107results about How to "Efficient construction" patented technology

The invention provides a state space model identification method and device, electronic equipment and a storage medium, and is applied to the technical field of computers, and the method comprises the steps: obtaining input time sequence data and output time sequence data of a target industrial system, generating a training data set based on the input time sequence data and the output time sequence data, and carrying out the recognition of a state space model; based on an initial state space model created by a neural network, initial parameters of the initial state space model are optimized by using a particle swarm optimization algorithm and based on the training data set to obtain target initial parameters, and then the target state space model is obtained based on the target initial parameters and the training data set. And performing network training on the initial state space model by taking minimization of the total loss function as a target to obtain a state space model used for representing the target industrial system, the state space model identification method provided by the invention can efficiently and reliably construct the state space model suitable for the complex industrial environment, and the identification accuracy of the state space model is improved. And a basis is provided for system analysis prediction and advanced control of an industrial system.

The invention discloses an intelligent self-adaptive scaffold system, relates to the technical field of building construction equipment, and solves the technical problems that a traditional scaffold is low in building efficiency, poor in adaptability to special-shaped buildings, lack of safety monitoring and high in material loss. The system comprises modular deformable scaffold units, an intelligent safety monitoring module, a quick splicing lock catch and a cloud management platform, miniature hydraulic rods and attitude sensors are arranged in the modularized deformable scaffold units, the attitude sensors are used for collecting form data of the external facade of a building, and the miniature hydraulic rods are driven to stretch out and draw back to achieve self-adaptive deformation of a main frame. The intelligent safety monitoring module collects load bearing, inclination, wind speed and personnel position data in real time, triggers sound-light early warning and synchronizes the sound-light early warning to the cloud and the worker intelligent bracelet. The rapid splicing lock catch realizes tool-free rapid disassembly and assembly; and the cloud management platform completes data integration, analysis, remote early warning and hydraulic rod expansion and contraction amount regulation and control. The construction supporting system is high in adaptability, efficient in building, safe and controllable, the modules can be recycled repeatedly, the construction cost and construction waste are reduced, and the construction supporting system is suitable for construction supporting of various constructional engineering.

The utility model provides a kind of well repair operation sucker rod lifting hook connecting device, it is related to oil and gas well auxiliary device technology.The well repair operation sucker rod lifting hook connecting device includes first connecting body, second connecting body, connecting part, the first connecting body is used to connect tubing elevator;The second connecting body is used to connect sucker rod lifting hook;The connecting part is located between the first connecting body and the second connecting body, and the first connecting body and the second connecting body are connected as a whole.The connecting device can quickly complete tubing and sucker rod tripping process conversion, with the characteristics of quick installation, safe and labor-saving, efficient construction.

This paper discloses a composite floor slab for prefabricated buildings, comprising several precast slabs, each with a lower protrusion at the left end and an upper protrusion at the right end, and waist-shaped recesses at the front and rear ends for engaging with fixing clips. The upper protrusion has an upper recessed hole and a right limiting hole, while the lower protrusion has a left limiting hole. When adjacent precast slabs are stacked, limiting posts pass through these holes sequentially for lateral fixation, and are connected longitudinally by fixing clips. The limiting posts have round heads and hexagonal bodies, adapted to the corresponding holes to prevent rotation. The surface of the precast slabs has fixing nail through-holes and fixing clips, filled with a grid-like steel reinforcement. The limiting posts and fixing clips are made of metal, and the contact surfaces of the upper and lower protrusions have anti-slip textures. This structure improves installation efficiency and connection strength, and is suitable for prefabricated buildings.

