458 results about "Soil cement" patented technology

The invention discloses a drill rod for construction of an integrated stirring forming type cemented soil stiff anchor rod, the drill rod comprises a drill bit part and a hollow drill rod, the drill bit part comprises a shell, an anchor disc fixed in the shell and a spiral blade welded on the shell, and the hollow drill rod is inserted into the shell; the sheath steel pipe is inserted into the hollow drill rod and fixed to the shell, the grouting pipe is inserted into the sheath steel pipe, one end of the rod body is fixed to the anchor disc, and the other end of the rod body extends out of the sheath steel pipe. A first grouting hole is formed in the shell, and a second grouting hole is formed in the sheath steel pipe. The invention further discloses a construction method of the integrated stirring forming type cemented soil stiff anchor rod. When the method is used, the processes of hole forming, anchoring, grouting and the like are integrally formed, the process is simple, the speed is high, and the quality is easy to control; the formed cement-soil pile body is uniform in internal structure and reliable in strength; tension of the anchor rod is uniformly distributed, so that stress concentration can be reduced; and the formed cement soil pile body is high in end strength and good in safety.

A cementing operation cements casing in a borehole. A bottom plug pumped down the casing ahead of cement lands at a float valve. Circulation of the cement is established through the bottom plug to a shoe track downhole from the float valve. A top plug pumped down the casing behind the cement lands on the bottom plug. An internal component of the float valve is released by building-up pressure in the casing behind the internal component up to a release threshold. The internal component can latch at the shoe. At least some of the cement in the shoe track is displaced from the casing's shoe to the borehole by pumping the plugs and the internal component to the shoe. With the cement displaced out of the shoe track, the time required to drill out the assembly can be greatly reduced.

According to the intelligent control method and system for the double-wheel milling and deep stirring equipment, geological data of a construction area are obtained through preset stratum detection equipment, geological data corresponding to a construction groove section are determined, and the tunneling speed is intelligently adjusted in combination with the milling wheel torque monitored in real time and the current tunneling depth. According to the method, speed adjustment is carried out according to milling wheel torque data, tunneling depth and stratum geological data, meanwhile, associated data of the tunneling depth and the speed are generated, and finally cement paste is injected into a groove section when equipment is lifted. According to the intelligent control method, construction parameters can be adaptively adjusted according to different geological conditions, the milling efficiency and precision are effectively improved, equipment abrasion is reduced, and the service life of equipment is prolonged. Through the combination of real-time data monitoring and intelligent parameter adjustment, the method realizes the accurate control and optimization of the construction process of the milling and deep stirring equipment, and provides more efficient and reliable technical support for the construction of the cement-soil continuous wall.

The invention provides multi-proportion adjustable cement soil production and manufacturing equipment and a manufacturing method, and relates to the technical field of cement soil production, the multi-proportion adjustable cement soil production and manufacturing equipment comprises a mixer, the top of the mixer is integrally connected with a rotary bearing table, and the bottom of the mixer is integrally connected with a discharging pipe; wherein the rotary bearing table is provided with a rotary ring, the top of the rotary ring is integrally connected with a ring plate, the outer edge of the ring plate is provided with a tooth block, the tooth block is meshed with a gear arranged on a motor, and the motor is arranged on the rotary bearing table so as to drive the rotary ring to rotate through the meshing effect between the gear and the tooth block. Compared with the prior art, the invention has the following beneficial effects: 1, the unique combined design of the stirring plates and the stirring blades is adopted, so that the space occupation of the stirring structure in the mixer is obviously reduced; 2, the production process is greatly simplified, and a plurality of intermediate links are omitted; and thirdly, in combination with the training, tuning and testing of the XGBoost model, the optimal raw material proportioning scheme under different engineering conditions can be accurately predicted.

