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319 results about "Sandcrete" patented technology
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Sandcrete is a yellow-white building material made from a binder (typically Portland cement), sand in a ratio of circa 1:8, and water. Sometimes other ingredients may be added to reduce the amount of expensive Portland cement such as pozzolanas and rice husk ash. Sandcrete is similar but weaker than mortar, for which the ratio is circa 1:5. Soil cement and landcrete are similar materials but use other types of soil and hydraform blocks which are compressed, stabilized, earth blocks.
Offshore wind turbine single pile rigidity numerical simulation method considering long-term circulation and scouring
According to the offshore wind turbine single pile rigidity numerical simulation method considering long-term circulation and scouring, the accuracy and the calculation convenience are both considered in model building through the linear elastic steel pipe pile model and the Mohr-Coulomb soil body model. By calculating the horizontal ultimate bearing capacity of the single pile, combining the ultimate analysis method and the p-y curve calculation method, the influence of different scouring depths on the fan is considered, the horizontal load bearing capacity and inherent frequency evolution of the single pile are comprehensively measured, and a basis is provided for design and safety evaluation. A sandy soil rigidity attenuation model is established for secondary development of Abaqus and verified, and the rigidity change of sandy soil under long-term cyclic loading is considered, so that the simulation precision is improved. And the numerical model is tested and verified to ensure the reliability. And the accumulated lateral displacement of the steel pipe pile can be accurately predicted, the influence rule of cyclic load times, soil elasticity modulus and embedding depth factors on displacement development is disclosed, wind power engineering design optimization is assisted, and economical efficiency and safety are improved.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
Environment-friendly ceramic and preparation method thereof
The invention discloses environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramic. The environment-friendly ceramic comprises the following raw materials in parts by weight: 30-50 parts of red mud, 20-40 parts of fly ash, 10-25 parts of purple clay, 5-15 parts of quartz, 3-8 parts of a composite binder, 3-8 parts of a composite fluxing agent and 40-50 parts of deionized water. The environment-friendly ceramic prepared by the method disclosed by the invention has excellent breaking strength and apparent porosity.
Owner:QUANZHOU DEHUA COUNTY JIA OULI HANDICRAFT CO LTD
Sandy soil reinforcement method combining modified chitosan film coating and cementation with biomimetic mineralization and application
The invention belongs to the technical field of sandy soil reinforcement, and relates to a sandy soil reinforcement method combining modified chitosan film coating and cementation with biomimetic mineralization and application, the sandy soil reinforcement method comprises the following steps: S1, chitosan is subjected to swelling, alkalization, carboxymethylation and refining treatment to obtain modified chitosan; s2, respectively preparing a calcium chloride solution and a sodium carbonate solution with the same concentration; a calcium chloride solution is a cementing solution A; adding modified chitosan into a sodium carbonate solution, and uniformly stirring to form a cementing solution B; s3, the cementing liquid A is sprayed to the sandy soil, then the cementing liquid B is sprayed, and primary cementing is completed; carrying out circulating cementing for 5-20 times according to the spraying mode; and then air drying is conducted to complete sandy soil reinforcement. According to the invention, the agglomeration among calcium carbonate particles is enhanced by utilizing the cementing, film covering, mineralized crystal form adjusting and filling coupling effects of the modified chitosan, so that the calcium carbonate particles form effective cementing connection among sand particles, thereby improving the mechanical properties of the sand.
Owner:TIANJIN UNIV
Numerical model construction method of open pile soil plug effect based on material point method
The invention discloses a material point method-based open pile soil plug effect numerical model construction method, which comprises the following steps: carrying out an indoor semi-model tank test by adopting standard sandy soil, and recording data of friction resistance of the inner side and the outer side of a pile, soil stress, soil plug height and a displacement field in a pile sinking process; a geometric model is established based on an indoor model test, numerical simulation is performed by adopting a two-dimensional axisymmetric substance point method in combination with a grid encryption strategy, and data of friction resistance of the inner side and the outer side of a pile, a soil stress field, the soil plug height and a displacement field are obtained; performing comparative analysis on the indoor test data and the numerical simulation result, and if an error meets a preset requirement, confirming the validity of the numerical model; and if the comparison result does not meet the requirement, optimizing the numerical model. The soil plug effect in the pile sinking process can be effectively simulated, the response of the open pile to a stress field and a displacement field of a surrounding soil body can be deeply researched, and a more accurate basis can be provided for structural design and bearing capacity calculation of the open pile.
