Roof supporting mesh for roadway

Abstract

The utility model provides a roadway roof supporting mesh, and belongs to the technical field of coal mine roadway surrounding rock roof supporting. The metal net comprises metal wires, and a plurality of metal wires are hooked with one another to form the metal net with rhombic grids; the rectangular steel bar framework comprises a rectangular frame and a reinforcing steel bar group, and the reinforcing steel bar group is arranged on the rectangular frame; the metal net is laid on the rectangular steel bar framework, and the lap joint position formed by the metal net and the rectangular steel bar framework is bound and fixed through galvanized lead wires. The metal net and the rectangular steel bar framework are combined, the flexible supporting effect of the rhombic grid galvanized metal net is achieved, meanwhile, the supporting rigidity and strength of the rectangular steel bar framework are achieved, the supporting rigidity and strength are ensured, and supporting is safer and more reliable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal mine roadway surrounding rock roof support, and particularly relates to a roadway roof support mesh. BACKGROUND

[0002] In related technologies, the mesh for supporting the coal mine roadway surrounding rock roof is made of cold-drawing process steel mesh, lead wire mesh, rectangular grid-shaped round steel mesh and plastic mesh.

[0003] When the cold-drawing process steel mesh is used to support the surrounding rock of the roof, it needs to be used in cooperation with the coal mine pre-stressed anchor rod; the cold-drawing process steel mesh usually adopts cold-drawing wire with a diameter of 4mm to 6.5mm, and the yield strength and tensile strength thereof are relatively low, and the corrosion resistance is poor. Therefore, it is not suitable for extremely broken composite roof surrounding rock or soft rock roadway roof surrounding rock.

[0004] The lead wire mesh is suitable for supporting the coal mine roadway surrounding rock of the side of the roadway; since the lead wire mesh is usually woven by thin lead wire, the structural strength thereof is relatively low, and it is in a roll type, and it is difficult to fix and operate during construction. Therefore, it is not suitable for extremely broken composite roof surrounding rock or soft rock roadway roof surrounding rock.

[0005] The plastic mesh is suitable for supporting the coal mine surrounding rock of the side of the working face; since the plastic mesh is woven by high molecular polyethylene, the structural strength thereof is low, and it is in a roll type, and it is difficult to fix and operate during construction. Therefore, it is not suitable for extremely broken composite roof surrounding rock or soft rock roadway roof surrounding rock.

[0006] The rectangular grid-shaped round steel mesh is usually woven by round steel with a diameter of 6.5mm, and the flexibility thereof is poor, and it is difficult to adapt to the irregular shape of the roof and the complex geological conditions, and the manufacturing cost and weight thereof are high. Therefore, it is not suitable for extremely broken composite roof surrounding rock or soft rock roadway roof surrounding rock. CONTENT OF THE INVENTION

[0007] Therefore, the purpose of the present application is to provide a roadway roof support mesh, which at least solves one of the technical problems mentioned in the background.

[0008] In order to solve the above problems, the present application provides a roadway roof support mesh, which comprises a metal mesh and a rectangular steel reinforcement framework; the metal mesh comprises metal wires, and a plurality of metal wires are interconnected to form a diamond-shaped mesh; the rectangular steel reinforcement framework comprises a rectangular frame and a reinforcing steel group, and the reinforcing steel group is arranged on the rectangular frame; the metal mesh is laid on the rectangular steel reinforcement framework, and the overlapping part of the metal mesh and the rectangular steel reinforcement framework is fixed by galvanized lead wire binding.

[0009] Optionally, the rectangular frame and the reinforcing steel bar group are welded by round steel with yield strength not less than 345 MPa.

[0010] Optionally, the rectangular frame comprises edge longitudinal steel bars and edge transverse steel bars, the edge longitudinal steel bars and the edge transverse steel bars are alternately arranged and welded to form the rectangular frame.

[0011] Optionally, the rectangular frame further comprises longitudinal steel bars, the longitudinal steel bars are arranged close to one of the edge longitudinal steel bars to form double-steel-bar edges, and the other edge longitudinal steel bar is a single-steel-bar edge.

