518 results about "Sandcrete" patented technology

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.

The invention discloses a high-impermeability curing agent for sandy soil and a preparation method, the high-impermeability curing agent comprises the following components by mass: 30-50 parts of a solid waste-based sulfur aluminum iron series cementing material; 10 to 30 parts of slag powder; 5-30 parts of ordinary Portland cement; 5-20 parts of desulfurized gypsum; and 1-10 parts of silica fume. A curing agent system further strengthens the hydration effect and the cementing performance of the cementing material, and a formed crystal-colloid composite hydration product system contributes to the stable and compact microstructure of the cured sandy soil, so that the impermeability and the mechanical property of the sandy soil can be greatly improved; the comprehensive application of solid waste raw materials such as desulfurized gypsum and mineral powder is realized, and the stacking cost of solid wastes and the influence on the environment are reduced.

The invention relates to the technical field of analysis methods of ground materials, and discloses a sand liquefaction characteristic test device and a test method thereof, the sand liquefaction characteristic test device comprises a vibration table, a box body, an inverted filter assembly, a detection assembly and an analysis assembly; the box body is connected with the vibration table, a water inlet and a water outlet are formed in the box body, a flow stabilizing chamber, an inverted filter layer and a sample layer for placing a saturated sand sample are sequentially arranged in the box body from bottom to top and are communicated, the water inlet is communicated with the flow stabilizing chamber, the water outlet is communicated with the top of the sample layer, and the inverted filter assembly is arranged in the inverted filter layer; the detection assembly comprises a first accelerometer and a pore water pressure gauge, and the detection assembly is electrically connected with the analysis assembly; water is injected into a saturated sand sample through a water inlet, underground water seepage and seepage failure are simulated, and then sand seismic liquefaction is simulated through a vibration table. According to the invention, seepage and seepage failure effects of an actual saturated sand stratum under the action of underground water can be considered, and the earthquake liquefaction phenomenon of sand can be simulated more truly.

The invention relates to the technical field of civil engineering, in particular to a pile-soil dynamic response simulation test method which comprises the following steps: acquiring a soil body parameter, a pile body parameter and a construction parameter of a target engineering site; establishing a pile-soil power system generalization model according to a preset similarity ratio, and respectively determining a soil body parameter of the sand soil stratum, a pile body parameter of the simulation pile, and a first power loading parameter and a second power loading parameter of a loading system; preparing a pile-soil system according to the soil body parameters of the sand soil stratum and the pile body parameters of the simulation pile, controlling the pile-soil system to carry out vibration pile sinking and vibration pile pulling based on the first power loading parameter and the second power loading parameter, and monitoring test data in the vibration pile sinking and vibration pile pulling process, and analyzing to obtain a pile-soil dynamic response simulation analysis result. Therefore, the problems of tedious work, high cost and difficulty in accurate description of research on the dynamic response rule between the pile and the soil are solved, and the dynamic response rule between the pile and the soil under different conditions can be efficiently and accurately simulated.

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.

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.

The invention discloses a mechanical and ground stress combined loading device based on an underground structural member and a loading method thereof, and relates to the technical field of explosion tests. The dynamic response problem of an existing underground structure under the coupling action of soil stress and explosive load is solved. The device comprises an explosive load applying system and a surrounding stress applying system. The explosion load applying system comprises a lifting mechanism, a guide rail, a drop hammer and a test model; the confining stress applying system applies horizontal confining pressure and vertical confining pressure to the test model; the lifting mechanism drives the drop hammer to realize lifting at different heights; the drop hammer applies a vertical uniformly-distributed explosion-like load to the test model; an enclosure structure is arranged at the top of the test model, and sandy soil is arranged in the enclosure structure; a cover plate is arranged at the top of the enclosure structure, a cushion layer is arranged on the cover plate, and a buffer is arranged on the cushion layer; strain gauges are arranged on the surface of the bottom of the test model; and pressure sensors are arranged in the sand dispersion layer and on the inner surface of the test structure model. The method is suitable for underground structure anti-explosion overall effect model test research.

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.

