9504results about "Bridge structural details" patented technology

The invention provides a Transform and CNN fused crack detection and structure evaluation system and method. The system comprises an image preprocessing module, a crack feature extraction module, a crack positioning and classification module, a crack boundary refinement module and a structure integrity evaluation module. Through combination of the CNN and the Vision Transform, local and global features in the image can be extracted at the same time, and the precision of crack detection is enhanced. The dynamic attention mechanism is used for refining fracture boundaries and improving fracture positioning and recognition effects. And the structure health assessment module combines crack information and structure stress analysis, performs structure risk assessment by using a support vector machine or a random forest, and outputs a structure health state and a repair suggestion. The invention further provides an evaluation scheme of the system. The method improves the precision and robustness of crack detection, has higher multi-scale detection capability, noise robustness and real-time performance, and is suitable for automatic monitoring and health management of civil infrastructures.

The invention relates to the technical field of cable-stayed bridge steel anchor beam cable force optimization, in particular to a large-span cable-stayed bridge steel anchor beam cable force optimization method and system. The method comprises the steps of obtaining original data of a large-span cable-stayed bridge steel anchor beam; performing data preprocessing on the obtained original data of the large-span cable-stayed bridge steel anchor beam; capturing a long-distance error dependency relationship by utilizing Transform and predicting an accumulative error of a future segment; using the convolutional LSTM network to generate an optimal adjustment amount based on the accumulative error; and solving an optimal cable force scheme by using a cable force optimization algorithm. According to the method, the precision limitation of a traditional installation process is thoroughly changed by constructing an intelligent prediction model and a multi-dimensional closed-loop control system. Based on the error prediction technology of multi-source data fusion, the nonlinear law of error transmission can be accurately captured, the error development trend is pre-judged in advance, active compensation is implemented, and the installation deviation of the steel anchor beam in the transverse bridge direction, the longitudinal bridge direction and the elevation direction is remarkably reduced.

The invention discloses a bridge crack detection system based on bridge safety, and relates to the technical field of bridge safety detection, and the system comprises a region division module which divides a bridge structure into a key detection region and a secondary detection region according to bridge historical detection data; the data acquisition module is used for respectively arranging corresponding detection equipment in the key detection area and the secondary detection area and acquiring the number, the size and the specific position of cracks in real time, and the sizes of the cracks comprise large cracks and small cracks. The method is beneficial for determining whether the cracks which seem not to threaten the safety of the bridge can gradually evolve into potential hazards which influence the overall safety of the bridge under the combined action of the cracks and other cracks, so that more accurate and reliable technical support is provided for safety management and maintenance of the bridge.

The support comprises an upper seat plate, a spherical crown lining plate, a middle steel lining plate and a lower seat plate, the upper seat plate is fixedly installed at the bottom of a beam bottom, the spherical crown lining plate is arranged between the upper seat plate and the middle steel lining plate, the middle steel lining plate is arranged between the spherical crown lining plate and the lower seat plate, and the spherical crown lining plate is fixedly installed on the lower seat plate. The lower seat plate is fixedly mounted at the top of a bridge pier, the bottom surface of the upper seat plate is fixedly connected with a first limiting ring through a first anti-shear pin, the first limiting ring abuts against the middle steel lining plate, the top surface of the lower seat plate is fixedly connected with a second limiting ring through a second anti-shear pin, and the second limiting ring abuts against the middle steel lining plate. In a normal use state, the slip surface adopts a large curvature radius and a small friction coefficient to provide smaller damping, reduce the acting force of the support on a bridge and reduce the lifting of a beam end, and in an earthquake state, the slip surface adopts a small curvature radius and a large friction coefficient to provide larger damping, so that the shock absorption and isolation effect of the support is improved; and displacement of the bridge under the earthquake condition is controlled.

