阅读说明：本技术 一种立交式密集巷道群下位巷道再生顶板再造方法 (Regeneration top plate reconstruction method for interchange type dense roadway group lower roadway ) 是由 罗明坤 梁顺 郝一松 李峰 黄炜伟 赵东升 何良 南戟文 孔鹏 于 2021-08-30 设计创作，主要内容包括：本发明公开一种立交式密集巷道群下位巷道再生顶板再造方法,在井下立交式密集巷道群的顶板利用合理的方式进行破碎；对顶板构建过程中巷道围岩破坏情况进行数值模拟分析；根据模拟结果选择合适的钢筋进行构建；在巷道顶板位置设计钢架结构构造初步建模；确定结构混凝土强度等级；在顶板构建的钢筋模板中浇灌混凝土进行准备工作；在构建完成的钢筋模板中浇灌混凝土并振捣；对混凝土再生顶板进行合理的支护；本发明油气井平台移至井下,空间上避开采掘影响,避免油气井失稳、破断引起的油气泄露、爆炸以及地下含水层污染等事故；缩短油气开采过程中的钻井时间、工程量和材料消耗,节省地面建设投资,减少开发成本。(The invention discloses a regeneration top plate reconstruction method for a lower roadway of an overpass type dense roadway group, which is characterized in that a top plate of an underground overpass type dense roadway group is crushed in a reasonable mode; carrying out numerical simulation analysis on the damage condition of the surrounding rock of the roadway in the roof construction process; selecting a proper steel bar for construction according to the simulation result; designing a steel frame structure at the position of a roadway top plate to construct a preliminary modeling; determining the strength grade of the structural concrete; pouring concrete into a steel bar formwork constructed on the top plate to prepare; pouring concrete in the constructed steel bar formwork and vibrating; reasonably supporting the concrete regenerated roof; the oil-gas well platform is moved underground, mining influence is avoided spatially, and accidents such as oil-gas leakage, explosion, underground aquifer pollution and the like caused by instability and breakage of the oil-gas well are avoided; the drilling time, the engineering quantity and the material consumption in the oil and gas exploitation process are shortened, the ground construction investment is saved, and the development cost is reduced.)

1. A method for reconstructing a regenerated roof of a lower roadway of an interchange type dense roadway group is characterized by comprising the following steps:

the method comprises the following steps: crushing the top plate of the underground interchange type dense roadway group in a reasonable mode;

step two: carrying out numerical simulation analysis on the damage condition of the surrounding rock of the roadway in the roof construction process; investigating and analyzing regional geology and surrounding rock stability of a constructed roof, and performing numerical simulation calculation on the damage condition of the surrounding rock of a roadway in the roof construction process by using software such as FLAC3D and the like to obtain a numerical simulation result of the deformation damage condition of the surrounding rock when the roof is not supported during the roof construction;

step three: selecting a proper steel bar for construction according to the simulation result of the second step;

step four: designing a steel frame structure at the position of a roadway top plate to construct a preliminary modeling;

step five: determining the strength grade of the structural concrete;

step six: pouring concrete into a steel bar formwork constructed on the top plate to prepare; preparing pouring materials and using machines and tools required by construction, checking and commissioning all the machines and tools, preparing an emergency scheme to ensure that people, materials and objects can meet the requirement of pouring speed, ensuring the supply of water and electricity and preventing quality accidents caused by accidents; the folded galvanized tile template and the bracket thereof are checked to ensure that the size is correct, and the strength, the rigidity, the stability and the tightness meet the requirements;

step seven: pouring concrete in the constructed steel bar formwork and vibrating; before concrete pouring, checking the vibrating machine and the electric box to ensure that personnel and equipment are sufficient; determining the pouring sequence of concrete, starting from the farthest position and the periphery of each monomer, and pouring the concrete from the farthest position to the nearest position at one time; the slab vibrator is adopted, a specially-assigned person is responsible for guarding and preventing leakage vibration, and meanwhile, when the slab is poured, the concrete stacking is not concentrated too much, so that quality accidents and dangers caused by excessive stacking and template load are prevented;

step eight: and reasonably supporting the concrete regenerated roof.

2. The method for reconstructing the regenerated roof of the underpass of the overpass type dense roadway group as claimed in claim 1, wherein in order to realize the service life of the roadway, not affect the safety of the roadway, ensure sufficient stability, satisfy the security and transportation of the equipment, and ensure sufficient fresh air in the underwell roadway, the following principles should be paid attention to when constructing the roof:

the roadway position should avoid the underground operation of the coal mine and the range of the movement of coal mine workers as much as possible;

the position of the roadway should be selected in two hard and stable rock stratums, and a larger geological structure and a larger aquifer should be avoided; meanwhile, the influence of normal exploitation rock stratum movement is not considered; arranging the thickness of the roadway top plate to be not less than 20 m;

the roadway must be ventilated normally, and as the underground ventilation system cannot be damaged, the gap is noticed when the roof is built, and the condition of air leakage cannot be caused.