The invention relates to a construction method and construction equipment for a high-pressure jet grouting pedestal pile. The construction method comprises the steps that S1, the equipment enters a site; s2, taking a fixed pile cylinder, and pressing the fixed pile cylinder to a bearing stratum at a pile position; s3, the soil body in the hollow part of the fixed pile cylinder is taken out; s4, jet grouting cutting or expanding cutting is carried out in the undisturbed soil body at the bottom of the fixed pile cylinder to form an expanded pit; s5, molded concrete is fed into the expanded pit in a pressed mode, the molded concrete is limited to upwelling in the hollow part of the fixed pile barrel, and cemented soil in the expanded pit is extruded into the undisturbed soil body on the peripheral side of the expanded pit and the gap between the fixed pile barrel and the pile hole; an expanding body, a lower surrounding body, a reinforcing body and an upper surrounding body are respectively formed; and S6, concrete is poured into the hollow part of the fixed pile cylinder to form a pile body. During construction, surrounding soil is basically not disturbed, noise is low, the pile can be exploded, the upper surrounding body and the lower surrounding body which are integrally solidified and formed wrap and protect the joint part between the pile body and the expansion body, and the anti-shearing capacity of the joint part of the pile body and the expansion body can be greatly improved.

The invention discloses a cement-soil pile integrity detection method based on a high-density resistivity method. The method comprises the following steps: recording a background value of a pre-detection depth before construction; drilling holes or arranging in-hole electrodes by using original holes; the resistivity of the pile body after construction is measured by adopting a high-density resistivity method, and impedance inversion is carried out by using inversion software, so that complete resistivity tomography near the pile body is obtained, and the radius of each depth of the pile body is deduced according to the measurement result. The method is advanced and scientific, is simple to implement, conforms to the emerging information technology, can effectively and quickly obtain the continuous and complete depth profile of the pile body including the equivalent pile and the depth, obviously accelerates the measurement speed, greatly reduces the economic cost, obviously improves the measurement precision, and is suitable for popularization and application. The method has high reference value and guiding significance for detecting the diameter of the jet grouting pile.

The invention relates to the field of water conservancy project dams, in particular to a construction method of a dam composite flexible diaphragm wall. 2, equipment is in place; thirdly, wall forming is conducted through a construction method, and the equal-thickness cement soil underground continuous wall is formed; fourthly, the anti-seepage core plate is inserted; the anti-seepage core plate is composed of a body, a plurality of bundles of optical fibers are distributed inside or on the outer surface of the anti-seepage core plate, and the optical fibers extend downwards in the length direction of the body and can monitor environmental changes of the body and the underground diaphragm wall around the body. A continuous and uniform dam composite flexible anti-seepage wall can be formed for a winding dike, the erosion resistance and disturbance resistance of the anti-seepage wall can be improved, the anti-seepage durability is improved, meanwhile, whether a seepage area exists in the continuous wall or not is monitored through the anti-seepage core plate, and early warning is provided for effectively taking precautionary measures in time.

The invention belongs to the technical field of soft soil foundation treatment, and discloses a soft soil foundation road reinforcing structure and a construction method thereof.The reinforcing structure comprises a plurality of cement soil mixing piles arranged in a soft soil foundation in an array mode; the multiple core piles are used for being inserted into the cement-soil mixing pile before initial setting of the cement-soil mixing pile, the multiple core piles and the multiple cement-soil mixing piles are arranged in a one-to-one correspondence mode, and each core pile comprises a pipe pile and a reinforcing piece which is filled and fixed in the pipe pile; the geogrid layer is laid on the top of the soft soil foundation and located above the multiple core pile areas, and a plurality of meshes are formed in the geogrid layer; a mattress layer; and a filler. The integrality, water stability and certain strength of the road soft soil foundation can be effectively improved, the bearing capacity and shear strength of the road subgrade are remarkably improved, meanwhile, differential settlement of the road subgrade can be effectively controlled by reinforcing the soft soil layer, and the construction quality is improved.

