96results about How to "Reduce blasting costs" patented technology

The invention discloses a deep-hole blasting construction technology in fractured rocks. The technology comprises the following steps: firstly finding out information such as joint fracture occurrence in the inner wall of a blasting hole, development degree, space position by utilizing a drilling camera shooting technology; and then carrying out optimization design for blasting parameters, such as explosive load of a blasting hole, explosive load structure, the length of an explosive roll, blasting sequences according to the storage condition of the joint fracture in each blasting hole, thus the aim to improve the blasting effect, reduce the effect of blasting quality by the fracture and reduce the blasting cost is realized. The technology provided by the invention is especially suitable for a medium-deep hole blasting construction technology of soft cracked crocks of joint fracture of underground metal ores, the effect degree for blasting quality by joint fracture of the crocks can be reduced effectively, the damage to surrounding rocks by the blasting shock is reduced, the damage caused by shock waves to surrounding drill holes is reduced, and the blasting cost is saved.

The invention relates to a method for peripheral hole non-coupling continuous loading. According to the method, under the condition that spaced loading and detonation of a detonating cord are not adopted, the feature that emulsion explosives can be conveniently shaped is made use of and non-coupling continuous loading is achieved in the axial direction of a blast hole by regulating the loading diameter through a PVC pipe and in strict accordance with the designed peripheral hole cord loading density. Reversed detonation of a hole bottom blasting cap is used for achieving the aim of smooth detonation. Compared with a traditional method, non-coupling continuous loading is carried out on a peripheral hole, so that explosive energy in the hole can be distributed more evenly. Local damage to the wall of the hole by a cartridge bag is controlled and the smoothing effect is more obvious. Meanwhile, due to the fact that reversed detonation of a hole bottom is adopted, a detonating cord does not need to be arranged on the peripheral hole, the cost of smooth detonation is greatly reduced. In addition, the PVC pipe has good flexibility, the PVC pipe serves as an auxiliary material to make a loading body, and the method is suitable for blast hole loading of different depths and easy and convenient to operate.

The invention relates to a blasting method for a bridge cylindrical pile base with the pile base diameter of 1.7-1.9 m. The blasting method includes the steps of drilling holes, loading explosive materials, blocking a cannon opening and triggering blasting. According to a hole drilling method, a central hole is vertically formed along a central line of the cylindrical pile base, a cannon opening inner ring with a radius of 0.13-0.17 m is formed with the central line of the cylindrical pile base as the center, a cannon opening middle ring with a radius of 0.43-0.47 m is formed, a cannon openingouter ring with a radius of 0.78-0.82 m is formed, and 4 vertically formed cutting holes are evenly distributed in the cannon opening inner ring, 6 vertically formed auxiliary holes are evenly distributed in the cannon opening middle ring, and 14 obliquely formed peripherical holes are evenly distributed in the cannon opening outer ring; the included angle between the central axis of each peripherical hole and the vertical direction is arccot10-arccot12, and the distance between the top of each peripherical hole and the central hole is smaller than that between the bottom of each periphericalhole and the central hole. The blasting quality is high, the construction efficiency is high, and the blasting cost is low.

The invention discloses a method for sandblasting the surface of a workpiece by utilizing steelmaking converter slag, and belongs to the technical field of comprehensive utilization of the steelmaking converter slag. The method comprises the following steps: 1, converter slag pretreatment: adding a flux into a converter at the final converter steelmaking stage to carry out converter slag pretreatment; 2, converter slag air quenching treatment: sending liquid converter slag into an air quenching treatment station through a slag tank vehicle, allowing the liquid converter slag to flow out of a tundish, blowing through air injected through a Laval nozzle, and crushing to particles; 3, converter slag sorting treatment: carrying out three-level sorting of the obtained magnetically-separated converter slag particles; and 4, sandblasting, wherein sandblasting nozzles comprise a center nozzle and circumferential nozzles, 3-5 circumferential nozzles are uniformly distributed in the periphery of the center nozzle, and each of the center nozzle and the circumferential nozzles is a Venturi nozzle. The steelmaking converter slag has the advantages of good abrasive crushing resistance, benefiting for the recycle, realization of the circulating frequency reaching 10, and great reduction of the sandblasting cost as a sandblasting abrasive.

