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923 results about "Mass concrete" patented technology

Mass concrete is defined by American Concrete Institute Committee 207 as "any volume of concrete with dimensions large enough to require that measures be taken to cope with the generation of heat from hydration of cement and attendant volume change to minimize cracking."

Mass concrete temperature evolution analysis model based on multi-field coupling model

The invention discloses a mass concrete temperature evolution analysis model based on a multi-field coupling model. The mass concrete temperature evolution analysis model comprises the following steps: S1, establishing a concrete hydration field model containing temperature and relative humidity correction; s2, establishing a temperature field model containing common characterization of concrete matching, hydration degree and relative humidity; s3, establishing a humidity field model for correcting an early concrete water storage function and a humidity transmission coefficient based on the hydration degree; s4, establishing a water cooling model coupled with the concrete temperature field based on the non-isothermal pipeline flow; and S5, establishing an early concrete temperature rise analysis model based on hydration-heat-wet-water cooling coupling based on a finite element method. According to the method, environmental factors, material factors, construction factors and maintenance factors in the concrete hydration process are fully combined, the application scene is more comprehensive, and the accuracy is higher.
Owner:CHINA MCC5 GROUP CORP LTD

Mass concrete intelligent temperature control system based on neural network and PID control

The invention belongs to the technical field of concrete temperature regulation and control, and particularly relates to a mass concrete intelligent temperature control system based on a neural network and PID control, and the system comprises a temperature obtaining module which is used for obtaining temperature data in mass concrete; the data processing module is used for processing the temperature data; the temperature prediction module is used for predicting the temperature change trend of the mass concrete; the PID control module is used for calculating the temperature deviation between the real-time temperature data and the target temperature data according to the real-time temperature data and generating a cooling control signal through a PID algorithm; the PID control module is further used for judging whether the current PID control parameter meets a preset requirement or not according to the temperature change trend predicted by the temperature prediction module, and automatically adjusting the PID control parameter when the judgment result is that the current PID control parameter does not meet the preset requirement; and the cooling execution module is used for adjusting the cooling system to work according to the cooling control signal. According to the invention, the temperature of the large-volume concrete can be effectively controlled in the pouring process.
Owner:ZHONG JIAO SAN GONG JU DI LIU GONG CHENG (HE BEI) YOU XIAN GONG SI

Method and system for monitoring and dynamically regulating and controlling hydration heat in mass concrete pouring process

The invention discloses a hydration heat monitoring and dynamic regulation and control method and system in a mass concrete pouring process, and relates to the technical field of concrete pouring, and the method comprises the steps: pre-burying a plurality of dual-mode temperature measurement probes in concrete, collecting dual-mode temperature field data in the concrete in real time, and synchronously collecting environmental parameters; carrying out preprocessing, dynamic weight distribution and data fusion on the obtained dual-mode temperature field data; according to the unsteady state heat transfer equation and the hydration heat model, a finite element heat conduction model is constructed, and the total hydration heat and the temperature difference trend are inverted through actually measured temperature field data; predicting a concrete core and surface temperature difference and a surface and environment temperature difference in a future set time period by combining an LSTM neural network model; and according to the predicted temperature difference result, the cooling water flow rate and the cooling water temperature are subjected to closed-loop regulation. Through the combination of dual-mode sensor temperature measurement and heat inversion, the hydration heat temperature difference in the concrete can be predicted in advance, a cooling scheme is regulated and controlled in real time in a linkage mode, and temperature stress cracks are avoided.
Owner:SINOHYDRO BUREAU 14 CO LTD +1