[0012] Optionally, the rectangular frame further comprises connecting short steel bars, the two connecting short steel bars are arranged between the edge longitudinal steel bars and the longitudinal steel bars, respectively.

[0013] Optionally, the reinforcing steel bar group comprises middle longitudinal steel bars and middle transverse steel bars, the middle longitudinal steel bars and the middle transverse steel bars are cross-welded and fixed;

[0014] The spacing between the connecting short steel bars and the edge transverse steel bars is less than the spacing between the connecting short steel bars and the middle transverse steel bars.

[0015] Optionally, the geometric center of the reinforcing steel bar group coincides with the geometric center of the rectangular frame.

[0016] Optionally, the spacing between the adjacent galvanized lead wires bound on the edge longitudinal steel bars, the edge transverse steel bars, the middle longitudinal steel bars, the middle transverse steel bars and the longitudinal steel bars is 25 cm to 30 cm.

[0017] Optionally, the intersection points of the edge longitudinal steel bars and the edge transverse steel bars, the intersection points of the longitudinal steel bars and the edge transverse steel bars, the intersection points of the middle longitudinal steel bars and the edge transverse steel bars, the intersection points of the middle transverse steel bars and the edge longitudinal steel bars, the intersection points of the connecting short steel bars and the edge longitudinal steel bars, and the intersection points of the connecting short steel bars and the longitudinal steel bars are all connected by four-point welding.

[0018] Optionally, the metal wires comprise galvanized low-carbon steel wires or galvanized stainless steel wires.

[0019] By means of the above technical solution, the present application has at least the following beneficial effects:

[0020] The embodiment of the present application provides a roadway roof supporting mesh, which combines a diamond-shaped grid galvanized metal mesh with a rectangular steel framework, has a diamond-shaped grid galvanized metal mesh "flexible" supporting effect, has good elasticity and flexibility, can be deformed to a certain extent without being easily broken when subjected to external force impact, and can effectively buffer external force. Meanwhile, the metal mesh is subjected to galvanizing treatment, so that a zinc protective layer can be formed on the surface of the steel wire, the corrosion resistance of the metal mesh is effectively improved, the metal mesh can be used for a long time in a humid and easily-corroded environment in a coal mine, the service life is prolonged, and the safety and stability of coal mine production are ensured. The rectangular steel framework is welded from a round steel with a yield strength of not less than 345MPa, can withstand greater external force without plastic deformation, ensures supporting rigidity and supporting strength, and is safer and more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The roadway roof supporting mesh is an embodiment of the present application.

[0022] Figure 2 The mesh application schematic diagram is an embodiment of the present application.

[0023] The signs are as follows:

[0024] 1, metal mesh;

[0025] 2, rectangular steel framework; 201, longitudinal steel bars; 202, edge longitudinal steel bars; 203, edge transverse steel bars; 204, middle longitudinal steel bars; 205, middle transverse steel bars; 206, connecting short steel bars;

[0026] 3, galvanized lead wire. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited.

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] The preferred embodiments of the present application are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0031] In conjunction with Figure 1 and Figure 2 According to the embodiments of the present application, a roadway roof support mesh is provided, which comprises a metal mesh 1 and a rectangular steel reinforcement framework 2. The metal mesh 1 comprises metal wires, and a plurality of metal wires are interconnected to form a diamond mesh metal mesh 1. The rectangular steel reinforcement framework 2 comprises a rectangular frame and a reinforcing steel group, and the reinforcing steel group is arranged on the rectangular frame. The metal mesh 1 is laid on the rectangular steel reinforcement framework 2, and the overlapping part formed by the metal mesh 1 and the rectangular steel reinforcement framework 2 is fixed by galvanized lead wire 3.