Owner:ZHEJIANG UNIV
Oil sludge and sand resourceful treatment method and system
PendingCN120553947ASludge treatment by de-watering/drying/thickeningMaterial analysis using wave/particle radiationOil sludgeProcess engineering
The invention relates to the technical field of oily solid treatment, and discloses an oily sludge and sand resourceful treatment method and system.The oily sludge and sand resourceful treatment method comprises the following steps that oil sludge is subjected to component analysis, and the oil content, the heavy metal type and sandy soil particle size distribution data are obtained; based on data of component analysis, adopting a microwave field to carry out dynamic pretreatment on the oil sludge, adjusting microwave parameters through coupling electromagnetic field distribution and a heat conduction model, and separating oil and sand; the pretreated sandy soil is subjected to flora combination optimization biodegradation, the flora proportion is screened based on a strain degradation efficiency matrix, and residual pollutants are degraded; and according to the biodegraded residue components, a recycling path is matched, and a regenerated material is formed. The invention provides an oil sludge and sand full-process treatment method based on microwave dynamic regulation and control, flora combination optimization and a multi-objective decision model. Integrated cooperative control of oil-sand efficient separation, multi-pollutant deep degradation and residue accurate recycling is achieved.
Owner:SHANDONG TIANHUI PETROLEUM TECH CO LTD
Mould bag sand cofferdam MPM simulation method and system based on artificial intelligence
ActiveCN120562220AGeometric CADDesign optimisation/simulationNumerical stabilityDimensional simulation
The invention belongs to the technical field of crossing of artificial intelligence and computational mechanics, and particularly relates to an artificial intelligence-based MPM simulation method and system for a mold bag sand cofferdam, a three-dimensional simulation system of the mold bag sand cofferdam is constructed in combination with an MPM method, and the penetration state of sand and geotechnical cloth is detected in an accelerated manner by utilizing a penetration tracking algorithm and spatial Hash. An artificial intelligence algorithm is introduced, a reward function is designed with minimum penetration depth and penetration times as targets, penetration prediction of MPM particles is driven, the speed and stress of the MPM particles are further dynamically regulated and controlled on the basis of a predicted contact model and the artificial intelligence algorithm, penetration is prevented, numerical stability is ensured, and the prediction accuracy of the MPM particles is improved. The calculation precision is improved by adopting implicit integration and gradient descent methods; and bidirectional coupling of the sand and the geotechnical cloth is realized through a visualization module. The problems that in a traditional method, coupling simulation of sandy soil and a flexible structure is low in efficiency, easy to penetrate, unstable in numerical value and the like are solved, and the accuracy and reliability of simulation analysis of the mold bag sand cofferdam structure under the complex working condition are remarkably improved.
Owner:GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
Construction method of deepwater lock catch steel pipe pile cofferdam
The invention belongs to the technical field of bridge engineering, and particularly relates to a deepwater lock catch steel pipe pile cofferdam construction method which comprises the following steps: construction preparation: delimiting a steel pipe pile cofferdam area; drilling and groove milling are carried out along the steel pipe pile cofferdam area to form a cofferdam groove, and sandy soil is backfilled in the cofferdam groove; a guide device is lowered along the bored pile steel casing, and steel pipe piles are inserted one by one to form a steel pipe pile cofferdam; a plurality of inner supporting systems are assembled; a covering layer is excavated on the inner side of the steel pipe pile cofferdam to the designed elevation; underwater grouting is conducted on the inner sides and the outer sides of the steel pipe piles located in the cofferdam grooves; the multiple inner supporting systems are sequentially lowered to the designed elevation; a gap between each enclosing purlin structure and the steel pipe pile is checked; the bottom of the foundation pit is cleaned, water is pumped layer by layer, and concrete is poured between the enclosing purlin structure and the steel pipe piles till water pumping in the cofferdam is completed; the bearing platform / pier body is constructed, and backwater of the corresponding inner supporting systems is sequentially removed along with construction of the bearing platform / pier body till water flows out of the bearing platform / pier body; and dismantling the steel pipe pile cofferdam.
