75 results about "Coral sand" patented technology

The invention relates to a coral sand soil multi-dimensional ecological low-carbon reinforcement method which comprises the following steps: S1, a urease solution is sprayed on a coral sand single-particle soil layer, a cementing liquid A is sprayed after standing, the urease solution is extracted from legume plants, and the cementing liquid A is obtained by mixing a urea solution and a calcium chloride solution; s2, on the basis of treatment in the step S1, a sporosarcina pasteurii bacterial solution is firstly sprayed, after standing, a cementing solution B is sprayed, the cementing solution B is alternately and circularly sprayed for multiple times, and the cementing solution B is obtained by mixing a urea solution and a calcium chloride solution; s3, a 3D printing geosynthetic material is laid on the basis treated in the step S2; and S4, laying a coral sand single-particle soil layer on the basis of treatment in the step S3, and repeating the steps S1 to S3. According to the method, a single particle size-foundation unit size-engineering size reinforcing system is constructed, comprehensive reinforcing from a microscopic single particle to a macrostructure can be achieved, and the reinforcing effect and efficiency are effectively improved.

The invention provides a salt-tolerant plant constructed wetland system for treating eutrophicated mariculture wastewater, which specifically comprises a lower filler formed by mineral materials, and a middle filler formed by modified zeolite, sodium alginate coated vermiculite, rice husk charcoal, oyster shell, coral sand and diatomite, the surface filler is composed of intertidal zone bottom mud, intertidal zone raw water, coastal saline-alkali soil and composite algae powder, and the three fillers are combined with salt-tolerant plant breeding, bow-shaped water flow optimization and layered collaborative design; the core problems of poor salt tolerance, low adsorption efficiency, easiness in blockage, high maintenance cost and the like of the traditional constructed wetland during treatment of the mariculture wastewater are systematically solved.

The invention discloses scouring protection and seaweed restoration integrated ecological solidified soil and a preparation method thereof, and belongs to the technical field of ocean engineering and ecological restoration. The material is prepared from the following components in parts by weight: 800 to 1000 parts of sea mud, 200 to 400 parts of calcined coral sand, 50 to 150 parts of a modified chitosan gelling agent, 100 to 200 parts of a silicate geopolymer, 100 to 250 parts of slow-release nutritional ceramsite, 50 to 120 parts of seaweed seeds, 80 to 160 parts of a seawater activating agent and 20 to 50 parts of a microbial carrier loaded with saline-alkaline tolerant bacteria. The material has the characteristics of underwater dispersion resistance and self-leveling, can resist scouring at the flow speed of 2.5 m / s, and realizes that the 30-day accumulative germination rate of sea grass is greater than or equal to 80%. The method breaks through the bottleneck of function splitting of traditional material engineering protection and ecological restoration, synchronously completes scouring protection and seaweed community reconstruction, and is suitable for ocean engineering scouring protection and seaweed ecological restoration engineering.

The utility model discloses a coral sand particle size and shape double sorting device which comprises a plurality of sorting systems, a sorting system fixing support and a screening machine, and the sorting systems comprise a particle size sorting system, a flaky particle sorting system and a block-shaped and rod-shaped particle sorting system which are sequentially connected from top to bottom. The screening machine is compatible with an existing standard inspection screening machine and is simple in structure, complex mechanical equipment does not need to be introduced on the basis that a traditional particle size sorting function is reserved, the screen is customized according to needs during use, and the equipment transformation cost is remarkably reduced; the device disclosed by the utility model can be used for simultaneously screening various sample particles in different target particle size ranges and respectively screening the sample particles in different target particle size ranges in a sheet shape, a block shape and a rod shape.

