
2017年4月下第46卷第8期
D0I:10.7672/sgjs2017080113
施工技术
CONSTRUCTION TECHNOLOGY
超高索塔泵送混凝土技术
吴明威,刘冬冬,李耀宗,周
里
(中交二航局第五工程分公司,湖北武汉
430012)
【摘要】赤石大桥主桥为4塔双索面预应力混凝土斜拉桥,主塔为双面双曲线收腰结构,其中7号主塔为4塔中最高索塔。主塔混凝土施工采用泵送混凝土工艺,票送高度已达到现代超高泵送混凝土技术的要求,具有浇筑总量大,单次浇筑量大的特点,且受塔身结构限制,泵送混凝土泵管更换较为围难,对混凝土泵送技术提出了较高要求。本文结合工程实例总结高程泵送的方法。
[关键词]混凝土;索塔;票送;试验;施工技术
【中图分类号]TU755.5
【文献标识码】A
[文章编号】1002-8498(2017)08-0113-04
PumpingConcreteTechnologyofUltraHighCableTower
WU Mingwei,LIU Dongdong,LIYaozong,ZHOU Lei
(China Communications 2nd Navigational Bureau 5th Engineering Co., Lad., Wuhan, Hubei 430012, China)
Abstract: Chishi bridge is a cable-stayed bridge with four towers and double cable plane prestressed concrete, the main tower is the double hyperbolic waist structure, the No. 7 main tower is the highest. Concrete construction of main tower by pumping concrete technology, the pumping has reached the height of modern super high pumping concrete technology requirements, with a large amount of single pouring, pouring a large amount of features, and because of the tower structure limit, the concrete pumping replacement is difficult, concrete pumping technology puts forward higher requirements combined with the
engineering example, the method of vertical pumping is summarized. Key words:concrete; cable tower; pumping; testing; construction
1
工程概况
赤石大桥主体结构为165m+3×380m+165m 4塔预应力混凝土双索面斜拉桥,边塔支承、中塔塔梁墩固结体系,主桥各塔均布置23对斜拉索,斜拉索纵向呈扇形布置。斜拉桥主桥桥形结构如图1 所示。
16500
38 000
38 000
38 000
图1主桥桥形结构布置
Fig.1 The bridge shaped structure layout
16500
主7号墩索塔由上塔柱、中塔柱、下塔柱、塔座、 A-D横梁、塔冠等组成。承台以上塔高为286.63m。其中塔座高6m,索塔下塔柱高111.73m,索塔中塔
【作者简介】吴明威,高级工程师,E-mail;573013979@qq-com
[收稿日期】2017-01-04 万方数据
113
柱高60m,上塔柱高103.9m。上半部分为斜拉索锚固区,采用钢锚梁结构,并在塔壁混凝土中张拉U 形预应力束。索塔结构如图2所示。
4:
a平面
b三维图
2主7号索塔图2
Fig.2The No.7main tower