1285 results about "Prestressed concrete" patented technology

The invention relates to the technical field of concrete tower footings, and discloses a fabricated prestressed concrete tower footing for a land wind turbine generator and a construction method, a bottom framework is placed in a foundation pit under the supporting action of a corresponding supporting frame, and an annular seat penetrates through the supporting frame and realizes positioning of the supporting frame; the inner framework is supported at the center in the outer framework; under the combined action of the top fixing mechanism and the bottom fixing mechanism, the outer framework and the inner framework are kept vertical. By arranging the inner framework, the outer framework can be supported, the inner framework and the outer framework form a whole after the concrete is solidified, and the overall structural strength is high. Under the combined action of the top fixing mechanism and the bottom fixing mechanism, the space between the outer framework and the inner framework can be ensured to be consistent up and down, and the relative positions of the outer framework and the inner framework are prevented from deviating during concrete pouring, so that the overall structural strength of the outer framework and the inner framework meets the requirement after the concrete is solidified.

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 a monitoring control system for static pressure pile machine construction. The monitoring control system comprises a central control system, a man-machine interaction screen display module, a static pressure pile machine operation module, a construction data acquisition module, a welding quality monitoring module, a pile foundation bearing capacity prediction module and a cloud data storage and presentation module. The invention further discloses an implementation method of the monitoring control system for static pressure pile machine construction. Through linkage of the central control system and the static pressure pile machine, efficient automation and accurate control of the construction process are achieved; in the construction process, the leveling and pile pressing operation of the pile clamping platform and the pile pressing platform can be regulated and controlled through construction data collected in real time, it is ensured that the prestressed concrete pile vertically enters the soil and reaches the designed pile pressing depth, and deviation is avoided; the welding quality monitoring module can monitor the welding quality in real time, and it is ensured that the construction quality meets the standard.

The invention relates to a pipe pile grouting expanded head pile forming process special for a prestressed concrete water jet cutter and a pipe, and belongs to the field of pipe pile construction. The large-head concrete block is integrally connected with the lower end of the tubular pile body and is in an irregular shape, the tubular pile body sequentially comprises a pile cap, a plurality of pipe joints and an inverted-cone-shaped pile head from top to bottom, the tubular pile body is provided with at least one high-pressure water or cement paste channel in the axial direction of the tubular pile body, and the pile head is provided with a material water hole communicated with the high-pressure water or cement paste channel. During construction, even if a special stratum is encountered, the hard stratum is impacted through the high-pressure water jet cutter, and static pressure or hammering is matched, so that the problem that an existing pipe pile is difficult to descend is solved. When the designed elevation is reached, guniting is carried out through high-pressure water or a cement paste channel in the pipe pile body, and a sphere-like expanded head is formed at the bottom of the pipe pile; the bearing capacity of a single pile can be improved, settlement of the pile body is limited, local displacement of the pile body is eliminated, and the anti-floating effect of the pile body is achieved.

The invention discloses a variable-cross-section stacked box rigid frame aqueduct, a cantilever hanging basket and a prestress tensioning method in the field of prestressed concrete aqueducts, the transverse section of a water passing groove is a U-shaped section, and the U-shaped section of the water passing groove is far superior to a rectangular section in the aspects of water delivery flow conditions and flow passing capacity; a prestress continuous rigid frame structure form of a U-shaped water passing upper tank with a variable cross-section rectangular lower tank stacked upwards and a guide groove unified cross section and a two-system four-way prestress system are arranged, the concrete stress of the upstream face of the U-shaped water passing groove can be accurately and effectively controlled to be kept in a uniform compression state with a certain numerical value, and the anti-seepage and durability functions of the aqueduct are ensured. According to the tensioning method, the vertical steel beams and the U-shaped steel beams are partially tensioned firstly, so that the aqueduct web has certain vertical pressure stress, then longitudinal prestress is tensioned, the effect of the vertical steel beams and the U-shaped steel beams is prevented from being weakened by the longitudinal prestress, and pressure stress reserve of the upstream face of the U-shaped groove is guaranteed; the pouring hanging basket prevents the formwork from floating or shifting in the pouring process of the variable-thickness middle partition plate.

The invention discloses a steel-concrete combined containment connection node, and relates to the technical field of nuclear power, a steel containment cylinder is embedded into concrete in a prestressed concrete containment cylinder, the steel containment cylinder is provided with a stiffening rib ring plate, and longitudinal prestressed reinforcements in the prestressed concrete containment cylinder are connected with the stiffening rib ring plate; the longitudinal prestressed reinforcements are tensioned at the bottom ring corridor of the prestressed concrete containment cylinder to form a tensioning corridor; and circumferential prestressed tendons are also arranged in the concrete of the prestressed concrete containment cylinder, and are tensioned at the buttress columns. Through the combined action of the stiffening ribs on the steel containment and the prestressed tendons in the concrete containment, the overall rigidity of the containment is enhanced, and the integrity of the containment is guaranteed under the condition that an accident occurs.

