6343 results about "Grout" patented technology

The invention relates to the technical field of real-time prediction of three-dimensional forms, in particular to a real-time dynamic prediction system and method for the three-dimensional form of a high-pressure jet grouting pile. The method comprises the following steps: carrying out stratum characteristic identification on a construction site to obtain stratum distribution data; key monitoring point positions are determined according to the stratum distribution data, and a multi-source sensor monitoring network is established; carrying out anti-interference optimization processing on the multi-source sensor monitoring network, and carrying out real-time acquisition on high-pressure jet grouting parameters to obtain real-time high-pressure jet grouting data; and spatio-temporal evolution processing based on injection pressure, lifting speed and rotating speed is conducted on the real-time high-pressure jet grouting data, and parameter change characteristic data are generated. According to the method, the construction stratum distribution and the high-pressure jet grouting parameters are obtained and analyzed in real time, the parameter-stratum response relation model is established, grout diffusion and pile body forming dynamic prediction are conducted on different stratum characteristics in a targeted mode, and the precise construction capacity under the complex stratum condition is greatly improved.

The invention relates to the technical field of reservoir bedrock anti-seepage grouting, and discloses a reservoir bedrock anti-seepage grouting method which comprises the following steps: acquiring fracture data through geological exploration, and constructing a reservoir bedrock fracture distribution model; simulating a flow path and permeability characteristics of the slurry in the fracture based on the fracture model; the grouting pressure and flow are determined through an optimization algorithm, and a grouting scheme is formulated; screening grouting materials according to fracture characteristics, and analyzing stress-strain and permeability of the grouting materials; a construction process is formulated, the grouting state is monitored in real time, and parameters are dynamically adjusted; and after grouting, carrying out permeation and pressure test to evaluate whether the curing effect reaches the standard or not. Based on the three-dimensional fracture structure modeling and flow field simulation technology, high-precision recognition and dynamic evolution tracking of the fracture permeation path in the complex rock mass of the reservoir bank are achieved, so that grouting hole layout is more accurate, the slurry flow direction is more controllable, and the method is different from a point-selecting grouting mode of a traditional empirical method.

The invention discloses a tunnel grouting diffusion form prediction system and method. The system comprises a tunnel simulation device used for preparing a tunnel model with cracks to simulate a tunnel rock mass; the grouting simulation system is used for conducting grouting on the tunnel simulation device by adjusting grout diffusion influence factors, and the grout diffusion state under the influence of multiple factors is obtained. The grouting diffusion form quantification system is used for cutting the grouted tunnel simulation device to obtain a plurality of slices at depth positions, and performing grid division on the surface of the slice at each depth position to obtain a grout diffusion form quantification data set; and the grouting diffusion form prediction system is used for constructing a multi-modal space-time fusion depth prediction model and inputting the grout diffusion form quantitative data set into the multi-modal space-time fusion depth prediction model to predict the diffusion form of the future grout. According to the method, the prediction model is established, and the grout diffusion form quantitative data set is used as the space-time sequence data set, so that the space-time prediction of the grouting diffusion form is realized.

The invention relates to a high-performance solid-waste-based offshore wind power grouting material and a preparation method thereof, and a solid-waste-based cementing material is a hydraulic cementing material prepared by processing and grinding one or more solid wastes such as water-quenched blast furnace slag, steel slag, desulfurized gypsum, fly ash, red mud, tailings, carbide slag and phosphogypsum as raw materials according to a certain proportion. The solid waste-based cementing material is adopted to replace 525 Portland cement, the prepared grouting material product is excellent in performance, the carbon emission of the grouting material product is remarkably reduced, the cost is also reduced, resource utilization of industrial solid waste is facilitated, meanwhile, the performance of the grouting material is obviously improved, and the grouting material is suitable for popularization and application. The advantages of ultrahigh strength, elasticity modulus, high flowability, low shrinkage and high durability are realized.