The invention relates to the technical field of foundation pit construction equipment, in particular to a variable-diameter stirring drill bit for cement-soil inclined pile construction, which comprises a grouting core tube and a sliding drill rod, a lower expansion arm is arranged at the bottom end of the sliding drill rod, an upper expansion arm is arranged on the grouting core tube, and the upper expansion arm and the lower expansion arm are rotatably connected. The sliding drill rod is further provided with a slurry spraying hole, the inner wall, connected with the sliding drill rod, of the grouting core pipe is provided with a limiting structure, and the sliding drill rod is further provided with a centrifugal locking device which can be locked with the limiting structure when the sliding drill rod rotates. The centrifugal locking device can be automatically locked with the limiting structure on the inner wall of the grouting core pipe through centrifugal force, the locking mechanism can ensure that after the upper expansion arm and the lower expansion arm reach the preset reaming diameter, the reaming diameter can be kept constant no matter how the rotating speed changes, and therefore the reaming precision and stability are greatly improved.

The invention discloses a method and device for testing moisture migration in the frost heaving and thaw collapse process of fiber cement soil based on low-field nuclear magnetic resonance, and relates to the field of cement soil testing engineering.The method comprises the steps that T2 spectrums of the whole freezing process and the whole thawing process of a fiber cement soil sample are obtained; inverting a three-dimensional moisture distribution diagram of the whole freezing process and the whole melting process of the fiber cement soil sample according to the T2 spectrum; and determining moisture migration conditions of the whole freezing process and the whole melting process of the fiber cement soil sample according to the three-dimensional moisture distribution diagrams of the whole freezing process and the whole melting process of the fiber cement soil sample. According to the method, T2 spectrum data is mapped to a three-dimensional space position on the basis of a nuclear magnetic resonance (NMR) signal gradient positioning technology, and a pixel-level three-dimensional moisture distribution diagram of a fiber cement soil sample is obtained by performing data inversion on a T2 spectrum, so that pixel-level moisture migration conditions in the freezing process and the melting process of the fiber cement soil are visualized.

The utility model relates to a shield tunnel anti-floating structure which comprises a shield tunnel, a grouting body is arranged outside the shield tunnel, a mattress layer is arranged outside the grouting body, and a plurality of cement-soil piles are formed outside the mattress layer in a grouting mode. An embedded steel plate is arranged in the shield tunnel; a plurality of embedded anti-floating components connected with the embedded steel plate are arranged on the shield tunnel in a protruding mode, and the anti-floating components are sequentially arranged in the grouting body, the mattress layer and the cement-soil piles in a penetrating mode. The cushion layer can reduce the risk of segment slab staggering or differential settlement between the adjacent grouting holes, and deformation of the tunnel due to uneven stress is prevented; the anti-floating component plays a role in preventing the tunnel from floating upwards, and the shield tunnel anti-floating structure not only has a good tunnel anti-floating effect, but also prevents the tunnel from settling and deforming.

The invention relates to a cable protection pipe channel and a construction method thereof. The cable protection pipe channel is used for providing an arrangement space for the cable protection pipe combination body in the length direction of a cable and comprises two gravity type cement-soil walls, a foundation trench, a cushion layer, a backfill layer formed by a premixed flow state solidified soil fertilizer groove and a ground surface recovery layer. The two gravity type cement-soil walls are oppositely arranged and extend in the length direction of the cable, the foundation trench is formed between the two gravity type cement-soil walls and extends in the length direction of the cable, the cushion layer is laid at the bottom of the foundation trench, the cable protection pipe combination body is arranged on the cushion layer, and the backfill layer is filled in the foundation trench and completely covers the cushion layer and the cable protection pipe combination body. And the ground surface recovery layer is filled in the foundation trench and completely covers the backfill layer. The construction space can be reduced, waste of materials and resources is reduced, the construction difficulty is lowered, and potential quality hazards and potential safety hazards are reduced.

