2860 results about "Pre stress" patented technology

The invention discloses a deep learning-based staged tension prestress long-term loss prediction method, which belongs to the field of deep learning, solves the problem of poor prediction result robustness of a traditional prestress measurement method, and comprises the following steps: obtaining bridge original data based on a standard drawing set and a bridge design specification; based on the construction environment conditions and the concrete age, concrete material attributes are calculated; based on bridge original data and concrete material attributes, finite element software is used for simulating prestressed reinforcement staged tensioning processes under different working conditions, and a bridge prestressed reinforcement staged tensioning loss data set is generated; and constructing a prestress loss prediction model based on the multi-layer perceptron neural network, processing the staged tensioning loss data set of the bridge prestressed reinforcement based on the prestress loss prediction model, and outputting a prediction result of long-term loss caused by shrinkage and creep of the prestressed reinforcement. According to the method, the stress loss of the prestressed reinforcement can be effectively predicted, and the prediction robustness and accuracy are improved.

The invention discloses a method for predicting the damage of a prestressed concrete cylinder pipe in a complex environment, and relates to the technical field of pipeline structure health monitoring, and the method comprises the steps: collecting multi-physical field data through deploying multiple types of sensors, transmitting the data to a central monitoring system in a wireless manner, carrying out the standardized preprocessing, and obtaining a multi-source fusion data set; a salt migration driving index dsa, a stress disturbance induction index yry and an electrochemical activity potential index che are constructed, a comprehensive corrosion risk index SCR is obtained, and corrosion behavior evaluation is carried out. And when the corrosion behavior is evaluated as a disturbance sign, a corrosion change prediction index CAR is further calculated according to time sequence evolution forming a corrosion risk index SCR, grading evaluation and transition identification of the corrosion state are realized, an evaluation result is stored in a database, and a corrosion risk evolution trend is presented through a visual chart. The method supports early warning and emergency response decision making, and has high adaptability and engineering practicability without adding hardware.

The application relates to the field of building technology, in particular to a post-tensioned prestressed seamless concrete floor construction method. In the construction preparation step, a strain sensing sensor is arranged, and a steel strand with a protective sleeve is arranged; in the concrete pouring step, concrete with good early strength is adopted; in the prestressed tensioning step, the stress and tension are monitored through a preset sensor, the strain value when the floor first cracks is determined, the initial value for starting the tensioning device is determined, and the tensioning device is controlled to start tensioning operation. Subsequent control is realized through a control system according to the information monitored by the sensor and the instruction control, and the preset threshold value is preferably less than the initial value for starting the tensioning device, so that the tensioning is started before the internal stress of the concrete is insufficient to cause cracks, and the tensioning process is effectively controlled before the cracks are generated, so that the floor is ensured not to generate cracks.

The invention discloses a cast-in-place concrete beam construction method based on deformation control, and relates to the field of cast-in-place beam construction. S2, foundation treatment; s3, a support is erected and pre-pressed; s4, a formwork is installed; s5, steel bars and prestressed pipelines are installed; s6, concrete construction; and S7, removing the bracket. BIM modeling and an intelligent monitoring system are combined, the foundation treatment range is expanded, an automatic drainage system is arranged, edge settlement and rainwater soaking are effectively avoided, a support system is selected according to needs, anti-sidesway design is strengthened, stress is accurately simulated through graded automatic loading and pre-pressing, reliable deformation data are ensured through double monitoring, pre-camber calculation is scientific, errors are reduced, and the construction efficiency is improved. Formwork, reinforcing steel bars and prestressed pipelines are installed in a standard mode, the structural quality is guaranteed, concrete construction pays attention to temperature control and maintenance, crack reduction and support dismantling are symmetrically carried out in a grading mode, the springback amount is monitored in real time, and construction safety is guaranteed.

