6452results about "Foundation testing" patented technology

The invention relates to a testing platform with ground and slope engineering module. Long edge at one side of the main structure side steel plate has an instrument burying hole and data leading out hole, the other side having viewing window, bottom of the rectangular structural module slot rubble and sand cushion having water pipe supply net that connects with the water tank and vacuum extraction device, one side of the short edge of the main body structural side steel plate having discharge hole, two sides of the main structural beam post overpass the latched the reverse beam, whose lower end having hydraulic jack, ball hinges and bearing plate formed servo bearing system, displacement sensor, sand pressure sensor and gap water pressure connected to form the monitoring system. It can be deployed to prevent disasters.

The invention provides an intelligent fiber reinforced plastic (FRP) anchor rod, and belongs to the technical field of safety monitoring of geotechnical engineering. The intelligent FRP anchor rod is characterized in that the rod body is sequentially equipped with a fiber-fiber Bragg grating (FBG) sensor and an FRP wrapping layer from inside to outside, wherein the fiber-FBG sensor refers to a single-mode fiber in which one or more FBGs are written, or two parallel sensing fibers (including one common single-mode fiber and one single-mode fiber in which one or more FBGs are written). In the invention, the fiber-FBG sensor respectively transmits the sensed temperature or strain optical signals to a Raman optical time-domain reflectometry (ROTDR) demodulator, a Brillouin optical time-domainanalysis/reflectometry (BOTDA/R) demodulator and an FBG demodulator through optical switch connection and conversion. The intelligent FRP anchor rod has the beneficial effects that the embedded fiber-FBG sensor integrates test advantages of an ROTDR temperature measurement technology, a BOTDA/R test technology and an FBG test technology, thus improving reliability for long-term test of ambient temperature and strain state of the anchor rod.

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.

The present invention relates to an urban underground engineering simulation test system, underground water simulation system and data acquisition system, in which the simulation box contains horizontal loading plate, horizontal loading device, vertical loading device and several layers of horizontal water inlet pipes. Said invention can implement three-dimensional simulation test of various urban underground railway engineering, tunnel and anderground cave engineering, ground base an foundation work, special underground construction method, side slope engineering and retaining wall engineering, etc.

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.

The invention discloses a method for monitoring the structure health based on a distributed strain dynamic test; the invention adopts a distributed strain transducer to build a distributed sensing network and selects to arrange a reference transducer, carries out structure system simulation state analyzing to obtain a distributed strain simulation state vector DMSV, originally takes whether a target characteristic vector Alpha changes or not as a criterion to identify structural damage, obtains the effects of being capable of rapidly, accurately and effectively capturing the structural damage and locating, and simultaneously adopts the reasonable measures of real time image display and deleting redundant data on time, thereby having the advantages of small errors, high precision, simple process and intuitionistic monitoring; the method can eliminate the interference of noise and environment under the conditions of uncertain loading and an unknown mathematical model, carry out on-line structural damage detecting and diagnosing in real time and is suitable for long period monitoring of various engineering structures, especially for the civil structure.

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.

The invention discloses a foundation base model test device capable of bidirectional loading. A force-bearing framework is a rectangular steel frame, a model slot is of a rectangular steel structure, is provided with an upper opening and is formed by welding of a box template, the force-bearing framework is sleeved at the periphery of the model slot, a horizontal actuator counterforce column is vertically erected on the left end part of the model slot, the left end of the horizontal actuator is connected with the horizontal actuator counterforce column, the right end of the horizontal actuator is connected with the top of a pile, the upper end of a vertical actuator is connected with a cross beam at the upper part of the force-bearing framework, the lower end of the vertical actuator is connected with the top of the pile through a vertical dowel steel, a row of drain valves are arranged at the lower part of the left side wall of the model slot, an inlet valve is arranged at the lower part of the right side wall of the model slot, and a water supply pipe of the inlet valve is connected with a constant-pressure water tank. Monitoring is systematic and comprehensive, embedding of monitoring instruments is relatively easy, and automatic and real-time monitoring on multiple physical quantities can be realized. The foundation base model test device disclosed by the invention can be used in conducting model tests like slope foundation, composite foundation and pile foundation.

