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215 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.
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
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
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
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
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
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
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
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
Raw material crushing equipment in machine-made brick production
The utility model relates to the technical field of raw material crushing equipment, and provides raw material crushing equipment in machine-made brick production, which comprises a crushing box, a feeding cavity and a discharging cavity are arranged in the crushing box, the feeding cavity is communicated with the discharging cavity, the bottom side of the inner cavity of the feeding cavity is symmetrically and fixedly connected with limiting plates, and the limiting plates are arranged in the feeding cavity. Smashing rollers are symmetrically and rotationally connected between the two limiting plates, and a screening assembly is arranged in the feeding cavity. The screening assembly comprises a supporting frame fixedly connected to the interior of the feeding cavity, and a screening plate is slidably connected to the interior of the supporting frame. Sandy soil smashed by the two sets of smashing rollers is filtered and screened through the vibrating screening plate in the supporting frame, so that the sandy soil conforming to the particle size falls off from a screening net in the screening plate, and the screening efficiency is improved. And the stones are conveyed to the outer end of the crushing box through the conveying belt, the gravels with large particle sizes are discharged from the gravel opening, in the stone crushing process, the stones are conveniently screened, and the production quality of the bricks and the stones is improved.
Owner:HANDAN YIER RECYCLING TECH CO LTD
Protection structure for pipelines near foundation pit
ActiveCN223953619UPipe elementsPipe protection against damage/wearLine tubingArchitectural engineering
The utility model relates to the technical field of pipeline protection, and discloses a protection structure for pipelines near a foundation pit, which comprises a U-shaped supporting plate and a cover plate, a pipeline is arranged in the U-shaped supporting plate, a connecting component is arranged at the top of the U-shaped supporting plate, the U-shaped supporting plate is rotatably connected with the cover plate through the connecting component, and sand is filled between the pipeline and the U-shaped supporting plate; the connecting assembly comprises a steel sleeve and a steel pipe, the steel sleeve is connected to the top end of the U-shaped supporting plate, a mounting seam is formed in the top of the steel sleeve, a plurality of first arc-shaped seams and a plurality of second arc-shaped seams are formed in the two sides of the inner wall of the mounting seam correspondingly, the steel pipe is inserted into the inner wall of the steel sleeve, and a plurality of connecting steel bars are connected to the surface of the steel pipe. The positions of the multiple connecting steel bars correspond to the positions of the multiple first arc-shaped seams one to one, and one ends of the multiple connecting steel bars are connected with the surface of the cover plate. According to the pipeline protection structure near the foundation pit, the U-shaped supporting plate and the cover plate are arranged, the periphery of the pipeline is completely closed, the integrity is good, and the pipeline protection effect is better.
Owner:CCCC THIRD HARBOR ENGINEERING CO LTD
Construction machine
Provided is a construction machine capable of loading a load into a container (71) with a reduced deviation. The construction machine is provided with a controller, and the controller selects a release operation from a plurality of candidate operations according to the condition in the container (71). Among the plurality of candidate actions, the planar view areas of the sand released into the container (71) and diffused by the respective candidate actions are different from each other.
Owner:KOBELCO CONSTR MASCH CO LTD
Construction method for treating water-falling sand foundation in sandy soil area
The invention discloses a construction method for treating a water falling sand foundation in a sandy soil area. The construction method comprises a site exploration field and cofferdam or surrounding edge isolation construction procedure and a water falling treatment construction procedure. The site exploration site and cofferdam or surrounding edge isolation construction procedure comprises the steps that after the site is excavated to the specified elevation, cofferdam or surrounding edge construction is conducted after the situation that no cultural relics, garbage and obstacles exist is checked and accepted through drill rod detection; the water drop treatment construction process comprises the following steps: preferentially using settled water or accumulated water on site, and using tap water as a water source when no settled water or accumulated water exists; during water injection, high-pressure water is not adopted for injection, and low-pressure water needs to flow automatically, so that the sand layer is prevented from being scoured to form larger pits and bags. Compared with a traditional foundation treatment mode, the method has the beneficial effects of being economical and environmentally friendly; the construction cost can be greatly reduced, and the influence of construction on the environment is reduced; the foundation treatment construction speed can be increased, and the construction period is guaranteed; the form of sand and a sand layer can be changed, the permeability is reduced, and the adverse effect of moisture on a foundation is reduced.
