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Hybrid fiber reinforced ultrahigh-performance geopolymer concrete as well as preparation method and application thereof
The invention relates to hybrid fiber reinforced ultrahigh-performance geopolymer concrete as well as a preparation method and application thereof. Slag, metakaolin and silica fume are used as precursor materials of geopolymer concrete, a sodium hydroxide-water glass solution is adopted to compound an alkali activator, and steel fibers, polyvinyl alcohol fibers and modified glass chopped fibers of different sizes are mixed and doped, so that the brittleness of the geopolymer concrete is remarkably improved, and the service life of the geopolymer concrete is prolonged. The early strength and the high temperature resistance are improved. The hybrid fiber reinforced ultrahigh-performance geopolymer concrete has the characteristics of low carbon emission, ultrahigh strength, high temperature resistance, high durability and the like, and can meet the use of the geopolymer concrete in actual engineering. According to the ultrahigh-performance geopolymer concrete, solid waste resources are utilized at the same time, carbon emission in the concrete production process is reduced, and the ultrahigh-performance geopolymer concrete is environmentally friendly, low in carbon, ultrahigh in strength, easy to prepare and capable of being suitable for complex environmental engineering structures such as tunnels, bridges and high-rise buildings.
Owner:TONGJI UNIV
Bridge crack monitoring method and system fused with multi-source sensor data
ActiveCN119293523Aaccurately determineeasy to understandMeasurement devicesCharacter and pattern recognitionData setData mining
The invention provides a bridge crack monitoring method and system fusing multi-source sensor data, and relates to the field of data processing. According to the method and the device, the generality measurement value matrix used for determining the position of the standard crack data in the bridge multi-mode sensing monitoring data set can be constructed according to the generality measurement between each sensing monitoring sequence in the bridge multi-mode sensing monitoring data set and each sensing monitoring sequence in the standard crack data; similar sensing monitoring sequences included between a bridge multi-mode sensing monitoring data set and standard crack data can be directly displayed on the basis of the constructed generality metric matrix, and if the generality metric matrix comprises a locking arrangement mode constructed by matrix units marked by significant features, the locking arrangement mode of the bridge multi-mode sensing monitoring data set and the locking arrangement mode of the standard crack data set can be directly displayed. The method can determine that the bridge multi-modal sensing monitoring data set comprises the standard crack data, and can accurately determine the distribution condition of the standard crack data in the bridge multi-modal sensing monitoring data set based on the locking arrangement mode included in the generality metric value matrix.
Owner:CHINA RAILWAY SOUTHWEST SCI RES INST CO LTD +1
Power generation device utilizing bridge vibration and bridge
InactiveCN119448822Alarge amplitudeincrease amplitudePiezoelectric/electrostriction/magnetostriction machinesBridgesElastic componentBridge vibration
The invention relates to the technical field of bridge accessory structures, and provides a power generation device using bridge vibration and a bridge, the power generation device comprises a first piezoelectric part and a second piezoelectric part, the first piezoelectric part and the second piezoelectric part are both located in a cavity of a bridge body, and the first piezoelectric part and the second piezoelectric part are arranged in the cavity. One side of the first piezoelectric component is connected with one side of the second piezoelectric component, the other side of the first piezoelectric component is connected to the side wall through a first elastic component, and the other side of the second piezoelectric component is connected to the side wall through a second elastic component. The deformation directions of the first elastic component and the second elastic component are parallel to each other, the second piezoelectric component is compressed when the first piezoelectric component is stretched, and the second piezoelectric component is stretched when the first piezoelectric component is compressed. The device can generate power through vibration generated by the bridge, the power generation efficiency can be improved, and the continuity and stability of power generation are guaranteed.