Owner:COASTAL RAILWAY ZHEJIANG CO LTD +3
A microbial grouting treatment soft foundation construction structure and construction method thereof
The present application relates to a microbial grouting treatment soft foundation construction structure and its construction method. The scheme includes the following steps: improving the shear strength and bearing capacity of the soft foundation and reducing the compressibility and permeability of the foundation soil by setting up heap loading, microbial high-pressure rotary jet piles and microbial tree root steel pipe piles; draining the moisture in the foundation and eliminating or weakening the liquefaction characteristics of the foundation soil by heap loading in conjunction with drainage steel pipes, mesh water collection pipes and pumps; and improving the cooperative working ability of the microbial high-pressure rotary jet piles and the soil between the piles by setting up a microbial sand solidification layer, ensuring deformation coordination and preventing uneven settlement. The grouting material adopts a two-component microbial grouting material, which is safe, clean and environmentally friendly. The microbial induced calcium carbonate precipitation material has the advantages of fast speed and high efficiency. The induced precipitation of calcium carbonate can be completed in about a few hours, which greatly shortens the construction period and will not cause sewage to flow across the land and pollute the environment.
Owner:FUJIAN GEOLOGICAL ENG SURVEY INST +3
Magnesium slag-based multi-solid-waste shield wall post-grouting slurry and preparation method thereof
The invention discloses magnesium slag-based multi-solid-waste shield wall post-grouting slurry and a preparation method thereof. The magnesium slag-based multi-solid-waste shield wall post-grouting slurry is prepared from the following components in parts by weight: 100 parts of shield muck and 20 parts of a cementing material, and the water-binder ratio is 1.95-2.15; the cementing material is composed of magnesium slag, slag, cement and gypsum. According to the invention, the sandy soil in the shield muck is used as a main raw material, a large amount of magnesium slag and slag and a small amount of cement and gypsum are used as cementing materials to prepare the backfill grouting slurry, and the waste is reused, so that the pollution of the waste to the environment is reduced, and the material cost of the backfill grouting slurry is reduced.
Owner:SHAANXI ACAD OF ARCHITECTONICS +1
Microorganism solidification inclined deposition surface sandy soil hollow cylinder sample preparation device and use method
The invention discloses a microorganism solidification inclined deposition surface sandy soil hollow cylinder sample preparation device and a use method. The sample preparation device comprises a hollow cylinder mold and a supporting pedestal for the hollow cylinder mold to rotate. One end of the hollow cylindrical mold can be lifted to a proper angle through a supporting rod with threads and a U-shaped hoop which are arranged on a supporting pedestal, so that a deposition surface inclined at any angle of a sample is vertical to the ground; a peristaltic pump is connected with a grouting channel distributed on the inner cylinder, and grout is input into the hollow cylindrical sample. Slurry can flow along the deposition surface under the action of gravity, the phenomenon that microorganisms are preferentially attached to the area close to the grouting hole is weakened while the grouting efficiency is improved, disturbance of slurry flowing to the inclined deposition surface of the sample is reduced, and the problems that a traditional grouting method is low in efficiency and large in disturbance to the sandy soil sample on the inclined deposition surface are solved. Therefore, the stability of the inclined deposition surface of the sample is ensured, and the preparation quality and test result reliability of the microorganism solidification inclined deposition surface sample are improved.
Owner:NANJING TECH UNIV +1
Passable pipe bag hydraulic reclamation cofferdam structure
The utility model provides a passable pipe bag hydraulic reclamation cofferdam structure, which belongs to the technical field of cofferdam construction and comprises a geogrid layer fixedly arranged at the bottom of a river, a through bag layer laid on the geogrid layer, a lower cofferdam layer and an upper cofferdam layer. The cofferdam lower layer comprises a first left side pipe bag and a first right side pipe bag which are laid on the through bag layer, an inverted-T-shaped center area is formed between the first left side pipe bag and the first right side pipe bag, and the inverted-T-shaped center area is filled with a first layer of sand soil structure in a blowing mode. The problem that existing cofferdam construction is insufficient in stability and traffic capacity is solved, and the method has the advantages of being simple, easy to implement, high in operability, efficient and reliable and can be widely applied to cofferdam field construction.
