68 results about "Prestressed structure" patented technology

The invention relates to the technical field of prestressed structures, in particular to a fully parameterized prestressed steel beam model construction method and system.The fully parameterized prestressed steel beam model construction method comprises the following steps that stage vertical displacement data are obtained, abnormal values are screened out, a stage data set is obtained, node data are selected according to the steel beam path relation, and differences are calculated and sorted; the method comprises the steps of dynamically monitoring node displacement, correcting node tension values in combination with friction resistance and anchorage device slippage, screening support node abnormity, finely adjusting node positions, extracting temperature data, adjusting node tension parameters and obtaining a full-parameterization steel beam layout data set, and in the method, node displacement is dynamically monitored, the displacement difference of starting and ending nodes of a steel beam path is adjusted, node tension force is corrected in real time, and a full-parameterization steel beam layout data set is obtained. And a full-parameterization steel beam layout data set is obtained by combining the support node displacement and the temperature change and optimizing the tension parameters, so that the structure is matched with the dynamic change in the construction process, and the adaptability and the long-term reliability of the structure are enhanced.

The invention relates to the technical field of building detection, and discloses a building retard-bonded prestress intelligent detection method based on the Internet of Things. The method comprises the steps of collecting and preprocessing real-time monitoring data of the retard-bonded prestressed structure through an Internet of Things platform, and filtering interference signals to improve data quality; classifying the preprocessed data according to a preset stress state interval, and extracting time-space domain features of each interval to generate a stress feature set; detecting the change frequency of the stress state interval, and starting a dynamic adjustment mechanism to mark an abnormal interval if the change frequency exceeds a threshold value; according to the matching degree of the historical damage mode of the structure and the current feature, a non-abnormal interval stress feature set is decomposed to generate a damage feature subset, multi-parameter collaborative correction is carried out in combination with the incidence relation of material mechanics and environmental action parameters, and finally the position of a potential damage source is reversely traced along a damage evolution path. And determining a maintenance priority and generating a maintenance instruction.

The utility model provides a cross-section-variable box girder midspan bottom plate transverse prestress structure, and belongs to the technical field of box girder construction. Comprising a top plate, flange plates are arranged on the two sides of the top plate, top plate transverse prestressed steel beams are arranged below the top plate, vertical prestressed tendons and webs are arranged between the top plate and the flange plates, and bottom plates are connected to the lower portions of the vertical prestressed tendons and the webs and provided with bottom plate transverse prestressed steel beams and bottom plate longitudinal prestressed steel beams. And the bottom plate transverse prestressed steel beams and the bottom plate longitudinal prestressed steel beams are tensioned. By applying transverse prestress to the midspan bottom plate of the variable cross-section box girder, splitting force and other transverse force generated by longitudinal prestress of the bottom plate are eliminated, the bottom plate is prevented from generating longitudinal cracks, and it is guaranteed that the structure is safe and durable; diseases such as cracking and overlarge downwarping of the variable cross-section box girder can be greatly avoided, and the service life of the structure is prolonged.

The present invention discloses a method for determining the equivalent pretension of cables. The method is based on nonlinear implicit equation construction and the Steffensen iteration method. Under the condition that the structural load and support state are known, the cable force value under the load state is targeted. Considering geometric nonlinear effects, the problem of determining the equivalent pretension of cables is transformed into the problem of solving multiple relatively independent nonlinear implicit equations. An iterative formula for the equivalent pretension is constructed based on the principle of the Steffensen iteration method. A set of equivalent pretensions of cables with a cable force error within an allowable error range is obtained through cyclic iterative solutions. This method has a small number of iterations, a short solution time, and has a convergence efficiency of second order or higher, high applicability, outstanding computational efficiency, and stability. It is widely applicable to the problem of determining the equivalent pretension of cables in various prestressed structures.