The invention discloses a scouring pile foundation reinforcement method based on an MICP curing technology, which comprises the following steps: acquiring initial environment information such as scouring pit parameters, water flow parameters, tide period and seawater salinity of a delimited area around a pile, and determining grouting parameters such as a grouting window period and a safe flow velocity threshold value and a matching numerical value of a bacterial liquid concentration, a urea concentration and a calcium ion concentration; a grouting assembly composed of a first grouting pipe and a second grouting pipe which are spliced up and down is arranged, and grouting holes are formed in the side wall of the second grouting pipe which is pre-buried in a soil layer; after MICP slurry is prepared according to blending parameters, the slurry is injected into a soil layer in combination with grouting parameters, and meanwhile, the grouting process is dynamically adjusted by monitoring the resistivity of a soil body in real time; and after grouting is completed, the assembly is dismantled, and supplementary grouting is conducted on the local area according to the detection result. According to the method, the accuracy and reliability of pile foundation reinforcement are achieved through environmental parameter adaptation, grout dynamic regulation and control and layered detection and reinjection.

The invention provides a tunnel surrounding rock grouting control method and system, and relates to the technical field of tunnel engineering.The tunnel surrounding rock grouting control method comprises the steps that grouting parameters are obtained, and the grouting parameters comprise grouting pressure and slurry viscosity; performing multi-dimensional real-time monitoring on the surrounding rock fracture, and constructing a dynamic three-dimensional geologic model through the multi-dimensional real-time monitored data; performing grout diffusion path prediction based on the three-dimensional geologic model, and generating an initial grouting scheme through the predicted grout diffusion path; the fractal dimension is optimized according to a genetic algorithm, the grouting parameters are dynamically corrected through the optimized fractal dimension, and a grout diffusion result is obtained; establishing a multi-field coupling equation based on the slurry diffusion result, and optimizing the initial grouting scheme through the multi-field coupling equation to obtain an optimal grouting scheme; and according to the optimal grouting scheme, power pressure compensation is conducted, and grouting control is conducted. The problem that slurry diffusion is difficult to accurately control is solved.

The invention belongs to the technical field of grouting compactness detection, and particularly discloses and provides an intelligent detection system and method for the grouting compactness of a bridge prestressed pipeline, and the system comprises a signal acquisition and analysis module, a defect boundary calibration module, a defect recognition and analysis module and a compactness judgment and processing module. The method specifically comprises the steps that acoustic emission and fluctuation response signals are collected in real time through a sensor array arranged on the outer wall of a pipeline, and three-dimensional slurry density distribution is recognized; constructing an inner wall three-dimensional model in combination with a pipeline design drawing, dynamically setting a slurry density threshold value according to a grouting material formula and an environment temperature, and further calibrating a slurry defect boundary; extracting multi-dimensional features such as spatial positions, effective volumes, geometric regularity and types of the defects on the basis of boundaries, and calculating grouting compactness; and finally, according to whether the compactness reaches the standard or not, a grout supplementing early warning instruction or a detection report is automatically generated. According to the method, the reliability of defect identification and compactness calculation under complex working conditions is remarkably improved.

The invention relates to the technical field of building materials, and particularly discloses a high-performance solid-waste-based grouting material and a preparation method thereof. Comprising the following raw materials in parts by weight: 32 to 54 parts of Portland cement, 12 to 16 parts of a modified admixture, 2.4 to 3.6 parts of a functional filler, 42 to 56 parts of aggregate, 45 to 55 parts of a photoinitiator solution, 0.6 to 0.8 part of a water reducing agent, 0.9 to 1.1 parts of a composite expanding agent, 0.04 to 0.06 part of a defoaming agent and 9.2 to 12.4 parts of deionized water. Siloxane groups, acylamino groups, ester groups and benzene rings are chemically bonded on the surface of the modified admixture, so that the hydrophilicity of the modified admixture is reduced, the modified admixture can form hydrogen-bond interaction with hydroxyl groups and cement hydrates on the functional filler, and meanwhile, a flexible long-chain alkane structure on the functional filler can be entangled with the modified admixture, so that the flexibility of the modified admixture is improved. The mechanical property, the durability and the fluidity of the grouting material are improved.