The invention discloses a method for rapidly and efficiently preparing a series of novel ester group facaplysin derivatives by combining EDCI and HOBT to react with carboxyl facaplysin and directly carrying out ester exchange reaction on an active ester intermediate and alcohol without separation. The invention also discloses application of the derivatives in resisting methicillin-resistant staphylococcus aureus and escherichia coli. The preparation method comprises the following steps that EDCI and HOBT are combined to activate carboxyl facaplysin for reaction, an activated ester intermediate is generated, the activated ester intermediate and alcohol are directly subjected to esterification reaction without separation, and a series of ester-based facaplysin derivatives are obtained. According to the preparation method, ester-based Fascaplysin derivatives with different structures can be rapidly and efficiently constructed, and compared with a traditional method that ester-based carboline derivatives are firstly synthesized and then high-temperature intramolecular cyclization is performed, the time and the raw material cost are greatly saved, the synthesis efficiency is improved, the reaction process is observable and controllable, and the yield is stable. And the synthesized ester group facaplysin derivative has excellent antibacterial activity on methicillin-resistant staphylococcus aureus and escherichia coli.

This application provides a method and apparatus for simulating the performance degradation of an integrated circuit power supply. The method includes: obtaining a spatial state equation for the output voltage of the integrated circuit power supply system based on an equivalent circuit model of the integrated circuit power supply; acquiring performance degradation models of multiple components with degradation characteristics in the integrated circuit power supply system, and importing the performance degradation models of the multiple components with degradation characteristics into the spatial state equation to obtain a spatial state model; using the spatial state model to obtain performance degradation array data of the integrated circuit power supply corresponding to each number of runs; and concatenating the performance degradation array data of the integrated circuit power supply corresponding to each number of runs to obtain performance degradation time sequence data of the integrated circuit power supply.

The application discloses a shear connector, a steel-concrete composite beam containing the shear connector and a construction method of the steel-concrete composite beam. The shear connector comprises an inverted truncated cone type cylinder (7), a stiffener, a cover plate, a penetrating steel bar (8) and a high-strength bolt (21); the stiffener comprises an integrally formed stiffener bottom plate (13) and a stiffener side plate (14), the size of the stiffener bottom plate is consistent with the size of the lower opening of the cylinder, and the stiffener bottom plate is attached to the lower opening of the cylinder; the stiffener bottom plate is provided with a second connecting hole for connecting the high-strength bolt; the stiffener side plate is arranged around the stiffener bottom plate and is attached to the inner wall of the cylinder; the height of the stiffener side plate is lower than that of the first connecting hole; the cover plate covers the upper opening of the cylinder; the penetrating steel bar transversely passes through the cylinder through the first connecting hole and leaves a connecting section on each side of the cylinder; and the high-strength bolt connects the stiffener bottom plate through the second connecting hole. The application realizes the disassembly and replacement of each component of the shear connector and the prefabricated bridge deck; and the structure form and stress performance of the shear connector are optimized.

This invention discloses a rapid construction method for large-section steel linings at multiple elevations in hydropower stations, belonging to the field of water conservancy and hydropower engineering construction technology. It aims to solve the problems of poor accessibility and high transportation risks on temporary roads leading to dams, and the limited lifting capacity of cable cranes due to civil engineering work, resulting in low installation efficiency and difficulty in ensuring the construction period. This invention manufactures individual sections of the steel lining downstream of the dam, assembles them, and then uses a gantry crane to hoist them onto a track-mounted electric flatcar, which is then horizontally transported to the dam base along a dedicated track. At the installation elevation, a modular cantilevered fixed gantry crane is assembled. This gantry crane has no trolley traveling mechanism; its legs directly rest on the dam body, allowing for rapid installation, disassembly, and reuse. The gantry crane vertically lifts the steel lining to the installation elevation, and then uses an omnidirectional hydraulic transfer trolley to precisely transport it to the work position, where the installation gantry crane completes the assembly. The gantry crane can be disassembled and transported to the next elevation for reuse. This invention eliminates reliance on temporary roads and cable cranes, features tight process connections, and uses versatile and reusable equipment, improving construction safety and efficiency, and is suitable for continuous construction at multiple elevations of dams.

