24 results about "Shallow foundation" patented technology

The application discloses a shallow foundation reliability analysis method and device. The method comprises the following steps: selecting a deterministic bearing capacity envelope surface equation of a shallow foundation according to requirements; obtaining a probability single-axis bearing capacity sample set; converting the deterministic bearing capacity envelope surface by using the probability single-axis bearing capacity sample to generate a large number of probability bearing capacity envelope surface samples; setting a load combination sample according to requirements, comparing the load combination sample with the bearing capacity envelope surface sample, and carrying out reliability analysis by combining a performance function and a Monte Carlo simulation. The core of the application is to solve the probability single-axis bearing capacity, combine the deterministic bearing capacity envelope surface equation, construct the probability bearing capacity envelope surface, and carry out the shallow foundation reliability analysis by using the Monte Carlo simulation. The method avoids numerical analysis for different load combinations respectively, greatly improves the calculation efficiency, and is simple in principle and convenient to use, thereby providing an efficient and practical tool for the shallow foundation reliability analysis under complex geological and load conditions.

The invention discloses a shallow foundation reliability analysis method and device. The method comprises the steps that a deterministic bearing capacity envelope surface equation of the shallow foundation is selected according to requirements; obtaining a probability uniaxial bearing capacity sample set; converting the deterministic bearing capacity envelope surface by utilizing the probability uniaxial bearing capacity sample to generate a large number of probability bearing capacity envelope surface samples; setting a load combination sample according to requirements, comparing the load combination sample with a bearing capacity envelope surface sample, and carrying out reliability analysis in combination with a performance function and Monte Carlo simulation. The core of the method is that the probability bearing capacity envelope surface is constructed by solving the probability uniaxial bearing capacity and combining a deterministic bearing capacity envelope surface equation, and the reliability analysis of the shallow foundation is carried out by adopting Monte Carlo simulation. According to the method, the situation that numerical analysis is conducted on different load combinations is avoided, the calculation efficiency is greatly improved, the principle is simple, use is convenient, and an efficient and practical tool is provided for shallow foundation reliability analysis under the complex geology and load conditions.

The present application relates to a kind of simple calculation method of shallow foundation and clay seabed interface failure time under extreme storm surge action.The technical scheme is: measuring the roughness R of shallow foundation a , making structure;Collecting seabed clay at shallow foundation, carrying out dynamic simple shear test, test structure and the initial undrained shear strength S of clay interface u ;Select and set 0.4S u , 0.6S u , 0.8S u And 1S u As the typical amplitude of extreme storm surge load;Measured structure and the corresponding period number N of clay interface failure;Fitting extreme storm surge load amplitude and period number N logarithmic curve;According to wave force calculation formula, load amplitude is calculated;The amplitude is substituted into logarithmic curve and the corresponding period number N of interface failure and failure time are obtained.The present application can calculate the failure time of shallow foundation and seabed interface under extreme storm surge, provide the time length of shallow foundation against storm surge, determine the stability of shallow foundation, provide feedback for whether the shallow foundation of engineering site needs to be reinforced to resist extreme storm surge.

The utility model discloses a kind of first tunnel after well method foundation pit supporting structures, including underground continuous wall, the underground continuous wall is set in first tunnel after well method tunnel area upper foundation pit and tunnel area foundation pit junction, concrete crown beam is provided on the underground continuous wall, a mortar anchor rod is provided inside the concrete crown beam. The present application is mainly applied to the supporting structure between deep and shallow foundation pits, which can ensure the safety of foundation pit excavation, improve construction efficiency and reduce construction cost.

This invention discloses a method for calculating the bearing capacity of shallow foundations by integrating machine learning and nonlocal algorithms, belonging to geotechnical engineering. 1. The type of foundation soil is determined through indoor triaxial tests; strain-hardening foundation soils are analyzed; 2. Strain-softening foundation soils are analyzed; 3. A finite element model is established for refined simulation, followed by 7. 3. A constitutive model combined with a nonlocal algorithm is used for refined simulation, then proceeds to 4. 4. The influence range (DL) of the shallow foundation analysis is calibrated. f DL is determined by the softening rate control parameter β. f If suitable, proceed to step 7; otherwise, proceed to step 6. Step 6 involves building and training a machine learning agent model to ultimately obtain a suitable deep learning (DL) algorithm. f Shallow foundation analysis was performed with β1 and 7 to obtain the predicted value of the foundation bearing capacity. The present invention uses the above method to achieve efficient inversion of nonlocal parameters, thereby obtaining a reasonable predicted value of the shallow foundation bearing capacity.

