Supporting structure for floor heave treatment of coal mine tunnel and construction method of supporting structure

Abstract

The invention discloses a supporting structure for floor heave treatment of a coal mine roadway, which comprises a supporting structure formed by arranging a plurality of reinforcing bar strip inverted arches and a plurality of plain concrete strip inverted arches at intervals, and the supporting structure is arranged on a roadway bottom plate of the roadway along the length direction of the roadway; according to the steel bar strip inverted arch, steel bar arch arrangement is completed according to requirements before concrete pouring, then concrete is poured, and the concrete and the steel bar arch jointly form the steel bar strip type inverted arch. The plain concrete strip inverted arch is a plain concrete strip type supporting inverted arch formed by pouring concrete. The invention further discloses a construction method of the supporting structure for coal mine roadway floor heave treatment. The strength and the bearing capacity of the bottom plate are enhanced through the rib strip inverted arches, the plain concrete strip inverted arches with low strength serve as roadway pressure relief openings for pressure relief, the mechanism of combination of resistance and relief is achieved, the deformation of the roadway bottom plate is effectively reduced, and the influence of floor heave on mine production and safety is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining support, relates to a support structure for coal mine tunnel floor heave control, and also relates to a construction method of the support structure for coal mine tunnel floor heave control. Background Art

[0002] Floor heave is a dynamic phenomenon that often occurs in coal mines. In coal mine production, the tunnels will experience floor heave to varying degrees. However, for mines that are deeply buried and greatly affected by the structure, the ground stress increases accordingly, and the floor heave phenomenon is more serious. The tunnel floor heave will lead to a reduction in the tunnel section, hinder transportation and pedestrians, and hinder mine ventilation, which will have a great impact on mine production and safety.

[0003] The prevention and control measures for tunnel floor heave can be divided into two aspects: On the one hand, the part of the tunnel that has bottom heave is removed, that is, the bottom is lifted, which is a method of controlling tunnel floor heave that is currently widely used on site. This method is a passive measure to control bottom heave. For tunnels with strong bottom heave tendency, it is often necessary to lift the bottom several times, but it cannot completely stop the bottom heave. Not only is the lifting work large and expensive, but it also affects the stability of the rock formations on both sides and the roof and the normal production of the mine. Another method of controlling tunnel floor heave is to take measures to eliminate the bottom heave, that is, to reinforce the surrounding rock of the tunnel or take measures to maintain the strength of the surrounding rock to eliminate the bottom heave. Summary of the invention

[0004] The first object of the present invention is to provide a support structure for coal mine tunnel floor heave control, to reinforce and support the tunnel floor, so as to reduce the impact of floor heave on mine production and safety.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is a supporting structure for coal mine tunnel floor heave control, comprising a supporting structure composed of a plurality of steel strip anti-arches and a plurality of plain concrete strip anti-arches arranged at intervals, wherein the supporting structure is arranged on the bottom plate of the tunnel along the length direction of the tunnel; the steel strip anti-arch is a steel strip type anti-arch formed by the arrangement of the steel strip arches as required before concrete pouring, and then the concrete is poured, and the concrete and the steel strip arches together constitute a steel strip type anti-arch; the plain concrete strip anti-arch is a plain concrete strip type support anti-arch formed by concrete pouring.

[0006] The technical solution of the present invention also has the following characteristics: As a preferred solution of the technical solution of the present invention, the width of the reverse arch of the steel bar strip is not less than the width of the reverse arch of the plain concrete strip.

[0007] The second object of the present invention is to provide a method for constructing a support structure for coal mine tunnel floor heave control, to reinforce and support the tunnel floor, so as to reduce the impact of floor heave on mine production and safety.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is a method for constructing a support structure for coal mine tunnel floor heave control, which is specifically implemented according to the following steps: Step 1: As the tunnel is excavated or after the tunnel is excavated once, the tunnel floor is excavated as required; at the same time, the main reinforcement and stirrups of the reinforced arch are prepared and transported to the underground use site; Step 2, for the strips of the tunnel floor where the steel arch needs to be arranged, the main steel arch bars and the steel arch stirrups are arranged in sequence; the steel arch main bars are four, distributed at the four corners of the steel arch; the steel arch stirrups are evenly arranged around the main steel arch bars along the longitudinal direction of the steel arch at a certain interval; the main steel arch bars and the steel arch stirrups are connected to form an integral steel arch; Step 3, arranging a plurality of steel bar arches in each of the steel bar strip inverted arches, isolating the steel bar strip inverted arches and the plain concrete strip inverted arches with templates on both sides of the steel bar strip inverted arches to form a closed strip casting space; Step 4, pouring concrete on the steel bar strip anti-arch and the plain concrete strip anti-arch in turn. After the concrete pouring of the steel bar strip anti-arch and the plain concrete strip anti-arch is completed, a support structure composed of the steel bar strip anti-arch and the plain concrete strip anti-arch is formed on the tunnel floor.

