1821 results about "Structural safety" patented technology

The invention relates bridge structure safety evaluation technology by means of combining vibration measuring and structural model analysis techniques for bridge erosion evaluation and pre-warning monitoring applications. This technology can also be applied for long-term bridge structure monitoring and safety evaluation as well as judgment and evaluation of rail structure abnormality.

The invention belongs to the building support component technology field including the stress automatic control and monitoring as well as the structural safety, and relates to a steel tube supporting internal force automatic compensating and displacement controlling system. The system comprises an upper system, a PLC control system module and a field executive system. A steel support is arranged on a reinforced concrete diaphragm wall, a hydraulic jack is arranged on the steel support, and real time pressure monitoring values are fed back through a pressure sensor. The steel support and the hydraulic jack form a pre-stressed steel support structure, the hydraulic jack is connected with a hydraulic pump station through an oil circuit, and is connected with the PLC control system module through the pressure sensor, the hydraulic pump station is connected with the PLC control system module, and a PLC controlling device is connected with the upper system. Through auto-control software and a PLC control system, the automatic control to the axial force of the steel support is realized, thereby controlling the displacement and the settlement of the deep excavation supporting structure and the adjacent basic facilities.

The present invention discloses a bridge structural safety monitoring system and a bridge structural safety monitoring method. The method includes the steps of capturing an image of a monitoring area of a bridge to create a standard image of the bridge operated at normal conditions, capturing images of the monitoring area of the bridge continuously to obtain monitoring images, comparing the standard image with the monitoring image to obtain a displacement correlation coefficient of the monitoring area of the bridge, and transmitting the displacement correlation coefficient to a central console, such that the central console can determine the using condition of the bridge according to the displacement correlation coefficient.

The present invention relates to a method for measuring steel structure bridge life by utilizing fracture mechanics. It includes an ultrasonic inspection process of steel structure bridge member, and utilizes actually-measured data to correct analog data so as to raise accuracy of structural calculation. Said measurement method includes seven steps: structural mechanics modeling, mechanical model correction, traffic load modeling, traffic load correction, ultrasonic inspection, member fracture mechanics model modeling and bridge structure technical state judgment.

The invention discloses a construction method of a trestle steel pipe pile foundation. The construction method is used for performing anchoring construction for the trestle steel pipe pile foundation on a slope bare rock surface and a shallow covered slope rock surface of the river, lake or ocean. The construction method comprises the following steps: A10) after utilizing an anchoring system to accurately position a floating pilot hole platform, respectively guiding each trestle steel pipe pile to fall onto a river bed rock surface but not perform a rock anchoring, through each reserved hole position on the floating pilot hole platform; A20) after impacting a hole to a designed depth on a foundational bed rock surface in the trestle steel pipe pile by using an impacting drill with the diameter less than the inner diameter of the trestle steel pipe pile, vibrating the trestle steel pipe pile so as to guide the trestle steel pipe pile to sink to the bottom of the hole, pouring reinforced concrete and firmly connecting the trestle steel pipe pile to the foundational rock; and A30) welding a trestle steel pipe pile connecting system, thereby finishing the construction for the trestle steel pipe pile foundation. According to the construction method, the operation of drilling the pile and steel pipe pile is adopted for construction, thereby efficiently resisting the influences of water flow, wind wave and air load and ensuring the stability and structural safety of the trestle.

The invention discloses a satellite structure for platform and load integration, which relates to the technical field of aerospace and solves the problems of large system mass, large size and the like caused by low resource utilization rate and high structure redundancy of an existing satellite structure system adopting a method that a platform and a load are separately designed. The satellite structure comprises an upper plate, a center bearing cylinder, side plates, a docking ring and a bottom plate, wherein the docking ring is used as an assembling reference, the bottom plate is installed on the docking ring, the center bearing cylinder is installed on the bottom plate, the upper plate is installed on the center bearing cylinder, the side plates are fixed on the side surfaces of the upper plate and the bottom plate, a plurality of upper plate brackets are uniformly arranged in the circumferential direction of the center bearing cylinder, and the upper plate is installed on the center bearing cylinder through the plurality of upper plate brackets. The satellite structure has the advantages of compactness, small size, light weight, high structure function density, high rigidity, large structure safety margin and high reliability.

