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2899results about "Foundation testing" patented technology

Method and device for detecting strain/stress of pile body by prestress pipe file field static load test

InactiveCN102011415ASolving difficult problems that cannot be precisely measuredEasy to layFoundation testingBulkheads/pilesPre stressEngineering
The invention discloses a method for detecting the strain/stress of a pile body by a prestress pipe pile field static load test, comprising the following steps of: pre-burying a strain gauge in a prestress pipe pile; leading out a lead in the piling process of the prestress pipe pile; before producing the prestress pipe pile, pre-burying an additional reinforcing steel bar with the stress gauge in a reinforcing cage, leading the lead connected with the stress gauge to a near-end part of the steel reinforcing bar of the reinforcing cage along the additional steel reinforcing bar and fixing the lead, placing the reinforcing cage in which the additional reinforcing steel bar with the stress gauge is buried into a steel die produced by the prestress pipe pile and producing the prestress pipe pile according to a normal production process except high-pressure steam curing; and binding all leads of each pipe pile during piling on the fixed device at the position of the section of the pipe pile, which is close to the end part, pulling all leads of next section of pile during pile connection to the fixed device of the last section of pile from a pile cavity and fixing and leading out the leads from the end head at the top of the pile, on which a groove opening is arranged in advance. The invention is applied to the field of civil construction engineering, can be simply and conveniently operated and has high precision and favorable economy.
Owner:ZHUHAI MUNICIPAL CONSTR ENG QUALITYSUPERVISION & INSPECTION STATION +1

Apparatus and method for measuring supporting force of large diameter ferroconcrete piles

An apparatus measures a supporting force of ferroconcrete piles by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system capable of measuring a supporting force, a sinking amount and an axis load distribution on the ferroconcrete piles. The apparatus comprises: a steel plate having a predetermined thickness and diameter and including upper and lower discs having penetration holes through which concrete passes; a fixing member for separating the discs from each other by a predetermined distance; a high oil pressure cylinder for producing an oil pressure force; an oil cylinder inflation displacement measuring sensor for measuring a displacement; an upper displacement measuring rod coupled to the upper disc for measuring a displacement of the upper disc; a lower displacement measuring rod coupled to the upper disc for measuring a displacement of the lower disc; an axis load transition measuring instrument including a tremie induction tube coupled to the upper disc for guiding concrete to the penetration holes; iron elements coupled to the upper disc; a load sensor for measuring ground abrasion; and a sensor line for transferring a signal and current to the load sensor. A corresponding method is disclosed.
Owner:G TECH CO LTD A ORGANIZED UNDER THE LAWS OF THE REPUBLIC OF KOREA +2

Tunnel surrounding rock monitoring method based on multifunctional intelligent anchor rod

The invention discloses a tunnel surrounding rock monitoring method based on multifunctional intelligent anchor rods. The tunnel surrounding rock monitoring method comprises the steps of: selecting a fracture surface to be monitored for monitoring according to analysis data such as geological conditions of a tunnel, the design of a supporting structure, the surrounding environment, the vulnerability and the like; converging the anchor rods distributed at different positions of the tunnel to a fiber bragg grating demodulator by means of leading-out armored optical fibers to form a monitoring sensor network; and connecting the fiber bragg grating demodulator (which is connected with the anchor rods) with a control computer, and constructing a surrounding rock monitoring system by means of monitoring system software. The tunnel surrounding rock monitoring method is simple and reliable in principle, can be used for testing axial forces and longitudinal distribution situations of the anchor rods to obtain a surrounding rod pressure of the tunnel, and can be used for calculating an deformation amount of surrounding rocks of an excavation surface or an deformation amount of surrounding rocks of a section. The tunnel surrounding rock monitoring method can be applied to the construction monitoring during the excavation of a tunnel adopting a new Austrian tunneling method, and can be applied to tunnel deformation and stability monitoring later during the operation period.
Owner:SOUTHEAST UNIV

Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method

The invention relates to a technology for performing foundation pile quality detection and geology survey by adopting a single tube longitudinal wave method. The technology is relevant to comprehensive testing of the actual using effect of a foundation pile and is characterized in that longitudinal wave transmitting downwards along a pile body is generated by knocking the top surface of the foundation pile, the longitudinal wave velocity and pile length of the foundation pile can be accurately measured by detecting the time difference of arrival of the longitudinal wave in a sounding pipe, and the quality of pile body concrete can be judged; actual measurement on the time difference of arrival of the longitudinal wave which is transmitted from the pile side soil along the knocked pile body can be conducted in adjacent pipelines or geological bore holes, and the length of the foundation pile, the pile body quality and the chambering degree can be measured; and the wave length of a geological soil layer can be measured, the condition of the geological soil layer around the pile can be judged, and the rock-inlet condition of the foundation pile can be analyzed. By means of the technology for performing foundation pile quality detection and geology survey by adopting the single tube longitudinal wave method, a signal processor can be configured externally or inserted in on the basis of the existing low-strain ultrasonic detection devices and the like, the technology can achieve foundation pile quality nondestructive testing and geology survey, is an economic and ready-made pile foundation nondestructive testing auxiliary validation method and can remarkably improve accuracy and service level of pile foundation quality decision.
Owner:陈彦平