Owner:SINOHYDRO BUREAU 6 CO LTD
High-bearing-capacity slope revetment structure in sandy soil environment
The utility model discloses a high bearing capacity slope revetment structure in a sandy soil environment, which comprises a slope body, a slope toe section is arranged at the lower end of the slope body, a slope top section is arranged at the higher end of the slope body, retaining side walls are arranged on the outer sides of the slope toe section and the slope top section, and the retaining side walls are connected with the slope toe section and the slope top section. A downwards-sunken arc pit is dug in a side slope body in the direction from a slope toe section to a slope top section, geotechnical cloth layers are arranged on the top face of the slope toe section, the top face of the slope top section and the bottom in the arc pit, geocell layers are arranged on the surfaces of the geotechnical cloth layers, and the geocell layers are fixed to the side slope body through anchor rod assemblies. A non-woven fabric cushion layer, a thick sand soil layer and a planting soil layer are sequentially arranged on the top surface of the geogrid layer from bottom to top. According to the utility model, the construction period can be greatly shortened, the construction and maintenance cost can be reduced, the stability of the slope body can be improved, the overall bearing capacity and stability of the sand slope can be greatly improved, and a better revetment slope protection effect can be achieved.
Owner:KUNMING SCI & TECH PAN ASIA DESIGN GRP CO LTD
Deep foundation pit supporting system and construction method suitable for different stratigraphic structures
A deep foundation pit supporting system suitable for different stratigraphic structures, comprising a sealed bag (1), freezing pipes (2), vacuum pipes (3), a reinforcing cage (4), and sand (5). The sealed bag (1) is disposed in a groove section formed in a foundation around a foundation pit, and the reinforcing cage (4), the sand (5), the multiple freezing pipes (2), and the multiple vacuum pipes (3) are all disposed in the sealed bag (1). Upper ends of the freezing pipes (2) and the vacuum pipes (3) pass through an upper end surface of the sealed bag (1), and are then connected to a cold source and a negative pressure source, respectively. The sealed bag (1), having undergone vacuum evacuation and freezing treatment, together with the reinforcing cage (4), the sand (5), the freezing pipes (2) and the vacuum pipes (3) inside, forms a frozen vacuum reinforced sand wall, and multiple sections of frozen vacuum reinforced sand wall are connected end to end to form a retaining wall distributed around the foundation pit.
Owner:NI GUIRONG
Intelligent washing and sorting equipment for sand grading
Owner:FUJIAN SOUTHERN HIGHWAY MECHANICAL CO LTD
Fan foundation pile foundation construction method
The invention relates to the technical field of fan foundations, and provides a fan foundation pile foundation construction method which comprises the following steps that a cement soil mixing pile is constructed in the center of a prestressed pipe pile, and the diameter of the cement soil mixing pile is larger than that of the prestressed pipe pile; during construction of the cement-soil mixing pile, thin slurry is sprayed during downward drilling for the first time, thick slurry is synchronously sprayed during drilling lifting, the repeated stirring frequency is not less than 2 times, and the cement-soil mixing pile with the pile bottom elevation not higher than the designed bottom elevation of the prestressed pipe pile is formed; before the cement soil mixing piles are solidified, the prestressed pipe piles are pressed into the designed depth; the pile sinking problem in high underground water and dense sandy soil geology can be solved, the physical and mechanical properties of soil around the pile are effectively improved by constructing the cement soil mixing pile with the larger diameter in the center of the prestressed pipe pile, the problem that pile sinking cannot be achieved under the dense sandy soil geology condition can be effectively solved, and the pile sinking method is suitable for various soil layers and hard soil layers containing dense sandy soil and the like; and the application range of the prestressed pipe pile is widened.