The application discloses a post-tensioned prestressed seamless concrete floor construction method, which comprises the following steps: laying a corrugated pipe; installing a tension end and a fixed end node; inserting a prestressed tendon into the corrugated pipe; installing a strain sensing assembly, wherein the strain sensing assembly comprises stress transmission steel bars and a strain sensing sensor, the stress transmission steel bars comprise coaxially arranged first steel bars and second steel bars, and the two main steel bars are connected through connecting steel bars; an installation gap is left between the end faces of the opposite ends of the first steel bars and the second steel bars, and the strain sensing sensor is installed in the installation gap; pouring concrete, wherein the strain sensing assembly is poured and wrapped in the concrete; and tensioning the prestressed tendon, wherein during the tensioning process of the prestressed tendon, the prestress is controlled, the tensioning elongation value is measured as a check, and the strain value of the concrete is simultaneously referred to. According to the application, the strain condition of the concrete in the prestressed seamless floor construction process can be known by the staff through the strain sensing assembly.

The invention discloses a tunnel construction method for a large deformation section of soft rock, and relates to the technical field of tunnel construction for the large deformation section of the soft rock, and the tunnel construction method for the large deformation section of the soft rock comprises the following steps: drilling shallow large-aperture stress release holes and deep small-aperture stress release holes to form a layered release system; differential pressure grouting is conducted around the stress release holes, and a deep reinforcing ring and a shallow coupling ring are formed; a steel frame is erected, and a three-stage stretching locking bottom supporting assembly is installed to form a closed supporting ring; the bottoms of the adjacent steel frames are crossly connected through prestressed pull rods to form an integral rigid grid; a secondary lining is constructed after the longitudinal attenuation conduction period is judged according to the surrounding rock deformation spatial-temporal characteristics; inverted arch first and then arch wall segmented pouring is adopted, and a delayed expanding agent is doped into arch wall concrete. The method can effectively control surrounding rock deformation in the tunnel construction process of the large deformation section of the soft rock, improves the overall rigidity and stability of a supporting system, ensures that the lining is tightly attached to the surrounding rock, and reduces the construction risk.

The invention discloses a bridge prestressed reinforcement post-tensioning method tensioning sequence prediction method based on machine learning, and belongs to the field of machine learning, and the method comprises the steps: collecting basic information of a bridge structure, and generating effective prestress data under different tensioning sequences through finite element simulation based on the basic information; determining an optimal tensioning sequence according to the effective prestress data and constructing an original data set; the original data set is preprocessed and then input into a machine learning model for training, and a prediction model used for predicting the optimal tensioning sequence is obtained; and inputting the basic information of the bridge to be predicted into the prediction model, and outputting a corresponding optimal tensioning sequence. According to the method, the optimal tensioning sequence of the prestressed reinforcement can be accurately predicted, so that the prestress loss in the process of tensioning the prestressed reinforcement is reduced, the bearing capacity of a bridge is improved, the working efficiency is improved, and the working cost is reduced.

The invention relates to the technical field of data processing, and discloses a temperature effect modeling method and system for a concrete tower drum. The method comprises the steps of establishing a finite element model considering joint grading thermal resistance and prestress correction material parameters, adaptively adjusting a time step length according to a solar altitude change rate to calculate a radiation load, obtaining a convergence temperature field through bidirectional coupling iteration of a temperature field and a stress field, and extracting characteristic temperature to train a neural network to realize rapid prediction. According to the invention, the precision and efficiency of temperature effect analysis of the fabricated concrete tower drum are improved.

The invention discloses a prefabricated box girder reinforcement cage forming method suitable for factory manufacturing, which is characterized in that a box girder reinforcement cage obtained by assembling an existing closed hoop is improved into a structure of a bottom web double-U mesh and a top plate double-layer mesh according to a'double-U + top plate 'forming and assembling thought; each type of reinforcing mesh can be automatically produced by bending, binding and welding equipment at the same time, the mesh is moved to a reinforcing steel bar framework assembling area through a special lifting appliance to form a box girder reinforcing steel bar framework, and meanwhile prestressed pipeline strand penetrating installation is carried out. The construction quality problems of strand pulling displacement, deformation damage and the like of the prestressed pipeline are solved, the subsequent prestressed tension safety quality is guaranteed, and the service life of the prefabricated PC box girder is prolonged.

