83 results about "Prestressed concrete" patented technology

The application relates to the technical field of building structures, in particular to a prestressed concrete structure performance monitoring method and system, which comprises the following steps: acquiring application environment parameters and performance monitoring data; determining external load tensile stress and external environment parameters according to the application environment parameters; determining stress loss data according to the performance monitoring data; respectively arranging the external load tensile stress, the external environment parameters and the stress loss data according to time nodes to obtain a concrete performance graph; collecting real-time application parameters and simulated performance data of the prestressed concrete structure in a current time period, and analyzing the real-time application parameters and the simulated performance data according to the concrete performance graph to obtain real-time performance monitoring data; and judging whether the real-time performance monitoring data is abnormal, if yes, generating performance warning information and sending the performance warning information to a target terminal. The application improves the performance monitoring accuracy of the prestressed concrete structure.

The utility model discloses a kind of assembled prestressed concrete column anti-splitting reinforcement devices, including concrete column main body, the concrete column main body is connected with reinforcing part, the reinforcing part includes: a plurality of prefabricated concrete boards, with concrete column main body surface adhesion;Several reinforcing strips, respectively inserted between concrete column main body and a plurality of prefabricated concrete boards, the utility model relates to concrete column anti-splitting reinforcement technical field.The assembled prestressed concrete column anti-splitting reinforcement device, let protective frame cooperate with spring, anti-drop strip, precast concrete board is resisted in concrete column main body surface and plays certain prestress treatment effect, precast concrete board cooperates with reinforcing strip and protective frame, and it plays reinforcing and anti-splitting effect to concrete column main body, and first mounting seat, second mounting seat, first bolt nut assembly, second bolt nut assembly, anti-drop component cooperate with each other, and support structure is installed on the outer side edge of protective frame.

1. Name of the product in this design: Ribbed planar steel truss prestressed concrete composite slab. 2. Purpose of this design: For use in building structures. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

This utility model relates to the field of civil engineering pile technology, and discloses a high-strength and durable prestressed concrete pipe pile for green building, including an outer cylinder. Multiple first reinforcing bars are fixedly connected inside the outer cylinder. An end cap is fixedly connected to one end of the outer cylinder, and a fixing member is fixedly connected to the other end. A cone is provided at the bottom of the fixing member, and a rotating ring is rotatably connected inside the fixing member. Multiple connecting members are fixedly connected to the bottom of the rotating ring. Multiple third fixing holes are opened on the surface of the fixing member, and a load-bearing component is provided inside the outer cylinder. In this utility model, by assembling the multiple first fixing holes with the fixing member, and then rotating the rotating ring to drive the connecting members to rotate, the rotating ring is engaged inside the connecting block. At this time, the connecting block, connecting members, and fixing member are fixed together by screws, thereby enabling rapid splicing and fixing of the outer cylinder and the bottom cone.

This invention discloses a ribbed prestressed concrete composite floor slab and its design method, relating to the field of prefabricated building structure design technology. The method includes calculating the total bearing capacity of prestressed steel bars required in the primary load-bearing direction and the total bearing capacity of ordinary steel bars required in the secondary load-bearing direction, based on the span and load parameters of the target floor slab. The reserved extension lengths of the two types of steel bars are determined according to the precast portion and the total thickness of the composite. The types, spacing, tensile stresses, and precise curve trajectory coordinates of the prestressed steel bars within the precast concrete are designed in detail, and the types, spacing, and arrangement coordinates of the ordinary steel bars are also designed. An internal reinforcement space model of the precast portion is generated based on the coordinate parameters of all steel bars, and a three-dimensional structural model of the ribbed precast template is generated by combining the geometric boundaries. This method achieves refined reinforcement design and digital expression of manufacturing information.