The invention discloses a coral sand particle size and shape double sorting device which comprises a plurality of sorting systems, a sorting system fixing support and a screening machine, and the sorting systems comprise a particle size sorting system, a flaky particle sorting system and a block-shaped and rod-shaped particle sorting system which are sequentially connected from top to bottom. The screening machine is compatible with an existing standard inspection screening machine and is simple in structure, complex mechanical equipment does not need to be introduced on the basis that a traditional particle size sorting function is reserved, the screen is customized according to needs during use, and the equipment transformation cost is remarkably reduced; the invention further discloses a coral sand particle size and shape dual screening method, the device can simultaneously screen sample particles in different target particle size ranges, the sample particles in the different target particle size ranges are screened in a sheet shape, a block shape and a rod shape, and the particle size and shape of the coral sand particles can be screened through optimized screening parameters. And the phenomena of sieve leakage and sieve mixing are effectively avoided.

The invention relates to a coral sand modification method based on calcium-based solid waste carbonization. Comprising the steps that coral sand with the particle size ranging from 0 mm to 4.75 mm is placed in a reaction kettle, and vacuumizing is conducted to enable the coral sand to be in a negative pressure environment; the method comprises the following steps: mixing calcium-based solid waste micro-powder with the particle size distribution of 0-75 microns and carbonization activity with seawater, performing ultrasonic stirring to form uniform calcium-rich turbid liquid, and adjusting the alkalinity of the calcium-based turbid liquid; pouring the calcium-rich turbid liquid into the kettle under the action of negative pressure, introducing CO2 into the kettle when the turbid liquid submerges the coral sand, and discharging the calcium-based turbid liquid after curing for a preset time; and repeating for multiple times, ending carbonization curing, taking out, and drying in a drying box to obtain the modified coral sand. According to the method, the flue gas, the calcium-based solid waste and the like can be subjected to resource utilization; the operation process is simple, the raw materials are obtained locally, and the crushing strength of the modified coral sand is obviously improved.

The application discloses high-performance light soil adopting fine coral sand and a preparation method thereof. The light soil comprises the following components in parts by weight: 100-400 parts of fine coral sand, 10-50 parts of cement, 20-100 parts of seawater and 0-5 parts of additive agent. The fine coral sand is micron-level powder obtained by crushing and grinding of coral sand, has a particle size distribution of 10-300 microns and a specific surface area of 400-600 m2 / kg. The cement content is calculated according to 10%-20% of the mass of the fine coral sand. The additive agent comprises a water reducing agent and a stabilizer. The preparation method comprises fine grinding of the coral sand, preparation and pretreatment of raw materials, dry material premixing and activation, air bubble group preparation, mixing and stirring, and pouring and curing. The application realizes synergistic enhancement of hydration reaction and micro-filling, effectively improves the mechanical properties and durability of the light soil, promotes the transformation of island reef engineering construction to green environmental protection and resource utilization, realizes resource utilization of the coral sand and provides a new way for reducing engineering cost.

The present application relates to the field of building technology, and more particularly to a method for reinforcing coral sand based on MICP-coconut shell fiber, which is suitable for reinforcing the foundation of coral sand in tropical marine island reef engineering and the like. The present application aims to overcome the shortcomings of the existing coral sand reinforcement technology and provide a method for ecologically and low-carbon reinforcing of coral sand based on MICP-coconut shell fiber. By constructing a synergistic system of "fiber skeleton-microbial mineralization-sand body cementation", the ecological, low-carbon and efficient reinforcement of the foundation of coral sand is achieved, and the strength, toughness, uniformity and ecological compatibility of the foundation are simultaneously improved.

The application discloses a pile-forming process of a drainage rigid pile in a drainage anti-liquefaction coral sand foundation, which comprises a base forming box, a base pile pouring device and a drainage rigid pile forming device. The base forming box, the base pile pouring device and the drainage rigid pile forming device are arranged. The base pile pouring device is provided with a connecting and fixing mechanism at the bottom of the outer side. The connecting and fixing mechanism is quickly connected and fixed with the base forming box. The base pile pouring device is provided with a water pumping pipe assembly inside to pump water in the base forming box. The pouring pipe of the base pile pouring device is used to pour concrete into the base forming box, so that the base forming box forms a concrete base. The drainage rigid pile forming device is connected with the base forming box of the poured and formed concrete base. The drainage rigid pile is poured and formed in the drainage rigid pile forming device. The pouring convenience of the drainage rigid pile is improved. The stability of the base pile of the drainage rigid pile is improved. The strength of the drainage rigid pile is improved.