The invention relates to an on-line monitoring method for settlement and convergence in building construction and operation periods, in particular relates to a laser displacement sensor-based on-line monitoring method for the settlement and the convergence in a construction process and an operation period of vault crowns and haunches of tunnel and subway buildings, and belongs to the fields of building and highway engineering, and applied to the industry of structural safety and health monitoring. The online monitoring method disclosed by the invention can be used for solving problems of complex installation, expensive equipment, great outside influence on the structure, high requirement on installation and using environments and the like in known methods for on-line monitoring of the vault crown settlement of tunnels and subways in construction and operation periods.

A workbasket assembly for surrounding and protecting a workman when cleaning or maintaining a tall structure such as a building, tank or silo. The workbasket assembly comprises a frame made up from a plurality of vertical uprights and horizontal rails connected together by a plurality of pivot tabs. The workbasket assembly may be collapsed for storage or transport purposes or so that it may be passed through a relatively small aperture in a structure such as a tank. When expanded, the workbasket assembly is engageable with a hoist-operable base that permits the workman to be safely raised or lowered relative to the structure being maintained. The frame is only movable to the fully collapsed condition when detached from the base. The workbasket assembly can be expanded and collapsed without the use of any tools.

The invention relates to a construction process for installing an elastic slippage shock isolation support. The construction process comprises the following steps of: preparing construction, locating and unwinding, binding a reinforcing steel bar under the support, reserving a secondary pouring concrete construction line under a shock isolation support embedded plate, building a dabbing-free template, pouring and maintaining the concrete, locating and unwinding, clearing up a concrete base layer, installing and fixing a lower embedded plate, contracting and compensating the pouring and the maintenance of the concrete, detecting the position of the lower embedded plate of the support and preventing corrosion, installing the shock isolation support and an upper embedded steel plate, installing a temporary protective facility of the support, installing an upper component template of the support and binding the reinforcing steel bar, pouring and maintaining the concrete of the upper structure, dismantling the temperature, installing a permanent protective facility of the support, and checking and accepting the support. By the construction process, the key technology for installing construction of the elastic slippage shock isolation support is provided, the installing quality is guaranteed, the shock isolation technology can be popularized in high-intensity shock-proof protective areas, the project cost is reduced, the structural safety performance is enhanced, and the social and economic benefits are remarkable.

The invention relates to a holed excavation supporting structure for a light and dark junction section of a tunnel in a bias pressure state and a construction method. In a supporting mode combining a bias pressure earth retaining wall and a cover arch, the unilateral bias pressure of the tunnel is balanced, thus ensuring the safety of a tunnel structure and safe holed excavation of the tunnel. With the adoption of the holed excavation supporting structure and the construction method, a slope is prevented from being destroyed in large area due to open cut tunnel excavation, and original ecological vegetation is protected to keep the slope intact and avoid landslip due to heavy excavation, so that neither engineering construction or environmental protection is neglected, and the engineering cost is also greatly lowered. The holed excavation supporting structure and the construction method can be widely applied to tunnel building in a mountainous hilly area.

The invention provides an optical fiber sensing method which takes a full-scale distribution type and has locally and highly precise collineation, and a system of the optical fiber sensing method comprises the parts of a Brillouin sensing demodulation device, a fiber grating demodulation device, an optical switch (or a coupler) and an FRP-FBG-OF sensing probe, etc. One or a plurality of fiber gratings are written onto an ordinary single mode fiber with arbitrary length and made into the sensing probe through the encapsulation of FRP, and the sampling optical switch or the coupler is respectively connected with the fiber grating demodulation device and a Brillouin distributed testing system, thus forming an intelligent sensing monitoring system which implements the large-scale, full-distributed and locally and highly precise testing of structural damage, achieves the full-scale damage positioning and quantitative testing of important projects and the mutual checking effect, and provides complete, direct and reliable information for structural safety evaluation. The optical fiber sensing method is especially applicable to structural damage monitored objects which are characterized by wide distribution range, long distance and concealed position, etc., and has the advantages of compact system, low cost, strong operability, good stability and durability and reliable result, etc.