[0032] The diamond mesh galvanized metal mesh 1 is combined with the rectangular steel reinforcement framework 2, has the "flexible" supporting effect of the diamond mesh galvanized metal mesh 1, has good elasticity and flexibility, and can deform to a certain extent without being easily broken when subjected to external force impact, which can effectively buffer the external force. At the same time, the metal mesh 1 is treated by galvanizing, which can form a zinc protective layer on the surface of the steel wire, effectively improve the corrosion resistance of the metal mesh 1, so that it can be used in the humid and easily corroded environment of the coal mine for a long time, prolong the service life, and ensure the safety and stability of the coal mine production. The rectangular steel reinforcement framework 2 is welded by round steel with a yield strength not less than 345MPa, which can withstand greater external force without plastic deformation, ensuring the supporting rigidity and supporting strength, and the support is more safe and reliable.

[0033] The specification of the diamond grid of the metal net 1 is 4mm*4mm, and the size of the metal net 1 is 5100mm*1200mm. The diamond grid of the metal net 1 is processed to have certain adhesion, so as to timely hinder and hold the roof scale and prevent the gangue from falling and hurting the personnel.

[0034] The size of the rectangular steel reinforcement framework 2 is 5100mm*1200mm, which is the same as the size of the metal net 1.

[0035] In another embodiment, the rectangular frame and the reinforcing steel group are both welded by round steel with yield strength not less than 345MPa. The yield strength is the maximum stress that the material can withstand, and the material starts to deform plastically at this strength. The yield strength not less than 345MPa means that the round steel can keep the structure stable when bearing a larger external force. At the same time, it is not easy to deform during the force process, and its geometric shape can remain relatively stable. Further, it further ensures the rigidity and strength of the coal mine roadway roof support, and further improves the reliability and safety.

[0036] In another embodiment, the rectangular frame includes edge longitudinal steel bars 202 and edge transverse steel bars 203, and the edge longitudinal steel bars 202 and the edge transverse steel bars 203 are alternately arranged and welded to form the rectangular frame.

[0037] In the embodiment, the edge longitudinal steel bars 202 and the edge transverse steel bars 203 are both two; the two edge longitudinal steel bars 202 and the two edge transverse steel bars 203 are alternately arranged and welded to form the rectangular frame.

[0038] In another embodiment, the rectangular frame further includes a longitudinal steel bar 201, and the longitudinal steel bar 201 is arranged close to one of the edge longitudinal steel bars 202 to form a double-steel-bar edge, and the other edge longitudinal steel bar 202 is a single-steel-bar edge.

[0039] When the two adjacent support meshes are overlapped, the single-steel-bar edge of the second support mesh is overlapped at the double-steel-bar edge of the first support mesh, and it is ensured that the single-steel-bar edge of the second support mesh is located on the center line of symmetry of the double-steel-bar edge of the first support mesh.

[0040] In another embodiment, the rectangular frame further includes connecting short steel bars 206, and the two connecting short steel bars 206 are respectively arranged between the edge longitudinal steel bars 202 and the longitudinal steel bar 201. The structure stability of the double-steel-bar edge is improved by the arrangement of the connecting short steel bars 206.

[0041] In another embodiment, the reinforcing steel group includes a middle longitudinal steel bar 204 and a middle transverse steel bar 205, and the middle longitudinal steel bar 204 and the middle transverse steel bar 205 are cross-welded and fixed;

[0042] The spacing between the connecting short steel bars 206 and the edge transverse steel bars 203 is smaller than the spacing between the connecting short steel bars 206 and the middle transverse steel bars 205.

[0043] The middle longitudinal steel bars 204 and the middle transverse steel bars 205 are cross-welded and fixed, which ensures the uniformity of the stress on the reinforcing steel bar group and avoids the phenomenon of local supporting stress concentration.

[0044] The edge is a relatively weak area in the rectangular frame and is easily affected by stress concentration and external impact. By designing the spacing between the connecting short steel bars 206 and the edge transverse steel bars 203 to be smaller than the spacing between the connecting short steel bars 206 and the middle transverse steel bars 205, the steel bar density of the edge can be increased, thereby improving the shear capacity and bending capacity of the edge.

[0045] In another embodiment, the geometric center of the reinforcing steel bar group coincides with the geometric center of the rectangular frame. When the geometric center of the reinforcing steel bar group coincides with the geometric center of the rectangular frame, the reinforcing steel bar group and the rectangular frame can work together to resist bending moments when the supporting mesh is subjected to bending moments, effectively improving the bending stiffness of the structure and reducing bending deformation.