Mass concrete intelligent temperature control system

The invention discloses a mass concrete intelligent temperature control system, and relates to the technical field of concrete temperature control, the system comprises a sensor monitoring module, a data collector, a data transmission module, a central control module, an execution mechanism and a data recording and remote monitoring module; by integrating the sensor monitoring module, the data collector, the data transmission module and the central control module, real-time monitoring and accurate analysis of key parameters in the concrete and in the construction environment are achieved, and a temperature and humidity prediction unit in the central control module can predict the temperature and humidity of the concrete by means of a finite element analysis method and a CFMH dynamic prediction formula. According to the method, the temperature and humidity trends of the concrete in different time and areas can be accurately predicted, the concrete quality problem caused by temperature and humidity fluctuation is greatly reduced, the quality stability of concrete construction is improved, a scientific and reliable decision basis is provided for constructors, the construction process is optimized, and the construction cost is reduced.
Owner:HENAN PROVINCIAL WATER CONSERVANCY SECOND ENG BUREAU GRP CO LTD

Mass concrete curing method based on intelligent temperature control system

The mass concrete curing method based on the intelligent temperature control system comprises the following steps that concrete is divided into a top layer, a bottom layer and a middle layer, each layer is provided with an independent temperature control pipeline, and temperature monitoring points are designed; constructing a three-dimensional thermal field finite element model containing a hydration heat release function, temperature control pipeline heat sink and boundary conditions, and generating data by using a calculation result of the finite element model to train a neural network prediction model; a temperature control pipeline and a temperature monitoring point are installed before mass concrete is poured, and heat preservation is covered after pouring; data is collected in real time and input into the prediction model, the predicted temperature of each temperature monitoring point is output, if the temperature difference control threshold value or the temperature reduction control threshold value is exceeded, temperature control pipeline parameters and heat preservation measures of the corresponding layer are adjusted, and a temperature control strategy is executed after calculation is repeated till the requirement is met. The concrete temperature field is accurately controlled, temperature difference over-limit is effectively avoided, and the mass concrete curing quality is improved.
Owner:CHINA ROAD & BRIDGE

Method and system for controlling cooling water temperature of large-volume concrete filled with water

The invention relates to the technical field of temperature control, in particular to a mass concrete water cooling water temperature control method and system. The method comprises the following steps: collecting concrete key parameters through a multi-source sensor, constructing a microenvironment model based on information geometry, and generating a thermosensitive characteristic spectrum; forming a distributed thermodynamic model by utilizing a mutual information routing algorithm and heat-fluid-solid coupling analysis, and calculating an optimal cooling strategy; water flow path and flow optimization is realized in combination with fractional order particle swarm optimization; a pump set and a valve are adjusted through fuzzy self-adaptive control; and a potential instability region is identified through the spectrum energy gradient, and risk early warning is triggered. The precision and reliability of mass concrete cooling temperature control are remarkably improved, and intelligent, efficient and safe temperature control adjustment in the whole process is achieved.
Owner:CCCC FOURTH HARBOR ENG CO LTD +1

Mass concrete raft foundation three-dimensional temperature field reconstruction method

The invention relates to a mass concrete raft foundation three-dimensional temperature field reconstruction method, and relates to the technical field of concrete raft foundation structure three-dimensional temperature field reconstruction. The method comprises the following steps: arranging temperature sensing optical fibers in a plurality of temperature measurement areas of a concrete raft foundation to be measured; constructing an optical fiber temperature measurement monitoring system, and obtaining space-time temperature data; a temperature field prediction model is constructed, the temperature field prediction model is based on a physical information neural network, and a data loss function, a physical loss function and an initial condition loss function are fused; performing multi-objective loss function joint optimization training on the temperature field prediction model based on the space-time temperature data; utilizing the trained temperature field prediction model to predict the temperature value of the concrete raft foundation to be measured at any time and space point coordinates; and reconstructing a three-dimensional temperature field based on a prediction result output by the temperature field prediction model. By adopting the method, high-precision reconstruction of the three-dimensional temperature field of the mass concrete raft foundation can be realized.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Concentric circle filling device and application method in mass concrete crack control

