822 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 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 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 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 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 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 discloses a prestressed concrete H-shaped sheet pile and a construction method, and relates to the technical field of hydraulic engineering, the prestressed concrete H-shaped sheet pile comprises an H-shaped sheet pile body integrally formed by two flanges and a web plate, and further comprises prestressed steel bars arranged in the flanges and the web plate in the length direction of the sheet pile body, and the two ends of the sheet pile body are fixedly connected with reinforcing end covers. One face of the reinforcing end cover is connected with the prestressed steel bars, the other face of the reinforcing end cover is symmetrically provided with U-shaped inserting frames and inserting plates connected with the two U-shaped inserting frames, drainage grooves are formed in the two sides of the web, and river side drainage holes and shore side drainage holes communicated with the drainage grooves are formed in the two flanges respectively. U-shaped reinforcing ribs which are vertically distributed are arranged at the joints of the web and the flanges. By means of the prestressed reinforcement network arranged in the flanges and the web and the connection supporting structure of the U-shaped reinforcing ribs with the inclined top faces, the flanges on the shore side are more stable than the flanges on the other side, and the flexural capacity of the sheet pile is improved.

According to the ribbed plate assembly type prestressed concrete fan foundation and the installation method thereof, all the parts are prefabricated in a factory, then prefabricated parts are assembled on site, and the problem that the construction period of a cast-in-place foundation is long can be solved. Comprising a foundation outer ring, a foundation middle ring, a foundation pedestal and a foundation inner ring which are sequentially in butt joint from outside to inside in the radial direction. The foundation outer ring comprises a plurality of arc-shaped outer ring assembling bodies which are sequentially in butt joint in the circumferential direction. The foundation middle ring comprises a plurality of arc-shaped middle ring assembling bodies which are sequentially in butt joint in the circumferential direction. The basic pedestal comprises a plurality of arc-shaped pedestal assembling bodies which are sequentially in butt joint in the circumferential direction; the foundation inner ring comprises a plurality of arc-shaped inner ring assembling bodies which are sequentially in butt joint in the circumferential direction. The outer ring assembly body, the middle ring assembly body, the pedestal assembly body and the inner ring assembly body are all prefabricated parts; radial supporting rib plates are distributed on the outer circumferential surface and the inner circumferential surface of the foundation pedestal at intervals in the circumferential direction; prestressed steel strands are arranged in the supporting rib plates for tensioning.

The invention discloses a preparation method of a steel strand for prestressed concrete. By means of phosphorization and liquid nitrogen subzero treatment, the fatigue life of the prestressed steel strand can be effectively prolonged, and when the time of liquid nitrogen subzero treatment is 176 min, the fatigue life of the material reaches the optimal level. Meanwhile, the fatigue strength of the steel strand can be affected by overlong-time liquid nitrogen subzero treatment, so that the time of the liquid nitrogen subzero treatment is controlled to be 30-210 minutes during actual operation.

The utility model relates to the technical field of mold closing devices, and provides a mold closing device for prestressed concrete pipe pile production, which comprises a moving component and a supporting structure, the supporting structure is fixed at the top end of the moving component, a mold closing component is fixed at the top end of the supporting structure, and a central component is arranged in the mold closing component. Through the arrangement of the sliding mechanism, after the concrete pipe pile is formed, the fixing blocks are loosened, the mold bodies on the two sides are separated, then the mold bodies are pulled outwards, the friction force between the first sliding block and the base and between the second sliding block and the base can be reduced through balls at the bottom ends of the first sliding block and the second sliding block, and therefore the concrete pipe pile is formed. According to the mold closing device for prestressed concrete pipe pile production, the mold body is better moved, more labor is saved during movement, the function that the mold closing device has the function of facilitating movement and separation of the mold body is achieved, and the use convenience of the mold closing device for prestressed concrete pipe pile production is improved.

