Roadway supporting method and steel shed

Abstract

The application discloses a kind of roadway supporting method and steel shed, it is related to coal mining operation technical field, roadway supporting method, comprising the following steps: starting to drive mining face crossheading;Along the crossheading working help fixed installation first shed leg, along the crossheading non-working help fixed installation second shed leg, in the top of first shed leg and the top of second shed leg fixed installation spliced roof beam, in the splicing of spliced roof beam fixed installation reinforcing support;Lagging behind driving working face along the crossheading non-working help pouring continuous concrete wall;In the process of mining working face advancing, gradually remove first shed leg and first beam body in spliced roof beam;In the back of concrete wall excavate next section mining working face crossheading;The application is more suitable for multiple mining area roadway geological conditions, not only easy to operate, improve construction efficiency, improve the safety factor of roadway support, but also greatly improve the recycling rate of support material, reduce material waste.

Description

Technical Field

[0001] This invention relates to the field of coal mine mining and roadway excavation technology, and in particular to a roadway support method and a steel shed. Background Technology

[0002] In the past, the use of old-style coal mining methods (pillar-type, room-and-pillar-type, and room-and-pillar-type) resulted in a large amount of residual coal resources, causing serious waste of resources. The recovery and mining of these residual coal resources is called "residual coal remining", and the area to be mined again is called the "remining zone". The remining zone contains irregular coal pillars, empty roadways, voids and collapse zones, and the surrounding rock of the roadways is broken and the surrounding rock conditions are complex.

[0003] The working face roadway is a key roadway used for coal transportation, ventilation, and equipment layout in coal mining operations.

[0004] The mainstream support methods for existing coal mine roadways include anchor cable support, frame support, or shotcrete arch support systems. However, under complex stress conditions, such as in roadways in re-mining areas where the surrounding rock is fractured and the surrounding rock conditions are complex, conventional anchor cable support methods cannot meet the requirements. Meanwhile, I-beam frame support is widely used due to its advantages such as high support strength, convenient construction, and recyclability.

[0005] The precast concrete filling wall excavation method is an effective way to improve the resource recovery rate and safe mining in the goaf. The concrete wall mainly serves to support the roof and isolate the goaf. The process flow is as follows: excavating the working face roadway (using I-beam support), pouring continuous concrete walls along the non-working side of the roadway (with I-beam top beams arranged between the roof and the concrete wall), mining the working face, and excavating the next section of the working face roadway on the other side of the wall. During the working face mining stage, it is necessary to gradually recover the I-beam support (including the top beams) in the roadway as the working face advances. However, due to the compression effect of the concrete wall on the non-working side of the roadway, it is difficult to recover the top beams of the I-beam support. Forcibly recovering the top beams will threaten the integrity and stability of the wall, seriously affecting the construction speed and the efficiency of top beam recovery. Summary of the Invention

[0006] The purpose of this invention is to provide a roadway support method and steel shed to solve the problems existing in the prior art. It is more suitable for the geological conditions of roadways in re-mining areas. It is not only easy to operate and improves construction efficiency and the safety factor of roadway support, but also greatly improves the recycling rate of support materials, reduces material waste, and ensures the maximization of coal mine benefits.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a tunnel support method, comprising the following steps:

[0009] Step 1: Begin tunneling and mining the longwall face roadway;

[0010] Step 2: Fix the first canopy leg along the working side of the roadway, fix the second canopy leg along the non-working side of the roadway, fix the splicing top beam at the top of the first and second canopy legs, and fix the reinforcing support at the splicing joint of the splicing top beam;

[0011] Step 3: Construct a continuous concrete wall along the non-working side of the roadway at the delayed excavation face;

[0012] Step 4: During the advance of the longwall face, gradually dismantle the first support leg and the first beam in the spliced ​​roof beam;

[0013] Step 5: Excavate the next section of the longwall face roadway on the back side of the concrete wall.

[0014] Preferably, the splicing top beam in step two includes a first beam and a second beam. The first end of the first beam and the first end of the second beam are detachably fixedly connected. The width of the second beam is greater than the width of the concrete wall in step three. The concrete wall in step three is placed below the second beam.

[0015] Preferably, in step two, the reinforcing support member fixedly installed at the joint between the first end of the first beam and the first end of the second beam is a column. The column is vertically arranged, and the top of the column can contact the first end of the first beam and the first end of the second beam to support the first end of the first beam and the first end of the second beam.

[0016] Preferably, in step three, the support is changed to an inclined setting, and the distance from the top of the support to the working face is less than the distance from the bottom of the support to the working face; in step four, the support is gradually dismantled.