The utility model discloses a prefabricated pre-tensioned prestressed reinforced concrete outer wall concrete hanging plate which comprises keels and a concrete hanging plate, the number of the keels is two, a plurality of first steel connectors are arranged on the two keels at intervals, a second steel connector is arranged on one side of each first steel connector, the concrete hanging plate is arranged on the two keels, and the second steel connector is arranged on the other side of each first steel connector. The concrete hanging plate is fixed through the second steel corner connector and comprises a rib framework and a concrete plate poured on the rib framework, and light holes are formed in the concrete plate. The concrete hanging plate has the advantages of being simple in structure, reasonable in design, convenient to install, time-saving and labor-saving in installation, meanwhile, the concrete hanging plate is additionally provided with a pre-tensioning prestress structure, the deflection of the concrete blocks is increased, the concrete blocks of the same size can be lightened, the capacity that one hanging plate covers multiple layers can be achieved, and the concrete hanging plate is worthy of being widely applied and popularized.

The utility model belongs to the technical field of prestressed anchorage devices, and particularly relates to a prestressed steel strand pulling device. According to the utility model, the pre-stressed steel strands are suspended and separated through the front-end moving frame, the middle supporting frame and the tail-end limiting disc which are sequentially arranged at intervals, so that the risk of winding and crossing phenomena of the pre-stressed steel strands in the strand pulling process can be reduced; meanwhile, the prestressed steel strand is driven to penetrate through the first rolling device and the second rolling device, and friction between the prestressed steel strand and the corrugated pipe is reduced. The device is high in adaptability and good in universality and adaptability, and can be widely applied to various prestressed structure projects such as bridges and aqueducts.

This invention relates to the field of aqueduct construction technology, and discloses a method for on-site construction of a U-shaped aqueduct body based on a self-propelled trenching machine, as well as the self-propelled trenching machine itself. It aims to solve the technical problems of poor structural adaptability, insufficient construction stability, difficulty in precision control under complex working conditions, and inefficient construction organization when using conventional bridge mobile formwork for the construction of large-span U-shaped thin-shell aqueducts in the prior art. The invention includes the following steps: S1. Equipment assembly and anti-overturning reinforcement; S2. Pre-stressing and positioning of the formwork structure; S3. Installation of reinforcing steel and prestressed structure; S4. Positioning of the inner formwork anti-buoyancy structure; S5. Concrete pouring and curing; S6. Prestressing tensioning and grouting; S7. Equipment demolding and longitudinal movement through holes; S8. Formwork closing and cyclic construction. The self-propelled trenching machine of this invention, by setting a horizontally opening and closing lower hanging beam and a foldable hydraulic inner formwork structure, enables the formwork to accurately adapt to the complex hyperboloid contour and ultra-large width of the U-shaped aqueduct, solving the structural adaptability problem of conventional formwork.

This invention belongs to the field of underground engineering tunnel equipment technology, and discloses a prestressed structure for tunnel boring machine (TBM) segments, a tensioning device, and a tensioning method. The prestressed structure for TBM segments includes segments, steel pipes, double-ended studs, nuts, a first washer, a clamp, and a connector. The segments have receiving holes, the steel pipes are inserted into these holes, and the double-ended studs are inserted into the steel pipes, with both ends of the studs protruding from the ends of the steel pipes. The nuts include a first nut and a second nut; the first nut is screwed to the first end of the double-ended stud, and the second nut is screwed to the second end of the double-ended stud. The first washer is fitted onto the first end of the double-ended stud and is located between the first nut and the segments. The clamp is located between the inner wall of the first washer and the outer wall of the double-ended stud. The connector has a tubular structure, with internal threads on its inner wall, and is connected to the first end of the double-ended stud. The prestressed structure for TBM segments provided by this invention can effectively prevent deformation or loosening during the shield tail disengagement process.