The invention relates to the technical field of wind power prestress monitoring, in particular to an intelligent monitoring system, method, equipment and medium for the prestress of a wind power reinforced concrete tower drum, and the system comprises a monitoring module which is used for obtaining multi-source structure state data from a plurality of sensors on the wind power reinforced concrete tower drum; the processing unit is connected with the monitoring module; the processing unit is configured to perform data processing on the multi-source structure state data; based on the processed multi-source structure state data, constructing a prestress state evaluation model used for representing an association relationship between the prestress data and the structure health index data; and according to an output result of the prestress state evaluation model, triggering a multi-stage early warning module, and generating an early warning signal corresponding to the output result. By constructing a multi-sensor fusion monitoring network, correlation analysis of prestress data and structural health indexes is realized, and a comprehensive basis is provided for safety assessment and maintenance of the tower drum structure.

The present invention relates to the technical field of testing equipment, and specifically discloses a prestressed steel strand performance testing device, comprising a machine body and an adjustable test bench mounted on the top of the machine body via an inclination adjustment unit. The top of the adjustable test bench is also provided with a continuous impact unit, a guide unit, and two left-right symmetrical multi-stage clamping units, wherein the multi-stage clamping units include a primary bending clamping assembly, a bending control assembly, and a secondary circumferential clamping assembly. The present invention can perform tensile strength testing and fatigue strength performance testing on the steel strand in a horizontal state, and can also perform tensile strength testing and fatigue strength performance testing on the steel strand in an inclined state; the present invention performs multi-stage clamping and fixing of the steel strand by cooperating with the primary bending clamping assembly and the secondary circumferential clamping assembly, thereby achieving multi-point and multi-directional clamping, ensuring that the steel strand is subjected to uniform clamping force in multiple directions, and preventing the steel strand from sliding during the tensile strength test.

The invention discloses a damping device suitable for a wind power prestressed steel strand, which comprises a bottom plate, a hoop and an elastic lining, and is characterized in that the bottom plate is fixedly connected with the inner wall of a tower drum; the hoop and the elastic lining are both of a split structure, the elastic lining is used for bundling dispersed steel strands, the hoop is used for fixing the elastic lining, the hoop and the bottom plate are connected through a movable limiting assembly, and the movable limiting assembly is used for restraining swinging of the steel strands. The device has the advantages of being compact in structure, convenient to disassemble and assemble, high in reliability and the like, the bundling bottom plate is integrally mounted on the tower barrel wall in the middle of the steel strand, the split hoop and the elastic lining bundling steel strand are utilized, the movable limiting assembly is adopted between the hoop and the bottom plate to limit movement of the steel strand, and the problems that the middle area of an ultrahigh tower prestress system is not restrained, and construction is not limited are solved. The problem of interference friction with the tower drum wall and accessories due to large swing amount is solved, and the problem of failure caused by build-up force damage of the middle steel strand at the bundling fixing position is also solved.

The invention relates to the technical field of steel wire preparation, in particular to a high-strength prestressed steel wire preparation device and a use method thereof.The device comprises a pay-off mechanism, a pretreatment unit, a drawing mechanism, a heat treatment furnace, a cooling device, a stress applying mechanism, an online stress detector and a take-up mechanism; the stress applying mechanism comprises a tension roller set driven by a servo motor, a hydraulic damper and an on-line stress detector, and the on-line stress detector monitors the strain of a steel wire in real time through an optical fiber strain sensor and is linked with the PLC control system; dynamic prestress control and a multi-stage heat treatment process work cooperatively, so that the tensile strength of the steel wire stably reaches 1570 MPa or above, a closed-loop control tension system and an online detection technology are adopted, the prestress applying precision is high, automatic optimization of process parameters is achieved through an intelligent PLC system, the product percent of pass is greatly increased, and the production cost is reduced. And the energy consumption and the rejection rate are greatly reduced.