This application relates to a complete set of equipment for bidirectional prestressed concrete and a production method using the complete set of equipment, belonging to the field of prestressed pipe pile preparation technology. The bidirectional prestressed concrete equipment includes a hollow mold, a tensioning mechanism, and a centrifugal mechanism. A reinforcing cage and a tensioning plate are inserted into the mold. The tensioning plate is detachably connected to the end wall of the reinforcing cage. The tensioning mechanism drives the tensioning plate to move along the axis of the reinforcing cage, and the centrifugal mechanism drives the mold to rotate around the central axis of the reinforcing cage. It also includes a clamping element. A variable sealing gasket is inserted in the gap between the tensioning plate and the mold. The sealing gasket is arranged circumferentially along the tensioning plate, and the clamping element controls the deformation of the sealing gasket so that the sealing gasket simultaneously presses against the inner wall of the mold and the peripheral wall of the tensioning plate. This application optimizes the sealing effect of the sealing gasket on the gap between the tensioning plate and the mold, reducing the leakage of concrete from the gap.

This invention relates to a simulation test method for grouting of prestressed concrete bridge ducts, characterized by the following specific test steps: S1: Test design; S2: Equipment and material preparation; S3: Test commencement. This method addresses the problem that common duct grouting construction techniques, processes, and requirements cannot meet the needs of new grouting materials and equipment, such as "grouting from the lowest point." Some construction techniques have theoretical flaws, such as "flushing the duct before grouting and blowing away accumulated water with high-pressure air," and some lack reliable theoretical and practical basis. Therefore, it is necessary to study the influencing factors of duct grouting construction techniques based on current grouting materials, summarize the main factors affecting duct grouting quality, and propose an operable grouting process method.

This utility model discloses a novel prestressed concrete railway sleeper, comprising a sleeper body laid on the railway track bed, a reinforcing cage inside the sleeper body for increasing strength, two diagonally distributed "J"-shaped pre-embedded bolt assemblies located inside the sleeper body and extending upwards to both sides of the rail mounting position, two diagonally distributed fixing holes on the upper surface of the sleeper body located on both sides of the rail mounting position, a steel base fixed to the upper surface of the sleeper body by the pre-embedded bolt assemblies, and a steel pad installed on the upper end of the steel base through the fixing holes. This novel prestressed concrete railway sleeper effectively improves the track geometry retention capacity and load-bearing strength of the sleeper body; moreover, the two-layer steel plate structure has suitable deformation capacity, attenuating the impact energy transmitted to the concrete sleeper, greatly reducing the ballast pulverization rate, and ensuring safe vehicle operation.

The application provides a prestressed steel bar nondestructive detection method and system based on ultrasonic imaging, relates to the technical field of prestressed concrete structure nondestructive detection, and is characterized in that a quasi-distributed ultrasonic transmitting-receiving array is arranged along both sides of the prestressed steel bar, each probe is sequentially excited and a multi-path echo sequence signal is synchronously collected, Hilbert-Huang transformation is performed on each path signal, a marginal spectrum is obtained through empirical mode decomposition and Hilbert spectrum integration, a barycentric frequency is extracted as a characteristic value which is highly sensitive to interface stiffness degradation, the barycentric frequencies of all paths are taken as projection data, an algebraic iterative reconstruction algorithm is used in combination with the spatial coordinates of the probes, a dispersion characteristic tomographic image of the measured section is reconstructed, a barycentric frequency variation curve is extracted from the image along the direction of the steel bar, and the area where a continuous shift occurs and the shift amount exceeds a threshold value is determined as an interface stiffness abnormal area, so that two-dimensional imaging diagnosis and spatial positioning of the interface state of the prestressed steel bar are realized.

The utility model discloses a prestressed concrete variable core prefabricated pipe pile, including pipe pile body, the upper end of pipe pile body is equipped with the connecting groove, the inside of pipe pile body is linked with the connecting groove, just the connecting groove is the circular groove and is coaxial with pipe pile body and sets up, the lower end of pipe pile body is equipped with the connecting pipe, the connecting groove and pipe pile body form the support along of connecting pipe support between, the connecting pipe is coaxial fixed with pipe pile body, and adjacent two pipe pile body are connected through the connecting mechanism. The utility model discloses through the optimization connecting structure and mode, not only has improved the connection firmness and construction efficiency between pipe pile, still has strengthened the stability and security of whole building structure, has the remarkable economic benefits and social benefits.

