39results about How to "Reduce supporting costs" patented technology

The invention relates to the field of constructional engineering, and discloses an assembly type reinforced concrete-steel structure foundation pit supporting system convenient to disassemble and a construction technology, and the assembly type reinforced concrete-steel structure foundation pit supporting system comprises a top beam, a waist beam, a supporting pile and an inner supporting system; the inner supporting system is formed by assembling a standard steel-concrete beam section main support and a steel member auxiliary support in cooperation with a jack adjusting system. The invention further provides a new system on-site assembly construction process, namely detailed steps of assembly construction from the uppermost layer to the lower layer step by step. The fabricated structure integrates the advantages of two fabricated structures, is suitable for foundation pit supporting with large stress and strict deformation control, and has the advantages of being high in construction speed, short in construction period, low in construction cost, convenient to dismantle and capable of completely recycling most of inner supporting components compared with a traditional cast-in-place steel-concrete foundation pit supporting system.

The invention belongs to the technical field of optical cable preparation and intelligent manufacturing, and particularly relates to a loose tube containing light-weight chemical fiber paste, an optical cable and a light-weight chemical fiber paste coating method. According to the loose tube containing the light chemical fiber paste, the optical fiber and the multiple layers of fiber paste on the surface of the optical fiber are arranged in the loose tube, and the coated multiple layers of fiber paste are divided into the inner-layer fiber paste, the middle-layer fiber paste and the outer-layer fiber paste in the direction away from a fiber core of the optical fiber; wherein the content of bubbles in the inner-layer fiber paste and the content of bubbles in the outer-layer fiber paste are both lower than the content of bubbles in the middle-layer fiber paste, and the viscosity of the inner-layer fiber paste and the viscosity of the outer-layer fiber paste are both higher than the viscosity of the middle-layer fiber paste. The loose tube containing the light chemical fiber paste provided by the invention is qualified in various performances, can integrally reduce the use amount of the fiber paste by 10-15%, can reduce the consumption of petrochemical products, can reduce the weight of an optical cable and the matching cost, saves resources, and is environment-friendly.

The invention relates to the technical field of mine engineering support, and discloses a fixing device for mine engineering support, which comprises a support mechanism used for keeping a connecting assembly stable and preventing surrounding rock in spaces such as roadways or stopes from deforming and collapsing; the connecting assembly is located above the supporting mechanism and used for better bearing and dispersing surrounding rock pressure. The connecting mechanism is arranged on the outer side of the connecting assembly and used for connecting and fixing the connecting assembly to increase stability. The shock isolation mechanism is located above the connecting assembly, and a blocking net is arranged above the shock isolation mechanism and used for reducing the influence of vibration on the stability of the support and the surrounding rock. The supporting support displacement caused by mine vibration is prevented through the shock isolation mechanism, the height of the supporting mechanism is adjusted through the adjusting assembly, the arc plate and the blocking net work cooperatively, fixing is conducted through the expansion screw, the safety accident risk is reduced, the resource utilization efficiency is improved, the cost is reduced, the temperature, humidity and vibration data in a roadway are monitored through the display assembly, and production safety is guaranteed.

The invention provides a gob-side entry retaining method suitable for a mining roadway of a soft broken roof, and relates to the technical field of soil layer or rock drilling and mine safety. The method specifically comprises the following steps: determining the area range of the soft broken roof, constructing an anchor net cable or a shed frame in a roadway to reinforce and support the area of the soft broken roof, constructing an anchor cable on one side of solid coal to exert horizontal constraint on surrounding rock after top cutting and roadway retaining, and arranging two paths of unit brackets to be connected with an anchor cable beam during stoping; wherein a directional kerf blasting pre-splitting mode is adopted for roof cutting, and large-diameter drilling pre-splitting blasting roof breaking is constructed in an overlying shear roof while blasting roof cutting is conducted on a lower rock stratum; after mining, retaining and protecting measures are taken beside the roadway in the dynamic pressure roadway, a retained roadway withdrawing scheme is determined in a stable area, a non-withdrawing area, a withdrawing area and an observation area are divided, cyclic utilization of supporting materials is guaranteed through ordered withdrawing of temporary supports, the cost can be saved, the carrying distance can be saved, and the production efficiency can be improved.