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 discloses a fabricated steel-UHPC external prestressing combined box girder and a construction method and application thereof, and relates to the technical field of bridge engineering, the fabricated steel-UHPC external prestressing combined box girder comprises a prefabricated steel-UHPC combined top plate, a prefabricated steel-UHPC combined bottom plate, a prefabricated steel-UHPC combined web plate, a steel diaphragm plate and an external prestressing system. The box girders are formed by combining prefabricated slabs, the prefabricated web plates are firmly connected with the prefabricated top plate and the prefabricated bottom plate through welded steel plates and post-poured UHPC, and arrangement and tensioning of external prestress are achieved by arranging steel anchor boxes and steering gears in box chambers. According to the combined box girder, the steel and the UHPC are combined to form a structural form that the steel plate is wrapped by the UHPC, and the advantages of high strength, high durability, high toughness, high compactness, low creep and the like of the UHPC and the advantages of high strength, high elastic modulus and weldability of steel are fully utilized, so that the box girder has the advantages of being excellent in structural stress performance, light in overall weight, good in durability, small in later-stage deformation, low in cost and the like. And the hoisting device is especially suitable for bridges in urban rail transit or urban railways.

The invention discloses a wire rod for 2000MPa-level prestressed steel with the large specification of 15mm and a preparation method of the wire rod, and belongs to the technical field of metal material preparation and metal pressure processing. The invention aims to develop a 15mm large-specification high-performance prestressed steel wire rod with a novel component system and a matched production process thereof, the tensile strength of the wire rod is greater than or equal to 1200MPa, and the percentage reduction of area (after aging) is greater than or equal to 30%; the product can be used as a large-specification high-strength high-speed rail plate prestressed steel wire and a 1960-2000MPa-grade high-performance prestressed steel wire and a steel strand. According to the method, the technological process of molten iron pretreatment, converter smelting, LF refining, RH refining, square billet continuous casting, casting billet slow cooling pit slow cooling, casting billet heating, high-pressure water descaling, controlled rolling and controlled cooling and PF line heat preservation channel slow cooling and a complete and controllable production process system are adopted; and the harsh requirements of large-size high-performance prestressed materials of modern important projects on the performance of the wire rod are met.

The invention discloses a zoning treatment method for preventing oversized-diameter shield tunnel segments from floating, which comprises the following steps: step 1, arranging an expansion film bag on the outer side of an upper segment, and pouring cement-water glass quick-setting slurry into the film bag through a sleeve to enable the cement-water glass quick-setting slurry to expand to form a pressure arch; 2, pre-stressed anchor rods are arranged on the lower segment, and pressure-bearing gaskets are arranged; 3, after construction in the step 1 and the step 2 is completed, grouting is conducted on the middle segment, cement-water glass double-liquid slurry is injected from the middle segment, the slurry diffuses from the middle to the vertical direction in a fan shape, and the space behind the segment wall is fully filled; the grouting body, a film bag pressure arch formed on the upper portion and an anchor rod anti-pulling system arranged on the lower portion jointly form a continuous bearing structure to cooperatively restrain overall floating of the duct piece.

The invention relates to the technical field of engineering performance intelligent detection, in particular to a concrete main tower circumferential prestressed reinforcement anti-cracking prediction method based on machine learning, which is characterized in that fiber grating strain sensors are arranged on the sections of main tower circumferential prestressed reinforcements, and strain data and environmental parameters in tensioning and operation stages are acquired; marking a cracking state to construct a sample data set; carrying out adaptive segmentation and abnormal value elimination operation on the strain sequence to realize data cleaning; constructing a cracking probability prediction model to process the cleaned data to obtain a cracking prediction probability; and calculating the total loss of the model, training the model, inputting newly collected data into the trained model, outputting a cracking prediction probability, and judging whether to carry out early warning or not. According to the method, online, real-time, intelligent and accurate prediction of the cracking risk of the circumferential prestressed steel bars of the concrete main tower can be realized, the monitoring false alarm rate is effectively reduced, and reliable technical support is provided for bridge operation maintenance and safety management and control.

The invention relates to the technical field of bridge construction engineering, and discloses a prefabricated bridge plate integral tensioning structure which comprises a bridge plate structure and a hydraulic driving device, the bridge plate structure comprises a bridge plate body, a plurality of through holes are formed in the bridge plate body, and the bridge plate body is provided with a plurality of corrugated pipes through the through holes; according to the bridge plate, through the arrangement of a double-liquid space control and limiting baffle structure of the hydraulic driving device, in the springback process after tensioning is completed, the displacement sensor monitors displacement of the steel strands in real time, and when it is detected that the springback distance is abnormal, the steel strands are driven by the hydraulic driving device to move back and forth. The position of the first anchor clamping piece is cooperatively adjusted through the third push rod and the second push rod, it is ensured that the first anchor clamping piece is tightly attached to an anchorage device hole, damage to the interior of a bridge plate due to too high prestress is avoided, potential safety hazards in subsequent use are reduced, and the structural stability is improved.

