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51 results about "Plate load test" patented technology
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Deeply-loadable spiral plate load test device and method thereof
InactiveCN103195042AAvoid measurement errorsImprove test accuracyIn situ soil foundationPlate load testData acquisition
The invention discloses a deeply-loadable spiral plate load test device. The deeply-loadable spiral plate load test device comprises a ground anchor and a spiral plate, wherein the ground anchor is connected with a ground anchor dowel bar; a cross beam is arranged on the ground anchor dowel bar; one end of the spiral plate is connected with one end of a deeply-loading one-way oil hydraulic jack; the other end of the deeply-loading one-way oil hydraulic jack is connected with one end of the dowel bar; a pressure sensor for measuring oil pressure thereof is arranged on the deeply-loading one-way oil hydraulic jack; the other end of the dowel bar is connected with the cross beam through a dowel post; the pressure sensor is connected with a data acquisition instrument; and the deeply-loading one-way oil hydraulic jack is connected with a manual oil pump. The invention further discloses a deeply-loadable spiral plate load test method. Through deep loading, a measuring error caused by load eccentricity can be avoided, the test precision can be improved, and reality and reliability of the test result can be ensured; bearing capacities and deformation coefficients of soil at different depths can be tested and studied; and the deeply-loadable spiral plate load test device and the deeply-loadable spiral plate load test method are applicable to on-site test on the bearing capacities and deformation characteristics of clay, sandy soil, silt and other foundation soil.
Owner:ANHUI TRANSPORTATION HLDG GRP CO LTD +1
Novel method for determining foundation bearing force
The invention discloses a novel method for determining foundation bearing force. According to the method, deformation and strength parameters of a foundation soil body can be reversely obtained according to an in-situ pressing plate load test of a foundation, a calculation model is built for calculating P-S curves of an actual foundation soil body, and then according to the P-S curves, the bearing force of the foundation soil body is determined according to the requirements of the foundation soil body for the settlement control value and the strength safety coefficient. Different from situations in a traditional method, the strength and deformation parameters of the foundation soil body instead of a characteristic value of the bearing force of the foundation soil body are obtained according to the pressing plate load test in the novel method, and therefore various defects existing in the traditional method in an existing specification can be overcome, and the real and correct foundation bearing force can be obtained.
Owner:杨光华
Electromagnetic type dynamic plate load test detecting device and method
ActiveCN103225320AMeet the functional requirements of the load testEasy to carryFoundation testingMaterial strength using repeated/pulsating forcesPlate load testControl system
The invention claims an electromagnetic type dynamic plate load test detecting device and a method. The device disclosed by the invention is characterized in that an electromagnet assembly, an impacting rod and an impact seat plate assembly are respectively arranged above an external sleeve, in the external sleeve and under the external sleeve; a plurality of levels of electromagnet accelerating coils are arranged on the inner side wall of the external sleeve; the levels of electromagnet accelerating coils are respectively in external connection with a circuit control system; the impact seat plate assembly comprises an impact seat and a bearing flat plate; the bearing flat plate is fixed at the bottom of the impact seat; the impact seat plate assembly is statically arranged; the external sleeve is sleeved into the impact seat; and the method disclosed by the invention is characterized by realizing acceleration of the impacting rod by discharging via the plurality of levels of electromagnet accelerating coils in the process of impacting the impact seat via the impacting rod in order to improve the impact energy and speed. By adopting an electromagnetic type graded accelerating impact rod in the device disclosed by the invention, the impact energy and the speed of the impacting rod can be effectively improved; the realized impact force is more than 1000 times to the weight of the impacting rod; and electric supply is taken as a dynamic source, so that the device disclosed by the invention can be better applied to vertical and horizontal foundation plate load test detection.
Owner:北京双杰特科技有限公司
Quick flat-plate load test method
ActiveCN103389244AFast test detection speedThe detection process is fastMaterial strength using tensile/compressive forcesPlate load testDeformation modulus
The invention discloses a quick flat-plate load test method which comprises a foundation coefficient Ks quick test method and a secondary deformation modulus Ev2 quick test method, wherein the foundation coefficient Ks quick test method comprises the steps of employing primary loading to the maximum load and calculating the Ks value according to the load and the settling volume; the secondary deformation modulus Ev2 quick test method comprises the steps of employing primary loading to the maximum load, removing total loads after the settling volume is relatively stable, performing secondary loading to the required load, and calculating the Ev2 value according to the load and the settling volume. Only several minutes are required during the test, the test time is greatly shortened, and the detection efficiency is improved, so that the flat-plate load test is high in detection speed and accurate in detection result.
