Theory and technology of efficient roadway advance with driving and bolting integration

In order to improve the heading efficiency,the theory and technology of efficient roadway advance with driving and bolting integration is put forward. The concept of efficient roadway advance with driving and bolting integration is advanced,its rationales are consist of the high pre-stressed bolt,roof stability control in empty-sup- port roof area,rheological theory of soft rock,loose circle theory and design methods of bolt support with dynamic information,etc. By further numerical simulation and experiment,the damage deformation law of surrounding rock of efficient heading and the related law of low specific energy and high efficient cutting are discovered. For the problem of low parallel operation efficiency of comprehensive heading technology,the efficient heading system in- tegration technology is solved,some innovative equipment are developed including bolter miner,bolter conveyor, straddle bolter and flexible continuous conveyor system,etc. Then,a synchronous working line is formed with its ability to cut,bolt,convey and dust simultaneously,which makes parallel working time increase from 25% -35%to 50% -70% . The driving and bolting inte-gration technology and full width cutting technology are also solved, and a bolter miner is developed. By optimizing the cutting power,the distance between the coal face and tempora- ry roof support,the ground pressure and the utilization of kV Ac variable frequency traction drive,the problem of insufficient cutting ability and poor adaptability of foreign equipment are solved. Heavy cutting reducer by double drive and confluence at high-speed stage is developed,which realizes the cutting power of 340 kW. Forepole tem- porary support is developed,which makes the distance between the coal face and temporary roof support decrease from 1 m to 0. 4 m. Wide track chassis is designed that makes the machine ground pressure reduce from 0. 28 MPa to 0. 2 MPa. For the problem of bolting and haulage in simultaneous operations,the space multidimensional synchronization support technology is overcome. Bolter conveyor and straddle bolter are developed, multiple row support is achieved by multiple bolting rigs,the roof control of coal face is realized by using low density strength bolting,the enhanced permanent support is implemented synchronously in back area, the collaborative support system of “ dredge after close before,rapid advance” is formed. The automatic connection technology of multi-bit drill rod is obtained,and the technical problem of discontinuous drilling installation of anchor cable is solved by means of automatic continuous installation of multi-bit drill rod by manipulator and multi-carrier. In order to solve the problem of long distance lapping of belts,the flexible continuous transport system is developed,by designing core components,such as serpentine articular frame body with posture locking,offset oscillating oil and gas sus- pension,strike-type self-moving tail with anti-friction and anti-friction mechanism, and shuttle power station, which realizes the 90° turning with small radius and 150 m reciprocating lapping as well as continuous transfer. For the problem of inefficient dust prevent and control,a combination of solid,liquid and gas dust control method is put forward,which can control the dust effectively in the coal face and form a dust pool to prevent the dust from spreading. The dust removal device that can move with the host equipment is developed to realize the synchronous movement of the dust removal device and the tunneling equipment. The small-size no-keel self-acting rhombic bag filtration technology is obtained,and the fully automatic compact bag filter for mining is developed that makes the total dust removal rate up to 99. 7% . The technologies of surface super-hydrophobic modification of filter screen and two-stage linear gas-liquid separation are obtained,and the airborne wet negative pressure precipitant for min- ing is developed. The application shows that comparing with the original heading method,the heading speed is in- creased by 1 -2 times under the condition of stable surrounding rock and medium stable surrounding rock.