36results about How to "Increase free surface" patented technology

The invention relates to a multi-row micro-differential roadbed deep hole blasting construction method, which comprises the following steps of: (1) selecting blasting parameters; (2) calculating security; (3) arranging a stair and a free face; (4) distributing holes and drilling holes; and (5) blasting. The blasting method is a multi-row deep hole millisecond micro-differential blasting method; and the blasting is performed by pull trough blasting and side slope blasting in a roadbed sequentially, wherein the pull trough blasting is loose blasting and the side slope blasting is precraking blasting. In the method, a shock conducting tube non-electric priming system micro-differential control blasting technology, a comprehensive blasting construction scheme of loose blasting, the deep hole millisecond micro-differential blasting technology and the roadbed side slope precraking blasting technology, and a wide-pitch and low-resistance hole distribution mode are adopted, so that explosivesand detonators are saved, the drilling mechanization degree is enhanced, the labor cost is reduced, the blasting effect is enhanced, the large rate of blast rocks is reduced, the material abandoning rate is reduced and harms of blasting vibration, impact waves, flying stones and the like are reduced; furthermore, when the blasting effect is enhanced and the stability of the blast roadbed side slope rocks is guaranteed, the absolute safety of blasting can be guaranteed.

A bearing body (2) is divided in the radial direction (r) by at least one insert (6) arranged in the bearing body (2) parallel to the bearing axis (12) into at least two spring packets (7, 8) having an outer switching packet (8). Each of the working chambers (4, 4′) is divided into several chamber sections (91-9n) extending in the radial direction (r) and into at least one chamber section (10) extending in the axial direction (a) and connecting the chamber sections (91-9n) with one another. The elastomeric bearing body (2) is segmented in the switching packet (8) in the axial direction (a) by the chamber sections (91-9n) protruding into the elastomeric bearing body (2).

The invention discloses a coal mining method for separate mining of coal and gangue in a thick gangue-containing coal seam. It is characterized in that the upper, middle and lower troughs are respectively arranged on the upper, middle and lower parts of the longwall coal mining face, and the coal mining face is divided into upper and lower sections, and the upper part of the working face is equipped with a conventional working face self-moving hydraulic support, The roof is managed by the caving method, and a normal scraper conveyor is supplemented. The motor is placed on the upper end of the working face and transported downward. The mined coal and gangue are transported downward to the gangue in the Zhongshun trough by the scraper conveyor. Separation platform; the length of the lower section of the working face is just enough to fill the gangue extracted from the working face and the lower section in the goaf, and a self-moving hydraulic filling support with a goaf retaining board is installed, and the filling method is adopted Management of the roof, supplemented by a high-power short-distance scraper conveyor, the motor is placed at the lower end of the working face, and transported upwards, the mined coal and gangue are transported upwards to the Zhongshun trough for coal and gangue separation by a high-power short-distance scraper conveyor tower.

The invention discloses a cutting blasting method suitable for excavation of high-plastic and low-strength rock tunnels, which is improved from two aspects of reducing the distance between the cutting holes and changing the charge structure of the cutting holes, and reduces the distance between the cutting holes. distance to ensure that the explosion stress wave energy produced by the explosive is much higher than the energy required for the plastic deformation of the plastic rock mass during the explosion, and the design of the auxiliary cut hole provides support for effectively expanding the cut cavity; the cut of the present invention The method is to arrange the nine holes of the main cutting hole, the center hole is filled with medicine, and the remaining eight holes are all empty holes. The auxiliary cutting holes are arranged in the upper, lower, left and right directions of the central nine holes and the four corners of the peripheral square. Cutting blasting is carried out by combining a small number of charging holes and a large number of empty holes, which improves the blasting efficiency, reduces the unit consumption of explosives, and improves the blasting effect of cut holes.

The invention provides a thick ore body mining method. A thick ore body refers to an ore body thicker than 5m. According to a chamber type filling mining technique, upper and lower passages are respectively constructed in the middle and on two sides of a chamber along a cutting direction, roof cutting is performed towards the upper passage along a stoping line, a roof and side wall bolting nets are subjected to shotcrete supporting, and the lower passage are descended towards two sides along the stoping line and filled. The method includes steps of upper roof cutting, lower step descending, hierarchical segmented blasting, deslagging and loading, lower wet filling and upper cementing roof connection. By means of stepped full-layer descending mining, a free face is widened to increase blasting efficiency while material consumption caused by secondary descending is avoided, explosive consumption is reduced by 0.12Kg / t, detonator consumption is reduced by 0.11 detonator per t, and consumption of steel chisels and drills is reduced by 0.02Kg / t.

The present invention provides a construction method for blasting frozen soil of large-diameter shafts in deep alluvial layers. The construction method includes the following steps: step S1, the shaft is constructed by freezing method; according to the design range of shaft excavation diameter, two circles of cutting holes are excavated from the inside to the outside , four circles of auxiliary holes and one circle of peripheral holes; the four circles of auxiliary holes are successively auxiliary holes three, auxiliary holes four, auxiliary holes five and auxiliary holes six from the inside to the outside, and one circle of peripheral holes is peripheral hole seven; step S2, drilling After the hole is formed, use a high-pressure air gun to clear the hole; step S3, fill the cutout hole, auxiliary hole and peripheral holes from the bottom of the hole to the hole opening and fill the energy-concentrating tube and loess blasting clay in sequence. The loess clay is filled with water clay, and the outer peripheral surface of the energy gathering tube is provided with a slit along the axial direction, the length of the slit is less than the axial length of the energy gathering tube, and the slit is far away from the axial ends of the energy gathering tube; Step S4 , detonate the cut hole, the auxiliary hole, and the peripheral hole sequentially from the inside to the outside.