Owner:CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
Method for testing deformation modulus of foundation soil by flexible bearing plate load test
InactiveCN107796279AGuaranteed accuracyNo added costHeight/levelling measurementElectrical/magnetic solid deformation measurementPlate load testDeformation modulus
The invention discloses a method for testing the deformation modulus of the foundation soil by a flexible bearing plate load test with relatively high test precision. The method includes the steps ofpreparing a bearing plate, installing a cuboid-shaped air bag with a pump air hole on the lower portion of a bearing plate before testing, forming a flexible bearing plate, where a first displacementmeasuring device used for measuring the settlement value of the bearing plate is arranged, installing a second displacement measuring device used for measuring the thickness change value of the air bag in the air bag, applying a vertical pressure p to the bearing plate during testing, generating air pressure p by pumping air in the air bag through the pump air holes, so that the vertical pressureP and the air pressure p in the air bag meet P= A * p, enabling the bottom surface of the air bag to be attached to the surface of the foundation soil, wherein A represents the area of the bag bottom,taking the total value of the settlement value s1 measured by the first displacement measuring device plus the thickness change value s2 of the air bag measured by the second displacement measuring device as a settlement value s at the center of the bottom of the flexible bearing plate, and calculating the deformation modulus e0 of the foundation soil in combination with other parameters.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Method for eliminating impacts of dowel bar bending on accuracy of spiral plate load test and displacement detector used in same
ActiveCN105507226AMature method of operationWide adaptabilityIn situ soil foundationGratingPlate load test
The invention provides a method for eliminating the impacts of dowel bar bending on the accuracy of the spiral plate load test and a displacement detector used in the same. The method and the displacement detector have the beneficial effects and advantages that the problem that the accuracy of the spiral plate load test is impacted by dowel bar bending can be completely eliminated by arranging the displacement detector for detecting the sinking displacement of a spiral bearing plate underground, namely the bottom end of a hollow dowel bar; a linear capacitive grating displacement transducer is adopted for displacement detection; moving and static grating polar plates of the linear capacitive grating displacement transducer are respectively arranged on a hollow force transfer shaft and a drive joint of the displacement detector; during measurement, the position of the drive joint is fixed, that is, the static grating polar plate is fixed, and the moving grating polar plate moves with loading of the hollow dowel bar, thus the displacement of the spiral bearing plate can be accurately detected; a drilling machine is adopted as a rotary pressure device acting on a casing pipe; an oil jack is adopted as a loading device of the hollow dowel bar; the method has the characteristics of mature operation method and extensive adaptability.
Owner:铁三院(天津)工程有限公司
Particle discrete element simulation method and equipment for plate load test of sandy soil foundation
PendingCN114218651AAccurate acquisitionExact elastic modulusGeometric CADDesign optimisation/simulationDiscrete element simulationSoil science
The invention provides a particle discrete element simulation method for a sandy soil foundation plate load test. The particle discrete element simulation method is particularly suitable for sandy soil foundations such as coarse sand and gravelly sand with coarse particles. Microscopic parameters required by a simulation test are calibrated based on an indoor geotechnical test, the size of a foundation model is determined according to a Prandite foundation bearing capacity theory, the foundation model is constructed based on the calibrated microscopic parameters according to the grain composition and relative density of foundation soil and the determined model size, the model is simplified by adopting a semi-infinite space body hypothesis, and the model is constructed. On the basis that directional loads including vertical loads and inclined loads are applied to the foundation model step by step, under the given stability judgment standard, the settlement amount generated by the foundation under the action of each stage of load is recorded, and the test is stopped until the foundation model is damaged in the step-by-step loading process. The particle discrete element simulation method for the sandy soil foundation plate load test not only has academic research value, but also has considerable economic benefits.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Method for testing compactness of pre-paved ballast track bed
ActiveCN109137648AReduce influence errorEasy to operateMeasuring apparatusPlate load testEngineering
The invention relates to the field of foundation compactness testing, in particular to a method for testing compactness of a pre-paved ballast track bed, including the steps of carring out plate loadtest on test surface of test site to obtain foundation coefficient K of the test surface of test site, and substituting foundation coefficient K into polynomial regression equation p=AK2+BK+C to obtain compaction density po. The polynomial regression equation is obtained by the following steps: carrying out plate load test on a plurality of samples taken from the test site to obtain the foundationcoefficient K = theta / S; testing the above samples by both irrigation and sand pouring methods, and then obtaining the average value of the results of the two tests to obtain the compaction density Rho; taking the foundation coefficient K and compaction density Rho as the transverse and longitudinal coordinates respectively to establish the coordinate system, and fitting the discrete points linearly to obtain the polynomial regression equation. The invention has the advantages of high operability, less external influence factors, reduced volume deviation of the quantity test pit and the probability of test deviation, and accelerated compactness test speed.