The utility model discloses a prestressed steel strand tensioning device, which relates to the technical field of prestressed construction, and comprises a tensioning mechanism, the tensioning mechanism comprises a jack and a fixing pipe, one end of the fixing pipe is fixedly connected with one end of the jack, a motor drives a driving gear and a driven gear to rotate, so that a threaded rod rotates, and the tensioning mechanism is driven to rotate. The movable seat drives the positioning disc to move, the positioning disc pulls out the positioning pipe in the process of moving along the inner wall of the square pipe, the multiple steel strands are quickly and accurately positioned in the mode that the fixed disc, the positioning disc and the positioning pipe are combined, the straightness of the steel strands is guaranteed, the stress tensioning effect of the steel strands is improved, and the stress tensioning effect of the steel strands is improved. Meanwhile, in the tensioning process, the stress sensor monitors the tensioning stress borne by the steel strand in real time, the displacement sensor measures the elongation of the steel strand, precise control over the tensioning stress and the elongation of the prestressed steel strand is achieved, the tensioning precision is improved, and the quality and safety of a prestressed structure are guaranteed.

The invention provides a multi-source data fusion prestressed structure health monitoring and early warning method, and relates to the technical field of constructional engineering structure health monitoring, and the method comprises the steps: carrying out the processing of a self-adaptive weighted data fusion model based on monitoring data obtained by a sensor, so as to output a prestressed comprehensive loss rate, the monitoring data comprises axial strain field data of the steel strand, and displacement and tensioning force of an anchorage device clamping piece; based on the historical sequence, an LSTM prediction model is improved to output a future trend prediction value; based on the future trend prediction value, the prestress comprehensive loss rate, the anchorage device clamping piece displacement and the tensioning force, performing evaluation through a failure probability model based on a fuzzy Petr network to obtain a real-time failure probability; and comparing and judging the future trend prediction value and the real-time failure probability with a preset threshold value to generate early warning information.

The invention belongs to the technical field of prestressed structure construction, and particularly relates to a metal corrugated pipe construction device in a prestressed structure, which comprises a front pipe sleeve, a rear pipe sleeve, a connecting rod and a connecting rod, the three front supporting blocks are arranged on the front pipe sleeve at equal intervals, and the radial positions of the front supporting blocks on the front pipe sleeve can be adjusted; the rear pipe sleeve is used for being arranged at the front end of the next metal corrugated pipe in a sleeving mode and located on the rear side of the opening end. And the multiple rear supporting blocks are sequentially arranged in the rear pipe sleeve in the circumferential direction, each rear supporting block comprises a transverse rod, and when the rear supporting blocks move inwards on the rear pipe sleeve in the radial direction to the innermost position, the transverse rods are inserted into annular grooves in the surface of the metal corrugated pipe. The device has the advantages that the casing operation of the metal corrugated pipe is facilitated, the casing operation efficiency is improved, the surface of a casing area is cleaned synchronously, and the adhesive tape winding effect is improved.

The utility model discloses a body outside prestress structure for reinforcing masonry structure house, including masonry mechanism and tightening mechanism, the masonry mechanism includes building block, multiple steel strand bundles transversely throughout the both ends of building block, tightening mechanism, the tightening mechanism includes multiple fixed line cover of the movable sleeve joint in multiple steel strand bundles both ends. In the utility model, after steel strand bundle transversely throughout building block, the fixed line cover is sleeved in the outside end part of steel strand bundle, passes through the rotation screw rod, drives two pressure blocks and inserts the inside of fixed line cover and moves back to, then the vertical embedding of axle is inserted in the stranding gap of steel strand bundle, and the radial compression of steel strand bundle line body is realized to pressure block simultaneously, and this double fixed structure effectively promotes the combination intensity of fixed line cover and steel strand bundle, can prevent both from separating in hydraulic tensioning operation, can also ensure the uniform transmission of load in the tensioning process, thereby guaranteeing the stable implementation of hydraulic system operation.

The application provides a prestressed structure hole pressure grouting density detection system and method. The signal excitation device is adopted to generate an impact elastic wave at an excitation point of the prestressed structure hole, and then the signal characteristics of the impact reflected wave at a symmetrical position relative to the monitored point are analyzed to determine the pressure grouting density of the monitored point in the prestressed structure hole. The application solves the problems of low detection efficiency and uncontrollable vibration source signal of the pressure grouting density detection device in the prior art, and has the technical effects of improving the detection efficiency of the pressure grouting density detection device and controlling the vibration source signal.