The utility model discloses a stress coordination type spiral steel pipe-cement soil combined pile which comprises a steel pipe, a steel ball, a steel ring cylinder, a spiral blade and a limiting assembly. The steel ring cylinder slidably sleeves the outer wall of the steel pipe; the spiral blade is mounted on the outer wall of the steel ring cylinder; the limiting assembly is installed on the steel pipe. The spiral blades are connected with the steel pipe in a sliding mode, loads are transmitted to the spiral blades on the lower portion in the load bearing process, stress is redistributed at the same time, the loads are evenly distributed, the problem of stress concentration at the connecting position of the spiral blades on the upper portion and the steel pipe is solved, the bearing performance is improved, and energy consumption is reduced.

The invention provides a construction method of a composite foundation pit supporting structure, which adopts a cement-soil mixing pile wall, a plurality of H-shaped steels, a reinforced concrete coping plate, a cement-soil wall top beam, a cast-in-situ bored pile row, a plurality of pre-stressed anchor rods, a pile row coping beam and a plurality of connecting beams, a cast-in-situ bored pile row is arranged on a construction working face, close to the foundation pit side, of a cement soil mixing pile wall, the upper end of a pre-stressed anchor rod is arranged on a pile row capping beam, the pre-stressed anchor rod obliquely penetrates through the cement soil mixing pile wall through a first channel, and a cement soil wall top beam and the pile row capping beam are in rigid connection through a connecting beam. The cement-soil mixing pile wall serves as an initial cantilever soil retaining main body, and is combined with the cast-in-situ bored piles to form an integral frame for connecting the cement-soil wall top beam and the pile-in-row capping beam, so that support-free excavation of the foundation pit can be realized, the construction operation is convenient, the construction period is effectively shortened, the manufacturing cost is saved, and meanwhile, the safety and the stability of the whole foundation pit in the excavation period are ensured.

The invention relates to the technical field of foundation pit construction, in particular to a composite foundation pit water stopping and supporting structure system under the complex geological condition and a construction method thereof.The water stopping and supporting structure system sequentially comprises a slope protection structure and a foundation pit water stopping and supporting structure from outside to inside, and the slope protection structure comprises a foundation pit cement soil stirring wall, stand columns and a reinforced concrete spraying layer; the foundation pit water retaining supporting structure comprises a front composite wall, a wall heel plate, a wall toe plate and a rear drilling pouring row pile, and the slope protection structure and the foundation pit water retaining supporting structure jointly form a foundation pit support suitable for the complex geological conditions with soft soil and hard soil layers and close to a gentle slope. The strength of the slope protection structure is further improved through stand columns and a reinforced concrete spraying layer, an h-shaped supporting structure is formed by a front composite wall, a wall heel plate, a wall toe plate and rear bored cast-in-place piles, the characteristics of a cantilever retaining wall and cast-in-place piles are combined, the cast-in-place piles permeate into the ground, loads are applied to one side of a soil body through filler, the bending strength is improved, and the slope protection effect is improved. The adaptability to complex geology is greatly improved, and in a complex foundation of soft soil, the protection structure and a soil body are of a synergistic structure, so that the stability and the overall rigidity of the foundation pit and the protection structure are guaranteed.

The utility model relates to a cement-soil mixing and conveying device, and belongs to the technical field of construction engineering equipment. The device comprises a bottom plate, a stirring box and a conveying mechanism are arranged on the bottom plate, a stirring mechanism is arranged in the stirring box, and the stirring mechanism comprises a first motor, a rotating rod, stirring blades, a discharging pipe and a first discharging valve; the conveying mechanism comprises a conveying barrel, a conveying shaft and a second motor; and a discharge pipe of the stirring mechanism is communicated with a conveying barrel of the conveying mechanism. The cement soil mixing and conveying device is scientific in design, reasonable in structure and convenient to use, materials can be conveniently and uniformly stirred through the stirring mechanism, the materials can be conveniently conveyed through the conveying mechanism, and cement soil is prevented from being solidified in the transportation process. The cement-soil mixing and conveying device solves the problems that an existing cement-soil mixing device is single in structure, uneven in mixing, prone to solidification and not high in practicability, and the cement-soil mixing quality is affected.

