A movable floor steel-concrete support for a floor roadway and a construction method thereof

Abstract

The present invention discloses a movable steel-concrete support for the floor roadway and a construction method thereof, which includes a hollow steel body, a hydraulic support, a concrete slurry, a fixed slider and a sliding rail. The hollow steel body is arranged at the bottom of the roadway, and a number of hydraulic supports are arranged between the hollow steel body and the top of the roadway; the bottoms of the number of hydraulic supports are fixedly installed on the hollow steel body, and the tops are provided with fixed sliders; a support plate is arranged at the top end of the roadway, and a sliding rail matching with the fixed slider is arranged at the lower end of the support plate; a grouting port and an exhaust port are respectively arranged at the front end and the tail end of the upper end surface of the hollow steel body, and the inside of the hollow steel body is filled with the concrete slurry entering from the grouting port. By combining the bottom steel-concrete structure with the middle hydraulic support and the upper sliding rail, the present invention not only strengthens the integrity of the floor support and improves the floor support strength, but also is convenient for movement and assembly and can be reused, thereby solving the problem of floor heave control in mine roadways.

Description

Technical Field

[0001] The present invention relates to the technical field of mine support engineering, and particularly to a movable floor steel-concrete support structure and construction method for a roadway with severe floor heave. Background Art

[0002] Coal is the basic energy source and important raw material in China, accounting for more than 90% of China's fossil energy resources. Its status as the main energy source will not change in a quite long period. Therefore, the coal industry is an important basic industry related to the national economic lifeline and energy security. Thus, the safe and efficient exploitation of coal resources is particularly important. At present, many coal mines in the central and eastern regions of China have entered the deep mining stage, and the mining depth of coal mines in the western region is also increasing. Under the complex mining conditions such as high in-situ stress, soft surrounding rock, and strong mining influence in deep mines, the problem of roadway surrounding rock control is becoming increasingly prominent, among which the problem of roadway floor heave is particularly prominent. The floor of the coal mine roadway becomes a weak link in roadway support due to no support or weak support, resulting in the release of surrounding rock stress and roadway deformation first appearing in the floor, forming a serious floor heave phenomenon. The floor heave further leads to the overall deformation and failure of the roadway and even roof caving and instability, bringing great hidden dangers to the safe production of coal mines.

[0003] In response to this, the current main treatment measures for roadway floor heave include: floor ripping, bolt and cable support, grouting reinforcement, and inverted arch support. However, there are still the following problems for severely floor-heaved roadways under complex conditions: cleaning the crushed gangue on the floor by floor ripping only treats the symptoms but not the root cause, and multiple floor rippings will even exacerbate the deformation of the two sides and the roof of the roadway; bolt and cable support has problems such as difficult construction of floor drilling, poor anchoring effect, the floor between bolts and cables cannot be covered, and the overall control effect is poor; although grouting reinforcement can improve the strength of the floor surrounding rock, the improvement degree is limited, and it is difficult to inhibit floor heave; inverted arch support has problems such as large rigidity and easy breakage, and the later repair is extremely difficult. Therefore, how to innovate the floor support structure, simplify the support process, improve the integrity of the floor support, and realize the reuse of the floor support structure has become the key to solving the floor control of severely floor-heaved roadways. Summary of the Invention

[0004] The purpose of the present invention is to provide a movable floor steel-concrete support for a severely floor-heaved roadway and a construction method to solve the above-mentioned problems.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A movable floor steel-concrete support for a roadway with severe floor heave, comprising a hollow steel body, hydraulic supports, concrete slurry, fixed sliders and sliding rails. The hollow steel body is arranged at the bottom of the roadway, and a number of hydraulic supports are arranged between the hollow steel body and the top of the roadway; the bottoms of the number of hydraulic supports are fixedly installed on the hollow steel body, and the fixed sliders are arranged at the tops; the support plate is arranged at the top end of the roadway, and the sliding rails matching the fixed sliders are arranged at the lower end of the support plate; a grouting port and an exhaust port are respectively arranged at the front end and the tail end of the upper end face of the hollow steel body, and the concrete slurry coming in from the grouting port is poured into the hollow steel body.