The invention discloses a prestressed energy storage rib, and relates to the technical field of prestressed structure engineering and building energy storage, in particular to a prestressed concrete beam, and a prestressed energy storage rib body is arranged in the prestressed concrete beam. When the prestressed energy storage rib is used, the prestressed energy storage rib body is composed of a high-strength hollow FRP rib and a battery unit packaged in the high-strength hollow FRP rib. The anchoring electrical integrated end is a core innovation, integrates a mechanical anchoring module, an electrical insulation module and a circuit interface module, disperses anchoring stress through a local reinforcing structure to protect an internal battery cell, realizes electrical isolation by using an insulation isolation sleeve, and ensures reliable connection of a tensioned circuit by using a connecting piece with elastic compensation. The invention further provides a construction method of tensioning and anchoring first and then electrical connection, integration of a building structure and energy storage is achieved, and safe and reliable self-energy-storage capacity is given to major infrastructures.

The invention discloses a weldable metal ceramic composite pipe and a preparation process thereof, and relates to the technical field of pipelines, the weldable metal ceramic composite pipe comprises a steel pipe main body, the pipe wall of the steel pipe main body is axially provided with a through seam, and the seam is formed by welding after cutting; the ceramic lining layers are coaxially arranged in the steel pipe body, and each ceramic lining layer is of a cylindrical structure formed by splicing a plurality of ceramic pieces through a daub layer in an adhesive mode; the flat steel is welded to the outer pipe wall of the steel pipe body and covers the joint in the axial direction; and the hoop is arranged between the two steel pipe main bodies, and the hoop is welded to the outer pipe walls of the two steel pipe main bodies correspondingly. According to the invention, the impact resistance and thermal shock resistance of the ceramic lining are obviously improved through the design of the prestressed structure, and the problem that a traditional ceramic layer is easy to crack and peel off is effectively solved; and meanwhile, field direct fusion welding connection of the composite pipe is achieved, tedious flange installation is replaced, and the construction efficiency and the connection reliability are greatly improved.

The present invention relates to a basalt fiber anchor rod double grouting bag prestressed structure and a construction method thereof. By setting up a steel casing connector and a filling layer, the shear resistance of the basalt fiber anchor rod is effectively improved, so that it can adapt to the needs of pre-tensioning construction, thereby broadening the application range of the basalt fiber anchor rod in slope anchoring projects. The setting of the double grouting bag (a first grouting bag component and a second grouting bag component) makes the grouting process more accurate and efficient. By dividing the bottom hole grouting section, the free section and the end grouting section, the segmented control of the grouting process is realized, which effectively prevents the leakage of slurry and ensures the grouting effect. This method greatly simplifies the construction process and improves the construction efficiency. At the same time, the pre-tensioned deformation composite structure effectively solves the problems of basalt fiber anchor rods being susceptible to shear damage, low pre-tensioning force value, insufficient durability, and easy relaxation of prestress during pre-tensioning, providing a new solution for slope prestressed anchoring projects.

The application provides a fan tower structure optimization method based on finite element analysis, and belongs to the technical field of structure optimization; steps include: step 1: obtaining the design requirements of the target fan tower, and establishing a three-dimensional finite element model of the target fan tower; step 2: performing linear stress analysis on the three-dimensional finite element model by using a finite element software, and identifying the area prone to fatigue; step 3: adjusting the prestressed structure parameters of the three-dimensional finite element model, and iteratively optimizing until the area prone to fatigue reaches the fatigue resistance and safety targets, and generating a first model; step 4: using a fatigue analysis method, predicting the performance of the first model during a preset service life to obtain a prediction result; and step 5: according to the prediction result, performing counter-optimization on the first model, adjusting the model parameters of the first model to generate an optimal model. The tower structure is optimized, the tower strength is improved, and the cost is reduced.