The invention provides a concentric circle filling device and an application method in mass concrete crack control, and belongs to the technical field of hydraulic structures. The concentric circle filling device comprises a pipe body structure, the pipe body structure comprises an outer pipe body and an inner pipe body, the outer pipe body and the inner pipe body are coaxially arranged in a sleeved mode, and an annular area between the outer wall of the inner pipe body and the inner wall of the outer pipe body serves as a first storage space; an inner cavity of the inner tube body serves as a second storage space; the inner tube body is sleeved with an inflatable annular air bag, and when the annular air bag is not inflated, the annular air bag can slide up and down along the inner tube body; after the annular air bag is inflated, one end of the first storage space can be completely sealed and plugged; an air bag ball is arranged in the inner tube body, and after the air bag ball is inflated, one end of the second storage space can be completely sealed and plugged. The method is implemented based on the concentric circle filling device and is applied to mass concrete crack control. Cracks generated by the gate pier can be effectively controlled, and meanwhile the integrity of the structure is improved.
Owner:SHANDONG JIAOTONG UNIV +1

Mass concrete structure temperature stress cracking prevention and control method

The invention discloses a method for preventing and controlling temperature stress cracking of a mass concrete structure. The method comprises the following steps: preparing low-heat high-toughness concrete; low-heat high-toughness concrete is adopted for pouring a mass concrete structure, and simulation calculation is conducted on a transient temperature field and time-varying temperature stress in the mass concrete construction process; and according to a simulation calculation result, in order to avoid temperature stress cracking in the mass concrete structure, the concrete mold entering temperature, the pouring procedure and the construction maintenance are adjusted in good time. The method can be used for preparing the material capable of reducing the adiabatic temperature rise peak value of the mass concrete and improving the tensile strength of the concrete, reasonably determining the pouring construction maintenance system of the mass concrete, and preventing the mass concrete structure from cracking due to the fact that the temperature stress exceeds the allowable tensile strength of the concrete in the construction process.
Owner:CHONGQING JIAOTONG UNIV

Anti-crack construction method for radiation-proof mass concrete

The invention relates to an anti-crack construction method for anti-radiation mass concrete. The anti-crack construction method comprises the following steps: 1) designing a computer tall formwork system and performing computer simulation construction; (2) optimally designing a concrete mix proportion; (3) a wall body cooling water circulating pipe and a temperature detector are installed; (4) mass concrete pouring process quality control; 5) starting a water cooling system; and (6) concrete curing. According to the method, safety calculation software is used for carrying out safety load simulation calculation, BIM simulation construction, test optimal mix proportion, raw material management and control and electronic temperature monitoring, and analysis is carried out according to the real-time temperature monitoring condition; the cooling pipe circulating water is used for reducing internal hydration heat, the geotechnical cloth and the film cover are used for heat preservation, moisture preservation and maintenance, all-around and whole-process quality control measures are taken, and it can be ensured that the mass concrete does not have the quality problems of cracking, leakage and the like which affect the radiation protection performance.
Owner:HUNAN NO 6 ENG CO LTD

Mass concrete composite anti-crack structure and crack control construction method based on mass concrete composite anti-crack structure

The invention discloses a mass concrete composite anti-crack structure and a crack control construction method based on the mass concrete composite anti-crack structure. The composite anti-crack structure comprises a core common concrete layer, an outer side anti-crack concrete layer, a reinforcing mesh arranged between the core common concrete layer and the outer side anti-crack concrete layer, and a top anti-crack concrete layer. The method comprises the steps that firstly, the thickness of side face anti-crack concrete and the thickness of top face anti-crack concrete needing to be poured are calculated according to cracking risk assessment, the side face anti-crack concrete is poured firstly, then core common concrete is poured, and it is ensured that the pouring height of the side face concrete is always 20-30 cm higher than the core common concrete; and then the top surface is completely constructed by adopting anti-crack concrete. The reinforcing mesh subjected to special treatment is adopted, so that the overall stress of the composite structure is uniform, the overall anti-cracking performance and durability of the composite structure are improved through the outer side anti-cracking concrete, the construction technology is simple, meanwhile, a large amount of construction cost and operation and maintenance cost can be saved, and the composite structure is suitable for application and popularization.
Owner:JIANGSU SOBUTE NEW MATERIALS CO LTD +2

