8 results about "Prestressed structure" patented technology

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.

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 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 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.

This invention discloses a tie-beam actively controlled variable cross-section double-row pile support structure and construction method suitable for backfill slopes. The structure includes a front row of piles, a rear row of piles, and at least two tie beams connecting the front and rear rows of piles. Both the front and rear rows of piles are arranged at intervals along the slope direction. This invention achieves a fundamental shift from traditional passive to active force-bearing in double-row pile support structures by employing prestressed tension beams. Traditional support structures only passively resist lateral pressure after slope deformation, while this invention actively applies prestress to the front and rear rows of piles by pre-tensioning the prestressed tendons within the tie beams, adjusting the structural stress state in advance and effectively suppressing lateral slope deformation and backfill settlement. Compared to anchor cables, tie beams, as rigid connection components, have stronger load-bearing capacity and superior deformation resistance, significantly reducing the risk of backfill settlement and ensuring long-term stability of the support structure, fully meeting the safety requirements for permanent support of backfill slopes.

The present application relates to prestressed concrete cylinder pipe technical field, disclose a kind of PCCP pipe structure and production method, including from inside to outside concrete inner layer, steel cylinder body, first mortar protective layer, concrete outer layer, second mortar protective layer and coating;First prestressed structure, including a plurality of first prestressed members, a plurality of the first prestressed members are arranged on the concrete outer layer along the axial direction, and located in the second mortar protective layer;Second prestressed structure, including a plurality of second prestressed members, a plurality of the second prestressed members are distributed on the steel cylinder body along the axial direction, and extend into the concrete inner layer;The first prestressed member and the second prestressed member cooperatively form the prestressed force of the steel cylinder body. The present application solves the problem that the overall stress distribution of the pipe body is greatly affected by the broken wire under the overall arrangement of the prestressed steel wire, and the pipe body is prone to cracks due to excessive prestress during winding.

This utility model belongs to the field of membrane structure construction technology, specifically relating to a highly efficient wind-resistant prestressed membrane structure. It includes a connecting structure, fixed membrane supports, sliding membrane supports, and a main membrane. The fixed and sliding membrane supports are respectively connected to a connecting structure. A double-hole slide rail is fixedly connected above the fixed membrane support. Two parallel sliding square tubes are variably connected above the sliding membrane support, and a single-hole slide rail is fixedly connected above each sliding square tube. The fixed and sliding membrane supports are alternately arranged, with a main membrane positioned between adjacent fixed and sliding membrane supports. The main membrane includes a main membrane fabric and side ropes connected to both sides of the main membrane fabric. One side rope of the main membrane fabric is connected to a first slide rail of the double-hole slide rail, and the other side rope is connected to a second slide rail of the single-hole slide rail. This utility model improves the wind resistance of the structure by employing prestressed technology.

This invention relates to the field of civil engineering structural monitoring technology, and particularly to a microwave detection method and system for prestress loss in loosely bonded prestressed concrete structures. The method includes: acquiring initial prestress data of the steel strands; transmitting a 24GHz microwave signal to the steel strands and receiving the scattered microwave signal; constructing a three-dimensional scattering field model of the steel strands, extracting multi-scale features of the scattered signal, and obtaining multi-dimensional Doppler phase shifts; based on the Doppler phase shifts and combined with environmental parameters, establishing a multi-parameter coupled structural prestress mapping model, and calculating the structural prestress variation value; calculating the structural prestress loss in the unbonded section, anchored section, and bonded section according to the structural prestress variation value, obtaining the overall structural prestress loss distribution; and evaluating and providing early warning of the structural prestress state. This invention achieves non-destructive, high-precision monitoring of structural prestress loss, improving the safety of prestressed structures.