30results about How to "Increase cracking load" patented technology

The invention relates to a post-tensioned prestressed concrete composite beam and a construction method thereof. The composite beam is a kind of post-tensioned non-post-tensioned beam applied to the entire beam after the composite beam is laminated and formed to meet the requirements of use. Bonded prestress. Compared with the traditional composite beam, it adopts post-tensioned bonded prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also improves the crack resistance and bending resistance of the components. Because post-tensioned prestress can be applied after the overall construction and the post-tensioned unbonded prestressed tendons have good anti-corrosion performance, it is especially suitable for large-span and heavy-duty structures that require high deformation control, bearing capacity and weather resistance. In the structure with high performance requirements such as loading, it can also reflect the superiority of the assembled structure while meeting the design requirements.

The invention relates to a co-tensioned prestressed concrete composite beam with post-tensioning and bonding and its design and construction method. A new type of prestressed composite beam with bonded and bonded prestress applied by pre-tensioning and post-tensioning processes. Compared with the traditional prestressed composite beam, it adopts post-tensioned bonded prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also has its unique advantages, which can improve the crack resistance of components Bending performance, stretching in batches to meet the structural needs of different periods, and can cooperate with the design of assembled integral prestressed node connections to enhance the integrity and seismic performance of the structure, especially suitable for large spans with high requirements for deformation control and bearing capacity In structures with high performance requirements such as heavy loads and heavy loads, it can also reflect the superiority of assembled structures while meeting the design requirements.

The invention discloses a pressure bearing pipe damage repair process. The process is performed by the following steps: a carbon fiber fabric (4), a repair agent, adhesive, a torque spanner (15) and a tensioning device (1) are prepared; the damage positioning is performed for a pressure bearing pipe (5), and an obstacle is removed; a foreign matter at a damage part is removed, and an area to be repaired is determined; after the repair agent is coated on the area to be repaired, the adhesive is coated; the carbon fiber fabric (4) is bonded on the adhesive, and the left and right ends of the carbon fiber fabric (4) are tightened by the tensioning device (1); the torque spanner (15) is clamped on a shaft head (10), and is wrenched to enable a finger of a dial (16) to reach preset torsion; all locking screws (3) are tightened, and the prestress of the carbon fiber fabric (4) is constant; the adhesive is uniformly coated on the surface of the carbon fiber fabric (4); and after the adhesive reaches the stated condensation period, the tensioning device (1) is disassembled to finish one-time repair process.

The invention relates to a prestressed concrete composite beam with post-tensioning and slow bonding and its design and construction method. The top of the composite beam is provided with a layer of top longitudinal reinforcement, and the bottom is provided with a layer of bottom longitudinal reinforcement; it also has several stirrups A number of post-tensioned slow bonded prestressed tendons are also arranged at the lower part of the composite beam, and the two ends of the composite beam protrude out of the composite beam and are respectively fixed with anchors and clamps. The composite beam adopts post-tensioning slow bonded prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also improves the crack resistance and bending resistance of the components. Because post-tensioning prestressing can be applied after the overall construction and post-tensioning slow bonded prestressing tendons have good anti-corrosion properties, it is especially suitable for large-span and heavy-duty structures that require high deformation control, bearing capacity and weather resistance. In the structure with high performance requirements such as loading, it can also reflect the superiority of the assembled structure while meeting the design requirements.

The invention discloses a CDQ coke tank and a production method thereof. A CDQ coke tank comprises a coke tank body, the coke tank body includes a tank body, a refractory fiber felt and a grid; the tank body consists of The liner is formed by masonry and splicing of prefabricated blocks; the refractory fiber felt is arranged on the outer surface of the tank body; the grid is wrapped on the outer surface of the refractory fiber felt in a stretched state. By stretching the grid, the coke tank is prestressed, so that the stress is evenly transmitted to the refractory working layer, which offsets the tensile stress generated by the side wall of the coke coke tank, avoids the defect that the inner lining is easy to crack and peel off, and can effectively improve the coke. The service life of the tank.