Owner:湖南三一智慧新能源设计有限公司
Filler-free double-shaft multi-dimensional vibroflotation device for hydraulic filling of sand foundation
The utility model is suitable for the technical field of hydraulic fill sand foundation vibroflotation, and provides a filler-free double-shaft multi-dimensional vibroflotation device for a hydraulic fill sand foundation, which comprises a mounting frame, the vibrating rods are symmetrically arranged on the mounting frame; the vibrating head is arranged on the vibrating rod and is used for carrying out vibroflotation operation on the hydraulic reclamation sand foundation; and the exhaust mechanism is assembled on the vibration rod and is used for exhausting during sand liquefaction. According to the filler-free double-shaft multi-dimensional vibroflotation device for the hydraulic filling sand foundation, filler-free double-station vibroflotation operation can be conducted on the hydraulic filling sand foundation, and the overall vibroflotation operation efficiency is effectively improved.
Owner:CHANGJIANG WUHAN WATERWAY ENG CO
Material collecting device for casting sand box machining
The utility model provides a material collecting device for casting sand box machining, and belongs to the technical field of casting auxiliary devices. The material collecting device for casting sand box machining comprises a supporting frame and a material receiving mechanism, an operation table is installed at the top of the supporting frame, moving wheels are installed at the bottom of the supporting frame, a material frame is movably connected to the top of the operation table, a stabilizing rod is movably connected into the material frame, and a collecting cavity is formed in the top of the operation table. By arranging the material receiving mechanism, when a worker adds sandy soil into an external sand box at the top of the operation table, the material receiving mechanism can receive and work in a centralized mode on the outer side of the sand box in the sandy soil adding process; and the situation that the sandy soil is difficult to receive and concentrate when the operation table is used is avoided, so that the sandy soil receiving and concentrating effect of the operation table is improved.
Owner:INNER MONGOLIA LONGMA CASTING CO LTD
Lifting transport device for sandboxes for foundry
The application discloses a lifting type transportation equipment for casting sand boxes, and relates to the technical field of sand box transportation.The lifting type transportation equipment comprises a base, a platform arranged above the base, an adjusting mechanism arranged above the platform, a square groove, a conveying belt support, a sliding rod and two servo motors, the square groove is arranged on the upper surface of the platform, four electric push rods are fixedly connected to the inner wall of the square groove, the conveying belt support is fixedly connected to the telescopic end of each electric push rod, and the output rotating shaft of each servo motor is fixedly connected with a rotating rod.The lifting type transportation equipment can be mutually matched with the adjusting mechanism and the platform, the sealing cover and the four mounting frames can comprehensively protect the sand box when the sand box is transported, the problem of sand leakage caused by external factors when the sand box is transported is effectively solved, and the stability of the device during transportation is improved.
Owner:芜湖久弘重工股份有限公司
Anti-blocking drum screen easy to clean
The utility model discloses an anti-blocking easy-to-clean drum screen, which belongs to the technical field of sorting equipment and comprises a frame and a hopper, a driving component and a mounting seat are arranged at two ends of the frame, a screen drum is arranged between the driving component and the mounting seat, a rotating component is arranged in the screen drum, and a vibrating component is arranged in the rotating component. A discharging slope is arranged on the frame corresponding to the output end of the screen drum, a steel wire roller is arranged on the frame corresponding to the drum wall of the screen drum, and the hopper is located at the input end of the screen drum. By arranging the driving assembly, the sun gear drives the vibrating assembly to rotate at a high speed, the vibrating assembly enables the screen drum to vibrate, the sun gear drives the planetary gear and the rotating assembly to rotate at a low speed, and the rotating assembly drives the screen drum to rotate; sandy soil is separated from broken stones through vibration of the vibration assembly and rotation of the screen drum, attached wet sandy soil falls off through vibration of the vibration assembly, a small amount of residual attachments are swept away through the steel wire roller, and the cleaning efficiency is improved.