The invention discloses a preparation method of a coral sand soil water-retaining agent based on sludge, and belongs to the technical field of materials. The preparation method of the sludge-based coral sand soil water-retaining agent is characterized in that sodium carboxymethyl cellulose and sludge are taken as raw materials for cross-linking modification, and the preparation method specifically comprises the following steps: putting the sodium carboxymethyl cellulose into an alkaline solution to obtain a sodium carboxymethyl cellulose solution; mixing the sodium carboxymethyl cellulose solution with sludge to obtain a sodium carboxymethyl cellulose and sludge mixed solution; and adding a cross-linking agent into the sodium carboxymethyl cellulose sludge mixed solution, and carrying out a cross-linking reaction to complete the preparation. According to the sludge-based water-retaining agent disclosed by the invention, sodium carboxymethyl cellulose is used as a framework, and sludge particles are loaded on the sodium carboxymethyl cellulose to form a three-dimensional network structure. The sludge-based water-retaining agent retains a microporous structure formed by crosslinking of carboxymethyl cellulose, moisture can be fully absorbed, and meanwhile, the pore structure of a three-dimensional network structure is enhanced by adding sludge.

The present invention provides a fully solid waste environmentally friendly road structure containing a steel slag wearing layer and a construction method thereof, belonging to the technical field of road engineering. Coral sand is used to pave a precipitate absorption layer on the roadbed, and modified red mud or modified phosphogypsum is used to fill the roadbed in layers on top of the precipitate absorption layer. Under the condition that the bearing capacity requirements are met, an asphalt structure combination layer of a certain thickness is directly paved on the roadbed, and the anti-skid wear layer in the asphalt structure combination layer is paved with steel slag aggregate instead of part of the stone. The pavement structure has a simple construction process and low cost, and can avoid soil and groundwater pollution caused by the infiltration of residual harmful substances in red mud or phosphogypsum solid waste, while realizing large-scale road use and high-value utilization of materials such as steel slag, red mud, phosphogypsum, and coral sand.

The invention relates to the field of ecological fresh water promotion, and particularly discloses a habitat plaque configuration method for reducing tropical coral island water loss, which comprises the following steps: selecting tropical coral island suitable plant species, and planting and maintaining according to different habitat plaque configuration schemes by taking coral sand as a planting substrate; simulating different wind speed modes by using a wind tunnel experiment device, tracking and observing the wind field, the windproof effect and the moisture evaporation characteristic in the forest network under different configuration schemes, and obtaining observation data; and analyzing and comparing observation data, and screening out a target vegetation configuration mode capable of reducing water loss at the maximum efficiency under different wind speed modes. By quantitatively evaluating the regulation and control effects of different vegetation structures on the wind field and water evaporation, the cost of forming fresh water in the tropical coral island can be reduced, habitat plaque configuration is performed purposefully, water loss of the tropical coral island is reduced, efficient water utilization is realized, and the method is suitable for large-scale popularization and application. And scientific and efficient technical support is provided for water resource protection and ecological construction of tropical coral islands.

This invention discloses a method, device, and storage medium for calculating the bearing capacity of a coral sand-gravel pile composite foundation. The calculation method includes: determining the initial void ratio, minimum void ratio, unit weight, internal friction angle, crushing energy dissipation coefficient, and internal friction angle of the original coral sand; calculating the lateral ultimate stress of the coral sand by introducing a crushing energy dissipation correction term; calculating the ultimate bearing capacity of a single pile according to the bulging limit equilibrium formula; analyzing the bearing capacity characteristic values ​​of the foundation design load and layout scheme, and adjusting the gravel pile reinforcement parameters or layout scheme; this calculation method quantifies the "particle crushing effect" of coral sand and introduces a crushing energy dissipation correction term to achieve coupled correction of the bulging balance calculation formula; field load tests show that the bearing capacity of the corrected composite foundation is reduced to less than 5%, significantly reducing the calculation error of the traditional formula, and is suitable for rapid evaluation and design optimization of the bearing capacity of coral sand vibratory compaction gravel pile composite foundations.