The invention relates to the technical field of photovoltaic supports, in particular to an angle-adjustable photovoltaic support which comprises a support seat, a rotating column is rotatably connected to the inner wall of the top of the support seat, a rotating base plate is fixedly connected to the top of the rotating column, and an angle adjusting mechanism is fixedly connected to the top of the rotating base plate. In view of the situation that a photovoltaic panel is installed in an area with a large sunshine contact area during field engineering, but when the photovoltaic panel is installed on soil or sandy soil under the condition that soil is soft during field operation, if cement is poured into the ground, the pressure on the ground is possibly increased, although the photovoltaic panel can be fixed better, the photovoltaic panel can be fixed more firmly, and the photovoltaic panel can be fixed more firmly. In the prior art, the angle adjustment needs to be manually performed, and multiple angles cannot be adjusted, so that the soil collapse is more likely to occur, meanwhile, the subsequent shoveling work of cement is more troublesome, equipment can be flushed down and damaged when water and soil loss occurs in rainy and snowy weather if the cement is directly mounted on the ground and is not fixed, and the angle adjustment needs to be manually performed in the prior art, and the multiple angles cannot be adjusted.

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.

The invention discloses a method for calculating the vertical bearing capacity of a steel pile in a sandy soil field, which is used for calculating numerical simulation on the vertical bearing capacity of the steel pile in the sandy soil field under the conditions of different pile lengths, cross section areas, cross section shapes and sandy soil compactness on the basis of numerical simulation and field load test results. The vertical bearing capacity of the section steel pile under the conditions of different section steel pile lengths, cross section areas, cross section shapes and sand compactness is obtained, and the pile side friction resistance and the pile end resistance are corrected according to the obtained vertical bearing capacity of the section steel pile; and according to the corrected pile side friction resistance and pile end resistance, the vertical compression resistance and pulling resistance ultimate bearing capacity of the steel pile in the sandy soil site is calculated. According to the method, the defects in the prior art are overcome, and the accuracy and applicability of calculating the vertical bearing capacity of the steel pile in the sandy soil site are high.

The invention discloses a construction method for a cast-in-situ bored pile in a collapsible loess stratum, and relates to the technical field of cast-in-situ pile construction.The construction method comprises the following steps that a construction site is cleaned and leveled; pile hole position coordinate points are determined through pile foundation positioning and in cooperation with survey lofting; a pile casing is placed through excavation and burying construction; configuring a drilling machine to be stable in position, and adjusting a drilling center point of the drilling machine based on the pile casing; carrying out rotary drilling to form a hole based on a hard soil layer; reverse circulation drilling and hole forming are carried out based on the sand soil stratum; primary hole cleaning treatment is carried out on the rotary excavating and reverse circulation drill holes which are checked to meet the indexes; manufacturing a reinforcement cage and lowering and positioning the reinforcement cage corresponding to the pile position; a guide pipe for concrete pouring is installed based on the pile hole; a gas lift reverse circulation slurry channel is constructed for secondary hole cleaning; configuring a guide pipe and pouring concrete to form a pile. The problem that in the prior art, safety and stability are not high when a pile is drilled in a collapsible loess stratum is solved.

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.

The invention relates to the technical field of high-temperature heat storage, in particular to a foundation structure for supporting a high-temperature fused salt storage tank. The foundation structure comprises a concrete foundation layer, a ceramsite layer, a foam glass layer, a calcium silicate layer and a sand cushion layer which are sequentially stacked upwards from the ground. The sand cushion layer is used for making contact with the tank bottom of the high-temperature fused salt storage tank, receiving heat from the tank bottom of the high-temperature fused salt storage tank and conducting the heat downwards. The calcium silicate layer can keep the temperature of the foam glass layer to be lower than the temperature-resistant upper limit value when receiving heat transferred from the sand cushion layer. According to the foundation structure, the heat loss of the foundation structure in the ground direction can be reduced while the cost is not obviously increased, meanwhile, differential settlement is avoided, and the foundation structure is suitable for molten salt materials with the use temperature reaching 650 DEG C or above.

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.

The invention belongs to the technical field of novel biological building materials, and particularly relates to a method for reinforcing sandy soil by utilizing cement hydration and biological cement bonding, which comprises the following steps: inoculating urease bacteria into a culture medium for culturing to obtain a bacteria solution; preparing a cementing liquid matched with the urease bacteria; portland cement and sand are evenly stirred and filled into a mold, and a sand column blank is obtained; and spraying the bacterial liquid and the cementing liquid from the top of the sand column blank in turn to carry out a microbial mineralization reaction so as to obtain the molded sand column. According to the invention, the hydration effect of Portland cement is cooperated with biological cement to fully fill gaps of sand grains, so that a high-strength composite cementing system is formed. According to the method, the compressive strength of the sandy soil is remarkably improved, particularly, the defect that the strength of the sandy soil subjected to cementation treatment through a single biological grouting method is insufficient can be overcome, powerful guarantee is provided for safety and stability in the fields of foundation reinforcement, structural defect repair and the like, and remarkable academic innovation and engineering application value are achieved.