The present invention relates to safety monitoring system, and is flexibility monitoring method for large span bridge structure. Whole bridge pressure field is first established with water tanks set in the unchanged location, water pipes set horizontally and city water supply system to lead water pressure to deformation location of the bridge; and the pressure transducer is fixed to the measured part. The pressure change is converted into flexibility change and monitored with the computerized monitoring system, which consists of water tank, water pipes, pressure transducer, A/D converter, computer, etc. The present invention has high measurement stability, great measurement range, low measurement cost and high practical value.

The invention provides a structure safety evaluation method under the action of environmental loads of a space steel structure. The structure safety evaluation method under the action of the environmental loads of the space steel structure comprises the steps that S1, environmental load partitioning is conducted on the structure on the basis of existing monitoring data; S2, a method for determining values of non-uniform distributed loads on structure partitions is determined; S3, a structural stress monitoring data evaluation threshold is set; S4, simulation analysis of structural stress field distribution under the action of the actual environmental loads is conducted through operation of finite element software and combination between the existing structure partitions and partition load values; S5, stress response data of the structure are extracted to be evaluated. According to the structure safety evaluation method under the action of the environmental loads of the space steel structure, good simulation of non-uniform distribution of actual temperature loads and actual wind loads of the space steel structure is achieved through utilization of existing temperature measured data and wind speed and pressure monitoring data of a health monitoring system, and therefore identification of a whole stress field under the action of the environmental loads of the structure is achieved; meanwhile, due to the fact that stress of rod pieces at measuring points and rod pieces which are not arranged at the measuring points is evaluated, the problems which can be caused in the process that whole stress safety of the structure is evaluated only through the finite stress measuring points are solved.

The invention discloses a method for constructing a beam plate supporting system having a post-cast strip. The method comprises the following steps: 1) setting up an upright rod and a horizontal rod and forming a supporting bracket, wherein the supporting bracket at the position of the post-cast strip is an independent system, 2) laying a longitudinal secondary keel on the supporting brackets at two sides of the post-cast strip and laying a lateral secondary keel on the supporting bracket at the position of the post-cast strip, and 3) arranging a template at the position of the post-cast strip on the lateral secondary keel, arranging the templates at two sides of the post-cast strip on the longitudinal secondary keel, tightly butt jointing the template at the position of the post-cast strip with the adjacent templates at two sides, and arranging the longitudinal secondary keel under the joint. The post-cast strip of the invention adopts the independent supporting system. After the brackets are arranged, no reconstruction is needed, so the reconstruction for the brackets is avoided and the human labor and materials are saved. The independent supporting system is maintained at the position of the post-cast strip all the time so as to ensure the safety of the post-cast strip.

The invention provides an acoustic emission signal sensing system based on matching-type fiber Bragg grating (FBG), which aims to overcome limitation of the prior art and introduce an FBG sensor into the acoustic emission detection field. The acoustic emission signal sensing system comprises a broadband light source, a first fiber coupler, a second fiber coupler, the FBG, a tunable FBG filter, a first photoelectric detection circuit, a second photoelectric detection circuit, an analog-to-digital conversion circuit, an FBG array (FBGA) and a computer. The acoustic emission signal sensing system is mainly applied to structural safety monitoring of an aerospace plane and damage detection of important components, and has the advantages of high sensitivity, high response speed, long transmission distance and strong resistance to electronic interference; and compared with the power-type FBG acoustic emission sensing system, the acoustic emission signal sensing system based on the matching-type FBG provided by the invention has the beneficial effects that wavelength shift information is demodulated by a matching grating method so as to obtain information of an original acoustic emission wave, the detection object is optical wavelength rather than optical power, and optical wavelength information is not affected by optical power loss during the optical transmission process, thus the detection precision is higher, the resolution power is higher and the noise is smaller.

