NC-UHPC combined assembly type prestressed concrete box girder, construction method and bridge thereof: Fid-Bau Portal

NC-UHPC combined assembly type prestressed concrete box girder, construction method and bridge thereof

LAI YAPING

The invention discloses an NC-UHPC combined assembly type prestressed concrete box girder which comprises a prefabricated NC top plate (11), a prefabricated NC bottom plate (21) and a prefabricated UHPC variable cross-section straight web plate (31), and the prefabricated UHPC variable cross-section straight web plate (31) is arranged in the mode that the area of the plate faces of the two vertical ends of the web plate is larger than that of the plate face of the middle portion of the web plate; the NC and the UHPC are combined, the advantages of high compressive strength and low price of the NC are fully utilized, the outstanding advantages of high strength, high elastic modulus, high durability, high toughness, high compactness, low creep and the like of the UHPC are fully played, and the NC-UHPC has the advantages of being excellent in structural stress performance, light in weight, high in cost performance, light in construction hoisting weight, capable of reducing support construction, short in construction period and the like.

本发明公开了一种NC‑UHPC组合装配式预应力混凝土箱梁，包括预制NC顶板(11)、预制NC底板(21)和预制UHPC变截面直腹板(31)，所述预制UHPC变截面直腹板(31)为腹板竖向两端板面面积大于中部板面面积设置；通过将NC‑UHPC组合，充分利用NC抗压强度高、价格便宜的优点，充分发挥UHPC高强度、高弹模、高耐久性、高韧性、高密实度、低徐变等突出优点，并且具有结构受力性能优异、重量轻、性价比高、施工吊装重量轻、减少支架施工、施工工期短等优点。

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