The invention discloses constant-temperature curing and loading integrated test equipment for preparation of mixing piles, and relates to the technical field of preparation of mixing piles, and the constant-temperature curing and loading integrated test equipment comprises a refrigerator, a constant-temperature device, a loading device and a multi-angle mixing pile preparation device. According to the constant-temperature curing and loading integrated test equipment for preparing the stirring pile, through coordination of heating and refrigerating, the temperature control precision of a conventional refrigerator is improved, and the uniformity of a temperature field in the refrigerator is guaranteed; the whole process from pile manufacturing, maintenance to loading is completed in the same constant-temperature space, interference caused by process conversion is eliminated, finally, the reinforcing process and effect of the inclined cement-soil mixing pile in the high-temperature frozen soil roadbed are accurately simulated, and test errors caused by temperature fluctuation and process separation in a traditional method are avoided; by quickly adjusting the angle of the stirring rod and selecting different spray hole combinations, one device can simulate various construction processes, different scientific research and test requirements are met, and the flexibility in use is improved.

The invention relates to an aggregate-adding construction method for cement soil spiral stirring pile construction, which comprises the following steps: acquiring a construction stratum type, determining a construction scheme according to the construction stratum type and preset engineering requirements, and setting equipment parameters according to the construction scheme; acquiring physical characteristics of the aggregate, determining the putting amount of the aggregate according to the physical characteristics of the aggregate, and adding the aggregate based on the putting amount of the aggregate; an equipment starting instruction is generated based on the equipment parameters, a drilling tool is controlled to stir aggregate and cement soil according to the equipment starting instruction, stratum feedback data is monitored in real time, and the rotating speed and the descending speed of a drilling rod are dynamically adjusted; and according to a preset construction period, the compactness and the mechanical property of the pile body are obtained, and quality evaluation is conducted on the compactness and the mechanical property of the pile body through the nondestructive testing technology. The device has the effect of improving the aggregate adding quality in the cement soil spiral stirring pile construction.

The utility model discloses a stress-controllable spiral steel pipe-cement soil combined bearing structure. The stress-controllable spiral steel pipe-cement soil combined bearing structure comprises a steel pipe, a steel ring cylinder, a fastener, a spiral blade and a limiting assembly, the steel ring cylinder slidably sleeves the outer wall of the steel pipe; the fastener is mounted on the steel ring cylinder; the spiral blade is mounted on the outer wall of the steel ring cylinder; the limiting assembly is installed on the steel pipe. The spiral blades are connected with the steel pipe in a sliding mode, loads are transmitted to the spiral blades on the lower portion in the load bearing process, stress is redistributed at the same time, the loads are evenly distributed, the problem of stress concentration at the connecting position of the spiral blades on the upper portion and the steel pipe is solved, the bearing performance is improved, and energy consumption is reduced.

The utility model discloses a foundation pit stand column foundation, and relates to the technical field of building foundation pits. The lower end of the fixed pipe is fixedly connected with a spiral blade, so that the lower end of the fixed pipe spirally enters the cement-soil mixing pile; the mounting seat is fixedly connected to the upper end of the fixing pipe, and two mounting plates are fixedly connected to the top of the mounting seat and are symmetrically arranged; and the supporting piece is fixedly connected to the top of the mounting base, and the lower end of the supporting piece is inserted between the two mounting plates and is fixedly connected with the two mounting plates. The resistance of the fixing pipe entering the cement mixing pile is reduced through the spiral blade, so that the construction efficiency is improved, the lower end of the H-shaped steel supporting piece can be inserted between the two mounting plates on the mounting seat, and the two mounting plates are attached to the inner wall of the H-shaped steel groove, so that the stability of the supporting piece is improved; and the upper end of the supporting piece is inserted between the two mounting plates at the bottom of the supporting plate, so that the foundation pit transverse supporting beam is stably supported.