Opened tubular pile hammering injection and static load simulation experiment device and method

ActiveCN103953074AIncreased self-weight stressEasy to operateFoundation testingEngineeringPulley
The invention provides an opened tubular pile hammering injection and static load simulation experiment device and method. The simulation experiment device comprises a model box, a model pile, a vertical column assembly, transverse beam assemblies as well as a piling assembly and a static load assembly, wherein the model pile comprises an outer cylinder, an inner cylinder, a semicircular steel plate and a guide rod column; axial and radial sensors are arranged on the walls of the inner cylinder and outer cylinder; the vertical column assembly comprises four vertical columns which are in rigid connection with the periphery of the model box; the transverse beam assemblies comprise lower transverse beam assemblies and upper transverse beam assemblies; the pulley assembly is connected between the upper transverse assemblies. Compared with the prior art, the simulation experiment device has the advantages that a real stress filed of a soil mass can be simulated, and the friction on the inner and outer sides of the wall of an opened tubular pile can be respectively measured; the defect that in the prior art, the real load transfer process of the opened concrete tubular pile cannot be measured is overcome. Moreover, the simulation experiment device is simple to operate, and the simulation experiment method is convenient.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Pile foundation bearing characteristic model test device and method under complicated load effect

The invention discloses a pile foundation bearing characteristic model test device under a complicated load effect. The pile foundation bearing characteristic model test device comprises a model groove, a horizontal loading system, a vertical loading system and a measuring device. The model groove is made of an organic glass panel and is reinforced by channel steel. The horizontal loading system is composed of a pulley and a weight. The vertical loading system is composed of vertical channel steel, a counter-force beam, a lifting jack and a linear sliding guide rail. The measuring device comprises a minitype laser displacement sensor system which is used for measuring the horizontal displacement of a pile head and the sedimentation of a pile tip and can horizontally move along with the moving of the pile head. The measuring device further comprises a pull rope displacement sensor system which measures the horizontal displacement of a pile body. The invention further discloses the test method of the pile foundation bearing characteristic model test device. According to the pile foundation bearing characteristic model test device and method, loading is simple, the load direction is stable, the data of pile sedimentation, pile head horizontal displacement, pile body horizontal displacement and the like of a model can be accurately measured, the measured data is high in precision, and pile foundation bearing characteristic model test research under the complicated load effect can be conducted conveniently and effectively.
Owner:HOHAI UNIV

Real-time monitoring and early warning system for foundation pit engineering

InactiveCN104616433ARealize dynamic query of 3D visualizationRealize managementFoundation testingAlarmsEarly warning systemInformation analysis
The invention discloses a real-time monitoring and early warning system for foundation pit engineering. The real-time monitoring and early warning system for foundation pit engineering comprises a cloud terminal server, a field monitoring data acquisition subsystem, a digital foundation pit information analysis and management subsystem and an early warning and information publish subsystem. The field monitoring data acquisition subsystem is used for monitoring a plurality of monitoring points on the construction site in real time to obtain monitoring data, and uploading the monitoring data to the cloud terminal server. The digital foundation pit information analysis and management subsystem is used for predicting the monitoring data to generate predicted data, generating early warning information when the predicted data exceed preset warning values, and updating the early warning information to the cloud terminal server. The early warning and information publish subsystem is used for reminding staff of the situation according to the early warning information. The real-time monitoring and early warning system achieves automatic acquisition and transmission of the monitoring data, conducts prediction according to the monitoring data to generate the predicted data, generates the early warning information when the predicted data exceed the preset warning values, and reminds the staff of the situation according to the early warning information, and therefore the automatic and intelligent level of management, prediction and early warning of information of the construction site is greatly improved.
Owner:TSINGHUA UNIV +1