Concrete regulation and control system and method integrating heat recovery, spraying and gradient control

The invention provides a concrete regulation and control system and method integrating heat recovery, spraying and gradient control, and relates to the technical field of concrete curing, and the concrete regulation and control system comprises a temperature sensing element and a humidity sensing element which are mounted on reinforcing steel bars in a concrete structure in a layered manner in the depth direction; the cooling water circulating system comprises a water pump and a cooling water pipe, and the cooling water pipe is arranged in the mass concrete structure and externally connected with a variable frequency circulating pump; the double-water-tank system is matched with the heater to realize graded regulation of water temperature; the automatic spraying system is connected with the integrated electric heating module; the heat recovery and circulation assembly is connected with an outlet of a cooling water pipe in the concrete, recovers concrete hydration heat brought out by the cooling water pipe, and transfers heat of high-temperature cooling water with the temperature being 50 DEG C or above to the phase change heat storage tank; the central control unit continuously receives and records monitoring data of the temperature sensor and the humidity sensor and analyzes the monitoring data in real time, and when the temperature gradient or the humidity gradient exceeds the limit, a gradient field control instruction is automatically triggered to achieve energy efficiency maximization.
Owner:SHANGHAI NANHUI BUILDING ENG LTD +1

Cooling water pipe for gravity dam construction based on destroying laminar sublayer and method thereof

The present application belongs to the technical field of mass concrete construction, and aims to solve the problem of high thermal resistance and slow heat dissipation of traditional cooling pipe laminar bottom layer, and discloses a gravity dam construction cooling water pipe based on destruction of laminar bottom layer and a method thereof. The cooling water pipe comprises a plurality of series water pipe units, each water pipe unit comprises a steel pipe, a flexible spring hose is arranged in the steel pipe, and the spring hose forms a spiral protruding turbulence structure along the inner wall of the steel pipe; the hose is fixed by pointwise anchoring and outer wall surface bonding with glue, and a ring is arranged at both ends for limiting and assisting turbulence. The present application breaks through the thermal resistance of laminar bottom layer, greatly improves the hydration heat conduction efficiency, is convenient to construct and has durable structure, and is suitable for mass concrete temperature control requirements.
Owner:SHANDONG PROVINCE WATER CONSERVANCY BUREAU CO LTD

Mass concrete hydration heat internal and external temperature difference and temperature strain prediction method

The invention relates to a mass concrete hydration heat internal and external temperature difference and temperature strain prediction method, which is based on a hydration reaction of a concrete cementing material, through observation records of parameters such as concrete mold entering temperature, environment temperature and center temperature, a function relationship between the parameters and a pouring area temperature is established, and through a function model, an overall temperature field is predicted. Forming an internal and external temperature difference prediction model, and outputting an internal and external temperature difference; and in combination with concrete strain records, establishing a relation function of temperature and strain, forming a concrete hydration heat temperature-strain prediction model, and outputting a strain prediction result. The problem of hydration heat of mass concrete pouring construction puzzling major engineering can be solved. The problems of internal damage and surface cracking of the concrete due to overlarge internal and external temperature difference and temperature strain exceeding the initial tensile strain of the concrete caused by low concrete strength, poor bonding force of gravel aggregate, centralized hydration of a large amount of cement, and easy generation of adiabatic temperature rise in the initial stage of pouring are solved.
Owner:SHENYANG UNIVERSITY OF TECHNOLOGY +1

