吹砂填筑路堤技术交底.doc

吹砂填筑路堤技术交底
一. 一般要求 (一)   材料：
1、中、粗砂为宜，含砂量（即小于74μm的颗粒粒径）不宜大于10%。     2、片石：采用较大的块石，一般粒径不小于0.3m，石料抗压强度大于20Mpa,未风化。 (二)  操作工艺：     1、首先清除场地内地表草皮，腐植土以及植物根系，然后对天然地基进行碾压；要求地面以下1m范围内土基压实度（重型）不小于85%。     2、用挖掘机在路堤坡脚位置挖出临时排水沟（施工期间用土质边沟，待路基预压期结束，沉降及侧向位移稳定后，再浆砌片石）。     3、对于搅拌桩路段，完成桩体后铺碎石垫层，再吹填路基。     4、利用编制砂袋在护道位置修筑挡水堤，其高度应按吹砂高度而定，最少应高出吹堤高度30～50cm。挡水堤顶部宽度应不小于1m，挡水堤要求坚实，不留空洞，要将填砂范围与路基两侧农田彻底隔离。 　　5、开始吹填工作。每个吹填区设置长40m的泄水口，设于围堰中部，以排出泥水，必要时可配备抽水机排水。     6、当路堤高度小于2m时，可作一次吹填，当路堤高度大于2m时，应分层吹填，分层吹填的厚度一般为1-2米。     7、吹填标高控制，测量标桩拟30m×30m设
Blowing sand filling embankment Technology Details
1. General requirements (a) Material:
1, the coarse sand is appropriate, the sand content (that is less than 74μm particle size) should not be greater than 10%. 2, rubble: the larger the stone, the general size not less than 0.3m, stone compressive strength greater than 20Mpa, not weathering. (B) the operation process: 1, first clear the site in the Mainland table turf, humus and plant roots, then the natural foundation for RCC; requirements 1m below the surface of the soil-based compaction (heavy duty) not less than 85%. 2, with the excavator dug in the location of the foot embankment temporary drainage ditches (with the soil during the construction of ditches, until the end of preloading embankment, settlement and lateral displacement of stable, then mortar and stones). 3, the mixing section, completed after the gravel pile cushion, and then hydraulic fill embankment. 4, use of sand bags in preparation of construction of water retaining embankment berm location, its height should be high blowing sand, blowing at least should be higher than the levee height 30 ~ 50cm. Retaining embankment top width shall be not less than 1m, retaining embankment required a solid, without leaving empty areas to fill with sand embankment on both sides of farmland complete isolation. 5 Reclamation work began. Reclamation District, 40m long each set of discharge ports, located in the central cofferdam to discharge muddy water, if necessary, can be equipped with water pumps. 6, when the embankment height is less than 2m, to be a reclamation, when the embankment height greater than 2m should be layered back filling, layered back filling of the thickness of 1-2 meters. 7, hydraulic fill level control, measuring 30m × 30m stake to be set