Gob-side entry retaining starting section roadway crossing intersection reinforcing method

Abstract

The invention discloses a gob-side entry retaining starting section roadway crossing intersection reinforcing method which comprises the steps that when a entry retaining working face is stoped to a roadway crossing, roadside filling body pouring is started in advance; when the distance between the continuous working face open-off cut and the entry retaining working face is within the mine pressure influence range, secondary entry forming of the continuous working face open-off cut is not carried out, meanwhile, unit supports are adopted for temporary supporting within the mine pressure influence range, after the working face entry retaining is stable, secondary entry forming is carried out, then removing is carried out in time, and supporting is only carried out within the roadway intersection range; and along with continuous forward stoping of the entry retaining working face, after the stoping working face passes through the intersection, a single body and a hinged top beam are filled in time for temporary supporting, a waste rock blocking device is pushed to the position behind the end support of the working face, waste rock blocking supporting is completed, reinforcement of the intersection passing through the roadway at the starting section of the gob-side entry retaining is completed, and a normal entry retaining construction cycle is started. The method provided by the invention solves the problem that the existing gob-side entry retaining starting section crossing roadway intersection is weak in protection and relatively large potential safety hazards are left.

Description

Technical Field

[0001] The invention belongs to the technical field of coal pillar-free mining methods in coal mines, and in particular relates to a method for reinforcing a tunnel intersection at a starting section of a gob-side tunnel retaining tunnel. Background Art

[0002] The transport drift or return air drift behind the mined working face is retained along the goaf by a certain method as the drift of the next working face, which is called goaf-side lane retention. The goaf-side lane retention adopts a two-side three-lane layout. According to the length of the working face, it can be divided into three different forms: the first is that the length of the lane retention working face is greater than the subsequent working face; the second is that the lane retention working face is equal to the subsequent working face; the third is that the lane retention working face is smaller than the subsequent working face.

[0003] For the technology of retaining lanes along the goaf in coal-pillar-free mining, the construction of the starting section of the retaining lane is crucial. When the backfill body beside the lane is subjected to stress, with continuous mining, the top plate of the arc triangle area, i.e., the retaining lane operation space, is supported by the wall on one side and the solid coal pillar on the other side. The basic top boundary support condition of the mining area is conducive to the stability of the surrounding rock of the lane. When the length of the retaining lane working face is greater than the subsequent working face, the starting section of the retaining lane working face is the lane intersection. At this time, one side of the top plate of the retaining lane operation space is the goaf area, and the other side is not supported by the solid coal pillar. The basic top boundary support condition of the mining area is not conducive to the stability of the surrounding rock of the lane. Moreover, the lane intersection is located in the lane support pressure superposition area. The roof needs to control a large area, which is the weakest zone in the mine lane support system. When the retaining lane construction is carried out in this space, there are great safety hazards. Therefore, the success of the retaining lane depends to a certain extent on whether the reinforcement means of the starting section of the retaining lane along the goaf through the lane intersection are scientific and reasonable. Summary of the invention

[0004] The purpose of the present invention is to provide a method for reinforcing the intersection of the tunnels in the starting section of the gob-side tunnel retention, which solves the problem that the existing intersection of the tunnels in the starting section of the gob-side tunnel retention is weak in protection and has great safety hazards.

[0005] The technical scheme adopted by the present invention is: a reinforcement method for the starting section of the gob-retaining lane passing through the lane intersection, when the lane retaining working face is mined to the lane intersection, the pouring of the lane side filling body is started in advance; when the subsequent working face cutting eye is within the influence range of the mining pressure of the lane retaining working face, the subsequent working face cutting eye is not carried out for secondary lane formation, and at the same time, unit supports are used for temporary support within the influence range of the mining pressure, and after the lane retaining of the working face is stable, the secondary lane formation is carried out and then the support is promptly removed, and support is only carried out within the range of the lane intersection; as the lane retaining working face is continuously mined forward, after the mining working face passes the intersection, the single unit and hinged top beams are promptly added for temporary support, and under the cover of the wall bearing and the intersection reinforcement support, the rock retaining device is promptly pushed to the rear of the working face end support to complete the rock retaining support, and the reinforcement of the starting section of the gob-retaining lane passing through the lane intersection is completed, and the lane side filling body is poured close to the rock retaining device, and the normal lane retaining construction cycle is entered.