Owner:SICHUAN VOCATIONAL & TECHN COLLEGE OF COMM
A bridge crack detection device
Owner:CHINA RAILWAY NO 9 BUREAU GRP NO 1 CONSTR CO LTD
Structure for improving flutter stability of flat box girder and working method thereof
The invention discloses a structure for improving flutter stability of a flat box girder and a working method thereof, the structure comprises a box girder body and tuyeres located at the two ends of the box girder body in the transverse direction of a bridge, the tuyeres are connected with the box girder body through linear driving mechanisms, and the linear driving mechanisms are used for driving the tuyeres to move in the transverse direction of the bridge. The working method comprises the following steps: monitoring the actual wind speed of a bridge location in real time; if the actual wind speed is smaller than the set threshold value, the linear driving mechanism drives the tuyeres to contract inwards in the transverse direction of the bridge; and if the actual wind speed is larger than the set threshold value, the linear driving mechanism drives the tuyeres to stretch outwards in the transverse direction of the bridge. According to the structure for improving the flutter stability of the flat box girder and the working method of the structure, the problem that in the prior art, a flat box girder structure is difficult to achieve good balance between the flutter stability and the vortex vibration performance is solved, and the pneumatic configuration of the flat box girder is actively controlled; and development and application of the flat box girder technology are promoted.
Owner:SOUTHWEST JIAOTONG UNIV
Soil settlement monitoring method and system
The invention provides a soil settlement monitoring method and system, and belongs to the field of soil monitoring, and the method comprises the steps: dividing a monitoring region into a plurality of non-uniform three-dimensional grid units, and determining the risk levels of the three-dimensional grid units through a geological parameter critical value and a spatial proximity effect, the risk levels being high, medium and low; sensor groups are set for the three-dimensional grid units divided into the risk levels, data of the sensor groups are collected in real time, and the sensor groups specifically comprise vibrating wire settlement meters, pore water pressure sensors, throw-in type water level meters and MEMS tilt angle sensors; and inputting the real-time feature vector obtained by each three-dimensional grid unit into a trained XGBoost-Light model, and carrying out early warning and response of different levels according to the output risk levels. According to the soil settlement monitoring method and system provided by the invention, the accuracy of soil settlement monitoring is improved.
Owner:CHINA NORTH SURVEY DESIGN & RES INST OF ORDNANCE IND CO LTD
Method and system for carbonating concrete structure
To provide a system and method that safely carbonates a concrete structure with high efficiency and can easily estimate a carbonation degree.SOLUTION: The system comprises a carbon dioxide source, a pump, a first flow meter and a first concentration meter. The carbon dioxide source is constituted to store carbon dioxide contained gas. The pump is constituted to convey the carbon dioxide contained gas. The first flow meter and the first concentration meter are constituted to measure a flow rate of the carbon dioxide contained gas and a carbon dioxide concentration, respectively. The pump, the first flow meter, and the first concentration meter form a circulation path of the carbon dioxide contained gas by connecting them to each other. The carbon dioxide source is arranged on a first flow path branched from the circulation path. The circulation path is constituted to penetrate a concrete structure.SELECTED DRAWING: Figure 1A
Owner:FUJITA CO LTD
Transverse prestress structure of midspan bottom plate of variable cross-section box girder
The utility model provides a cross-section-variable box girder midspan bottom plate transverse prestress structure, and belongs to the technical field of box girder construction. Comprising a top plate, flange plates are arranged on the two sides of the top plate, top plate transverse prestressed steel beams are arranged below the top plate, vertical prestressed tendons and webs are arranged between the top plate and the flange plates, and bottom plates are connected to the lower portions of the vertical prestressed tendons and the webs and provided with bottom plate transverse prestressed steel beams and bottom plate longitudinal prestressed steel beams. And the bottom plate transverse prestressed steel beams and the bottom plate longitudinal prestressed steel beams are tensioned. By applying transverse prestress to the midspan bottom plate of the variable cross-section box girder, splitting force and other transverse force generated by longitudinal prestress of the bottom plate are eliminated, the bottom plate is prevented from generating longitudinal cracks, and it is guaranteed that the structure is safe and durable; diseases such as cracking and overlarge downwarping of the variable cross-section box girder can be greatly avoided, and the service life of the structure is prolonged.