[0009] The technical solution of the present invention also has the following characteristics: As a preferred embodiment of the technical solution of the present invention, the concrete used for pouring is mixed according to a set mix ratio, poured on site and vibrated to make it dense.

[0010] As a preferred solution of the technical solution of the present invention, the strength of concrete used for the reverse arch of the steel bar strip is not lower than the strength of concrete used for the reverse arch of the plain concrete strip.

[0011] The beneficial effect of the present invention is that the present invention provides a support structure for coal mine tunnel floor heave control and a construction method thereof, wherein steel strip counter-arches and plain concrete strip counter-arches are arranged at intervals on the tunnel floor to reinforce and support the coal mine tunnel floor, the steel strip counter-arches enhance the strength and bearing capacity of the floor, and the low-strength plain concrete strip counter-arches are used as tunnel pressure relief ports for pressure relief, thereby realizing a mechanism of combining anti-relief and anti-relief, effectively reducing the deformation of the tunnel floor, and reducing the impact of floor heave on mine production and safety, and can be widely used in the treatment of floor heave in mining tunnels of coal mines and non-coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1It is a schematic diagram of a tunnel cross section of a supporting structure for treating floor heave in a coal mine provided by an embodiment of the present invention; Figure 2 The present invention provides a schematic plan view of a tunnel floor support structure for treating floor heave in a coal mine provided by an embodiment of the present invention.

[0013] In the figure, 1. tunnel, 2. steel bar strip anti-arch, 3. tunnel floor, 4. steel bar arch, 5. steel bar arch main reinforcement, 6. steel bar arch stirrups, 7. plain concrete strip anti-arch. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0015] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0016] Example 1 like Figure 1 and Figure 2 As shown, a support structure for coal mine tunnel floor heave control of the present invention is a support structure composed of steel bar strip inverted arches 2 and plain concrete strip inverted arches 7 arranged at intervals on the tunnel floor 3 of the tunnel 1 along the length direction of the tunnel.

[0017] The steel bar strip inverted arch 2 is formed by arranging the steel bar arch 4 as required before pouring concrete, and then pouring concrete, so that the concrete and the steel bar arch 4 together form a steel bar strip type inverted arch.

[0018] The plain concrete strip anti-arch 7 is a plain concrete strip type support anti-arch formed by pouring concrete; the support anti-arch is a support structure that is opposite in shape to the top plate support of the tunnel 1 and is mostly used for supporting the tunnel bottom plate 3; the width of the steel bar strip anti-arch ( Figure 2 B in the figure) is not less than the width of the plain concrete strip arch ( Figure 2 A in the figure) can ensure sufficient strength.

[0019] The support structure for coal mine roadway floor heave control of the present invention arranges steel bar strip anti-arches 2 and plain concrete strip anti-arches 7 at intervals on the roadway floor 3 to reinforce and support the coal mine roadway floor 3. The steel bar strip anti-arches 2 enhance the strength and bearing capacity of the floor, and the low-strength plain concrete strip 7 anti-arches serve as pressure relief ports for the roadway 1 to relieve pressure, thereby realizing a mechanism of combining anti-relief and anti-relief, effectively reducing the deformation of the roadway floor 3, and reducing the impact of floor heave on the production and safety of mines. The structure can be widely used for the control of floor heave in mining roadways of coal mines and non-coal mines.

