651 results about "Prestressed concrete" patented technology

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 invention discloses a large transport vehicle bridge safety assessment method based on fuzzy comprehensive evaluation, which comprises the following steps: constructing a bridge bearing capacity reduction coefficient model, integrating four factors of material performance degradation, structural damage, environmental corrosion and load combination, and determining index weights by adopting an analytic hierarchy process; and a multi-stage evaluation system is established in combination with a fuzzy mathematics theory. A prestressed concrete continuous beam bridge in Jiangsu section of Jinghai highway is taken as an object, finite element simulation is used for analyzing the load effect of large vehicles under independent and mixed passing conditions, and verification shows that when the large vehicles pass at the mixing rate of 20%, the most unfavorable section safety coefficient of the bridge reaches 1.35, and the standard requirements are met. According to the method, fuzzy mathematics and structural mechanics analysis are creatively fused, a standardized process of parameter collection, model calculation and safety judgment is established, the efficiency is improved by 40% or above compared with a traditional static load test, the method is applied to transportation examination and approval of five bridges in Jiangsu province, a scientific basis is provided for selection of large transportation channels, and the risk of bridge damage is effectively prevented.

The invention discloses an ultrahigh-strength prestressed concrete pipe pile and a preparation method, and relates to the technical field of building materials. The ultrahigh-strength prestressed concrete pipe pile comprises a core layer which is composed of 1.0%-2.0% by volume of chopped basalt fiber reinforced concrete, the fiber length is 8-12 mm, the diameter is 15-20 microns, and the compressive strength is larger than or equal to 130 MPa; the transition layer is composed of hybrid fiber reinforced concrete with the volume fraction of 3.0%-4.0%, steel fibers account for 60%-75%, polyethylene fibers account for 25%-40%, the length-diameter ratio of the steel fibers is 50-80, and the tensile strength is larger than or equal to 1200 MPa. Through gradient fiber reinforced structure design and preparation process innovation, the mechanical property, the production efficiency and the environmental friendliness of the prestressed concrete pipe pile are synergistically improved. Firstly, in the aspect of mechanical properties, the compressive strength is made to break through 130 MPa through the synergistic effect of the core layer basalt fiber and the high-activity superfine slag powder and is improved by 30% or above compared with a traditional C100 pipe pile, and meanwhile the shear strength is improved to 18 MPa or above through a transition layer steel-polyethylene hybrid fiber system.

The utility model discloses a steel pipe truss assembly type prestressed concrete laminated slab, and particularly relates to the technical field of building components, the steel pipe truss assembly type prestressed concrete laminated slab comprises a prefabricated slab, a truss is installed at the top end of the prefabricated slab, the truss comprises a steel pipe, adjusting assemblies are arranged on the steel pipe at intervals, and each adjusting assembly comprises a clamping groove, a lifting groove, a lifting piece and a limiting piece. The clamping grooves are formed in the side walls of the top end and the bottom end of the steel pipe, the lifting groove is formed in the steel pipe, and the two ends of the lifting groove are communicated with the two sets of clamping grooves in the steel pipe. When the lifting piece descends, the inclined buckle plate gradually inclines and is perpendicular, so that the attaching strength of the inner wall of the buckle groove and the hook end is improved, the hook is not prone to disengaging from the buckle groove in the buckle plate, and the situation that the hook disengages from the truss steel pipe, and consequently operation danger is increased is effectively avoided.

The utility model discloses a water delivery PCCP (prestressed concrete cylinder pipe) fixing device, which belongs to the technical field of PCCP fixing, and comprises an annular steel belt, a locking component, a through hole and a steel wire rope, when the steel wire rope is used for grouting, mortar can be gathered downwards along the steel wire rope by repeatedly pulling the steel wire rope at the two ends of the steel wire rope, and the steel wire rope can be used for fixing the PCCP. Through the arrangement of the through holes, the vibrating effect can be achieved, mortar filling is more uniform, in the repeated drawing process of the steel wire rope, air in the filling gaps can be discharged outwards from the gaps between the through holes and the steel wire rope, mortar filling is more convenient, drawing can be more convenient through the arrangement of the drawing handle, and the practicability is high. And by arranging the sliding wheels, the steel wire rope can be pulled more smoothly when being pulled repeatedly, so that the pulling resistance is reduced, and the operation is more convenient.