The invention relates to the technical field of underground building engineering, in particular to a construction method for a basin type grouting waterproof curtain in an underground limited space. According to the method, through accurate analysis of geological data and reasonable arrangement of the positions and the depths of the grouting holes and the bottom sealing holes, it is ensured that the grouting area is covered comprehensively, the construction precision is improved, through model prediction control, the rate, the concentration and the sequence of grout injection are dynamically adjusted according to the flow and pressure data monitored in real time during grouting, and the grouting efficiency is improved. By means of the method, the diffusion range and compactness of materials can be accurately controlled in the slurry injection process, the gradient descent algorithm is combined with segmented grouting control, a permeation abnormal area existing in construction is recognized and repaired in time, slurry diffusion uniformity and construction efficiency are improved, continuity and integrity of a waterproof curtain are ensured, and the construction efficiency is improved. And through compactness monitoring and corresponding reinforcing measures, the risk of underground water leakage is reduced, construction of the closed structure is combined with arrangement of the drainage well, and the overall reliability of the project quality is improved.

The invention relates to the technical field of geotechnical engineering construction, in particular to a valley accumulation body curtain grouting construction control method based on SVM and PID, which comprises the following steps: obtaining construction data including stratum permeability coefficient, grouting pressure, slurry consistency, grouting flow and slurry diffusion range; constructing a three-dimensional geologic model of the canyon accumulation body, associating the parameters with corresponding positions in the model, generating a construction feature vector with geological attributes, inputting the construction feature vector into a pre-trained SVM model so as to predict a geological response trend, correcting control parameters of a PID control model according to the geological response trend, and then dynamically regulating and controlling operation parameters of grouting equipment, so as to achieve the purpose of predicting the geological response trend. PID control parameters and grouting key parameters are continuously optimized. Therefore, the problems that in the prior art, self-adaptive control over complex and changeable geological conditions is difficult to achieve, grouting parameter setting is not accurate, and construction quality is not stable are solved.

The invention discloses a high-toughness impervious polymer modified cement-based grouting material and a preparation method thereof, and belongs to the technical field of building repair materials. The component A is prepared from a cementing material, an admixture, a fine aggregate, a composite expanding agent, a polymer for concrete modification, fibers, an early strength agent, a water reducing agent, a composite retarder, a defoaming agent, an air entraining agent, a nano material and a functional component. The system solves the technical contradiction of toughness-strength-impermeability in the polymer modified cement-based material, and the material has excellent comprehensive performance: the initial fluidity is greater than or equal to 330 mm, the 28d compressive strength is greater than or equal to 82 MPa, the breaking strength is greater than or equal to 16.8 MPa, the bending-compression ratio is greater than or equal to 0.19, the impermeability pressure value is greater than or equal to 2.6 MPa, and the material is suitable for the fields of prefabricated buildings, tunnel engineering and the like.

The invention belongs to the technical field of offshore wind power generation, and discloses a jacket foundation and a jacket foundation construction method. The jacket foundation comprises a main frame body and a supporting structure, the main frame body comprises at least three supporting legs, the at least three supporting legs are arranged around a fan tower barrel, each supporting leg comprises a plurality of connecting sections arranged in the length direction, a first connecting part is connected between every two adjacent connecting sections, the connecting section on the topmost layer is used for being connected with the fan tower barrel, and the connecting section on the topmost layer is used for being connected with the fan tower barrel. The bottommost connecting section is used for being connected with a steel pipe pile fixed to the seabed. The supporting structure is arranged between every two adjacent supporting legs in the direction surrounding the fan tower barrel, the supporting structure comprises a plurality of supporting rod sets arranged in the height direction, the supporting rod sets are connected with the first connecting parts of the supporting legs on the two sides, first pouring spaces are formed in the first connecting parts, and the first pouring spaces are filled with grouting materials. The jacket foundation has high impact-shear bearing capacity and fatigue resistance, and safety and stability of fan operation are improved.