[0006] The technical solution adopted by the present invention is also characterized in that: Furthermore, the reinforcement method of the starting section of the gob-side tunnel through the tunnel intersection is specifically implemented according to the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 2: Continue cutting and reinforcing the working surface; Step 3: Reinforce the tunnel intersection after mining.

[0007] Furthermore, in step 1, when the tunnel-retaining working face is mined to a distance of 10m-20m from the tunnel intersection, pouring of the tunnel side filling body is started in advance.

[0008] Furthermore, step 1 is specifically implemented according to the following steps: Step 1.1: Use wood piles for support in the tunnel, set a row of wooden point columns close to the wood piles, and cast the first row of the horizontal wall of the filling body close to the wooden point columns; Step 1.2: Use wood piles for support in the tunnel, and lay a row of wooden point columns along the direction of the tunnel as the mining is carried out, and cast the filling body along the direction of the wall close to the wooden point columns; Step 1.3: Set up a row of wooden point columns close to the wood pile, and cast the second row of the horizontal wall of the filling body close to the wooden point columns.

[0009] Furthermore, in steps 1.1 and 1.3, a row of transverse walls of the filling body is cast at a distance of no more than 5 m from the construction direction.

[0010] Furthermore, step 2 is specifically implemented according to the following steps: Step 2.1: The cut-eye construction of the subsequent working face is cut-eye secondary lane construction, the span of the primary lane construction is 4.5m~6m, and the span of the cut-eye secondary lane construction is 3m~4.5m; within the range of influence of mining pressure of the follow-up working face cut-eye distance to the lane-keeping working face, the cut-eye secondary lane construction of the follow-up working face is not carried out; Step 2.2: Arrange temporary support of unit supports within the influence range of mining pressure of the retained tunnel working face at the cutting point of the follow-up working face.

[0011] Furthermore, two unit supports are placed in a row. After the working face has a stable tunnel of 120m~150m, the support is removed in time after the eye cutting and secondary tunneling construction is carried out. Unit support is only carried out within 5m~10m of the tunnel intersection.

[0012] Furthermore, step 3 is specifically implemented according to the following steps: Step 3.1: As the working face of the retained lane continues to move forward, a single unit is promptly added at the intersection of the lane for temporary support, and the single unit is equipped with a hinged top beam; Step 3.2: Under the protection of the wall bearing and the intersection reinforcement support, push the rock retaining device to the rear of the end bracket of the working face in time to complete the rock retaining support; Step 3.3: At this point, the reinforcement of the starting section of the gob-side tunnel retention through the tunnel intersection is completed, and the tunnel side filling body strike wall is poured close to the rock retaining device, entering the normal tunnel retention construction cycle.

[0013] The beneficial effects of the present invention are: Through the method of reinforcing the intersection of the starting section of the goaf-side tunnel retention, the basic top boundary support conditions of the intersection of the goaf-side tunnel retention are changed, thereby increasing the size of the triangular suspended plate structure, that is, expanding the protection range; the strength of the top plate is increased to prevent gangue from entering the tunnel, and the formed composite beam makes it difficult for the side top plate of the end goaf area to collapse during pouring; without affecting the normal production of the working face, the weakest area of ​​the surrounding rock can be effectively controlled to ensure the safety and stability of the construction working space, and significantly improve the success rate of tunnel retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the plan layout of the gob-side entry retaining working face in Example 6 of the present invention; Figure 2 This is a schematic diagram of the temporary reinforcement plan layout of the tunnel intersection before mining in Example 6 of the present invention; Figure 3 This is a schematic diagram of the temporary reinforcement plan layout of the tunnel after mining at the tunnel intersection in Example 6 of the present invention; Figure 4 This is a schematic diagram of the support section of the cutting reinforcement area of ​​the subsequent working face in Example 6 of the present invention.