Anti-crack mass concrete and preparation method thereof

The invention relates to the technical field of building materials, in particular to anti-crack mass concrete and a preparation method thereof, and the concrete is prepared from a gelling system, composite aggregate, a gradient functional additive and water according to a specific ratio. The preparation method is achieved through premixing, gradient stirring and gradient temperature control curing, the three-stage expansion effect of the compound expanding agent is utilized to be matched with the concrete shrinkage process, the hydration heat inhibitor is combined for reducing the temperature peak, basalt fiber is used for reinforcing, and the cracking risk is quantitatively evaluated, so that the 28-day restrained expansion rate of the concrete reaches 0.012% or above, the cracking risk coefficient is smaller than or equal to 0.7, and the concrete has the good crack resistance. The hydration heat peak value is reduced to 48 DEG C or below, and the cement is suitable for engineering of ultra-long structures, large-volume side walls and the like, has no harmful cracks within one year or above, has crack resistance and mechanical properties, and is wide in application prospect.
Owner:SICHUAN JINGYIDA ENG INSPECTION CO LTD

Large-volume concrete wireless temperature measurement system

The invention belongs to the technical field of concrete wireless temperature measurement, and provides a mass concrete wireless temperature measurement system, which comprises a temperature monitoring module, an alarm judgment module, a data analysis module and a record storage module, the method comprises the following steps: acquiring temperature detection data of mass concrete in real time through a plurality of temperature sensors uniformly embedded in the mass concrete and a wireless transmission chip, and analyzing the temperature detection data in combination with system time to obtain a temperature change abnormal value; judging whether the overall temperature change of the mass concrete at the moment is abnormal or not according to the temperature change abnormal value, obtaining temperature data in the detection period, analyzing the temperature data to obtain the temperature abnormal value of the detection point in the detection period, and obtaining the temperature of the mass concrete through data analysis based on the temperature abnormal value of the detection point. The temperature recording report is generated for the mass concrete and stored, overall temperature detection and analysis of the mass concrete are facilitated, constructors can better master the performance state of the concrete, and the quality of the concrete is ensured.
Owner:国网山西省电力有限公司建设分公司

Method, system and equipment for adjusting temperature of mass concrete and storage medium

The invention relates to the technical field of concrete engineering, in particular to a mass concrete temperature adjusting method, system and device and a storage medium, the method is applied to an intelligent controller, and the method comprises the steps that the internal and external temperature difference between the top of mass concrete and the interior of the mass concrete, and the water temperature of a water inlet and the water temperature of a water pump water flow hose are obtained; according to the internal and external temperature difference, the water outlet water temperature, the water inlet water temperature and the actual flow speed fed back by the flow speed sensor, obtaining the water pump rotating speed; determining target water temperature according to the water pump rotating speed; according to the water temperature of the water inlet and the target water temperature, the cooling water temperature assembly is controlled, and the mass concrete temperature is adjusted. According to the method, the effective cooling effect of the mass concrete is achieved, energy conservation and emission reduction are achieved, potential hazards existing in the mass concrete are eliminated, and the engineering quality is ensured.
Owner:CHINA CONSTR SCI & IND CORP LTD

Temperature control method for mass concrete structure

The invention provides a temperature control method for a mass concrete structure, and relates to the technical field of concrete pouring construction, and the method comprises the following steps: carrying out the regional division of the mass concrete structure, and obtaining a first data set and a second data set of each to-be-detected region in real time; the first data set comprises the concrete temperature and the concrete temperature change rate of the mass concrete structure, and the second data set comprises the cooling water temperature and the cooling water flow of the cooling water; based on the first data set and the second data set, a structural performance parameter set of the mass concrete structure at the moment is obtained, and the structural performance parameter set comprises structural stress, strain, a safety index and a stability index; and according to the structural performance parameter set, generating corresponding cooling water target temperature, cooling water target flow and target cooling duration for adjusting the circulation process of the cooling water so as to control the temperature of the mass concrete structure. According to the scheme, the temperature control accuracy in the mass concrete cooling process is guaranteed, and the situation of concrete cracking is reduced.
Owner:BUILDING & MOUNTING ENG CO LTD NO 12 BUREAU MINIST OF RAILWAYS +2

Large-span stiff skeleton arch bridge skewback foundation mass concrete crack control method

