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416results about How to "Reduce supporting costs" patented technology

Deep well tunnel cable anchor rigid-flexible coupling support and surrounding rock overall reinforced support method

The invention discloses a deep well tunnel cable anchor rigid-flexible coupling support and surrounding rock overall reinforced support method which is characterized by firstly excavating a tunnel according to the shape of cross section of the tunnel, and spraying concrete on the surface of surrounding rocks of the cross section formed by excavation; adopting a steel bar mesh and a high-strength prestressed anchor for supporting the surrounding rocks of the tunnel in time; implementing high-strength prestressed anchor cables at the center and two spandrels at the top part of the tunnel; re-spraying the concrete on the surface of the surrounding rocks of the tunnel; mounting a grouting anchor pipe on a top plate and two side surrounding rocks of the tunnel after the tunnel is excavated for 15-20d, and injecting cement slurry into fracture regions of the surrounding rocks of the tunnel; excavating a baseplate of the tunnel after the tunnel is excavated for 25-30d, mounting the grouting anchor pipe, injecting cement slurry liquid into a rock layer of the baseplate; and finally using the concrete to backfill the baseplate of the tunnel flat. The method can solve the problems of large deformation of the deep well tunnel and serious floor heave, avoid the repair work of the tunnel and have significant economic benefits.
Owner:ANHUI UNIV OF SCI & TECH

Beside-roadway escribing pressure relief method of roadway driving along gob of small coal pillar influenced by dynamic pressure

InactiveCN102778182AShorten exercise timeEliminate mining dynamic pressureBlastingEngineeringCoal pillar
The invention discloses a beside-roadway escribing pressure relief method of roadway driving along a gob of a small coal pillar influenced by dynamic pressure. The method includes the following steps: adopting roadway roof deep hole blasting as the escribing method, arranging escribing shot holes within the overall length range of an adjacent working surface crossheading of the roadway driving along the gob, and implementing stage blasting operation during back production of the working surface, wherein the escribing shot holes need to be close to the small coal pillar as far as possible, the depth of the escribing shot holes is determined according to the mining height of the back production working surface and the free caving height of the roof of the working surface, the shot holes need to be arranged with a distance away from the working surface, and the distance among the shot holes need to be determined reasonably; then performing explosive filling and hole blocking; performing ahead blasting operation in front of the working surface or lag blasting operation after the shot holes enter a gob area; and instantly performing roadway driving along the gob when the bad influence on the essence of the roadway driving along the gob of the small coal pillar caused by dynamic pressure of the working surface can be basically eliminated when back production of the adjacent working surface is finished. By means of the beside-roadway escribing pressure relief method, normal production of a back production working surface is ensured, and the cost and difficulty in roadway support along the gob are greatly reduced.
Owner:SHANDONG UNIV OF SCI & TECH

Inverse Y-shaped ventilation method for coal mining working face

The invention relates to an inverse Y-shaped ventilation method for a coal mining working face. In the method, a transportation roadway is arranged on one side of the coal mining working face; a railway roadway and a return air roadway are sequentially arranged on the other side of the coal mining working face; coal pillars are positioned between the railway roadway and the return air roadway; contact roadways are formed at certain intervals; sealed partition walls are arranged among the contact roadways; before the working face is actually mined, the contact roadways near the working face are communicated so as to form a return air contact roadway; a beside-roadway wall body is built along the border of a gob, which is close to the back of the working face; a sealing wall is constructed at the position which is 1 to 2m away from the back of the return air contact roadway so as to seal a gob-side entry and the return air roadway; when the working face is actually mined, air flow passes through the railway roadway and the transportation roadway to enter the coal mining work face and returns to the return air roadway through the gob-side entry and the return air contact roadway; and the stroke of the air flow forms an inverse Y shape. The ventilation method is characterized by simple structure and stable air flow, solves the problem of gas accumulation at the upper corner of an actual mining working face and the problem that the god-side entry is difficult to maintain, and has obvious social and economic benefits.
Owner:CHINA UNIV OF MINING & TECH +1

Support method for span reduction with double micro-arches in large-span cut-outs

InactiveCN102268998ASolve the problem of difficult to control the stability of the roofImprove top control effectTunnelsMine roof capsLong spanMonomer
The invention discloses a span-reducing support method with double micro-arches for large-span cutouts, which is suitable for span-reduction support in areas with complex structures and deep composite roofs with large-span cutouts. The secondary roadway is used instead of the first roadway, and the double micro-arch cutout is used to replace the traditional one-time long-span rectangular cutout, and the prestressed anchor/cable is used to strengthen the surrounding rock of the cutout. The distribution law of the plastic zone of the surrounding rock of the micro-arch cutout, select reasonable support parameters, give full play to the support function of the prestressed anchor rod/cable, add a row of single pillars and top beams to reduce the span support in the double micro-arch cutout protection, the top control effect is obvious. For large-span cutouts, the span reduction support method of secondary roadway formation + double micro-arch sections + anchor net cables + single pillars and hinged roof beams was adopted to solve the problem of difficult control of the roof of long-span rectangular cutouts and realize The large-span cutting eye is fast, safe and economical to construct, and its method is simple and easy to implement, with low support cost and good support effect.
Owner:SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1

Vehicle power battery pack management system integrated into electric vehicle instrument and control method thereof