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 invention discloses an assembly type segmented prestressed concrete tower drum structure and a construction method, the assembly type segmented prestressed concrete tower drum structure comprises a drum body formed by splicing a plurality of concrete drum sections in a segmented mode in the height direction, the diameter of the concrete drum sections is reduced in the height direction of the drum body, and the concrete drum sections are formed by splicing a plurality of prefabricated pipe pieces into a whole through bent bolts. The fabricated prestressed concrete structure is adopted, and the bearing capacity, rigidity and crack resistance of the tower drum are remarkably improved. The segmented prestress can change the prestress value gradient of the tower barrels with different heights, the performance design of the tower barrels is achieved to meet the requirements of different scenes, and the fatigue life and the service cycle of the tower barrels are prolonged. Prefabricated pipe pieces are produced in a factory in a standardized mode, prestress is tensioned, on-site overall prestress tensioning is avoided, the construction efficiency and the construction quality are improved, only embedded bolt connection needs to be completed on site, construction is convenient and fast, connection is reliable, and wide application prospects are achieved.

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 relates to the technical field of offshore wind power generation, in particular to a semi-submersible floating fan foundation, a system and a design method. The semi-submersible floating fan foundation comprises a middle buoy and at least three side buoys arranged around the middle buoy, bases are poured at the bottoms of the side buoys, and prestressed concrete box girders are connected between the adjacent side buoys. The semi-submersible type floating fan foundation provided by the invention can be used for bearing an offshore fan, and the effective displacement of the fan foundation can be greatly improved by adopting a form of combining the floating barrels and the box girders, so that the fan foundation has higher bearing capacity; the box girders are prestressed concrete box girders, so that the higher structural strength and rigidity and excellent crack resistance and durability of the prestressed concrete box girders can be utilized to save part of steel bar and concrete cost under the condition of meeting the bearing requirement and the stability requirement of the offshore wind turbine, thereby being beneficial to improving the overall economic benefit of offshore wind turbine engineering; and large-scale commercial use of the offshore wind turbine can be realized.

The invention discloses an intelligent welding device for prestressed concrete pipe pile connection and a welding method thereof, and relates to the technical field of welding devices.The first supporting frame is provided with a second clamping and positioning mechanism used for clamping a second concrete pipe pile, and the third supporting frame is provided with a first clamping and positioning mechanism used for clamping a first concrete pipe pile; the second supporting frame is provided with a welding structure for welding the joint of the second concrete pipe pile and the first concrete pipe pile. A first concrete pipe pile is clamped and positioned through a plurality of first positioning rods, a second concrete pipe pile is clamped and positioned through a plurality of second positioning rods, the position accuracy of the connecting positions of precast piles can be guaranteed, meanwhile, the position of a welding gun in the horizontal direction is adjusted, the position of the welding gun in the vertical direction is adjusted, and the welding efficiency is improved. And the connecting position of the second concrete pipe pile and the first concrete pipe pile can be welded, and the beneficial effects of being high in welding quality and good in welding stability are 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 relates to a continuous rigid frame bridge capable of reducing mid-span downwarping of a main beam and a construction method, and belongs to the technical field of bridge engineering. Comprising a plurality of web sagging moment prestressed steel beams, a main beam and a plurality of piers, the web sagging moment prestressed steel beams are composed of two first steel beams, two second steel beams and a third steel beam, two main beam webs and a plurality of main beam toothed plates are arranged in the main beam, the first steel beams are arranged above the third steel beam, and the first steel beams and the third steel beam are horizontally arranged; the two ends of the third steel beam are connected with the two first steel beams in a one-to-one correspondence mode through the two second steel beams, the second steel beams are in arc transition connection with the first steel beams and the third steel beams, the first steel beams, the second steel beams and the third steel beams are all arranged in a main beam web, and the ends, away from the second steel beams, of the first steel beams are anchored to a main beam toothed plate. And the third steel beam is arranged at the lower part of the main beam web. According to the invention, the problem of down-warping of the prestressed concrete continuous rigid frame bridge caused by the radial acting force of the prestressed steel beams of the bottom plate is solved.

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 PCCP (prestressed concrete cylinder pipe) with multi-layer protection and a manufacturing method thereof, and particularly relates to the technical field of prestressed concrete cylinder pipes. The PCCP with the multi-layer protection comprises an inner concrete layer, a steel cylinder arranged on the outer ring of the inner concrete layer, an outer concrete layer arranged on the outer ring of the steel cylinder, a prestressed steel wire wound on the outer ring of the outer concrete layer, an inner protection layer coated on the outer side of the prestressed steel wire and used for wrapping the prestressed steel wire, and a middle protection layer coated on the outer side of the inner protection layer and used for wrapping the prestressed steel wire. And an outer protective layer is arranged on the outer side of the middle protective layer. According to the PCCP with the multi-layer protection, through multi-layer protection and strengthening measures, excellent performance and long-term durability are achieved, each structural layer plays a role independently and promotes other layers mutually to jointly form an efficient and stable system, and the overall performance and durability are 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 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 discloses a concrete creep test method considering a plateau severe environment, which comprises the following steps: preparing a concrete member in the plateau severe environment, and embedding and installing test equipment; pre-stress is applied to the concrete member in a grading mode, and the load value of the applied pre-stress is calculated according to the number of the steel strands installed in the test piece and the area of the single steel strand; acquiring stress parameter change data of the concrete creep model by adopting an automatic acquisition device; a climate testing device is installed in the severe plateau environment to test meteorological parameters such as wind speed, temperature, humidity, ultraviolet coefficient, altitude and oxygen content; the structural stress and meteorological parameters are applied to the analysis model, and the concrete creep performance considering the severe plateau environment is obtained. According to the method, the creep performance of the concrete in the severe plateau environment can be obtained, and technical support is provided for obtaining the creep characteristics of the prestressed concrete structure.