Technical Field

The invention relates to a regeneration top plate reconstruction method for a lower roadway of an overpass type dense roadway group, and belongs to the technical field of roadway construction.

Background

In coal mine underground mining, the stability of a roadway is always an important research object; the coal mine production system is large and complex, underground roadways are complicated, and the situation of roadway crossing inevitably occurs.

The tunnel is excavated for the first time and can lead to destroying original surrounding rock stress balance, causes the stress redistribution, and the intercrossing in tunnel can cause the disturbance again to the surrounding rock that originally has the tunnel promptly for originally balanced promptly have tunnel surrounding rock stress to carry out the stress distribution once more, thereby lead to near the tunnel cross section surrounding rock stress to become more complicated, surrounding rock deformation aggravation.

The top plate of the roadway cross section is often damaged, and the control of the stability of surrounding rocks of the roadway cross section is difficult, which is always the key and difficult point of the stability analysis and support of the roadway.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for reconstructing a regenerated roof of a lower roadway of an overpass type dense roadway group, wherein an oil-gas well platform is moved underground, the mining influence is avoided spatially, and accidents such as oil-gas leakage, explosion, underground aquifer pollution and the like caused by instability and breakage of an oil-gas well are avoided; the drilling time, the engineering quantity and the material consumption in the oil and gas exploitation process are shortened, the ground construction investment is saved, and the development cost is reduced.

In order to achieve the purpose, the invention adopts the technical scheme that: a regeneration top plate reconstruction method for a interchange type dense roadway group lower roadway comprises the following steps:

the method comprises the following steps: crushing the top plate of the underground interchange type dense roadway group in a reasonable mode;

step two: carrying out numerical simulation analysis on the damage condition of the surrounding rock of the roadway in the roof construction process; and investigating and analyzing the regional geology and the surrounding rock stability of the constructed roof, and performing numerical simulation calculation on the damage condition of the surrounding rock of the roadway in the roof construction process by using software such as FLAC3D and the like to obtain a numerical simulation result of the deformation damage condition of the surrounding rock when the roof is not supported during the roof construction.

Step three: selecting a proper steel bar for construction according to the simulation result of the second step;

step four: designing a steel frame structure at the position of a roadway top plate to construct a preliminary modeling;

step five: determining the strength grade of the structural concrete;

step six: pouring concrete into a steel bar formwork constructed on the top plate to prepare; preparing pouring materials and using machines and tools required by construction, checking and commissioning all the machines and tools, preparing an emergency scheme to ensure that people, materials and objects can meet the requirement of pouring speed, ensuring the supply of water and electricity and preventing quality accidents caused by accidents; the folded galvanized tile template and the bracket thereof are checked to ensure that the size is correct and the strength, the rigidity, the stability and the tightness meet the requirements.

Step seven: pouring concrete in the constructed steel bar formwork and vibrating; before concrete pouring, checking the vibrating machine and the electric box to ensure that personnel and equipment are sufficient; determining the pouring sequence of concrete, starting from the farthest position and the periphery of each monomer, and pouring the concrete from the farthest position to the nearest position at one time; adopt the flat vibrator, there is the special messenger to be responsible for guarding and prevents leaking the vibration, and the windrow of paying attention to the concrete should not concentrate too much when pouring the flat board simultaneously, prevents that the windrow from concentrating too much, and the overweight emergence quality accident of template load is dangerous.

Step eight: and reasonably supporting the concrete regenerated roof.

Preferably, in order to realize the service life of the roadway, not influence the safety of the roadway, ensure enough stability, meet the security protection and the transportation of equipment, and ensure that the underground roadway has enough fresh air, the following principles should be noted when constructing the roof:

the roadway position should avoid the underground operation of the coal mine and the range of the movement of coal mine workers as much as possible;

the position of the roadway should be selected in two hard and stable rock stratums, and a larger geological structure and a larger aquifer should be avoided; meanwhile, the influence of normal mining rock stratum movement is not considered, and the thickness of the top plate of the roadway is not less than 20 m;

the roadway must be ventilated normally, and as the underground ventilation system cannot be damaged, the gap is noticed when the roof is built, and the condition of air leakage cannot be caused.

The invention has the beneficial effects that:

the platform of the oil-gas well is moved to the underground, the mining influence is avoided spatially, and accidents such as oil-gas leakage, explosion, underground aquifer pollution and the like caused by instability and breakage of the oil-gas well are avoided; the drilling time, the engineering quantity and the material consumption in the oil and gas exploitation process are shortened, the ground construction investment is saved, and the development cost is reduced.