Owner:CHANGAN UNIV +1
Bridge safety early warning method and device and electronic equipment
PendingCN119314306AReduce monitoring costsSimplify monitoring stepsRoad vehicles traffic controlBridgesSimulationTraffic congestion
The embodiment of the invention provides a bridge safety early warning method and device and electronic equipment, and the method comprises the steps: obtaining the amplitude information of a plurality of target point locations and the traffic flow information of a target bridge segment based on a preset wave beam, and enabling the traffic flow information to comprise the vehicle passing number information and / or the vehicle passing speed information; according to the amplitude information, continuous frame deflection track information is generated, according to the traffic flow information, continuous frame target statistical information is generated, and the continuous frame target statistical information comprises traffic quantity statistical information of continuous frame target vehicle types, continuous frame vehicle traffic speed statistical information and / or continuous frame traffic congestion degree statistical information; and according to the continuous frame deflection track information and / or continuous frame target statistical information, generating target bridge section safety early warning information. According to the invention, the artificial participation degree in the bridge monitoring process is reduced, the bridge monitoring cost is reduced, the bridge monitoring steps are simplified, and the bridge monitoring efficiency and precision are improved.
Owner:BEIJING SCI & TECH RUIXING ELECTRONIC TECH CO LTD +1
Bridge deflection reconstruction method and system based on time multi-scale feature fusion
The invention provides a bridge deflection reconstruction method and system based on time multi-scale feature fusion, relates to the technical field of micro expression recognition, and aims to solve the problems that the existing monitoring technology is easily influenced by environmental variables, only depends on long-term stable reference points, is inaccurate in monitoring data and is low in model reconstruction precision. The method comprises the steps of obtaining health monitoring data of a bridge, wherein the health monitoring data at least comprise strain data and vibration data; preprocessing the health monitoring data; inputting the preprocessed strain data and vibration data into a strain feature extraction module and a vibration feature extraction module respectively, and extracting strain features and vibration features respectively; and inputting to a fusion feature extraction module for fusion to obtain a reconstruction deflection. According to the method, the problems that the method is easily influenced by environmental variables and can only depend on long-term stable reference points are solved, the limitation of a traditional monitoring means is avoided, and accurate reconstruction of the bridge deflection is achieved under the condition that extra hardware cost is not increased.
Owner:CHINA GEZHOUBA GRP HIGHWAY OPERATION CO LTD +5
Hollow form for precast segment girder and manufacturing method of precast segment girder
To provide a hollow form for a precast segment girder and a manufacturing method of the precast segment girder, which can efficiently manufacture a cross section reverse U-shaped precast segment girder capable of easily recognizing aging degradation by visual inspection, a static image, a moving image or the like.SOLUTION: A hollow form 100 for a precast segment girder is for forming a hollow part (21) of a cross section reverse U-shaped precast segment girder (2) where an opening groove (22) is formed by opening a lower part of the hollow part (21) like a groove. The hollow form 100 is partitioned into multiple narrower width pieces than the width of the opening groove (22), and is constituted to be able to remove a form by extracting each piece among the multiple pieces of the hollow form 100 from the opening groove (22) after concrete placing.SELECTED DRAWING: Figure 6
Owner:WEST NIPPON EXPRESSWAY CO LTD +2
I-shaped steel for bridge
The utility model belongs to the technical field of steel structures, and particularly relates to I-shaped steel for a bridge, which comprises an I-shaped steel body, a plurality of holes are uniformly distributed on a web of the I-shaped steel body, and foamed aluminum is filled in each hole. A plurality of reinforcing ribs are further arranged on a web of the I-shaped steel body, the reinforcing ribs and the holes are distributed in a staggered mode, every two adjacent I-shaped steel bodies are connected through a connecting mechanism, the holes are of a hexagonal structure and evenly divided into a plurality of groups, and the multiple groups of holes are evenly distributed in the length direction of the I-shaped steel body. The plurality of groups of holes and the plurality of reinforcing ribs are alternately distributed; according to the utility model, the plurality of holes are formed in the I-shaped steel body, and the foamed aluminum is filled in each hole to form a'metal framework + core material 'composite structure, so that compared with a solid web, the weight is reduced by 25%-30%, and the flexural rigidity is improved at the same time; the adjacent I-shaped steel is connected through the connecting mechanism, and detachable connection is achieved.
Owner:PUKAISHENG TECHNOLOGY (NANJING) CO LTD
Steel box girder
The utility model relates to the technical field of steel box girders, in particular to a steel box girder, which is characterized in that the structural stability of a steel box girder body is improved through a supporting structure, the adjacent steel box girders can be conveniently and quickly positioned and connected through a connecting structure, and the stability and the practicability of the device are improved; comprising a supporting structure and a connecting structure, and the connecting structure is installed on the supporting structure.