[0015] In the figure: 1. Common drift for the working face retaining the lane; 2. Drift for the working face retaining the lane; 3. Drift for the subsequent working face; 4. Mining face for the working face retaining the lane; 5. Cutting eye for the subsequent working face; 6. Hydraulic support; 7. Lane intersection; 8. Cutting eye to form a secondary lane; 9. Unit support; 10. Horizontal wall of the filling body; 11. Wood pile; 12. Wooden point column; 13. Gangue retaining device; 14. Single body; 15. Articulated beam; 16. Stretch wall of the filling body. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0017] The present invention provides a method for reinforcing a tunnel intersection at the start section of a gob-side tunnel retention, which is specifically implemented according to the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 2: Continue cutting and reinforcing the working surface; Step 3: Reinforce the tunnel intersection after mining.

[0018] Step 1 is implemented according to the following steps: 1) When the working face of the reserved roadway is mined to 7 10m-20m away from the roadway intersection, the pouring of the roadside filling body begins; 2) A woodpile 11 is built with semi-circular logs for support in the tunnel, a row of wooden point columns 12 is set close to the woodpile 11, and the first row of the horizontal wall 10 of the filling body is cast and sealed close to the wooden point columns 12; 3) Use half-round logs to build wood piles 11 for support in the tunnel, and lay a row of wooden point columns 12 along the direction of the tunnel as the mining is carried out, and pour the filling body direction wall 16 close to the wooden point columns 12; 4) A row of wooden point columns 12 are arranged horizontally in the lane, and the second row of filling body transverse walls 10 are cast and sealed close to the wooden point columns 12, thus completing a cycle; 5) The length of each construction cycle shall not exceed 5m, and the above cycle shall be repeated until the construction reaches the lane intersection 7.

[0019] Step 2 is implemented as follows: 1) The construction of cutting eye 5 in the follow-up working face is to cut the eye and form the secondary lane 8, the span of the primary lane is 4.5m~6m, and the span of the secondary lane 8 is 3m~4.5m; within the range of influence of mining pressure of the follow-up working face cutting eye 5 and the retained lane working face, the construction of secondary lane 8 in the follow-up working face cutting eye 5 is not carried out; 2) Arrange temporary support of unit support 9 within the range of influence of mining pressure of the tunnel working face and the cutting eye 5 of the follow-up working face; 3) Two unit supports 9 are installed in a row. When the working face has a stable lane of 120 m ~ 50 m, the unit supports 9 are removed in time after the eye cutting and secondary lane 8 construction is carried out. Only the lane intersection 7 within 5m ~ 10m is retained for support.

[0020] Step 3 is implemented as follows: 1) As the retained lane working face continues to move forward, the single unit 14 is promptly drilled for temporary support, and the single unit 14 is equipped with a hinged top beam 15; 2) Under the protection of surrounding rock control measures such as wall bearing and intersection reinforcement support, the rock retaining device 13 is pushed to the rear of the end support of the working face in a timely manner to complete the rock retaining support; 3) At this point, the reinforcement of the starting section of the gob-side tunnel retention through the tunnel intersection is completed, and the tunnel side filling body strike wall 16 is poured close to the rock retaining device 13, entering the normal tunnel retention construction cycle.

[0021] The composition of the present invention is further described below by way of examples and drawings.

[0022] Example 1 The reinforcement method for the starting section of the gob-retained lane passing through the lane intersection is as follows: when the lane-retaining working face is mined to the lane intersection, the lane side filling body is poured in advance; when the subsequent working face cuts the eye within the range of influence of the mining pressure of the lane-retaining working face, the subsequent working face does not cut the eye for secondary lane formation, and at the same time, unit supports are used for temporary support within the range of influence of the mining pressure. After the lane of the working face is stable, the secondary lane formation is carried out and then the support is promptly removed, and support is only carried out within the range of the lane intersection; as the lane-retaining working face continues to be mined forward, after the mining working face passes the intersection, the single unit and articulated top beams are promptly added for temporary support, and under the cover of the wall bearing and the intersection reinforcement support, the rock retaining device is promptly pushed to the rear of the working face end support to complete the rock retaining support, and the reinforcement of the starting section of the gob-retained lane passing through the lane intersection is completed, and the lane side filling body is poured close to the rock retaining device, and the normal lane-retaining construction cycle is entered.