The invention relates to the field of constructional engineering, and discloses an assembly type mixed foundation pit supporting system. According to the system, I-shaped, T-shaped and cross-shaped reinforced concrete beam sections are used as a framework of an inner support and are matched with a steel structure auxiliary support to form an inner support system, the three reinforced concrete beam sections are connected only through axial nodes, a plurality of steel latticed columns are arranged in the middle of the inner support system, and a jack is arranged between the inner support system and a top beam or a waist beam; the invention further provides a construction method of the assembly type mixed foundation pit supporting system. The construction period is short, and the inner supporting system is flexible and diverse in plane arrangement structure and can be used for various occasions; the basic parts are manufactured in advance and can be recycled for multiple times, and the whole-life carbon emission and the cost are lower.

The anchor rod with the memory function comprises a rod body, a temperature control device and a plurality of deformable shape memory alloy pieces, the temperature control device is connected with the shape memory alloy pieces through temperature control wires and controls the temperature of the shape memory alloy pieces, and the temperature control device controls the shape memory alloy pieces to change between two forms. The system further comprises a monitoring device used for receiving signals of the strain sensors, and the monitoring device and the strain sensors are connected through monitoring wires. The anchor rod is simple in expansion mode, small in influence on pore water pressure of a soil body and small in disturbance to a soil layer; friction force can be adjusted and increased in time, short-time rapid supporting is achieved, slope stability is maintained, and time is won for rescue and relief work; the device is high in assembly degree, simple, practical, light, high in strength, economical and environment-friendly; and the recycling function can be achieved, the rescue and disaster relief cost is greatly reduced, geological parameters can be monitored, and the use convenience degree and the working efficiency are high.

This utility model relates to the field of construction, specifically a steel plate connection structure for primary and secondary beams. The secondary steel-concrete composite beams are symmetrically arranged on both sides of the primary steel-concrete composite beam, forming a cross-shaped arrangement. The primary steel-concrete composite beam is horizontally fitted with upper and lower flange connecting plates, corresponding to the heights of the upper and lower pipe walls of the secondary steel-concrete composite beams, respectively. The two end faces of the upper and lower flange connecting plates support the upper and lower pipe walls of the secondary steel-concrete composite beams from bottom to top. This utility model significantly improves the construction efficiency of connecting primary and secondary beams and has a simple structure.

This invention relates to the field of foundation pit support design technology, and provides a foundation pit support design method and system based on digital twins. The method includes: establishing a digital twin related to the foundation pit and support; constructing a corresponding change curve from the foundation pit excavation data; substituting the curve into the digital twin to predict the mechanical parameters of the foundation pit sidewall at the unexcavated depth, thereby obtaining second soil layer change prediction data; judging the future support requirements changes at various points in the foundation pit based on the second soil layer change prediction data and real-time foundation pit support data, and adaptively reinforcing the foundation pit support using coordinates, thereby reducing foundation pit support costs and improving the efficiency of excavation-as-you-go support.

The utility model relates to the technical field of double-row pile supporting, and discloses a double-row pile supporting device which comprises a cast-in-place pile, a jet grouting pile, a cantilever pile, a stand column and a supporting beam, the jet grouting pile is located in the cast-in-place pile, the top of the jet grouting pile and the top of the cast-in-place pile form an upper crown beam, and the stand column and the cantilever pile are arranged in an up-down butt joint mode. One end of the supporting beam is in butt joint with the upper crown beam, the other end of the supporting beam horizontally extends in the direction away from the upper crown beam, and the top of the stand column is in butt joint with the supporting beam. During supporting operation, the upper portion is supported through cooperation of the cast-in-place piles and the jet grouting piles, the lower portion is supported through the cantilever piles, a shared supporting structure is formed through cooperation of the stand columns extending upwards and the supporting beams, the supporting strength of the supporting device is improved, meanwhile, construction is easy and convenient, the supporting service life is long, in addition, the stand columns can be recycled, and the supporting cost is reduced.