The invention discloses a grouting parameter intelligent feedback method based on rock mass groutability evaluation, which comprises the following steps: collecting geological condition data, rock mass quality data, field test data and grouting process data, and constructing a rock mass groutability grading data set; an SMOTE algorithm is adopted to process data imbalance, input indexes are screened through Pearson correlation analysis, and data are normalized through deviation standardization; an XGBoost classification model is constructed, hyper-parameters are optimized through grid search, the model is trained through K-fold cross validation, and the rock mass groutability grade is evaluated; constructing an XGBoost regression model by taking a rock mass groutability grade, grouting construction data and monitoring data as input, and predicting the maximum value and the minimum value of grouting pressure and slurry density by using an optimal model; and generating a grouting parameter interval according to the predicted maximum value and minimum value, and dynamically feeding back to the grouting equipment to regulate and control parameters. According to the method, scientificity and accuracy of rock mass groutability evaluation and grouting parameter regulation and control can be effectively improved.

The invention discloses an underground gas storage prestress lining structure and a construction method, and relates to the technical field of underground gas storage, the underground gas storage prestress lining structure comprises a lining layer formed by concrete pouring and internally provided with prestress steel bars; the sealing layer is arranged on the inner side of the lining layer and defines a gas storage chamber; the sliding layer is arranged between the lining layer and the sealing layer. The arrangement of the prestressed reinforcements can counteract part of internal pressure of the gas storage, so that the problem of concrete cracking is relieved. The lining layer is divided into the first lining layer and the second lining layer, the tensioning notch is reserved in the bottom of the first lining layer and provides sufficient tensioning space for the prestressed steel bars, the tensioning effect of the prestressed steel bars is ensured, the second lining layer is formed in the tensioning notch in a pouring mode after the prestressed steel bars are tensioned, and the integrity of the lining layer is ensured. After the sealing layer is constructed, grouting is conducted on the gap between the lining layer and the sliding layer, it is guaranteed that grouting is compact and complete, stress concentration is reduced, and the problem of concrete cracking is further relieved.

The invention relates to a variable-temperature dynamic-water coarse fracture grouting visual test system which comprises a visual simulation platform, and an artificial protolith is arranged in the visual simulation platform and used for simulating a coarse fracture; the grouting system is communicated with the visual simulation platform, and the grouting system is used for injecting grout into the visual simulation platform so that the grout can enter the rough fracture; the pressurizing system is communicated with the visual simulation platform and is used for injecting variable-temperature flowing water into the visual simulation platform, and pressure is provided for slurry entering the rough fracture through the variable-temperature flowing water; and the acquisition system is arranged in the visual simulation platform. On one hand, the device is used for researching the flow rule of the slurry under the static water or dynamic water condition, the diffusion rule of the slurry under different water environments is obtained through comparison, on the other hand, the diffusion rule of the slurry under the dynamic water condition and different roughness is researched, the field grouting condition is truly simulated, and the more accurate slurry diffusion rule is obtained.