[0017] Preferably, in step two, the reinforcing support members fixedly installed at the joint between the first end of the first beam and the first end of the second beam are a third canopy leg and a column. The top of the third canopy leg can contact the first end of the first beam to support the first end of the first beam. The column is set vertically, and the top of the column can contact the first end of the second beam to support the first end of the second beam.

[0018] Preferably, in step three, the support pillar is removed; in step four, the third canopy leg is gradually removed.

[0019] Preferably, the splicing top beam in step two also includes two connecting steel plates, which are respectively placed on both sides of the first beam. One end of the two connecting steel plates is connected to the first end of the first beam by bolts, and the other end of the two connecting steel plates is connected to the first end of the second beam by bolts.

[0020] Preferably, the width of the second beam is smaller than the width of the first beam.

[0021] Preferably, the width of the second beam is 200mm larger than the width of the concrete wall in step three.

[0022] The present invention also provides a steel canopy, which is applied to the roadway support method described above, including a first canopy leg, a second canopy leg, a spliced ​​top beam, and a reinforcing support member. The first canopy leg is used for fixed installation along the working side of the roadway, and the second canopy leg is used for fixed installation along the non-working side of the roadway. The spliced ​​top beam is fixedly installed at the top of the first canopy leg and the top of the second canopy leg. The reinforcing support member is placed below the splice of the spliced ​​top beam and can support the spliced ​​top beam.

[0023] The present invention achieves the following technical effects compared to the prior art:

[0024] The roadway support method and steel canopy provided by this invention adopt a spliced ​​roof beam, and reinforced support components are fixedly installed at the splice joints of the spliced ​​roof beams to strengthen the support at the splice joints and ensure the safety of the roadway support. In the initial stage of roadway excavation, spliced ​​roof beams are used in conjunction with reinforced support components for support. After roadway excavation, continuous concrete walls are poured along the non-working side of the roadway. During the advancement of the longwall face, the first canopy leg and the first beam in the spliced ​​roof beam are gradually removed. Under the premise of ensuring the strength and stability of the roadway support, this invention solves the problem of the inability to recover the roof beam when using the precast concrete roadway excavation technology along the goaf in the re-mining area. It is more suitable for the geological conditions of roadways in the re-mining area. It is not only easy to operate, improves construction efficiency, and increases the safety factor of the roadway support, but also greatly improves the recycling rate of support materials, reduces material waste, and ensures the maximization of coal mine benefits. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram illustrating the implementation of the tunnel support method in Embodiment 1 of the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the cross section at point AA;

[0028] Figure 3 for Figure 1 Schematic diagram of the cross section at point BB;

[0029] Figure 4 for Figure 1 Cross-sectional view at point CC;

[0030] Figure 5 This is a schematic diagram showing the connection between the third canopy leg and the support column in Example 2;

[0031] In the diagram: 1-Ground roadway of the longwall face, 2-First support leg, 3-Second support leg, 4-Support column, 5-Concrete wall, 6-First beam, 7-Second beam, 8-Third support leg. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a roadway support method and steel shed to solve the problems existing in the prior art. It is more suitable for the geological conditions of roadways in re-mining areas. It is not only easy to operate and improves construction efficiency and the safety factor of roadway support, but also greatly improves the recycling rate of support materials, reduces material waste, and ensures the maximization of coal mine benefits.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figures 1 to 4 As shown, this embodiment provides a tunnel support method, including the following steps:

[0037] Step 1: Begin excavation and mining of the longwall face roadway 1;

[0038] Step 2: Fix the first canopy leg 2 along the working side of the roadway, fix the second canopy leg 3 along the non-working side of the roadway, fix the splicing top beam at the top of the first canopy leg 2 and the top of the second canopy leg 3, and fix the reinforcing support at the splicing point of the splicing top beam;

[0039] Step 3: Construct a continuous concrete wall 5 along the non-working side of the roadway at the delayed excavation face;

[0040] Step 4: During the advance of the longwall face, gradually dismantle the first support leg 2 and the first beam 6 in the spliced ​​roof beam;

[0041] Step 5: Excavate the next section of the longwall face 1 on the back side of the concrete wall 5.