Owner:CHINA RAILWAY 21TH BUREAU GROUP
Rapid Plate Load Test Method
ActiveCN103389244BFast test detection speedThe detection process is fastMaterial strength using tensile/compressive forcesPlate load testDeformation modulus
The invention discloses a quick flat-plate load test method which comprises a foundation coefficient Ks quick test method and a secondary deformation modulus Ev2 quick test method, wherein the foundation coefficient Ks quick test method comprises the steps of employing primary loading to the maximum load and calculating the Ks value according to the load and the settling volume; the secondary deformation modulus Ev2 quick test method comprises the steps of employing primary loading to the maximum load, removing total loads after the settling volume is relatively stable, performing secondary loading to the required load, and calculating the Ev2 value according to the load and the settling volume. Only several minutes are required during the test, the test time is greatly shortened, and the detection efficiency is improved, so that the flat-plate load test is high in detection speed and accurate in detection result.
Owner:CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
Method for Predicting Post-construction Settlement by Static Load Test of Road Composite Foundation
ActiveCN106702999BNew technology of predictive static load testIn situ soil foundationPlate load testEngineering
The invention discloses a method for pre-estimating post-construction settlement of a composite road foundation by a static load test. The method comprises the steps: obtaining a value of the pile-soil stress ratio; conducting a multi-stage loading test to the maximum test load, and then judging stability; after stability judging, continuing a sustaining load delaying test; determining relevant parameters for pre-estimating the post-construction settlement by a laboratory test and engineering experience; according to test data including the pile-soil stress ratio, settlement parameters and the relevant parameters, predicting the secondary consolidation coefficient of soft soil, pre-estimating post-construction secondary consolidation settlement, and calculating post-construction primary consolidation settlement; converting a measured settlement value of a plate load test to an immediate settlement value of the actual working condition of the composite foundation, and integrally pre-estimating the total post-construction settlement of the composite foundation according to the immediate settlement value of the actual working condition, the primary consolidation settlement and the secondary consolidation settlement. The method develops a new static load test technology capable of pre-estimating the post-construction settlement of the composite foundation and provides a new idea for the further development and benefit exerting of the static load test technology for the composite foundation.
Owner:江苏路业建设有限公司
Narrow groove shallow flat plate load test method
PendingCN113789772ASolve the dangerFix stability issuesIn situ soil foundationPlate load testClassical mechanics
Owner:CHINA CONSTR FIFTH ENG DIV CORP LTD
Flat plate load test integrated loading vehicle for surveying bearing characteristics of giant-grained soil
ActiveCN224137014UMaterial strength using tensile/compressive forcesHeight/levelling measurementPlate load testTrackway
The utility model relates to a flat plate load test integrated loading vehicle for surveying the bearing characteristic of giant-grained soil, which belongs to the technical field of foundation surveying and comprises a loading vehicle head, a loading vehicle chassis is fixedly mounted on the surface of the loading vehicle head, and a surveying structure is arranged on the loading vehicle chassis. The surveying structure comprises two sliding rails which are fixedly installed on the surface of a chassis of the loading vehicle. According to the flat plate load test integrated loading vehicle for surveying the bearing characteristic of the huge-grained soil, anchoring operation can be directly carried out on a construction site through the electric anchor drill, a counter-force system does not need to be constructed by depending on an external balance weight or an anchor pile, the construction time of the counter-force system is greatly shortened, and the construction efficiency is improved. The loading vehicle is simple in structure and convenient to use, the situation that in a traditional test, a large amount of time is consumed due to the fact that a proper balance weight or anchor pile position is found is avoided, the loading vehicle is higher in site adaptability, a plate load test can be conducted in a wider construction site, the problem that a traditional test device is limited by the site is solved, and the flexibility and convenience of the test are improved.