The present invention discloses a method for constructing a revetment structure using a double-layer mold bag. A wave barrier is provided at the top of the bank slope, a recessed area is excavated at the bottom of the bank slope, and a double-layer mold bag is laid on the bank slope. The double-layer mold bag has two filling chambers, an upper layer and a lower layer. The lower layer filling chamber is filled with coral mortar, and the upper layer filling chamber is filled with coral sand concrete. This double-layer filling chamber mold bag structure can ensure high strength of the revetment surface because its upper filling chamber is filled with coral sand concrete. In addition, because its lower filling chamber is only filled with coral mortar, it can save a large amount of concrete compared to existing mold bags with a single-layer filling space, fully utilizing the abundant local coral sand resources on the coast, lowering costs, and facilitating construction.

The invention discloses an early-strength, quick-setting concrete for emergency repair and construction of island and reef projects and a preparation method thereof. The method comprises weighing artificial seawater, sulphoaluminate cement, fly ash, silica fume, coral sand, regenerated coral coarse aggregate, a water reducer, a liquid alkali-free quick-setting agent and stainless steel fiber, uniformly mixing the sulphoaluminate cement, silica fume and fly ash to obtain a cementitious material, reserving a portion of artificial seawater, dry-stirring the cementitious material, then adding the remaining artificial seawater and the water reducer and stirring, then respectively adding coral sand, regenerated coral coarse aggregate and stainless steel fiber and stirring, adding the liquid alkali-free quick-setting agent and the reserved artificial seawater to the resulting mixture to obtain a concrete mixture in a gel state, placing the mixture into a mold for vibration, standing, demoulding and curing to obtain early-strength, quick-setting concrete. The early-strength, quick-setting concrete of the present invention has the advantages of short setting time, good early strength, high mechanical strength and stable chemical properties, and has good economic and environmental effects.

The invention discloses a method for improving high temperature resistance of an engineering cement-based composite material, and belongs to the technical field of cement-based composite materials. The coral sand powder is used for replacing quartz powder in the engineering cement-based composite material at the volume replacement rate of 0-50%, a proper amount of the coral sand powder is used for replacing the quartz powder in the engineering cement-based composite material, the binding force of an interface transition zone (ITZ) is improved due to the introduction of the coral sand powder, the comprehensive performance of the engineering cement-based composite material is effectively improved, and the engineering cement-based composite material is suitable for being used as an engineering cement-based composite material. Particularly, the material shows relatively good mechanical properties in a high-temperature environment. Moreover, when the replacement rate of the coral sand powder is 25%, the fluidity of the engineering cement-based composite material is good, the residual compressive strength and the axial tensile property are most excellent, and the compressive strength after exposure at 400 DEG C is 60.6 MPa.

The preparation method comprises the following steps: weighing artificial seawater, sulphoaluminate cement, fly ash, silica fume, coral sand, regenerated coral coarse aggregate, a water reducing agent, a liquid alkali-free accelerator and stainless steel fibers, uniformly mixing the sulphoaluminate cement, the silica fume and the fly ash, and uniformly stirring to obtain a mixture; a part of artificial seawater is reserved, the gelling material is subjected to dry stirring, then the remaining artificial seawater and a water reducing agent are added and stirred, coral sand, regenerated coral coarse aggregate and stainless steel fibers are added and stirred, a liquid alkali-free accelerator and the reserved artificial seawater are added into the obtained mixture, and the mixture is uniformly stirred. And putting the gel-state concrete mixture into a mold, vibrating, standing, demolding and curing to obtain the early-strength quick-setting concrete. The early-strength quick-setting concrete has the advantages of short setting time, good early strength, high mechanical strength, stable chemical properties and the like, and has good economic and environment-friendly effects.