[0042] The roadway support method provided in this embodiment adopts spliced ​​roof beams and fixedly installs reinforcing supports at the splice joints of the spliced ​​roof beams to strengthen the support at the splice joints and ensure the safety of the roadway support. In the early stage of roadway excavation, spliced ​​roof beams are used in conjunction with reinforcing supports for support. After roadway excavation, a continuous concrete wall 5 is poured along the non-working side of the roadway. During the advancement of the longwall face, the first support leg 2 and the first beam 6 in the spliced ​​roof beams are gradually removed. Under the premise of ensuring the strength and stability of the roadway support, this method solves the problem of the inability to recover the roof beams when using the precast concrete roadway excavation technology in the re-mining area. It is more suitable for the geological conditions of roadways in the re-mining area. It is not only easy to operate and improves construction efficiency and the safety factor of the roadway support, but also greatly improves the recycling rate of support materials, reduces material waste, and ensures the maximization of coal mine benefits.

[0043] It should be noted that the back side of the concrete wall 5 is the side of the concrete wall 5 that faces away from the longwall face 1 in step one.

[0044] In step five, it is preferred, but not limited, to change the angle of the second support leg 3 for use in the support of the roadway 1 of the next section of the longwall face; the first support leg 2 recovered in step four and the first beam 6 in the spliced ​​top beam are also preferred, but not limited, for use in the support of the roadway 1 of the next section of the longwall face.

[0045] As a preferred embodiment of this example, the splicing top beam in step two includes a first beam 6 and a second beam 7. The first end of the first beam 6 and the first end of the second beam 7 are detachably fixedly connected. The width of the second beam 7 is greater than the width of the concrete wall 5 in step three. The concrete wall 5 in step three is placed below the second beam 7 so as to facilitate the disconnection between the first end of the first beam 6 and the first end of the second beam 7.

[0046] In a preferred embodiment of this invention, in step two, the reinforcing support member fixedly installed at the joint between the first end of the first beam 6 and the first end of the second beam 7 is a column 4. The column 4 is vertically arranged, and the top of the column 4 can contact the first end of the first beam 6 and the first end of the second beam 7 to support the first end of the first beam 6 and the first end of the second beam 7, so as to support the joint of the spliced ​​top beam.

[0047] As a preferred embodiment of this example, in step three, the support column 4 is changed to be inclined, and the distance from the top of the support column 4 to the working face is less than the distance from the bottom of the support column 4 to the working face. It forms a new steel canopy with the first canopy leg 2 and the first beam 6, and together with the concrete wall 5, it supports the roof of the roadway. In step four, the support column 4 is gradually dismantled to realize the recovery of the support column 4.

[0048] As a preferred embodiment of this example, the splicing roof beam in step two also includes two connecting steel plates. The two connecting steel plates are respectively placed on both sides of the first beam body 6. One end of the two connecting steel plates is connected to the first end of the first beam body 6 by bolts, and the other end of the two connecting steel plates is connected to the first end of the second beam body 7 by bolts. The bolts of the splicing roof beam are removed from the advanced mining face. As the mining face advances, the first support leg 2, the support column 4 and the first beam body 6 in the splicing roof beam are gradually recovered in the roadway.

[0049] In a preferred embodiment of this invention, the width of the second beam 7 is smaller than the width of the first beam 6, so as to improve the recycling rate of the spliced ​​top beam.

[0050] In a preferred embodiment of this invention, the width of the second beam 7 is 200mm larger than the width of the concrete wall 5 in step three, so as to facilitate the disconnection between the first end of the first beam 6 and the first end of the second beam 7.

[0051] As a preferred embodiment of this invention, the first canopy leg 2, the second canopy leg 3, the first beam 6, the second beam 7, and the support column 4 are all made of I-beams, which facilitates manufacturing and use.

[0052] As a preferred embodiment of this invention, the first beam 6, the second beam 7, and the support column 4 are of the same type to facilitate the support of the splicing joint of the top beam.

[0053] Example 2

[0054] like Figure 5 As shown, this embodiment provides a roadway support method. Unlike the reinforced support used in the roadway support method of Embodiment 1, in this embodiment, in step two, the reinforced support fixedly installed at the joint between the first end of the first beam 6 and the first end of the second beam 7 is a third support leg 8 and a support column 4. The top of the third support leg 8 can contact the first end of the first beam 6 to support the first end of the first beam 6. The support column 4 is vertically arranged, and the top of the support column 4 can contact the first end of the second beam 7 to support the first end of the second beam 7, thereby increasing the load-bearing capacity of the first end of the first beam 6 and the first end of the second beam 7. This method is particularly suitable for roadway conditions with broken surrounding rock or high surrounding rock pressure.

[0055] In a preferred embodiment of this invention, in step three, the support column 4 is dismantled to achieve the recovery of the support column 4; in step four, the third canopy leg 8 is gradually dismantled to achieve the recovery of the third canopy leg 8.