Owner:SHANDONG DONGZHENG STEEL STRUCTURE CO LTD
Prefabricated, assembled and formed small box girder structure
The utility model discloses a prefabricated assembled small box girder structure which comprises a prefabricated open girder body and a prefabricated top plate, a connecting piece is arranged on the top face of a web of the prefabricated open girder body, a fixing hole is correspondingly formed in the bottom face of the prefabricated top plate, a guiding piece is arranged in the prefabricated open girder body, and a positioning piece is correspondingly arranged on the bottom face of the prefabricated top plate. When the prefabricated open beam body and the prefabricated top plate are hoisted and spliced, the guiding piece and the positioning piece are matched to pre-position the prefabricated open beam body and the prefabricated top plate, so that the relative position of the prefabricated open beam body and the prefabricated top plate can be limited, and the connecting piece and the corresponding fixing hole can keep the relative position in the lowering process of the prefabricated top plate; and the situation that the connecting piece cannot enter the corresponding fixing hole position and is extruded and damaged is not prone to occurring.
Owner:SOUTHWEST MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE OF CHINA
MANUFACTURING AND ASSEMBLY PROCESS OF A TRANSPORT SYSTEM
Owner:UNITSKY ANATOLI EDUARDOVICH
Bridge crack monitoring method and system integrating multi-source sensor data
ActiveCN119293523Baccurately determineeasy to understandMeasurement devicesCharacter and pattern recognitionData setMonitoring methods
The present application provides a bridge crack monitoring method and system that fuses multi-source sensor data, and relates to the field of data processing. The present application can construct a commonality measurement value matrix for determining the position of standard crack data in a bridge multimodal sensor monitoring data set based on the commonality measurement between each sensor monitoring sequence in a bridge multimodal sensor monitoring data set and each sensor monitoring sequence in standard crack data. Based on the constructed commonality measurement value matrix, similar sensor monitoring sequences included in the bridge multimodal sensor monitoring data set and the standard crack data can be directly displayed. At the same time, if the commonality measurement value matrix includes a locking arrangement pattern constructed by matrix units marked with significant features, it can be determined that the bridge multimodal sensor monitoring data set includes standard crack data, and based on the locking arrangement pattern included in the commonality measurement value matrix, the distribution of standard crack data in the bridge multimodal sensor monitoring data set can be accurately determined.
Owner:CHINA RAILWAY SOUTHWEST SCI RES INST CO LTD +1
Bridge structure
The present invention improves the wind resistance performance of a long-span bridge using a bridge girder comprising two end main box girders or two end main I-shaped girders. The bridge structure of the present invention comprises a bridge girder 13 having a deck slab 21 and a main girder 22 that includes I-shaped girders 23, 24 or box girders supporting the deck slab 21 from below at both ends in the width direction of the deck slab 21, the bridge structure being characterized in that the span length of the bridge girder 13 exceeds 100 m, the total width of the bridge girder 13 is 15 m or less, the height of the main girder 22 is 1.2 m or more, the ratio W1 / H3 of the total width W1 of the bridge girder 13 to the height H3 of the main girder 22 is seven or more, and a steel material with a yield strength of 380 N / mm2 or more is used for at least a lower flange of the main girder.
Owner:JFE STEEL CORP
Floating functional unit having one or more buoyancy bodies
PCT designated stageWO2026047105A1Artificial islandsSolid waste disposalClassical mechanicsWatercraft
The invention relates to a floating functional unit, in particular a floating platform (1) or a watercraft, comprising a deck structure (2) and one or more buoyancy bodies (3a, 3b, 3c, 3d), one or more of the buoyancy bodies each comprising a rotor blade (4) or a part, in particular a longitudinal portion, of a rotor blade of a wind turbine. The invention further relates to such a buoyancy body and to a method for the production thereof from a rotor blade.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
Frame bridge structure passing through existing railway underneath
The utility model discloses an existing railway underneath passing frame structure bridge structure which comprises a plurality of frame structure bridge outer cylinder sections which are connected in series along the axis to form an outer cylinder unit, and no partition or partition exists in a cylinder body of the outer cylinder unit. A plurality of frame-structure bridge inner cylinder sections connected in series along the axis form an inner cylinder unit, the inner cylinder unit is arranged in a cylinder body of the outer cylinder unit in a penetrating mode, the interior of each frame-structure bridge inner cylinder section is divided into a plurality of inner cylinder subareas through inner cylinder plate bodies, the cylinder body of each frame-structure bridge inner cylinder section is provided with a plurality of grouting hole channels, and the grouting hole channels communicate with the inner side and the outer side of the corresponding frame-structure bridge inner cylinder section. The structure can be applied to a jacking type construction method of a large-span frame structure bridge structure, in the jacking type construction process, a construction and unearthing machine advances in the outer cylinder section of the frame structure bridge in a barrier-free mode, and the construction efficiency is improved. The frame structure bridge inner barrel section which is separated and completed in advance can be transferred to the preset position in the frame structure bridge outer barrel section, and the construction period is greatly shortened.