The invention discloses a bridge safety operation monitoring and management system. The system includes a sensing unit which collects and obtains response data of a bridge structure in real time, an analyzing unit which processes and analyzes the response data of the bridge structure, an application unit which provides a user with several functions and services according to processed and analyzed data, a display unit which displays output data in the form of a graph and a report to a bridge manager, and a database and data management unit for storing and managing the data of each unit. The units transmit data and information to each other through a transmission unit, collect data and monitor influence on the performance of the bridge structure in real time, identify existing defects and quality decay of the bridge structure in time, and evaluate and analyze potential development thereof in current environmental conditions and potential threat thereof to safe operation of the bridge structure. The system provides real-time, regular and non-regular safety status information services of the bridge structure for related institutions, and provides scientific basis for decision-making of maintenance needs and measures, etc.

The invention discloses a method for calculating the vehicle induced vibration response of a railway bridge structure, and belongs to the technical field of engineering design calculation. According to the method, a stochastic problem in a field domain is converted into a definite solving mode on the time domain on the basis of a pseudo excitation method; the time-varying characteristics of a vehicle-bridge coupling system and the irregularity of a track as the self-excitation indeterminacy of a system are considered, and the obtained vehicle induced vibration response of the railway bridge structure is within a range interval; the range interval can compromise multiple stress states of the railway bridge structure, so that the accuracy of a calculating result is ensured, and the structural safety is enhanced.

The invention discloses a fabricated tunnel support system and a construction method thereof. The fabricated tunnel support system comprises main structures such as an advanced support, a flexible support and a rigid support, and all structural layers are constructed sequentially according to construction processes. The advanced support is formed by reinforcing surrounding rocks by advanced small pipe grouting, the flexible support is formed by splicing prefabricated foam concrete blocks through bolts, joints among all the prefabricated foam concrete blocks are subjected to sealed waterproofing through elastic rubber gaskets, the rigid support comprises concrete-filled steel tube arches and prefabricated reinforced concrete segments, the concrete-filled steel tube arches are vertically arranged at intervals along the circumferential direction of a tunnel, the positions among the concrete-filled steel tube arches are filled with the prefabricated reinforced concrete segments, every two adjacent concrete-filled steel tube arches are connected through longitudinal rebars, steel tubes are circumferentially connected through sleeves, and the prefabricated reinforced concrete segments are connected through bolts. The fabricated tunnel support system is simple in process, rapid in construction progress, high in quality and good in waterproof effect while tunnel structural safety is guaranteed effectively.

The invention discloses an intelligent bridge monitoring method based on traffic flow control, which is characterized in that: the traffic flow control is introduced into bridge monitoring, a method combining monitoring and forecasting analysis of vehicle load flow, forecasting analysis of bridge structural mechanics response, real-time monitoring of bridge structural safety condition and active control of the traffic flow is adopted, and a reasonable vehicle load model is established through monitoring and forecasting analysis of the vehicle load to be on a bridge so as to perform the forecasting analysis of the bridge structural mechanics response and pre-evaluation of safety condition, and control the traffic flow according to a pre-evaluation result; the bridge safety condition is comprehensively evaluated through bridge theoretical calculation and the analysis of a real-time monitoring result, and the traffic flow is controlled according to an evaluation result; and the active control of the traffic control effectively avoids the damage caused by extra bridge load, prolongs the service life of the bridge, and can reasonably control the traffic flow in an allowed range of ensuring bridge operation safety in special conditions such as strong wind, earthquake and the like.

The invention discloses a seamless bridge deck expansion joint structure for road engineering and a construction process of the seamless bridge deck expansion joint structure. The seamless bridge deck expansion joint structure for the road engineering comprises a bridge body and an expansion join, wherein concrete paving layers are arranged on the bridge body; a preserved notch is formed between two adjacent concrete paving layers; a clearance is reserved between two adjacent bridge bodies or between the bridge body and a bridge abutment; the seamless bridge deck expansion joint structure further comprises an elastic-plastic body and a backing plate; the backing plate is positioned on the bottom surface of the preserved notch for closing the clearance; the backing plate is arranged below the elastic-plastic body; the elastic-plastic body is positioned in the preserved notch for forming an elastic-plastic body expansion joint; and asphalt concrete layers are paved on the concrete paving layers and the elastic-plastic body expansion joint in a penetrating way. According to the seamless bridge deck expansion joint structure disclosed by the invention, a real seamless bridge deck can be formed; and the seamless bridge deck expansion joint structure has the advantages of higher structural safety, greater convenience in construction and convenience in replacement.