The invention relates to a post-tensioned unbonded co-tensioned prestressed concrete composite beam and its design and construction method. A new type of prestressed composite beam with bonded and unbonded prestress applied by pretensioning and posttensioning process. Compared with the traditional prestressed composite beam, it adopts post-tensioned unbonded prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also has its unique advantages, which can improve the crack resistance of components Bending performance, stretching in batches to meet the structural needs of different periods, and can cooperate with the design of assembled integral prestressed node connections to enhance the integrity and seismic performance of the structure, especially suitable for large spans with high requirements for deformation control and bearing capacity In the structure with high performance requirements such as heavy load and heavy load, it can also reflect the superiority of the assembled structure while meeting the design requirements.

The invention relates to a crude polypropylene-basalt hybrid fiber prefabricated dry hard fiber concrete, a pipe jacking, and a manufacturing method, comprising: containing basalt fiber and crude polypropylene fiber in the concrete, wherein the mass ratio of crude polypropylene to basalt is 1 :1~4:1; more preferably, each cubic meter of concrete contains: cement 375kg, sand 850kg, coarse aggregate 545kg, fine aggregate 545kg, coarse polypropylene 4kg, basalt fiber 2kg, water reducer 3.75kg. By adopting the crude polypropylene-basalt hybrid fiber prefabricated dry hard fiber concrete, pipe jacking, and manufacturing method of the present invention, a high-strength pipe jacking with fewer cracks in use can be obtained, and the problem of low pipe jacking production efficiency can be solved.

The invention discloses a method for compensating the vertical prestress loss of bridges based on embedding prestressed slats on the surface. The steps are as follows: step S1: cutting out prefabricated grooves on the concrete protective layer of the web of the bridge structure; step S2: installing the plates The strip clamp and the tensioning device are fixed to the protective layer of the web at the fixed end and the tensioning end respectively, and the tensioning end strip clamp and the sensor are installed; Step S3: Anchoring and Stretching the slats; step S4: filling the prefabricated groove with adhesive; step S5: completing the stretching; after the adhesive reaches the curing strength, release the prestress applied by the tensioning device, so that the tensioning end and the fixed end clamp occur Sliding, the prestress on the slats is released. The invention has the advantages of good durability, good construction convenience, and can increase web cracking load and shear bearing capacity.

The invention discloses an FRP prestressed reinforcement ballastless track. The FRP prestressed reinforcement ballastless track comprises a plate body extending in the lengthwise direction, a plurality of layers of stress reinforcement meshes are arranged in the thickness direction of the plate body, are horizontally arranged in the plate body, and comprise a plurality of steel-continuous filament composite reinforcements extending in the transverse direction of the plate body and a plurality of high-strength steel bars extending in the lengthwise direction of the plate body, and the steel-continuous filament composite reinforcements and the high-strength steel bars are arranged in an orthogonal manner; and the plate body is further internally provided with a plurality of FRP prestressed reinforcements arranged in the lengthwise direction and the transverse direction, and the FRP prestressed reinforcements are located between the two layers of adjacent stress reinforcement meshes. The invention further discloses a manufacturing method of the FRP prestressed reinforcement ballastless track; the steel-continuous filament composite reinforcements and the traditional high-strength steel bars form the stress reinforcement meshes, and the insulating property of a track plate is improved; the FRP prestressed reinforcements are adopted for increasing cracking loads, and the fatigue durability and the endurance quality of the track plate are improved; and by means of the method, other insulating measures are not needed, and the production cost can be effectively reduced.

The invention relates to a co-tensioned prestressed concrete composite beam with post-tensioning and slow bonding and its design and construction method. A new type of prestressed composite beam with bonded and slow bonded prestressed by pre-tensioning and post-tensioning processes. Compared with the traditional prestressed composite beam, it adopts the post-tensioning slow bonding prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also improves the crack resistance and bending resistance of the components. Because the configuration of its prestressed tendons is relatively more flexible and the post-tensioned slow bonded prestressed tendons have better anti-corrosion properties, it is especially suitable for long-span and heavy-duty applications that require high deformation control, bearing capacity and weather resistance. In the structure with high performance requirements, it can also reflect the superiority of the assembled structure while meeting the design requirements.