The invention relates to a method for reinforcing a soft soil foundation at a deep mixing pile, which comprises the steps of land formation, construction layout, spray mixing and sinking, curing agent grout mixing, stirring and hoisting, repeated spray mixing and sinking, and shifting, etc.; and the main technological parameters are as follows: 0.55 to 0.75 of water-cement ratio, 0.38 to 0.75 m/min of sinking and empty stirring speed, 0.3 to 0.5 m/min of hoisting speed, 18 to 30L/min of guniting quantity and 0.5 to 0.7 MPa of guniting pressure. Compared with the existing cement mixing pile foundation reinforcing process, the method provided by the invention has the advantages of appropriate water-cement ratio, high pile quality, high strength, less reinforcing agent consumption, low cost and remarkable economic benefit, and is easy to evenly stir; and meanwhile, the method also has the following advantages: (1) the cement can be hydrated fully, and during construction, the role of the cement can be exerted completely; (2) the construction quality is easy to control and guarantee; and (3) the construction on deep piles can be performed.

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.

This invention relates to one steel concrete structure anti-erosion test method in structure engineer field, which comprises the following steps: a, sensor processing to parallel two steel bars in same materials for fixing and sticking the stress fiber grating to top end and putting one free temperature compensation fiber grating connected by the compensation fiber and sealing on shell; b, positioning the sensor and drilling it into concrete with stress fiber and temperature compensation connected to spectrum; c, monitoring by periods to test grating wave length volume and speed to infer anti-erosion degree and speed.

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.

The invention discloses a method for checking artificial embankment body and foundation sink. The method comprises that embedding a deep sink detector and a shallow sink detector with hollow tubular structures in each checking layer along one normal line at object position in the artificial embankment body, and leading measuring device or measuring medium into a measuring channel formed by the shallow sink detector and a connecting tube, to measure the position change of the shallow sink detector and measure the height strike of the upper end of the connecting tube to find out the sink of each checking layer.

The invention discloses a testing device and a testing device of an anchor-tension type retaining wall model. The testing device of the anchor-tension type retaining wall model comprises a testing groove, a main force-bearing surface cantilever retaining wall, an auxiliary force-bearing surface cantilever retaining wall, a loading system and a testing system. The main force-bearing surface cantilever retaining wall and the auxiliary force-bearing surface cantilever retaining wall are arranged inside the testing groove, the main force-bearing surface cantilever retaining wall comprises a main force-bearing surface vertical steel plate and a first horizontal steel plate which are connected with each other, the auxiliary force-bearing surface cantilever retaining wall comprises an auxiliary force-bearing surface vertical steel plate and a second horizontal steel plate which are connected with each other, the main force-bearing surface vertical steel plate is provided with a first rock bolt through hole, and the auxiliary force-bearing surface vertical steel plate is provided with a second rock bolt through hole. The loading system comprises a vertical loading structure and a prestress loading structure, the lower portion of the vertical loading structure is connected with the floor, the upper portion of the vertical loading structure is connected with the filling in a contact mode, and the prestress loading structure is connected with both sides of the main force-bearing surface cantilever retaining wall. The testing device of the anchor-tension type retaining wall model is convenient to mount and dismount, reusable and capable of reducing the cost and improving the working efficiency.

The invention provides a dam slope deformation monitoring system and method. According to the monitoring system, an unmanned aerial vehicle photogrammetry system is utilized to monitor dams in the whole reservoir area, and an encrypted monitoring area with large deformation quantity and large digital elevation difference (a steep slope) is determined; in the encrypted monitoring area, a ground-based interferometric radar measurement system is utilized to determine a first level key area with larger deformation quantity; in the first level key area, a ground-based three-dimensional laser radarsystem is adopted to select a second level key area with larger deformation quantity, a global navigation satellite system (GNSS) is adopted in the second level key area to determine a key monitoringparticle with high deformation speed, and a micro core pile is utilized to monitor and forewarn the collapse process of the key monitoring particle area. According to the dam slope deformation monitoring system and method, precise positioning of the collapse position of the dams in the whole reservoir area and integrated monitoring and early warning of space, air and ground are achieved through time seamless monitoring from slow to fast to the instant of collapse and full coverage monitoring from large area to small area to particle and from two-dimensional to three-dimensional space variation.

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.

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.

The invention relates to a foundation pile static test loading counterforce test method and weight boxes used by the same. The test method comprises the following steps: arranging a jack in fit connection with a test apparatus on the top of a foundation pile to be tested; stacking and loading balances on a bearing platform under the cooperation of an auxiliary support structure; and testing the loading bearing capacity of the foundation pile to be tested through the test apparatus in fit connection with the jack when the jack gradually jacks up the bearing platform, wherein the balances stacked and loaded on the bearing platform is the piled balance material loaded in a plurality of the weight boxes. The weight boxes which are used in the test method for loading the balance material are particularly detachable combined type weight boxes. After assembly on the site, the weight boxes can be put into use when a loading machine is used to load the local balance material such as sandstone into the boxes. The test method is simple, convenient and quick, greatly reduces the construction cost, and has high safety. In addition, the test method can be used in a random sampling test of the static test for a large-tonnage filling pile.