The invention discloses a large-span stiff skeleton arch bridge skewback foundation mass concrete crack control method, and relates to the technical field of bridge engineering, and the system comprises the following components: S1, building a collaborative analysis model, S2, analyzing deformation influence, and S3, implementing crack control measures. The method has high pertinence and practicability by adjusting the concrete mix proportion, adding the admixture, setting temperature control measures and optimizing the reinforcement design, the concrete mix proportion and the cement dosage can be adjusted in a targeted mode through the concrete stress distribution condition and the stiff skeleton deformation condition obtained through the collaborative analysis model, and the construction efficiency is improved. The additive is added to reduce the adverse effect of hydration heat, meanwhile, effective temperature control measures are set according to the temperature field distribution condition, in addition, by optimizing the reinforcement design, the bearing capacity and crack resistance of the skewback foundation can be further improved, the crack risk of large-size concrete of the skewback foundation of the large-span stiff skeleton arch bridge is effectively reduced, and the service life of the large-span stiff skeleton arch bridge is prolonged. And the overall quality and safety of a project are improved.
Owner:CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP CO LTD +3

Multi-parameter fusion early warning system for mass concrete water storage and maintenance process

The invention relates to the technical field of building engineering construction monitoring, and particularly discloses a mass concrete water storage and maintenance process multi-parameter fusion early warning system which comprises a multi-source heterogeneous sensing network, an edge computing gateway, a cloud fusion analysis platform and an early warning execution terminal. The sensing network collects multi-dimensional parameters such as temperature, humidity and stress of concrete and the environment; the cloud platform evaluates the maintenance state and generates a graded early warning instruction based on a multi-physics field coupling model and a fusion early warning algorithm; and the early warning terminal drives the field device to execute differential intervention. According to the invention, comprehensive perception, accurate evaluation and active regulation and control of the states of multiple physical fields in the maintenance process are realized, and the early warning reliability and the maintenance quality are improved.
Owner:福建新华夏建工集团有限公司

Construction method for cooling and controlling temperature of large-volume radiation-proof concrete

The invention provides a cooling and temperature control construction method for large-volume radiation-proof concrete, and relates to the technical field of concrete curing. Comprising the steps of manufacturing and installation of mass concrete reinforcing steel bars, laying of mass concrete cast iron circulating cooling water pipes, installation of the mass concrete wall integrated temperature control formwork, layered pouring of mass concrete, cooling water pipe circulating water cooling and plate face water storage maintenance, curing of the mass concrete wall integrated temperature control formwork and center construction of the mass concrete. Monitoring the temperature of the surface layer and the like. The device has the characteristics of reusability, energy conservation and high efficiency.
Owner:THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU

Concrete quality three-level monitoring device and method

The invention discloses a concrete quality three-level monitoring device and method, and belongs to the technical field of concrete construction. The method aims at solving the cracking problem caused by factors such as temperature stress and shrinkage stress in mass concrete construction and the key technical problems such as data islanding phenomenon and regulation and control lag in an existing monitoring method. According to the technical scheme, a three-level monitoring system of pouring layer-cooling layer-structural layer is constructed, and various key parameters such as temperature, humidity, flow velocity and cooling water flow of concrete in pouring, cooling and stabilizing stages are accurately monitored in real time; the central controller is used for carrying out real-time analysis processing and dynamic regulation and control on the data, so that comprehensive, accurate and continuous monitoring on the concrete construction quality is realized; the method is mainly applied to monitoring scenes of mass concrete construction quality, concrete cracking can be effectively prevented, the engineering quality and safety are remarkably improved, and reliable technical guarantee is provided for the concrete construction industry.
Owner:CHINA THREE GORGES UNIV