The invention discloses a covering layer forming method of blind ore bodies with stable and massive roof surrounding rocks applying a bottom pillar-free subsection collapse method. The method can obviously reduce the work quantity of caving, has low caving cost and a little ore dilution, and improves the production efficiency and economic benefit of mines. The key points of the technical scheme are as follows: a first subsection mining tunnel is distributed in an ore body, and continuous gobs provided after the first subsection mining are used for inducing the roof rocks to collapse; and with the performing of the mining work, the areas of the gobs are expanded continuously, when the areas of the gobs reach the critical exposed area, the roof rocks at the gobs are unstable gradually and collapsed under the effects of stress and gravity so as to form a covering layer. When the first subsection mining tunnel distributes blast holes, the ore bodies among the access roads are required to be thoroughly collapse so as to cut off the support of the roof surrounding rocks completely and form continuous gobs with exposed area. The forming method is applicable to forming the covering layer of more stable and massive blind ore bodies of the roof surrounding rocks.

The invention relates to a hole plug, in particular to an open pit mined-out area through hole plug and a through hole plugging method thereof. The upper end of an upper wood wedge (2) is a plane, the lower end of the upper wood wedge (2) is an inclined plane (4), and an iron wire (1) through hole (3) is formed from the center of the upper end plane of the upper wood wedge to the center of the lower end inclined plane; and one end of a main wood wedge (6) is a plane, the other end of the main wood wedge (6) is an inclined plant, and an iron wire through hole is formed from the upper part of the main wood wedge (6) to the lower part of the wood wedge (6), an iron nail (5) is arranged on any side of a through hole in the lower part of the wood wedge (6), and the lower end of the iron wire is fixedly connected with the iron nail and then the iron wire passes through the through hole in the main wood wedge and the through hole in the upper wood wedge. The open pit mined-out area through hole plugging method comprises following steps: pretreating the through hole; measuring hole diameter; making a plug; mounting the plug; filling explosive; and exploding. In the invention, the trees influencing exploitation in during mining area exploitation are fully used, the waste is changed into valuable materials, explosive is saved, explosion cost is saved, and through hole plugging time and labor force are reduced.

The invention discloses a radial vacuum spaced charging device with active pressure relief, and the radial vacuum spaced charging device comprises an outer cavity (6). The radial vacuum spaced charging device is characterized in that a vacuum dielectric layer (5) is arranged between the outer cavity (6) and an inner cavity (4), both ends of the vacuum dielectric layer (5) are sealed by sealing plates (1), the inner cavity (4) is filled with explosives (3), and an air dielectric layer (2) is arranged above the explosives (3). According to the radial vacuum spaced charging device, the problem that an ideal blasting effect cannot be achieved due to great pulverization effect of rocks in a pulverization area, large early energy consumption and non-ideal effective utilization rate of explosive energy because the explosive energy cannot be effectively discharged in time after explosion due to narrow sealed space in a blast hole by utilizing water or air as spaced media in the prior art is solved.

The invention discloses a pre-split blasting combined explosive charging method, an explosive charging structure and an auxiliary device. The combined explosive charging method is characterized in that forming grains and forming spacer columns are combined through screwing connection, and are supported at the auxiliary device at an opening of a blast hole, so that the forming spacer columns are supported at the opening of the blast hole, then the forming spacer columns form a connection foundation, and then at least two explosive charging sections and at least one spacing section are formed inthe blast hole; the explosive charging structure is composed of the forming grains and the forming spacer columns, moreover, energy gathering grooves are formed in the forming grains, detonating cordgrooves are formed in the forming grains and the forming spacer columns, and the inner threads and the outer threads with the same specification are correspondingly arranged at the two ends of the forming grains and the two ends of the forming spacer columns, so that an explosive charging module is formed; and the auxiliary device is used for supporting the forming spacer columns with the annulargrooves in the middles in the opening of the blast hole so as to form the follow-up explosive charging connection foundation. The pre-split blasting combined explosive charging method, the explosivecharging structure and the auxiliary device have the beneficial effects that the explosive charging method can effectively recue the labor intensity, save the labor and improve the efficiency; and theauxiliary device for the explosive charging structure provides a guarantee for achieving modular explosive charging.