Owner:ZHONGSHAN HUAYU NONFERROUS METALLURGY MATERIALS CO LTD
Sand slope anti-sliding construction system for seasonal fluctuation of underground water
The present application relates to geotechnical engineering slope reinforcement technical field, disclose a kind of sandy soil slope anti-slide construction system for seasonal fluctuation of groundwater, comprising: the liquid level monitoring unit is buried to the inside of hollow anti-slide pile in advance, and is distributed at the groundwater level of potential sliding surface of slope, monitoring water level change;Control unit fuses the signal of multiple-point liquid level meter monitored in real time, and starts and stops vacuum pump according to preset dynamic threshold;Flange interface is arranged at the top of hollow anti-slide pile, and vacuum pump is connected by bottom pipe inserted into pile, so that anti-slide pile is coupled with active dewatering well;When automatic control unit detects that water level reaches threshold, vacuum pump is opened, and groundwater is pumped to reservoir by vacuum pump, so that water level is lowered, and the stability of sandy soil is maintained.The present application breaks through the limitation that traditional slope support scheme is difficult to adapt to seasonal water level amplitude change, and can effectively solve the problem that sandy soil slope seepage instability is caused by seasonal change of groundwater level.
Owner:INNER MONGOLIA PINGXI BAIYINHUA COAL IND CO LTD +2
Preparation method of hydrate stratum simulation sample
PendingCN120232692AMaterial analysis using sonic/ultrasonic/infrasonic wavesPreparing sample for investigationEpoxyPressure stabilization
The invention provides a preparation method of a hydrate stratum simulation sample. The method comprises the following steps: uniformly mixing quartz sand and clay to prepare base sand, and further uniformly mixing the base sand with epoxy resin and polyamide resin to prepare a hydrate stratum simulation sample skeleton; uniformly mixing the simulated formation water with a surfactant to obtain a first solution; uniformly mixing the hydrate stratum simulation sample skeleton with the first solution to reach a preset water content to obtain a mixed sandy soil water sample; arranging a screen pipe for a simulation shaft in a high-pressure kettle, adding the mixed sandy soil water sample into the high-pressure kettle according to distribution points of temperature and pressure sensors in a layered manner, compacting after the addition of one layer of mixed sandy soil water sample is completed, adding the layer of sensors after compaction until the reaction kettle is full, and compacting to obtain a stratum core skeleton; and covering the top cover of the high-pressure kettle, injecting methane gas into the high-pressure kettle from the top and the bottom at the same time under the simulated formation temperature condition until the pressure reaches 10-15 MPa, and standing for reaction until the pressure in the high-pressure kettle is stable to obtain the hydrate formation simulation sample.
Owner:PETROCHINA CO LTD
A method for removing fine particles from a sand fill foundation
ActiveCN119121903BEfficient removalSimple structureArtificial islandsFatty/oily/floating substances removal devicesClassical mechanicsStructural engineering
This invention relates to the field of engineering foundation construction, specifically disclosing a method for removing fine particles from dredged sandy soil foundations. The method includes a pipeline, an upper rod, a suction pipe, and a cone. The upper rod contains a high-pressure water pipe, a high-pressure air pipe, and a suction pipe, all connected to the pipeline. The suction pipe, from the outside in, consists of an outer shell, a filter screen, and a suction chamber. The outer shell has several suction holes and several high-pressure air jet holes, connected to the high-pressure air pipe, and the suction chamber is connected to the suction pipe. The cone's tip has a high-pressure water jet hole connected to the high-pressure water pipe. Several vibrating rods are fixedly installed within the upper rod and suction pipe. This invention's fine particle removal equipment penetrates deep into the soil layer and removes fine particles through suction and filtration. It has a simple structure, is easy to implement, has low construction costs, and is convenient to operate. It can effectively remove fine particles from dredged sandy soil foundations, greatly reducing the difficulty of dredged sandy soil foundation treatment construction.
Owner:CCCC FOURTH HARBOR ENG INST CO LTD +1
Steel sheet pile supporting structure
ActiveCN224133760UEasy to fixMake up the distance differenceExcavationsBulkheads/pilesArchitectural engineeringSheet pile
The utility model discloses a steel sheet pile supporting structure which is applied to the field of steel sheet piles and comprises a first pile plate, a second pile plate is arranged on the back face of the first pile plate, fixing frames are connected to the opposite sides of the first pile plate and the second pile plate in a bolted mode, and connecting blocks are arranged in the fixing frames. And two screw rods are arranged at the top of the connecting block in a penetrating mode, the two ends of each screw rod are welded to the interior of the fixing frame, the bottom ends of the surfaces of the screw rods are in threaded connection with adjusting nuts, and through grooves are formed in the first pile plate and the second pile plate correspondingly. The device can have the height adjusting function, can make up the distance difference generated when a steel sheet pile is driven in, facilitates installation and fixation of profile steel by personnel, is good in flexibility, can conveniently pull out a pile plate outwards, is simple and convenient to operate, can prevent sand or fluid from passing through, facilitates penetration of a hook for leveraging force, and is high in practicability.