The application provides a stability evaluation method based on an envelope surface of a shallow foundation bearing capacity under wave load. The technical scheme is: collecting soil samples on the engineering site and carrying out test calibration of soil parameters; establishing a three-dimensional numerical model based on a modified Cambridge model and calculating the initial bearing capacity of the shallow foundation; selecting and applying representative amplitudes of wave load to the shallow foundation to obtain the horizontal-moment bearing capacity envelope surface under different amplitudes of wave load; calculating the actual horizontal and moment loads borne by the shallow foundation according to the on-site wave load and determining whether the actual horizontal and moment loads are below all the horizontal-moment bearing capacity envelope surfaces to determine the stability of the shallow foundation. The application can truly simulate the working condition of the shallow foundation bearing the combined action of horizontal and moment cyclic loads in the marine environment, calculate the bearing capacity envelope surface of the shallow foundation under different amplitudes of wave load, determine whether the shallow foundation has a safety hazard, and provide a reference for whether reinforcement treatment measures need to be taken for the in-situ shallow foundation.

This invention relates to the field of road construction technology and discloses a reverse-construction cut-and-cover method for converting a highway into a bridge. The method includes the following steps: construction preparation and half-width closure, integrated pile-column construction, cap beam and superstructure construction, traffic diversion, reverse-construction cut-and-cover of the soil under the bridge, pier appearance treatment, and repeated construction. This invention directly constructs an integrated pile-column structure on the existing road surface, completely eliminating the need for deep foundation pit excavation (over 9 meters). It transforms high-risk deep foundation pit projects into low-risk shallow foundation pit projects, effectively avoiding safety accidents such as foundation pit collapse and roadbed slippage. Simultaneously, it eliminates the interference of deep foundation pit construction on adjacent highways, ensuring the safety of both construction personnel and passing vehicles.

The utility model relates to the technical field of buildings, and discloses a shallow foundation building deviation rectifying and reinforcing structure which comprises a reinforcing base and further comprises supporting plates fixed to the two sides of the top of the reinforcing base, the rear sides of the opposite sides of the two supporting plates are rotationally connected with a two-way lead screw, and one end of the two-way lead screw is fixedly connected with a first rotating disc. And moving frames are arranged on the two sides of the top of the reinforcing seat. A two-way screw rod can be rotated by rotating a first rotating disc, a movable frame drives two clamping rings to relatively move in cooperation with a threaded sleeve, if a supporting column needing deviation rectification is round, an L-shaped plate can be taken out from the interior of a clamping groove, then the two clamping rings abut against the surface of the supporting column, and first-layer reinforcement and correction are conducted through screws on the two sides; and then a second rotating disc is rotated to enable a screw rod to rotate in a moving frame, and a connecting ring is matched to move to abut against the surface of the supporting column for reinforcement and correction, so that the size of the supporting column can be corrected according to needs for adjustment and reinforcement.

The utility model discloses an ejection type lifting stage which comprises a frame body, an ejection table top and a driving device, the driving device comprises a winch and a servo motor, the ejection table top is arranged on the frame body in a lifting mode, the driving device is arranged on one side of the frame body, a lower pulley block is fixedly arranged at the bottom of the frame body, and an upper pulley block is fixedly arranged at the top of the frame body. The output end of the winch is connected with a steel wire rope set, and the steel wire rope set extends out of the winch, sequentially penetrates through the lower pulley block and the upper pulley block and then is connected with the ejection tabletop. Through driving control of the servo motor and combination of the structural design of the frame body, the rapid ejection performance effect can be achieved in the shallow foundation pit, and the shocking visual feeling is brought to audiences; the device is controlled by a servo motor, the speed is adjustable, the ejection height of performers can be adjusted at any time, and the device further has a lifting use function, is suitable for performers with different weights, and is easy to operate, convenient to maintain and high in use safety.

The utility model relates to the technical field of road and bridge engineering, in particular to a railway bridge pier shallow foundation structure which comprises a bottom layer foundation, a top layer foundation and a pier body, the cross section area of the bottom layer foundation is larger than that of the top layer foundation, and the cross section area of the top layer foundation is larger than that of the pier body. The bottom layer foundation, the top layer foundation and the pier body are all composed of steel bar grids and concrete, the steel bar grids are composed of transverse steel bars and longitudinal steel bars which are bundled together, and a reinforcing layer is further arranged on the transverse steel bars of the bottom layer foundation. The bottom-layer foundation, the top-layer foundation and the pier body form a stepped structure, the bottom-layer foundation serves as a main bearing layer and effectively disperses stress of the base, the top-layer foundation is connected with the bottom layer through stepped transition to form a stress diffusion gradient layer, and the transverse steel bars and the longitudinal steel bars form a bidirectional reinforcement structure system. The longitudinal steel bars achieve reinforcement ratio gradient transition through step type truncation, the stability and the bearing capacity can be improved, and convenience is provided for construction and maintenance.