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.

The invention relates to a centrifugal model testing device for simulating the pressure water head change and stability of a foundation pit. The device comprises a model tank body, a water tank clapboard, foundation pit continuous wall simulation boards, a foundation pit enclosure wall inner support and a sensor, wherein the water tank clapboard is arranged in the model tank body, and partitions the model tank body into a water tank and a soil body tank; the bottoms of the water tank and the soil tank are communicated with each other; the bottom of the water tank and the inside of the soil body tank are filled with a soil body; two foundation pit continuous wall simulation boards are arranged in parallel in the soil body tank; the foundation pit enclosure wall inner support is vertically arranged between the two foundation pit continuous wall simulation boards; the sensor is arranged in the soil body. Compared with the prior art, the centrifugal model testing device has the advantages that the influence of the change of the water body pressure on the foundation pit environment effect and inrush stability is simulated through the water tank clapboard, and an intuitional testing effect is achieved.

The invention discloses a method and device for carbonizing and curing soil. The soil carbonizing and curing method comprises the steps of: stirring and mixing a soil body needing to be cured and a curing agent according to the mass ratio of (12-19): (8-1) uniformly; and then introducing carbon dioxide gas in the cured soil to carbonize the cured soil body so as to form carbonate compound cured soil. The curing agent comprises active magnesium oxide. The device used for carbonizing and curing soil comprises a carbon dioxide generator and an outer sleeve, wherein a through hole used as a carbon dioxide outlet is arranged on the wall of the outer sleeve, a carbon dioxide inlet pipe is connected to the carbon dioxide generator, the carbon dioxide outlet on the carbon dioxide generator is connected with one end of the carbon dioxide inlet pipe, and the other end of the carbon dioxide inlet pipe is positioned in the outer sleeve. A sealing film is sleeved on the carbon dioxide inlet pipe, covers the top part of the outer sleeve and extends to the exterior of the outer sleeve. A gas seal ring is arranged between the outer sleeve and the carbon dioxide inlet pipe, and positioned on the top of the outer sleeve.

The invention discloses a remodeling sample compactor of a hollow columnar torsion shear apparatus, comprising a die and a compactor. The die comprises a sample pedestal, a sample outer die, a sample inner die, an extension long barrel and an intension long barrel, wherein, the sample outer die and the sample inner die are arranged on the sample pedestal; the extension long barrel is arranged on the upper end of the sample outer die; and the intension long barrel is arranged on the upper end of the sample inner die. The compactor includes a planarization ring, a lower force transmission barrel, an upper force transmission barrel, a cover plate of a compaction barrel, a compacting hammer, a guide rod and a displacement restrictor, wherein, the planarization ring is disposed on the lower end of the lower force transmission barrel; the upper force transmission barrel is disposed below the cover plate of the compaction barrel; the guide rod is arranged on the top of the cover plate of the compaction barrel; the compacting hammer is arranged on the guide rod; and the displacement restrictor is disposed on the upper end of the guide rod. The invention has the advantages of simple usage, convenient operation and saved test time, and can prepare uniform and standard remodeling sample, thus providing significant help for remodeling sample test of the hollow columnar torsion shear apparatus.

The invention discloses an indoor power drainage consolidation testing system and method, relating to an indoor rock mechanics testing system and method. The system is composed of shock load applying device, straining three-axis pressure room, stress and strain senor, dynamic resistance strain meter, floating engineering dynamic meter, PC, and pressure frame; and the method includes the steps: (1) according to the diameter size of a sample, drilling a bore along the axis of the sample in proportion, and filling fine sand into it; (2) placing the drilled sample in the pressure room for reversal pressure saturation; (3) installing the shock load applying device on a force transferring pole, and installing the stress and strain sensor for testing aperture water pressure, shock stress and axial strain; (4) using data collector to make dynamic signal collection, transmission and recording.

The invention discloses a prestressed concrete pipe pile horizontal bearing characteristic test model and a test method. The prestressed concrete pipe pile horizontal bearing characteristic test model comprises a model groove, a bearing table used for bearing a model pile is arranged in the model groove, and the upper end of the model pile is embedded into the bearing table. A vertical pneumatic loading system exerting vertical force on the bearing table and connected with a counter force frame is arranged above the model groove. The inner side of the model groove is provided with a horizontal pneumatic loading system exerting horizontal force on the bearing table and connected with the model groove. Monitoring devices are arranged on the bearing table, the model pile and the loading system. The invention provides a test device which can well meet the requirement for load conditions of a pile foundation load test, simulate the practical working conditions of the pile foundation more truly and detect the bearing characteristics of a single pipe pile and group pipe piles under the action of horizontal loads.