Method for treating main roadway floor heave affected by repeated mining

Abstract

The invention relates to the technical field of roadway treatment, and particularly discloses a method for treating a main roadway floor heave affected by repeated mining, which specifically comprises the following steps of: detecting geological conditions, floor surrounding rock conditions and stress states of a roadway; the bottom of the roadway is lifted, and an arc-shaped inverted arch is formed through excavation; a plurality of steel bars are laid on the excavated inverted arch, and the steel bars are arranged in the width direction of the roadway; a plurality of inverted arched girders are arranged on the laid steel bars, the inverted arched girders are perpendicular to the steel bars, and the inverted arched girders and the steel bars are fixed in a welding mode; a supporting frame is installed on the inverted arched beam, so that the supporting frame and the inverted arched beam form an annular structure; and concrete is poured at the bottom of the roadway, the inverted arch beams and the steel bars are covered, and a pavement is formed. According to the method, top plate sinking and bottom plate bulging can be effectively controlled from a bottom heave forming mechanism, efficient treatment of roadway bottom heaves is achieved, follow-up maintenance of the bottom plate is not needed, normal production is guaranteed, and the method is suitable for large-scale application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of roadway treatment, and particularly relates to a method for treating the floor heave of main roadways affected by repeated mining disturbances. Background Art

[0002] During the tunneling or coal mining process of coal seams, as the working face continuously advances, the roadway deforms severely, usually manifested as roof subsidence, local roof rupture, failure of bolt support, and breakage of individual bolts, etc., and usually accompanied by phenomena such as water seepage, water dripping, severe inward extrusion of the roadway sidewalls, and strong floor heave of the roadway, which bring great potential safety hazards to the maintenance and use of the roadway. And the floor heave of the roadway is the most difficult link to control in the surrounding rock deformation. The deformation and failure of the roadway floor often lead to the reduction of the roadway section and even the failure of support, seriously affecting the safety of coal mine pedestrians and transportation.

[0003] Currently, most of the mining roadways adopt the method of allowing the floor to heave during mining and then passively scraping the floor later, which not only wastes working hours but also affects the normal use of the roadway and delays production. Although the existing floor heave treatment methods also use the method of direct grouting, this treatment method has poor actual treatment effects because it does not consider the specific stress conditions of the roadway floor. Subsequently, the roadway floor needs to be dug and repaired many times to meet the actual requirements of safe production and use, which is time-consuming, laborious and costly. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for treating the floor heave of main roadways affected by repeated mining disturbances to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above purpose, the present invention provides a method for treating the floor heave of main roadways affected by repeated mining disturbances, which specifically includes the following steps: Detect the geological conditions, floor surrounding rock conditions and stress states of the roadway; Scrape the floor of the roadway to excavate an arc-shaped inverted arch floor; Lay multiple steel bars on the excavated inverted arch floor, and the multiple steel bars are arranged along the width direction of the roadway; Set multiple inverted arch beams on the laid steel bars, the inverted arch beams are perpendicular to the steel bars, and the inverted arch beams are fixed to the steel bars by welding; Install a support frame on the inverted arch beam to form an annular structure between the support frame and the inverted arch beam; Pour concrete at the bottom of the roadway to cover the inverted arch beam and the steel bars and form a road surface.

[0006] Preferably, when scraping the floor of the roadway, the excavation depth is 0.5 m to 0.8 m.

[0007] Preferably, multiple layers of steel bars are laid on the excavated inverted arch bottom, and the distance between adjacent two layers of steel bars is not greater than 30 cm; when the length of the steel bar is insufficient, the steel bar is extended by means of welding lap joint, and the lap joint length of the steel bar is not less than 20 times the diameter of the steel bar.

[0008] Preferably, every 300 cm range along the length direction of the roadway is a treatment interval. At least one ring structure formed by a support frame and an inverted arch beam is provided within one treatment interval, and the number of ring structures within adjacent two treatment intervals is not less than three; When the length of the treatment interval is 100 cm to 400 cm, the number of ring structures is two, and the two ring structures are respectively arranged at both ends of the treatment interval.

[0009] Preferably, concrete is poured at the bottom of the roadway, and the concrete is poured in layers, and the concrete is C30 grade concrete.

[0010] Preferably, before laying multiple layers of steel bars on the excavated inverted arch bottom, the excavated inverted arch bottom is compacted.

[0011] Preferably, reaction seats are fixedly arranged at both ends of the inverted arch beam. One end of the top surface of the reaction seat is embedded at the bottom of the side wall of the roadway, and the other end of the top surface of the reaction seat is fixedly connected with the support frame.

[0012] Preferably, the support frame includes a top surface arch beam and support columns installed at both ends of the top surface arch beam, and the bottom ends of the support columns are installed at the top ends of the reaction seats.