The application discloses a kind of metalized carbon fiber heating wiring device, and application and wiring method, wiring device includes mounting disc and wire structure;Wire structure includes sleeve, support ring, two movable rings and two fixed rings;Support ring is sleeved in the middle of sleeve, two movable rings are symmetrically provided on the sleeve on the two sides of support ring, wire harness groove is respectively formed in the opposite side of the outer circumferential surface of two movable rings, two fixed rings are respectively sleeved in the two ends of sleeve, and elastic member is respectively arranged between two fixed rings and two movable rings, and the wire harness groove of two movable rings is adaptively clamped and guides the metalized carbon fiber wire harness passing through.The application has the advantages that the metalized carbon fiber wire harness can be adaptively clamped and guided, sliding friction is converted into rolling friction, wiring resistance is reduced, the insulation layer of metalized carbon fiber wire harness is protected, and the metalized carbon fiber wire harness after wiring is stable.

This invention belongs to the technical field of drug synthesis, specifically relating to memantine derivatives, their synthetic methods, and applications. The memantine derivatives include intermediate structural formulas I, II, and III, as well as a general structural formula. The linker is a substituted or unsubstituted C6-C10 aryl group, R1 is hydrogen or a C1-C6 alkyl group, and R2 is hydrogen, a C1-C6 alkyl group, or a nitrogen-containing or nitrogen-free structural fragment, or the overall structure of R1 and R2 is an N-substituted heterocyclopentyl or heterocyclohexyl group. The memantine derivatives provided by this invention improve drug activity by combining the memantine group with the OAB-14 partial structure, thereby altering the core structure. This invention also provides a synthetic method for the obtained compounds used in the treatment of Alzheimer's disease and Parkinson's disease.

The utility model discloses an anti-landslide road slope reinforcing device which comprises a plurality of splicing type prefabricated slope protection components arranged on a slope, a plurality of through holes are formed in the side edges of the prefabricated slope protection components, and the adjacent prefabricated slope protection components are connected together through connecting pieces penetrating into the through holes to form an integral slope protection structure. A first anti-slide pile is arranged at the top of the side slope, a base is fixedly connected to the toe of the side slope through a second anti-slide pile, the top of the integral slope protection structure is connected with the first anti-slide pile through an extension section of a connecting piece, and the bottom of the integral slope protection structure is connected with the base in a buckled mode. The structure is simple, construction is convenient and efficient, bearing capacity and long-term durability are good, construction quality is easy to control, and a good anti-sliding slope protection effect is achieved.

The invention relates to the technical field of waste battery recovery, and particularly discloses a direct regeneration method of a high-performance waste lithium iron phosphate battery material. The materials comprise waste lithium iron phosphate, lithium carbonate, soluble salt corresponding to magnesium or titanium, graphene, a glucose reducing agent, an adaptive organic solvent and the like; the method comprises the following steps: pretreating the waste battery, calcining to prepare an oxidation precursor, respectively preparing an ion dopant solution and a graphene dispersion liquid, sequentially mixing the raw materials, carrying out wet ball milling, drying and inert atmosphere preheating, and synchronously carrying out oxidation precursor reduction, ion doping and graphene compounding through high-temperature reduction. The regenerated lithium iron phosphate material can be used in the fields of electric vehicle power batteries, high-end energy storage systems and the like, and has the advantages of excellent electrochemical performance, structural stability and compaction performance; the method provided by the invention has the advantages of controllable operation, flexible raw material adaptation and high-valued recovery of waste materials, and can effectively improve the performance shortages existing in the traditional process.

