and the rough surface faces the tunnel side. When the tunnel is sprayed, the rough surface is conducive to the adhesion of the slurry.

[0041] A top mounting head 101 is provided at the top of the rock retaining mechanism 1 along the length direction. The top mounting head 101 is a quadrangular pyramid structure, and the top area of ​​the top mounting head 101 is larger than the bottom area, which is convenient for installation and has high connection stability; a side mounting groove 102 is provided on the end face of one side of the rock retaining mechanism 1 along the length direction, and a side mounting head 103 is provided on the end face of the other side to match the side mounting groove 102. Specifically, the side mounting groove 103 is a rectangular cross-section groove, and the side mounting head 103 is a rectangular parallelepiped structure matching the side mounting groove 102, which is convenient for two adjacent rock retaining mechanisms 1 to be connected through the side mounting groove 102 and the side mounting head 103. A side sealing strip is provided in the side mounting groove 102 to prevent air leakage into the goaf through the connection.

[0042] Furthermore, the rock retaining mechanism 1 is provided with a fixing nut 104 and a connecting nut 105 on one side of the side mounting groove 102 and the side mounting head 103, respectively. The fixing nut 104 and the connecting nut 105 are arranged at a predetermined distance along the height direction of the shifting rod mechanism 1 and correspond one to one, and the matching connecting nut 105 is provided with a bolt 106 for fastening the two rock retaining mechanisms 1 connected by the side mounting groove 102 and the side mounting head 103, thereby ensuring the connection strength of the two rock retaining mechanisms 1.

[0043] The interior of the fixing nut 104 is a smooth surface, and its inner diameter is larger than the diameter of the bolt 106. The connecting nut 105 is provided with an internal thread, and the thread size matches the thread size of the bolt 106. While satisfying the requirement of a tight connection, the fixing nut 104 with a smooth interior and a large inner diameter can allow the two rock retaining mechanisms 1 to have a certain angle when connected, and can achieve small angle adjustment when the heights of the two blocking rod mechanisms 1 are different, so that the rock retaining mechanism 1 can adapt to changes in the slope of the tunnel.

[0044] The top sealing mechanism 2 includes a top mounting strip 201 and a top sealing strip 203. The length of the top mounting strip 201 is comparable to that of the gangue retaining mechanism 1. The lower part of the top mounting strip 201 matches the top mounting head 101 to open a top mounting groove 202 for connecting the top sealing mechanism 2 with the gangue retaining mechanism 1. The top sealing strip 203 is fixedly arranged at the top end of the top mounting strip 201 along the length direction. Specifically, the top sealing strip 203 preferably adopts a sealing rubber with compression performance to adapt to the irregular surface shape of the gangue and ensure the top sealing effect.

[0045] The bottom fixing mechanism 3 is respectively arranged at the two ends of the bottom end of the barrier rod mechanism 1, and the top of the bottom fixing mechanism 3 is matched with the rock retaining mechanism 1 to open a bottom mounting groove 301 along the length direction, and the bottom mounting groove 301 runs through the bottom fixing mechanism 3, so as to facilitate fixing the bottom of the rock retaining mechanism 1, and further prevent the rock retaining mechanism 1 from tilting into the tunnel after being squeezed by the rock in the goaf; specifically, the width of the bottom mounting groove 301 matches the thickness of the rock retaining mechanism 1, and its depth is 5-8cm.

[0046] A method for using a gangue retaining and supporting device for a goaf-side tunnel in a coal mine comprises the following steps:

[0047] Step 1: dig a mounting hole in advance on the bottom plate of the designed rock retaining support device location for installing the bottom fixing mechanism 3. Set a number of bottom fixing mechanisms 3 according to site needs. When installing the bottom fixing mechanism 3, make the bottom mounting groove 301 parallel to the tunnel orientation, and the bottom of the bottom mounting groove 301 flush with the tunnel bottom plate. Every two adjacent rock retaining mechanisms 1 share one bottom fixing mechanism 3.