[0007] The sliding rails are fixedly installed at the top end of the roadway through bolts passing through the support plate, and the support plate is in surface contact with the surrounding rock of the roof of the roadway.

[0008] The bottoms of the number of hydraulic supports are arranged on the upper end face of the hollow steel body through support bases.

[0009] A number of support feet are symmetrically arranged at the center of the support base; the cross sections of the number of support feet are triangular structures, one end of which is arranged on the upper end face of the hollow steel body, and the other end is arranged on the outer side wall of the hydraulic support.

[0010] A grout plug for preventing the concrete slurry from overflowing is configured on the exhaust port.

[0011] The hydraulic supports and the sliding rails are respectively distributed on both sides close to the roadway sidewalls in the roadway.

[0012] The bottom of the hollow steel body is provided with a roadway floor, and a pressure relief groove for preventing its deformation is arranged on the roadway floor.

[0013] A construction method for a movable floor steel-concrete support for a floor heave roadway, characterized by comprising the following construction steps:

[0014] Step 1, material preparation and processing; according to the mechanical properties of the rock stratum of the roadway floor, the magnitude of the floor mine pressure, the shape and size of the roadway cross-section, determine the material, thickness and size of the hollow steel body, the model and size of the hydraulic support, as well as the materials and mix ratios of the poured concrete, the model and size of the sliding rails, and prepare the materials of all the component members and carry out processing;

[0015] Step 2, transportation and laying of the component members of the floor steel-concrete support; clean and level the roadway floor so that its height reaches the sum of the designed height of the roadway and the thickness of the hollow steel body; install the sliding rails on the roof through bolts, and use a single-track crane to transport the hollow steel body, hydraulic supports, concrete materials, fixed sliders, etc. to the construction site for floor treatment;

[0016] Step 3: Continuously place the floor steel-concrete support on the surface of the roadway floor in sequence, arrange it in 2 to 3 rows along the roadway trend, and pour concrete slurry into the hollow steel body; determine the mass of the poured concrete slurry according to the internal space size of the hollow steel body, and then use a grouting pump to pour the concrete slurry into the hollow steel body of each support through the grouting port in sequence; after grouting, use a grout plug to seal the exhaust port to prevent the slurry from overflowing; after the concrete slurry solidifies and hardens, it forms the bottom support structure of the floor steel-concrete support together with the hollow steel body.

[0017] Step 4: Install the hydraulic props; after the pouring of the hollow steel body is completed and the concrete has hardened, install the hydraulic props, and use a support base to fix the hydraulic props on the hollow steel body; connect the top of the hydraulic prop to the sliding rail with a fixed slider.

[0018] Step 5: Raise the hydraulic props, apply pressure to several hydraulic props to support the hollow steel body and the sliding rail, and then act on the roadway floor and roof to achieve the initial support of the floor; supply liquid to the hydraulic props through a hydraulic pump station, pipelines and injection guns, stop supplying liquid after raising the props and reaching the designed initial support force, so as to achieve the initial support of the floor and play a role in applying active prestress to the floor.

[0019] Step 6: According to the requirements of the floor steel-concrete support layout, complete the layout and installation of the floor supports of the whole roadway in sequence, and finally form a high-strength, movable integral floor support structure.

[0020] Step 7: When the floor steel-concrete support is damaged, the floor steel-concrete support structure can be lifted by a single-track crane and dragged integrally through the sliding rail to realize the transportation or replacement and repair of the support.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0022] First, the movable floor steel-concrete support structure provided by the present invention adopts an integral steel-concrete structure combined with a hollow steel body and concrete, enabling the strong compressive characteristics of concrete to be organically complemented with the strong tensile characteristics and toughness of the large-thickness steel structure. Therefore, both the compressive strength and the tensile strength of the floor support structure of the present invention are effectively improved, greatly enhancing the integrity and bearing capacity of the floor support structure, avoiding the brittle failure of the traditional pure concrete structure, and being able to effectively control the floor heave of the roadway floor.

