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北京地区河道水流特点是季节性强,雨季水深流急,桥梁下部结构施工一般都力求避开雨季,因此灌注桩多数是在旱地或滩地浅水施工。八○年东护城河劲松平交桥须在7～8月份雨季中进行基础灌注桩施工,河水流速为1米/秒,水深3.2～4.91米。根据河道管理部门的要求,施工设施占用河道流水断面不大于1％(约20平米),这一条件决定了劲松平交桥灌注桩须在深水条件下施工(不能采用常用的筑岛法埋置护筒)。为满足上述雨季通水的要求,我们制定了钢管长护筒方案,经平交桥以及蒲黄榆等三座桥梁的实践证明,这种护筒适合于水深3～5米不筑岛的水下钻孔灌注桩施工,具有体积小、重量轻、刚度大、严密性好、质量可靠、施工方便等特点,其经济效果也是各类深水护
The characteristics of the river flow in Beijing are seasonal and the depth of the rainy season is very acute. The construction of the substructure of the bridge generally seeks to avoid the rainy season. Therefore, most of the bored piles are constructed in the dry land or shallow ground in the beach. The east moat in Jinsongping crossroad in 1980 shall be constructed with basic bored piles in the rainy season from July to August with a river flow velocity of 1 m / s and a water depth of 3.2 to 4.91 m. According to the requirements of the river channel management department, the construction facilities occupy not more than 1% of the river water section (about 20 square meters), which determines that Jinsongping bored piles must be constructed under deep water conditions Casing). In order to meet the requirements of the rainy season above water, we developed a long tube steel tube program, the Pingqiao and Pu Huang Huang, such as the three bridges proved that this tube is suitable for water depth of 3 to 5 meters do not build the island of underwater drilling Bored pile construction, with small size, light weight, stiffness, tightness, good quality, easy construction and other characteristics, the economic effect is all kinds of deep-water protection