The invention discloses a prefabricated reinforced concrete shear wall, and relates to the technical field of constructional engineering, the prefabricated reinforced concrete shear wall comprises a shear wall body, a sleeve main body, a wallboard, a steel bar main body and a pouring hole, the bottom of the sleeve main body is provided with a grouting cavity, and the center of the interior of the grouting cavity is provided with a moving disc. According to the prefabricated reinforced concrete shear wall, in the assembly process of the shear wall body, air in the vent groove is extruded through ascending of the movable disc, so that the positioning clamping rings move synchronously and are attached to the steel bars, the assembly precision and stability are improved, and the installation accuracy is ensured. During grouting and pouring, slurry fills and extrudes the supporting blocks, connection between the movable disc and the movable plate is relieved, the second through holes are formed, clamping of the steel bars by the positioning clamping rings is automatically relieved, stress concentration is avoided, and the structural safety is improved. And meanwhile, the movable plate moves downwards to touch the trigger block, and under the cooperation of the connecting plate and the spring, the connecting plate continuously vibrates to remove bubbles after pouring is completed, so that the bubble amount of slurry is reduced, and the structural compactness and durability of the shear wall are enhanced.

The utility model relates to a vertical connection node structure of a partially coated steel-concrete combination column, which is characterized in that a horizontal partition plate is preset at the bottom of an upper column, the horizontal partition plate is welded with the column in a factory, an upper column web plate can be reserved or cut off in a connection area, and a longitudinal steel bar and a vertical stiffening plate are welded on two sides of the horizontal partition plate of the upper column; it is guaranteed that the centers of the vertical stiffening plates and the centers of the longitudinal steel bars are aligned or deviated within a controllable range; when the upper column and the lower column are spliced on the construction site, only the flanges of the upper column and the lower column need to be welded in a butt joint mode, and the vertical stiffening plate of the upper column and the top partition plate of the lower column are welded. The thickness of the horizontal partition plate and the thickness of the vertical stiffening plate are designed and calculated, the reliability of force transmission of the horizontal partition plate and the thickness of the vertical stiffening plate are verified, and two connecting structures of a grouting-free joint and a grouting formwork-free joint can be achieved. Compared with the prior art, on-site construction procedures can be reduced, and construction efficiency can be improved.

The invention provides a modular assembly type steel reinforced concrete combined beam column joint and an assembly method thereof. The modular assembly type steel reinforced concrete combined beam column joint comprises a joint core, a steel reinforced concrete combined column, a steel reinforced concrete combined beam, a plurality of single-side self-locking high-strength bolts and a plurality of common high-strength bolts. The node core comprises a node core cavity, at least one connecting end and at least one group of L-shaped connecting end plates; threaded holes are formed in the corresponding positions of the L-shaped connecting end plates. The steel reinforced concrete combination column comprises a column-shaped steel framework and column concrete wrapping the column-shaped steel framework. Bolt holes are formed in the corresponding positions of the columnar steel framework; bolt holes, grouting holes and grout outlet holes are reserved in the corresponding positions of the column concrete; the steel reinforced concrete composite beam comprises a beam shoe, beam H-shaped steel and beam concrete wrapping the beam H-shaped steel. Bolt holes are formed in the corresponding positions of the beam H-shaped steel. The beam shoe is used for being connected with the node core. The scheme has the advantages of convenience in field assembly, high connection reliability, short construction period, capability of realizing dry connection and the like.

The grouting device for hydraulic engineering construction relates to the technical field of hydraulic engineering grouting and comprises a base, a stirring mechanism is arranged in the middle of the top of the base, a slurry pumping mechanism is arranged at one end of the top of the base, a push rod is arranged at the other end of the top of the base, and a switch panel is detachably connected to the middle of the top of the push rod. By arranging the stirring blades, slurry in the stirring tank can be stirred by utilizing the stirring blades, the purpose of cleaning the inner wall of the stirring tank can be achieved by arranging the spiral scraping plate and the conical vortex plate, and by arranging the air pump, air in the stirring tank can be pumped out, so that negative pressure is formed in the stirring tank; and after an electric control valve is adjusted, pumped air can enter the stirring tank from an air return pipe and is sprayed out from a spray head by utilizing high-speed airflow, the slurry on the surfaces of the stirring blades is further cleaned, and the purpose of preventing the slurry from being adhered to the interior of the device is achieved.