The invention discloses a capillary drainage gravel pipe pile for a collapsible aeolian sand foundation in a Sagomei district and a construction method, the capillary drainage gravel pipe pile comprises a porous pipe pile buried in sandy soil, micropores are uniformly formed in the porous pipe pile, gravel is filled outside the porous pipe pile to form a hollow gravel pile, and the hollow gravel pile is filled with water. A capillary drainage permeable pipe is arranged in the porous pipe pile; the construction method comprises the following steps that a construction area is cleaned, the vibroflot is hoisted through a crane to sink into a soil layer, then the outer-layer steel sleeve is installed outside the vibroflot and sinks into a preset depth together with the vibroflot, the porous pipe pile is installed inside the outer-layer steel sleeve, the space between the porous pipe pile and the outer-layer steel sleeve is filled with gravel, and a hollow gravel pile is formed; and meanwhile, the vibroflot is lifted, then water is injected and pumped into the porous pipe pile, the foundation is pre-settled, and finally the capillary drainage permeable pipe is installed in the porous pipe pile. The method can reduce the later settlement of the foundation, improve the construction quality, improve the bearing capacity of the foundation and enhance the anti-seismic property of the foundation.

The invention discloses a self-repairing high-strength and high-durability geotextile filling bag and a preparation method. The self-repairing high-strength and high-durability geotextile filling bag comprises a filling bag body, sewing threads and filling cuffs. The filling bag body is formed by sewing self-repairing high-strength and high-durability geotechnical cloth through sewing threads; the self-repairing high-strength high-durability geotechnical cloth comprises first geotechnical cloth or second geotechnical cloth, when the first geotechnical cloth is used for filling a soil body which is fine-grained soil and needs to be subjected to field hydraulic reclamation, the second geotechnical cloth is used for filling the soil body which is coarse sand, and when the first geotechnical cloth is subjected to field hydraulic reclamation or factory dry sand filling; the fine-grained soil is soil with the particle size being smaller than or equal to 0.075 mm, and the coarse sand is soil with the particle size being 0.075-2 mm; the first geotechnical cloth is composed of a filtering function layer and a high-strength wear-resistant layer which are sequentially arranged from bottom to top, and after the filling bag body is formed through sewing, the filtering function layer is located on the inner side of the filling bag body; the second geotechnical cloth is composed of a warp-knitted high-strength geotechnical cloth body, a spacer yarn layer and a warp-knitted high-strength geotechnical cloth body which are sequentially arranged from bottom to top, and after the filling bag body is formed through sewing, the warp-knitted high-strength geotechnical cloth body is located on the inner side of the filling bag body.

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.

The invention discloses a method for consolidating sandy soil by combining curdlan with an MICP technology, which comprises the following steps of: (1) customizing a PVC (Polyvinyl Chloride) cylinder of which the top is opened and the bottom is sealed, the inner diameter is 36.5 mm, and the height is 120mm; a 200 [mu] L pipette head is inserted into the bottom to serve as a sample adding channel, and two layers of medical gauze are cushioned at the bottom of the mold. The method comprises the following steps: weighing 140g of standard sand sieved by a 60-mesh sieve, fully and uniformly mixing the standard sand with curdlan with corresponding mass concentration, and filling the mixture into a mold to prepare a sand column sample with the height of 80mm; the method comprises the following steps: centrifuging a bacillus pasteurii bacterial liquid cultured for 14 hours at 6000 r for 5 minutes, discarding supernatant, adding a proper amount of fresh NB-Urea culture medium, and fully shaking up to prepare a bacterial liquid resuspension with OD of 1; (2) respectively connecting a peristaltic pump with a sample adding port and a beaker, injecting sterile water, and standing at 30 DEG C for 24 hours to saturate the sample; after saturation is completed, bacterial liquid is injected, standing is conducted for 4 h, then prepared cementing liquid (1M urea and CaCl2. 2H2O mixed liquid) is injected, one round of grouting is conducted, and 14 rounds of grouting are conducted in total.

The invention relates to a novel discrete element method for simulating infiltration sand particle loss, which comprises the following steps: comparing particle stress with an average stress mean value of all particles in a sample, and when the particle stress # imgabs0 # is smaller than the average stress mean value # imgabs1 # of all the particles, determining that the particles belong to infiltration loss particles; carrying out loss priority ranking on all particles which can be subjected to infiltration loss; and a particle removal algorithm is constructed. The method has the beneficial effects that fine particles which can be subjected to permeation and erosion loss are judged and distinguished through pure discrete element simulation, whether permeation and erosion can be carried out or not is judged by comparing the particle stress size with a mean value, the particle loss is controlled in the fine particles, and errors caused by loss of a soil skeleton are avoided; and the lossable particles are sorted according to priorities to determine the sequence of the removed fine particles in each cycle, so that the loss of the permeable sand particles simulated by the discrete element method is more in line with the real situation.