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention provides a maglev traffic track structure and a construction method thereof. The maglev traffic track structure comprises a bridge deck, a maglev track assembly and an induction plate assembly. The magnetic levitation rail assembly comprises a magnetic levitation rail, a hexagon nut, a gasket, a thin nut and a screw. The induction plate assembly comprises an iron core, an aluminum plate, shear nails and screws. The iron core is vertically welded and fixedly connected with the shear nails, the shear nails and the bridge deck are cast and anchored into a whole, the iron core is arranged on the upper end face of the bridge deck, and the aluminum plate is installed on the upper end face of the iron core through screws; the construction method comprises the steps that the prefabricated bridge deck slab is modularly poured in a factory, the magnetic levitation rail is installed, adjusted and locked in the factory, the levelness and straightness of the magnetic levitation rail are measured again, and the bridge deck slab is installed on a construction site. According to the invention, high-precision, high-efficiency and low-cost installation of the maglev traffic track is realized.

A waterfront soft soil area landscape pier precast pile comprises a concrete precast pile, the concrete precast pile comprises a pile top, a pile body and a pile tip, a steel reinforcement framework is arranged in the concrete precast pile, a drainage system and a grouting reinforcement system are arranged in the concrete precast pile, and the waterfront soft soil area landscape pier precast pile comprises a grouting pipe which longitudinally penetrates through the pile body from the pile top to the position above the pile tip. The top end of the grouting pipe extends out of the surface of the pile top to facilitate later grouting, the surface of the grouting pipe is connected with a grouting pipe branch pipe, the grouting pipe branch pipe extends out of the surface of the pile body in the radial direction, an included angle of 10-20 degrees is downwards formed between the grouting pipe branch pipe and the surface of the grouting pipe, and grout is sprayed along the inclined angle to form a mushroom-shaped reinforcing area to completely wrap the lower middle portion of the pile body. And the reinforcing area and the pile body form an integral collaborative stress body, so that the pile end resistance is further improved, and meanwhile, continuous consolidation settlement caused by excess pore water pressure is inhibited.

The invention discloses a construction method and a construction system for bridge joist pier replacement, and relates to the technical field of bridge construction.The construction method comprises the following steps that gate-type pier studs are arranged on the two sides of a to-be-replaced pier, two steel cover beams are arranged on the corresponding gate-type pier studs in the longitudinal direction of a bridge, and a sliding structure is arranged on the two steel cover beams; temporary supporting pieces are arranged on the two steel cover beams, and the bridge superstructure is supported through the temporary supporting pieces; a pier cap of the to-be-replaced pier is cut off, the pier cap is moved out through a sliding structure, and the steel coupling beam is moved to the position where the original pier cap is located through the sliding structure; and supporting the upper structure of the bridge by using the steel coupling beam, and removing the temporary supporting piece to complete pier replacement. According to the construction method, in the joist pier replacement process, the connection stability is high, the construction method is simple, and the construction efficiency and safety are ensured.

The present invention belongs to the technical field of wind-induced vibration control of bridges, and provides a one-way friction energy dissipation device for controlling the flutter of large-span bridges. The device is quickly installed before the arrival of extremely strong winds, which can temporarily and significantly improve the flutter safety of the bridge, reduce its own wind-resistant design requirements, and significantly reduce the project cost. After the strong wind, it can be easily disassembled without affecting the beauty of the bridge or interfering with navigation under the bridge. The use of one-way bearings greatly reduces the weight, transportation, loading and unloading, and storage costs of the counterweight. The device can adapt to any static wind displacement, has good robustness, is safe and reliable, economical, fast, efficient and practical, and can be shared by multiple bridges at different times, greatly reducing its own and storage costs. The device can also be used for long-term vibration control of large marine structures such as floating offshore platforms, floating wind turbines, and temporarily docked ships under the combined action of wind and waves, and wind vibration control of gentle photovoltaic structures.