Owner:南京图信新材料科技有限公司
Multi-scale fiber-reinforced high-fluidity anti-cracking fluid state solidified soil and preparation method thereof
The invention relates to the technical field of building materials, and particularly discloses multi-scale fiber reinforced high-fluidity anti-crack flow state solidified soil and a preparation method of the multi-scale fiber reinforced high-fluidity anti-crack flow state solidified soil. Comprising the following raw materials in parts by weight: 75-85 parts of sandy soil, 10-30 parts of a cementing material, 1-3 parts of modified chopped steel fibers, 0.05-0.15 part of carbon nanotubes, 0.02-0.04 part of a silane coupling agent, 0.35-0.6 part of a rheology modifier and 15-25 parts of water. Wherein the modified chopped steel fiber is subjected to surface modification, and the surface of the modified chopped steel fiber is coated with a coating containing epoxy resin microspheres. The multi-scale fiber reinforced high-flowability anti-crack fluid state solidified soil can be used for reinforcement and repair of engineering projects such as bridges, tunnels and slope protection, and has the advantages of high strength and good crack resistance.
Owner:CHINA CONSTR WESTERN CONSTR NORTH CO LTD
Sand soil solidification strength test device capable of carrying out comparison and reference
The utility model relates to the technical field of sand solidification strength test, in particular to a sand solidification strength test device capable of performing comparison reference, which comprises a bottom cylinder, a turntable and a vertical prism, a test cylinder is detachably inserted in the top surface of the turntable at the position matched with each edge of the vertical prism, and a compression ring is longitudinally arranged in each test cylinder in a sliding manner; and an injection assembly longitudinally penetrates through the compression ring in a sliding manner. Sandy soil solidification environments with different relative densities are simulated by adjusting the longitudinal position of the compression ring, and the influence of reaction liquid injected at different depths on the sandy soil fixation strength is researched by controlling the depth of the injection assembly inserted into the test cylinder. Meanwhile, different reaction liquids can be injected into the test cylinder to research the influence of different microbial additives on the sandy soil fixing strength, in a single test, regulation and control of different variables are completed, repeated tests are avoided, the test time is shortened, and the test efficiency is improved.
Owner:LONGJIAN ROAD & BRIDGE CO LTD
Coastline protection structure and construction method thereof
The invention discloses a construction method of a coastline protection structure, which comprises the following steps: excavating a foundation trench, laying a sandy soil and gravel alternate composite layer in layers, compacting, mounting a prefabricated reinforced concrete frame structure on the surface, connecting polygonal frame units by pre-embedding twisted steel, filling high-density polyethylene particles in through holes, covering steel wire meshes, and carrying out construction. And meanwhile, a drainage blind ditch with a drainage pipe wrapped by double-layer permeable geotextile is arranged on the back sea side, and the drainage pipe with the longitudinal gradient larger than or equal to 5% extends to the position below the low tide level line to form a multidirectional drainage path. The method is suitable for coastline protection with frequent tidal range, can effectively reduce the risk of emptying the base, inhibits the dispersion of the filler, adapts to the differential settlement of the foundation, and maintains the ecological function of the intertidal zone.