[0056] Example 3

[0057] This embodiment provides a steel canopy, which is applied to the roadway support method in Embodiment 1 or Embodiment 2. It includes a first canopy leg 2, a second canopy leg 3, a spliced ​​top beam, and a reinforcing support. The first canopy leg 2 is used for fixed installation along the working side of the roadway, and the second canopy leg 3 is used for fixed installation along the non-working side of the roadway. The spliced ​​top beam is fixedly installed at the top of the first canopy leg 2 and the top of the second canopy leg 3. The reinforcing support is placed below the splice of the spliced ​​top beam and can support the spliced ​​top beam.

[0058] The steel canopy provided in this embodiment adopts a spliced ​​top beam, and reinforced support components are fixedly installed at the splice joints of the spliced ​​top beams to strengthen the support at the splice joints and ensure the safety of the roadway support. In the early stage of roadway excavation, spliced ​​top beams are used in conjunction with reinforced support components for support. After roadway excavation, a continuous concrete wall 5 is poured along the non-working side of the roadway. During the advancement of the longwall face, the first canopy leg 2 and the first beam 6 in the spliced ​​top beam are gradually removed. Under the premise of ensuring the strength and stability of the roadway support, this embodiment solves the problem that the top beam cannot be recovered when using the precast concrete roadway excavation technology in the re-mining area. It is more suitable for the geological conditions of the roadway in the re-mining area. It is not only easy to operate and improves construction efficiency and the safety factor of the roadway support, but also greatly improves the recycling rate of support materials, reduces material waste, and ensures the maximization of coal mine benefits.

[0059] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for roadway support, characterized in that: Includes the following steps: Step 1: Begin excavating the longwall face in the remining area; Step 2: Fix the first canopy leg along the working side of the roadway, fix the second canopy leg along the non-working side of the roadway, fix the splicing top beam at the top of the first and second canopy legs, and fix the reinforcing support at the splicing joint of the splicing top beam; Step 3: Construct a continuous concrete wall along the non-working side of the roadway at the delayed excavation face; Step 4: During the advance of the longwall face, gradually dismantle the first support leg and the first beam in the spliced ​​roof beam; Step 5: On the back side of the concrete wall, excavate the next section of the longwall face in the same direction as the excavation direction in Step 1. The splicing beam in step two includes a first beam and a second beam. The first end of the first beam and the first end of the second beam are detachably fixedly connected. The width of the second beam is greater than the width of the concrete wall in step three. The concrete wall in step three is placed below the second beam.

2. The tunnel support method according to claim 1, characterized in that: In step two, a reinforcing support member is fixedly installed at the joint between the first end of the first beam and the first end of the second beam. The support is vertically set and its top end can contact the first end of the first beam and the first end of the second beam to support the first end of the first beam and the first end of the second beam.

3. The tunnel support method according to claim 2, characterized in that: In step three, the support pillars are changed to be installed at an angle, with the distance from the top of the support pillar to the working face being less than the distance from the bottom of the support pillar to the working face; in step four, the support pillars are gradually dismantled.

4. The tunnel support method according to claim 1, characterized in that: In step two, the reinforcing support members fixedly installed at the joint between the first end of the first beam and the first end of the second beam are a third canopy leg and a column. The top of the third canopy leg can contact the first end of the first beam to support the first end of the first beam. The column is set vertically, and the top of the column can contact the first end of the second beam to support the first end of the second beam.

5. The tunnel support method according to claim 4, characterized in that: In step three, the support pillars are removed; in step four, the third canopy leg is gradually removed.

6. The tunnel support method according to claim 1, characterized in that: The splicing top beam in step two also includes two connecting steel plates. The two connecting steel plates are placed on both sides of the first beam body. One end of the two connecting steel plates is connected to the first end of the first beam body by bolts, and the other end of the two connecting steel plates is connected to the first end of the second beam body by bolts.

7. The tunnel support method according to claim 1, characterized in that: The width of the second beam is smaller than the width of the first beam.

8. The tunnel support method according to claim 1, characterized in that: The width of the second beam is 200mm larger than the width of the concrete wall in step three.

9. A steel shed, applied to the roadway support method as described in any one of claims 1 to 8, characterized in that: It includes a first canopy leg, a second canopy leg, a splicing top beam, and a reinforcing support. The first canopy leg is used for fixed installation along the working side of the roadway, and the second canopy leg is used for fixed installation along the non-working side of the roadway. The splicing top beam is fixedly installed at the top of the first canopy leg and the top of the second canopy leg. The reinforcing support is placed below the splicing point of the splicing top beam and can support the splicing top beam.

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