This invention provides a bidirectional prestressed concrete creep testing device and method, relating to the technical fields of concrete testing technology and long-term structural deformation monitoring. The device includes: a concrete slab specimen; multiple prestressing units, disposed on the concrete slab specimen and bonded integrally with it, orthogonally distributed in the horizontal plane and multi-layered in the thickness direction, for applying bidirectional prestress to the concrete slab specimen; a testing unit for monitoring changes in prestress, temperature, and humidity of the concrete slab specimen; a boundary protection unit disposed on the sidewall of the concrete slab specimen to block lateral heat and moisture exchange, ensuring that temperature and humidity within the concrete slab specimen are transmitted only along the thickness direction; and a support frame on which the concrete slab specimen is mounted for suspended support, allowing ambient air to flow freely across the upper and lower surfaces of the concrete slab specimen.

This invention discloses a high-strength annular prestressed concrete pole and its preparation method, belonging to the technical field of concrete poles. The high-strength annular prestressed concrete pole comprises concrete and a prestressed reinforcement cage. The concrete contains silicate cement, silica fume, fine aggregate, coarse aggregate, a chloride-resistant component, a water-reducing agent, and water. The chloride-resistant component is prepared by emulsifying 15-17 parts of acrylate-styrene copolymer emulsion, 7-9 parts of cationic polymer, 2.5-3.5 parts of modified fluorinated nano-silica, 0.25-0.35 parts of blocked initiator, and 0.45-0.55 parts of migration promoter. During preparation, the aggregate and chloride-resistant component are first dry-mixed, water and admixtures are added in stages, and then the mixture is centrifuged, steam-cured, and subjected to gradient dehumidification curing. This invention, through the synergistic effect of the chloride-resistant component and curing process, significantly improves the pole's resistance to chloride corrosion and its strength, making it suitable for high-salt coastal environments and ensuring long-term stable service.

The present application relates to the field of prestressed concrete cylinder pipe detection, and particularly relates to a PCCP prestress failure signal acquisition and analysis system and method, comprising the following steps: an excitation coil and a magnetic sensor are arranged outside a prestressed steel wire layer of a PCCP pipe, the excitation coil is used to apply a low-frequency alternating excitation magnetic field to the prestressed steel wire layer, the magnetic sensor is used to acquire an eddy current magnetic field signal generated in the prestressed steel wire, and an initial electromagnetic signal of each measuring point is obtained; a strain gauge is fixedly connected between the excitation coil and the magnetic sensor, a resistance signal of the strain gauge is acquired in real time, and a state characteristic value reflecting a mechanical coupling state of a monitoring layer is extracted from the resistance signal. The present application combines the excitation coil, the magnetic sensor and an acousto-optic fiber sensor, cooperatively captures eddy current mutation and stress waves, introduces a strain gauge verification signal to improve reliability, and through confidence management and space-time correlation analysis, cross verification denoising, false negatives and false positives are reduced, and the positioning accuracy and diagnosis depth of broken wires are improved.

The utility model provides a kind of low pier column steel mixed combined portal pier structure, belong to bridge engineering technical field.It is composed of reinforced concrete pier column, pier top steel mixed structure combination section and prestressed concrete bent cap three parts, first construction reinforced concrete pier column when construction, and embed finish rolling screw thread steel in pier top;After reinforced concrete pier column concrete reaches design strength, install steel shell, and with the bolt connection of cover beam inner embedded steel plate;After that, cast-in-place prestressed concrete bent cap and tension prestressed steel bundle;Finally, press-in steel shell inner micro-expansion concrete, and in prestressed concrete bent cap top give finish rolling screw thread steel certain initial force, and the pipe and reserved round hole are carried out pressure grouting treatment.Set up steel mixed structure combination section between pier column top and prestressed concrete bent cap, realize load transmission path optimization, eliminate pier column secondary bending moment generated in cover beam prestressed tension stage thoroughly, significantly reduce the adverse effect of secondary bending moment to low pier column.

The utility model relates to concrete beam bearing detection technical field field discloses a kind of prestressed concrete low T beam bearing capacity detection devices, including the hydraulic cylinder of pressure exertion, and the T beam bearing frame of low T beam sample piece placement;The piston end of hydraulic cylinder is equipped with the detection mechanism located above T beam bearing frame;Detection mechanism includes several pressure exertion components to low T beam pressure exertion, and the connecting component connected between hydraulic cylinder and pressure exertion component;Connecting component includes I beam, and the support piece of I beam structure rigidity is arranged on I beam and is promoted, two sliding grooves are set up in I beam outside;Pressure exertion component includes pressure exertion piece, and two sliding pieces are arranged on the top of pressure exertion piece, and sliding piece slidingly connects in same side sliding groove;Pressure exertion piece top and I beam bottom abut.The utility model, can be according to actual demand to increase or reduce pressure point, improve the practicability of detection device.