[0013] Preferably, the support column includes a hydraulic cylinder. Column bodies are arranged at both ends of the hydraulic cylinder, and the two column bodies are respectively fixed to the reaction seat and the top surface arch beam by bolts; an installation groove is formed on one side of the column body close to the hydraulic cylinder, and both ends of the hydraulic cylinder are respectively arranged in the two installation grooves; a threaded telescopic rod is arranged between the two column bodies. The threaded telescopic rod includes a threaded sleeve and a threaded rod threadedly connected to one end of the threaded sleeve, and the threaded sleeve and the threaded rod respectively abut against the installation grooves of the two column bodies.

[0014] Preferably, the surface of the column body close to the side wall of the roadway is an arc surface.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects: The method for controlling the floor heave of the main roadway affected by repeated mining subsidence provided by the present invention can support both the roof and the floor of the roadway simultaneously by excavating the floor heave section of the roadway to form an arc-shaped inverted arch bottom, and by laying steel bars and arranging the inverted arch beam and the support frame, and can effectively control the roof subsidence and the floor heave.

[0016] Considering the formation mechanism of floor heave, the present invention realizes the efficient control of roadway floor heave, eliminating the need for subsequent floor maintenance, thus ensuring normal production and being suitable for large-scale popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a cross-sectional view during the treatment of roadway floor heave of the present invention; In the figure: 1, roadway; 2, steel bars; 3, inverted arch beam; 4, concrete; 5, reaction seat; 6, top arch beam; 7, column; 8, hydraulic cylinder; 9, threaded rod; 10, threaded sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The following will describe the present invention in detail with reference to the drawings and in combination with the embodiments.

[0020] As Figure 1 shown, the present invention provides a method for treating the floor heave of main roadways affected by repeated mining, which specifically includes the following steps: Detect the geological conditions, floor surrounding rock conditions and stress states of the roadway 1; Undercut the roadway 1 to excavate an arc-shaped inverted floor arch; Lay multiple steel bars 2 on the excavated inverted floor arch, and the multiple steel bars 2 are arranged along the width direction of the roadway 1; Set multiple inverted arch beams 3 on the laid steel bars 2, the inverted arch beams 3 are perpendicular to the steel bars 2, and the inverted arch beams 3 are fixed to the steel bars 2 by welding; Install a support frame on the inverted arch beam 3 to form an annular structure with the inverted arch beam 3; Pour concrete 4 at the bottom of the roadway 1 to cover the inverted arch beam 3 and the steel bars 2 and form a road surface.

[0021] As a further optimized solution, when undercutting the roadway 1, the excavation depth is 0.5 m to 0.8 m.

[0022] For a further optimized solution, multiple layers of steel bars 2 are laid on the excavated inverted arch bottom, and the distance between adjacent two layers of steel bars 2 is not greater than 30 cm; when the length of the steel bar 2 is insufficient, the steel bar 2 is extended by means of welded lap joint, and the lap joint length of the steel bar 2 is not less than 20 times the diameter of the steel bar 2.

[0023] For a further optimized solution, every 300 cm along the length direction of the roadway 1 is taken as a treatment interval. At least one support frame is arranged within a treatment interval to form an annular structure with the inverted arch beam 3, and the number of annular structures within adjacent two treatment intervals is not less than three; When the length of the treatment interval is 100 cm to 400 cm, the number of annular structures is two, and the two annular structures are respectively arranged at both ends of the treatment interval.

[0024] For a further optimized solution, concrete 4 is poured at the bottom of the roadway 1, and the concrete 4 is poured in a layered manner, and the concrete 4 is C30 grade concrete.

[0025] For a further optimized solution, the excavated inverted arch bottom is compacted before laying multiple layers of steel bars 2 on it.

[0026] For a further optimized solution, reaction seats 5 are fixedly arranged at both ends of the inverted arch beam 3. One end of the top surface of the reaction seat 5 is embedded at the bottom of the side wall of the roadway 1, and the other end of the top surface of the reaction seat 5 is fixedly connected to the support frame.

[0027] For a further optimized solution, the support frame includes a top surface arch beam 6 and support columns installed at both ends of the top surface arch beam 6, and the bottom ends of the support columns are installed at the top ends of the reaction seats 5.

[0028] For a further optimized solution, the support column includes a hydraulic cylinder 8. Column bodies 7 are arranged at both ends of the hydraulic cylinder 8, and the two column bodies 7 are respectively fixed to the reaction seat 5 and the top surface arch beam 6 by bolts; an installation groove is formed on one side of the column body 7 close to the hydraulic cylinder 8, and both ends of the hydraulic cylinder 8 are respectively arranged in the two installation grooves; a threaded telescopic rod is arranged between the two column bodies 7. The threaded telescopic rod includes a threaded sleeve 10 and a threaded rod 9 threadedly connected to one end of the threaded sleeve 10, and the threaded sleeve 10 and the threaded rod 9 respectively abut against the installation grooves of the two column bodies 7.