[0023] Second, the movable floor steel-concrete support structure provided by the present invention is connected by hydraulic props, the bottom steel-concrete structure, and the top sliding steel rails. By supplying liquid to the hydraulic props and raising the props, the initial support for the floor is realized, which plays a role in applying active prestress to the floor, effectively improving the stress conditions of the surrounding rock of the floor and enhancing the self-bearing capacity of the surrounding rock of the floor. During the operation of the floor steel-concrete support, a greater supporting force can also be applied, providing a higher support resistance to the floor deformation. The hydraulic props can also set the maximum working resistance. When the pressure of the roadway floor exceeds the maximum working resistance of the support, the floor steel-concrete support can have a certain shrinkability, playing a role of high-resistance yielding.

[0024] Third, for the movable floor steel-concrete support structure provided by the present invention, the upper part of the hydraulic prop is connected to the sliding steel rail by a fixed slider, and the fixed slider is slidably connected to the sliding steel rail. The floor steel-concrete support structure can be lifted by a single-track crane and dragged integrally through the sliding steel rail. Therefore, the floor steel-concrete support provided by the present invention has mobility, which is convenient for transportation, replacement, and maintenance, simplifies the floor support process, improves the floor operation efficiency, and the floor steel-concrete support can also be reused, effectively reducing the floor support cost.

[0025] In summary, the present invention adopts a floor combining a steel-concrete structure, hydraulic props, and sliding steel rails. The structural design is reasonable, which not only strengthens the integrity of the floor support and improves the floor support strength, but also has a certain shrinkability, is convenient for movement and assembly, can be reused, is simple to implement on-site, has high efficiency, and low support cost, and can effectively solve the problem of roadway floor heave. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the drawings.

[0027] Figure 1 It is a schematic diagram of the roadway section layout of the movable floor steel-concrete support of the present invention;

[0028] Figure 2 It is a schematic three-dimensional structure diagram of the movable floor steel-concrete support of the present invention;

[0029] Figure 3 It is a top view of the bottom bearing structure of the floor steel-concrete support of the present invention;

[0030] Figure 4 It is a schematic sectional view of the sliding structure of the floor steel-concrete support of the present invention;

[0031] Figure 5 It is a schematic side view of the sliding structure of the floor steel-concrete support of the present invention;

[0032] Description of reference numerals: 1. Hollow steel body; 2. Hydraulic support; 3. Concrete slurry; 4. Fixed slider; 5. Sliding rail; 6. Grouting port; 7. Exhaust port; 8. Support base; 9. Support footrest; 10. Support plate; 11. Roadway; 12. Anchor bolt; 13. Pressure relief groove. Detailed implementation manners

[0033] As Figures 1-5 shown, a movable floor steel-concrete support for a severely floor-heaving roadway, including a hollow steel body 1, a hydraulic support 2, a concrete slurry 3, a fixed slider 4 and a sliding rail 5. The hollow steel body (1) is arranged at the bottom of the roadway 11, and a plurality of hydraulic supports 2 are arranged between the hollow steel body 1 and the top of the roadway 11. The hollow steel body 1 is a hollow cuboid integrally cast from high-strength and good-toughness steel, and the edges and corners are chamfered. In this embodiment, the hollow steel body 1 is integrally cast from high-strength and good-toughness steel above Q460, the steel thickness is 15 - 30 mm, the length of the hollow steel body 1 is 1 - 3 m, the width is 0.5 - 1.5 m, and the thickness is 0.3 - 1 m. The length, width and thickness of the hollow steel body 1 can be determined according to factors such as the magnitude of mine pressure and the cross-sectional size of the roadway.