This invention provides a construction method for prestressed concrete structures that allows for easy support of PC steel materials along with reinforcing bars. [Solution] A method for constructing a prestressed concrete structure, in which a plurality of spacers 4 are attached to the reinforcement structure 1, each spacer 4 integrally comprising a main body 5 attached to the lower reinforcement 20 and the PC steel material 3, a lower reinforcement support part 6 that supports the lower reinforcement 20 at a certain height from the bottom line L1 in the finished state of the prestressed concrete structure, and a PC steel material support part 7 that supports the PC steel material 3 at different heights set for each spacer 4 from the bottom line L1, and each spacer 4 is attached to the lower reinforcement 20 and concrete is poured with the PC steel material 3 supported in the deflected state.

A kind of wire withdrawal winding device.It relates to the technical field of wire winding machine of prestressed concrete pipe, including wire winding machine, the wire winding machine includes winding drum one, winding drum two, stress mechanism and wire reel, further include the winding mechanism for wire, the winding mechanism includes frame, lifting rod, push rod, slide bar and winding device one, the top of the lifting rod is fixedly connected to the bottom surface of the frame, the push rod is respectively arranged at the top surface of the frame both ends, the slide bar is fixed between the push rod of both ends, the winding device one is slidably arranged on the slide bar, and winding hole one is arranged on the winding device one;The winding mechanism is arranged between the winding drum one, winding drum two and the stress mechanism.The utility model has the beneficial effects that when wire winding machine is reversed to run wire withdrawal, ensure that the steel wire on winding drum is wound regularly and the winding tension is uniform.

The utility model discloses a prestressed concrete steel bar truss composite board, including prefabricated prestressed bottom layer, steel bar truss layer and cast-in-situ composite layer, its characterized in that: the top fixed connection of prefabricated prestressed bottom layer has steel bar truss layer, and the outside of steel bar truss layer and located the top pouring of prefabricated prestressed bottom layer has cast-in-situ composite layer, and the main body of prefabricated prestressed bottom layer is high -strength concrete pouring board. The utility model discloses through the innovative configuration of six straight steel strands and steel strand ring combination structure of prestressed steel strand, can form bidirectional prestressed system when the prefabricated bottom board bears load, and steel strand ring effectively restricts concrete transverse deformation, and straight steel strand provides longitudinal pre -stress, and the synergistic effect makes the bottom board crack resistance improve, adopts micro -inflation concrete pouring composite layer and through interface agent and enhances interlayer adhesion, solved the technical problems that traditional composite board is easy to appear interlayer peeling under the action of temperature difference shrinkage.

The utility model discloses a kind of fabricated prestressed concrete column reinforcing construction devices, the utility model relates to concrete column reinforcing technical field.The fabricated prestressed concrete column reinforcing construction device includes support plate, the upper portion of the support plate is provided with reinforcing mechanism, by adjusting assembly to apply prestress to concrete column, the reinforcing mechanism includes: support component, the position of adjusting assembly is limited by being arranged in the upper portion of support plate;Adjusting assembly includes the transmission rod and the limiting rod being arranged in the inboard of support component, the other end of the transmission rod and the limiting rod is movably installed with limiting plate, vertical component force generated by spring compression, transmission rod, connecting frame, support rod is transmitted to support plate, the relative pressure of support plate and mounting surface is increased, according to the friction formula, the friction of both is improved, hinder support plate sliding, strengthen bottom stability, form multidimensional anti-lateral displacement mechanism, compensate the defect that traditional device anti-lateral displacement capacity is insufficient.