Provided are a camera-array-based intelligent measurement and control method and system for an ultra-high bridge tower (1). The system is provided with a camera array monitoring module, an image capture and processing module, a monitoring apparatus, a bridge tower (1) status evaluation and prediction module, and a bridge tower (1) intelligent control and early warning module. Targets (3) are vertically arranged on a bridge tower (1), and an array camera monitors the real-time displacement of each target (3) across the full height range of the ultra-high bridge tower (1); the monitoring apparatus acquires environmental parameters and stress data; a bridge tower (1) structure status model is established in the bridge tower (1) status evaluation and prediction module to predict the future alignment change trend of the bridge tower (1); and the bridge tower intelligent control and early warning module performs real-time early warning and control on the bridge tower (1). Thus, all-weather automatic monitoring and intelligent control of the alignment of the structure of a bridge tower (1) are realized, thereby effectively improving the measurement efficiency, reducing the labor costs, ensuring the accuracy and reliability of measurement results, and thus enhancing the construction quality of the bridge tower (1).

The invention discloses a municipal bridge expansion joint detection mechanism, and belongs to the technical field of expansion joint laser detection.The municipal bridge expansion joint detection mechanism comprises a main case and heat dissipation holes formed in the corners of the main case, guide columns are fixed to the side edges of the main case, and side width check blocks are arranged on the sides of the guide columns; a reference rod fixed to the side width check block is inserted into a guide column, a laser range finder is installed in the guide column, the laser range finder detects movement of the end of the reference rod through optics, and the middle of the side width check block is connected with a movable wheel through a rotating shaft. A first cleaning assembly and a second cleaning assembly are installed on the front side and the rear side of the movable wheel correspondingly. According to the municipal bridge expansion joint detection mechanism, through the arrangement of the laser range finder, the width of an expansion joint can be accurately measured conveniently, meanwhile, fixed-point or whole-line width measurement can be conveniently conducted on the expansion joint, and silt attached to the side wall of the expansion joint can be conveniently cleaned in the measurement process.

The invention relates to the field of intelligent transportation systems, discloses an intelligent highway maintenance system and method, and aims to solve the fundamental defects that in the prior art, the data acquisition dimension is single, the maintenance decision depends on artificial experience, and prospective prediction is lacked. The method comprises the following steps: acquiring multi-modal dynamic sensing data covering a whole road domain; constructing and updating a four-dimensional space-time digital twinborn model in real time; driving the causal graph neural network model to perform structure health state prediction and diagnosis; generating an active maintenance instruction through a multi-objective optimization engine; and the autonomous maintenance execution unit is dispatched to complete unmanned closed-loop operation. According to the method and the system, fundamental transformation of road maintenance from passive response to active prevention, from artificial experience to intelligent decision making and from discrete operation to closed-loop automation is realized, and the maintenance efficiency, the safety and the health level of the whole life cycle of the road are remarkably improved.

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The construction platform comprises two moving tables symmetrically arranged on the two sides of the cylindrical pier, the two moving tables are made to be away from or close to each other through a translation driving mechanism, a supporting beam assembly shares loads of the moving tables, and a lifting driving mechanism drives the moving tables to ascend and descend synchronously. When the jacking mechanism is in place, the bottom of the supporting beam assembly is jacked to complete supporting system conversion, and the structure of each assembly and the construction method steps are described in detail. The technical effects that repeated self-lifting construction can be achieved, an avoiding space can be provided for moving of the moving table, supporting system conversion is effectively achieved, the construction efficiency and convenience are improved, and construction of the straining beam and the capping beam in the cylindrical pier is completed are achieved.

The utility model discloses an anti-scouring device for a river bridge pier, which relates to the technical field of bridge engineering and comprises a bottom support hoop, a first arc-shaped protective cover, a first mounting plate and a second arc-shaped protective cover, and one end of the top of the bottom support hoop is fixedly connected with the first arc-shaped protective cover. First mounting plates are fixedly connected to the two ends of the top and the two ends of the bottom of the first arc-shaped protection cover correspondingly, a second arc-shaped protection cover is slidably connected to the other end of the top of the bottom supporting hoop, and second mounting plates are fixedly connected to the two ends of the top and the two ends of the bottom of the second arc-shaped protection cover correspondingly. According to the bottom supporting hoop, the first arc-shaped protection cover, the first mounting plate and the second arc-shaped protection cover, the bridge pier is protected on the basis of buffering water flow, and therefore the problem that an existing river channel bridge pier anti-scouring device cannot buffer the water flow, and the anti-scouring effect is poor is solved.