Owner:CHONGQING JIAOTONG UNIV
A method and apparatus for rapid plate load testing in space
ActiveCN120628823BFoundation testingMaterial strength using tensile/compressive forcesPlate load testData acquisition
The present application relates to the technical field of load testing, and more particularly to a space fast flat plate load test method and device. The method comprises the following steps: connecting a depth-adjustable force transmission frame with a bearing flat plate through a magnetic adsorption structure and establishing a data transmission link between the bearing flat plate and a multi-source data acquisition module; obtaining different space target test depths and calculating splicing length error, and triggering a matching gap if the splicing length error exceeds; synchronously collecting strain data and calculating corresponding transmission load to construct a depth-load-settlement three-dimensional relationship surface; identifying and counting corresponding space depth mutation test points according to the depth-load-settlement three-dimensional relationship surface and regenerating load-settlement data; fusing the load-settlement data with corresponding strain data and performing space bearing visualization to generate mechanical property space bearing deformation distribution corresponding to different depth distribution. The present application can realize efficient and accurate testing of flat plate bearing force in different spaces.
Owner:GUANGZHOU GUANJIAN MATERIAL TESTING CO LTD
Load testing device for autoclaved aerated concrete plate
PendingCN114397178AImprove accuracyReduce the situation where the contact area gradually decreasesStrength propertiesPlate load testMechanics
The invention relates to the technical field of test equipment, and discloses an autoclaved aerated concrete plate load test device which comprises a device body and two supporting plates arranged on the device body, and each supporting plate is connected with the device body through an adjusting assembly. The adjusting assembly adjusts the supporting plate according to deformation of the autoclaved aerated concrete plate, so that the supporting plate is attached to the autoclaved aerated concrete plate. The device body, the supporting plate and the adjusting assembly are arranged, and the adjusting assembly is used for adjusting the supporting plate, so that the supporting plate is attached to the end face of the autoclaved aerated concrete plate, and the situation that the contact area of the autoclaved aerated concrete plate and the supporting plate is gradually reduced in the deformation process is reduced; therefore, the accuracy of testing the autoclaved aerated concrete plate by the load testing device is improved.
Owner:济南纳斯诺工业测试系统有限公司
Spiral plate load test probe based on soil layer pressure and settlement displacement test
The utility model discloses a spiral plate load test probe based on soil layer pressure and settlement displacement test, which comprises a cylindrical load transmission rod connected with a probe rod, and a wire passing hole is arranged in the cylindrical load transmission rod; the rod body is sequentially provided with a probe rod connecting part, an upper torsion transmission part, a pressure sensing part, a lower torsion transmission part and a spiral plate shaft connecting part; the outer diameter of the pressure sensing part is small, and a resistance-type strain gauge is attached to the surface to measure soil layer pressure; the up-and-down torque transmission part is matched with an external torque sleeve through a spline to transmit torque; a displacement detection assembly is arranged between the lower torsion transmission part and the torsion sleeve and comprises a movable capacitor plate moving along with the rod and a fixed capacitor plate fixed to the torsion sleeve. The upper end and the lower end of the torsion sleeve are in threaded connection with the upper connector and the lower connector respectively to limit the axial movement range of the load transmission rod, and the movement amount is the displacement measurement range. The lower end of the spiral plate shaft connecting part is connected with a spiral plate assembly. The probe is high in integration level and can synchronously monitor soil layer pressure and settlement displacement.
Owner:CHINA RAILWAY DESIGN GRP CO LTD
A kind of deep loading spiral plate load test device and method thereof
InactiveCN103195042BAvoid measurement errorsImprove test accuracyIn situ soil foundationObservational errorPlate load test
Owner:ANHUI TRANSPORTATION HLDG GRP CO LTD +1
Panel load, static sounding, spinning sounding and dynamic sounding test all-in-one machine
The invention discloses a flat plate load, static sounding, spinning sounding and dynamic sounding test all-in-one machine. Comprising a loading platform (1), a crawler walking device (2), an engine system (3), a walking control system (4), static sounding probe rod penetration counter-force equipment (11), rotary press-in sounding probe rod penetration counter-force equipment (12), dynamic sounding probe rod penetration counter-force equipment (14), a flat plate load test module (18), a loading vehicle leveling and ground anchor control system (8), a hydraulic system (9), a hydraulic ground anchor fixing system (7) and a supporting foot balancing system (5). Through the highly integrated and modular design, the four functions of plate loading, static sounding, spinning sounding and dynamic sounding are integrated, and the key problems that traditional foundation testing equipment is dispersed, low in efficiency and poor in data comparability are solved.