[0023] Example 2 The reinforcement method of the starting section of the gob-side tunnel through the tunnel intersection is implemented in the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 1.1, a wood pile 11 is used for support in the tunnel, a row of wooden point columns 12 are arranged close to the wood pile 11, and the first row of the filling body transverse wall 10 is cast close to the wooden point columns 12; Step 1.2, use wood piles 11 for support in the tunnel, and lay a row of wooden point columns 12 along the direction of the tunnel as the mining is carried out, and pour the filling body direction wall 16 close to the wooden point columns 12; Step 1.3, a row of wooden point columns 12 is arranged close to the wood pile 11, and the second row of the filling body transverse wall 10 is cast close to the wooden point columns 12.

[0024] Step 2: Continue cutting and reinforcing the working surface; Step 2.1, the construction of cutting eye 5 of the subsequent working face is to cut the eye and form a secondary lane 8, the span of the primary lane is 4.5m~6m, and the span of the secondary lane 8 of the cutting eye is 3m~4.5m; within the range of influence of mining pressure of the subsequent working face cutting eye 5 and the retained lane working face, the secondary lane construction of the cutting eye 5 of the subsequent working face is not carried out; Step 2.2: Arrange temporary support of unit bracket 9 at the cut-eye 5 of the connecting working face within the influence range of mining pressure of the retained lane working face.

[0025] Step 3: Reinforcement of tunnel intersections after mining; Step 3.1, as the roadway-retaining working face continues to move forward, the single unit 14 is promptly added at the roadway intersection for temporary support, and the single unit 14 is equipped with a hinged top beam 15; Step 3.2, under the protection of the wall bearing and the intersection reinforcement support, push the rock blocking device 13 to the rear of the working face end bracket in time to complete the rock blocking support; Step 3.3, the reinforcement of the starting section of the gob-side tunneling through the tunnel intersection is completed, and the tunnel side filling body strike wall 16 is poured close to the rock retaining device 13, entering the normal tunneling construction cycle.

[0026] Example 3 The reinforcement method of the starting section of the gob-side tunnel through the tunnel intersection is implemented in the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 1.1, a wood pile 11 is used for support in the tunnel, a row of wooden point columns 12 are arranged close to the wood pile 11, and the first row of the filling body transverse wall 10 is cast close to the wooden point columns 12; Step 1.2, use wood piles 11 for support in the tunnel, and lay a row of wooden point columns 12 along the direction of the tunnel as the mining is carried out, and pour the filling body direction wall 16 close to the wooden point columns 12; Step 1.3, a row of wooden point columns 12 is arranged close to the wood pile 11, and the second row of the filling body transverse wall 10 is cast close to the wooden point columns 12.

[0027] In step 1, when the tunnel-retaining working face is mined to a distance of 10m-20m from the tunnel intersection, pouring of the tunnel side filling body is started in advance.

[0028] Step 2: Continue cutting and reinforcing the working surface; Step 2.1, the construction of cutting eye 5 of the subsequent working face is to cut the eye and form a secondary lane 8, the span of the primary lane is 4.5m~6m, and the span of the secondary lane 8 of the cutting eye is 3m~4.5m; within the range of influence of mining pressure of the subsequent working face cutting eye 5 and the retained lane working face, the secondary lane construction of the cutting eye 5 of the subsequent working face is not carried out; Step 2.2: Arrange temporary support of unit bracket 9 at the cut-eye 5 of the connecting working face within the influence range of mining pressure of the retained lane working face.

[0029] Step 3: Reinforcement of tunnel intersections after mining; Step 3.1, as the roadway-retaining working face continues to move forward, the single unit 14 is promptly added at the roadway intersection for temporary support, and the single unit 14 is equipped with a hinged top beam 15; Step 3.2, under the protection of the wall bearing and the intersection reinforcement support, push the rock blocking device 13 to the rear of the working face end bracket in time to complete the rock blocking support; Step 3.3, the reinforcement of the starting section of the gob-side tunneling through the tunnel intersection is completed, and the tunnel side filling body strike wall 16 is poured close to the rock retaining device 13, entering the normal tunneling construction cycle.