Drawings

FIG. 1 is a schematic view of the present invention.

In the figure, 1 vertical bar, 2 stirrup and 3 stress bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments; it should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.

As shown in fig. 1, a method for reconstructing a regenerated roof of a lower roadway of an overpass dense roadway group comprises the following steps:

the method comprises the following steps: crushing the top plate of the underground interchange type dense roadway group in a reasonable mode;

step two: carrying out numerical simulation analysis on the damage condition of the surrounding rock of the roadway in the roof construction process;

the section and the length of the roadway are large, so that the supporting requirement on the section roadway is high. Therefore, investigation and analysis are carried out on regional geology and surrounding rock stability of the constructed roof, and numerical simulation calculation is carried out on the damage condition of the surrounding rock of the roadway in the roof construction process by using software such as FLAC3D and the like, so that the numerical simulation result of the deformation damage condition of the surrounding rock when the roof is not supported in the roof construction period is obtained; and (5) supporting the surrounding rock in time according to the simulation result, and keeping enough supporting strength.

Step three: selecting a proper steel bar for construction according to the simulation result of the second step;

selecting a reasonable reinforcing steel bar material according to a simulation result and combining with the actual situation of the site; the roadway roof adopts 25MnSi steel 3-grade steel bars with 380MPa of tensile strength as main materials, and adopts incombustible materials such as concrete and the like to pave the bottom, the thickness is 20-25m, and the requirement of the upper floor is met.

Step four: designing a steel frame structure at the position of a roadway top plate to construct a preliminary modeling; firstly, measuring and paying off at the position of a roadway top plate to form a peripheral steel plate template, and binding short-rib link reinforcing steel bars on mounting steel beams; the material is a 3-grade steel bar, the distance from the tail end of the lap joint length of the steel bar to the bending part of the steel bar is not less than 10 times of the diameter of the steel bar, and a joint is not positioned at the maximum bending moment of a component; in the tension area, the tail end of the I-grade steel bar binding joint is required to be provided with a hook, and the II-grade steel bar and the cold-drawn belt rib are not provided with the hook; the lap joint of the steel bars needs to be firmly tied by iron wires at the center and two ends. Binding joints between the stressed steel bars need to be staggered.

In the range from the center of any binding joint to a section 1.3 times of the lap joint length, the percentage of the section area of the stressed steel bar with the binding joint to the total section area of the stressed steel bar is in accordance with the following regulations that the tensile area is not more than 25 percent and the compression area is not more than 50 percent.

Step five: determining the strength grade of the structural concrete;

the requirements for concrete are also more stringent as the downhole pressure in the mine is manifested and the ventilation system is stringent. The design uses a concrete strength rating of C75.

Step six: pouring concrete into a steel bar formwork constructed on the top plate to prepare; the method comprises the steps of preparing pouring materials and using machines and tools required by construction, checking and commissioning all the machines and tools, preparing an emergency scheme to ensure that people, materials and objects can meet the requirement of pouring speed, ensuring the supply of water and electricity, and preventing quality accidents caused by accidents. The material supply unit is required to provide quality qualification and detection reports and actual samples of cement, sand, stone and additives in advance and provide a mixing ratio report. The folded galvanized tile template and the bracket thereof are checked to ensure that the size is correct and the strength, the rigidity, the stability and the tightness meet the requirements.

Step seven: pouring concrete in the constructed steel bar formwork and vibrating; before concrete pouring, checking the vibrating machine and the electric box to ensure that personnel and equipment are sufficient; determining the pouring sequence of concrete, starting from the farthest position and the periphery of each monomer, and pouring the concrete from the farthest position to the nearest position at one time; determining the pouring sequence of concrete, starting from the farthest position and the periphery of each monomer, and pouring the concrete from the farthest position to the nearest position at one time; personnel and machinery are particularly well prepared. Adopt the flat vibrator, there is the special messenger to be responsible for guarding and prevents leaking the vibration, and the windrow of paying attention to the concrete should not concentrate too much when pouring the flat board simultaneously, prevents that the windrow from concentrating too much, and the overweight emergence quality accident of template load is dangerous.

Step eight: and reasonably supporting the concrete regenerated roof.

After the construction of the regenerated top plate of the roadway is finished, the top plate needs to be correspondingly supported, corresponding anchor rods and anchor cables are supported according to different actual conditions on site, and the stability and the safety of surrounding rocks of the roadway are guaranteed.