[0020] Example 2 like Figure 1 and Figure 2 As shown, a method for constructing a support structure for coal mine tunnel floor heave control of the present invention is specifically implemented according to the following steps: Step 1, as the tunnel 1 is excavated or after the tunnel 1 is excavated once, the tunnel floor 3 is excavated as required; at the same time, the steel arch main reinforcement 5 and the steel arch stirrup 6 of the steel arch 4 are prepared and transported to the underground use site; Step 2, for the strips of the tunnel floor 3 where the steel arch 4 needs to be arranged, the steel arch main reinforcement 5 and the steel arch stirrups 6 are arranged successively; there are four steel arch main reinforcements 5, which are distributed at the four corners of the steel arch 4; the steel arch stirrups 6 are evenly arranged around the steel arch main reinforcement 5 along the longitudinal direction of the steel arch 4 at a certain interval; the steel arch main reinforcement 5 and the steel arch stirrups 6 are connected to form an integral steel arch 4; Step 3, arranging a plurality of steel bar arches 4 in each steel bar strip inverted arch 2, isolating the steel bar strip inverted arch 2 and the plain concrete strip inverted arch 7 with templates on both sides of the steel bar strip inverted arch 2 to form a closed strip casting space; Step 4, pouring concrete on the steel bar strip anti-arch 2 and the plain concrete strip anti-arch 7 in sequence. After the concrete pouring of the steel bar strip anti-arch 2 and the plain concrete strip anti-arch 7 is completed, a support structure composed of the steel bar strip anti-arch 2 and the plain concrete strip anti-arch 7 is formed on the tunnel floor.

[0021] Example 3 Different from Example 2, in the method for constructing a support structure for coal mine tunnel floor heave control of the present invention: The concrete used for pouring is mixed according to the set mix ratio, poured on site and vibrated to make it dense; The concrete strength used in the steel bar strip inverted arch 2 is not lower than the concrete strength used in the plain concrete strip inverted arch 7, which can ensure that the supporting structure has good strength.

[0022] The above description shows and describes several preferred embodiments of the invention, but as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and modifications made by those skilled in the art should be within the scope of protection of the claims attached to the invention without departing from the spirit and scope of the invention.

Claims

1. Support structure for floor heave control in coal mine tunnels, It is characterized in that The invention comprises a support structure composed of a plurality of steel bar strip inverted arches (2) and a plurality of plain concrete strip inverted arches (7) arranged at intervals, wherein the support structure is arranged on a tunnel floor (3) of a tunnel (1) along the length direction of the tunnel; the steel bar strip inverted arches (2) are arranged as required by the steel bar arches (4) before concrete pouring, and then concrete is poured, so that the concrete and the steel bar arches (4) together form a steel bar strip inverted arch; the plain concrete strip inverted arches (7) are plain concrete strip support inverted arches formed by concrete pouring.

2. The support structure for coal mine tunnel floor heave control according to claim 1, It is characterized in that The width of the steel bar strip inverted arch (2) is not less than the width of the plain concrete strip inverted arch (7).

3. The method for constructing a support structure for coal mine tunnel floor heave control according to claim 1 or 2, It is characterized in that Follow the steps below to implement it: Step 1, as the tunnel (1) is excavated or after the tunnel (1) is excavated once, the tunnel floor 3 is excavated as required; at the same time, the steel arch main reinforcement (5) and the steel arch stirrups (6) of the steel arch (4) are prepared on the ground and transported to the underground use site; Step 2, for the strip of the tunnel floor (3) where the steel arch (4) is to be arranged, the steel arch main reinforcement (5) and the steel arch stirrups (6) are arranged in sequence; the steel arch main reinforcement (5) is four and is distributed at the four corners of the steel arch (4); the steel arch stirrups (6) are evenly arranged around the steel arch main reinforcement (5) along the longitudinal direction of the steel arch (4) at a certain interval; the steel arch main reinforcement (5) and the steel arch stirrups (6) are connected to form an integral steel arch (4); Step 3, arranging a plurality of steel bar arches (4) in each of the steel bar strip inverted arches (2), and isolating the steel bar strip inverted arches (2) and the plain concrete strip inverted arches (7) with formwork on both sides of the steel bar strip inverted arches (2) to form a closed strip casting space; Step 4, pouring concrete on the steel bar strip inverted arch (2) and the plain concrete strip inverted arch (7) in sequence. After the concrete pouring of the steel bar strip inverted arch (2) and the plain concrete strip inverted arch (7) is completed, a support structure composed of the steel bar strip inverted arch (2) and the plain concrete strip inverted arch (7) is formed on the tunnel floor.

4. The method for constructing the support structure for coal mine tunnel floor heave control according to claim 3 It is characterized in that The concrete used for pouring is mixed according to the set mix ratio, poured on site and vibrated to make it dense.

5. The method for constructing a support structure for coal mine tunnel floor heave control according to claim 3, It is characterized in that The strength of the concrete used in the steel bar strip anti-arch (2) is not less than the strength of the concrete used in the plain concrete strip anti-arch (7).

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