[0048] Step 2: Push the top installation groove 202 into the top installation head 101 of the rock retaining mechanism 1 from one side to complete the installation connection between the top sealing mechanism 2 and the rock retaining mechanism 1;

[0049] Step 3: Make the smooth surface of the stopper mechanism 1 face the goaf side and the rough surface face the roadway side, extend the upper part of the rock retaining mechanism 1 into the goaf side of the top cutting line to a predetermined height, and the extension height is greater than the depth of the bottom mounting groove 301, so as to facilitate the placement of the rock retaining mechanism 1 into the bottom mounting groove 301, and then place the bottom of the rock retaining mechanism 1 into the bottom mounting groove 301, and the top sealing mechanism 2 should be completely located in the goaf above the top cutting line to achieve a better sealing effect on the top;

[0050] Step 4: After installing a piece of rock retaining support device, an I-beam 4 or a single hydraulic support is installed on the side of the rock retaining support device close to the roadway, and the installation of the first rock retaining support device is completed at this time;

[0051] Step 5. Repeat steps 1 to 3 to install the second rock retaining support device, then adjust the height of the second rock retaining mechanism 1, insert the side mounting head 103 of the second rock retaining mechanism 1 into the side mounting groove 102 of the first rock retaining mechanism 1, and insert the provided bolts 106 into the connecting nut 105 on the second rock retaining mechanism 1 and the fixing nut 104 on the first rock retaining mechanism 1 in sequence, finally tighten all the bolts 106 to complete the fixation between the two rock retaining mechanisms 1, and then install the I-beam 4 or a single hydraulic support, and repeat the installation of the remaining rock retaining support devices in this way.

[0052] The present invention is used in conjunction with an I-steel 4 or a single column, and can withstand a certain lateral pressure, thereby improving the quality of the gangue retaining support and ensuring the effect of retaining the lane. A top sealing mechanism 2 is arranged on the top of the gangue retaining mechanism 1 to reduce air leakage from the lane to the goaf. The side surface of the gangue retaining mechanism 1 on the lane is a rough surface, which is conducive to the attachment of slurry, further consolidating the anti-air leakage effect. The bottom is installed through a bottom fixing mechanism 3, which can further prevent the gangue retaining mechanism 1 from tilting into the lane after being squeezed by the gangue in the goaf.

[0053] The rock retaining mechanism 1 is connected by a side mounting groove 102 and a side mounting head 103 and is fastened by bolts 106. The installation process is simple, and the workers can operate conveniently, thereby reducing the labor intensity of the workers.

[0054] By using the rock retaining support device of the present invention, standardization of rock retaining support can be achieved, which has practical significance for promotion and use.

[0055] The parts not described in detail in the present invention are all well-known technologies to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical equipment, devices or solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A gangue retaining and supporting device for goaf-side lane retaining in coal mines, which cooperates with I-beams or single hydraulic props to support the goaf side when the goaf-side lane retaining is carried out by cutting the top and unloading the pressure, and is characterized in that: The rock retaining and supporting device comprises: The rock retaining mechanism (1) is a prefabricated plate body, the top end of which is provided with a top mounting head (101) along the length direction, one end surface of the rock retaining mechanism (1) is provided with a side mounting groove (102) along the length direction, and the other end surface is provided with a side mounting head (103) matching the side mounting groove (102); The top sealing mechanism (2) comprises a top mounting bar (201) having a length equivalent to that of the gangue retaining mechanism (1), a top mounting groove (202) being formed at the bottom of the top mounting bar (201) to match the top mounting head (101), and a top sealing bar (203) being fixedly provided at the top end of the top mounting bar (201) along the length direction; The bottom fixing mechanism (3) is respectively arranged at two ends of the bottom of the rock retaining mechanism (1), and the top of the bottom fixing mechanism (3) is matched with the rock retaining mechanism (1) to form a bottom mounting groove (301), and the bottom mounting groove (301) passes through the bottom fixing mechanism (3); The rock-blocking mechanism (1) is provided with a fixing nut (104) and a connecting nut (105) on one side of the side mounting groove (102) and the side mounting head (103), respectively. The fixing nut (104) and the connecting nut (105) are arranged at a predetermined distance in the height direction of the rock-blocking mechanism (1) and correspond to each other one by one. The connecting nut (105) is matched with a bolt (106). The fixing nut (104) has a smooth surface inside, and its inner diameter is larger than the diameter of the bolt (106). The connecting nut (105) has an internal thread inside, and the thread size matches the thread size of the bolt (106). The height of the rock-blocking mechanism (1) matches the cutting top height, and the width matches the shifting step of the hydraulic support of the mining face. The rock-blocking mechanism (1) has a smooth surface on one side and a rough surface on the other side.

