The invention discloses a prefabricated steel
pipe-steel web-
prestressed concrete composite
box girder and a construction technology. The prefabricated steel
pipe-steel web-
prestressed concrete composite
box girder is divided into three types. The first type is an I-shaped composite
box girder, and the I-shaped composite box girder includes a steel
pipe, a prefabricated concrete plate, a steel webplate, a lower
flange steel plate, steel plate concrete, prestressed steel bars, a steel cage, shear connecting pieces, high-strength bonding
mortar, connecting pieces, corrugated pipes and anchoragedevices. The second type is a pi-shaped composite box girder, and the pi-shaped composite box girder includes two steel pipes, a prefabricated concrete plate, two steel web plates, two lower
flange steel plates, steel plate concrete, prestressed steel bars, shear connecting pieces, high-strength bonding
mortar, connecting pieces, steel cages and transverse
steel plates. The third type of composite box girder includes two steel pipes, a prefabricated concrete plate, two steel web plates, a lower
flange steel plate, steel plate concrete, prestressed steel bars, shear connecting pieces, high-strength bonding
mortar, connecting pieces, steel cages and transverse
steel plates. According to the prefabricated steel pipe-steel web-
prestressed concrete composite box girder and the construction technology, the
shear capacity of the web plates of the box girder is improved, and the prestressed steel bars are used for improving the
crack resistance, stiffness and durability of the concrete.