钢板桩围堰设计与施工.doc

钢板桩围堰设计与施工

钢板桩围堰设计与施工
    〔提要〕该文叙述了水中承台施工中采用钢板庄围堰进行维护       挡水的设计情况与施工方法以及施工中易出现的问题和解决措施。  
〔关键词〕钢板桩设计  施工方法  控制措施
1、 工程概况
南京市高淳县丹湖撤渡建桥工程小花大桥Q1标位于江苏省高淳县境内，该桥全长605.3米。跨径组合为（4-25）+（3-25+20）+（42+75+42）+（20+4-25）+（5-25）m，其中主桥上部为（42+75+42）m三跨预应力混凝土变截面单箱单室连续箱梁，下部承台几何尺寸为5.4米*5.4米，墩身几何尺寸为4.4米*2.0米。主墩9#、10#位于运粮河中，运粮河属于国家二级河道，不能断航。平时水深保持在3米左右，雨季时水深在6米以上，地质情况自上而下依次为素填土、亚粘土、淤泥质亚粘土、粘土等。地质-4～0.4米为淤泥质亚粘土，正好处于承台下部和桩基顶部。
2、 水中墩施工情况回顾
2004年11月，我单位中标小花大桥Q1标，当时运粮河处于枯水期，水位比较浅，水流速度较小。根据当
Design and construction of steel sheet pile cofferdam

Design and construction of steel sheet pile cofferdam
    〔Abstract〕 The paper describes the construction of platform in the water village with steel retaining cofferdam design conditions for maintenance and construction methods and construction trade problems and the countermeasures.
Key words steel sheet pile design and construction methods to control measures
1, Project Overview
Nanjing Dan Lake Gaochun withdrawal Bridge crossing the bridge flowers marked in Q1 Gaochun County, Jiangsu Province, the bridge length 605.3 meters. Span combination (4-25) + (3-25 +20) + (42 +75 +42) + (20 +4-25) + (5-25) m, where the main superstructure of (42 +75 +42) m three-span prestressed concrete box single tapered single box girder, the lower cap geometry of 5.4 meters by 5.4 meters, the geometric dimensions of Piers 4.4 meters x 2.0 meters. Main Pier 9 #, 10 # in the river and transportation, and transportation river state two channel, can not be unnavigable. Usually kept at 3 meters depth, the rainy season, water depth of 6 meters, the geological situation of the order of elements from top to bottom fill, loam, silt loam, clay. Geological -4 ~ 0.4 m for the silt loam, just in a pile cap and pile top of the Department.
2, water, construction of pier review
November 2004, I won the bid Flower Bridge Q1 unit standard, then and transportation river in the dry season, water more shallow, low water velocity. According to when