2. The device for supporting gob-side gangue in coal mines according to claim 1 is characterized in that: The top mounting head (101) is in a quadrangular pyramid structure, and the top area of ​​the top mounting head (101) is larger than the bottom area.

3. The device for supporting gob-side gangue in coal mines according to claim 1 is characterized in that: The top sealing strip (203) is made of sealing rubber with compression performance.

4. The device for supporting gob-side gangue in coal mines according to claim 1 is characterized in that: The side mounting groove (102) is a groove with a rectangular cross section, and the side mounting head (103) is a rectangular parallelepiped structure matching the side mounting groove (102).

5. The device for supporting gob-side gangue in coal mines according to claim 1 is characterized in that: A side sealing strip is provided in the side mounting groove (102).

6. The device for supporting gob-side gangue retaining in coal mines according to claim 1 is characterized in that: The width of the bottom mounting groove (301) matches the thickness of the rock retaining mechanism (1), and its depth is 5-8 cm.

7. A method for using a gangue retaining and supporting device for gob-side entry in a coal mine according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: dig a mounting hole in advance on the bottom plate of the designed rock retaining support device location for installing the bottom fixing mechanism (3). A plurality of bottom fixing mechanisms (3) are arranged according to the needs of the site. When installing the bottom fixing mechanism (3), the direction of the bottom mounting groove (301) is parallel to the orientation of the tunnel, the bottom of the bottom mounting groove (301) is flush with the bottom plate of the tunnel, and each two adjacent rock retaining mechanisms (1) share one bottom fixing mechanism (3); Step 2: Push the top installation groove (202) into the top installation head (101) of the rock retaining mechanism (1) from one side, so as to complete the installation connection between the top sealing mechanism (2) and the rock retaining mechanism (1); Step 3: With the smooth surface of the rock retaining mechanism (1) facing the goaf side and the rough surface facing the tunnel side, the upper portion of the rock retaining mechanism (1) is extended into the goaf side of the top cutting line to a predetermined height, the extended height being greater than the depth of the bottom mounting groove (301), and then the bottom of the rock retaining mechanism (1) is placed into the bottom mounting groove (301), and the top sealing mechanism (2) should be completely located in the goaf above the top cutting line; Step 4: After installing a piece of rock retaining support device, an I-beam (4) or a single hydraulic support is installed on the side of the rock retaining support device close to the roadway. At this time, the installation of the first piece of rock retaining support device is completed; Step 5. Repeat steps 1 to 3 to install the second rock retaining support device, adjust the height of the second rock retaining mechanism (1), insert the side mounting head (103) of the second rock retaining mechanism (1) into the side mounting groove (102) of the first rock retaining mechanism (1), and insert the provided bolts (106) into the connecting nuts (105) on the second rock retaining mechanism (1) and the fixing nuts (104) on the first rock retaining mechanism (1) in sequence, and finally tighten all the bolts (106) to complete the fixation between the two rock retaining mechanisms, and then install the I-beam (5) or the single hydraulic support, and repeat the installation of the remaining rock retaining support devices in this way.

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