The utility model relates to the technical field of trolley bases, and provides a shield tunnel prestress rail type reinforcing steel bar installation trolley base which comprises a steel top plate, vertical rods and a steel bracket, the bottom of the steel top plate is provided with a plurality of vertical rods, at least two horizontal rows and two longitudinal columns are arranged, and the lengths of the vertical rods in the same horizontal row are gradually increased to be matched with the radian of a tunnel. The bottom ends of the vertical rods are connected with the arc-shaped steel brackets to be attached to the bottom face of the tunnel, and a space for containing steel bars and steel strands is formed. A connecting hole is formed in the center of the steel top plate and connected with a cross arm bolt, and supporting and skid resistance between the two symmetrically-arranged bases are achieved. A positioning hole is formed in the center of the steel top plate and is in pressing connection with a trolley track through a pressing bolt for limiting and fixing. A positioning groove and a detachable welding positioning device are arranged at the bottom of the steel top plate, vertical rod welding positioning is rapidly completed through cooperation of a sliding positioning plate and the positioning groove, and dismounting and reuse are conducted after construction. Free movement of the trolley is achieved while steel bar installation precision is guaranteed, and the problems that a traditional base is hindered by steel bars, and rails are difficult to lay are solved.

This invention belongs to the field of photocatalyst materials technology, specifically relating to a three-dimensional graphene aerogel photo-self-propelled Fenton catalyst, its preparation method, and its application. The preparation method includes: mixing a graphene dispersion containing ethylenediamine with a phenolic resin prepolymer containing ferrocene, phenols, and an alkaline catalyst; followed by a one-step hydrothermal reaction, washing, and freeze-drying to obtain the three-dimensional graphene aerogel photo-self-propelled Fenton catalyst. This catalyst can be used to degrade organic pollutants in water under visible light irradiation.

The application relates to the field of electronic technology and discloses a sonar three-dimensional imaging reconstruction method, device and equipment for the underwater environment of an inspection well, which projects sonar ring scanning data corresponding to each depth to a target plane based on target posture data of each depth to obtain first sonar ring scanning data corresponding to each depth; calculates first centroid position coordinates corresponding to each depth based on the first sonar ring scanning data of each depth, and calculates second centroid position coordinates corresponding to each depth based on reference sonar ring scanning data; determines a translation vector corresponding to each depth based on the first centroid position coordinates and the second centroid position coordinates of each depth; corrects the first sonar ring scanning data by using the translation vector of each depth to obtain target sonar ring scanning data corresponding to each depth; and determines an underwater three-dimensional model of the inspection well based on the target sonar ring scanning data of each depth, pixel quantity information, pixel spacing information and target posture data, so that the complex geometric shape of the whole inside of the inspection well can be restored completely and with high precision.

This utility model relates to the field of cast-in-place pile construction technology, specifically to a suspended mud pump, including a mud pump body, a support assembly, and a floating assembly. The support assembly has a centrally located space for mounting the mud pump body, which is situated within this space. The floating assembly is positioned around the support assembly and includes at least two suspension units. These suspension units provide buoyancy to support the mud pump body. The mud pump body reciprocates based on these suspension units, following changes in the mud slurry level. The mud pump body has a suction port located at its lower part, flush with the bottom of the floating assembly. This design prevents the water level from exceeding the motor's height or causing idling, extending equipment lifespan. Furthermore, by maintaining a reasonable relative depth between the suction port and the liquid surface, fluctuations in suction resistance are reduced, ensuring stable mud circulation flow.

The invention discloses a multi-modal federal cross-domain fault diagnosis method and application based on prototype comparative learning, and the method comprises the steps: each source client receives an initialized global model and a prototype, and carries out the local model training through the local data; in the training process, a source client side mines potential essential association in multi-source heterogeneous data through double-layer prototype comparison, the barrier of modal isomerism is effectively broken through, and alignment of multi-modal fault features is achieved. Then, local model optimization is carried out by minimizing total comparison loss and classification loss, and a local prototype and a local modal prototype are generated; and the central server aggregates the local prototype and the local modal prototype to generate a global prototype and a global modal prototype of the comprehensive fault information, and aggregates the local model to construct a global model with good generalization ability. According to the method, modal isomerism and data distribution difference existing in multi-modal federated learning are solved, and the accuracy and generalization of global model cross-domain fault diagnosis are effectively improved.