Method for measuring deformation of underground diaphragm wall

The invention discloses a method for measuring deformation of an underground diaphragm wall. In the aspect of data acquisition, a three-dimensional laser scanner is adopted and is capable of quickly measuring three-dimensional coordinates of the underground diaphragm wall; working base points are used as joint control points, a control network is established through the layout of deformation monitoring working base points and datum points, the underground diaphragm wall and the working base points can be simultaneously scanned, and point clouds of the underground diaphragm wall can be registered in an absolute coordinate system of the control network. In the aspect of data processing, a point cloud regular gridding modeling technology is adopted to reconstruct a three-dimensional model of the underground diaphragm wall. By comparing the three-dimensional models of the underground diaphragm wall in different periods, the deformation of all the positions of the underground diaphragm wall can be obtained. Through the method, the overall deformation of the underground diaphragm wall can be measured in the excavation process of a foundation pit, monitoring points do not need to be laid, interference on the construction is reduced, the measuring efficiency is high, and comprehensive monitoring data are provided for the excavation of the foundation pit.
Owner:TONGJI UNIV

Construction method of self-balancing method pile foundation bearing capacity test device

The invention discloses a construction method of a self-balancing method pile foundation bearing capacity test device, which is characterized by comprising the following processes of: 1, construction preparation: calculating a balance point position of self-balancing method pile measurement, determining the number of the pile measurement, drilling holes, cleaning the holes and detecting the verticality of the holes; 2, manufacturing a load box and welding the load box with a reinforcement cage; 3, mounting the reinforcement cage; 4, cleaning the holes again; 5, pouring concrete; and 6, carrying out self-balancing method detection. As the detection is directly carried out on engineering piles in some projects, in order to preventing the pile foundations from affecting the use, a grouting machine is used for filling gaps separated from pipelines and the load box with grout after the detection; therefore, the method also comprises the following process of: 7, carrying out pipeline grouting and reinforcement. According to the invention, the defects that the load box mounting time is long, the reinforcement cage floats upwards, the mud at the bottom of the load box is too thick, the pile foundations have gaps at the load box to influence the quality of the pile foundations, the construction progress is slow, and the like are overcome, and the pile foundations have good integrity.
Owner:CHINA RAILWAY NO 5 ENG GRP +1

Rotary drilling rig coordinated with percussion drill hole-forming construction method

The invention relates to a rotary drilling rig coordinated with percussion drill hole-forming construction method which comprises forming field, locating and paying off, measuring elevation, calculating rotary digging depth and installing a plurality of temperature sensors in a permanent steel protective cylinder; rechecking a pile position; rotationally digging and drilling into a tundra layer; burying a temporary steel protective cylinder; measuring the depth of a hole and checking the formed hole; burying the permanent steel protective cylinder into a non-tundra layer; pulling out the temporary steel protective cylinder and moving a machine to conduct next construction of forming the hole rotationally; secondarily locating and sampling; locating a percussion drill; punching the hole; meanwhile digging a mud pit, producing mud and pouring the mud into the hole; secondarily measuring the depth of the hole and checking the formed hole; cleaning the hole; processing a reinforcing cage and hanging the reinforcing cage; installing a guide tube and conducting a water sealing test on the guide tube; measuring sediment and pouring concrete underwater; and curing the concrete. The rotary drilling rig coordinated with percussion drill hole-forming construction method offers a feasible technical measure for socketed pile construction and road repairing on frozen earth on island shape frozen earth area at high altitude in China and has notable economic benefit.
Owner:路桥华祥国际工程有限公司

Energy pile-soil load and temperature transmission mechanism model test device and test method

The invention discloses a visual energy pile-soil load and temperature transmission mechanism model test device and test method. The device is characterized by comprising a transparent model groove, a transparent energy pile which is embedded in transparent soil of simulation pile peripheral soil and pile end soil is arranged in the groove, the transparent energy pile is hollow, the pile bottom is closed, a heat transfer pipe is arranged in the pile, the heat transfer pipe is in linkage with a cold and hot circulating mechanism, a fiber bragg grating which is used for measuring the axial force deformation and temperature changes of a pile body of the transparent energy pile is embedded on the side of the transparent energy pile, a soil pressure box used for measuring the pile bottom stress of the transparent energy pile is embedded in the pile bottom, a laser source arranged on a movable mechanism is arranged on one side outside the transparent model groove, digital cameras for observing the space of the transparent model groove are arranged on the front visual face and the lookdown face outside the transparent model groove, and the digital cameras are in linkage with a processing device through data lines. The test device is easy and convenient to operate and strong in repeatability. The similarity of the soil properties of the prepared transparent soil and the natural soil is good, and the test method can be used for exploring the energy pile-soil heat transmission mechanism and a load transmission mechanism.
Owner:HUNAN CITY UNIV

Method for detecting quality of existing building foundation piles with parallel seismic method