The invention relates to a method for determining settlement and internal force of a stiffening core cement soil composite pile under the action of a vertical dynamic load of a pile top, and belongs to the technical field of bridge engineering. According to a cement soil radial reinforcement range, decomposing the calculation model into a cement soil reinforcement area and a cement soil non-reinforcement area, and determining a soil modal function, a characteristic equation and a characteristic root related to depth in different areas; a pile infinitesimal body settlement control equation is established and solved, and a soil settlement expression is obtained; determining the soil resistance per unit length of the stiffening core and the pile periphery interface; obtaining a stiffness core settlement and axial strain expression based on the stiffness core infinitesimal body settlement control equation; solving unknown coefficients in the stiffness core settlement and axial strain expression; and under the condition of different cement soil reinforcement ranges, a depth change diagram of settlement and axial strain of the stiffening core cement soil composite pile and a pile top vertical rigidity frequency spectrum response diagram are drawn. According to the method, the stiffness, settlement and axial strain spectrum response rules of the pile top of the stiffening core cement soil composite pile under the action of the vertical dynamic load of the pile top can be better reflected.

The invention discloses a gravel and pebble stratum waterproof curtain construction technology, and particularly relates to the technical field of waterproof curtain construction, and the technology comprises the following steps: S1, site preparation, S2, rotary drilling rig hole guiding, S3, pile casing embedding, S4, backfilling and leveling, and S5, three-axis cement mixing pile construction. The rotary drilling rig is adopted to guide holes for construction, the problems that a three-shaft mixing pile machine for the round gravel and pebble bed cannot normally drill and collapses can be solved, the construction period is shortened, site pollution is reduced, the advantages are obvious, the penetrating power of the three-shaft mixing pile machine can be enhanced, and the construction efficiency is improved. The adverse effect that a waterproof curtain of the profile steel cement soil mixing pile cannot be closed due to the fact that a three-shaft mixing pile machine cannot drill normally is avoided, and cost is saved.

According to the construction method of the carbon dioxide water-based foam cement soil high-pressure jet grouting pile, on the basis of a traditional triple-pipe high-pressure jet grouting pile construction technology, a triple-pipe high-pressure jet grouting drilling machine and a foaming machine for preparing carbon dioxide water-based foam are used in a combined mode; a foaming machine for preparing the carbon dioxide water-based foam, a cement paste preparation device, a water supply device and an air supply device are connected to a pumping transportation device through parallel pipelines, and the pumping transportation device conveys the carbon dioxide water-based foam, the cement paste, high-pressure water and air to a high-pressure jet grouting drilling machine. According to the method, on-site carbon dioxide curing conditions of the cement-soil jet grouting pile are achieved, carbon dioxide curing accelerates the cement carbonization effect and improves the carbonization degree, the early strength of the cement-soil jet grouting pile is greatly improved, and the curing period is shortened. And meanwhile, bubble holes of the carbon dioxide water-based foam have considerable carbon storage and carbon sequestration capabilities.

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

The present invention discloses a cement-soil pile construction device, aiming to provide a cement-soil pile construction device that can reduce manual operation, lower labor intensity, and improve the construction efficiency of tunnel reinforcement. It includes a high-pressure jet grouting pile machine, which comprises a jet grouting drill rod, a vehicle frame, a support tower rod arranged on the vehicle frame, a first guide rail arranged on the support tower rod, a sliding seat sliding along the first guide rail, a sliding seat moving actuator for driving the sliding seat, and a rotary power head arranged on the sliding seat. The jet grouting drill rod includes a drill body and a drill rod tail connected to the upper end of the drill body, and the drill body is composed of several connected drill pipes connected in sequence; a walking vehicle, on which an installation platform is provided, and the high-pressure jet grouting pile machine is installed on the installation platform through the vehicle frame; a drill pipe automatic installation device, which includes a drill pipe placement rack and a manipulator arranged on the installation platform, and the drill pipe placement rack is used for placing the connected drill pipes of the jet grouting drill rod.