Owner:CCCC SECOND PUBLIC OFFICE HUAXI CONSTR CO LTD
Fabricated bridge girder box structure
The utility model relates to the technical field of bridge girder boxes, in particular to an assembly type bridge girder box structure which comprises a bridge girder box body, connecting seats are fixedly connected to the bottom and the top of the inner wall of the bridge girder box body, and the inner walls of the connecting seats are in threaded connection with positioning plates through positioning screws. The positioning plate located on the front side is fixedly connected with a front baffle, the positioning plate located on the rear side is fixedly connected with a rear baffle, a vertical plate is fixedly installed on the front side, close to the middle of the front baffle, of the front baffle, the inner wall of the vertical plate is fixedly connected with a shock absorber, and one end of the shock absorber is fixedly connected with an inserting and fixing groove plate. According to the structure, the front baffle and the rear baffle with different structures are arranged in the assembly type bridge girder box, the structures at different positions are inserted to assist in alignment and position finding, the connecting structure in the middle is used for accurately checking the positioning effect, and the rapid position finding and accurate positioning efficiency of the bridge girder box is indirectly improved.
Owner:LIAOCHENG BEIKE NEW MATERIAL TECH CO LTD
Method of manufacturing and assembling a transport system
The invention relates to the area of transport communications, particularly, to the aboveground (elevated) complex transport systems of string type, which provide high-speed cargo and passenger traffic. Transport system by Yunitski includes track structure (4) tensioned above foundation (1) in spans (2) between supports (3), which comprises aggregated extended body (5), consisting of bearing part (6), containing prestressed load-bearing member (7), and of rail cord (8) connected with it, having rolling surface (A) for motion of vehicle (9) mounted thereon. In bearing part (6) of extended body at height H, m, having variable value in span (2) between supports (3), load-bearing member (7) is fastened, with use of means of reciprocal movement and fixation of arrangement, whereas rail cord (8) is equipped with, at least, two extended longitudinal guide plates (11) of height h, m, positioned axisymmetrically to its longitudinal axis X at distance L from each other, equal to the width of bearing part of extended body. Bearing part and rail cord are configured to be reciprocally moving along the vertical Z and afterfixing to each other at design height P, m, defined by the respective dependence. As a result, high precision of positioning of rolling surfaces (A) of rail cord (8) relative to load-bearing member (7), is achieved.
Owner:UNITSKY ANATOLI EDUARDOVICH
Manufacturing Mold and Construction Method for Installing a Sump Well Inside a Prefabricated Box Girder
A manufacturing mold and construction method for setting a catch basin inside a precast box girder. The manufacturing mold includes: an inner mold of the precast box girder, an outer mold of the precast box girder, a steel bar structure of the precast box girder, and a catch basin mold; the catch basin mold includes: a top mold of the catch basin, a bottom mold of the catch basin, two end molds of the catch basin, and a neck mold of the catch basin. The top mold of the catch basin is detachably connected to the bottom mold of the catch basin. The two end molds of the catch basin are respectively arranged at both ends of the top mold of the catch basin and the bottom mold of the catch basin. A catch basin opening is formed on the top mold of the catch basin. The neck mold of the catch basin is arranged at the catch basin opening and extends outward from the catch basin opening. The catch basin mold forms a mold for the main structure of the catch basin. The detachable connection method between the top mold of the catch basin and the bottom mold of the catch basin is conducive to the assembly and disassembly of this mold, improves the turnover rate of this mold, and further improves the construction efficiency.
