挖孔抗滑樁施工方案.doc

挖孔抗滑樁施工

   抗滑樁是一種靠樁周土體對樁的嵌制來穩定土體，減少滑體推擠力并傳遞部份土推擠力的工程建筑物，對于非塑性滑坡十分有效，特別是由于兩種巖層夾有薄層塑性滑層時效果明顯，對于塑性滑坡，效果較差，尤其對呈塑流狀滑坡體時，不宜使用。
    1.施工方法
    1.1施工中穩定滑坡的措施
    1.1.1清順滑體坡面,鏟除陡坡,陡坎壁,填塞裂縫。如有可能，可根據設計需要，先在滑體范圍內處，分別漿砌圈形截水溝減少地表水下滲。
    1.1.2在抗滑樁施工范圍,應大致整平地面,靠山一側刷出寬度不小于2m的平臺,另一側如系棄碴或松散滑體,即應填平夯實,避免對樁產生側壓。
    1.1.3樁孔開挖,應視下滑力的大小,滑體的土石結構、破壞程度及地下水等不同情況，采用全面同時開挖或跳躍式間隔開挖。
    1.1.4根據地質條件,護壁可采用砼、鋼筋砼、木質和噴護等方法；如地質條件許可，且開挖不深，能確保施工安全，可不支護，一俟挖至設計標高，符合樁基已置于較好的基巖上，井孔垂直且不小于設計尺寸和已達最低一層滑動面下5m以上時，立即綁扎鋼筋（或下預制鋼筋籠），灌注樁身砼，不容拖延時間。
    1.1.5樁孔扎口10m,內不存放大堆材料,棄碴亦應在30m以外,產生震動大的機械應設在50m以外。
    1.2樁身開挖的準備工作
    1.2.1現場核對設計,按設計測定樁位,進行施工放樣。放樣時要根據工地具體情況和施工可能發生的誤差，每邊較設計尺寸略大一些（一般為5cm）。然后整平孔口場地。
    1.2.2在井口上豎井架或搖頭扒桿出碴、進料、起吊高度應高出井口3m以上，搭設臨時風雨棚，做好井口排水溝。為了施工人身安全，井口設欄桿（薄殼支護高出地面者可不設）及供起吊人員裝卸料用的腳踏板和井口開關門。
    1.2.3備置起吊用蘿筐或特制的活底箱、桶及0.5t卷
Construction of Drilled piles

   Pile by pile is a pile embedded in soil on the system to stabilize soil, reduce the pushing force of sliding body and pass most of the engineering building soil pushing force, is very effective for non-plastic slide, especially as two kinds of rocks there are the thin layer of plastic slip effect is obvious, the plastic slide, less effective, especially for plastic flow-like landslide was when unfit for use.
    1. Construction method
    1.1 Construction of measures to stabilize landslide
    1.1.1 Slope clear smooth body, eliminate steep slopes, scarp walls, filling cracks. If possible, can be designed to require, first within the Department in the landslide were ring-shaped mortar and drainage ditches to reduce surface water infiltration.
    1.1.2 in the range of pile construction, should be roughly leveling the ground, backed by the side of the brush width of not less than 2m from the platform, the other side of the case of mucking or loose sliding body that should fill compacted to avoid the pile produce lateral pressure.
    1.1.3 Pile excavation, as the decline in force should be the size of earth and rock sliding body structure, damage and groundwater in different situations, a comprehensive excavation or jump at the same time interval excavation.
    1.1.4 According to geological conditions, Wall adopt concrete, reinforced concrete, wood, and spray methods of protection; such as geological conditions permit, and the excavation is not deep, to ensure the construction safety, why he did not care, once the excavation to the design level, consistent with pile had been placed in a better bedrock, and not less than the design of vertical borehole size and reached the minimum slip surface under a layer of 5m or more, immediately steel banding (or under the prefabricated reinforcement cage), pile concrete body, can not be delay.
    1.1.5 Pile Zhakou 10m, within the non-material storage piles, abandoned outside the ballast should be in the 30m, the mechanical vibrations generated should be located outside the 50m.
    1.2 The preparation of pile excavation
    1.2.1 spot check design, measured according to the design of pile-bit, for construction setting. When setting out the circumstances and according to the construction site for potential error, compared with the design on each side of slightly larger size (typically 5cm). And then leveling orifice site.
    1.2.2 in the wellhead on the shaft frame or shaking derrick mucking, feeding, lifting height should be more than 3m above the wellhead, erection of temporary shelter, good well-head drain. For construction safety, wellhead railing (above the ground who support shell may not) and materials for lifting personnel working with the pedals and the wellhead switch doors.
    1.2.3 Purchase lifting equipment or a special basket with carrots live bottom box, paper barrel and 0.5t
 

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