Owner:CHINA HARBOUR ENGINEERING
Saturated sand dynamic constitutive model construction method considering pore pressure fluctuation increase
The invention relates to a saturated sand dynamic constitutive model construction method considering pore pressure fluctuation growth, which comprises the following steps: determining total pore water pressure including residual pore pressure component and transient pore pressure component, and constructing a normalized stress ratio skeleton curve independent of a pore pressure state; correcting the total pore water pressure to obtain corrected pore water pressure, and updating the average effective stress at the current moment by using the corrected pore water pressure; coupling the normalized stress ratio skeleton curve and the updated average effective stress to obtain a maximum shear stress value; the maximum shear stress value is used as a target state point, a dynamic virtual hysteretic curve is constructed, the stress-strain behavior of saturated sandy soil is described, accumulated damage and alternate shear shrinkage-shear expansion effects of a soil body in the cyclic loading process can be effectively considered, a pore pressure development curve and cyclic shear stress-strain response which better conform to the test rule are captured, and the test accuracy is improved. And a valuable tool is provided for evaluating the response and liquefaction strength of the saturated sand under the undrained cyclic loading condition.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Fine-grain tailing sand soil layer exploration drilling hole-forming control method
The invention provides a fine-grain tailing sand soil layer exploration drilling hole forming control method. The control method mainly aims at control in the drilling exploration process of a soil layer formed by accumulation of fine-grain tailing sandy soil, and specifically comprises the steps that before the water level is initially seen, dry drilling is carried out, a casing pipe is adopted for wall protection after water breakthrough, and after water level observation is stable, slurry is adopted for wall protection drilling; when the particle size components of the deposits mainly comprise tail silt and tail silt, common bentonite slurry is adopted for slurry retaining wall drilling; when the particle size components of the deposits mainly comprise tail silty clay and tail clay, the slurry protecting wall adopts Keel chemical slurry; in the drilling process, the drilling speed is not higher than 285-295 r / min for accumulation bodies with the hole depth within 60 m; drilling is conducted on an accumulation body with the depth of 60-120 m at the low speed of 142 r / min, and the bit pressure is adjusted in real time. Through selection of wall protection modes with different particle sizes and quantitative control of key operation procedures, the drilling and coring efficiency can be greatly improved, and in-hole accidents and the production cost are reduced.
Owner:WUHAN SURVEYING GEOTECHN RES INST OF MCC
A method for vibration isolation of a model tunnel in a centrifuge model test
The application discloses a vibration reduction and isolation device for a model tunnel in a centrifugal model test, which comprises a model box, the periphery and the bottom surface of the inside of the model box are paved with damping materials, the model box is filled with sand, an aluminum pile and the model tunnel are placed in the sand, the model tunnel is located on one side of the aluminum pile, a vibration exciter is in contact with the aluminum pile, the vibration exciter is fixedly connected with a movable rod, and a plurality of acceleration sensors are arranged at the aluminum pile, the sand and the model tunnel. According to the application, the structure is simple, the operability is strong, the result is intuitive, the cost is low, the vibration of the model tunnel in the centrifugal model test can be effectively reduced, and the vibration reduction and isolation measures in the tunnel with strict vibration requirements in the city can be guided.
Owner:TONGJI UNIV +1
Expanded-base rotor steel pipe pile and construction technology thereof
PendingCN121781581AIncrease horizontal load resistanceImprove bearing capacityBulkheads/pilesClassical mechanicsPipe
The invention relates to the technical field of building construction, in particular to a bottom-expanded rotor steel pipe pile and a construction technology thereof.The bottom-expanded rotor steel pipe pile comprises a pile body steel pipe, a bottom-expanded wing ring and a pile top grouting blind plate, one end of the pile top grouting blind plate is a connector end, and the connector end is connected with the power end of a drilling machine; the rotary cutting is performed through the bottom-expanded wing ring; an injection cavity is formed in the pile body steel pipe. According to the bottom-expanded rotor steel pipe pile, the large bearing capacity can be provided under the small diameter. The steel pipe pile can form a larger bearing area in soil, so that the bearing capacity of a single pile is remarkably improved, and the steel pipe pile is suitable for various types of soil and rocks including soft soil, sandy soil, cohesive soil, soft rocks and the like. The rotary cutting mode is adopted for burying, the construction process is relatively simple and rapid, and the construction efficiency can be remarkably improved. And meanwhile, a large amount of slurry treatment and dumping operation are not needed, so that the construction time and cost are further saved.
Owner:TIANJIN BINHAI CONSTRUCTION TECHNOLOGY CO LTD