The invention discloses a grouting reinforcement method for a coal mine working face collapse and burst broken area, which comprises the following steps: S1, on-site investigation and survey are carried out, end face leakage and burst conditions are mastered, and collapse and burst broken reasons are quantitatively analyzed from two aspects of geological factors and engineering factors; s2, the grouting opportunity, the grouting position, the grouting material and the grouting parameters are determined through theoretical calculation, physical experiments and numerical simulation; and S3, a deep and shallow hole grouting mode is adopted for conducting grouting reinforcement on the caving and breaking area of the coal mine working face. According to various factors of coal mine working face collapse, a grouting mode combining deep and shallow holes is provided in a targeted mode, low-pressure slow grouting is adopted for the shallow holes, the shallow holes are used for sealing coal cracks in the working face superficial range, forming a curtain and preventing grout from leaking, floral tube grouting is adopted, the grout diffusion path is increased, and effective diffusion of grout is guaranteed; then deep hole grouting is carried out, and grouting modification is carried out on the coal body with the relatively low deep fracture development degree; therefore, the completeness and strength of the advanced coal body of the working face are improved, the caving condition is improved, top coal and a top plate are better supported, and then top coal leakage is controlled.

A waterfront soft soil area landscape pier precast pile comprises a concrete precast pile, the concrete precast pile comprises a pile top, a pile body and a pile tip, a steel reinforcement framework is arranged in the concrete precast pile, a drainage system and a grouting reinforcement system are arranged in the concrete precast pile, and the waterfront soft soil area landscape pier precast pile comprises a grouting pipe which longitudinally penetrates through the pile body from the pile top to the position above the pile tip. The top end of the grouting pipe extends out of the surface of the pile top to facilitate later grouting, the surface of the grouting pipe is connected with a grouting pipe branch pipe, the grouting pipe branch pipe extends out of the surface of the pile body in the radial direction, an included angle of 10-20 degrees is downwards formed between the grouting pipe branch pipe and the surface of the grouting pipe, and grout is sprayed along the inclined angle to form a mushroom-shaped reinforcing area to completely wrap the lower middle portion of the pile body. And the reinforcing area and the pile body form an integral collaborative stress body, so that the pile end resistance is further improved, and meanwhile, continuous consolidation settlement caused by excess pore water pressure is inhibited.

Provided in the present invention is a new connecting and fixing structure suitable for precast columns. The new connecting and fixing structure comprises a lower-layer precast column, an upper-layer precast column and an L-shaped fixing bracket, wherein a column cap connected to a frame beam is provided at the top of the lower-layer precast column; a cup-mouth-shaped recess is formed in the top of the column cap; the upper-layer precast column is fixed to an upper surface of the column cap by means of the L-shaped fixing bracket; a reinforcing bar at the bottom of the upper-layer precast column extends into the cup-mouth-shaped recess and is in lap joint with a reinforcing bar at the top of the lower-layer precast column; the edge of a gap between the upper-layer precast column and the column cap is blocked with blocking mortar; fine aggregate concrete with one grade higher than the concrete grade of a precast column is poured in the cup-mouth-shaped recess to a floor level elevation; the gap between the upper-layer precast column and the column cap is filled with a grouting material; and upper surfaces of the upper-layer precast column and the column cap are both connected to the L-shaped fixing bracket by means of bolts, and threaded sleeve metal members fitting with the bolts are pre-buried in the upper-layer precast column and the column cap. Further provided in the present invention is an implementation method for the new connecting and fixing structure suitable for precast columns.