Owner:SHANGHAI BAOYE GRP CORP
A device for reinforcing and repairing a water conservancy channel slope landslide
The utility model discloses a water conservancy channel side slope landslide reinforcement repair device, including water conservancy channel main part, water conservancy channel main part inside is "V" shape structure, the recess is seted up in water conservancy channel main part inner wall, the recess inside is provided with the net box, and the net box is filled with the support stone piece, the inner wall of water conservancy channel main part is paved with waterproof cloth, and the waterproof cloth outer wall is provided with the geocell, the diamond through -hole is seted up in the geocell inside, and the diamond through -hole inside is filled with sand soil stable layer, and the geocell inside is filled with sand soil stable layer, and is provided with ecological protection layer on the geocell, and the water conservancy channel main part inner wall is provided with the net box, the net box, waterproof cloth, geocell, sand soil stable layer and ecological protection layer all about the bisecting line of water conservancy channel main part are left and right symmetry distribution, and the net box is located the lower extreme of geocell. The device can realize the fast repair of water conservancy channel main part side slope, to realize the normal use of water conservancy channel main part fastest.
Owner:JIANGXI HYDROPOWER ENG BUREAU
Method for estimating dynamic elastic modulus of basalt fiber cement silty soil for roadbed in seasonal frozen region
ActiveCN120890801APreparing sample for investigationMaterial strength using tensile/compressive forcesTriaxial shear testStatistical analysis
The invention discloses a basalt fiber cement silty soil dynamic elastic modulus estimation method for a subgrade in a seasonal frozen region, which comprises the following specific steps: preparing a sample, performing a freeze-thaw cycle test on the sample, then performing a graded loading dynamic triaxial test to obtain dynamic stress and dynamic strain of a soil body under different confining pressures, drawing a hysteretic curve, and estimating the dynamic elastic modulus of basalt fiber cement silty soil on the basis of a Hardin-Drnevich hyperbola model. The maximum dynamic elastic modulus and the final dynamic stress amplitude of the sample are obtained, reference dynamic strain is introduced, and the normalized secant dynamic elastic modulus is obtained; based on a nonlinear least square method, statistical analysis is carried out on test data under the action of different confining pressures and freezing and thawing cycle times, and a pre-estimation model representing correlation between the maximum dynamic elastic modulus and the final dynamic stress amplitude and the confining pressures and the freezing and thawing cycle action times is obtained; through nonlinear regression analysis, obtaining a prediction model of the maximum dynamic elastic modulus and the final dynamic stress amplitude considering the confining pressure and the freeze-thaw cycle effect, and further obtaining a normalized secant dynamic elastic modulus; the method improves the estimation efficiency.
Owner:JILIN JIANZHU UNIVERSITY
Sandy soil piping port particle motion test device and method
The invention discloses a sand piping port particle motion test device and method. The device comprises a test model, a water injection mechanism and an observation system, the test model comprises a test model container and a sand test cylinder, an inner cavity of the test model container is provided with an annular separation mounting part, and the outer side surface of the separation mounting part is fixedly connected with the inner cavity wall of the test model container in a sealing manner; the sandy soil test cylinder is fixedly and hermetically connected to the inner side of the separation mounting part; a bottom supporting net is arranged at the bottom of the sandy soil test cylinder, and the mesh size of the bottom supporting net is smaller than the size of the test sandy soil; the observation system comprises an image acquisition module, a pressure measurement module and a data processing center; each pressure measuring module comprises a pressure measuring pipe and a pressure difference sensor, and one end of each pressure measuring pipe is communicated with the corresponding pressure difference sensor through a hose. According to the invention, the sand movement process of the piping port can be accurately simulated, effective data can be collected, and the risk of piping damage can be researched.
