UHPC steel tube concrete laminated laced column structure and construction method thereof

Abstract

The invention relates to an UHPC steel tube concrete laminated laced column structure. The UHPC steel tube concrete laminated laced column structure comprises column limbs; connecting plates are arranged between the two adjacent column limbs; the column limbs comprise column external-wrapping UHPC layers; combination columns are arranged in the column external-wrapping UHPC layers; the connectingplates comprise UHPC plate layers; lacing tubes are arranged in the UHPC plate layers; and node connecting blocks are arranged between the lacing tubes and the combination columns. The invention further relates to a construction method of the UHPC steel tube concrete laminated laced column structure. The UHPC steel tube concrete laminated laced column structure has the advantages that the structure is reasonable; the operation is simple and convenient; the structural strength, rigidity, durability and corrosion resistance can be enhanced; and meanwhile, the deadweight can also be reduced, andthe resistance to wind and sand can also be improved; and the service life of the structure is prolonged.

Description

technical field [0001] The invention relates to a UHPC steel pipe concrete superimposed lattice column structure and a construction method thereof. Background technique [0002] Ultra-high Performance Concrete (UHPC) is the most durable engineering material. The mechanical properties of properly reinforced UHPC are close to steel structures. At the same time, UHPC has excellent wear resistance and explosion resistance. , after adding a certain amount of fine steel fibers, its ductility can be significantly improved, even up to 250 times the ductility of ordinary concrete, and the ultimate tensile strain can reach 1% of the ultimate compressive strain; UHPC is widely used in various engineering facilities. Wide application prospects, especially long-span bridges, blast-resistant structures (military engineering, bank vaults, etc.) and thin-walled structures; UHPC is generally composed of materials such as cement, silica fume, fine sand, high-efficiency water reducer and steel...

AI Technical Summary

Problems solved by technology

[0005] The concrete-filled steel tube composite lattice column is composed of four column limbs and the tube-filled concrete slabs connected between the column limbs. Its internal skeleton is welded by a number of pipes and joint blocks respectively. The concrete slab with pipes can precisely fix the position of the column limbs. The pipe-attached concrete filled externally is prone to spalling in the place where the stress is greater, and the protection effect on the pipe-attachment is greatly weakened, thereby reducing the bearing capacity and rigidity of the structure

[0006] If the cross-sectional area of ​​the CFST composite lattice column is not changed, but the cross-sectional area of ​​the outer reinforced concrete layer is increased to improve the bearing capacity, stiffness and durability of the CFST composite lattice column, the pier will be enlarged. The space occupied by the column is not conducive to the passage under the bridge, and also increases the difficulty of construction

However, in order to meet the superior performance of concrete-filled steel tube laminated lattice columns, the outer reinforced concrete layer is often designed to be thicker, resulting in the problem of excessive structural volume

[0007] At present, most of the concrete filled in concrete-filled steel tube composite lattice columns is ordinary concrete with heavy weight, low strength, weak stiffness, fragility, and general corrosion resistance. These shortcomings affect and limit the use of concrete-filled steel pipe composite lattice columns in large bridges. In the western region where the wind and sand environment is more serious, the damage to the outer reinforced concrete layer is also more serious, which is not conducive to the normal use of steel pipe concrete laminated lattice columns

Images