Intelligent temperature control method and system

The invention discloses an intelligent temperature control method and system, and belongs to the technical field of temperature control, and the method specifically comprises the steps: collecting the related data of a target region in real time; according to the relevant data of the target area, a four-field coupling dynamic prediction model is constructed, the temperature of the target area is predicted, the four-field coupling dynamic prediction model is constructed based on a four-field coupling model and the relevant data, collected in real time, of the target area, and the four-field coupling model is obtained based on simultaneous coupling of a basic field variable model; determining a cooling water pipe flow control strategy according to the predicted temperature of the target area; cooling the target area until the target temperature is reached; the temperature monitoring precision, the prediction accuracy and the control intelligence level of the mass concrete structure in the construction process are remarkably improved, the crack risk is effectively reduced, and the construction quality and the safety guarantee capacity are improved.
Owner:HENAN PROVINCIAL WATER CONSERVANCY FIRST ENG BUREAU

Phosphogypsum lightweight aggregate and preparation method thereof

The invention provides a phosphogypsum lightweight aggregate and a preparation method thereof. The phosphogypsum lightweight aggregate disclosed by the invention can be applied to mass concrete engineering, the utilization rate of sandstone is effectively reduced, and the ecological environment is protected. Meanwhile, the cylinder compressive strength of the prepared lightweight aggregate can reach 10 MPa or above, the apparent density is 1600-1920 kg / m < 3 >, the water absorption rate is 9-14%, when the lightweight aggregate acts in concrete, ultra-high performance concrete with the strength grade reaching 100 MPa or above can be prepared, and the hydration shrinkage condition of the concrete can be reduced while certain strength is kept. The method applied to engineering construction not only helps to solve the national problems of high consumption and utilization of ardealite and pollution prevention, but also can solve the shortage of materials required by infrastructure construction. Compared with common concrete, the concrete has higher market competitiveness.
Owner:WUHAN UNIV OF TECH

Temperature real-time monitoring method and system based on mass concrete continuous pouring

The invention discloses a temperature real-time monitoring method and system based on mass concrete continuous pouring, and the method comprises the steps: collecting data in a mass concrete continuous pouring process in real time through the arrangement of sensors, forming a global temperature set of temperature values at each collection moment, obtaining the temperature value of each layer at each collection moment according to pouring layering, and carrying out the real-time monitoring of the temperature of each layer; forming a layered temperature set of the temperature values of each layer; determining a concrete pouring abnormal index; determining a dynamic early warning threshold value in the concrete continuous pouring process, determining a multi-stage early warning and response mechanism according to comparison between the concrete abnormal index and the threshold value, and generating an early warning control signal; and based on the early warning control signal, controlling the water cooling equipment and carrying out real-time monitoring feedback. According to the method, the specific temperature conditions of each layer at different acquisition moments can be precisely known, the positions of the layers with abnormal temperature can be more precisely positioned, structural cracks caused by temperature incoordination between the layers are avoided, and real-time monitoring of the temperature of mass concrete continuous pouring is achieved.
Owner:THE THIRD ENG CO LTD OF CCCC FOURTH HARBOR ENG +1

Temperature control system model, construction method and application

The invention belongs to the technical field of mass concrete construction, and discloses a temperature control system model, a construction method and application. A water cooling technology is mostly adopted in traditional mass concrete construction, but water is difficult to take in special construction sites, a large number of water resources need to be wasted, temperature control measures of the traditional water cooling technology are lagged, and the crack probability is remarkably increased. According to the temperature control system model, the construction method and the application, a second-order response surface is used for fitting a multi-parameter temperature control system model, and the temperature control system model is corrected and optimized according to measured data acquired by a temperature control acquisition unit, so that a closed-loop control system is formed. The concrete grid units and the corresponding air guide pipes serve as minimum temperature control units, construction, temperature control and management are carried out, the management and control granularity is finer and more accurate, and a new research and development direction is provided for the temperature control technology of mass concrete construction.
Owner:CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP CO LTD

