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張向東，肖勝利，夏  琪，谷洪勛
(河南省建設(shè)集團(tuán)有限公司，鄭州450002)

[摘要] 體外預(yù)應(yīng)力常用于加固梁、屋架等構(gòu)件。介紹了應(yīng)用體外預(yù)應(yīng)力方法加固化工廠房18m跨屋架下弦桿的設(shè)計(jì)與施工，在體外預(yù)應(yīng)力鋼筋的布置、線型設(shè)計(jì)和轉(zhuǎn)角等方面進(jìn)行了探討。針對(duì)體外預(yù)應(yīng)力筋氣相銹蝕問題采取涂刷環(huán)氧樹脂的方法有效地防止了鋼筋銹蝕。為加快施工進(jìn)度、減少停產(chǎn)損失、避免損壞生產(chǎn)設(shè)備，利用車問內(nèi)的吊車作為加固施工平臺(tái)，既方便操作又能保證安全施工。
[關(guān)鍵詞] 承體外預(yù)應(yīng)力；加固；折線型屋架；化工廠房

Strengthening design and construction of a caustic soda workshop mansard roof with extracorporeal prestressing technology
Zhang Xiangdong, Xiao Shengli, Xia Qi, Gu Hongxun
(He'nan Province Construction Corporation,  Zhengzhou 450002, China)

Abstract: The external prestressing is often used to consolidate components such as girder, roof truss. This text introduced the design and construction of the external prestressing consolidating the chord under the roof truss of 18-meter-high factory building of chemical industry; and discussed the layout of the steel bars of external prestressing, design ofline type and corner. In respect ofthe rusting issue ofthe external corrosion ofprestressing tendons, the method of brushing araldite can effectively prevent the steel bars from rusting. If the crane in the workshop can be changed to the operating platform for consolidating, it would expedite the construction schedule and reduce the loss ofproduction.
Keywords: extracorporealprestressing;  strengthening;  mansard roof;  chemicalindustry