The invention discloses a steel pipe truss assembly type prestressed concrete laminated slab, and relates to the field of concrete laminated slabs. Comprising an internal PVC pipeline arranged in a concrete laminated slab, a PVC pipeline and a first internal steel pipe truss which are poured and fixed in the concrete laminated slab, and an external steel pipe truss which is connected to a second internal steel pipe truss in a threaded fit manner; when the grouting mechanism is connected to the end of the PVC pipeline, concrete sequentially passes through the PVC pipeline, the internal PVC pipeline, the first internal steel pipe truss, the second internal steel pipe truss, the external steel pipe truss and the grouting hole to be injected into the peripheral connecting position of the concrete laminated slab. The concrete laminated slab is provided with three modules, and the purposes that the connecting strength of the connecting positions of the concrete laminated slab is improved, concrete is convenient to pour and fix, and the position of the concrete laminated slab is convenient to adjust can be achieved.

The invention discloses a non-autoclaved prestressed concrete pipe pile and a preparation method thereof, and relates to the field of fish culture. According to the autoclave-free prestressed concrete pipe pile and the pipe pile preparation method, through collaborative innovation of a material system and process design, comprehensive breakthrough is achieved in the aspects of mechanical properties, environmental protection benefits and environmental adaptability; in the aspect of technical performance, the hydration activity in a low-temperature environment is remarkably improved due to introduction of the phosphorus slag and the composite exciting agent in the cementing material, so that the compressive strength of the pipe pile in 28 days in the environment of-20 DEG C reaches 95% or above of a standard value (embodiment 3: 98.0 MPa), and meanwhile, the compactness of concrete is improved by 20% or above due to optimal grading of the nickel ore slag sand and the two-graded broken stone; after 300 times of freezing and thawing cycles, the mass loss is only 2.8% (embodiment 1), the chloride ion permeability coefficient is as low as 1.4 * 10 <-12 > m < 2 > / s, and the anti-permeability and durability are obviously superior to those of a traditional autoclaved pipe pile (contrast experiment: freezing and thawing loss rate reaches 46%).

The invention discloses a pre-stressed concrete precast pile with an end plate and additional mechanical connection, which comprises a pre-stressed steel bar, a concrete pile body, the end plate and a mechanical connection assembly mounted on the end plate, and the mechanical connection assembly comprises an insertion rod, a bushing, a plurality of occlusion petals and a compression spring, a blind hole corresponding to the mechanical connecting assembly is formed in the end face of the concrete pile body, an opening of the blind hole communicates with the mounting hole, the lining is in threaded connection with the mounting hole, a plurality of occlusion petals are arranged in an inner space formed by the lining and the blind hole, and compression springs are arranged between the occlusion petals and the end face of an inner cavity of the blind hole. When the adjacent prestressed concrete precast piles with the end plates in additional mechanical connection are connected, the end plates provided with the inserting rods are close to the end plates provided with the bushings, the inserting sections penetrate through the bushings to be inserted into the occlusion petals, and then the end plates are welded. According to the prestressed concrete precast pile with the end plates and the additional mechanical connection, the pile head strength is guaranteed, and meanwhile the corrosion resistance and the connection strength of connection between piles are improved.