The present application relates to the technical field of modular building structure, and particularly relates to a modular building based on a CLT-SMC composite system and an assembly method, which adopts an SMC steel structure frame as a core bearing layer, adopts a CLT wood wallboard as a surrounding function layer, and forms a composite bearing surrounding module by fixing the two through decorative connecting pieces and glued wood; the module is prefabricated in a factory and is integrated with water and electricity pipelines, degradable sealing materials, heat storage phase change materials and detachable lightweight partition walls; on site, shallow foundations and vibration isolation supports are used, horizontal splicing and longitudinal stacking of the module are realized through horizontal connecting plates, top corner pieces and high-strength bolts, and solar photovoltaic components are installed; after use, the building can be disassembled in reverse order, and the components can be reused after repair. Lightweight structure, flexible function conversion, rapid construction and low interference are realized, carbon emissions and ecological impact are significantly reduced, and full life cycle reversible circulation is supported.

The invention relates to the technical field of coal mine tunnel support and water disaster prevention and control, and discloses a bolting-grouting water plugging support method for a water-rich fault tunnel, which comprises the following steps: forming a shallow foundation support along with tunneling construction of a common anchor rod; a deep reinforcing anchor rod is constructed in the first lagging aging to form a deep reinforcing support; grouting anchor rods are arranged; and after second lagging aging after tunneling is finished, modified cement grout is prepared for grouting plugging, and the modified cement grout is prepared from Portland cement, water and a composite additive containing aluminate clinker, polyacrylamide and the like. According to the method, through a space-time cooperative control strategy of shallow surface protection deep suspension lagging grouting, repairing is carried out in the optimal window period of fracture development by using the rheological characteristics of surrounding rock; by matching with modified slurry with quick-setting early strength and underwater dispersion resistance, effective cementing and water stopping of broken surrounding rocks in a flowing water environment are realized, the water inflow of a roadway is reduced, and deformation of the surrounding rocks is controlled.

The process of improving thick soft and loose soils using deep soil-cement footings in combination with sand or cemented sand impact compaction footings is to address the weaknesses of DSM footings and also to increase the load-bearing capacity of the ends of single compaction footings in soft and loose soils. This system improves the mechanical behavior of the subgrade by longitudinally integrating the two types of footings. Depending on the type and thickness of the loose layers and the degree of soil consistency, four types of composite systems can be used to improve the ground, increase the bearing capacity, reduce the settlement of shallow foundations, and improve the stability of the bed in difficult coastal conditions:\n1. Sand impact compaction foundation + soil-cement foundation\n2. Cemented sand impact compaction foundation + soil-cement foundation\n3. Thick sand impact compaction foundation + soil-cement foundation\n4. Thick cemented sand impact compaction foundation + soil-cement foundation.\nThe choice of the type of system depends on the characteristics of the structure, the number of stories, and the amount of loads on the bed. It is also possible to increase the strength of the base by combining different base layers, either in the normal or cemented state.

The application discloses a construction method of a shallow foundation pit slope foot support in a narrow area, and belongs to the field of foundation pit support engineering construction. The method comprises the following steps: before the construction of the foundation pit excavation, measuring and setting out the foundation pit excavation range; excavating the foundation pit, excavating the foundation pit downward according to the designed slope coefficient until the designed design elevation of the excavation; measuring the range of the minimum working surface of the pit bottom, spreading lime, cutting the slope foot in the minimum working surface range for 3-5 m long, quickly driving wood piles with a length of more than 2 m at the slope foot of the cutting for 3-5 m, and the interval of the wood piles is 1 m per root; the cross beam is nailed on the baffle in advance, and then inserted into the baffle; after the wood piles and the baffle are completely installed around the foundation pit, rain cloth is laid on the slope; sand bags are pressed between the slope foot and the baffle, and the stability of the slope is further increased; after the above support work is completed, subsequent construction should be quickly carried out, backfilling is strived for as early as possible, and safety is ensured. The application solves the problem that the slope coefficient cannot meet the requirements, and designs a construction method of strengthening the support of the slope foot.

