沉井施工方案.doc

沉井是在地面或地坑上，先制作開口鋼筋混凝土筒身，達到一定強度后，在井筒內分層挖土、運土，隨著井內土面逐漸降低，沉井筒身借其自重克服與土壁之間的摩阻力，不斷下沉而就位的一種深基或地下工程施工工藝。
沉井結構和沉井施工的特點是：沉井結構截面尺寸和剛度大，承載力高，抗滲、耐久性好，內部空間可資利用，可用于很大深度地下工程的施工，深度可達50m；施工不需復雜的機具設備，在排水和不排水情況下均能施工；可用于各種復雜地形、地質和場地狹窄條件下施工，對鄰近建筑物、構筑物影響較小；當沉井尺寸較大，在制作和下沉時，均能使用機械化施工；比大開挖施工，可大大減少挖、運、回填土方量河加快施工速度，降低施工費用。本工藝標準適用于工業與民用建筑的深坑、地下室、水泵房、設備深基礎、橋墩、碼頭等沉井工程。
一、材料要求
1．水泥
用425號或525號普通硅酸鹽水泥或礦渣硅酸鹽水泥，新鮮無結塊。
2．砂
粗砂或中砂，含泥量不大于
Sunk in the ground or pit, the first production opening reinforced concrete Flashlight, after a certain intensity, in the well bore stratified excavation, earth, soil surface decreased with the wells, caisson Flashlight overcome by its weight wall friction between the soil, constantly sinking in place of a deep underground base, or construction technology.
Caisson caisson construction of the structure and characteristics: caisson structure dimensions, and rigidity, high bearing capacity, permeability, durability, interior space available and can be used for very deep underground works, the depth of up to 50m; construction does not require complicated machinery equipment, in the case of water and can not drain construction; can be used for a variety of complex topography, geology, and the narrow space under construction, on adjacent buildings and structures less affected; when the caisson size greater production and sink, can use the mechanical construction; than large excavation can greatly reduce the digging, transport, backfill earthwork River speeding up, reducing construction costs. This technology is applicable to industrial and civil construction pit, basement, pump house, equipment, deep foundation, piers, docks and other open caisson construction.
1, material requirements
1. Cement
425 or 525 with Portland cement or slag cement, fresh non-caking.
2. Sand
Coarse sand or in sand, mud content is not more than
 

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