In order to realize the service life of the roadway, not influence the safety of the roadway, ensure enough stability, meet the security protection and the transportation of equipment, and ensure that the underground roadway has enough fresh air, the following principles are noted when constructing the roof:

the roadway position should avoid the underground operation of the coal mine and the range of the movement of the coal mine workers as much as possible.

The position of the roadway should be selected in two hard and stable rock stratums, and a larger geological structure and a larger aquifer should be avoided; meanwhile, the thickness of the top plate of the roadway is not less than 20m, and the influence of normal mining rock stratum movement is not considered.

The roadway must be ventilated normally, and as the underground ventilation system cannot be damaged, the gap is noticed when the roof is built, and the condition of air leakage cannot be caused.

The following description is made with reference to fig. 1 for the sake of clarity and completeness of the process variant of the invention.

The method comprises the steps of determining the specific position of a roadway roof according to actual geological conditions on site, combining underground coal mine production operation and the range of activity of coal mine workers, avoiding mutual influence of coal mining activities, comprehensively analyzing stability of a main roadway, and determining the position of a reconstructed roof in the main roadway. Preferably, two sides of the roadway are arranged in the rock stratum firmed by the surrounding rock, and the roadway is rectangular.

The roadway roof adopts 25MnSi steel 3-grade steel bars with 380MPa of tensile strength as main materials, and adopts incombustible materials such as concrete and the like to pave the bottom, the thickness is 20-25m, and the requirement of the upper floor is met.

A concrete strength grade of C75 was used. The material is 3-grade steel bars, the distance from the tail end of the lap joint length of the steel bars to the bending part of the steel bars is not less than 10 times of the diameter of the steel bars, and the joint is not positioned at the maximum bending moment of the component; in the tension area, the tail end of the I-grade steel bar binding joint is required to be provided with a hook, and the II-grade steel bar and the cold-drawn belt rib are not provided with the hook; the lap joint of the steel bars needs to be firmly tied by iron wires at the center and two ends; binding joint positions among all stressed steel bars need to be staggered; in the range from the center of any binding joint to a section 1.3 times of the lap joint length, the percentage of the section area of the stressed steel bar with the binding joint to the total section area of the stressed steel bar is in accordance with the following regulations that the tensile area is not more than 25 percent and the compression area is not more than 50 percent.

The method is characterized in that pouring materials and machines and tools required by construction are fully prepared, all machines and tools are checked and operated in a trial mode, an emergency scheme is prepared to ensure that people, materials and objects can meet the requirement of pouring speed, the supply of water and electricity is guaranteed, and quality accidents caused by accidents are prevented.

The material supply unit is required to provide quality qualification and detection reports and actual samples of cement, sand, stone and additives in advance and provide a mixing ratio report. The folded galvanized tile template and the bracket thereof are checked to ensure that the size is correct and the strength, the rigidity, the stability and the tightness meet the requirements.

When concrete is poured, the height of the protective railings around the concrete is 1.1 m. When concrete is poured in the concrete, a safety belt is arranged and hung at a firm position, so that construction can be carried out. When in construction, the pouring site is equipped with enough lighting facilities.

In order to ensure that each constructor strictly follows the construction technical rules of each project, before construction and expansion, when a construction organization design is compiled, the construction technical flows are listed in key projects, and before construction, a method worker can know how to operate according to the established technical flows and corresponding construction operation rules by site intersection.

A safety management system based on a safety production responsibility system is established, and people are responsible for being managed and strictly actualized. The scaffold is provided with inspection and maintenance.

Temporary construction power utilization three-phase five-wire system and three-wire power distribution, two-stage protection and professional management. The construction machine must have three requirements (namely, a protective cover must be arranged at a transmission part, a safety device must be arranged at the transmission part, and a leakage retainer must be arranged at a switch).

The quality of the process activity conditions is actively controlled. Five major factors influencing the quality, namely a construction operator, materials, construction mechanical equipment, a construction method and a construction environment, are mainly controlled.

The method for regenerating the roof in the underground large roadway of the coal mine has the beneficial effects that:

compared with the original roof, the roof is constructed by utilizing the reinforced concrete, the influence of mining on the roof is reduced spatially, and accidents such as oil gas leakage, explosion and pollution of underground aquifers are avoided.

The roadway is completely built underground, the mine pressure is obviously displayed, the service life of the roadway can be prolonged by the regenerated roof, the repair times of the roadway can be reduced, a large amount of repair investment is saved, and the investment cost for repairing the surrounding rock of the roadway is reduced.

Compared with a primary top plate, the mechanical property of the rock is changed, and the rock is firmer and is not easy to leak air.

Compared with the original top plate, the reconstructed top plate has stronger stability, is convenient to install, is easy to manage, is easy to maintain and has lower maintenance cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.