This utility model discloses a prefabricated ribbed floor slab hoisting and forming structure, belonging to the field of building formwork. The structure includes a building formwork, a support assembly, a steel truss, and a hoisting assembly. The support assembly uses a non-full-span scaffolding with a central gap; the building formwork has flanges with hoisting slots and connection holes on its sides, which can be quickly connected into an array using fasteners; the steel truss spans the gap area and is erected on the flanges of two adjacent rows of formwork; the hoisting assembly includes an upper support, double-ended bolts, washers, and nuts, passing through the merged hoisting holes from top to bottom to transfer the formwork load to the steel truss, which is ultimately supported by the scaffolding on both sides. This utility model reduces the span of the steel truss by using a "span-for-support" approach, thus lowering its selection specifications and costs; the hoisting assembly is detachable and adjustable, offering flexible use; both the formwork and hoisting are prefabricated, greatly improving construction efficiency and reducing overall costs.

The invention discloses a practical index calculation system for a WEB system in an enterprise, and the calculation system comprises a main control terminal which is connected with a data collection module which is used for continuously collecting original behavior data generated in the process that a user browses the WEB system during the operation period of a browser extension program; the recording module is used for recording key behavior frames of a user, meanwhile, a WEB system administrator carries out a series of page element clicking operations on the system in the mode, and software can record a DOM path (xPath) and an id value of each clicked operation element in the WEB system administrator. The satisfaction degree of the user to products or services can be remarkably improved, and then front-side word-of-mouth spreading is promoted; emotional connection between the user and the brand can be established through high-quality user experience, the user is prompted to become a return customer, the long-term loyalty of the user is improved, and a solid foundation is laid for sustainable development of enterprises.

The utility model provides a deep foundation pit slope protection device which relates to the technical field of building construction, is installed on a slope and comprises a plurality of anchoring parts and a protection plate, each anchoring part comprises a base plate, an anchor rod and a cross-shaped connecting frame, the anchor rod is arranged at the bottom of the base plate and used for penetrating into the slope, and the cross-shaped connecting frame is arranged on the base plate. The connecting frames are arranged at the top of the base plate, the four corners of each connecting frame are correspondingly connected with the four protective plates, the corners of each protective plate are provided with L-shaped connecting plates matched with the corners of the connecting frame, the connecting frames and the connecting plates are provided with corresponding fixing holes, and fixing bolts penetrate through the connecting frames and the connecting plates to connect the connecting frames and the connecting plates. According to the deep foundation pit slope protection device, the modularized anchoring parts, the protection plates and the reinforcing assemblies are adopted, the suitable number of modules can be assembled according to the depth and length of a slope during installation, meanwhile, the anchoring parts, the protection plates and the reinforcing assemblies are connected through simple bolts so that installation and disassembly are convenient, and the anchoring parts, the protection plates and the reinforcing assemblies can be repeatedly used after being disassembled; and the support cost of the side slope can be greatly reduced.

The present invention provides a tracking mechanism for welding spiral ribs in a cylinder, comprising a lifting slide, a guide wheel mechanism, a horizontal slide, a horizontal cylinder and a vertical cylinder, wherein the lifting slide is longitudinally slidably connected with a longitudinal slide plate, and the top of the longitudinal slide plate is connected to the vertical cylinder drive through a window opener chain; the horizontal slide is installed on the lifting slide, and two groups of transverse slide plates are transversely slidably connected thereon, and two groups of guide wheel mechanisms are correspondingly installed on the two groups of transverse slide plates, and a horizontal cylinder is also connected between the two groups of transverse slide plates; the guide wheel mechanism comprises a guide wheel body and a rotating shaft for installing the guide wheel body on a guide wheel bracket, and a welding gun adjustment mechanism is installed on at least one group of transverse slide plates, and a welding gun adjustment mechanism is installed on a welding gun body for welding the spiral rib plates in the cylinder. The present invention can be matched with an automatic welding machine to realize automatic welding of spiral rib plates in the cylinder, and the matching cost is low and the adjustment adaptability is better.

The invention relates to the technical field of coal mine roadway surrounding rock reinforcement, in particular to a small coal pillar gob-side roadway surrounding rock stability control method which comprises the following steps: establishing four immediate roof fracture mechanical models; calculating correlation among direct roof shearing force, bending moment and deflection; judging the type of the mechanical model to which the small coal pillar gob-side roadway belongs; calculating a mathematical relationship between the maximum value of direct roof deflection and the supporting force of the small coal pillar; carrying out primary loading on a plurality of rock samples, coal samples and a plurality of groups of grouting reinforcement material consolidation samples, and carrying out secondary loading on a grouting coupling test body by adopting an orthogonal test; obtaining an optimal grouting reinforcement material, consolidation time and an injection rate; establishing a gob-side roadway small coal pillar grouting reinforcement numerical model through FLAC3D, and simulating the gob-side roadway small coal pillar grouting reinforcement numerical model; an optimal grouting layout scheme is obtained through a simulated annealing algorithm; determining an optimal grouting reinforcement scheme; test and simulation are combined, support reinforcement parameters are scientifically evaluated, the stability of the surrounding rock of the small coal pillar gob-side roadway is effectively controlled, the method is simple, and the cost is low.