The invention discloses a coral sand gravel pile composite foundation bearing capacity calculation method and device and a storage medium. The calculation method comprises the steps that the initial void ratio, the minimum void ratio, the weight, the internal friction angle, the crushing energy consumption coefficient and the stone internal friction angle of original coral sand are measured; a crushing energy consumption correction term is introduced to calculate lateral limit stress of the coral sand; calculating the ultimate bearing capacity of the single pile according to an expansion ultimate balance formula; analyzing a foundation design load and an arrangement scheme bearing capacity characteristic value, and adjusting a gravel pile reinforcement parameter or an arrangement scheme; according to the calculation method, the particle crushing effect of coral sand is quantified, and a crushing energy consumption correction term is introduced to realize coupling correction of a ballooning balance calculation formula; a field load test shows that the bearing capacity of the corrected composite foundation is reduced to be within 5%, the calculation error of a traditional formula is greatly reduced, and the method is suitable for rapid evaluation and design optimization of the bearing capacity of the coral sand vibro-replacement gravel pile composite foundation.

The application discloses a flexible shaft well structure with anti-seismic and anti-seepage functions and a construction method thereof, and belongs to the field of building construction. The flexible shaft well structure comprises a reinforced concrete lining and a load-bearing ring arranged outside the reinforced concrete lining, the load-bearing ring is formed by circumferentially overlapping a plurality of flexible piles around the reinforced concrete lining, the flexible piles are formed by consolidating a permeable polymer and sand, and a polymer waterproof shock insulation buffer layer is arranged between the reinforced concrete lining and the load-bearing ring, and the polymer waterproof shock insulation buffer layer is formed by expanding a polymer grouting layer. The shaft well structure has high anti-seismic and anti-seepage performances, and is suitable for a coastal coral sand reclamation layer. A flexible load-bearing ring with anti-seismic and anti-seepage functions is formed by polymer permeation grouting, a polymer waterproof shock insulation buffer layer is formed by grouting between the reinforced concrete lining structure and the load-bearing ring, and the whole structure has anti-seismic and anti-seepage effects. In the excavation process, complicated dewatering operations are not needed, and a large amount of financial resources and time are saved.

The present invention provides a construction method for suction drilling in coral sand. The method comprises a steerable metal tube with a smooth outer wall, a suction drill bit embedded in the head of the steerable metal tube; a fixed slot is provided on the inner wall of the steerable metal tube; a rotatable slot is hingedly connected to the inner wall of the steerable metal tube and located above the fixed slot; the upper surface of the fixed slot and the lower surface of the rotatable slot are provided with arc slide rails; and the upper portion of the rotatable slot is connected to a hydraulic telescopic shaft. This method avoids the high construction costs of drilling with traditional drilling rigs, meets construction requirements with minimal costs, is energy-efficient and environmentally friendly, and is a fast, low-cost, steerable coral sand drilling technology.

This invention provides a self-triggered reinforcement structure and method for coral sand foundations under seismic loading. The structure includes a shell, a core, an induction excitation system, an oil-secreting module, and a pressure spraying system. The core is located inside the shell cavity and a weak magnet is fixed on it. The induction excitation system includes a MEMS accelerometer chip, a Hall effect chip, and an iron core. A coil is mounted on the iron core. The MEMS accelerometer chip and the Hall effect chip are used to monitor the seismic magnetic effect and acceleration variations. When the seismic magnetic effect occurs and the acceleration exceeds a threshold, the coil and the iron core become electromagnets with the same polarity as the weak magnet, and the core is inserted into the soil for reinforcement. The oil-secreting module is used to reduce the friction between the core and the shell, and the pressure spraying system is used to cause the reinforcement grout inside the shell to overflow for reinforcement. This invention can monitor the dynamic load state in real time. Through the self-triggered core structure in the pressure spraying system and induction excitation system, the surrounding soil of the reinforced structure is actively grouted and reinforced to form a vertical reinforcement structure.