Owner:RES INST OF HIGHWAY MINIST OF TRANSPORT
A load rail vehicle for flat plate load test
The present invention provides a load rail vehicle for flatbed load testing, comprising a set of rails, a vehicle body, and a load unit. The vehicle body comprises a carrier plate and rail wheels, the rail wheels being clamped between the upper guardrail and the bottom plate of the rails, and the vehicle body being moved along the rails via the rail wheels. An anchor rod fixing device is mounted on the carrier plate, the anchor rod fixing device comprising an insertion rod device and a hammer rod device, the anchor rod being able to slide along an anchor rod hanging groove into a nail placing box, the hammer rod device comprising a hammer rod guide frame, and power hammers being mounted at both ends of the crossbar, and the anchor rods being nailed into the soil by the power hammers, thereby completing the fixing of the rails. The load rail vehicle for flatbed load testing provided by the present invention does not require the construction of an additional complex fixing frame to provide a reaction force, and is automatically fixed to the ground by anchor rods, thereby simplifying the site layout process and saving time and manpower. The present invention significantly improves construction efficiency and shortens the entire test cycle through automated processes, such as the automatic hanging, insertion, hammering, and removal of anchor rods.
Owner:CNNC SURVEY DESIGN & RES CO LTD +1
Apparatus for plate load testing and method for conducting plate load testing
To provide a plate load testing apparatus and a plate load testing method that can accurately perform a plate load testing by applying the required weight for the plate load testing. [Solution] The plate load test apparatus (100) of the present invention comprises a load loading device (20) for applying a load, the load loading device (20) having a plate holding part (2) for holding a plate (1) used in a plate load test, the plate holding part having two plate guides (3) for guiding the plate (1) held on the side of the load loading device when it is lowered, each of the lower ends of the plate guides (3) has a taper (3A), and in the area between the two plate guides (3) there is a load pipe (4) which has the function of applying the weight of the load loading device to a load cell (9) used in a plate load test, and a winch (10) which lowers and raises the plate (1) along the plate guides (3).
Owner:KAJIMA ROAD +1
Bottom plate partition variable stiffness leveling design method, system and equipment and storage medium
The invention discloses a base plate partition variable stiffness leveling design method, system and device and a storage medium. The design method comprises the steps that S1, a calculation model is established; s2, arranging a nonlinear spring; s3, carrying out stiffness iterative calculation; s4, partition variable stiffness adjustment of the bottom plate is carried out; and S5, foundation rigidity compensation. According to the method, the pain point of traditional linear spring hypothesis and conservative design is solved, field in-situ plate load test data are obtained to construct a nonlinear spring model, the foundation rigidity is dynamically matched with the actual stress state, multiple times of rigidity iteration are conducted, the spring rigidity is dynamically adjusted along with sedimentation and counter force till convergence is achieved, it is ensured that the internal force and deformation calculation result is accurate, and the method is suitable for large-scale popularization and application. The rigidity of a high-deformation area is enhanced in a targeted mode and the rigidity of a low-deformation area is weakened according to deformation deviation subareas, meanwhile, a transition area is arranged to avoid sudden rigidity change, deformation is controlled, materials are saved, the area with insufficient bearing capacity is identified through counter-force verification, only foundation treatment or deep foundation design is conducted on a key area, and waste of large-area reinforcement is avoided.
Owner:HUATIAN NANJING ENG & TECH CORP MCC +4
Fabricated flat plate load test system with length-adjustable force transfer columns
ActiveCN223856911UFoundation testingMaterial strength using tensile/compressive forcesPlate load testClassical mechanics
The utility model discloses an assembly type flat plate load test system with length-adjustable force transmission columns. The test system comprises a rigid frame type steel beam ballasting platform, a plurality of column pieces, a pressure sensor, a jack and a bearing plate, the jack is placed on the surface of the bearing plate, a plurality of column pieces are connected end to end to form a force transmission column, one end of the force transmission column is connected with the top of the jack, and the other end of the force transmission column is connected to the bottom of the rigid frame type steel beam weight platform. The pressure sensor is arranged between one end of the force transmission column and the top of the jack.
