Goaf roadway protecting and side attaching supporting and reinforcing coupling method

Abstract

The invention discloses a goaf roadway protection and side attaching support reinforcement coupling method, and belongs to the technical field of gob-side entry retaining support. According to the method, the movable intelligent hydraulic supports, the side-sticking columns and the metal net are matched to form a goaf roadway protection side-sticking supporting and reinforcing coupling stress system, by means of the goaf roadway protection side-sticking supporting and reinforcing coupling method, goaf roadway protection deformation can be controlled within an acceptable range, roadway protection stress coupling of a goaf roadway face in different periods is achieved, and the goaf roadway protection effect is improved. The repeated damage influence of the existing gob side protection reinforcing support on the top plate is eliminated, the labor intensity of personnel is reduced, reliable technical guarantee is provided for the roadway protection quality, safety and benefits can be greatly improved, and the method has good applicability and is suitable for large-scale application and popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of gob-side tunnel retaining support, and specifically relates to a gob-side tunnel retaining support reinforcement coupling method. Background Art

[0002] Gob-side tunnel retention is to retain a tunnel using reasonable in-tunnel support technology and tunnel-side support technology (gangue, concrete, high-water material, dense pillars, etc.) during the mining process of the current working face for normal use in the next working face. It has the advantages of improving resource recovery rate, relieving the tension of mining and excavation succession, and providing space for gas control. The side support of gob-side tunnel protection is the key to tunnel formation. Any tunnel protection method has the problem that poor side support can easily cause tunnel roof accidents and increase tunnel protection costs.

[0003] The existing side supports for goaf-side protection tunnels have the following problems: ① The strength of the permanent side supports for the dynamic pressure section of the goaf protection tunnel is difficult to adapt to the impact of multi-directional mobile mine pressure, and the deformation of the protection tunnel is difficult to control within an acceptable range; ② The permanent side supports for the dynamic pressure section of the goaf protection tunnel are difficult to couple with the longitudinal force of the reinforced support, resulting in repeated damage to the roof of the goaf protection tunnel; ③ The lateral force of the permanent side supports for the goaf protection tunnel is poor.

[0004] Therefore, the existing technology needs to be further improved, and a coupling method for reinforcement of side support of goaf protection lane is proposed for this purpose. Summary of the invention

[0005] The purpose of the present invention is to provide a coupling method for supporting and reinforcing the sidewalls of a goaf protection lane in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the present invention is as follows: a coupling method for reinforcement of sidewall support of goaf protection lane, comprising the following steps:

[0007] S1: Design and process movable intelligent hydraulic supports, supporting columns and metal meshes and transport them to the application site of the coal mine;

[0008] S2: Place metal mesh, supporting columns and movable intelligent hydraulic supports on one side of the goaf where goaf protection is required, and connect the hydraulic pipeline system of the movable intelligent hydraulic supports on site;

[0009] S3: attach the movable intelligent hydraulic support to the outside of the metal mesh, inject liquid into the movable intelligent hydraulic support and raise it to the top plate to meet the initial support force value requirement, and fix the locking parts of the metal mesh and the supporting column;

[0010] S4: The metal meshes spliced ​​in sequence are connected into a whole through fixing parts, and together with the supporting columns and the movable intelligent hydraulic supports, a coupled force-bearing system for supporting and reinforcing the sidewalls of the goaf protection lane is formed;

[0011] S5: Move the movable intelligent hydraulic support at the position affected by the dynamic pressure in the goaf to the new installation point, set multiple anchors at the original metal mesh position for secondary fixation, and spray concrete to seal the goaf;

[0012] S6: Repeat steps S2 and S5 along the direction of the goaf protection tunnel advancement until the side support reinforcement coupling support is completed.

[0013] In a preferred embodiment, the supporting columns are in plurality and are arranged equidistantly along a vertical position on the outside of the metal mesh, and the supporting columns are made of steel.

[0014] In a preferred embodiment, the metal mesh is a diamond-shaped steel mesh and is at least one layer, and the mesh size of the metal mesh is ≦50 mm.