[0034] A grouting port 6 and an exhaust port 7 are respectively arranged at the front end and the tail end of the upper end surface of the hollow steel body 1, and the interior of the hollow steel body 1 is filled with the concrete slurry 3 that enters from the grouting port 6. The exhaust port 7 is used to exhaust air when pouring the concrete slurry 3, and the exhaust port 7 is configured with a grout plug. After the hollow steel body is completed with concrete pouring, the grout plug is used to prevent the concrete slurry 3 from overflowing. During construction, the concrete slurry 3 is poured through the grouting port 6. After the concrete slurry 3 solidifies and hardens, a bottom support structure of the floor steel-concrete support is formed.

[0035] The concrete slurry 3 poured into the hollow steel body 1 is concrete with good fluidity, low bleeding rate and fast hardening, and the concrete strength grade is above C30. The materials poured into the hollow steel body 1 can adopt hardening materials such as cement-based grouting material, chemical-based grouting material or composite grouting material.

[0036] The bottoms of a plurality of the hydraulic supports 2 are fixedly installed on the hollow steel body 1, and fixed sliders 4 are arranged at the tops. The bottoms of a plurality of the hydraulic supports 2 are installed on the upper end surface of the hollow steel body 1 through a support base 8 and bolts. A plurality of support footrests 9 are symmetrically arranged at the center of the support base 8. The cross-sections of the plurality of support footrests 9 are triangular structures, one end of which is arranged on the upper end surface of the hollow steel body 1, and the other end is arranged on the outer side wall of the hydraulic support 2. The support base 8, the support footrest 9 and the bottom of the hydraulic support 2 are of an integral structure. In this embodiment, the thickness of the support base 8 connecting the hydraulic support 2 is 10 - 20 mm.

[0037] In this embodiment, the hydraulic support 2 is an externally pressurized hydraulic support. Liquid is supplied to the hydraulic support 2 through a hydraulic pump station, pipelines, and a liquid injection gun. After the support is lifted and the designed initial support force is reached, the liquid supply stops. The initial support force of the hydraulic support 2 should reach more than 100 kN, and the working resistance should reach more than 300 kN. The liquid supply and lifting of the hydraulic support 2 should be carried out after the concrete slurry 3 poured into the hollow steel body 1 has hardened.

[0038] At the top of the roadway 11, there is a support plate 10 that is in "surface contact" with its surrounding rock, to prevent the pressure generated by floor heave from pressing the rail into the roof or damaging the roof through the hydraulic support 2. At the lower end of the support plate 10, there is a sliding rail 5 that matches the fixed slider 4. The sliding rail 5 is fixedly installed at the top of the roadway 11 after the anchor bolt 12 passes through the support plate 10. The floor steel-concrete support can be lifted by a single-track crane and dragged integrally through the sliding rail 5 to achieve the transportation, replacement, or repair of the support. The floor steel-concrete support is towed to the floor heave treatment area by a single-track crane and the sliding rail, placed in rows and continuously on the surface of the roadway floor, arranged in 2 - 3 rows along the roadway direction. By applying pressure to the support base 8 of the steel-concrete support and the top sliding rail 5 through the hydraulic support 2, the support resistance for the floor deformation is provided.

[0039] When supporting the floor of the roadway 11, first, clean and level the roadway floor so that its height reaches the sum of the designed height of the roadway and the thickness of the hollow steel body 1. Then, continuously place the floor steel-concrete support on the surface of the roadway floor. Next, lift the hydraulic support 2 through a hydraulic pump and support it on the sliding rail 5. Furthermore, the support pressure of the hydraulic support 2 can act on the floor, playing a role in improving the stress state of the floor surrounding rock and providing support resistance for the floor deformation. The hydraulic support 2 and the sliding rail 5 are respectively distributed on both sides of the roadway 11 close to the roadway sidewalls, to avoid affecting normal transportation and pedestrian traffic.