The embodiment of the present application provides a prestressed structure of an upper turntable of a rotating bridge, comprising an upper turntable, at least one row of longitudinal post-tensioned prestressed tendons and at least one row of transverse post-tensioned prestressed tendons; the at least one row of longitudinal post-tensioned prestressed tendons is anchored on the top of the upper turntable, and all of the longitudinal post-tensioned prestressed tendons in each row are spaced apart along the transverse direction of the upper turntable and extend along the longitudinal direction of the upper turntable; the at least one row of transverse post-tensioned prestressed tendons is anchored in the upper turntable, and all of the transverse post-tensioned prestressed tendons in each row are spaced apart along the longitudinal direction of the upper turntable and present a curve shape with a high middle and low ends along the transverse direction of the upper turntable. The prestressed structure of the upper turntable of the embodiment of the present application is relatively economical while meeting the structural force requirements.

The invention relates to the technical field of prestressed concrete, and discloses a U-shaped prestressed concrete sheet pile anti-scouring wall structure which comprises a prefabricated sheet pile, a protruding block is arranged on the outer wall of the prefabricated sheet pile, a square groove is formed in the outer wall of the prefabricated sheet pile, a circular groove is formed in the inner wall of the protruding block, an inserting rod is connected to the inner wall of the square groove in a sleeved mode, and a U-shaped groove is formed in the outer wall of the inserting rod. The U-shaped prestressed concrete sheet pile anti-scouring wall structure comprises a prefabricated sheet pile, a butt joint groove is formed in the inner wall of the prefabricated sheet pile, a screw hole is formed in the inner wall of the prefabricated sheet pile, a triangular supporting frame is in lap joint with the inner wall of the prefabricated sheet pile, and a triangular filling groove is formed in the inner wall of the triangular supporting frame. By arranging the prefabricated plate piles, the triangular supporting frames, the metal plates, the metal blocks and other structures, connectivity and triangular supporting prestress are also generated between the two prefabricated plate piles, then the inner sides and the outer sides of the prefabricated plate piles are in linkage at the same time, the triangular prestress structure is added, and the prestress effect is added to the inner side and the outer side of the device.

The invention discloses an active supporting structure for a shallow-buried tunnel portal pipe shed, relates to the field of tunnels, and aims to improve the rigidity and stability of the supporting structure through active stress of the pipe shed. According to the technical scheme, the active supporting structure for the shallow-buried tunnel portal pipe shed comprises a guide wall at the portal, a supporting pipe is inserted into the guide wall, the front end of the supporting pipe is inserted into a soil body on the inner side of the guide wall, and the rear end of the supporting pipe is located on the outer side of the guide wall; at least one connecting hole is formed between the earth surface above the supporting pipe and the supporting pipe, an anchoring plate is arranged at the opening position of the connecting hole, a tie bar is arranged in the connecting hole, the upper end of the tie bar is connected to the anchoring plate, and the lower end of the tie bar is connected with the supporting pipe. The tie bars apply upward force to the supporting pipes before the tunnel portal is excavated, namely, the tie bars are of a prestressed structure and can offset part of soil mass load, deformation and sedimentation of the soil mass after the tunnel portal is excavated are reduced, and the risk that a primary support occupies a permanent structural plane is reduced.

The invention discloses an unloading method suitable for locally dismantling a prestressed structure. The method comprises the following steps: determining the arrangement position of a steel support system through structural simulation calculation, constructing a temporary support stress system by using a steel pipe column, a steel beam and a hydraulic jack, reasonably connecting and reinforcing, and installing a monitoring dial indicator; mounting and debugging a support system, and putting into use after ensuring no abnormity through a load test; then, pre-stress grading symmetric unloading is conducted, 20% of pre-stress is unloaded in five grades, structural deformation and supporting stress are monitored in real time, and the structure is dismantled synchronously; after dismantling is completed, permanent structure newly-built reinforcement construction is conducted; and after the strength of the newly-built reinforced structure reaches the standard, the jack hydraulic device unloads step by step, the beam bottom deformation quantity is observed through the dial indicator, finally, the temporary steel supporting system is dismantled, and conversion from a stress system to a permanent structure is achieved. The method fully utilizes and retains the bearing capacity of the structure, exerts the advantages of the steel member, realizes construction controllability and safety monitoring, reduces the manufacturing cost, and shortens the construction period.