The invention provides an IC chip test system and method, the test system mainly comprises a test control unit, a test management unit and a test execution unit, the test control unit is connected with the test management unit through a network, and the test management unit is connected with the test execution unit through a concentrator; the test execution unit comprises a programmer and a tested device, the input end of the programmer is connected to the concentrator, the output end of the programmer is connected to the tested device, the tested device is integrated with function boards of different types of IC chips, and the function boards carry a plurality of peripheral drive hardware circuits. According to the invention, the chip type selection and verification period can be shortened, and the labor cost and the software and hardware matching cost are reduced.

This invention belongs to the technical field of mine support materials and preparation processes, specifically involving a composite inorganic sprayed slurry made from gasified slag and a preparation process for low-resilience, high-strength mine support. The sprayed slurry is a pure inorganic component, composed of activated gasified slag, ordinary silicate cement, auxiliary cementitious admixtures, and functional additives in specific mass proportions. The activated gasified slag undergoes alkali activation or thermal activation treatment, without using saline wastewater. The preparation process includes gasified slag pretreatment and activation, dry powder premixing, slurry preparation, high-pressure spraying support, and natural curing. This invention achieves high-volume utilization of gasified slag, solving problems such as saline wastewater activation, the presence of organic components in the sprayed slurry, and insufficient resilience and strength in existing technologies. It is suitable for various types of mine roadway support.

The invention discloses a method for detecting the depth and inclination of a drilled hole based on laser ranging and an electronic compass, and relates to the field of engineering measurement. The method comprises the following steps: step 1, opening a measuring device; step 2, inputting allowable extreme values of allowable deviations of the designed drilling inclination, the inclination angle, the actual drilling hole bottom and / or the hole distance; step 3, turning on a laser emission button; 4, when the laser ranging result is the maximum ranging result, a reading button is pressed down; 5, the included angle between the designed drill hole and the actual drill hole, the drill hole deviation and / or the hole bottom offset distance are / is calculated; comparing the drill hole deviation and / or the hole bottom offset distance with an allowable extreme value of the allowable deviation; judging whether the drilled hole is qualified or not; ending the measurement; according to the invention, the integrated measurement of the hole depth and the hole inclination is realized, the operation is simple and fast, and the measurement and inspection efficiency is greatly improved. The invention further relates to a device for detecting the hole depth and hole inclination of the drill hole based on laser ranging and the electronic compass.

The utility model provides a kind of multi-head adjustable support node and foundation pit multi-node support structure, solve the problem that the fixed angle foundation pit support node in prior art cannot adapt to special-shaped foundation pit, and then cause to increase construction difficulty, affect the problem of supporting effect;Wherein multi-head adjustable support node, comprising: fixed rod and more than one steering piece, steering piece includes first hinged component and second hinged component, one end of first hinged component is hinged with one end of second hinged component, and the other end of first hinged component is fixed with fixed part;More than one connecting rod, one end of connecting rod is fixed with the other end of second hinged component, fixed rod is fixed with a support rod, and is connected with other support rod by the other end of connecting rod, adjust steering piece, drive other support rod to rotate, to adapt to the supporting scene of multiple angles, increase support distance and operation space becomes larger, convenient for construction, and reduce support rod consumption, save supporting cost.

The application discloses a combined supporting device of anchor rod and section steel, which comprises a supporting section steel, a first arc-shaped plate, a second arc-shaped plate, a reinforcing anchor rod and a supporting anchor rod; the first arc-shaped plate is arranged directly above the second arc-shaped plate, the second arc-shaped plate is supported on the floor of a roadway through the supporting section steel, and a waist-shaped groove is formed on the second arc-shaped plate along the circumferential direction of the arc surface of the second arc-shaped plate; the upper end of the supporting anchor rod is fixed on the first arc-shaped plate, and the lower end of the supporting anchor rod slides in the waist-shaped groove along the circumference of the second arc-shaped plate; and the reinforcing anchor rod is arranged on the lower side of the first arc-shaped plate. The application further discloses a combined supporting system and a combined supporting method based on the combined supporting device of anchor rod and section steel. The combined supporting device of anchor rod and section steel has high shearing capacity and high bearing capacity, improves the roadway supporting strength, and improves the supporting capacity.