This invention discloses a grouting corrugated steel pipe truss prestressed concrete composite slab. Firstly, the thickness of the precast base slab is rationally set to prevent excessive thickness, which would increase self-weight, waste materials, and increase compressive strength, making it difficult to detect cracks during stress and leading to direct breakage, including the reinforcing bars, thus altering the stress distribution and potentially causing collapse. Secondly, high-strength grouting steel pipe trusses and prestressed steel bars are used as the bottom reinforcement of the slab, significantly improving the load-bearing capacity of the precast slab. Furthermore, the special structure of the web members greatly enhances the connection performance of the composite slab. Finally, the area where the prestressed steel bars completely penetrate the precast base slab is rationally designed to prevent the end reinforcement from affecting the binding effect of the end beam reinforcement.

The utility model provides a kind of guiding device for prestressed concrete pile distribution system, including guiding slide, mobile carriage, slide bolster reinforcement structure, driving mechanism, traction structure, two sliding connection mechanisms, two side fixed plates and two catheter clamping mechanisms;Two side fixed plates are symmetrically arranged in the left and right sides of mobile carriage, two side fixed plates are integrally connected with mobile carriage, and slide bolster reinforcement structure is arranged on mobile carriage.The guiding device for prestressed concrete pile distribution system of the utility model solves the problem that the guide rail or mobile frame in the related art is prone to deformation under long-term load, causing the distribution position to easily deviate.

The present invention relates to a fabricated wharf structure, comprises a prefabricated concrete pile cap unit, composite pile foundation assembly and elastic fender module: pile cap unit is poured with fiber reinforced concrete with a fiber volume content of 1.2%—l.8%, a trapezoidal steel rail with a fiber content of 1.5-2.0 kg / m3 is pre-embedded in a side, nano—silica modified with methyl trimethoxysilane has a particle size of 10-20 nm and specific surface area of 180-220 mZ / g, is 3-5% of a mass of a cementing material, a polyurea waterproof layer of 2.0-2.5 mm is coated on a surface of a joint; composite pile foundation is a prestressed concrete pipe pile doped with 0.8%-1.2% silane corrosion inhibitor, and an anchoring steel bar with an epoxy resin coating is pre-embedded in a pile top. The structure is suitable for wharf construction in marine environment, and has long-term corrosion resistance, excellent impermeability and buffering performance.

This invention discloses an adjustable lateral friction prestressed concrete pipe pile and its manufacturing method. The prestressed concrete pipe pile includes a concrete pile body; a polymer functional sleeve is fitted onto the outer surface of the concrete pile body, and prestressed steel bars are arranged inside the concrete pile body; the outer surface of the polymer functional sleeve is arranged from top to bottom as a friction-reducing section, a transition section, and a deep friction-increasing section, specifically: the section 1 to 1.5 meters above and below the lower limit of the active layer is the transition section, the section above the transition section to the top of the pile is the friction-reducing section, and the section below the transition section is the deep friction-increasing section. This invention uses a polymer functional sleeve (FRP material) fitted onto the outer surface of the concrete pile body, which serves as a protective layer during construction and as a friction-adjusting functional layer and an anti-corrosion and durability layer during use, thus optimizing performance, lifespan, and economic benefits.

The application discloses a prestress calculation method and device for a non-bonded prestressed concrete containment reinforcement, and the method comprises the following steps: obtaining a first total deformation of a single non-bonded steel strand under a preset single load; obtaining a first unit stress variable of the non-bonded steel strand according to the first total deformation and an elastic modulus of the steel strand; obtaining a first compensation stress load required for a bonded steel strand to be converted into the non-bonded steel strand according to the first unit stress variable and a second unit stress variable of the bonded steel strand; and determining a first prestress of the non-bonded steel strand under the preset single load according to a second prestress of the bonded steel strand under the preset single load and the first compensation stress load. The application can more accurately determine the first prestress of the steel strand under the preset single load, thereby providing support for subsequent stress calculation of concrete in a load combination condition in the design of a non-bonded prestressed concrete containment.

As shown in the reference perspective view illustrating the state of use, this item is installed on top of the steel pipe piles of a PC pier and connects to multiple precast concrete girders spanning between the steel pipe piles by tensioning and anchoring PC steel wires through multiple holes formed on the front, back, and left and right sides, respectively.