The invention relates to the field of steel strand protection, and particularly discloses a prestressed structural steel strand for a wind tower and a preparation process of the prestressed structural steel strand. The preparation technology of the prestressed structural steel strand for the wind tower comprises the steps that S1, oil coating is conducted, specifically, a composite lubricant and base oil with the weight ratio being (1.5-2): 100 are mixed to obtain coating oil, then a steel strand body is coated with the coating oil, and an oil-coated body with the coating amount being 15-30 g / m is obtained; s2, extruding a sheath, wherein the sheath is prepared from the following raw materials in parts by weight: 65-70 parts of common polyethylene; 20 to 35 parts of high density polyethylene; 5-10 parts of a toughening agent; 2-3 parts of a lubricant; 0.5 to 0.6 part of a flame retardant-light stabilizer; and 0.25 to 0.35 part of an ultraviolet absorption-light stabilizer. The prestressed structural steel strand has the advantages of low grease coating amount, high sheath flatness and excellent protection capability, light-oxygen aging resistance and corrosion resistance are both at a high level, and the prestressed structural steel strand has high practicability and durability.

The utility model relates to a clamping type anchorage device suitable for CFRP stranded wires or rib materials, and belongs to the technical field of bridge engineering, and the clamping type anchorage device comprises a steel sleeve, a clamping piece, an aluminum sleeve and a bolt. Wherein the steel sleeve is an inner conical cylinder with an invariable outer diameter and a reduced inner diameter; one end of each clamping piece is separated, and the other end of each clamping piece is complete; one end of the aluminum sleeve is separated, and the other end of the aluminum sleeve is complete; the bolt is in threaded connection with the outer side of the steel sleeve. The inner surface of the steel sleeve, the clamping pieces and the inner and outer surfaces of the aluminum sleeve are specially treated. Compared with a common clamping type anchorage device, the anchorage device has the advantages that the pressure stress on the surface of the CFRP stranded wire or rib material is reduced, the friction force between the stranded wire or rib material and the aluminum sleeve is increased, and larger drawing force is provided; the anchorage device is convenient to install and can be used for cables or prestressed structures.

The application relates to the wind power technology field and discloses a lattice tower and a wind power generation device. The lattice tower comprises a plurality of pile bodies and a plurality of web members. The plurality of pile bodies are arranged around a preset direction, one end of the plurality of pile bodies is connected to a base, and the other end of the plurality of pile bodies is arranged away from the base. The pile body comprises a plurality of sub-piles which are sequentially spliced together, the sub-pile comprises a hollow pipe body, a concrete structure which is located in the pipe body and attached to the inner wall of the pipe body, and the pile body further comprises a prestressed structure which sequentially penetrates through the plurality of sub-piles. Each web member is connected between two adjacent pile bodies. The lattice tower and the wind power generation device provided by the application can be beneficial to saving production costs and improving production efficiency.

The invention discloses an effective prestress calibration method and monitoring device for a high-speed rail continuous beam bridge, and belongs to the technical field of civil engineering structure health monitoring. The method aims to solve the problem that long-term and real-time monitoring cannot be carried out on the effective prestress of the prestressed structure in the service period in the prior art. According to the method, through dual calibration combining finite element analysis and field tensioning, a high-precision conversion relation from working anchor strain to effective prestress is established, and real-time calculation is carried out through the relation in the service period. The monitoring device comprises a sensing unit and a data processing unit. According to the invention, full-period, real-time and accurate monitoring of the effective pre-stress state is realized.