The invention discloses durable coral mortar which is prepared from the following raw materials in parts by weight: 900-1100 parts of coral sand; 405 to 495 parts of LC3 cement; 3.888 to 4.752 parts of a water reducing agent; and 202.5 to 247.5 parts of water. The mortar has good mechanical properties and can effectively resist seawater erosion, and the preparation method of the mortar is energy-saving and environment-friendly.

The invention discloses an environment-friendly loose and solid composite pile system for treating a coral sand roadbed and a construction method.The system comprises a gravel layer, a medium sand drainage layer, a bearing platform, composite piles and a conductive drainage plate, the medium sand drainage layer is laid on the periphery of the bearing platform, and the height of the upper surface of the medium sand drainage layer is flush with that of the bearing platform; a gravel layer is laid on the surface of the bearing platform and the surface of the medium sand drainage layer, the bottom face of the bearing platform is fixedly connected with a composite pile, the composite pile comprises a discrete pile and a rigid core pile, the rigid core pile is arranged in the middle of the discrete pile, a plurality of conductive drainage plates are inserted into the periphery of the composite pile, and the conductive drainage plates are laid below the medium sand drainage layer. The scattered and solid composite pile system has high adaptability and can be flexibly adjusted according to different geological conditions and construction requirements. And the bearing capacity, the stability, the drainage performance and the anti-liquefaction effect of the coral sand foundation are remarkably improved.

The application provides an expansion pile foundation structure on coral sand and a construction method, a prefabricated pile body is composed of a plurality of separated small piles; a middle part of the prefabricated pile body is provided with a hollow structure, the hollow structure is used for inserting a pile pressing iron rod and an internal support structure into the hollow structure when the prefabricated pile body is driven into the coral sand; after the internal support structure is inserted into the hollow structure, a reserved space is formed between the outer wall of the internal support structure and the inner wall of the hollow structure; and grouting is carried out in the reserved space. The pile foundation structure is simple in operation and convenient to implement experiments, can reach the construction standard, can effectively solve the settlement problem of the pile foundation on the coral sand foundation, is beneficial to the stability of the upper structure of the pile foundation, and ensures the safe construction of the upper building.

The application discloses a kind of farmland repair safe utilization methods, including farmland repair and farmland safe utilization, specifically are as follows: (1) soil acidification conditioning: the contaminated farmland is ploughed, according to 800-1400kg / mu is applied organic fertilizer, then in the soil in agricultural product sowing before acidification conditioning agent is scattered, scattering amount is 1000-2000kg / hm 2 ; (2) micro-fertilizer regulation: during the growth period of agricultural products, microelement fertilizer is applied; (3) water regulation technology: during the key period of agricultural product growth, water regulation measures are adopted to maintain appropriate moisture in the soil; the acidification conditioning agent comprises 15-25 parts of humic acid, 4-10 parts of montmorillonite and 30-50 parts of modified coral sand. The application effectively realizes the effective repair and safe use of the contaminated farmland through the improvement of soil acidification conditioning and micro-fertilizer regulation.

The invention relates to the technical field of cement production, in particular to a method for preparing a low-carbon cement-based material from coral sand and metakaolin, which comprises the following steps: S1, raw material preparation: preparing the following dry basis components in parts by weight: 30-60 parts of ordinary Portland cement, 80-120 parts of coral sand, 10-30 parts of metakaolin, 25-40 parts of water and 0.3-1.5 parts of water reducing agent; s2, dry mixing: putting the ordinary Portland cement, the coral sand and the metakaolin weighed in the step S1 into a stirrer, and rotating and stirring for 3-5 minutes at a low speed until the solid powder and the particles are uniformly mixed, so as to obtain a dry mixture with uniform appearance and color. According to the method for preparing the low-carbon cement-based material from the coral sand and the metakaolin, industrial waste residues such as fly ash and slag with obvious regional distribution characteristics are not used as main raw materials, and the problem that an existing substitution technology is difficult to popularize due to insufficient admixture supply and high transportation cost is effectively solved. And the method is particularly suitable for engineering construction in special scenes such as ocean islands and resource-deficient areas.

