水运工程
水運工程
수운공정
Port & Waterway Engineering
2015年
8期
139-143
,共5页
超大断面%预制沉管%现浇结构%人工岛%温度裂缝%控制技术%补偿收缩
超大斷麵%預製沉管%現澆結構%人工島%溫度裂縫%控製技術%補償收縮
초대단면%예제침관%현요결구%인공도%온도렬봉%공제기술%보상수축
super-large section%precast immersed tube%cast-in-situ tunnel%artificial island%thermal crack%control technology%compensating contraction
港珠澳大桥岛隧工程超大断面隧道混凝土包括预制沉管混凝土和人工岛现浇隧道混凝土，具有强度高、结构尺寸大、服役环境恶劣、控裂要求高且难度大等特点。其中预制沉管采用工厂法预制，全断面浇筑，采取片冰和制冷水拌合混凝土、喷雾养护等温控措施；人工岛隧道混凝土现场浇筑，采取合理分段分层、冷却水管、补偿收缩混凝土等温控措施。从施工现场情况来看，均未出现有害温度裂缝，温控效果良好，达到了预期的温控目标。
港珠澳大橋島隧工程超大斷麵隧道混凝土包括預製沉管混凝土和人工島現澆隧道混凝土，具有彊度高、結構呎吋大、服役環境噁劣、控裂要求高且難度大等特點。其中預製沉管採用工廠法預製，全斷麵澆築，採取片冰和製冷水拌閤混凝土、噴霧養護等溫控措施；人工島隧道混凝土現場澆築，採取閤理分段分層、冷卻水管、補償收縮混凝土等溫控措施。從施工現場情況來看，均未齣現有害溫度裂縫，溫控效果良好，達到瞭預期的溫控目標。
항주오대교도수공정초대단면수도혼응토포괄예제침관혼응토화인공도현요수도혼응토，구유강도고、결구척촌대、복역배경악렬、공렬요구고차난도대등특점。기중예제침관채용공엄법예제，전단면요축，채취편빙화제랭수반합혼응토、분무양호등온공조시；인공도수도혼응토현장요축，채취합리분단분층、냉각수관、보상수축혼응토등온공조시。종시공현장정황래간，균미출현유해온도렬봉，온공효과량호，체도료예기적온공목표。
As the high concrete strength,large size andsevere service environment for super-large section tunnel which includes the precast immersed tube and the cast-in-suit tunnel in the artificial island of Hong Kong-Zhuhai-Macao bridge,crack control of concrete is difficult.Harmful cracks can be controlled effectively by a series of treatment measures during the construction period such as precasting in the factory,one-piece casting,controlling concrete raw material temperature,mixing concrete with ice shavings and cooling water,setting up automatic curing system for the precast immersed tube and reasonable layered and segmented,water pipe cooling,compensating contraction concrete for the cast-in-situ tunnel.Moreover,the harmful crack does not appear in both the precast immersed tube and the cast-in-situ tunnel appear and the prospective objective of temperature control is achieved.