The utility model relates to the technical field of municipal engineering, in particular to a shallow foundation pit portable supporting device which comprises a first protection plate and a second protection plate which are distributed in a spaced mode. The mounting part comprises a plurality of supporting cylinders which are arranged on the sides, close to each other, of the first protection plate and the second protection plate respectively; the two ends of the adjusting rod piece are inserted into the supporting cylinders correspondingly, the length of the adjusting rod piece is adjustable, and the adjusting rod piece is used for abutting against the first protection plate and the second protection plate. The mounting frames are arranged on the first protective plate and the second protective plate, so that the adjusting rod piece is convenient to mount, the adjusting rod piece can adjust the distance between the first protective plate and the second protective plate according to needs, and the supporting device can adapt to various supporting scenes; and during transportation, the adjusting rod piece can be conveniently detached from the first protection plate and the second protection plate, and transportation is convenient.

The utility model relates to the technical field of building construction, in particular to a shallow foundation pit supporting device which comprises a soil retaining part and ground anchor steel pipes, the soil retaining part comprises four soil retaining plates which are arranged together in a surrounding mode, the soil retaining plates are perpendicular to the pit bottom of a shallow foundation pit and abut against the pit wall of the shallow foundation pit, and the ground anchor steel pipes are in one-to-one correspondence with the soil retaining plates. The ground anchor steel pipe is inserted into the top of the shallow foundation pit, and the soil retaining plate is connected with the ground anchor steel pipe through the connecting piece. The soil retaining plate supports the wall of the shallow foundation pit, the ground anchor steel pipe and the connecting piece fix the soil retaining plate, so that the stability of the soil retaining plate is improved, soil of an earthwork layer is prevented from flowing into the foundation pit through the soil retaining plate, the foundation pit is supported, the probability of collapse of the shallow foundation pit in a special section is reduced, and the construction safety of the shallow foundation pit is improved.

This application relates to the interdisciplinary field of geotechnical engineering and computer vision, and discloses an image recognition and analysis system for shallow foundation reinforcement conditions. The system includes an image acquisition and separation module for acquiring the foundation video stream and dividing it into a pre-reinforcement steady-state image, a dynamic sequence during reinforcement, and a post-reinforcement steady-state image; a transient displacement calculation module for solving the dynamic sequence and extracting the transient displacement field gradient mean and transient principal displacement vector angle; a frequency domain directional filtering module for mapping the principal displacement vector angle to orthogonal directions and constructing a directional two-dimensional Gabor filter bank to process the steady-state image; a spectral feature calculation module for calculating the high-frequency texture energy integral and outputting the directional compaction anisotropy index; and a state quantification evaluation module for fusing the displacement field gradient mean and anisotropy index to generate a reinforcement state index. This invention establishes a cross-domain mapping between macroscopic deformation and microscopic texture, improving the accuracy of foundation compaction assessment and realizing adaptive closed-loop control of foundation reinforcement construction.

This invention provides a method for excavating deep foundation pits with varying depths, including a shallow foundation pit A, a deep foundation pit B, and diaphragm walls. A set of diaphragm walls is arranged opposite each other. Both the shallow foundation pit A and the deep foundation pit B are located between this set of diaphragm walls. A fifth, fourth, third, and second steel support are sequentially installed above the shallow foundation pit A. A first concrete support is connected to the top of the set of diaphragm walls via micro-expansion concrete. A drainage ditch and a plain concrete wall are installed on one side of each diaphragm wall. This invention solves the additional problems associated with conventional deep-low pit excavation on an existing structure, as well as the challenges of large construction periods and the inability to quantitatively control lateral deformation of the existing structure. It avoids secondary deformation of the shallow foundation pit structure during initial construction, reduces construction joints, and improves construction efficiency.

The application discloses a shield under shallow foundation house active compensation system and method, and relates to the field of shield tunnel construction equipment.The application arranges a multi-source sensing matrix around a shallow foundation house, and obtains ground foundation displacement field and foundation inclination angle data in real time; a stratum foundation coupling settlement prediction model is established to output a predicted settlement field distribution; the size and application timing of a compensation force are determined according to a differential settlement gradient, a mixed compensation execution array composed of a hydraulic jack and a shape memory alloy driver is driven to implement active compensation; during the compensation process, a compensation correction amount is calculated based on real-time monitoring data and closed-loop iterative adjustment is performed, so that the deviation converges to a preset allowable threshold; after the shield passes through the influence area, the compensation force is gradually released according to a preset unloading gradient, and the compensation effect is evaluated according to the foundation rebound amount.The application can realize active control of differential settlement of a shallow foundation house, and improve compensation accuracy and stability.

