45results about How to "Improve section stiffness" patented technology

The invention relates to a triangular concrete thin-wall folded plate pile; end-to-end connection is conducted on a concrete left plate, a concrete middle plate and a concrete right plate so as to bend and form a triangular drum shape; the three angles of the triangular drum are respectively provided with a first bottom angle joint-pouring concrete zone, a second bottom angle joint-pouring concrete zone and a top angle joint-pouring concrete zone which cover part of steel bars of a steel bar mesh. A preparation method comprises the following steps: the concrete left plate, the concrete middleplate and the concrete right plate which are flatly horizontal are simultaneously poured and stretched to form a concrete flat plate of which three steel bar meshes are connected; the concrete left plate and the concrete right plate are symmetrically bent to form an angle; when the angle reaches 90 degrees, harsh concrete is adopted to cast the bottom angle joint-pouring concrete zones; the symmetrical bending is conducted continuously so as to lead the concrete left plate, the concrete middle plate and the concrete right plate to form a triangular drum shape; short connecting bars on the toppart are welded, the top angle joint-pouring concrete zones are cast, simultaneously adjustment and repairing are conducted on the bottom angle joint-pouring concrete zones, and when the joint-pouringconcrete reaches design strength, the triangular concrete thin-wall folded plate pile is formed.

A type of steel concrete frame-steel support structure variable cross-section conversion node, which is connected and poured into one by the medium-shaped steel in the column, the medium-shaped steel in the beam, the steel support, the reinforced concrete in the column, and the reinforced concrete in the beam. The section steel and the beam medium-section steel flange plate are connected orthogonally, the web of the beam medium-section steel at the node junction is converted into a web with increased height and variable section, and the upper side of the web with increased height and variable section is welded to the upper flange with increased width and variable section, and the height and variable section The underside of the web plate is welded with the lower flange of the widened and variable section; the shape of the steel support at the junction of the nodes is converted into a structure in the transition zone of the variable section node, and the two flange plates of the steel support in the transition zone of the variable section are respectively connected with the steel in the column and the The beams are connected orthogonally in steel sections. The invention enhances the stress performance of the section steel concrete frame-steel support structure joint area and the synergistic effect ability of the section steel and reinforced concrete.

The invention relates to an anti-shearing reinforcement device and method for a concrete box girder web. In order to solve the problem that in existing engineering technologies, the concrete box girder web has cracking inclined cracks and insufficient anti-shearing bearing capacity, an external vertical prestressing tendon reinforcement device and method are provided. The device comprises groove-shaped steel, L-shaped steel, vertical prestressing tendons, wedge-shaped steel cushion blocks and an anti-corrosion coating at the outer side of the web. The groove-shaped steel is horizontally fixedto the junction of the upper end of the web and a top plate in the girder length direction. The L-shaped steel (6) is horizontally fixed to the lower end of the web in the girder length direction andis parallel to the groove-shaped steel (5). The vertical prestressing tendons are vertically mounted on the groove-shaped steel and the L-shaped steel, and it is ensured that the vertical prestressingtendons are parallel to the plane of the web. According to the anti-shearing reinforcement device and method, the web is connected with the top plate and a bottom plate through finish rolling twistedsteel, the force transmission path is definite, the risk that web concrete is pulled broken is reduced, and meanwhile, midspan deformation is reduced; the problem of insufficient main tensile stressof the web concrete is effectively solved, and the situations of continuous extension of the inclined cracks of the web or new inclined cracks are prevented.

The invention discloses a steel plate holder and skew spike combined rapid connecting steel and UHPC (ultrahigh performance concrete) combination structure system, comprising a steel beam, an UHPC thin slab, steel plate holders and short spikes; the steel plate holders are of isosceles-trapezoid structure, and are connected with the steel beam through high-strength bolts; the short spikes are vertically arranged on bevels of two sides of each steel plate holder; the UHPC thin slab is cast on the upper side of the steel beam; combinations of the steel plate holders and the short spikes are uniformly distributed inside the UHPC thin slab. As the deck slab is made of UHPC, dead weight of the structure can be reduced while bridge capacity of the structure can be improved; steel plate holder and skew spike combined connectors are used for interface connection at the interface, so that comprehensive advantages of the steel plates serving as the rigid connectors and the spikes serving as theflexible connectors can be achieved well, and interface slippage can be reduced under action of rigid connection of the steel plate holders in the normal application state; in the UHPC slab, the shortskew spikes are in staggered arrangement to form the reinforcing truss of the UHPC, and accordingly rigidity of the UHPC slab is increased and the integral rigidity of the combination section is increased.