The invention discloses an epoxy resin tack coat oil material suitable for a steel bridge deck, which constructs a multi-scale toughening composite system through the synergistic effect of an epoxy-terminated polyurethane elastomer toughening agent (molecular-scale chemical grafting) and a nano-scale elastomer filler (nano dispersion toughening), and solves the problem of rigidity-flexibility imbalance of the traditional epoxy tack coat oil. The material has the advantages of fast curing (surface drying at 25 DEG C is less than or equal to 4 hours), high toughness (the elongation at break is greater than or equal to 250%) and excellent weather resistance (the performance retention rate is greater than or equal to 85% after ultraviolet aging for 500 hours), and is suitable for interlayer interface bonding of steel bridge deck pit slot and crack repair. According to the preparation method, uniform dispersion and interface chemical bonding of the nanofiller are achieved through a segmented stirring process, the comprehensive performance of the material is remarkably improved, and the important engineering application value is achieved.

The invention relates to a stroke-sectioned adjustable variable-damping inflatable hydraulic multi-damping device, and belongs to the technical field of vibration control. Comprising a roll shaft support assembly, a working cylinder assembly, a spring damping assembly and a piston mechanism assembly. The working cylinder assembly is mainly composed of a connecting pull ring, a main liquid storage cylinder, a limiting device, tightness adjusting threads, a piston rod connecting position, an auxiliary liquid storage cylinder and an air storage cylinder. The spring damping assembly is mainly composed of an adjusting spinning roller, a damping spring, a spinning roller damping gasket and a spring damping gasket. The piston mechanism assembly is composed of a piston rod and driving pistons on the two sides. The roller shaft support assembly is composed of a roller shaft fixing support and a pin. Through mechanism linkage of the liquid storage cylinder and the air storage cylinder, the inflatable hydraulic damping device is formed, and the purposes of damping changing and vibration reduction are achieved. The shock resistance and the transmission efficiency of a vibration reduction system can be improved, the energy consumption effect, the structural rigidity and the stability are enhanced, and the advantages of being simple in structure, convenient to implement and the like are achieved.

The application belongs to the technical field of bridge construction, and provides a cable tower automatic deviation rectification method in a bridge construction process. In the bridge construction process, the deformation of the cable tower is detected in real time, and the extension and contraction states of the buckling cables on both sides of the cable tower are adjusted in real time according to the deformation, so that the deformation value of the cable tower is always within a preset deformation range, the perpendicularity of the cable tower and the force balance on both sides of the cable tower in the bridge construction process are ensured, and the problem of construction risk caused by the deviation of the cable tower is solved. Meanwhile, in the process of adjusting the extension and contraction of the buckling cables on both sides of the cable tower, the force conditions of all the buckling cables are detected and controlled in real time, so that the forces of all the buckling cables are within the corresponding preset force range, the problem of large deviation between the actual force and the design force of the buckling cables is avoided, and the problem of premature failure of the buckling cables in the later bridge use process is solved. The whole adjustment process is integrated into the bridge construction process, the construction period is reduced, and the construction progress is ensured.