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

To provide a single pile foundation for offshore wind power generation that protects the seabed soil layer and structure of a single pile for wind power generation, reduces the impact of water currents to protect the foundation of equipment, improves safety and lifespan, and improves load-bearing capacity.SOLUTION: A single pile foundation for offshore wind power generation includes a floating engagement tank, a soil cement expansion pipe, and a reinforcing structure. One end of the soil cement expansion pipe is connected to the floating engagement tank, and the other end of the soil cement expansion pipe is connected to the reinforcing structure. The reinforcing structure includes an inner sleeve, a rib plate, and a steel net. The rib plate is arranged in an annular shape on the outer wall of the inner sleeve and is provided radially outward. The steel net is also provided in an annular shape around the outer wall of the inner sleeve.SELECTED DRAWING: Figure 1

The utility model discloses a sliding type spiral steel pipe-cement soil combined pile which comprises a steel pipe. The steel ring cylinder is arranged on the outer wall of the steel pipe in a sliding and sleeving mode, a plurality of sliding assemblies are installed on the inner wall of the steel ring cylinder, the sliding assemblies are in sliding fit with the steel pipe, and spiral blades are fixedly connected to the outer wall of the steel ring cylinder; wherein an elastic assembly is installed in the wall thickness of the steel pipe, and the elastic assembly is fixedly connected with the sliding assembly. Stable and unchanged welding connection between the spiral blade and the steel pipe in the spiral steel pipe-cement soil composite pile is converted into sliding connection, more loads are transmitted to the spiral blade on the lower portion through relative sliding among the spiral blade, the steel cylinder ring and the steel pipe, stress is redistributed, and the stress distribution effect is improved. The purpose that loads are evenly distributed along the full length of a pile body is achieved, and the problem that stress is concentrated at the connecting position of an original upper spiral blade and a steel pipe is greatly solved.

The invention discloses a stiff composite pile construction detection method based on a quantum technology and an electromagnetic geophysical prospecting method, which comprises the following steps of: constructing a peripheral cement soil pile and a core pile, and doping an electromagnetic sensitive material into a cement soil curing agent; a quantum gravity gradiometer and an electromagnetic induction instrument which are integrated on construction equipment are used for collecting gravitational field and electromagnetic field data of a construction area in real time in the whole process of cement soil stirring and core pile pressing-in; the density, the water content distribution and the uniformity of the cement soil are inversed and regulated in real time, and an unfavorable geologic body is identified; dynamically adjusting construction parameters based on cement soil properties and geological conditions obtained by inversion, and performing targeted reinforcement on a bearing stratum; the pile end stress bubble formation and the pile-soil interaction effect are verified; and based on the multi-source data acquired in the whole process, generating a digital quality file of the single pile for quality acceptance. The method can realize a construction process, namely a detection process, a single pile, namely a sensor, and a global data driving decision.

The invention relates to the technical field of construction engineering, in particular to a preparation method of a full-replacement variable-cross-section cement-soil pile. According to the cement soil pile, a long spiral drilling machine is adopted for drilling a hole in a foundation soil layer, a drill rod is rotated when lifted, and under the action of a cutting tool bit of a special drill bit, the drill rod is rotated, lifted and pumps cement soil slurry at the same time, so that a variable cross-section shape can be formed in the required position of a pile body. Holes are firstly formed, soil is taken out, water, cement, a curing agent and the like are added for stirring outside the holes, and then the soil is poured into pile holes under pressure, so that the full-replacement variable-cross-section cement-soil pile is formed. The novel replacement type variable-cross-section cement-soil pile is formed, the problem that stirring of a stirring pile is not uniform when the stirring pile meets a clay layer is solved, and the construction quality of the cement-soil pile is improved; the bearing capacity of the cement-soil pile is improved through the variable cross section; compared with an in-situ stirring method, the full-replacement cement-soil pile can reduce cement consumption, and conforms to the policy of energy conservation and emission reduction.