[0040] When supporting the floor of the roadway 11, first, clean and level the roadway floor so that its height reaches the sum of the designed height of the roadway and the thickness of the hollow steel body 1. Then, continuously place the floor steel-concrete support on the surface of the roadway floor. Next, lift the hydraulic support 2 through a hydraulic pump and support it on the sliding rail 5. Furthermore, the support pressure of the hydraulic support 2 can act on the floor, playing a role in improving the stress state of the floor surrounding rock and providing support resistance for the floor deformation.

[0041] At the bottom of the hollow steel body 1, there is a roadway floor. On the roadway floor, there is a pressure relief groove 13 to prevent its deformation. The pressure relief groove can be arranged on both sides of the roadway floor or in the middle of the roadway floor. When the mine pressure of the roadway is relatively large, the pressure relief groove can release part of the floor deformation pressure.

[0042] The construction process of the movable floor steel-concrete support for roadway floor heave is as follows:

[0043] Step 1: Material preparation and processing; Determine the material, thickness, and size of the hollow steel body, the model and size of the hydraulic support, the materials and mix ratio of the poured concrete, the model and size of the sliding rail, and prepare the materials for all component parts and carry out processing according to the mechanical properties of the rock strata on the roadway floor, the magnitude of the floor abutment pressure, the shape and size of the roadway cross-section.

[0044] Step 2: Transportation and laying of the component parts of the floor steel-concrete support; Clean and level the roadway floor to make its height reach the sum of the designed height of the roadway and the thickness of the hollow steel body; Install the sliding rail on the roof through bolts, and use a single-track crane to transport the hollow steel body, hydraulic support, concrete materials, fixed sliders, etc. to the construction site for floor treatment.

[0045] Step 3: Place the floor steel-concrete supports continuously on the surface of the roadway floor in sequence, arrange 2 - 3 rows along the roadway direction, and pour concrete slurry into the hollow steel body; Determine the mass of the poured concrete slurry according to the internal space size of the hollow steel body, and then use a grouting pump to pour concrete slurry into the hollow steel body of each support through the grouting port in sequence; After grouting, use a grout plug to seal the exhaust port to prevent the slurry from overflowing; After the concrete slurry solidifies and hardens, it forms the bottom support structure of the floor steel-concrete support together with the hollow steel body.

[0046] Step 4: Install the hydraulic support; After the hollow steel body is filled and the concrete hardens, install the hydraulic support, and fix the hydraulic support on the hollow steel body using a support base; Connect the top of the hydraulic support to the sliding rail with a fixed slider.

[0047] Step 5: Raise the hydraulic support, apply pressure to several hydraulic supports to support on the hollow steel body and the sliding rail, and then act on the roadway floor and roof to realize the initial support of the floor; Supply liquid to the hydraulic support through a hydraulic pump station, pipeline, and injection gun, raise the support and reach the designed initial support force, then stop supplying liquid, thereby realizing the initial support of the floor and playing a role in applying active prestress to the floor.

[0048] Step 6: Complete the layout and installation of the floor supports for the entire roadway in sequence according to the layout requirements of the floor steel-concrete support, and finally form a high-strength, movable floor integral support structure.

[0049] Step 7: When the floor steel-concrete support is damaged, the floor steel-concrete support structure can be lifted by a single-track crane and dragged integrally through the sliding rail to realize the transportation or replacement and repair of the support.