The invention discloses a water delivery tunnel whole-section one-time blasting forming construction method. The water delivery tunnel whole-section one-time blasting forming construction method comprises following steps that firstly, a blasting center hole, a breaking-in hole, an auxiliary hole, a periphery hole and a bottom plate hole are determined in the face of a tunnel, and drilling is carried out on the corresponding position; secondly, an ammonium nitrate fuel oil mixture is loaded in blast holes of the breaking-in hole and the auxiliary hole, a continuous coupling charging structure is adopted, hydrogel explosive is arranged in blast holes of the periphery hole and the bottom plate hole, and a continuous non-coupling charging structure is adopted; thirdly, explosive non-electric millisecond detonators are connected to form a blast network, and connected to the position outside the holes, and blasting excavation is achieved. The ammonium nitrate fuel oil mixture is adopted to serve as main blasting explosive, the hydrogel explosive serves as the auxiliary detonating explosive, in combination with the non-electric millisecond detonators, the blasting sequence is strictly controlled, the blasting effect and the construction proceed are improved, combination of the ammonium nitrate fuel oil mixture and the hydrogel explosive is adopted, the cost of each meter of a footageblasting device is reduced obviously, and the blasting cost can be effectively reduced.

The invention provides a high-power water gel explosive applicable to a coal mine. The high-power water gel explosive comprises the following substances in parts by weight: 30-45 parts of 75-86% nitric acid-methylamine water solution, 28-38 parts of powdery ammonium nitrate, 7-14 parts of sodium nitrate, 5-12 parts of efficient blast reducer, 0.1-1.5 parts of aluminium powder, 0.6-1.4 parts of sesbania powder, 1-3 parts of air bubble carriers, 0.2-0.4 part of cross-linking agent and 0.1-0.3 part of fluorizating protein. The power of the water gel explosive achieves the level of an existing second-stage water gel explosive applicable to the coal mine, and the safety meets the requirement of the existing second-stage water gel explosive applicable to the coal mine, so that the water gel explosive provided by the invention can be used for obviously improving the embrasure utilization ratio and lowering the blasting cost during high gas coal mine blasting operation.

The invention relates to a non-electric coupling multi-section differential detonating circuit. The technical scheme is as follows: a primary circuit detonating cord (2) is arranged between every two rows of blast holes (5) in a working surface; hole inlet branch circuit detonating tubes(4), nonel detonators and cartridge bags are packed into each row of the blast holes (5); two blast holes (5) which take a primary circuit detonating cord (2) as a symmetric axis are in cluster parallel connection with the primary circuit detonating cord (2) through the hole inlet branch circuit detonating tubes(4) in the holes; each primary circuit detonating cord (2) is in cluster parallel connection with a trigger device (1); a primary circuit millisecond delay detonator (3) is arranged on each primary circuit detonating cord (2); each circuit millisecond delay detonator (3) is subjected to differential accumulation according to the delay time of 100-200 ms sequentially; nonel detonators among every 1-3 blast holes (5) are subjected to differential accumulation according to the delay time of 25-50 ms; and the delay time of nonel detonators of two symmetric blast holes (5) which are cluster parallel connection with each primary circuit detonating cord (2) is 25-50 ms. The non-electric coupling multi-section differential detonating circuit has the characteristics as follows: the detonation is reliable, and the detonating circuit is economically feasible.

The invention discloses an exciter for a detonating tube. The exciter for the detonating tube comprises a fixed part and an inserting part, wherein an inner thread is arranged at one end of the fixed part, and a fixed hole is formed in the other end of the fixed part. The fixed hole and the inner thread are communicated through a cavity. The inserting part is a circular cylinder, wherein an axis core is provided with a through hole. An outer thread which corresponds to the inner thread is arranged outside the inserting part, and the through hole of the inserting part is communicated with the cavity. According to the exciter for the detonating tube, a shock wave principle is utilized, and an electric firing component is placed inside a sealed cavity. A high-temperature shock wave is generated in the cavity by detonating the electric firing component, and thereby the detonating tube is detonated, and a detonator is set off. The exciter for the detonating tube is easy to achieve and capable of being reused, and thereby the detonating cost can be lowered.