The invention belongs to the technical field of constructional engineering, and particularly relates to a Revit-based fabricated component family library construction and use method, which comprises the following steps: dividing a component family library into twelve system categories of three major majors of building, structure and electromechanical, standardizing naming and coding principles of corresponding component families, and gathering the component families in a table form; parameter elements and parameter categories of the component families are specified, the same parameters of the same component families are controlled by'type parameters', individual differences of the component families are controlled by'instance parameters', and the component families of different system categories are associated with one another by'global parameters', so that linkage between models is constructed; and performing encryption processing on the component family storage to protect the intangible digital assets. According to the invention, informatization, standardization and systematization management of components and parts are realized, the whole industry chain service of the building is supported, basic support is provided for application of the BIM model, and the current situation barrier of the industry is broken.

The invention discloses a method for synthesizing chiral morpholine from propargyl alcohol ester. Chiral morpholine is an important drug molecular skeleton and is widely applied to the aspects of analgesia, anesthesia, tumor resistance, heart treatment and the like as a drug active ingredient, but an efficient synthesis method is lacked. According to the method disclosed by the invention, under the regulation and control of arylboronic acid and a specific chiral ligand, propargyl alcohol ester and an affinity reagent react to obtain optically pure (87-97% ee) morpholine. The method has the characteristics that the catalyst and the ligand are wide in source, and the substrate is cheap and easy to obtain; the chiral morpholine has excellent enantioselectivity and good functional group compatibility, can be suitable for structural modification of bioactive molecules and intermediates, and is a simple and efficient asymmetric catalysis strategy for synthesizing chiral morpholine.

The application discloses a kind of based on hovering underwater vehicle's underwater unknown environment active mapping method, belong to robot environment exploration technical field.The underwater unknown environment active mapping method based on hovering underwater vehicle provided by the application utilizes hovering underwater vehicle to obtain the environmental data of unknown area of ocean in cooperation with sensor, determines the best next viewpoint according to information gain value, and determines the safe and feasible path to the best next viewpoint according to the cost of each adjacent node on the current tree as the parent node when the best next viewpoint is reached.Updating grid map in real time in this way, efficiently, quickly and accurately realize the construction and dynamic updating of map, and then assist underwater vehicle to realize the navigation of target area, and has broad application prospect in underwater environment exploration task and underwater structure inspection based on underwater vehicle and similar tasks.

The utility model provides a hoop of a climbing device. The hoop of the climbing device comprises a three-section integrated hoop, an opening and closing oil cylinder and a locking device, the three-petal integrated hoop is mainly composed of a module A, a module B and a module C. The module B and the module C are hinged to the module A respectively. The cylinder body end of the opening and closing oil cylinder is hinged to the module A, the telescopic end of the opening and closing oil cylinder is hinged to the module B and the module C, and the opening and closing oil cylinder is used for driving the module B and the module C to rotate around the hinge point so as to achieve opening or closing of the three-petal integrated hoop. And the locking device is used for carrying out secondary locking on the module B and the module C. The three-section integrated design is adopted, disassembly is not needed, the whole body is close to a pier column, opening and closing are automatically controlled by the opening and closing oil cylinder to surround the pier column or be separated from the pier column, assembly and disassembly are convenient, safe and efficient construction of a capping beam can be achieved, and meanwhile the device has the advantages of being high in automation degree, simple in structure and the like.