The application discloses an independent foundation uneven settlement self-adjusting structure, which comprises a body, the body comprises two or more than two, further comprises a casing, the casing is same in number with the body, the lower bottom surface of each casing is located on the same horizontal plane, a sliding hole is formed in the upper portion of the casing, the sliding hole is matched with the lower end of the body, the body is slidably connected on the casing through the sliding hole, expanded rock is arranged in the sliding hole, the expanded rock is located between the bottom of the sliding hole and the lower end surface of the body, a first water guide hole is formed in the side wall of the casing, a second water guide hole is formed on the body, the upper end of the second water guide hole is formed in the side wall of the body, and the balance water pipe is communicated with the first water guide holes on two different casings. The method for resisting the uneven settlement of the single foundation by increasing the rigidity of the foundation beam when the shallow foundation is selected in the prior art can obviously increase the cost.

The invention belongs to the technical field of foundation pit supporting, and particularly relates to a shallow foundation pit steel pipe inclined strut embedded footstand cutting-free supporting construction method and a matched module. The method comprises the following steps: firstly, fully welding an embedded steel plate and a short steel bar into a positioning footstand module in a factory, and integrally embedding the positioning footstand module into a small concrete support on site to form a detachable cup opening; the bottom of the whole steel pipe inclined strut is inserted into the cup opening, and the top of the whole steel pipe inclined strut is cut-free; a square hole is reserved in the corresponding position of the bottom plate and is welded with a square water-stop steel plate for edge sealing; and after the bottom plate and the support changing plate reach the strength, the steel pipe is integrally pulled out, the pre-buried footstand and the water stop steel plate are permanently reserved, and the hole is sealed through secondary pouring. According to the method, zero scrap of the steel pipe is achieved, the whole steel pipe is recycled, no fire exists on site, water stopping is continuous, the method is suitable for narrow sites or frontage shallow foundation pits, and remarkable economic and green construction benefits are achieved.

The application discloses a deep replacement soft soil layer shallow foundation ultimate bearing capacity calculation method and device. The method firstly constructs a limit failure surface model controlled by a single variable angle a according to the foundation, replacement soil size and soil layer parameters. Then, based on the limit equilibrium principle, force and moment balance analysis is carried out, the foundation ultimate bearing capacity is decomposed into the sum of three sub-bearings of ground overload, soil internal cohesion and soil self weight, and the function relationship of each sub-bearing and the variable angle a is derived respectively. Finally, the function of the total ultimate bearing capacity about the variable angle a is established, and the minimum value is calculated by derivation or iteration, so as to determine the ultimate bearing capacity of the foundation. The application solves the limitation of the existing method which is only applicable to homogeneous foundation or shallow replacement by constructing a more practical complex failure surface model and carrying out rigorous mechanical derivation, and provides a reliable theoretical basis for the foundation bearing capacity calculation of deep replacement soft soil layer.

The application relates to a shallow foundation post-combined pile reinforcing structure of an active building and a construction method thereof, which comprises the following steps: digging a cast-in-place pile hole outside a shallow foundation, drilling a steel pipe pile hole, and inserting a steel pipe pile into the steel pipe pile hole; a foundation bearing platform is arranged at the upper parts of the cast-in-place pile and the steel pipe pile, a pile core steel reinforcement cage, a counter-pressure supporting plate and a connecting cap plate are arranged at the upper part of the steel pipe pile; during concrete pouring construction, the cast-in-place pile concrete pouring construction is first carried out, and the position of the steel pipe pile is controlled through stable anchoring plates and the self-weight of the cast-in-place pile concrete; strain gauges are arranged on the lower surfaces of frame beams near the shallow foundation, and reflective markers are arranged outside the structural columns; reinforcing supporting columns are arranged between the frame beams and building ground plates, rigid supporting bodies and pit-out solidifying bodies are arranged outside the excavated operation grooves. The application can improve the bearing capacity of the shallow foundation, reduce the influence of foundation reinforcing construction on the active building, and reduce the construction difficulty.

This invention provides a method for grouting reinforcement and support of shallow foundation pits in pebble strata, comprising the following steps: determining the excavation area to form a shallow foundation pit excavation zone; sequentially inserting multiple steel pipes arranged in a quincunx pattern along the outer edge of the shallow foundation pit excavation zone; sequentially grouting the spaced steel pipes; cyclically grouting each steel pipe; excavating the foundation pit according to the shallow foundation pit excavation zone; repeatedly excavating the pebble strata within the shallow foundation pit excavation zone, and repeatedly installing anchor bolts on the sidewalls within the shallow foundation pit excavation zone; finally excavating the pebble strata within the shallow foundation pit excavation zone to a predetermined position. This invention solves the technical problem that the support of shallow foundation pits in pebble strata still requires large-area reinforcement and support measures, leading to increased costs and long construction periods.