[0030] Example 4 The reinforcement method of the starting section of the gob-side tunnel through the tunnel intersection is implemented in the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 1.1, a wood pile 11 is used for support in the tunnel, a row of wooden point columns 12 are arranged close to the wood pile 11, and the first row of the filling body transverse wall 10 is cast close to the wooden point columns 12; Step 1.2, use wood piles 11 for support in the tunnel, and lay a row of wooden point columns 12 along the direction of the tunnel as the mining is carried out, and pour the filling body direction wall 16 close to the wooden point columns 12; Step 1.3, a row of wooden point columns 12 is arranged close to the wood pile 11, and the second row of the filling body transverse wall 10 is cast close to the wooden point columns 12.

[0031] In steps 1.1 and 1.3, a row of backfill transverse walls 10 are cast at a distance of no more than 5 m from the strike direction.

[0032] In step 1, when the tunnel-retaining working face is mined to a distance of 10m-20m from the tunnel intersection, pouring of the tunnel side filling body is started in advance.

[0033] Step 2: Continue cutting and reinforcing the working surface; Step 2.1, the construction of cutting eye 5 of the subsequent working face is to cut the eye and form a secondary lane 8, the span of the primary lane is 4.5m~6m, and the span of the secondary lane 8 of the cutting eye is 3m~4.5m; within the range of influence of mining pressure of the subsequent working face cutting eye 5 and the retained lane working face, the secondary lane construction of the cutting eye 5 of the subsequent working face is not carried out; Step 2.2: Arrange temporary support of unit bracket 9 at the cut-eye 5 of the connecting working face within the influence range of mining pressure of the retained lane working face.

[0034] Step 3: Reinforcement of tunnel intersections after mining; Step 3.1, as the roadway-retaining working face continues to move forward, the single unit 14 is promptly added at the roadway intersection for temporary support, and the single unit 14 is equipped with a hinged top beam 15; Step 3.2, under the protection of the wall bearing and the intersection reinforcement support, push the rock blocking device 13 to the rear of the working face end bracket in time to complete the rock blocking support; Step 3.3, the reinforcement of the starting section of the gob-side tunneling through the tunnel intersection is completed, and the tunnel side filling body strike wall 16 is poured close to the rock retaining device 13, entering the normal tunneling construction cycle.

[0035] Example 5 The reinforcement method of the starting section of the gob-side tunnel through the tunnel intersection is implemented in the following steps: Step 1: Reinforcement of tunnel intersections before mining; Step 1.1, a wood pile 11 is used for support in the tunnel, a row of wooden point columns 12 are arranged close to the wood pile 11, and the first row of the filling body transverse wall 10 is cast close to the wooden point columns 12; Step 1.2, use wood piles 11 for support in the tunnel, and lay a row of wooden point columns 12 along the direction of the tunnel as the mining is carried out, and pour the filling body direction wall 16 close to the wooden point columns 12; Step 1.3, a row of wooden point columns 12 is arranged close to the wood pile 11, and the second row of the filling body transverse wall 10 is cast close to the wooden point columns 12.

[0036] In steps 1.1 and 1.3, a row of backfill transverse walls 10 are cast at a distance of no more than 5 m from the strike direction.

[0037] In step 1, when the tunnel-retaining working face is mined to a distance of 10m-20m from the tunnel intersection, pouring of the tunnel side filling body is started in advance.

[0038] Step 2: Continue cutting and reinforcing the working surface; Step 2.1, the construction of cutting eye 5 of the subsequent working face is to cut the eye and form a secondary lane 8, the span of the primary lane is 4.5m~6m, and the span of the secondary lane 8 of the cutting eye is 3m~4.5m; within the range of influence of mining pressure of the subsequent working face cutting eye 5 and the retained lane working face, the secondary lane construction of the cutting eye 5 of the subsequent working face is not carried out; Step 2.2: Arrange temporary support of unit bracket 9 at the cut-eye 5 of the connecting working face within the influence range of mining pressure of the retained lane working face.

[0039] There are two unit supports 9 in a row. After the working face has a stable lane of 120m~150m, they are removed in time after the eye cutting and secondary lane 8 construction is carried out. Unit supports 9 are only used within the range of 5m~10m at the lane intersection 7.