The invention relates to the field of steel member engineering, in particular to a prestressed concrete combined double-chamber box-section bent steel member and a manufacturing method thereof, and the manufacturing method comprises the following steps: S1, welding an inner box chamber and forming an assembly hole; s2, first bolts and second bolts are inserted into the assembly holes; s3, first bolts and second bolts are initially screwed to apply inward prestress to the two webs and the two flange plates, and the side wall of the inner box chamber is made to generate inward concave elastic pre-deformation; s4, welding the outer box chamber and the reinforcing plate; s5, an expansion material is injected into a cavity of the inner box chamber; s6, the expansion material expands to enable deformation of a web plate and a flange plate of the inner box chamber to be reset to the design form; and S7, finally screwing the bolt and stabilizing the pressure. The circumferential confining pressure state of the expansion material is achieved through the prestress bolt system, the compressive strength of the expansion material is multiplied, and therefore the axial compression buckling ultimate load, the compressive bearing capacity and the stability of the bending component are greatly improved.

The invention relates to a foundation pit supporting method based on combination of steel sheet piles and tubular piles, which comprises the following steps of: firstly, excavating a foundation trench at the periphery of a foundation pit, vertically driving the steel sheet piles into the foundation trench to form a continuous supporting wall body, and realizing a closed joint through lock catch occlusion; the top of the prestressed concrete pipe pile is lower than the steel sheet pile; welding the pipe piles and the steel sheet piles by adopting H-shaped steel connecting pieces, wherein the welding length is greater than or equal to 1.5 times of the section height of the section steel; cement grout with the volume 1.8-2.2 times that of the pipe pile is injected within 24 hours after the pipe pile is installed; the section width of the locking beams is 1.2-1.5 times that of the flanges of the steel sheet piles, and the steel bars are in lap joint with the reserved steel bars of the steel sheet piles; and finally, a horizontal steel support comprising a pressure sensor and an electric jack is installed, and the axial force is dynamically adjusted through displacement monitoring. According to the method, the rigidity of a supporting system is remarkably improved through cooperative stress of the combined structure, the method is suitable for deep foundation pit engineering in the soft soil area, deformation can be effectively controlled, and automatic monitoring and adjusting are achieved.

The utility model belongs to the technical field of engineering construction, and particularly relates to a pre-tensioning method prestressed concrete plate beam which comprises a concrete plate beam body formed by concrete pouring and a forming base plate. Plate-shaped formworks are symmetrically installed on the top of the forming base plate and located on the two sides of the concrete plate beam body, lead screw sliding blocks are symmetrically and fixedly connected to the positions, close to the two sides, of the bottoms of the formworks, and linear guide rails corresponding to the lead screw sliding blocks are arranged on the peripheries of the lead screw sliding blocks and located at the bottom of the concrete plate beam body. The lead screw sliding blocks are slidably connected with the linear guide rails, auxiliary sliding blocks are correspondingly and fixedly connected to the positions, close to the lead screw sliding blocks, of the bottom of the mold plate, and auxiliary sliding grooves are correspondingly formed in the positions, located on the top of the forming base plate, of the peripheries of the auxiliary sliding blocks. The pre-tensioning pre-stressed concrete plate beam has the advantages that when the pre-tensioning pre-stressed concrete plate beam is prefabricated, mold splitting can be effectively stabilized, and damage to the surface of the pre-tensioning pre-stressed concrete plate beam is avoided.

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 utility model discloses an electromagnetic elastic cable force sensor, and relates to the technical field of monitoring of internal bundle prestress in a prestressed concrete structure. The electromagnetic elastic cable force sensor body is arranged on the preset pipeline in a sleeving manner and is located in the middle of the preset pipeline; each connecting assembly comprises a protective shell, a first connector and a second connector, the first connector and the second connector are fixedly arranged in the protective shell, the first connector is used for being connected with the end of a preset pipeline, and the second connector is used for being connected with the end of a prestressed pipeline in a to-be-tested concrete structure; the first connector and the second connector are in sealed connection with the inner wall of the protective shell. The electromagnetic elastic cable force sensor is convenient to use, does not need to be calibrated repeatedly, reduces the workload, saves the calibration period, and can prevent the detection signal of the electromagnetic elastic cable force sensor body from being influenced because the preset pipeline is made of the non-metal non-magnetic material, thereby improving the detection accuracy.