The invention provides a temporary supporting structure for mounting a girder of a small side box combined hybrid girder cable-stayed bridge and a using method, and belongs to the technical field of bridge construction. Comprising a lower bearing plate, upper bearing plates are arranged on the left side and the right side of the upper portion of the lower bearing plate, tightening hanging rods are arranged on the left side and the right side of the lower end of each upper bearing plate, a sliding seat is arranged at the upper end of each upper bearing plate, a jacking module is arranged in each sliding seat, a connecting plate is arranged above each jacking module, and a longitudinal supporting module is arranged at the lower end of each connecting plate. By means of the transverse hydraulic self-locking rod, when a beam body generates transverse displacement when encountering wind loads, partial displacement can be automatically released, and automatic resetting can be achieved after the displacement acting force value is reduced, and by means of the front-back double-section type contraction transverse support formed by the butt joint rod and the conical rod and in cooperation with the transverse buffering spring, the transverse buffering effect can be achieved. Vibration energy generated in the working process of construction machinery can be absorbed, the influence of construction vibration on the temporary supporting structure is reduced, and the safety of the temporary supporting structure is improved.

The invention relates to the technical field of bridge crack detection, and discloses an automatic bridge crack detection device. The surrounding equipment can surround a bridge pier and climb the bridge pier, the detection equipment is arranged on the surrounding equipment, can move around the bridge pier and can synchronously climb along with the surrounding equipment, and the surrounding equipment is composed of a winding mechanism and climbing mechanisms arranged at the two ends of the winding mechanism; the winding mechanism comprises an outer cylinder and a winding wheel rotationally arranged in the outer cylinder, and two steel wire ropes with the two ends extending out of the outer cylinder and capable of being in butt joint are fixedly connected to the winding wheel. The crack detection device composed of the encircling equipment and the detection equipment is arranged, the encircling equipment and the detection equipment encircle the bridge pier through the steel wire rope, the device can adapt to bridge piers with different diameters, meanwhile, the device is easy to store, the whole structure is compact and easy to carry, and the detection equipment can also move around the bridge pier with the steel wire rope as the rail diameter. Therefore, comprehensive dead-corner-free detection is realized.

The invention relates to the technical field of steel-concrete composite beams, and discloses a steel-concrete composite beam bridge deck reinforcing device which comprises a sealing plate, a first hydraulic cylinder, a first supporting plate, a first polished shaft, a second supporting plate, a first support, a first rotating arm and a second hydraulic cylinder. In the using process, when one side of the top face of the web beam is subjected to overload pressure, the second supporting plate on the same side can be pressed downwards, then the first supporting plate on the same side is made to move downwards, and therefore the moving ends of the first hydraulic cylinders on the same side are made to return. And at the moment, hydraulic oil in the rodless cavities of the first hydraulic cylinders on the same side can enter the rodless cavities of the second hydraulic cylinders on the same side, and then the moving ends of the second hydraulic cylinders on the same side stretch out. And then, under the support of the first support on the same side, the first rotating arms on the same side can deflect towards the direction of the web beam. Due to the fact that hydraulic pressure is adopted as a power source, enough supporting force can be provided for the bottom face and the two side faces of the web beam, and then the anti-overturning performance is improved.

The invention discloses a super-large side span main cable erecting method, which belongs to the technical field of bridge construction, and comprises the following steps: arranging a temporary cable saddle support pad on a support tower, and arranging a temporary cable saddle body, a jacking bracket and a retainer; the main cable structure is pulled and limited to the temporary cable saddle and the retainer; the temporary cable saddle body is closed and locked to clamp the main cable structure, and cable tightening operation is conducted on the main cable structure; the connection between the temporary cable saddle body and the temporary cable saddle supporting cushion is removed, the midspan steel beam is hoisted to tighten and lift the main cable structure, meanwhile, the jacking bracket is operated to jack the main cable structure, the temporary cable saddle body is separated from the temporary cable saddle supporting cushion, and the lower half part of the temporary cable saddle body is removed; the closed locking state of the temporary cable saddle body is relieved, and the upper half portion of the temporary cable saddle body and the temporary cable saddle supporting cushion are removed; a permanent cable saddle lower half saddle body is arranged at the top of the supporting tower; and the main cable structure descends into the lower half saddle body of the permanent cable saddle and is limited, and the upper half saddle body of the permanent cable saddle is buckled to the lower half saddle body of the permanent cable saddle and is fixed.