The invention discloses a chlorine salt corrosion resistant prestressed concrete solid square pile and a construction method thereof, a cementing material of a pile body concrete body of the square pile comprises a mineral admixture accounting for 50%-70% of the total mass of the cementing material, and the cementing material adopts Portland cement; sacrificial anode blocks electrically connected with the main reinforcements are embedded in the pile body concrete body. The pile body concrete body is doped with a composite corrosion-resistant and rust-resistant agent; the outer surface of the pile body concrete body is coated with polyurea waterproof paint or epoxy seal primer. An electromigration type corrosion inhibitor and a microcapsule containing bacillus are doped into the pile body concrete body; the prestressed main reinforcements are steel reinforcements with anti-corrosion coatings; and fiber bragg grating sensors are pre-embedded around the prestressed main reinforcements. The mixing proportion of the concrete body of the pile body is specially designed for fixing and blocking chloride ions, an inapplicable sulfate-resistant cement scheme is abandoned, and the chlorine salt resistance is improved from the source of materials.

The invention relates to the field of steel member engineering, in particular to a high-strength steel combined multi-chamber box-section bent steel member and a manufacturing method thereof, and the manufacturing method comprises the following specific steps: S1, obtaining the design form of the steel member; s2, preparing an outer side chamber of the steel member; s3, prestress is applied to the outer side chamber in the axial direction of the outer side chamber so that the outer side chamber can be bent to a first form, a first eccentric value of the first form is obtained, and the first eccentric value is larger than the designed eccentric value; s4, top pressure towards the inner side of the bend is applied to the first form to a second form, the second form is in a pre-tightening state, a second eccentric value of the second form is obtained, and the second eccentric value is smaller than the designed eccentric value; s5, the outer side chamber is kept in the second form, and the matched inner side chamber is welded to obtain the steel member; and S6, after the force is unloaded, the inner side chamber is subjected to pre-tensile stress, the outer side chamber is subjected to pre-compressive stress, and the steel member is obtained. Pre-tensile stress is applied to the inner side of the steel member, pre-compressive stress is applied to the outer side of the steel member, and therefore the axial compression buckling ultimate load of the bent steel member is increased.

The invention discloses a construction method of a fan blade dynamic load experiment table, which comprises the following steps of: pre-burying a fixing piece in a bottom plate foundation, and arranging a prestressed tendon corrugated pipe; concrete is poured into the bottom plate foundation, curing is completed, and the bottom plate is formed; a truss required by the anchor bolt cage is arranged on the bottom plate; installing and fixing a prestressed steel strand and a prestressed tendon corrugated pipe of the dynamic load test bed; base steel bars are bound and fixed in a layered mode, and a construction hole channel steel formwork is installed and fixed; pouring construction is conducted from the bottom face of the bottom plate to the truss and the preset height area in sequence, and a base is formed; three groups of prestressed components are respectively arranged in three axial directions of the base and are connected with the three groups of prestressed tendons; and the three sets of prestressed tendons are alternately tensioned according to a preset tensioning sequence, so that the prestress of the three sets of prestressed tendons sequentially reaches 30%, 60% and 100% of the specified tensioning stress. The anti-fatigue performance and the anti-cracking performance of the base are improved in three directions, and the overall mechanical property of the base is good.