Owner:CHINA RAILWAY CONSTRUCTION ENGINEERING GROUP +2
Modular metal pedestrian bridge system
The invention relates to an emergency pedestrian bridge system characterized by three types of platform modules, mechanically linked together by means of hooks, resting on supports formed by tubular posts that offer minimal resistance to any potential flood current and that are fitted into a tube articulated to a platform to lock its deployment. This platform can slide vertically along the post to a desired height, so that the platform, thus positioned, adjusted, and locked, allows pedestrians to cross over an impassable area safely, with a passage width sufficient for two people to pass each other and for a person with reduced mobility to move around. Due to its weight and dimensions, as well as its quick assembly, adjustment, and locking mechanism, the system can be easily deployed by two operators in difficult and varied conditions.Figure for the abridged version: Fig.1.
Owner:METAL PASSION +1
Corrosion-resistant coating structures and steel members
To provide an anticorrosive coating structure that has a metal substrate with an anticorrosive face, of which a part is coated with a corrosion-proof metal and another part is coated with a zinc-rich coating layer, wherein the corrosion-proof metal is protected from zinc embrittlement cracking even when the corrosion-proof metal is welded, and a steel member including the anticorrosive coating structure.SOLUTION: An anticorrosive coating structure 10 includes a corrosion-proof metal 16 that coats a part of an anticorrosive face 14 of a metal substrate 12, which requires corrosion protection, and a zinc-rich coating layer 18 that coats another part of the anticorrosive face 14. Between the corrosion-proof metal 16 and the zinc-rich coating layer 18 on the anticorrosive face 14, a separation region 14A is provided to separate them. A primer coating layer 20 is also provided to coat the separation region 14A.SELECTED DRAWING: Figure 1
Owner:JFE ENGINEERING CORP
Curve type overline footbridge structure
ActiveCN224119418UMeet the requirements for convenient accessImprove connection stabilityClimate change adaptationBridgesArchitectural engineeringCantilever
The utility model discloses a curve type overline foot bridge structure which comprises a curve type overline main bridge, a first arc-shaped approach bridge, a second arc-shaped approach bridge and an arc-shaped ramp communicated with the second arc-shaped approach bridge, the first arc-shaped approach bridge and the second arc-shaped approach bridge are connected to the two ends of the curve type overline main bridge respectively, and the curve type overline main bridge comprises a plurality of continuous steel box girders connected in sequence. Each of the first arc-shaped approach bridge, the second arc-shaped approach bridge and the arc-shaped ramp comprises a double-cantilever box-type structural section and a gravity type retaining wall structural section, and an intersection connecting section of the double-cantilever box-type structural section of the arc-shaped ramp and the second arc-shaped approach bridge is a counterfort type retaining wall structural section. According to the cross-line main bridge, the counterfort type retaining wall structural section is used as the intersection connecting section, so that the connecting stability and strength of the intersection connecting section can be enhanced, and the double-cantilever box type structural section is combined with the continuous steel box girder of the curved cross-line main bridge; the reliable connection of the first arc-shaped approach bridge and the second arc-shaped approach bridge with the curved line-crossing main bridge can be ensured.
Owner:SINOHYRDO ENG BUREAU 3 CO LTD
Method for manufacturing end forms for precast concrete members and method for manufacturing precast concrete members
To provide a method for producing a precast concrete member, upon production of a precast concrete member, capable of securing the consistency of the joining edge faces of a precast concrete member at high production efficiency while eliminating a large work space, and a method for producing an end form used for the production method.SOLUTION: A method for producing an end form used for producing a precast concrete member 50 in which plural precast concrete members 50 are connected to form a precast concrete structure has: an A step of installing concrete into a form to produce a former end form 1 (10',10); and a step B of producing a latter end form 1 (20',20) using the former end form 1 (10'10) as match cast end forms.SELECTED DRAWING: Figure 3
Owner:TAISEI CORP
Design method of high-speed railway bridge capable of driving in beam
The invention relates to the technical field of rail transit, in particular to a method for designing a high-speed railway bridge with in-beam travelling, which comprises the following steps: determining the clear width and clear height of a box beam chamber, keeping the clear width and clear height of the box beam chamber constant along the length direction of the bridge, and arranging a rail on a bottom plate of the box beam; according to the designed running speed of the train and the clear width and the clear height of the box girder cavity, simulation analysis is conducted on the aerodynamic effect in the box girder cavity for the most unfavorable working condition when the train runs; according to simulation analysis results of the mechanical effect and the aerodynamic effect of the train, stress analysis is conducted on the box girder in software, then the theoretical thickness of a box girder bottom plate, a box girder web and a box girder top plate is determined, and design is completed. According to the design method, the defects that in the prior art, when a train runs in a box girder, the aerodynamic effect of an inner cavity of the box girder is obvious, stress of all positions of the box girder cavity is different, but no corresponding design method exists at present are overcome.