The invention relates to the technical field of bridge pavement, in particular to a concrete bridge anti-crack bridge deck pavement structure and a pavement method. A high-elasticity modified asphalt mastic macadam concrete upper surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a fiber high-strength dense water asphalt concrete lower surface layer, a fiber non-wheel-sticking emulsified asphalt bonding layer, a high-toughness asphalt sand stress absorbing layer, a fiber waterborne epoxy anti-cracking waterproof bonding layer and a C50 fiber concrete anti-freezing and anti-cracking layer are sequentially arranged from top to bottom. The durability of the bridge deck pavement structure is improved, and the problem that the service life of the bridge deck pavement structure is short is solved.

The invention discloses a precast beam lifting-transporting-erecting intelligent navigation system which comprises a beam lifting operation intelligent navigation unit, a beam transporting operation intelligent navigation unit, a bridging operation intelligent navigation unit and an intelligent control navigation unit. The intelligent control navigation unit obtains field equipment monitoring videos corresponding to the beam lifting operation intelligent navigation unit, the beam transporting operation intelligent navigation unit and the bridging operation intelligent navigation unit respectively and assists in navigation construction. And the intelligent control navigation unit also obtains respective working state data of the three operation intelligent navigation units, performs corresponding processing on the monitoring video data and the working state data, assists accurate intelligent navigation construction, and performs graded alarm when a set threshold value is not met. According to the invention, the equipment state and the operation environment can be monitored in real time, and the lifting, transporting and erecting operation of the precast beam can be accurately guided and intelligently controlled according to the preset navigation path and the operation process, so that the operation efficiency is improved, and the safety risk is reduced.

The utility model relates to the technical field of bridge inhaul cables, in particular to a stress adjusting bridge inhaul cable structure which comprises an upper bearing beam, a lower bearing beam and an adjusting assembly, the upper bearing beam is located below the lower bearing beam, a round hole is formed in the surface of the upper bearing beam, and the inner wall, located in the round hole, of the upper bearing beam is fixedly connected with an upper hanging head. A mounting hole is formed in the surface of the lower bearing beam, a lower hanging head is fixedly connected to the position, located on the inner wall of the mounting hole, of the lower bearing beam, the adjusting assembly is arranged on the lower surface of the upper bearing beam and comprises a guide column, and the guide column is fixedly connected to the upper surface of the lower bearing beam. According to the utility model, the adjusting assembly is arranged, so that the stress of the inhaul cable can be adjusted in real time in different load states in the operation process of the bridge, the stress of the inhaul cable is ensured to be uniform and within a safe stress range, premature fatigue damage of the inhaul cable caused by local stress concentration is avoided, the service life of the inhaul cable is prolonged, and the safety of the bridge structure is further ensured.

The invention discloses a magnetic adsorption robot and a child-mother robot for bridge detection, and belongs to the technical field of bridge detection, the magnetic adsorption robot comprises two vehicle bodies arranged front and back in the advancing direction of the magnetic adsorption robot, and a connecting joint with a self-adaptive angle is connected between the two vehicle bodies; mounting parts are arranged at the bottoms of the vehicle bodies, wheel carriers are hinged to the two sides of each mounting part through hinges, and each wheel carrier is provided with a magnetic adsorption wheel; a detection device, a control device and a battery module are arranged on the vehicle body, the control device is used for controlling the magnetic adsorption robot to move on the bridge, the detection device is used for detecting the bridge, and the battery module is used for providing power support. By arranging the connecting joints and the hinges, the magnetic adsorption wheels can be tightly attached to the adsorption face all the time, the adsorption capacity and the obstacle crossing capacity are improved, and the reliable inspection capacity is achieved; and meanwhile, the two magnetic adsorption robots with different sizes are arranged to form the child-mother robot, so that the safety and the cruising ability are further enhanced.