The utility model relates to an assembly type prestressed concrete ecological supporting retaining wall, which belongs to the technical field of bank protection and comprises a prestressed supporting retaining wall column, wing edge ecological retaining wall plates are fixedly connected to two sides of the prestressed supporting retaining wall column with the middle protruding, a male tenon is fixedly connected to one wing edge ecological retaining wall plate, and a female tenon is fixedly connected to the other wing edge ecological retaining wall plate. The other winged ecological retaining wall plate is provided with a female tenon for the male tenon to be connected in an attached and inserted mode, the prestressed supporting retaining wall column is provided with a hoisting hole, and the winged ecological retaining wall plate is provided with a plant planting ecological bin. The fabricated prestressed concrete ecological supporting retaining wall can be composed of a prestressed supporting retaining wall column with the middle protruding, a left wing retaining wall plate, a right wing retaining wall plate, female tenons and male tenons, wherein the left wing retaining wall plate and the right wing retaining wall plate are connected with the prestressed supporting retaining wall column; the pre-stressed concrete ecological support retaining wall meets the requirements of bank protection and support, provides a place for reproduction of aquatic animals, and really achieves concrete ecological support.

A use method of the test device for simulating ion erosion of the PCCP protective layer comprises the following steps: S1, region division: selecting a test object, and firstly dividing the test object into four regions, namely a region I, a region II, a region III and a region IV; dividing each subarea into three test areas, namely a test area A, a test area B and a test area C; s2, making a test plan: executing sulfate ion erosion comparison in a partition I, executing chloride ion erosion comparison in a partition II, executing protective measure comparison in a partition III, and executing a mixed comparison test in a partition IV; s3, making a comparison scheme; s4, making a dry-wet cycle scheme; s5, preparing test conditions; s6, liquid filling is executed; s7, executing a dry-wet cycle; s8, judging whether the dry-wet cycle needs to be ended or not: if Seq is equal to L, ending the dry-wet cycle, and continuing S9; otherwise, indicating that all times of dry-wet cycle treatment is not completed, and returning to S6; s9, extracting a sample; and S10, analyzing a result.

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 present disclosure provides a production method and a mold for a ribbed prestressed composite slab of self-compacting concrete, including a long-line table bottom mold, side molds, end molds and a top mold. Side molds are respectively connected to the long ends of the long-line table bottom mold. The top mold is arranged at the upper end of the long-line table bottom mold, and both ends of the top mold are respectively connected to the corresponding side molds. End molds are respectively connected to the short ends of the long-line table bottom mold, and the shape of the upper edge of the end mold matches the shape of the side edge of the top mold. Both ends of the end mold are respectively connected to the corresponding side molds to form a cavity with an accommodating space. A number of holes through which prestressed steel wires can pass are provided on the end mold, and leak-proof plugs are detachably connected to the holes. The structure of the present disclosure is simple, which can make the construction of prestressed concrete composite slabs faster and more convenient, and at the same time can reduce the labor intensity of workers and improve production efficiency.

The invention discloses a prestressed concrete pipe pile splicing quality online monitoring system which comprises a high-definition visual acquisition module, an infrared sensing thermal imaging acquisition module, a welding machine working parameter acquisition module, a data processing module, an algorithm analysis module, a man-machine interaction screen display module and a cloud storage presentation training module. The invention further discloses an implementation method of the prestressed concrete pipe pile splicing quality online monitoring system. Through the high-definition visual acquisition module, the infrared thermal imaging acquisition module and the welding machine working parameter acquisition module, comprehensive monitoring of the welding process is realized; the cloud storage presentation training module receives data from the data processing module through a 5G communication network, efficient storage, display and model iteration training are carried out, quantitative evaluation and diagnosis of the pile splicing quality of the prestressed concrete pipe pile are achieved, the reliability of the welding quality is ensured, and the construction quality of the prestressed concrete pipe pile is improved.

The invention belongs to the field of building and foundation engineering, and discloses a tubular pile vertical bearing capacity prediction method based on deep learning. The detection precision of the vertical bearing capacity of the prestressed concrete pipe pile is improved. A convolutional neural network (CNN) and a long short-term memory network (LSTM) are introduced, sensor monitoring data and field test results are combined, a pile foundation bearing capacity prediction model is optimized, and the pile foundation bearing capacity is evaluated more accurately.