Temperature measurement method and system in mass concrete pouring process

The invention provides a temperature measurement method and system in a mass concrete pouring process, and relates to the technical field of mass concrete temperature measurement. The method comprises the steps that before mass concrete is poured, a plurality of metal pipes are evenly welded to vertical steel bars in a mass concrete formwork in the depth direction and the length direction of the mass concrete formwork, and position information of thin and solid bottoms of the metal pipes in the mass concrete formwork is obtained; taking down the piston of the metal tube, irradiating to the thin solid bottom of the metal tube by using a laser thermodetector, and obtaining the center temperature data of the thin solid bottoms of the plurality of metal tubes at a plurality of moments in the current temperature measurement period; determining an internal temperature score; acquiring environment temperature data and surface temperature data of a plurality of sampling points on the surface of the mass concrete; determining internal and external temperature difference scores; and determining a temperature measurement result. According to the invention, the temperature measuring process can be simplified through the metal tube and the laser temperature measuring instrument, the temperature measuring device is not easy to damage, and the temperature measuring cost is reduced.
Owner:GANSU THIRD CONSTR GROUP CORP

Special hydration temperature rise inhibitor for mass concrete and preparation method thereof

The invention relates to the technical field of concrete admixtures, and discloses a hydration temperature rise inhibitor special for mass concrete and a preparation method of the hydration temperature rise inhibitor. Comprising the following raw materials in parts by weight: 95 to 105 parts of borax, 50 to 60 parts of triethanolamine, 90 to 110 parts of gluconate, 190 to 200 parts of polycarboxylic acid and 95 to 105 parts of carboxyl-terminated hyperbranched polyester. According to the invention, by adopting the admixture to reduce hydration heat and prolong final setting time, the defects of large and concentrated heat release of common concrete and complex process, high cost and poor structural integrity of the traditional construction technology can be overcome, the problem of easy generation of temperature cracks in mass concrete is solved, the construction complexity is reduced, and the construction efficiency is improved. And the cracking phenomenon of mass concrete is improved, and the technical purposes of low cost, high efficiency and high adaptability are achieved.
Owner:CHINA RAILWAY 19TH BUREAU GROUP RAIL TRANSPORTATION ENGINEERING CO LTD +2

Vibrating device for large-volume concrete pouring construction of fan foundation

The invention belongs to the technical field of vibrating devices, and particularly relates to a vibrating device for large-volume concrete pouring construction of a fan foundation, the vibrating device comprises a vibrator, and one end of the vibrator is electrically connected with a vibrating rod through a connecting wire; a scraping mechanism is arranged on the surface of the vibrating rod, the scraping mechanism comprises a lantern ring fixedly connected to the surface of the vibrating rod in a sleeving mode, the interior of the lantern ring is hollow, an electric push rod is fixedly installed in the lantern ring, and a connecting rod is fixedly installed at the output end of the electric push rod; through reciprocating operation, concrete adhered to the surface of the vibrating rod can be quickly cleaned, so that the situation that the concrete on the surface of the vibrating rod is hardened and solidified, and subsequent cleaning is difficult is effectively avoided. And meanwhile, workers do not need to clean, so that the workload of the workers is reduced, and efficient cleaning operation can be achieved.
Owner:POWERCHINA CHONGQING ENG CO LTD

Mass concrete three-dimensional warehousing path planning method

The invention discloses a mass concrete three-dimensional warehousing path planning method, effectively solves the problem of coordinated control of concrete warehousing speed and pumping pressure in a complex space, and avoids segregation or cold seam defects caused by improper speed setting. A dynamic path correction mechanism guarantees the motion precision of the material distributing machine in a three-dimensional space, a data-driven self-optimization model remarkably improves the stability and the construction efficiency of the pouring process, and complete collection and accurate modeling of spatial data of a pouring area are further achieved. The problems of equipment collision risk and path planning deviation caused by incomplete measurement data in traditional construction are solved. Through multi-source data fusion and intelligent processing, it is ensured that the three-dimensional model accurately reflects spatial constraint conditions of an actual construction environment, a reliable geometric reference is provided for distribution machine arrangement and pumping path planning, and construction rework and resource waste caused by model distortion are avoided.
Owner:POWER CHINA KUNMING ENG CORP LTD +2