The invention relates to the technical field of bridge load tests, and provides a bridge load test crack increment change observation method and system, and the method comprises the steps: collecting prestressing tendon circumferential strain distribution data and dual-wavelength strain response data; calculating an interface bonding stiffness change parameter; pre-stress modulation effect compensation and polar coordinate system conversion are carried out on the strain response data and the rigidity change parameters, and micro-crack characteristic signals are obtained; load data and beam group arrangement parameters are collected, and a micro-crack propagation prediction model is established in combination with the interface bonding stiffness change parameters; inputting the micro-crack characteristic signal into a micro-crack propagation prediction model, and outputting a micro-crack development trend prediction result; and adjusting sampling parameters of a dual-wavelength time division multiplexing algorithm and characteristic extraction parameters of prestress modulation effect compensation according to a micro-crack development trend prediction result. According to the invention, the precision of observing the increment change of the micro-crack in the bridge load test is improved, and the automatic monitoring and prediction of the micro-crack of the prestressed concrete bridge are realized.

The invention relates to a space curve prestress composite beam column and a design method thereof. The bottom of the space curve composite beam column is vertically upward, the tail end overhanging part is approximately horizontal, and the middle part is connected with the horizontal prestressed concrete closed beam to form a space structure. The horizontal closed prestressed beam and the space curve composite beam column support each other, the constraint boundary condition of the space curve composite beam column is changed, and the internal force distribution and magnitude of the space curve composite beam column are changed. According to the space curve composite beam column with the horizontal closed prestressed beam, the anti-cracking and anti-bending performance of a component is improved, and the deformation performance of the component is also improved. Therefore, the structure is particularly suitable for large cantilever structures with high deformation and bearing capacity.

The invention discloses a PCCP (prestressed concrete cylinder pipe) broken wire monitoring and pipe explosion early warning method and system, and belongs to the technical field of PCCPs. The PCCP broken wire monitoring and pipe explosion early warning method comprises the following steps that S1, sensors are arranged on the PCCPs; s2, the sensor monitors the PCCP pipe in real time and transmits data to the signal transmission module; s3, the signal transmission module transmits the signal to a signal processing module for data preprocessing; s4, a feature extraction unit extracts frequency domain features and time domain features and extracts the change rate and the strain gradient of the strain; s5, inputting the features into a broken wire recognition model to judge whether a broken wire phenomenon exists or not and determine the number and positions of broken wires; s6, the pipe explosion risk evaluation unit evaluates the pipe explosion risk by using a fuzzy comprehensive evaluation method to obtain a risk level; and S7, when the pipe explosion risk level exceeds a preset threshold value, an early warning unit gives out early warning. According to the PCCP broken wire monitoring and pipe burst early warning method and system, the real-time performance, accuracy and intelligent level of monitoring are improved.

The invention discloses a method for evaluating the time-varying reliability of a prestressed concrete continuous box girder bridge based on actually measured traffic flow, which comprises the following steps of: establishing a finite element model of the prestressed concrete continuous box girder bridge according to a bridge structure design drawing, and calculating and defining the section attribute of each section in the longitudinal bridge direction; determining the most unfavorable section position of the bridge structure; the time-varying bearing capacity of the most unfavorable section is calculated through the constructed degradation model; preprocessing the data acquired by the dynamic weighing system; establishing the preprocessed dynamic weighing data into a numerical model to realize the construction of a traffic flow model; performing bridge dynamic analysis to obtain a load effect; calculating a time-varying reliability index in the service period of the bridge; and comparing the calculated time-varying reliable index with a target reliable index in the specification. According to the method, the time-varying reliability of the in-service prestressed concrete continuous box girder bridge in the service period can be accurately evaluated, and subsequent management and maintenance work is guided.