The invention relates to the technical field of aqueduct construction, and discloses an aqueduct U-shaped groove body cast-in-place construction method based on a self-propelled groove building machine and the self-propelled groove building machine. The technical problems that in the prior art, when a conventional bridge moving formwork is used for construction of a large-span U-shaped thin-shell aqueduct, the structural adaptability is poor, the construction stability is insufficient, precision control is difficult under the complex working condition, and the construction organization for connection with a landing section is low in efficiency are solved. The method comprises the following steps: S1, equipment assembly and anti-overturning reinforcement; s2, pre-pressing and positioning a template structure; s3, steel bars and a prestressed structure are installed; s4, an internal mold anti-floating structure is in place; s5, concrete pouring and curing; s6, prestress tensioning and grouting are conducted; s7, equipment demolding and longitudinal movement hole passing are carried out; and S8, mold closing and circulating construction are conducted. According to the self-propelled aqueduct building machine, the lower hanging beam capable of being transversely opened and closed and the foldable hydraulic inner mold structure are arranged, so that the mold plate can accurately adapt to the complex hyperboloid contour and the ultra-large width of a U-shaped aqueduct, and the structure adaptation problem of a common scale frame is solved.

The utility model discloses a prestressed anchorage device of steel strand and prestressed concrete structure, relate to prestressed structure technical field, the prestressed anchorage device of steel strand includes anchorage device, adjusting sleeve, anchor backing plate and U-shaped frame, be equipped with the anchor eye that the steel strand passes through in the anchorage device, the anchor eye is movably inserted with the clamp, and the U-shaped frame is equipped with the anchor backing plate. The clamp is provided with a clamping hole for the steel strand to penetrate through, the clamping hole is communicated with the anchor hole, and the clamp can clamp the steel strand penetrating through the clamping hole. The adjusting sleeve is arranged outside the anchorage device in a sleeving mode and can move relative to the anchorage device. A through hole for the steel strand to penetrate through is formed in the anchor backing plate, and the adjusting sleeve abuts against the anchor backing plate; the U-shaped frame is arranged outside the anchorage device and the adjusting sleeve in a covering mode, the end of the U-shaped frame abuts against the anchor bearing plate, a through hole allowing the steel strand to penetrate through is formed in the U-shaped frame, and an abutting table used for abutting against an external jack is formed on the side, away from the anchorage device, of the U-shaped frame. The tensioning and releasing operation of the steel strand is simple, and the releasing process is slow, so that the damage to the component in the releasing process is avoided.

A pre-stressed structure and a method for forming a pre-stressed structure are provided. The pre-stressed structure comprises a panel including a first region pre-stressed into a condition of membrane tension, resulting in the panel having increased transverse stiffness. The pre-stressed structure may further comprise a second region pre-stressed into a condition of membrane compression. The panel may be a plate or a shell and may form part of an insulating glass unit, which in turn may form part of a curtainwall unit.

The utility model provides a steel box girder and steel truss combined large-span prestress structure which comprises a steel truss unit and a steel box girder unit. Each steel truss unit comprises an upper chord member and a lower chord member which are arranged in parallel, and a plurality of straight web members and diagonal web members are arranged between the upper chord member and the lower chord member; the two steel box girder units are located at the two ends of the steel truss unit correspondingly. Each steel box girder unit comprises an upper flange plate, a lower flange plate and two webs. Wherein the lower chord member extends into the steel box girder unit and is in lap joint with the lower flange plate, and the lap joint length of the lower chord member on the lower flange plate is not smaller than the height of the lower chord member; the upper flange plate is located between the upper chord member and the lower chord member, and the upper flange plate is welded with the straight web members and the diagonal web members; the two webs are located on the two sides of the steel truss unit. The steel box girder and steel truss combined large-span prestressed structure can well meet the building requirements, span a large space at the same time, and generate a perfect building effect.

The utility model provides a releasing and unloading device of a cantilever beam prestressed structure, which belongs to the technical field of bridge construction and comprises an unloading block, the unloading block consists of an upper support, a lower support, a left support and a right support, a first through hole is horizontally formed in the middle of the left support, a second through hole is horizontally formed in the middle of the right support, and the releasing and unloading device further comprises a steel strand. The steel strand penetrates through the first through hole and the second through hole in a sliding mode, and the tension releasing and unloading device of the cantilever beam prestress structure solves the problems that in construction of an existing bridge cantilever beam, a supporting and fixing device for the cantilever beam is lacked, and potential safety hazards of instability exist in the construction process of workers.