[0015] In a preferred embodiment, the top beam and the bottom beam of the movable intelligent hydraulic support are both hollow frame structures, and the top beam and the bottom beam are both embedded with pressure sensors. The movable intelligent hydraulic support is also provided with a main control terminal electrically connected to the pressure sensor.

[0016] In a preferred embodiment, the fixing member is a steel coupling ear, and a plurality of the steel coupling ears are equidistantly arranged on the top, bottom and both sides of the metal mesh, and the steel coupling ear has at least one hole.

[0017] In a preferred embodiment, the anchoring member is a grouting anchor rod, and the metal mesh is provided with a plurality of anchoring holes spaced from top to bottom to accommodate the insertion of the grouting anchor rod.

[0018] In a preferred embodiment, in step S5, the concrete is steel fiber concrete.

[0019] In a preferred embodiment, the locking member is an anchor rod, and the support column is fixed to the wall surface of the goaf along its length direction by a plurality of anchor rods, so as to fix the metal mesh to one side of the goaf.

[0020] In a preferred embodiment, a flexible closed rock baffle is vertically arranged on one end of the movable intelligent hydraulic support facing the metal mesh.

[0021] In a preferred embodiment, after the goaf has been affected by dynamic pressure, an inner reinforcement layer is formed between the metal mesh and the goaf by compacting the gangue.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. In the present invention, a movable intelligent hydraulic support, a side support column and a metal mesh are used in the dynamic pressure section of the goaf to form a goaf protection lane side support reinforcement coupling force system, which can control the deformation of the goaf protection lane within an acceptable range, realize the force coupling of the goaf protection lane at different times, eliminate the repeated damage of the roof by the existing goaf protection side reinforcement support, reduce the labor intensity of personnel and provide reliable technical guarantee for the quality of the goaf protection, greatly improve safety and efficiency, have good applicability, and are suitable for large-scale promotion and application;

[0024] 2. In the present invention, during the dynamic pressure period on the side of the goaf, the force of the side support for the lane protection is mainly carried out by the movable intelligent hydraulic support. After the dynamic pressure period is over, the movable intelligent hydraulic support can be moved to other dynamic pressure positions in the goaf for reinforcement support, which can save the overall reinforcement cost, and can also be applied to various anchor net supports for goaf protection lane support and reinforcement support in coal seams of different thicknesses, which can greatly improve safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a simplified structural schematic diagram of the goaf protection lane support reinforcement coupling method of the present invention.

[0026] Markings in the figure: 1- movable intelligent hydraulic support, 2- pressure sensor, 3- flexible closed gangue baffle, 4- metal mesh, 5- supporting column, 6- locking piece, 7- anchoring piece. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Reference Figure 1 A method for coupling reinforcement of sidewall support in goaf protection lanes, comprising the following steps:

[0029] S1: Design and process the movable intelligent hydraulic support 1, the supporting column 5 and the metal mesh 4 and transport the movable intelligent hydraulic support 1, the supporting column 5 and the metal mesh 4 to the application site of the coal mine;

[0030] S2: Place the metal mesh 4, the supporting column 5 and the movable intelligent hydraulic support 1 on one side of the goaf where the goaf protection is required, and connect the hydraulic pipeline system of the movable intelligent hydraulic support 1 on site;

[0031] S3: attach the movable intelligent hydraulic support 1 to the outside of the metal mesh 4, inject liquid into the movable intelligent hydraulic support 1 to raise it to the top plate and reach the initial support force value requirement, and fix the metal mesh 4 and the locking piece 6 of the supporting column 5;

[0032] S4: The metal meshes 4 which are spliced ​​in sequence are connected into a whole through fixing parts, and together with the supporting columns 5 and the movable intelligent hydraulic support 1, a coupled force-bearing system for supporting and reinforcing the sidewalls of the goaf protection lane is formed;

[0033] S5: Move the movable intelligent hydraulic support 1 at the position where the goaf has been affected by dynamic pressure to the new installation point, set multiple anchors 7 at the original metal mesh 4 position for secondary fixation, and spray concrete to seal the goaf;

[0034] S6: Repeat steps S2 and S5 along the direction of the goaf protection tunnel advancement until the side support reinforcement coupling support is completed.