The invention relates to an active unloading sheet pile revetment reinforcement design method and structure, and belongs to the technical field of revetment reinforcement. Channel parameters and soil mechanical characteristics are measured, design reinforcement piles with the same height as original pile foundations are arranged on the back edge of a revetment, and a pile spacing calculation formula is established based on the soil arching effect; the load sharing ratio of the reinforcing pile is controlled and designed by adjusting the pile diameter; the reinforcing structure designed through the method comprises prestressed sheet piles, a bearing platform, designed reinforcing piles, a gravity type retaining wall, a slope protection surface layer, a concrete coping, an original mud surface line and a designed mud surface line, the pile diameter and the pile distance of the designed reinforcing piles are dynamically adjusted according to the dredging depth, and the thicker a dredging soil layer is, the larger the soil pressure is, the larger the pile diameter is, and the denser the distance is. An original revetment upper structure does not need to be dismantled, the construction period is greatly shortened, and resource waste is reduced; the front line of the revetment does not move forwards, and use of an existing navigable water area is not affected; the construction mode is flexible, land dry land or water construction can be selected according to surrounding conditions, the construction period is short, the speed is high, and the construction cost is low.

The invention discloses a pile head treatment method applied to a static load test, and relates to the technical field of prestressed pipe pile static load tests, and the pile head treatment method comprises the following steps: step 1, pile head treatment: carrying out muck cleaning work on a cut pile head; secondly, a buffer protection structure is poured on the pile head through the multifunctional pile head processing device; the multifunctional pile head processing device comprises a diagonal bracing structure in lap joint with the upper opening edge of an inner cavity of a pile head, a baffle falling on the diagonal bracing structure, an inner formwork surrounding the baffle and an outer formwork surrounding the outer edge of the pile head, and the portion between the inner formwork and the outer formwork and the portion above the baffle are used for pouring to form buffer layers; the multifunctional pile head device further comprises arc-shaped steel pile hoops, the two steel pile hoops are spliced and then arranged on one section of the pile head pouring buffer layer of the pipe pile in a sleeving mode, and the steel pile hoops are matched with the buffer layer to form a buffer protection structure. The method has the effect of reducing the probability that the static load test is influenced by the damage of the pile head of the prestressed pipe pile.

The invention provides an umbrella-like floating platform and a tensioning method thereof. The umbrella-like floating platform and the tensioning method are used for solving the problem that an existing floating platform is large in weight and high in manufacturing cost. Comprising a platform ring and a pressed ring which are arranged in parallel, and a plurality of side stand column buoys are vertically connected between the platform ring and the pressed ring; a central stand column is further arranged at the central axis of the platform ring and the pressed ring, the bottom end of the central stand column extends out of the lower end face of the pressed ring, and a plurality of first inhaul cables and second inhaul cables are arranged between the pressed ring and the top end and the bottom end of the central stand column respectively. The first inhaul cables and the second inhaul cables are arranged in an annular array mode along the central axis of the central stand column. By arranging the inhaul cables, the inhaul cable tension steel structure is pressed, a tension-compression balanced prestressed cable net system is formed, under the condition that the stress performance of the whole structure is kept unchanged, the steel consumption of the platform is remarkably reduced, the purpose of the lightweight structure is achieved, and then the manufacturing cost is reduced.

The self-adaptive staged energy consumption friction-shear yield composite damper comprises a friction energy consumption unit, an inner friction plate, an outer friction plate, at least two shear energy consumption units and an H-shaped steel plate, wherein the inner friction plate and the outer friction plate are located on the friction energy consumption unit, and the H-shaped steel plate is located at the tail end of the friction energy consumption unit and used for fixing the friction energy consumption unit. The prestressed bolt sequentially penetrates through the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit and is connected with the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit through at least one pair of linkage rods, and the two ends of the friction energy dissipation unit are connected to beam-column joints respectively. The linkage rod does not make contact with a linkage rod penetrating hole of the shearing energy dissipation unit during displacement, and only the friction energy dissipation unit works; and the linkage rods make contact with the linkage rod penetrating holes in a displacement mode, the shear energy dissipation devices are fixed, the shear plates are subjected to shear deformation, and the earthquake displacement response of the structure is effectively reduced through staged energy dissipation and the displacement amplification effect.

