At present, most small and medium span highway bridges or urban bridges at home and abroad are prestressed concrete bridges. Prestressed concrete can lower the height of the bridge and has great spanning capacity. The rapid development of prestressed concrete technology has provided effective means of joint and assembling for modern prefabricated structure, leading to a great leap in bridge technology and operation quality. Based on the method of post-tensioned construction, this article expounds the tensile process of the prefabricated concrete box girder.%目前国内外中小跨径的公路桥梁或城市桥梁，大部分是预应力混凝土桥，它兼有降低桥高和跨越能力大的优点。随着预应力混凝土技术的快速发展，更为现代装配式结构提供了有效的接头和拼装手段，使建桥技术和运营质量均产生了较大的飞跃。本文结合后张法施工，针对混凝土预制箱梁的张拉工艺做以具体阐述。
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