[0046] In another embodiment, the spacing between the edge longitudinal steel bars 202, the edge transverse steel bars 203, the middle longitudinal steel bars 204, the middle transverse steel bars 205, and the adjacent galvanized lead wires 3 bound on the longitudinal steel bars 201 is 25cm-30cm. The purpose of setting the spacing between the adjacent galvanized lead wires 3 is to ensure the close combination of the diamond-shaped galvanized metal mesh 1 and the rectangular steel reinforcement framework 2, optimize stress transmission, improve construction convenience and economy, and at the same time, enhance the durability and service life of the supporting mesh. This design has important practical significance in the coal mine roadway roof support, which can effectively improve the supporting effect and construction efficiency and reduce the supporting cost.

[0047] In this embodiment, the spacing between the adjacent galvanized lead wires 3 is 30cm, and the diameter of the galvanized lead wire 3 is φ4mm.

[0048] In another embodiment, four-point welding connection is adopted at the intersection points of the edge longitudinal steel bars 202 and the edge transverse steel bars 203, the intersection points of the longitudinal steel bars 201 and the edge transverse steel bars 203, the intersection points of the middle longitudinal steel bars 204 and the edge transverse steel bars 203, the intersection points of the middle transverse steel bars 205 and the edge longitudinal steel bars 202, the intersection points of the connecting short steel bars 206 and the edge longitudinal steel bars 202, and the intersection points of the connecting short steel bars 206 and the longitudinal steel bars 201.

[0049] The four-point welding method, by welding in four directions at the intersection of the round steel bars, can significantly improve the strength and rigidity of the joint. Compared with single-point or double-point welding, four-point welding can more effectively fix the crisscrossing round steel bars together, forming a more robust rectangular steel reinforcement skeleton. This enhanced joint strength can effectively resist external forces and improve the stability of the entire support mesh.

[0050] Four-point welding ensures that stress is evenly distributed at the intersections of the round steel bars. When subjected to external forces, the stress can be evenly transferred through the four weld points, avoiding localized stress concentration and reducing joint damage caused by stress concentration. This uniform stress distribution improves the overall performance of the structure, enabling it to remain stable in complex stress environments.

[0051] In another embodiment, the metal wire includes galvanized low-carbon steel wire or galvanized stainless steel wire.

[0052] The manufacturing process of the support mesh is as follows:

[0053] Metal mesh 1, in which metal wires are interlocked to form a diamond-shaped grid;

[0054] The metal wire is made of #8 galvanized stainless steel, meaning it has a diameter of 4mm. The diamond mesh size is 4mm x 4mm. The dimensions of metal mesh 1 are 5100mm x 1200mm. The diameter of the metal wire can be adjusted according to specific construction requirements.

[0055] Arrange the edge longitudinal reinforcement 202, edge transverse reinforcement 203, middle longitudinal reinforcement 204, middle transverse reinforcement 205, longitudinal reinforcement 201, and connecting short reinforcement 206 according to... Figure 1 The steel reinforcement is arranged in a crisscross pattern as shown; at the intersection points, it is welded together in a four-point manner to form a rectangular steel reinforcement frame 2;

[0056] Among them, the edge longitudinal reinforcement 202, edge transverse reinforcement 203, middle longitudinal reinforcement 204, middle transverse reinforcement 205, longitudinal reinforcement 201, and connecting short reinforcement 206 are all made of round steel with a diameter of 10mm; the size of the rectangular reinforcement cage 2 is 5100mm×1200mm.

[0057] The metal mesh 1 is laid on the rectangular steel frame 2, and then tied with No. 8 galvanized wire 3 every 30cm to fix the metal mesh 1 on the rectangular steel frame 2, thus making a support mesh.

