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工程概况新澳凼大桥主桥桩基共有钻孔灌注桩332根,桩长26.2--72.3m(自钻孔内液面计,孔深28.2—74.3m),桩径1.25m。选用 GJD1500型钻机(配套的真空泵为6SPS 型射流泵),用反循环清渣钻孔。桩长40m 以下的桩基本上用全套管、清水反循环施工,40m 以上的用半套管(绝大部分套管长35m,少数长42m 左右)及膨润土浆护壁施工。套管顶端焊有4个钢制牛腿,用以支承钻桩平台(图1及图2),套管上接2m 高的周转性钢护筒,以提高
Project Overview New Macao Cotai Bridge main bridge pile foundation has a total of 332 bored piles, pile length 26.2--72.3m (from the bore hole liquid level gauge, hole depth 28.2-74.3m), pile diameter 1.25m. Use GJD1500 type rig (supporting the vacuum pump 6SPS-type jet pump), with reverse circulation slag drilling. Pile length below 40m pile is basically a full set of tubes, water reverse circulation construction, more than 40m with a half casing (most of the casing length 35m, a few 42m long) and bentonite mortar construction. The top of the casing is welded with 4 steel legs to support the drilling platform (Figure 1 and Figure 2). The casing is connected with a 2m high steel casing to improve the