InactiveCN101570974AThe principle is clear and reliableNo need to know the speed of propagationFoundation testingUltrasound attenuationAttenuation coefficient
The invention discloses a method for detecting the quality of existing building foundation piles with a parallel seismic method. The method comprising the following steps: PVC pipes which are parallel to the foundation piles are embedded near the foundation piles of the existing building; an engineering seismograph is used for testing earthquake wave which is transmitted from the foundation piles along the depth direction of the PVC pipes; and the length and the integrity of the foundation piles are judged according to the first arrival time and the amplitude of the earthquake wave which is received by a detector. The detecting method has a following theory that the propagation velocity of the earthquake wave on the foundation piles is far greater than the propagation velocity on pile foundation, while the attenuation quotient is less than that of the pile foundation, when the detector is far from the bottom ends of the foundation piles, the propagation distance of the received earthquake wave in the soil is magnified, so as to necessarily extend the lag of the first arrival time and accelerate the attenuation of the amplitude, in a similar way, the positions of the defects of the foundation piles also has the same phenomenon that the first arrival time is suddenly extended and the amplitude is suddenly attenuated, therefore, by comprehensively analyzing the first arrival time and the amplitude of the earthquake wave, the length and the integrity of the foundation piles can be judged.
Owner:浙江省建筑科学设计研究院有限公司

Method for measuring pile shaft internal force and cross section displacement in vertical dead-load test of foundation pile

The invention belongs to the technical field of pile foundation quality detection in civil engineering, in particular to a method for measuring pile shaft internal force and cross section displacementin vertical dead-load test of a foundation pile. In the method, firstly, a casing is embedded on a pile shaft lengthways or holes are directly drilled on the pile shaft lengthways; a measuring systemis arranged in the casing or the drilling hole and is composed of an anchor head, a multiple position extensometer, an extension bar and a pressure pipe, wherein, the pressure pipe pressurizes to expand the anchor head so as to ensure that the anchor head is fixed in the casing or the drilling hole; after the anchor head is fixed, the multiple position extensometer measures vertical deformation between two adjacent anchor heads by the extension bar; according to a vertical displacement observation result and vertical deformation between two adjacent anchor heads, the layering frictional resistance of each soil layer, pile end supporting force and the vertical displacement of anchor head embedding cross section are calculated, and the relation of pile soil relative displacement and pile side frictional resistance is built so as to realize pile shaft internal force and cross section vertical displacement measurement. The invention has high test accuracy and favorable reliability, can replace traditional method using strain or string-wire sensors and displacement rods to measure pile shaft internal force and cross section vertical displacement.
Owner:高飞

Device for testing limited soil mass rigid retaining wall soil pressure model

ActiveCN105040754AControl loading speedControl displacement modeFoundation testingSoil massEngineering
The invention discloses a device for testing a limited soil mass rigid retaining wall soil pressure model. The device comprises a model box, loading systems, a retaining wall and a measuring system. Toughened glass is fixedly embedded in the side face of the model box, and a rigid cushion block is welded to a model box base plate. A reaction frame is arranged on the loaded side, and eight groups of clamping steel blocks are welded to a frame. The two loading systems which can work independently are installed on the reaction frame and connected with a movable retaining wall through a fixed hinge support, and fixed boundaries are installed on the specific clamping steel blocks according to the earth filling width requirements. A micro soil pressure box is embedded in the retaining wall, and a dial gage is installed at the rear of the movable retaining wall. A digital camera is placed in front of the side face of the model box. Different earth filling widths, wall soil contact surfaces and retaining wall displacement and shifting modes are simulated, changes of active or passive soil pressure are monitored, and a soil mass displacement field and slip crack faces are studied. According to the device for testing the limited soil mass rigid retaining wall soil pressure model, effective test data support can be provided for studying the soil pressure problems on the conditions of limited soil mass, and help is provided for a follow-up theoretical analysis model.
Owner:ZHEJIANG UNIV

Ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading

ActiveCN105604106AConsistent stress and strainUniform gravitational acceleration fieldFoundation testingEngineeringDisplacement control
The invention discloses an ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading. The apparatus comprises: an osmotic force system which provides continuous pressurized water for a saturated sandy soil foundation so that a uniform osmotic flow field forms in the sandy soil foundation to simulate a hyper-gravity environment; a displacement control loading system and a force control loading system that apply horizontal cyclic loadings to an offshore wind turbine superstructure model; a measuring system used for measuring water pressure before the entry into the saturated sandy soil foundation, displacements of the offshore wind turbine superstructure model and a pile model, strain of the pile model, and surface displacement of sandy soil; an uninterrupted power supply system used for powering the osmotic force system, the displacement control loading system, the force control loading system and the measuring system, thereby ensuring all systems can run stably in a long time; the invention also provides an experiment method of the apparatus; the apparatus and the method are widely applicable and suitable for various ocean engineering structures such as oil platforms and offshore wind turbines.
Owner:TSINGHUA UNIV
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