[0029] For a further optimized solution, the surface of the column body 7 close to the side wall of the roadway 1 is an arc surface.

[0030] The method for controlling the floor heave of main roadways affected by repeated mining disturbances provided by the present invention excavates the floor heave section of roadway 1 to form an arc-shaped inverted arch, and through the laying of steel bars 2 and the setting of inverted arch beams 3 and support frames, a support structure for restraining the deformation at the bottom of roadway 1 is formed by the inverted arch beams 3 and steel bars 2; at the same time, through the setting of the support frames, when the support frames are installed, the top arch beam 6 is abutted against the roof of roadway 1 by hydraulic cylinders 8 and threaded telescopic rods, so that the roof and floor of roadway 1 can be supported simultaneously, effectively controlling the roof subsidence and floor heave; at the same time, a part of the reaction seats 5 on the inverted arch beams 3 is embedded at the bottom of the side walls of roadway 1. Through the setting of the reaction seats 5, the inverted arch beams 3 are further prevented from protruding upward by the surrounding rock structure of roadway 1, thereby restraining the floor deformation of roadway 1. Through the setting of the reaction seats 5 and support frames, and through the re-pouring of concrete 4 to form a road surface, a relatively high support strength can be provided for the position where the floor heave of roadway 1 occurs, effectively controlling the deformation of roadway 1.

[0031] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for controlling the floor heave of main roadway affected by repeated mining, characterized in that Specifically, it includes the following steps: Detect the geological conditions, floor surrounding rock conditions and stress state of the roadway; Undercut the roadway to excavate an arc-shaped inverted arch at the bottom; Lay multiple steel bars on the excavated inverted arch, and the multiple steel bars are arranged along the width direction of the roadway; Set multiple inverted arch beams on the laid steel bars. The inverted arch beams are perpendicular to the steel bars, and the inverted arch beams are fixed to the steel bars by welding; Install a support frame on the inverted arch beam to form an annular structure with the inverted arch beam; Pour concrete at the bottom of the roadway to cover the inverted arch beam and the steel bars and form a road surface.

2. The method for controlling the floor heave of the main roadway affected by repeated mining as claimed in claim 1, wherein When undercutting the roadway, the excavation depth is 0.5m to 0.8m.

3. The method for controlling the floor heave of the main roadway affected by repeated mining as claimed in claim 1, wherein When laying multiple steel bars on the excavated inverted arch, the distance between adjacent two steel bars is not greater than 30cm; when the length of the steel bar is insufficient, the steel bar is extended by means of welded lap joint, and the lap joint length of the steel bar is not less than 20 times the diameter of the steel bar.

4. The method for controlling the floor heave of the main roadway affected by repeated mining according to claim 3, wherein Every 300cm range along the length direction of the roadway is a treatment section. At least one annular structure formed by a support frame and an inverted arch beam is set in a treatment section, and the number of annular structures in adjacent two treatment sections is not less than three; When the length of the treatment section is 100cm to 400cm, the number of annular structures is two, and the two annular structures are respectively arranged at both ends of the treatment section.

5. The method for controlling the floor heave of the main roadway affected by repeated mining as claimed in claim 1, wherein When pouring concrete at the bottom of the roadway, the concrete is poured in layers, and the concrete is C30 grade concrete.

6. The method for controlling the floor heave of the main roadway affected by repeated mining according to claim 1, wherein Before laying multiple steel bars on the excavated inverted arch, compact the excavated inverted arch.

7. The method for controlling the floor heave of the main roadway affected by repeated mining according to claim 1, characterized in that, Both ends of the inverted arch beam are fixedly provided with reaction seats. One end of the top surface of the reaction seat is embedded at the bottom of the side wall of the roadway, and the other end of the top surface of the reaction seat is fixedly connected to the support frame.

8. The method for controlling the floor heave of the main roadway affected by repeated mining according to claim 7, characterized in that, The support frame includes a top surface arch beam and support columns installed at both ends of the top surface arch beam. The bottom ends of the support columns are installed at the top ends of the reaction seats.

9. The method for controlling the floor heave of the main roadway affected by repeated mining according to claim 8, characterized in that, The support column includes a hydraulic cylinder. Both ends of the hydraulic cylinder are provided with column bodies. The two column bodies are respectively fixed to the reaction seat and the top surface arch beam by bolts; an installation groove is opened on one side of the column body close to the hydraulic cylinder, and both ends of the hydraulic cylinder are respectively arranged in the two installation grooves; a threaded telescopic rod is arranged between the two column bodies. The threaded telescopic rod includes a threaded sleeve and a threaded rod threadedly connected to one end of the threaded sleeve. The threaded sleeve and the threaded rod respectively abut against the installation grooves of the two column bodies.

10. The method for controlling the floor heave of the main roadway affected by repeated mining as claimed in claim 9, characterized in that, The surface of the column body close to the side wall of the roadway is an arc surface.

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