Owner:GUANGDONG UNIV OF TECH
Casting part shakeout device with filtering function for casting production and processing
The utility model provides a casting part shakeout device with a filtering function for casting production and processing, and relates to the technical field of casting part shakeout devices, the casting part shakeout device comprises a fixing frame, a base and a vibration hopper, the top of the base is provided with a vibration mechanism, the top of the fixing frame is provided with a knocking mechanism, and one side of the vibration hopper is provided with a screen; the output end of the rotating motor can drive the rotating plate to rotate, the rotating plate can drive the knocking hammer to rotate anticlockwise around the hinge seat, so that the bottom end of the knocking hammer knocks the outer surface of a casting part, sandy soil blocks on the surface of the casting part are vibrated to be scattered, then the vibrating mechanism drives the vibrating hopper to vibrate, and the vibrating hopper can drive the casting part to vibrate. The vibrating hopper can drive the sandy soil to face the screen, and the screen plays a role in filtering the sandy soil, so that oxide skin mixed with the sandy soil in the casting process is separated out.
Owner:JINCHENG NUODA FOUNDRY CO LTD
Lightweight foamed sand based on low temperature tolerant microbial solidifier and method of making
The application discloses a kind of light foam sandy soil based on low-temperature resistant microbial curing agent and its preparation method, the light foam sandy soil includes solid matter and liquid matter, the mass ratio of solid matter and liquid matter is 3.5-6:1, the proportion of each substance in solid matter is 78-84wt% of sandy soil, 12-18wt% of composite activator, 4-6wt% of bacterial foam adsorbent, and the liquid matter is cementing solution.The preparation method includes the following steps: preparing low-temperature resistant microbial curing agent;The prepared low-temperature resistant microbial curing agent is mixed uniformly with sandy soil to obtain solid matter;The obtained solid matter is mixed uniformly with cementing solution, i.e. to obtain light foam sandy soil based on low-temperature resistant microbial curing agent.The technical scheme of the application significantly improves the survival rate and mineralization efficiency of the strain in low-temperature environment, and the light foam sandy soil prepared using the technical scheme has a lower mass per unit volume, higher compressive strength and higher permeability resistance.
Owner:JIANGXI UNIV OF SCI & TECH
Intermittent mud throwing method for construction of gravel and sand mixed by trailing suction dredger
PendingCN121451600AMechanical machines/dredgersHollow article cleaningShip safetyMechanical engineering
The invention relates to an intermittent mud throwing method for construction of gravel and sand-mixed soil by a trailing suction dredger. Comprising the following steps that S1, a drag suction dredger slows down to a designated position of a mud throwing area before reaching the designated mud throwing area, and after reaching the mud throwing area, a top wind flow is selected according to the wind flow condition to control the position of the dredger, and the speed of the dredger is reduced to zero; s2, the mud doors with odd numbers or even numbers are controlled to be slowly and synchronously opened, the opening stroke of the mud doors is controlled in the mud door opening process, multiple pauses are conducted in the initial stage of mud door opening, and when the working conditions that the cabin capacity is gradually reduced, the earthwork volume in the cabin is gradually reduced and the ship draft is also slowly reduced are observed, the mud doors are stopped; the mud doors are opened to a mud throwing state; and S3, other mud doors are slowly and synchronously opened, the opening stroke of the mud doors is controlled in the mud door opening process, multiple pauses are conducted in the initial stage of opening of the mud doors, and then the mud doors are opened to be in the mud throwing state. The ship body shaking and noise during mud throwing are relieved, the ship safety is guaranteed, and the impact loss is reduced.
Owner:CCCC TDC BINHAI ENVIRONMENTAL CHANNEL DREDGING
Method for evaluating pore pressure of saturated sand based on permeability of weak permeable interlayer
The invention belongs to the technical field of saturated sandy soil dynamic analysis, and particularly relates to a saturated sandy soil pore pressure evaluation method based on weak permeable interlayer permeability. Establishing a layered model composed of saturated sand and the weak permeable interlayer; selecting a dynamic constitutive model suitable for cyclic loading conditions; applying a self-weight load to the dynamic constitutive model to generate an initial stress field of the dynamic constitutive model; based on a finite difference theory, constructing a dynamic fluid-solid coupling analysis model of a saturated sand dynamic response control equation and a pore water seepage control equation; simulating pore water pressure response of the saturated sandy soil under different power working conditions; and quantitatively evaluating the influence of the permeability of the weakly permeable interlayer on the pore pressure accumulation, dissipation and liquefaction response of the saturated sand. According to the method, the dynamic numerical model considering the interlayer permeation difference is established, and the influence of the weakly permeable interlayer on the pore water pressure generation, diffusion and dissipation process is systematically analyzed, so that the pore pressure response of the saturated sand is accurately evaluated.