The utility model provides a steel structure truss, which relates to the field of steel structures, and comprises a steel stand column, first preset screw holes are uniformly formed in two rows in the middle area of the steel stand column; the first rigid beam is horizontally arranged on one side of the steel stand column; the second rigid beam and the first rigid beam are arranged on the other side of the steel stand column in parallel; the stabilizing end plates are connected to the contact ends of the first rigid beam and the steel stand column and the contact ends of the second rigid beam and the steel stand column correspondingly, and second preset screw holes are evenly formed in the two rows of the middle areas of the stabilizing end plates; and the stabilizing screw rod penetrates through the first preset screw hole and the second preset screw hole. Through the connecting mode that the stabilizing screw penetrates through the steel stand column and the stabilizing end plate and corresponds to the first preset screw hole and the second preset screw hole, under the complex and changeable load effect, the eccentric stress condition can be effectively avoided, stability is provided for the connecting joint, and meanwhile the stability of the connecting joint is improved. The risk that the structure deforms or is damaged due to unstable connection is greatly reduced, and a solid guarantee is provided for safe operation of the whole steel structure truss.

The present invention relates to a method for modifying the wettability of a carbon allotrope, comprising the steps of: preparing a carbon allotrope; a step for preparing a solvent capable of inducing the generation of hydrophilic radicals or hydrophobic radicals; a step for bringing the carbon allotrope into contact with the solvent; a step of supplying energy to the solvent using an energy supply source; and a step of generating a hydrophilic radical or a hydrophobic radical of the solvent by the energy supplied to the solvent, the generated radical being bonded to the end of the carbon allotrope.

The invention provides a nuclear power plant isolation information management method, electronic equipment and a storage medium. The method comprises the following steps: initializing an isolation information source of a nuclear power plant to form a first sequence; configuring a target isolation ticket rack name, and constructing a first Hash map according to a mapping relation between the target isolation ticket rack name and the first sequence; forming a second sequence according to all isolation information which is from an isolation information source and is matched with a target isolation ticket rack name, and extracting all system names which are not repeated in the second sequence through field classification statistics to form a system name list; associating the second sequence as a child node to the first hash map; and determining a target system name from the system name list, and constructing a second hash map according to a mapping relationship between the target system name and the second sequence. According to the method and the device, the isolated ticket rack relationship can be constructed and displayed in a more efficient and more intuitive manner, so that the operation efficiency and accuracy of related businesses such as operation management and isolated management are improved.

The utility model relates to the technical field of row structure, concretely is a kind of new prefabricated whole-pouring multistory row structure, including first fixed frame, first mounting hole and connecting rod.The new prefabricated whole-pouring multistory row structure, first fixed frame and second fixed frame are as basic load-bearing unit, and transverse stable connection is realized by connecting rod: the both ends of connecting rod are respectively with the first mounting hole of first fixed frame, the second mounting hole of second fixed frame thread connection, form independent row unit.Meanwhile, the first protruding block of first fixed frame is matched with the first clamping slot of adjacent first fixed frame, the second protruding block of second fixed frame is matched with the second clamping slot of adjacent second fixed frame, after splicing, it is fastened by bolt with the fixed screw hole of clamping slot top and bottom, ensure that node is not loose when transverse expansion, realize the uniform dispersion of load, both ensure the integrity and stability of overall structure, and also realize efficient construction and flexible expansion by the standardization interface of prefabricated component.

The utility model provides an auxiliary flue mounting device which comprises a hoisting part and a fixable support, the hoisting part comprises a pulley assembly and a lifting rope, and the lifting rope is movably connected with the support through the pulley assembly. The support can be installed above the floor slab, the floor slab is provided with the reserved hole, the lifting rope can penetrate through the reserved hole and is connected with the flue arranged below the floor slab, and the flue can be driven to move and aligned to the reserved hole by lifting the lifting rope. The device has the advantages that construction can be efficiently carried out, manpower is saved, the situation that the installation quality is affected due to poor positioning in the flue installation process is reduced, flue damage caused by repeated prying of the flue in the adjusting process is avoided, the hidden danger that the flue leaks smoke in the later period is reduced, the device is convenient to install and low in machining cost, and the installation efficiency and quality can be improved; installation manpower and construction cost are saved, and the device can be detached and reused.