[0040] Step 3: Reinforcement of tunnel intersections after mining; Step 3.1, as the roadway-retaining working face continues to move forward, the single unit 14 is promptly added at the roadway intersection for temporary support, and the single unit 14 is equipped with a hinged top beam 15; Step 3.2, under the protection of the wall bearing and the intersection reinforcement support, push the rock blocking device 13 to the rear of the working face end bracket in time to complete the rock blocking support; Step 3.3, the reinforcement of the starting section of the gob-side tunneling through the tunnel intersection is completed, and the tunnel side filling body strike wall 16 is poured close to the rock retaining device 13, entering the normal tunneling construction cycle.

[0041] Example 6 A fully mechanized caving working face in a mine in Shanxi Province is used to retain lanes along the goaf. The working face is buried at a depth of 550m, the working face is 250m long, the coal seam thickness is 6m, the mining thickness is 3m, and the mining-caving ratio is 1:1. The method of the present invention is applied to reinforce the intersection.

[0042] The mine conducts gob-side gob retention at the gob retention working face, and finally forms a two-face three-gob layout, i.e., the gob retention working face common drift 1, the gob retention working face drift 2 and the connecting working face drift 3. Its plane layout is as follows Figure 1 As shown. The strike length of the lane-retaining working face is 1200m, and the strike length of the connecting working face is 1000m. That is, when the lane-retaining working face is mined for 200m, the mining face 4 of the lane-retaining working face intersects with the cutting eye 5 of the connecting working face, forming a lane intersection 7. This lane intersection 7 is also the starting section of the lane-retaining along the goaf. It is located in the lane support pressure superposition area. The roof needs to control a large area. It is the weakest area in the mine lane support system. Special reinforcement is required when performing lane-retaining construction in this space.

[0043] The specific measures are as follows: Step 1: Reinforce the tunnel intersection before mining, such as Figure 2 As shown; 1) When the working face of the reserved lane is mined to 10m ahead of the lane intersection 7, pouring of the lane side filling body begins; 2) Use φ200mm semi-round logs to build a woodpile 11 for support in the lane, set a row of wooden point columns 12 close to the woodpile 11, the wooden point columns 12 use φ200mm round logs, the point column spacing is 1m, and the first row of the backfill transverse wall 10 is cast close to the wooden point columns 12, with a wall thickness of 1m; 3) Use φ200mm half-round logs to build wood piles 11 for support in the tunnel. As the mining progresses, a row of wooden point columns 12 are laid along the direction of the tunnel. The wooden point columns use φ200mm round logs, and the distance between the point columns is 1m. Close to the wooden point columns 12, cast the two-mold filling body direction wall 16, with a wall thickness of 1m and a length of 2m per mold. 4) A row of wooden point columns 12 are arranged horizontally in the lane, with a distance of 1m between the columns. The second row of backfill transverse walls 10 are cast close to the wooden point columns 12, with a wall thickness of 1m; 5) The length of each construction cycle shall not exceed 5m, and the second cycle shall be repeated until the construction reaches the intersection of the alleys.

[0044] Step 2: Continue with the work surface cutting and reinforcement, such as Figure 3 and Figure 4 As shown; 1) The construction of the cut-eye 5 of the follow-up working face is a secondary tunneling, with a span of 5600mm for the primary tunneling, and a span of 3400m for the cut-eye secondary tunneling 8; The eye cutting 5 of the connecting working face can be within 40m of the shared drift 1 of the lane retaining working face. No eye cutting and secondary lane forming can be carried out during mining. After the lane retaining working face is stabilized for 120~150m, eye cutting and secondary lane forming can be carried out; 3) Within 40m of the eye cutting 5 of the connecting working face and the shared drift 1 of the lane retaining working face, temporary support of unit supports 9 is arranged. There are two unit supports 9 in a row, with a net spacing of 2800mm and a net row spacing of 500mm. After the lane retaining working face is stabilized for 120~150m after mining, the secondary lane forming is carried out and the support is removed in time, leaving only the unit support within 5m of the intersection.

[0045] Step 3: Reinforcement of tunnel intersections after mining; 1) As the tunnel working face continues to move forward, the single unit 14 is promptly added for temporary support, with 4 beams in each row, the spacing between the single units is 1000mm×1000mm, and every 2 single units are equipped with hinged beams 15; 2) Under the protection of surrounding rock control measures such as rear wall bearing and cross rear reinforcement support, the rock retaining device 13 is pushed to the rear of the #2 hydraulic support 6 in time, and the front end of the rock retaining device 13 is connected to the #2 hydraulic support 6 by 4 iron chains, thus completing the rock retaining support.