Owner:JIANGSU UNIV
Device for dewatering ground of sand layer
The application relates to a kind of precipitation devices for sand layer foundation, comprising well body, the well body sequentially comprises at least one standard section and one water passing section from top to bottom;Standard section includes second standard section steel cylinder and first standard section steel cylinder;Water passing section includes first water passing section steel cylinder, third water passing section steel cylinder and second water passing section steel cylinder arranged concentrically from outside to inside;First water passing section steel cylinder wall is provided with a plurality of water passing holes, first water passing section steel cylinder and third water passing section steel cylinder are filled with water filtering gravel, and water passing pipe is arranged between third water passing section steel cylinder and second water passing section steel cylinder.The above-mentioned precipitation device adopts standard section and water passing section to jointly form well body, forms supporting structure by steel cylinder, and water passing structure (water passing structure is composed of water passing hole, water filtering gravel and water passing pipe) is arranged in water passing section, which can ensure that groundwater can successfully enter the well body, and can also prevent hole collapse in sand layer with high water content.
Owner:CHINA FIRST METALLURGICAL GROUP
Sandy soil reinforcement stability evaluation method, device and equipment based on MICP and medium
PendingCN121409726AMaterial analysis using wave/particle radiationSolid waste managementScanning electron microscopeCalcium carbonate crystals
The invention provides an MICP-based sandy soil reinforcement stability evaluation method, device, equipment and medium, and relates to the technical field of soil reinforcement, and the method comprises the following steps: respectively adding an ammonium standard solution into sodium modified zeolite and alkalization modified fly ash to determine the ammonia nitrogen removal rate, and screening candidate mass ratios; on the basis of the candidate mass ratio, the sodium modified zeolite and the alkalized modified fly ash are doped into the standard sand columns correspondingly, the bacterial liquid and the cementing liquid are injected for an MICP reaction, and a solidified sand column is obtained; the dry density and the calcium carbonate generation amount of the multiple solidified sand columns are measured, an unconfined compressive strength experiment is conducted, and an unconfined compressive strength value is obtained; the distribution form of calcium carbonate crystals is observed through a scanning electron microscope for the multiple solidified sand columns, and gelling substances are analyzed through X-ray diffraction; and judging an unconfined compressive strength value based on a microscopic analysis result, and when the unconfined compressive strength value meets a sandy soil solidification threshold value, outputting a solidification grade and a sandy soil strength value to finish stability evaluation. The problem that sandy soil reinforcement is not stable is solved.
Owner:QINGDAO UNIV OF TECH
Method and device suitable for carbon dioxide pipeline leakage experiment test
PendingCN120831202ADetection of fluid at leakage pointMaterial strength using tensile/compressive forcesWater bathsEmergency rescue
The invention relates to the technical field of carbon dioxide pipeline conveying, in particular to a method and device suitable for a carbon dioxide pipeline leakage experiment test. Introducing carbon dioxide gas into the device, and scavenging the device; after the test pipeline, the temperature sensor, the pressure sensor and the safety protection device are checked again, the sand is loaded into the sand box; and performing a carbon dioxide pipeline leakage experiment test on the test pipeline. The device comprises a carbon dioxide gas cylinder, a three-way valve, a constant-temperature water bath storage tank and a sand box. The test pipeline is buried in the sand box, pressure and temperature parameters of the buried multiphase carbon dioxide pipeline in the leakage process are collected, controlled and the like, different leakage morphology characteristics and leakage opening area wall temperature changes are obtained, the leakage caliber, the leakage position and the like can be rapidly and qualitatively judged after a pipeline leakage accident happens, and the leakage detection accuracy is improved. And the follow-up emergency rescue work can be conveniently carried out.
Owner:PETROCHINA CO LTD