[0035] The present invention discloses a method for reinforcing the side support coupling of goaf protection lanes. By utilizing a movable intelligent hydraulic support 1, a side support column 5 and a metal mesh 4 to form a goaf protection lane side support reinforcement coupling force system, the deformation of the goaf protection lanes can be controlled within an acceptable range, the force coupling of the lane protection at different periods of the goaf lane surface can be achieved, the influence of the existing goaf protection side reinforcement support on the repeated destruction of the roof can be eliminated, the labor intensity of personnel can be reduced, and the quality of the lane protection can be provided with reliable technical guarantees, which can greatly improve safety and efficiency, has good applicability, and is suitable for large-scale promotion and application.

[0036] Among them, during the dynamic pressure period of the goaf, the force of the side support of the roadway protection is mainly based on the movable intelligent hydraulic support 1, supplemented by the side support column 5 and the metal mesh 4. After the dynamic pressure period of the goaf, the side support of the roadway protection is supplemented by the side support of the goaf, and the compacted gangue in the goaf is mainly used. While ensuring the support strength, it can also achieve the coupling of the force of the roadway protection at different times in the goaf.

[0037] In addition, when the dynamic pressure period is over, the movable intelligent hydraulic support 1 is moved to other dynamic pressure positions in the goaf for reinforcement support, which can save the overall reinforcement cost. It can also be applied to various anchor net supports, goaf protection lane support and reinforcement support in coal seams of different thicknesses, which can greatly improve safety and efficiency.

[0038] Furthermore, when the goaf has been affected by dynamic pressure, an internal reinforcement layer is formed between the metal mesh 4 and the goaf by compacting the gangue (not shown in the figure). Under the influence of dynamic pressure, the gangue will fall downward from the goaf. Under the blocking effect of the coupled force system of the goaf protection support reinforcement, the fallen gangue will gradually form a dense internal reinforcement layer at the inner end of the metal mesh 4, so that after the movable intelligent hydraulic support 1 is moved out, the lateral force strength of the permanent support of the goaf protection can also be guaranteed.

[0039] Furthermore, there are multiple supporting columns 5 which are equidistantly arranged along the vertical position on the outside of the metal mesh 4. The supporting columns 5 are made of steel material, and the locking parts 6 are anchor rods. The supporting columns 5 are fixed to the wall of the goaf through multiple anchor rods along their length direction, and are used to fix the metal mesh 4 on one side of the goaf. The metal mesh 4 can be fixed to the wall of the goaf through multiple supporting columns 5, thereby forming a mesh reinforcement layer.

[0040] Among them, the fixed length values ​​of the support column 5 and the metal mesh 4 must meet the minimum and maximum support height usage regulations, which will not be elaborated here. The variable value of the support column 5 is ≦200mm.

[0041] Furthermore, the metal mesh 4 is a diamond-shaped steel mesh and is at least one layer. The mesh size of the metal mesh 4 is ≦50 mm. Affected by the shape of the diamond-shaped steel mesh itself, the metal mesh 4 itself has good tensile properties and elasticity, can buffer the impact of external forces (such as gangue, etc.), and is not easy to tear after the mesh is connected. The diamond-shaped steel mesh needs to be galvanized.

[0042] Furthermore, the top beam and the bottom beam of the movable intelligent hydraulic support 1 are both hollow frame structures, and the top beam and the bottom beam are both embedded with pressure sensors 2. The movable intelligent hydraulic support 1 is also provided with a main control end electrically connected to the pressure sensor 2. The designed pressure sensor 2 can monitor the pressure data of the movable intelligent hydraulic support 1 when it contacts the roof in real time, and can also assist in detecting the mine pressure conditions of the goaf itself.

[0043] Furthermore, the fixing member is a steel connecting ear (not shown in the figure), and multiple steel connecting ears are equidistantly arranged on the top, bottom and both sides of the metal mesh 4. The steel connecting ear has at least one hole. The adjacent metal meshes 4 can be spliced ​​and fixed into a whole by using multiple steel connecting ears and bolts. The fixing member can also be a braided steel wire or other similar materials that can be fixed and tied, which will not be elaborated here.