The embodiment of the invention provides a test device and method for simulating ocean coarse-grained soil deposition, and the device is characterized in that a lifting platform can ascend and descend along a main body of a supporting part; the sand discharging box can move back and forth on the main body of the supporting component in the horizontal direction along with the back-and-forth platform, namely, the device can adjust the sand discharging height and the horizontal moving speed, coarse-grained soil can be evenly scattered to the simulation bin through sand discharging in the horizontal direction, and the situation that sand is accumulated in a local area, and consequently the density distribution of a sedimentary layer is uneven is effectively avoided.

The invention discloses a cover-excavation top-down station side wall top-down construction joint retention method, which is used for a floor mold retention method and comprises the following steps: excavating a structural plate and a side wall in advance to form a structural outline, reserving reinforcing steel bars in the side wall, backfilling sandy soil at the excavation position of the side wall, and pouring a concrete leveling layer within the range of the structural plate. An isolating layer is arranged on the concrete leveling layer, and structural slabs and side walls are poured synchronously to form structural concrete; and after the structural concrete meets the design strength requirement, excavating the earthwork below the structural concrete, removing the concrete leveling layer, manually chiseling the construction joint, and pouring the side wall concrete below the construction joint through the pouring gate. The invention relates to the technical field of building construction, and can solve the problem that in the prior art, a construction joint of a side wall of a cover-excavation top-down station has a leakage risk.

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.

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.

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.

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.

The invention relates to the technical field of civil engineering, in particular to a method for paving a temporary traffic road of a sand foundation based on a high-strength polyethylene material. According to the method, static pressure is applied to the sand foundation through a vibratory roller, then vibratory compaction is conducted, steel pipes are driven into the sand foundation for reinforcement, flatness measurement is conducted on the surface of the sand foundation through a measuring instrument, trimming is conducted through a land leveler, and an appropriate cross slope and an appropriate longitudinal slope are arranged according to the road design requirement; then high-strength polyethylene plates are laid on the surface of the sand foundation; the polyethylene plate prepared by the invention not only has better mechanical properties, but also has excellent wear resistance and illumination resistance, and the quality of the polyethylene plate is effectively ensured; the method for paving the temporary traffic road of the sand foundation based on the high-strength polyethylene material is used for paving the temporary road and has a wider market prospect.

The trestle structure of the underwater suction pile foundation of the subsea pipeline comprises a trestle mechanism, penetration structures are arranged on the two sides of the trestle mechanism, at least one penetration structure is arranged to be a suction pile, and a negative pressure generator is arranged in the suction pile. By means of the trestle structure, pipelines can be fully protected, closed protection and open supporting exist, workers can conveniently conduct various selections, and the trestle structure has the advantages of being short in construction period, low in construction difficulty, wide in application range and the like. The design structure can effectively bear huge horizontal and vertical loads and bending moment. Besides, the suction pile foundation further has multiple remarkable advantages such as investment cost saving, foundation installation period shortening and reutilization, the overall penetration depth can be adjusted by adjusting the internal negative pressure generator, and the suction pile foundation is suitable for various geological units and geological types such as covering sludge, clay, silt and sandy soil.

The utility model relates to a sand treatment device for nodular cast iron casting, which belongs to the technical field of sand treatment and comprises a treatment box, the bottom end of the inner wall of the treatment box is fixedly connected with a blanking box, the outer side of the treatment box is fixedly connected with an L-shaped conveying pipe, the inside of the L-shaped conveying pipe is rotatably connected with a conveying auger, and the L-shaped conveying pipe is fixedly connected with the blanking box. A pushing plate is slidably connected to the interior of the discharging box. The sand screening device has the beneficial effects that sand and impurities fall into the discharging box after being screened, a piston rod of an electric telescopic rod stretches out, a pushing plate can be pushed to slide, and then the sand in the discharging box can be pushed into an L-shaped conveying pipe, so that the sand at the bottom end can be driven to ascend through rotation of a conveying auger, and the sand is conveyed to the discharging box; and the sandy soil can be conveyed into the treatment box again through the discharging plate for secondary screening work, so that the secondary feeding efficiency of the sandy soil can be improved, and the sandy soil screening effect is better.