高强预应力混凝土管桩液压法施工.doc

高强预应力混凝土管桩液压法施工

    上世纪90年代以来，在上海、江苏沿海滩涂和软土地区，高强度预应力混凝土管桩已被推广应用于房屋建筑和桥梁、码头等工程中。软土地基广泛采用预制桩基础，用柴油锤击入桩时噪声大且拌有浓烟油污，尤其在市区和居民区旁的施工中，有悖于环境和文明施工要求。以液压法压入式施工桩工艺替代锤击，既无噪声也对环境无任何污染，具有广泛的应用前景。本文以上海浦东国际机场二期工程北灯光站、昆山淀山湖大自然国际俱乐部工程的桩基工程为例，介绍高强度预应力混凝土管桩的施工方法、设计、施工中应注意的事项及适用条件以及桩的质量控制。
    一、工程概况
　　上海浦东国际机场二期工程北灯光站工程框架结构1层，高度6．6m。位于上海市浦东机场海滨地带，地质状况：地面以下2．5-3.5m为机械吹填海砂层，地表平坦，砂层往下为淤泥层，属冲刷和淤泥环境沉积类型。第四纪软土厚度较大，特别是第二层的淤泥层，厚度达7．5-11．2m，层面为极具特色的滨海
Prestressed concrete pipe hydraulic construction method

    Since the 90s of last century, in Shanghai, Jiangsu coastal beach and the soft soil areas, high-strength prestressed concrete has been applied to housing construction and bridges, piers and other projects. Soft extensive use of prefabricated pile foundation, diesel pile hammer into the mix when the noise is large and there is smoke oil, especially in urban areas and residential areas adjacent to the construction, contrary to the environmental and construction requirements of civilization. Press-in method to the construction of hydraulic pile hammer replacement process, neither noise, no pollution on the environment also has broad application prospects. In this paper, the second phase of Shanghai Pudong International Airport, North Light Station, Kunshan International Club Dianshan nature works foundations as an example, high strength prestressed concrete pipe construction method, design, construction and application precautions conditions and the pile of quality control.
    First, project survey
Shanghai Pudong International Airport Phase II North Light Station in frame 1, layer height 6.6m. Shanghai Pudong airport is located in coastal areas, geological conditions: 2.5-3.5m below the surface for mechanical blowing sand reclamation, surface flat, sand down the mud layer, is a type of erosion and silt deposition environment. Quaternary thick soft soil, especially in the second layer of mud layer thickness of 7.5-11.2m, for the very unique aspects of coastal