Disclosed in the present invention are a prefabricated composite floor slab and steel bar truss floor deck directly utilizing old slabs, and a method. The prefabricated composite floor slab comprises new concrete, old concrete slabs, a slab bottom reinforcing mesh, a slab surface reinforcing mesh, steel bar trusses, steel dowel bars, and post-cast concrete. The steel bar truss floor deck comprises new concrete, old concrete slabs, a steel base plate, a slab surface reinforcing mesh, steel bar trusses, steel dowel bars, and support steel bars. According to the present invention, the old concrete slabs are directly utilized instead of being crushed into recycled blocks or recycled aggregates for reuse, thereby greatly simplifying processing procedures, significantly increasing the recycling rate of old concrete, and significantly reducing the usage amounts of new concrete and corresponding cement, thus achieving a significant carbon emission reduction effect; through holes are vertically drilled in the old concrete slabs, the steel dowel bars are inserted into the through holes, gaps between the steel dowel bars and the through holes are then filled with a high-strength grouting material, and shear resistance members are arranged on the side edges of the old concrete slats to enhance the shear resistance at the interface between the new concrete and the old concrete.

The invention relates to the technical field of geotechnical engineering, and discloses a composite grouting system for wind power plant foundation reinforcement, which comprises a vehicle body, the bottom of the vehicle body is rotatably connected with a long shaft, the two ends of the long shaft are fixedly connected with rollers, the top of the vehicle body is fixedly connected with a storage tank, one side of the outer wall of the vehicle body is fixedly connected with a motor, and the motor is fixedly connected with the storage tank. The output end of the motor is fixedly connected with a spiral electronic scale, the input end of the spiral electronic scale communicates with the output end of the storage tank, the output end of the spiral electronic scale communicates with a grouting pump, the output end of the grouting pump communicates with the outside, and a grouting system is installed in the vehicle body. The grouting pressure and the grouting flow are controlled through the grouting pumping module, so that stratum gaps are fully filled with grout, the compactness and the bearing capacity of a foundation are improved, the stability of the grouting flow is guaranteed, the problems that the grout blocks a pipeline or the pressure fluctuation is too large are solved, and the continuity and the safety of grouting construction are guaranteed.

The invention provides a grouting geology grading and construction parameter setting method based on rock mass permeability, and relates to the technical field of foundation engineering grouting construction.The method comprises the steps that the water permeability rate, fracture parameters (the number of independent unfilled fractures, the opening degree and the filling condition), ground stress and grout rheology data of a target hole section are obtained; calculating a grouted stratum grouting index (SGI) through the water permeability rate, the fracture number, the maximum equivalent fracture opening degree and the correction coefficient; the rock splitting strength is estimated in combination with the drilling condition; whether grouting is conducted or not is judged based on the SGI value, and the grouting starting water cement ratio, the grout changing strategy, the initial pressure and the pressure increasing strategy are dynamically adjusted; the grouting pressure is designed according to the stratum splitting strength, and the grouting termination condition is set in combination with the real-time flow-pressure data. Grouting parameters are optimized through quantitative grading and real-time data, experience dependence is reduced, the construction precision and efficiency are improved, the stratum adaptability is enhanced, and the engineering quality and the material utilization rate are ensured.

The invention discloses an offshore single-pile structure foundation and a construction method thereof, the offshore single-pile structure foundation is composed of a main pile, a suction barrel assembly and a grouting sealing cover, the outer part of the main pile is annularly sleeved with the suction barrel assembly, and the top of the suction barrel assembly is provided with the grouting sealing cover. The structural form that the variable-diameter single pile and the multi-subdivision annular suction barrel are combined is adopted, the advantages of extremely high vertical bearing of the single pile and horizontal reinforcing supporting of the suction barrel are fully played, the horizontal swing load resisting capacity of the single pile on the mud surface section is effectively improved, and the horizontal swing load resisting capacity of the single pile on the mud surface section is effectively improved through horizontal reinforcing of the external suction barrel structure. Meanwhile, the structural rigidity is improved, the stability is improved, and long-term use is stable and reliable; the independent center supporting sleeve is arranged in the middle of the suction barrel assembly, so that when a single pile is scoured, the inner ring of the suction barrel can avoid a scouring pit, self-sinking sealing is achieved without being affected, the suction barrel can smoothly sink to the designed depth, and the bearing requirement is met.