This utility model discloses a revetment structure using coral sand combined with geocell construction. An internally constructed geocell-type geotextile bag is laid on the bank slope, and the interior of the geocell-type geotextile bag is filled with coral sand. The internally constructed geocell-type geotextile bag includes a bag body, transverse reinforcing bars, longitudinal reinforcing bars, vertical reinforcing bars, and geocells. The bag body is bag-shaped, including a top surface, a bottom surface, and four side covers. Transverse and longitudinal reinforcing bars are evenly spaced on the top surface of the bag body, forming a grid array. Transverse and longitudinal reinforcing bars are also evenly spaced on the bottom surface of the bag body, forming a grid array. The vertical reinforcing bars connect the intersections of the grid arrays on the top and bottom surfaces of the bag body. The geocells are located inside the bag body, allowing the filled coral sand to remain stably within the internally constructed geocell-type geotextile bag, forming a stable revetment structure.

The invention provides a brick making device utilizing microorganisms to solidify coral reef sand, and relates to the technical field of microorganism brick making, the brick making device comprises a track moving base, a material accumulating and conveying assembly and a crushing and grinding assembly, and a base mounting upper base plate is fixedly mounted on the surface of the upper end of the track moving base; the material accumulating and conveying assembly is fixedly mounted on the surface of the upper end of the base mounting upper base plate, machining supporting columns are fixedly mounted at the four corners of the surface of the upper end of the base mounting upper base plate, and the crushing and grinding assembly is fixedly mounted at the upper ends of the machining supporting columns. Coral mined in a seaside shallow sea area is directly conveyed into the crushing and grinding assembly through the coral conveying belt and then passes through the sand transfer curing box in butt joint with the reef sand conveying belt, a power source is connected, and the driving motor drives the material accumulating and conveying assembly and is in linkage with the crushing and grinding assembly to process coral raw materials; and coral reef sand is conveyed into the sand transfer curing box through the reef sand conveying belt to support the sand bricks, and convenience and rapidness are achieved.

The application discloses a kind of concrete slurry of underwater 3D printing, belong to building material technical field, the slurry includes main material, auxiliary material and recycled material, by weight fraction, the main material is composed of 100-120 parts of cement, 15-30 parts of silica ash, 10-15 parts of coral sand, 8-12 parts of quartz sand, 35-40 parts of water;The auxiliary material is composed of water reducing agent 1-2.5 parts, anti-dispersion agent 1-1.5 parts, cellulose 0.5-1 part, plant glue 0.8-1.5 parts;The recycled material is marine recycled plastic body, including polyethylene terephthalate and / or polystyrene and / or polypropylene and / or polyethylene 20-35 parts.The underwater 3D printing concrete slurry of the application can meet the liquidity when printing, also has the requirement of meeting anti-dispersibility, and the marine garbage recycling material is combined with the substance applied, can consume such substances without affecting the practicability of the product of the application, help environmental protection.

The utility model is suitable for the technical field of sand foundation packing-free vibroflotation tests, and provides a packing-free vibroflotation test device in foundation treatment in coastal sand areas, which comprises a crawler used for driving the vibroflotation test device to move; the steel frame is mounted on the crawler; the hoisting machine is mounted on the crawler; the guide wheels are mounted on the steel frame; the steel wire rope is arranged on the hoisting machine and is connected with the guide wheel; and the vibroflotation mechanism is arranged at one end of the steel wire rope and is used for carrying out a vibroflotation test. The filler-free vibroflotation test device for foundation treatment in the coastal sandy soil area is long and short in single-point treatment time, low in energy consumption and suitable for special geologies such as coral sand and marine sedimentary sand.