The invention relates to a vehicle power battery pack management system integrated into an electric vehicle instrument and a control method thereof, and belongs to the field of integrated management of power battery packs. The vehicle power battery pack management system comprises a parameter dynamic sampling module, a heat management module, a battery state calculation module, a battery chargingand discharging management module, an instrument panel liquid crystal display module and an interface. The battery charging and discharging management module is respectively connected with a controller area network (CAN) bus and the instrument panel liquid crystal display module through the interface. The instrument panel liquid crystal display module is connected with the CAN bus. The heat management module and the parameter dynamic sampling module are also respectively connected with the CAN bus. The control method is to monitor a battery state and faults through a control program. The power battery pack management system is convenient to maintain when integrated into the electric vehicle instrument; the work reliability of the system is improved; a remote control interface of an instrument panel can change the management strategy at any time according to the working state of a power battery pack so as to guarantee that the battery pack operates in the optimal state and prolong the service life of a motor.
Owner:李玉堂

Divided mining method for inclined medium-thick ore body with unstable false roof

ActiveCN104018836AOut of stopeReduce the dilution loss rateUnderground miningSurface miningEngineeringNo removal
The invention discloses a divided mining method for an inclined medium-thick ore body with an unstable false roof. The ore body is divided into panels along the strike, ore pillars of chambers are divided in the panels and a top pillar is reserved during stoping; an outside-vein slice drift, a layered linking roadway and a trackless stope preparation project of a chute mine are distributed on the upper panel of the ore body, and an upward air roadway is filled and is distributed at a position at the center of the ore pillars of the chambers and close to the lower panel; chambers are mined firstly and the ore pillars are mined secondly in the panels, and the chambers and the ore pillars are mined in an up-down layering manner; the stoping is performed from an ore removal crossdrift, the false roof and the ore body are mined in sequence, after ores are conveyed out by a carry-scraper, the false roof at the lower sub-layer is subjected to caving in advance by shallow holes, waste stones of the false roof are reserved in a stoping field, and the ore breaking compensation height is compensated in a layering filling manner, the stoping is performed on the lower sub-layer, and the laying caving is performed on the false roof after layering ore breaking and ore conveyed out, the operation is repeated for multiple times until the stoping field is stoped completely, and the bottom layer of the stoping field is filled to close to the back. By using the method, the operating safety, high mechanical degree, no removal of the waste stones of the false roof, low production cost, and low ore dilution loss can be realized.
Owner:CENT SOUTH UNIV

Asymmetric bolt-mesh-cable combination support method for special-shaped mining roadway in large dip angle coal seam

InactiveCN102296976ASolve the characteristicsSolve the drum gang strongAnchoring boltsPre stressCoal
The invention discloses an asymmetrical bolt-net-cable combined supporting method for a special-shaped recovery tunnel of a large inclination angle coal bed. The method is characterized by comprising the following steps of: digging the tunnel according to the shape of the tunnel section, and supporting tunnel top plates, tunnel high-cut surrounding rock and tunnel low-cut surrounding rock by using prestressed anchor rods, steel bar nets and steel strips; arranging top plate prestressed anchor cables on the tunnel top plates; for the solid coal recovery tunnel, arranging high-cut prestressed anchor cables on the tunnel high-cut surrounding rock when the tunnel is dug for 5 to 7 days, and arranging struts in the center of the tunnel towards one side of the low-cut surrounding rock; and for the small coal post reserved recovery tunnel, arranging low-cut prestressed anchor cables on the tunnel low-cut surrounding rock when the tunnel is dug for 5 to 7 days, and arranging struts in the center of the tunnel towards one side of the low-cut surrounding rock. The combined asymmetrical supporting method has good application effect of stability control of the special-shaped recovery tunnel of the large inclination angle coal bed, the repair frequency of the tunnel is greatly reduced, and the supporting cost of the tunnel is reduced.
Owner:ANHUI UNIV OF SCI & TECH

Recoverable anchor rod for drilling, anchoring and grouting and supporting method thereof

The invention relates to a recoverable anchor rod for drilling, anchoring and grouting and a supporting method thereof. The anchor rod comprises a hollow grouting rod body, a nut, a gasket, a tray and a hollow threaded rod body. A drill bit is arranged at the front end of the hollow threaded rod body, and the hollow threaded rod body is provided with multi-purpose holes; the hollow grouting rod body advances inwards through threads, metal nails welded to the internal surface of the front end of the hollow grouting rod body pierce an anchoring agent package inside the hollow threaded rod body, and then, an anchoring agent is mixed and is then discharged through the holes, so as to play an anchoring role; the hollow grouting rod body is used for grouting, and slurry is exported through the multi-purpose holes, so as to cement and solidify loose coal rock bodies; and the hollow threaded rod body is snapped with the wall of a drilled hole through threads on the external surface of the hollow threaded rod body, so as to strengthen an anchoring role in end parts. The one-time drilling, anchoring and grouting supporting of loose coal rocks is realized through tightening and tensioning the tail of the hollow anchor rod, so that the difficult problem that the anchor rod dose not easily enter the loose coal and rocks caused by the fact that the loose coal rocks are subjected to hole collapsing after the loose coal and rocks are subjected to drilling is solved, the load capacity of a coal body is increased, and the supporting strength for surrounding rock of a roadway is enhanced. The recoverable anchor rod for drilling, anchoring and grouting and the supporting method thereof have the advantages of simple structure, low cost, little waste, easiness in construction, and good supporting effect.
Owner:CHINA UNIV OF MINING & TECH
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