Owner:FOSHAN SANSHUI DISTRICT CONSTR ENG QUALITY INSPECTION STATION
Adjustable force transmission column device for deep flat plate load test
ActiveCN224215036Uavoid replacementAdapt to test needs of different depthsMaterial strength using tensile/compressive forcesMaterial strength using steady bending forcesPlate load testStructural engineering
The utility model belongs to the technical field of deep flat plate load tests, and particularly relates to an adjustable deep flat plate load test force transmission column device which comprises a bearing platform, a force transmission column assembly arranged at the bottom of the bearing platform, a bearing plate arranged at the bottom of the force transmission column assembly, and a plurality of groups of short columns. The short column comprises a first hollow rectangular shell and a second hollow rectangular shell, the opposite sides of the first hollow rectangular shell and the second hollow rectangular shell communicate with each other, a first rectangular reinforcing frame is arranged at the bottom of the first hollow rectangular shell, and a rectangular sliding groove enabling the first rectangular reinforcing frame to slide is formed in the top of the second hollow rectangular shell. An electric telescopic rod is arranged on the inner wall of the top of the first hollow rectangular shell, and the telescopic end of the electric telescopic rod is connected with the inner wall of the bottom of the second hollow rectangular shell. The device not only can adjust the height, but also can provide excellent axial bearing capacity, flexural rigidity and overall stability in an extension state, so that the load transmission precision is ensured.
Owner:FUJIAN DESHENG ENG TESTING CO LTD
Method suitable for rapidly measuring bearing capacity of shallow silty clay natural foundation
The invention provides a method suitable for rapidly measuring the bearing capacity of a shallow silty clay natural foundation, which comprises the following steps: S1, establishing a load-settlement displacement curve based on a plate load test (PLT); s2, considering the safety margin, and determining a permissible value of the bearing capacity of the foundation by adopting a double tangent method; s3, based on a light cone dynamic penetration test (DCPT), a regression analysis method is adopted to establish the relation between the cumulative penetration times and the cumulative penetration depth; s4, a dynamic penetration index (DCPI) is introduced, and a relational expression between the dynamic penetration index and the permissible value of the foundation bearing capacity is established; and S5, according to a light cone dynamic penetration test, rapidly measuring the bearing capacity of the foundation by utilizing the relational expression. Compared with a traditional in-situ test method, the problems that the site is limited, the test range and space are insufficient and the like can be effectively solved, meanwhile, the method is simple, convenient and efficient, the test working efficiency is greatly improved, the cost input is reduced, and a new technical means is provided for better and faster determination of the foundation bearing capacity.
Owner:ZHONGXIANG OVERSEAS CONSTR DEV CO LTD +1
Flat plate load test support unit and structure and method of use
The present application relates to the technical fields of structural engineering, and discloses a flat plate load experiment supporting unit, a supporting structure and a using method, which comprises a supporting column and an inclined rod, the two ends of the inclined rod are provided with elbows, a plurality of inclined rods are grouped into two, the inclined rods in the same group are arranged in cross, and the elbows of the same inclined rod pass through the holes on the first groove and the second groove, so that the first supporting piece and the second supporting piece are supported by the inclined rod; in use, first, according to the site conditions, the appropriate height interval is selected to select the appropriate hole, the distance between the bottom surface of the first supporting piece and the top surface of the second supporting piece is determined, then the inclined rods are arranged in two groups, the inclined rods in the same group are arranged in cross, and the elbows at the two ends are respectively inserted into the holes corresponding to the positions on the first groove and the second groove, so that the technical problems of the existing flat plate test supporting structure, such as heavy weight, large volume, complicated disassembly and assembly and increased measurement error, are solved.
Owner:GUODIAN SUZHOU SECOND THERMAL POWER CO LTD +2
The Method and Displacement Detector for Excluding Dowel Bending Affecting the Accuracy of Spiral Plate Load Test
ActiveCN105507226BMature method of operationWide adaptabilityIn situ soil foundationGratingPlate load test
The invention provides a method for eliminating the impacts of dowel bar bending on the accuracy of the spiral plate load test and a displacement detector used in the same. The method and the displacement detector have the beneficial effects and advantages that the problem that the accuracy of the spiral plate load test is impacted by dowel bar bending can be completely eliminated by arranging the displacement detector for detecting the sinking displacement of a spiral bearing plate underground, namely the bottom end of a hollow dowel bar; a linear capacitive grating displacement transducer is adopted for displacement detection; moving and static grating polar plates of the linear capacitive grating displacement transducer are respectively arranged on a hollow force transfer shaft and a drive joint of the displacement detector; during measurement, the position of the drive joint is fixed, that is, the static grating polar plate is fixed, and the moving grating polar plate moves with loading of the hollow dowel bar, thus the displacement of the spiral bearing plate can be accurately detected; a drilling machine is adopted as a rotary pressure device acting on a casing pipe; an oil jack is adopted as a loading device of the hollow dowel bar; the method has the characteristics of mature operation method and extensive adaptability.