[0044] Furthermore, the anchor 7 is a grouting anchor rod, and the metal mesh 4 is provided with a plurality of anchor holes spaced from top to bottom for inserting the grouting anchor rod. The use of the grouting anchor rod as the anchor 7 can achieve rapid support and can play a good role in additional reinforcement and strengthening. After the movable intelligent hydraulic support 1 is moved out, the overall support strength can also be guaranteed.

[0045] The spacing between the anchor holes is preferably 2 m, which is not specifically limited here.

[0046] Furthermore, in step S5, the concrete is steel fiber concrete, and the randomly distributed steel fibers in the steel fiber concrete can effectively hinder the expansion of microcracks inside the concrete and the formation of macrocracks, significantly improving the tensile, bending, impact and fatigue resistance of the concrete, thereby ensuring the strength of the subsequent concrete wall.

[0047] Furthermore, a flexible closed rock baffle plate 3 is vertically arranged at one end of the movable intelligent hydraulic support 1 facing the metal mesh 4. The flexible closed rock baffle plate 3 can prevent the leaked rock from falling along the metal mesh 4 into the movable intelligent hydraulic support 1, thereby preventing the leaked rock from causing damage to the movable intelligent hydraulic support 1 and workers.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coupling method for reinforcement of sidewall support in goaf protection lanes, characterized in that: The steps include: S1: Design and process movable intelligent hydraulic supports, supporting columns and metal meshes and transport them to the application site of the coal mine; S2: Place metal mesh, supporting columns and movable intelligent hydraulic supports on one side of the goaf where goaf protection is required, and connect the hydraulic pipeline system of the movable intelligent hydraulic supports on site; S3: attach the movable intelligent hydraulic support to the outside of the metal mesh, inject liquid into the movable intelligent hydraulic support and raise it to the top plate to meet the initial support force value requirement, and fix the locking parts of the metal mesh and the supporting column; S4: The metal meshes spliced ​​in sequence are connected into a whole through fixing parts, and together with the supporting columns and the movable intelligent hydraulic supports, a coupled force-bearing system for supporting and reinforcing the sidewalls of the goaf protection lane is formed; S5: Move the movable intelligent hydraulic support at the position affected by the dynamic pressure in the goaf to the new installation point, set multiple anchors at the original metal mesh position for secondary fixation, and spray concrete to seal the goaf; S6: Repeat steps S2 and S5 along the direction of the goaf protection tunnel advancement until the side support reinforcement coupling support is completed.

2. A method for coupling reinforcement of side support of goaf protection lanes according to claim 1, characterized in that: There are multiple supporting columns which are evenly arranged on the outside of the metal mesh along the vertical position, and the supporting columns are made of steel material.

3. A method for coupling reinforcement of side support of goaf protection lanes according to claim 1, characterized in that: The metal mesh is a diamond-shaped steel mesh and is at least one layer, and the mesh size of the metal mesh is ≦50mm.

4. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: The top beam and the bottom beam of the movable intelligent hydraulic support are both hollow frame structures, and the top beam and the bottom beam are both embedded with pressure sensors. The movable intelligent hydraulic support is also provided with a main control terminal electrically connected to the pressure sensor.

5. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: The fixing piece is a steel connecting ear, and a plurality of the steel connecting ears are equidistantly arranged on the top, bottom and both sides of the metal mesh, and the steel connecting ear has at least one hole.

6. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: The anchoring piece is a grouting anchor rod, and the metal mesh is provided with a plurality of anchoring holes spaced from top to bottom to meet the requirements of inserting the grouting anchor rod.

7. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: In step S5, the concrete is steel fiber concrete.

8. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: The locking member is an anchor rod, and the support column is fixed to the wall surface of the goaf through a plurality of anchor rods along its length direction, so as to fix the metal mesh on one side of the goaf.

9. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: The end of the movable intelligent hydraulic support facing the metal mesh is also vertically provided with a flexible closed rock baffle.

10. A method for coupling reinforcement of sidewall support of goaf protection lanes according to claim 1, characterized in that: When the goaf has been affected by dynamic pressure, an inner reinforcement layer is formed between the metal mesh and the goaf by compacting the gangue.

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