Claims

1. A reinforcement method for the intersection of the starting section of the gob-side tunnel retention, characterized in that: When the lane retaining working face is mined to the lane intersection, the pouring of the lane side filling body shall be started in advance; when the cutting eye of the subsequent working face is within the influence range of the mining pressure of the lane retaining working face, the secondary lane forming of the subsequent working face will not be carried out, and at the same time, the unit support is used for temporary support within the influence range of the mining pressure. After the lane retaining of the working face is stable, the secondary lane forming is carried out and then the support is promptly removed, and support is only carried out within the range of the lane intersection; as the lane retaining working face continues to be mined forward, after the mining working face passes the intersection, the single unit and articulated top beams are promptly added for temporary support. Under the cover of the wall bearing and the intersection reinforcement support, the rock retaining device is promptly pushed to the rear of the working face end support to complete the rock retaining support. At this point, the reinforcement of the starting section of the lane retaining along the goaf through the lane intersection is completed, and the lane side filling body is poured close to the rock retaining device, entering the normal lane retaining construction cycle.

2. The method for reinforcing the intersection of the gob-side tunnel retaining starting section according to claim 1 is characterized in that: Follow the steps below to implement it: Step 1: Reinforcement of tunnel intersections before mining; Step 2: Continue cutting and reinforcing the working surface; Step 3: Reinforce the tunnel intersection after mining.

3. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 2 is characterized in that: In step 1, when the roadway retaining working face is mined to a distance of 10m-20m from the roadway intersection (7), pouring of the roadway side filling body is started in advance.

4. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 3 is characterized in that: The step 1 is specifically implemented according to the following steps: Step 1.1, using a wood pile (11) for support in the tunnel, setting a row of wooden point columns (12) close to the wood pile (11), and pouring the first row of the filling body transverse wall (10) close to the wooden point columns (12); Step 1.2, using wood piles (11) for support in the tunnel, laying a row of wooden point columns (12) along the direction of the tunnel as the mining is being carried out, and pouring the filling body direction wall (16) close to the wooden point columns (12); Step 1.3: A row of wooden point columns (12) is arranged close to the wood pile (11), and the second row of the filling body transverse wall (10) is cast close to the wooden point columns (12).

5. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 4 is characterized in that: In the steps 1.1 and 1.3, a row of filling body transverse walls (10) are cast at a construction distance of no more than 5 m.

6. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 5 is characterized in that: The step 2 is specifically implemented according to the following steps: Step 2.1, the cutting eye (5) of the subsequent working face is constructed as the cutting eye and the secondary lane (8), the span of the primary lane is 4.5m~6m, and the span of the cutting eye and the secondary lane (8) is 3m~4.5m; within the range of influence of the mining pressure of the return mining of the lane-keeping working face from the cutting eye (5) of the subsequent working face, the cutting eye (5) and the secondary lane construction of the subsequent working face are not carried out; Step 2.2: Arrange temporary support by unit supports (9) at the cut-off point (5) of the connecting working face within the influence range of the mining pressure of the reserved working face.

7. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 6 is characterized in that: The unit supports (9) are arranged in a row of two and are removed promptly after the working face has stabilized with a lane of 120m to 150m remaining and the secondary lane (8) is cut and constructed. The unit supports (9) are only used within a range of 5m to 10m from the lane intersection (7).

8. The method for reinforcing the intersection of the starting section of the gob-side tunnel retaining according to claim 7 is characterized in that: The step 3 is specifically implemented according to the following steps: Step 3.1, as the roadway-retaining working face continues to move forward, a single unit (14) is promptly added at the roadway intersection for temporary support, and the single unit (14) is equipped with a hinged top beam (15); Step 3.2, under the protection of the wall bearing and the intersection reinforcement support, the rock blocking device (13) is pushed to the rear of the end support of the working face in a timely manner to complete the rock blocking support; Step 3.3: At this point, the reinforcement of the starting section of the gob-side tunnel retention through the tunnel intersection is completed, and the tunnel side filling body strike wall (16) is poured close to the rock retaining device (13), entering the normal tunnel retention construction cycle.

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