The present application relates to the technical fields of prestressed positioning mesh welding, and especially relates to a multi-stage adjusting mechanism for prestressed positioning mesh, which is provided with a welding control module, an information capturing module, a displacement analysis module and a welding correction module. The transverse steel bars are laid on the longitudinal steel bars through the laying unit, the intersection positions of the longitudinal steel bars and the transverse steel bars are welded through the welding unit, the vibration intensity change curve is drawn through the information capturing module, it is determined whether there is vibration allowance abnormal phenomenon at the intersection positions and the vibration allowance abnormal category of the intersection positions is determined through the abnormal analysis unit, the welding correction mode is selected through the welding correction module, and then, the quick abnormal risk identification according to the actual situation in the steel bar welding and sticking process is realized, the abnormal welding positions are classified and processed, the welding correction mode is adaptively adjusted, and the production efficiency and welding reliability of the prestressed positioning mesh are improved.

The invention relates to the technical field of wind power towers, and discloses a concrete-filled steel tube truss type hybrid wind power tower which comprises a tower drum, a plurality of steel tube beams and a plurality of steel tube beams. The truss unit is suitable for supporting the tower drum; the transition unit is arranged between the tower drum and the truss unit so as to connect the tower drum with the truss unit; the bearing platform unit is arranged at the end, away from the tower drum, of the truss unit and suitable for bearing the truss unit; the truss unit comprises at least one pipe body, and concrete is poured in the pipe body. And the constraint stranded wires are tensioned in the axial direction of the pipe body and anchored to the transition unit and the bearing platform unit correspondingly, and the constraint stranded wires are at least arranged outside the pipe body. According to the concrete-filled steel tube truss type hybrid wind power tower, the constraint stranded wires are arranged outside the tube body, the situation that the cable penetrating process is complex and cannot be observed is avoided, the situation that the constraint stranded wires are mutually wound in the cable penetrating process is avoided, constructors can conveniently and directly observe the tensioning state outside, and it is ensured that prestress is accurately applied.

The invention discloses a self-resetting multi-section prefabricated assembled pier and a construction method, the self-resetting multi-section prefabricated assembled pier comprises a prefabricated cover beam, a pier column and a pier bearing platform, the pier column is formed by splicing a plurality of prefabricated sections, and is connected with the prefabricated cover beam through the prefabricated section located at the top; the prefabricated bent cap is connected with the pier bearing platform through a prefabricated section located at the bottom in a bell and spigot joint mode, and the non-adhesive prestressed tendons are connected with the prefabricated bent cap and the pier bearing platform and provide self-resetting capacity for the pier. According to the multi-section prefabricated assembled pier with the self-resetting capacity and the construction method, the formworks are prefabricated in a unified mode in a factory, the efficiency is improved while the prefabrication and construction cost is reduced, the mode of prefabricated section splicing and shallow socket connection is adopted, construction in narrow and complex terrains is facilitated, prestressed tendons used for self-resetting are arranged, and the construction efficiency is improved. The overall anti-seismic performance is improved, the integrity, rigidity and bearing capacity of the assembled pier are improved, the service life is prolonged, and meanwhile the maintenance cost is reduced.

The invention relates to an outer cylinder prestress reinforced composite material pipe and a design method thereof, and belongs to the technical field of fluid conveying pressure pipelines. The pipeline comprises an outer cylinder, a middle steel cylinder and a concrete inner cylinder, the pipe diameter is 1600-5000 mm, the outer cylinder is composed of a composite material formed by mixing multiple layers of annularly-wound glass fibers and epoxy resin and is prestressed, the glass fibers account for 50%-70% of the volume of the outer cylinder, the equivalent elastic modulus, the Poisson's ratio and the tensile strength are calculated, mechanical analysis of the composite material is simplified, and the tensile strength of the composite material is improved. The middle steel cylinder is configured as a supporting layer, and the concrete inner cylinder is configured as a pressure-resistant and fluid channel. Based on the thick-wall cylinder theory, the prestress of the outer cylinder enables the concrete inner cylinder to be pressed in advance, the internal pressure tensile stress is counteracted, and the cracking risk is reduced. Under regulation and control of prestress, the outer cylinder bears main circumferential tension, tension of the middle steel cylinder is reduced, and cooperative bearing is achieved. The composite pipe has high strength, light weight and corrosion resistance, the problems that a traditional pipe is prone to cracking, high in steel consumption and short in service life are solved, and safety, durability and economical efficiency are remarkably improved.