[0058] The rectangular steel reinforcement framework 2 is combined with the flexible metal net 1 to form a piece of supporting net, and the supporting effects of the rectangular steel reinforcement framework 2 and the metal net 1 are exerted. The rectangular steel reinforcement framework 2 provides a fixed shape for the whole metal net 1, which facilitates the underground workers to carry the whole supporting net from the roadway ground to the roadway roof for roof supporting. The problem of carrying the supporting net from the ground to the roof is solved, the labor efficiency is improved, and the efficient and safe operation effect in construction is realized. The metal net 1 has good elasticity and flexibility, and can be deformed under external force impact without being easily broken, which can effectively buffer the external force. Meanwhile, the metal net 1 is treated by galvanizing to form a zinc protective layer on the surface of the metal wire, which effectively improves the corrosion resistance of the metal net 1, so that the metal net 1 can be used in the humid and easily-corroded environment of the coal mine for a long time, the service life is prolonged, and the safety and stability of the coal mine production are ensured.

[0059] Those skilled in the art can understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0060] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. A type of roadway roof support mesh, characterized in that, include: Metal mesh (1), the metal mesh (1) includes metal wires, and multiple metal wires are interlocked to form a diamond-shaped mesh. A rectangular steel reinforcement cage (2) includes a rectangular frame and a group of reinforcing bars, wherein the group of reinforcing bars is disposed on the rectangular frame; The metal mesh (1) is laid on the rectangular steel reinforcement frame (2), and the overlap between the metal mesh (1) and the rectangular steel reinforcement frame (2) is fixed by galvanized lead wire (3).

2. The tunnel roof support mesh according to claim 1, characterized in that, Both the rectangular frame and the reinforcing steel reinforcement group are welded from round steel with a yield strength of not less than 345 MPa.

3. The tunnel roof support mesh according to claim 1, characterized in that, The rectangular frame includes longitudinal reinforcing bars (202) and transverse reinforcing bars (203) at the edges, which are alternately arranged and welded to form the rectangular frame.

4. The tunnel roof support mesh according to claim 3, characterized in that, The rectangular frame also includes longitudinal steel bars (201), which are arranged near one of the edge longitudinal steel bars (202) to form a double steel bar side, while the other edge longitudinal steel bar (202) is a single steel bar side.

5. A tunnel roof support mesh according to claim 4, characterized in that, The rectangular frame also includes connecting short steel bars (206), with two connecting short steel bars (206) respectively disposed between the edge longitudinal steel bars (202) and the longitudinal steel bars (201).

6. The tunnel roof support mesh according to claim 5, characterized in that, The reinforcing steel bar group includes a central longitudinal steel bar (204) and a central transverse steel bar (205), and the central longitudinal steel bar (204) and the central transverse steel bar (205) are fixed by cross-welding. The distance between the connecting short steel bar (206) and the edge transverse steel bar (203) is less than the distance between the connecting short steel bar (206) and the middle transverse steel bar (205).

7. A tunnel roof support mesh according to claim 6, characterized in that, The geometric center of the reinforcing steel bar group coincides with the geometric center of the rectangular frame.

8. A tunnel roof support mesh according to claim 6, characterized in that, The spacing between adjacent galvanized lead wires (3) tied to the edge longitudinal reinforcement (202), the edge transverse reinforcement (203), the middle longitudinal reinforcement (204), the middle transverse reinforcement (205), and the longitudinal reinforcement (201) is 25cm~30cm.

9. A tunnel roof support mesh according to claim 6, characterized in that, The intersections of the edge longitudinal reinforcement (202) and the edge transverse reinforcement (203), the intersections of the longitudinal reinforcement (201) and the edge transverse reinforcement (203), the intersections of the middle longitudinal reinforcement (204) and the edge transverse reinforcement (203), the intersections of the middle transverse reinforcement (205) and the edge longitudinal reinforcement (202), the intersections of the connecting short reinforcement (206) and the edge longitudinal reinforcement (202), and the intersections of the connecting short reinforcement (206) and the longitudinal reinforcement (201) are all connected by four-point welding.

10. A tunnel roof support mesh according to claim 1, characterized in that, The metal wire includes galvanized low-carbon steel wire or galvanized stainless steel wire.

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