The invention relates to a blasting method for a bridge cylindrical pile foundation with a pile foundation diameter of 1.1-1.3m. The blasting method comprises the steps of drilling, filling explosives, blocking a blast hole and detonating, wherein the drilling step comprises the following steps of: vertically forming a central bull hole along a central line of the cylindrical pile foundation, forming a blast hole inner ring with a radius of 0.13-0.17m by taking the central line of the cylindrical pile foundation as a center, forming a blast hole outer ring with a radius of 0.48-0.52m by takingthe center line of the cylindrical pile foundation as the center, uniformly distributing four slotting holes which are vertically distributed in the blast hole inner ring, and uniformly distributing10 peripheral holes which are formed in an inclined mode in the blast hole outer ring, wherein included angles between the center axes of the peripheral holes and the vertical direction are arccot10-arccot12, and distances from the hole tops of the peripheral holes to the hollow bull hole are smaller than those from the hole bottoms of the peripheral holes to the hollow bull hole. The blasting method is high in blasting quality, is high in construction efficiency, is low in blasting cost, further can alleviate damages, on a pile hole protective wall, of blasting vibrations and flying rocks, and prevents the flying rocks from damaging construction equipment.

The invention relates to the technical field of engineering blasting, in particular to a high and steep slope blasting comprehensive protection device and method. The device comprises a first protection device body, a second protection device body and a spraying dust preventing device; the first protection device body comprises a first fixed supporting frame, a steel channel bottom frame and an inclined supporting frame; a triangular space is formed among the first fixed supporting frame, the steel channel bottom frame and the inclined supporting frame; the triangular space is filled with a protective bag; the second protection device body comprises a second fixed supporting frame and a protective net; and the spraying dust preventing device comprises a spraying pipe and a spraying head. The high and steep slope blasting comprehensive protection device is simple in structure, easy to operate, low in cost and convenient to construct, guarantees that blasting of a high and steep slope is fast and effectively performed, economic construction is accelerated, and an important role is achieved for creating good economic benefits, environmental benefits and social benefits.

The invention discloses a deep hole dust suppression blasting method in a strip mine. The method includes the following steps of firstly, designing a hole pattern and arranging holes; secondly, punching holes; thirdly, detecting and measuring blast holes before explosives are loaded; fourthly, filling the explosives; fifthly, placing water bags; and sixthly, connecting a network and initiating theblasting. By means of the deep hole dust suppression blasting method in the strip mine, the dust concentration is reduced after blasting, and the environmental protection is facilitated; safety is improved, and the blasting vibration and flying rock are obviously reduced; zero bottom rock is produced, the top bulk rate is reduced, and the cost for secondary disposing bottom rock and top bulk is saved; and the consumption of the explosives is reduced, and the blasting cost is reduced.

The invention relates to a blasting method for a bridge cylindrical pile foundation with the diameter being 0.8-1 m. The blasting method includes the steps of hole drilling, explosive material charging, blast hole opening blocking and detonating. According to the step of hole drilling, a central empty hole is vertically formed along the central line of the cylindrical pile foundation, a blast holeinner circle is formed with the central line of the cylindrical pile foundation as the center and with the radius of 0.13-0.17 m, a blast hole outer circle is formed with the central line of the cylindrical pile foundation as the center and with the radius of 0.33-0.37 m, four vertical grooving holes are evenly distributed in the blast hole inner circle, and nine inclined peripheral holes are evenly distributed in the blast hole outer circle. The included angle between the central axis of the peripheral holes and the vertical direction is arccot 10-arccot 12, and the distance from the tops ofthe peripheral holes to the central empty hole is smaller than the distance from the bottoms of the peripheral holes to the central empty hole. According to the blasting method for the bridge cylindrical pile foundation with the diameter being 0.8-1 m, blasting quality is high, construction efficiency is high, blasting cost is low, damage of blasting shock and flying stones to a pile hole protective wall can be reduced,, and flying stones are prevented from damaging construction equipment.