The utility model relates to the technical field of concrete laminated slabs, and discloses a prestressed concrete laminated slab which comprises a plurality of inner ribs, the inner ribs are arranged in a crossed mode, a bottom plate wraps the outer sides of the inner ribs, a plurality of fixing rib plates are fixed to the upper plate face of the bottom plate at intervals, and clamping pipes are arranged on the two sides of the upper plate face of the bottom plate. The clamping pipes and the fixing rib plates are arranged in parallel, a connecting strip is installed between every two adjacent bottom plates which are connected in parallel with the fixing rib plates, the two sides of the connecting strip are connected with the clamping pipes of the two bottom plates in a clamped mode respectively, and a limiting plate is installed between every two adjacent bottom plates which are connected in the mode of being perpendicular to the fixing rib plates. According to the device, the problems that construction is tedious due to cast-in-place vacancy filling plates, and ribs need to be formed on the laminated plates and are inconvenient to transport are solved, the connecting strips and the limiting plates are used for connecting joints of the two plates, the ribs do not need to be formed, the vacancy filling plates do not need to be poured, and transportation and construction are facilitated.

The invention discloses a system for predicting the bearing capacity of a prestressed concrete pile through a static pressure method. The system comprises a static pressure pile machine construction monitoring module, a digital static sounding module, a data receiving module, an interactive touch screen module, a bearing capacity calculation module and a cloud data center. The invention further discloses an implementation method of the static pressure method prestressed concrete pile bearing capacity prediction system, the feed-forward neural network model is used for correlation analysis of bearing capacity prediction data, input original data can be efficiently analyzed, after each time of model iteration, the updated model is transmitted to the on-site algorithm analysis unit through the 5G module, and the prediction result of the bearing capacity of the static pressure method prestressed concrete pile is obtained. Dynamic updating and optimization of the field model are achieved, the real-time performance and accuracy of prediction of the ultimate bearing capacity of the prestressed concrete piles are effectively improved through the mechanism, the limitation that a traditional acceptance method only depends on static load tests of a few piles is overcome, the bearing capacity of all the piles can be comprehensively evaluated, and potential safety hazards of construction are reduced.

The invention relates to the technical field of assembly type concrete structures, and discloses a ribbed prestressed concrete composite floor slab and a design method thereof.The ribbed prestressed concrete composite floor slab comprises concrete prefabricated bottom plates, bottom plate ribs, prestressed steel bars and non-prestressed steel bars, and the extending ends of the non-prestressed steel bars of the adjacent concrete prefabricated bottom plates are arranged in a staggered mode and obliquely extend into a composite cast-in-place layer to be anchored; groove-shaped additional steel bars are arranged at the joints of the composite floor slabs, the open ends of the groove-shaped additional steel bars are connected with plate top steel bars to form an integral reinforcing structure, and first distribution steel bars are perpendicularly connected to the bottoms of the inner sides of the groove-shaped steel bars to achieve dense splicing of the joints. And the anisotropic rigidity of the laminated slab is corrected through a rigidity adjustment coefficient # imgabs0 #, a deflection differential equation is established to calculate deflection, and reinforcing bars are designed in a graded mode in combination with the construction parameters of the laminated building. The anti-cracking performance and rigidity of the concrete prefabricated bottom plate can be improved, the maximum applicable span of the composite floor slab is enlarged, the flexural capacity reaches or is close to that of an equal-thickness cast-in-place slab, the steel content of the non-flexural steel bars is low, the production cost can be reduced, and meanwhile the quality of components is improved.