The invention relates to the technical field of tunnel engineering building materials, in particular to a double-slurry synchronous grouting material based on shield silty-fine sand and a preparation method of the double-slurry synchronous grouting material based on shield silty-fine sand. The liquid A is prepared from, by weight, 20%-30% of cement, 30%-50% of shield silty-fine sand, 5%-10% of bentonite, 5%-15% of mineral admixture, 0.1%-0.5% of stabilizer and 20%-30% of water, and the stabilizer is a water-soluble high-molecular polymer; the solution B is a water glass solution, and the volume ratio of the solution A to the solution B is (10-15): 1; the double-slurry synchronous grouting material further comprises a retarder and a coagulant, the retarder is citric acid, and the coagulant is a nano Ca (OH) 2 crystal nucleus. Bidirectional and gradient regulation and control of the gelation time between 5s and 100s can be realized through the coagulant and the retarder, and diversified requirements of different geological conditions and construction progress on slurry operation time are met.

The invention relates to the technical field of cement-based building materials, in particular to an ultra-high-performance grouting material for an offshore wind power jacket and a preparation method and application of the grouting material. Cement, fine aggregate, corundum micro powder, a superfine mineral admixture, a reinforcing agent, a reinforcing accelerant, an expanding agent, a water reducing agent, a defoaming agent and steel fibers are adopted as raw materials; the grouting material for the offshore wind power jacket, which is high in compressive strength and good in tensile strength and ultimate elastic tensile strength, is prepared by utilizing the compatibility of the superfine mineral admixture, the reinforcing agent and the reinforcing accelerant and cooperating with the steel fibers.

The invention discloses a soft rock tunnel pre-grouting reinforcement treatment method and equipment, and relates to the technical field of soft rock tunnel grouting reinforcement. Drilling operation is conducted on a tunnel face of a soft rock tunnel in a preset construction area so that a plurality of grouting holes distributed at intervals can be formed in the tunnel face, and a grouting pipe is installed in each grouting hole; and grouting equipment is sequentially communicated with the grouting pipes, grouting operation is conducted on the corresponding grouting holes through the grouting pipes, so that the piston nails in all the grout outlet holes are pushed to be anchored to the hole walls of the grouting holes, and grouting reinforcement operation is completed. Anchoring and connection with a geologic body on a tunnel face are achieved through the arranged grouting pipe and the piston nail installed in the grout outlet hole in the grouting pipe, the contact area between the grouting pipe and the geologic body can be increased through cooperation of the arranged grouting pipe and the piston nail, and the contact area between a grouting reinforcing body and the geologic body is increased; the strength of the geologic body is improved, the deformation trend of the geologic body is reduced, and the grouting reinforcement effect on the soft rock tunnel is improved.

The invention discloses a large-section tunnel excavation supporting system crossing a fault fracture zone, which comprises a plurality of self-propelled advanced large pipe sheds arranged on a tunnel vault before excavation and a plurality of advanced small pipes arranged on a tunnel side wall, after excavation of each layer is completed, steel-like fiber concrete is preliminarily sprayed on the top arch and the side wall of the corresponding excavation face, system anchor rods are constructed, then multiple steel supports are arranged on the top arch and the side wall of the corresponding excavation face in the longitudinal direction of the tunnel, and a plurality of cover-weight-free consolidation grouting holes are evenly formed in the top arch and the side wall of the whole section for grouting; and then a plurality of system anchor rods and drainage systems are evenly arranged on the top arch and the side wall of the excavation face, then reinforcing meshes are arranged between the steel supports, and then secondary injection of imitated steel fiber concrete is conducted. The problems that in the prior art, when a tunnel crosses a fault fracture zone, roof fall and collapse accidents are prone to occurring through common excavation supporting measures, and the construction safety and the project progress are seriously affected are solved.