The invention belongs to the technical field of bridge construction, and particularly relates to a single-end movable tensioning self-resetting winding cable damper which comprises a first fixing end, a second fixing end, a third fixing end and a fourth fixing end. The fixed end II is fixed with the top of the pier; one end of the tying part is fixedly connected with the first fixing end, the other end of the tying part is connected with the second fixing end through an elastic limiting assembly, and the elastic limiting assembly is matched with the second fixing end in an elastic limiting mode. During use, under the action of normal temperature load and vehicle load, slippage between the bridge and the pier can meet the small deformation requirement of normal use; under a small earthquake, relative displacement energy consumption between the movable pier and the beam can be utilized, and the earthquake response of the structure is reduced; under the action of a large earthquake, the first fixed end pulls the elastic limiting assembly to move through the pulling and connecting part, friction energy dissipation is conducted through the pulling and connecting part and the winding shaft, when displacement exceeds the elastic range, the elastic limiting assembly and the first fixed end are in limiting fit, and the relative displacement between the movable pier and the beam is prevented from being too large.

The utility model belongs to a bridge support, and particularly relates to a damping-controllable rigidity-variable shock insulation support. Comprising an upper seat plate, a spherical crown plate, a middle seat plate and a lower seat plate, the upper seat plate and the middle seat plate are positioned and connected through a shear plate and a shear bolt; the limiting mechanism is composed of a limiting check block and a limiting groove, the electromagnetic damping mechanism is composed of a magnet, a high-strength spring and a sheath coil, and the control device is composed of a ground motion sensor, a central processing module and a power supply module. The problems that in the prior art, the overall dimension of a support is too large, and the horizontal rigidity cannot be adjusted and changed once the horizontal rigidity is determined are solved, and the support has the advantages that the overall dimension of the support is small, the horizontal rigidity and damping are adjustable, and cooperative stress under the earthquake working condition of all piers is achieved.

The invention provides a large-span corrugated steel web composite beam and a construction method thereof. The composite beam adopts section prefabrication and field assembly, and a composite abutted seam system is creatively adopted between beam sections. Butt welding is adopted for corrugated steel webs between beam sections, glue seams are adopted for concrete, and shear key teeth are matched, so that the self-alignment performance and the interface shear bearing capacity of a matching surface are improved; wave-shaped abutted seam notches are formed in the upper portions of the concrete top plate and the concrete bottom plate, concrete above abutted seams is a continuous pouring body, the waterproof performance is durable and reliable, and the long-term safety and the service life of the structure are effectively guaranteed under the condition that a waterproof leveling layer is not arranged. And in addition, the concrete in the notches is pre-pressed through the tensioning external prestressing procedure after the beam bodies are closed, the concrete at the abutted seams is further compacted, and super-strong durability is provided. A concrete waterproof layer does not need to be independently arranged on the main beam structure, the second-phase dead load borne by the main beam is effectively reduced while the work amount is reduced, and economic benefits are remarkable.

The invention belongs to the technical field of low-frequency vibration control, and provides a low-frequency tuned mass damping device for reversely stretching a compression spring in order to solve the problem that a traditional tuned mass damper is limited in use of a vertical space due to too large net deformation of the spring under the low-frequency condition. According to the device, large compression deformation and reverse tensile deformation of the spring are fully realized in a limited vertical space in a manner of performing super-compression-reverse tensile treatment on the compression spring, relatively low rigidity required by a vibration system is achieved, low-frequency tuning can be realized in the limited vertical space of a bridge girder, and the rigidity of the vibration system is improved. The frequency application range of the tuned mass device is greatly expanded; and meanwhile, the problems that the stability problem is caused when a traditional compression spring mass body is arranged on the spring and the damping is too high and unstable due to the fact that a guide component is added are solved. The device is simple in structure, low in damping, low in space requirement and good in stability, and can be applied to vertical, lateral and torsional multi-type low-frequency vibration control of various engineering structures.