The invention discloses a TBM surrounding rock classification intelligent identification method based on a penetration index and Bayesian enhancement. The method comprises the steps that 1, surrounding rock classification is conducted; 2, constructing a primary surrounding rock classification model based on a penetration index; 3, constructing a primary surrounding rock classification model sample library; 4, training a primary surrounding rock classification model; 5, testing the primary surrounding rock classification model; step 6, calculating a prior probability; 7, calculating a conditional probability; 8, tunneling is conducted; step 9, calculating a penetration index of the tunneling section; step 10, primary prediction of tunneling section surrounding rock classification; and step 11, Bayesian posteriori estimation is carried out. According to the method, real-time calculation can be carried out according to field machine rock breaking tunneling monitoring data, the field geological exploration and indoor test cost can be effectively reduced, the intelligent prediction method based on Bayesian enhancement can obtain the posterior result of the tunnel face position based on prediction of the excavated section, and then the credibility of the prediction result is improved.

A preservation and observation device for tiny insect liquid immersion specimens relates to the technical field of insect research and comprises a specimen preservation bin and a sealing cover, the specimen preservation bin comprises a columnar preservation and observation bin and a columnar buffering bin, a bin opening of the preservation and observation bin is connected with the bin bottom of the buffering bin, and communication between the preservation and observation bin and the buffering bin is achieved. The cross section area of the storage and observation bin is smaller than that of the buffer bin, the storage and observation bin and the buffer bin are filled with storage liquid, and a sealing assembly used for blocking a bin opening of the storage and observation bin is arranged in the buffer bin. The technical problems that an existing preservation device is difficult to directly observe a specimen under a high-power microscope, and the observation precision is not high can be solved.

The invention belongs to the technical field of foundation pit engineering supporting, and particularly relates to a slant supporting pile supporting system convenient to mount and demount and a using method.The supporting system comprises a fender post, a top beam is arranged at the top end of the fender post, and the fender post is arranged in a foundation pit and close to the side wall of the foundation pit; the counter-force mechanism is arranged at the top of the side wall of the fender post and located on the side, close to the interior of the foundation pit, of the fender post; the hydraulic mechanism is detachably connected to the adjusting end of the counter-force mechanism; and the supporting mechanism is detachably connected to the telescopic end of the hydraulic mechanism, the supporting mechanism is obliquely arranged in the bottom of the foundation pit, and the supporting mechanism inclines towards the fender post. Rapid driving and installation of the inclined supporting pile system can be achieved without depending on a large machine, after the supporting system is installed, the axial force of the inclined supporting piles can be monitored in real time, and after foundation pit construction is completed, most components of the supporting system can be recycled and reused.

The invention discloses a fully-weathered siliceous rock tunnel large deformation comprehensive treatment system and a construction method. The construction method comprises the following construction steps that firstly, surrounding rock and a tunnel face are pretreated; secondly, the primary supporting arch frame and the inverted arch frame are installed; thirdly, temporary inverted arch support is conducted on an upper step and a middle step of tunnel excavation; and fourthly, the top reinforcing arch frame and the side reinforcing arch frames are installed and temporarily supported. According to the fully-weathered siliceous rock tunnel large deformation comprehensive treatment system, through the design of the special lock and the movable truss, the pressure of the arch frame is effectively released, breakage is avoided, the stability is enhanced, and the construction safety is improved; the risk of upheaval is reduced by the split inverted arch frame and the bottom anchor block; the adjustable sliding support trolley realizes rapid and accurate arch frame adjustment, and the efficiency is improved; the supporting system flexibly adapts to geological changes.