The application discloses a test method for an indirect jump table solving process of a binary disassembler, uses SCsmith to automatically and efficiently construct a large C file data set which can generate a jump table, further constructs a binary test set under different optimization levels through an Oracle GT compiler to track a compiling process, compares a result of solving the indirect jump table by the disassembler with a correct result, evaluates a performance of an indirect jump table solving algorithm of the disassembler, and points out a position of error occurrence. Meanwhile, since a test case corresponds to the indirect jump, the position of error occurrence can be easily pointed out. The test set constructed by the application has more effective jump tables and greater density, and can be automatically constructed, so that the test efficiency is greatly improved. The application can be used for performance evaluation of the disassembler, can help the disassembler to find defects and improve performance, and has wide application prospects.

The invention relates to the technical field of germplasm screening, and discloses a melon low-temperature-resistant germplasm screening method and system, and the method comprises the steps: carrying out the abnormal value correction of time sequence phenotypic data, and obtaining standard phenotypic data; extracting low-temperature stress response data of the standard phenotype data to obtain key physiological features, and performing curve fitting on timestamps of the key physiological features to obtain a time sequence change curve of the key physiological features; performing nonlinear time-varying analysis on the key physiological features and the time sequence change curve to obtain a digital low-temperature response spectrum; based on historical response spectrum data, performing adaptive spectrum enhancement on the digital low-temperature response spectrum to obtain an optimized low-temperature response spectrum; carrying out dimension reduction treatment on the optimized low-temperature response spectrum to obtain a low-temperature-resistant principal component, and determining a comprehensive low-temperature-resistant index according to the low-temperature-resistant principal component; grading the muskmelons to be screened based on the comprehensive low temperature resistance index to generate a germplasm screening report; the low-temperature-resistant germplasm screening efficiency of the muskmelon can be improved.

This invention relates to the field of coal mining technology and discloses a method for controlling the subsidence of hydraulic supports in working faces with soft collapse columns. The method includes: determining the subsidence range of the floor subsidence area in the direction of face advancement; selecting a load-bearing component based on this size: when the size is less than a preset threshold, a rigid crossbeam is selected and laid using the cutting space between the scraper conveyor and the coal face; when the size is greater than or equal to the preset threshold, a flexible chain assembly is selected, inserted and laid from below the support's pushing jack, tightened, and limited by stops. The load-bearing component crosses the subsidence area along the advancement direction, with both ends supported on the hard floor plates on both sides. After the hydraulic support moves forward and is supported on the load-bearing component, the load is transferred to the hard floor plate using the bending resistance of the rigid crossbeam or the tensioning and suspension effect of the flexible chain, effectively preventing the support from sinking in the soft collapse column area and ensuring the safe advancement of the fully mechanized mining face.

The invention provides microporous low-shrinkage concrete and a preparation method thereof, and belongs to the field of concrete.The microporous low-shrinkage concrete is prepared from, by weight, 300-380 parts of cement, 30-70 parts of fly ash, 250-350 parts of medium sand, 1200-1550 parts of guar stone, 5-10 parts of silica fume, 2-4 parts of dihydrate gypsum, 0.5-2 parts of water glass, 2-5 parts of a water reducing agent, 0.1-0.3 part of a retarder, 4-8 parts of rubber powder, 0.02-0.08 part of a thickening agent and 2-6 parts of water absorption fibers. 110 to 150 parts of water; and the porosity of the microporous low-shrinkage concrete is 8-10%. Through innovative material design and a synergistic effect, comprehensive improvement of waterproofness, crack resistance, construction performance and economical efficiency is achieved, seepage water can be changed from blocking to dredging through a unique micropore structure, and the efficient and durable anti-seepage effect is achieved; meanwhile, the stability of a base layer is guaranteed through high strength, strong bonding force is formed with a surface layer, and hollowing and cracking are effectively eradicated; in addition, the water-absorbing fiber internal curing component and the expansion component cooperate, so that the cracking risk is avoided, and the long-term stability and safety of the floor system are guaranteed.