The invention relates to the technical field of positioning devices for building construction, and discloses a prestressed concrete pipe pile construction positioning device which comprises a fixing frame, a plurality of soil nails are fixedly connected to the bottom of the fixing frame, a plurality of lifting plates are slidably connected to the top of the fixing frame in a clamped mode, and a plurality of guide plates are arranged at the top of the fixing frame. An adjusting mechanism is arranged on the inner side of the fixing frame, a supporting mechanism used for bearing a welding gun is arranged on the inner side of the fixing frame, and the supporting mechanism comprises a lifting ring. The adjusting mechanism is matched with the guide plate for transmission to drive the guide roller to ascend before pile splicing, so that the guide roller is matched with the first electric push rod for positioning and centering of a pile body of a butt joint pile and moves synchronously with the pile body of the butt joint pile subsequently to be in butt joint with the pile body at the bottom, and therefore the height of the lifting ring is adjusted according to the height of the top face of the pile body at the bottom; the follow-up supporting blocks with the corresponding heights can assist in pile splicing operation, and the overall pile feeding efficiency and the pile pressing quality are improved.

The utility model provides an offshore photovoltaic precast concrete composite pile, which comprises a pile structure, the pile structure comprises a concrete pile foundation and a steel hoop, the concrete pile foundation is triangular on the vertical projection plane of the composite pile, the concrete pile foundation comprises a concrete pile vertically arranged along the composite pile, and the steel hoop is arranged on the concrete pile. The pile structure further comprises a truss structure, and the steel hoop is connected with the end portion of the truss structure to form a triangular edge portion. According to the prefabricated concrete combined pile, the high-strength prestressed concrete piles are adopted, the steel truss structure is used for connecting the prestressed concrete piles together to form a space truss structure, and the space truss structure serves as an integrally stressed pile foundation structure, so that the combined pile is high in horizontal load bearing capacity and bending moment bearing capacity; and therefore, the pile body material and the work amount are saved.

The invention discloses a light-weight corrosion-resistant prestressed concrete cylinder pipe which comprises a steel cylinder, a UHPC pipe core, a BFRP prestressed tendon layer and a mortar protection layer. The two layers of UHPC pipe cores are respectively positioned on the two sides of the steel cylinder; the BFRP prestressed tendon layer is fixed through a split type basalt anchoring device, and the anchoring device comprises an inner layer BFRP-RPM embedded part and an outer layer epoxy resin grouting layer. Variable cross-section thickness distribution is designed in the axial direction of the UHPC pipe core, the end thickness # imgabs0 # of a bell and spigot is 60-80 mm, and the middle thickness # imgabs1 # of the bell and spigot is 40-50 mm; bFRP prestressed tendons are adopted to replace traditional high-strength prestressed steel wires. The BFRP material has excellent corrosion resistance and can keep stable performance in a chloride ion corrosion environment, so that the problem of wire breakage caused by corrosion is avoided, the corrosion resistance of the pipeline is remarkably improved, and the service life of the pipeline is prolonged.

The present invention discloses a device and method for rapid detection of prestress under the whole-hole anchor of a prestressed concrete bridge. The device and method have the advantages that a signal transmitting device is added to the working anchor to send out timing signals when each working clip is separated from the working anchor ring, and strain gauges electrically connected to a computer are pasted on the prestressed tendons one by one, so that the computer can collect the effective prestress values ​​under the anchor of all corresponding prestressed tendons according to the timing signals and the resistance values ​​of the corresponding strain gauges during a reverse tensioning operation of a through-hole jack, thereby greatly improving the detection efficiency and making the reading of the detection values ​​more convenient and intuitive. For example, if a bundle of prestressed tendons fails the detection, it can be targeted and re-tensioned.

The invention discloses a bridge damage assessment method based on acceleration spectrum analysis after an axle impact event. According to the method, based on long-term vibration monitoring data of the bridge and real-time data during axle collision, the maximum impact force borne by the bridge during collision is calculated, the maximum impact force calculated through the two methods is compared, the fitting degree is analyzed, and therefore a bridge damage state evaluation model is constructed, and basic bridge damage evaluation indexes are established; and the damage degree of the impacted bridge can be quickly evaluated in real time. By establishing the bridge damage state evaluation model, the real-time damage condition of the prestressed concrete bridge can be evaluated, and the damage degree of the bridge after being impacted can be quickly judged.