This invention discloses a high-friction, low-thermal-conductivity prestressed concrete pipe pile processing device, belonging to the field of concrete pipe pile processing technology. The device includes a mold, a drive unit, and a connecting shaft. It also includes a mixing mechanism comprising a mixing paddle and a telescopic mechanism. The telescopic mechanism drives the mixing paddle to move radially along the mold, and the mixing paddle mixes the concrete raw materials inside the reinforcing cage. A moisture content meter detects the real-time moisture content of the concrete raw materials. When the real-time moisture content is less than a threshold value, the controller controls the telescopic mechanism to contract, so that the distance from the sidewall of the mixing paddle to the axis of the connecting shaft is equal to the designed inner diameter of the pre-processed pipe pile, and the length direction of the mixing paddle is parallel to the axial direction of the mold. This high-friction, low-thermal-conductivity prestressed concrete pipe pile processing device can suppress the segregation of fly ash hollow microspheres, avoid powder shedding from the inner wall, and increase the friction of the processed pipe pile.

The application provides a prestress guarantee rate obtaining method and system considering prestress fluctuation, comprising the following steps: S1: establishing a physical mapping relationship between temperature change and prestress fluctuation of the prestressed reinforcement; S2: constructing a double-branch physical information neural network, and predicting the temperature change distribution of the prestressed reinforcement at different depths in the bonded prestressed concrete structure based on historical meteorological data of the location of the bonded prestressed concrete structure; S3: determining the probability distribution characteristics of the prestress fluctuation of the prestressed reinforcement according to the physical mapping relationship and the temperature change distribution; S4: constructing a prestress loss reference curve, and coupling the probability distribution characteristics with the prestress loss reference curve to obtain the probability distribution of the actual prestress at any time; and S5: setting a prestress safety threshold, calculating the time proportion of the actual prestress value being higher than the prestress safety threshold within a target evaluation period based on the probability distribution, and defining the time proportion as the prestress guarantee rate considering the prestress fluctuation.

The application provides a tool for fast installation of prestressed steel strand clamps and a construction method. The tool comprises a positioning body which penetrates through the end portions of a plurality of steel strands, cooperates with the steel strands in a gap mode, and can push a plurality of clamps to move simultaneously along the steel strands towards an anchor head. The application has the beneficial effects of realizing fast and accurate installation of large prestressed concrete steel strand clamps, improving the problems of low efficiency and poor installation accuracy of the traditional construction method, greatly shortening the construction period, saving labor cost, and being simple in structure and convenient to operate.

The application belongs to the technical field of steel strand preparation, and particularly relates to a 2230 MPa steel strand for prestressed concrete and a preparation method thereof. The 2230 MPa steel strand for concrete comprises the following raw materials in percentage by mass: C 0.90-0.95wt%, Mn 0.30-0.90wt%, Si 0.10-1.20wt%, Ta 0.15-0.28wt%, Sc 0.07-0.12wt%, Pr 0.04-0.08wt%, P≤0.020wt%, Cr≤0.40wt%, S≤0.020wt%, Ni≤0.10wt%, Cu≤0.20wt%, V≤0.15wt%, and the balance is Fe. The application can improve the mechanical properties and corrosion resistance of the steel strand by adding C, Mn, Cr, Ta, Sc, Pr and other elements for micro-alloying.

The present application relates to the field of building construction technology, and specifically to a prestressed concrete square pile auxiliary connector, which comprises a clamping assembly, the clamping assembly is bent from a steel plate, the inside of the clamping assembly is a groove structure for covering and fixing the end of the lower section square pile; a positioning assembly, the positioning assembly comprises positioning bolts and positioning holes around the clamping assembly, the positioning holes are pre-set in the square pile body, and the positioning bolts are inserted into the positioning holes pre-set in the square pile body; a connecting and fastening assembly, the connecting and fastening assembly comprises a connecting plate and connecting bolts, the connecting bolts pass through the connecting plate and are threadedly connected with the clamping assembly; a level, the level is placed outside the clamping assembly and is used for assisting in calibrating the perpendicularity of the pile body. The present application discards the operation mode of needing multiple workers to cooperate and repeatedly position in the traditional welding connection, and one person can complete the butt joint and calibration of the square pile, which significantly improves the construction progress and reduces the personnel configuration demand in high-altitude or narrow working surface.