This invention discloses a numerical method for transparent characterization of stress fields in mining engineering, belonging to the field of numerical simulation. The method includes: constructing a standardized numerical computation environment and determining the target processing area; establishing a three-dimensional rock mass mesh model and performing mechanical equilibrium solutions, simultaneously acquiring stress component and elastic strain energy data to achieve stress-energy dual-dimensional characterization; based on preset target center coordinates, real-time analysis and direct storage of spatial distance and angle information of each mesh point; writing node coordinates, displacement, stress, energy, and element connection relationships into a unified ASCII universal format file to generate a cross-platform readable data file; and finally, data verification and output. This invention overcomes the limitations of traditional methods, such as single characterization dimension, reliance on third-party processing for spatial analysis, and difficulties in cross-platform data interaction, significantly improving the efficiency and accuracy of stability analysis in mining engineering.

The invention discloses a surrounding rock pre-grouting reinforcement method suitable for a fully mechanized face support removing channel, and belongs to the technical field of surrounding rock stability control. Grouting holes are formed in a working face through a working face haulage roadway and an air return roadway, and the grouting holes in each side are divided into shallow holes, medium-length holes and deep holes; superfine cement grout is injected into the working face through the shallow holes, the medium-deep holes and the deep holes, and full permeation of the coal and rock mass is achieved; the shallow holes, the deep holes and the medium-length holes are drilled in a crossed mode and grouted; after grouting is completed, a corresponding reinforcing structure is formed, and after the coal mining support reaches a mining stopping line and forms a support removing channel, the coal wall and the top plate are both pre-reinforced coal and rock masses; on the basis of pre-grouting reinforcement, proper anchor rods and anchor cables are arranged on the coal wall and the top plate of the support removing channel. According to the method, through advanced pre-grouting, the coal and rock mass in the frame removing channel area is reinforced in advance, the strength and bearing capacity of the coal and rock mass in the stopping line area are improved, and safety guarantee is provided for follow-up safe frame removing.

The invention belongs to the technical field of blasting engineering, and particularly discloses a novel non-coupling smooth blasting method. The blasting method comprises the steps that a row of peripheral holes are formed in the junction of a roadway driving working face and a surrounding rock retaining area, and slotting holes and auxiliary holes are formed in the inner sides of the peripheral holes; designing peripheral hole parameters and a charging structure; a blast hole arrangement diagram is drawn, and holes are distributed; according to the parameter design, peripheral holes, slotting holes and auxiliary hole cartridge bags are manufactured; according to the parameter design, the peripheral holes are filled with the explosive packages in an axial and radial non-coupling explosive loading mode, and the slotting holes and the auxiliary holes are filled with the explosive packages in an axial continuous explosive loading mode; a blasting network is connected and checked, then the slotting holes and the auxiliary holes are detonated firstly, and then the peripheral holes are detonated; a blasting vibration tester is arranged outside the blasting source, and the blasting vibration speed is collected to monitor the blasting vibration magnitude. The explosive loading amount of the peripheral holes and the peak pressure of detonation on the hole walls can be reduced, so that the smooth blasting effect is improved, and the blasting harm caused by blasting vibration is reduced.

The application belongs to the technical field of ship power systems, and particularly relates to a high-voltage alternating current charging range extender electric ship power system and a control method. The system comprises a lithium battery module, a direct current distribution module, an alternating current distribution module, a high-voltage alternating current charging module, a low-voltage shore power box, a propulsion module, a daily load and an EMS system. The application provides a high-voltage alternating current charging range extender electric ship power system and a control method, realizes multi-mode charging, reduces the cost of equipment and wharf construction, can adapt to high-voltage shore power and low-voltage shore power, has high system integration and efficient control.

The invention discloses a staged anchor cable forepoling method based on online monitoring. The staged anchor cable forepoling method comprises the following steps that P1, an underground forepoling monitoring scheme is formulated; p2, installing a forepoling effect monitoring system in the underground roadway; step P3, receiving a force signal and a displacement signal acquired by the underground advanced support effect monitoring system and performing signal analysis by the aboveground monitoring and analysis early warning system; and step P4, the monitoring and analysis early warning system automatically generates a report, if the report exceeds an early warning value, early warning information is issued, and a support designer is reminded to replace the support scheme. The mine production cost can be reduced, excessive investment of traditional one-time supporting is avoided through staged anchor cable advance supporting, accurate supporting is achieved according to requirements of different stages, waste of materials and equipment is reduced, and the supporting cost is reduced. Potential problems can be found and handled in time, maintenance and production halt loss caused by accidents are reduced, and the overall production cost of mining engineering is reduced from the long term.