In special geographical environment, when there are special requirements for the linear, force, span, and so on, precast beam can't meet these requirements. It is necessary to use support cast-in-place box girder. Cast-in-place box girder has strong torsional ability, large span, strong lateral bending stiffness and good stability. Combined with engineering example, this article introduces support cast-in-place box girder construction technique.%在特殊地理环境中，在线型、受力、跨度等各方面有特殊要求时，由于预制梁满足不了这些，需要使用支架现浇箱梁。现浇箱梁有抗扭能力强，跨度大，横向抗弯刚度大，稳定性好等优点。下面结合工程实例介绍一下支架现浇箱梁施工技术。
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