Self-compacting concrete prefabricated hollow plate girder with hybrid fibres instead of reinforcing steel bars and manufacturing method

Abstract

The invention relates to a self-compacting concrete prefabricated hollow plate girder with hybrid fibres instead of reinforcing steel bars and a manufacturing method. The reinforcing steel bars comprise pre-stressed reinforcing steel bars, ribbed steel bars and plain round reinforcing steel bars; the pre-stressed reinforcing steel bars comprise pre-stressed tensile reinforcing steel bars; the ribbed steel bars comprise ribbed longitudinal tensile reinforcing steel bars, ribbed longitudinal compressive reinforcing steel bars, ribbed web plate longitudinal force bearing reinforcing steel bars, and ribbed anti-shear stirrups; the plain round reinforcing steel bars comprise top erecting reinforcing steel bars for fixing the stirrups; the concrete is high-performance self-compacting concrete with the compressive strength of not greater than 50 MPa; the fibres are reinforcing and toughening crude fibres which are mixed in the self-compacting concrete, and comprise end part bending hook-type steel fibres, steel wire-simulated synthetic crude fibres or basalt fibres; the lengths of the fibres are not smaller than 3 cm, and the diameters are not smaller than 0.4 cm. The self-compacting concrete prefabricated hollow plate girder with the hybrid fibres instead of the reinforcing steel bars has the advantages that the concrete shrinkage is small; cracks are reduced; the bonding stress of the concrete and the reinforcing steel bars is high; honeycombs, pitted surfaces and cavities are avoided; the distance between the stirrups is increased; the reinforcing steel bar arrangement precision is improved; the component durability is improved.

Description

technical field [0001] The invention relates to a concrete bridge, in particular to a self-compacting concrete prefabricated hollow slab girder in which hybrid fibers replace steel bars and a manufacturing method thereof. Background technique [0002] At present, the construction of small and medium-span highway bridges accounts for 98% of the total number of highway bridges. Highway bridges with small and medium spans can use assembled pretensioned prestressed concrete simply supported hollow slab girders as the main load-bearing members, and the maximum span of the hollow slab girders should not exceed 20 meters. [0003] However, prefabricated prestressed concrete hollow slab beams may cause surface cracks due to concrete shrinkage; longitudinal cracks at the bottom of the beam are prone to appear when adding accelerators such as chloride salt; The force zone makes it easy to generate horizontal cracks at the beam end, or small horizontal cracks near the anchor head due ...

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Problems solved by technology

Therefore, the high-performance self-compacting concrete prefabricated hollow slab

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