The invention discloses an anti-fatigue reinforcing device for a prestressed concrete electric pole, which belongs to the technical field of electric pole reinforcement and comprises two symmetrically arranged upper half rings, and a plurality of connecting plates are connected to the bottoms of the upper half rings. According to the electric pole supporting device, the upper half ring and the lower half ring can be tightly attached to the outer surface of an electric pole through mechanical transmission of a limiting and stabilizing assembly, a rotating rod, a first bevel gear, a second bevel gear and a movable lead screw, the supporting uniformity and firmness are ensured, and through the synergistic effect of a movable rod, a sleeve and a strong spring, lateral supporting is provided; shaking energy of the electric pole can be absorbed, long-term damage of vibration to the structure is reduced, the reinforcing effect on the electric pole is improved, auxiliary barbed nails can automatically go deep into soil through cooperation of a driving lead screw and a pushing block, the wind resistance and shock resistance of the whole device are further improved, the main barbed nails and the auxiliary barbed nails go deep into the ground for fixation, and the practicability is high. Inclination or displacement caused by external force is effectively resisted, and the stability and the anti-toppling capacity of the concrete pole are remarkably enhanced.

The invention is suitable for the technical field of concrete structure health monitoring, and provides an acoustic emission waveform-based concrete structure damage intelligent identification and evaluation method and system. The method comprises the steps of acoustic emission signal collection and microscomic damage synchronous monitoring, waveform feature extraction based on wavelet packet decomposition, intelligent clustering recognition of microscomic damage types and multi-parameter fusion damage evaluation model construction. According to the method, through multi-scale sensing arrangement, wavelet packet decomposition, a variational Bayesian Gaussian mixture model clustering algorithm and a multi-parameter fusion model, high-precision identification and quantitative evaluation of concrete structure damage are realized; the method has high recognition accuracy in complex structures such as steel fiber reinforced concrete and prestressed concrete, generalization ability is improved, and efficient and reliable technical support is provided for safe operation and maintenance of concrete structures.

The invention relates to a prestressed concrete hollow square pile surface treatment method which comprises the following steps: after a square pile is supported in a suspension manner, the vertex of the square pile is shifted downwards from the side, so that the square pile freely rotates downwards under the action of self gravity until the gravity center of the square pile is stable after the vertex of the square pile rotates from an initial position to a final position around a shaft; one-time rotating operation is completed, surface detection and treatment are conducted on the square pile, the rotating operation is repeated four times, the square pile rotates a circle, and detection and treatment of all the surfaces and the end faces of the square pile are completed; according to the surface treatment method, stable rotation of the pile body is achieved, the requirement for a power driving part is lowered, energy consumption is reduced, the surface of the pile body is completely exposed, and surface detection and treatment are facilitated.

The invention relates to a railway girder and truss integrated bridge shed and a construction method thereof. The railway girder and truss integrated bridge shed comprises low-height prestressed concrete box girders, truss web members, truss upper chords and cast-in-place reinforced concrete plates. The truss upper chord members are positioned on two transverse sides above the low-height prestressed concrete box girder and are longitudinally arranged; the truss web members are arranged on the two transverse sides of the low-height prestressed concrete box girder and are longitudinally inclined, the tops of the truss web members are fixedly connected to the truss upper chord members, and the bottoms of the truss web members are fixedly connected to the low-height prestressed concrete box girder; a cast-in-place reinforced concrete plate is arranged on the top of the truss upper chord, and the bottom of the cast-in-place reinforced concrete plate is poured into the truss upper chord, namely concrete is poured into the truss upper chord. The truss structure and the box girder are effectively connected, so that the truss not only bears the supporting effect of the protective component, but also forms a stress whole with the main girder, the defect that additional load of a traditional shed tunnel acts on the main girder is overcome, and the overall rigidity, stability and durability of the structure are remarkably improved.

The present invention relates to rebar-free prestressed concrete and to a forming method therefor. The rebar-free prestressed concrete comprises: a base layer which is a mortar, concrete or neat slurr