Owner:铁三院(天津)工程有限公司
An indoor plate load test device and method considering the influence of foundation burial depth
The present invention discloses an indoor flat plate load test apparatus and method that considers the influence of foundation burial depth. By integrating a flexible airbag, a reaction frame, and a foundation pressure plate, the present invention cleverly simulates the stress of the surrounding soil under the influence of foundation burial depth through gas stress. The apparatus is ingeniously designed and simple to operate. The present invention can simulate the stress of the surrounding soil caused by the foundation burial depth, thereby enabling indoor flat plate load tests under the influence of foundation burial depth to be conducted. This allows for the study of the bearing characteristics and failure modes of foundation soil under different foundation burial depths, making the results of indoor flat plate load tests more consistent with engineering practice and the results and conclusions more valuable for reference.
Owner:GUANGZHOU UNIVERSITY
Man-induced load test system based on force plate
InactiveCN103954393BMake the transitionThe test result is accurateMeasurement of force componentsData processing systemPlate load test
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Electromagnetic type dynamic plate load test detecting device and method
ActiveCN103225320BMeet the functional requirements of the load testEasy to carryFoundation testingMaterial strength using repeated/pulsating forcesPlate load testControl system
The invention claims an electromagnetic type dynamic plate load test detecting device and a method. The device disclosed by the invention is characterized in that an electromagnet assembly, an impacting rod and an impact seat plate assembly are respectively arranged above an external sleeve, in the external sleeve and under the external sleeve; a plurality of levels of electromagnet accelerating coils are arranged on the inner side wall of the external sleeve; the levels of electromagnet accelerating coils are respectively in external connection with a circuit control system; the impact seat plate assembly comprises an impact seat and a bearing flat plate; the bearing flat plate is fixed at the bottom of the impact seat; the impact seat plate assembly is statically arranged; the external sleeve is sleeved into the impact seat; and the method disclosed by the invention is characterized by realizing acceleration of the impacting rod by discharging via the plurality of levels of electromagnet accelerating coils in the process of impacting the impact seat via the impacting rod in order to improve the impact energy and speed. By adopting an electromagnetic type graded accelerating impact rod in the device disclosed by the invention, the impact energy and the speed of the impacting rod can be effectively improved; the realized impact force is more than 1000 times to the weight of the impacting rod; and electric supply is taken as a dynamic source, so that the device disclosed by the invention can be better applied to vertical and horizontal foundation plate load test detection.
Owner:北京双杰特科技有限公司
Testing method for compactness of pre-paved ballast bed
ActiveCN109137648BReduce influence errorEasy to operateMeasuring apparatusPlate load testStructural engineering
The invention relates to the field of foundation compactness testing, in particular to a method for testing compactness of a pre-paved ballast track bed, including the steps of carring out plate loadtest on test surface of test site to obtain foundation coefficient K of the test surface of test site, and substituting foundation coefficient K into polynomial regression equation p=AK2+BK+C to obtain compaction density po. The polynomial regression equation is obtained by the following steps: carrying out plate load test on a plurality of samples taken from the test site to obtain the foundationcoefficient K = theta / S; testing the above samples by both irrigation and sand pouring methods, and then obtaining the average value of the results of the two tests to obtain the compaction density Rho; taking the foundation coefficient K and compaction density Rho as the transverse and longitudinal coordinates respectively to establish the coordinate system, and fitting the discrete points linearly to obtain the polynomial regression equation. The invention has the advantages of high operability, less external influence factors, reduced volume deviation of the quantity test pit and the probability of test deviation, and accelerated compactness test speed.
Owner:CHINA RAILWAY 21TH BUREAU GROUP
Device and method for plate load test capable of simulating side load
Owner:甘肃中建市政工程勘察设计研究院有限公司