The invention relates to a buckling-restraining and strengthening system for circular steel tubes, which comprises an axial force member unit, a buckling-restraining unit and a debonding unit, wherein the axial force member unit is a member bar of which the engineering structure is to be strengthened, the invention is only applicable to the circular steel tube member bar, the member bar is subjected to buckling collapse in compression in the actual engineering and accordingly has a sharp decrease in the strength, and therefore, the member bar needs to be strengthened; the buckling-restraining unit is an external circular steel tube formed by splicing two semicircular steel tubes and is connected with semicircular steel fasteners arranged at certain intervals by bolts; the debonding unit is arranged between the axial force member to be strengthened and the spliced external circular steel tube and is made of polymeric materials of high debonding performance and certain extrusion resistance. The invention has the advantages of simple structure, convenient construction, obvious strengthening effect and the like, and can be widely used for design construction or reconstruction strengthening of the circular steel tube member bar with a compressed steel structure. By improving and controlling the carrying capacity of the member bar, the technology achieves the purposes of improving the overall carrying capacity of the structure and increasing the emergency capacity of the structure.

Disclosed is a solar power generation device capable of automatically removing snow and dust. The solar power generation device capable of automatically removing snow and dust comprises a solar photovoltaic module, a base and a rotating unit mounted on the base. The rotating unit is provided with a motor and two vertical columns; a rotatable support shaft is arranged between the two vertical columns and fixedly provided with a sleeve perpendicular to the support shaft; a rotating shaft is arranged inside the sleeve and born by two bearings at the upper end and the lower end of the sleeve; the solar photovoltaic module is fixed at the upper end of the rotating shaft; a telescopic double-cross axle type universal coupler is connected between the lower end of the rotating shaft and the output shaft of the motor. The solar power generation device capable of automatically removing snow and dust can simulate the turning actions of living beings and eliminate snow and dust on a photovoltaic battery panel through centrifugal force generated by forward and reverse rotation of the photovoltaic battery panel, thereby obtaining high snow removing effects. Compared with vibration type dust removal, the solar power generation device capable of automatically removing snow and dust has small or even no influence on structural safety of the photovoltaic module, thereby avoiding damage to the photovoltaic module as much as possible. Compared with contact type dust removal, the solar power generation device capable of automatically removing snow and dust avoids the problem of abrasion on the surface of the photovoltaic battery panel.

The invention relates to a suspended-cable steel-concrete composite-structured submerged floating tunnel and a construction method of the suspended-cable steel-concrete composite-structured submerged floating tunnel. The tunnel barrel body of the suspended-cable steel-concrete composite-structured submerged floating tunnel is a steel-concrete composite shell, the outer-contour diameter of the shell is 10 to 15 meters, a supporting frame is arranged in the tunnel barrel body, the supporting frame is formed by connecting longitudinal baffle plates and transverse baffle plates, an auxiliary passage and an air gap are formed between the supporting frame and the shell, a travelling lane is formed by the supporting frame, the travelling lane comprises two lanes, and the tunnel barrel-body part is connected with a submarine uplift pile through an anti-floating suspended cable; the steel-concrete composite shell is formed by pouring fine aggregate concrete into a position between an inner-layer steel plate and an outer-layer steel plate through spray irrigation; a transmission pipeline is laid in the auxiliary passage, and a passage is also formed by laying a baffle plate on the transmission pipeline; one auxiliary passage on the lateral wall of the tunnel barrel body is an emergency evacuation passage, and the auxiliary passage is provided with an evacuation opening; an automatic draining device and a ventilation opening are arranged at the upper part of the tunnel barrel body, and an automatic ventilating device is installed at the ventilation opening. The suspended-cable steel-concrete composite-structured submerged floating tunnel has good stability, the structural safety and the travelling steadiness of the tunnel are ensured, the construction method is simple, the tunnel is convenient to manufacture, and the usage amount of tunnel steel can be effectively reduced.