[0050] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A construction method for a movable floor steel-concrete support in a floor roadway, characterized in that: It includes a hollow steel body (1), a hydraulic support (2), a concrete slurry (3), a fixed slider (4) and a sliding rail (5). The hollow steel body (1) is arranged at the bottom of the roadway (11), and a number of hydraulic supports (2) are arranged between the hollow steel body (1) and the top of the roadway (11); the bottoms of the number of hydraulic supports (2) are fixedly installed on the hollow steel body (1), and the fixed slider (4) is arranged at the top; a support plate (10) is arranged at the top end of the roadway (11), and the sliding rail (5) matching the fixed slider (4) is arranged at the lower end of the support plate (10); a grouting port (6) and an exhaust port (7) are respectively arranged at the front end and the tail end of the upper end surface of the hollow steel body (1), and the concrete slurry (3) coming in from the grouting port (6) is poured into the hollow steel body (1). It includes the following construction steps: Step 1, material preparation and processing: According to the mechanical properties of the rock stratum at the bottom of the roadway, the magnitude of the floor mine pressure, the shape and size of the roadway section, determine the material, thickness and size of the hollow steel body, the model and size of the hydraulic support, as well as the materials and proportions of the poured concrete, the model and size of the sliding rail, and prepare the materials of all component parts and carry out processing. Step 2, transportation and laying of the component parts of the floor steel-concrete support Clean and level the roadway floor to make its height reach the sum of the designed height of the roadway and the thickness of the hollow steel body; install the sliding rail on the roof through bolts, and use a single-track crane to transport the hollow steel body, hydraulic support, concrete materials, fixed slider, etc. to the construction site for floor treatment. Step 3, successively and continuously place the hollow steel bodies of the floor steel-concrete support on the surface of the roadway floor, arrange them in 2-3 rows along the roadway trend, and pour the concrete slurry into the hollow steel body; according to the size of the internal space of the hollow steel body, determine the mass of the poured concrete slurry, and then use a grouting pump to pour the concrete slurry into the hollow steel body of each support through the grouting port in turn; after grouting, use a grout plug to seal the exhaust port to prevent the slurry from overflowing; after the concrete slurry solidifies and hardens, it forms the bottom support structure of the floor steel-concrete support together with the hollow steel body. Step 4, install the hydraulic support: After the hollow steel body is poured and the concrete hardens, install the hydraulic support. Fix the hydraulic support on the hollow steel body with a support base; connect the top end of the hydraulic support to the sliding rail with a fixed slider. Step 5, raise the hydraulic support, pressurize a number of hydraulic supports to support on the hollow steel body and the sliding rail, and then act on the roadway floor and roof to realize the initial support of the floor; realize the liquid supply to the hydraulic support through a hydraulic pump station, pipeline and injection gun, raise the support and stop the liquid supply after reaching the designed initial support force, so as to realize the initial support of the floor and play the role of applying active prestress to the floor. Step 6, according to the requirements of the floor steel-concrete support layout, successively complete the layout and installation of the floor supports of the whole roadway, and finally form a high-strength, movable floor integral support structure. Step 7: When the floor steel-concrete support is damaged, the support structure of the floor steel-concrete support can be lifted by a single-track crane and integrally dragged through the sliding rail to achieve the transportation or replacement and repair of the support.

2. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 1, characterized in that: The sliding rail (5) is fixedly installed at the top of the roadway (11) by passing the anchor bolt (12) through the support plate (10), and the support plate (10) is in surface contact with the roof surrounding rock of the roadway (11).

3. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 1, characterized in that: The bottoms of several hydraulic supports (2) are arranged on the upper end surface of the hollow steel body (1) through the support base (8).

4. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 3, characterized in that: Several support feet (9) are symmetrically arranged at the center of the support base (8); the cross-sections of several support feet (9) are triangular structures, one end of which is arranged on the upper end surface of the hollow steel body (1), and the other end is arranged on the outer side wall of the hydraulic support (2).

5. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 1, characterized in that: A grout stopper for preventing the concrete slurry (3) from overflowing is configured on the exhaust port (7).

6. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 1, characterized in that: The hydraulic supports (2) and the sliding rails (5) are respectively distributed on both sides close to the roadway sidewalls in the roadway (11).

7. The construction method of the movable floor steel-concrete support for the bottom drum roadway according to claim 1, characterized in that: The bottom of the hollow steel body (1) is provided with a roadway floor, and a pressure relief groove (13) for preventing its deformation is opened on the roadway floor.

Images