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 three-stand-column prestress hollow interlayer steel pipe concrete lattice type wind power tower system which comprises a three-stand-column lattice tower, a switching section, a steel tower section, a cabin, a hub and a wind wheel. The three-stand-column lattice tower is connected with the steel tower section through the switching section and used for achieving load transmission between the steel tower section and the three-stand-column lattice tower; the structural integrity and stress balance of the whole tower system are guaranteed, the cabin and the wind wheel are installed through a hub, and the cabin is located at the upper end of the steel tower section. A hydraulic-spring composite driving system (oil pushes a piston plate and springs rebound) is adopted, so that the bidirectional telescopic buckle achieves the automatic locking function, a traditional bolt connection mode is completely changed, the tower section splicing efficiency is improved by 300% or above through the standardized assembly process of staggered placement, buckle pre-fixing and hydraulic locking, and the tower section splicing quality is improved. The installation time of a single node is shortened to 5 minutes from traditional 15 minutes.

The invention discloses a mixed structure for reinforcing an existing concrete frame through an externally-attached self-resetting supporting frame and a construction method. The mixed structure is composed of the externally-attached self-resetting supporting frame, a prefabricated composition board and the existing concrete frame. Wherein the externally attached self-resetting supporting frame, the prefabricated composition board and the existing reinforced concrete frame are sequentially connected through pre-embedded U-shaped bolts and post-embedded anchor bolts. The externally-attached self-resetting supporting frame is composed of a prefabricated prestressed concrete column, a prefabricated prestressed hybrid beam, a self-resetting steel support and a prefabricated foundation. Wherein the prefabricated prestressed hybrid beams are connected with the prefabricated prestressed concrete columns through bolts; the prefabricated prestressed concrete column is connected with the prefabricated foundation through an embedded anchor bolt; the self-resetting steel supports are connected with the prefabricated prestressed concrete columns and the prefabricated prestressed hybrid beams through pin shafts, and in addition, the invention further provides a construction method of the frame. According to the invention, the low-disturbance, toughness and green anti-seismic enhancement of the existing concrete frame building can be effectively realized.

The utility model relates to the technical field of building equipment, and discloses a prestressed concrete laminated slab of a steel bar truss, which comprises a steel bar truss composed of steel bars, a prefabricated bottom plate and a grouting steel pipe, the steel bar at one end of the steel bar truss extends out of the prefabricated bottom plate and is provided with an adjusting component, and the grouting steel pipe is provided with a grouting hole. The grouting steel pipe is sleeved with the adjusting assembly. The height of the grouting steel pipe is adjustable, the rigidity of the laminated slab can be adjusted according to actual requirements, different application scenes and structure requirements often have different requirements for the rigidity of the laminated slab, the height-adjustable grouting steel pipe enables the laminated slab to better adapt to various conditions, and optimal adjustment of the rigidity is achieved; the overall rigidity and stress distribution of the laminated slab can be adjusted by adjusting the height of the grouting steel pipe, so that the laminated slab can reach a better stress state when bearing loads, the stress concentration and deformation risks are reduced, and the stability and safety of the whole structure are improved.

A jig frame supporting system of a special-shaped large-section annular prestressed concrete structural beam comprises a bearing platform, stand columns and stand column connecting rods, the stand columns are connected through the stand column connecting rods to form a frame body, and the bearing platform is arranged at the top of the frame body. The bearing platform is used for temporarily bearing the weight of the special-shaped large-section annular prestressed concrete structural beam and the template system thereof; the column connecting rod is horizontally or obliquely arranged; the bearing platform comprises profile steel keels arranged in a crisscross manner, and the bottoms of the profile steel keels are fixedly connected with the vertical rods through bolts; the bearing platform is connected with the stand columns through bolts, and the stand columns are connected with the stand column connecting rods through bolts. Compared with an existing plate buckle type scaffold supporting system, the jig frame supporting system has the advantages of being small in overall weight, high in bearing capacity, convenient to produce in batches, convenient and fast to install and low in labor requirement.