Owner:CHINA RAILWAY ERYUAN ENGINEERING GROUP CO LTD
Noise reduction mechanism for construction of ultra-wide steel box girder
ActiveCN222332515UImprove adsorption capacityincrease elasticityFencingNoise reduction constructionScrew threadThreaded rod
The utility model discloses a noise reduction mechanism for construction of an ultra-wide steel box girder, which belongs to the field of noise reduction mechanisms and comprises a mounting block, a plurality of bolts are in threaded connection with the side wall of the mounting block, a limiting plate is mounted at the upper end of the mounting block, and a butt joint pipe is slidably connected with the upper end of the limiting plate. The limiting plate and the butt-joint pipe are in threaded connection with a threaded rod, the end, extending out of the butt-joint pipe, of the threaded rod is in threaded connection with a butt-joint cover, the side wall of the butt-joint cover is sleeved with a protective pad and sound absorption cotton which are distributed in an array mode, and a drainage hole is formed in the lower end of the butt-joint cover. Therefore, noise can be conveniently adsorbed and rebounded, the noise reduction efficiency is improved, meanwhile, the butt joint cover and the limiting plate can be conveniently disassembled, mounting and dismounting are convenient, and the device is simple in structure and low in manufacturing cost.
Owner:ANHUI HIGHWAY BRIDGE ENG CO LTD
A method for analyzing shear lag effect of single-box three-cell section beam bridge
The application discloses a kind of single-box three-chamber cross-section girder bridge shear lag effect analysis method, belong to bridge construction control technical field.The method includes the following steps: S1. with quadratic parabola function to build shear lag warping displacement function, select the coordinate at the location of half of box girder section, i.e. the wing plate longitudinal displacement function of single-box three-chamber thin-walled box girder considering shear lag effect is obtained;S2. calculate the normal strain and shear strain of upper and lower wing plate and web of thin-walled box girder;S3. calculate the strain energy of upper and lower wing plate and web of thin-walled box girder;S4. calculate the total potential energy of single-box three-chamber girder system;S5. according to the principle of minimum potential energy, simplification is carried out using the method of partial integration, and the control differential equation set and boundary conditions of single-box three-chamber thin-walled box girder considering shear lag effect are obtained.The application discloses a kind of single-box three-chamber cross-section girder bridge shear lag effect analysis method, and the prediction result of main girder stress and deformation is more in line with actual situation, improves the accuracy of single-box three-chamber cross-section girder bridge construction process, and higher safety.
Owner:CHINA RAILWAY 21ST BUREAU GROUP FIFTH ENGINEERING CO LTD
Large-cantilever viewing platform
ActiveCN224244511UEnsure structural strengthEnsure structural safetyPublic buildingsBridgesClassical mechanicsCantilever
The utility model belongs to the technical field of viewing decks, and particularly relates to a large-cantilever viewing deck which is formed by continuously welding a plurality of steel box girders. The steel box girder comprises a bottom plate, a side plate is welded to the upper end of the bottom plate, a top plate is welded to the upper end of the side plate, a rear plate is fixedly welded to the rear ends of the top plate and the side plate, and a partition plate is welded to the bottom plate. Through the internal structural design of the steel box girders, the large-cantilever viewing platform has high strength and rigidity, the structural strength and safety of the large-cantilever viewing platform are ensured, and due to the fact that the steel box girders can be transported section by section, the transportation difficulty is reduced.
Owner:RIZHAO BISHUI CONSTR & INSTALLATION ENG DEPT