沉管灌注樁施工方案.doc
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1、工程概況
本合同段沉管樁處理長度54m，管樁直徑377mm，樁長共計8406m，其中K30+350～K30+370段處理深度15m，間距2.5m，178根，共計2670m；K30+370～404段處理深度12m，間距2.0m，478根，共長5736m。
2、施工準備
（1）、施工場地：先清除地表樹木、草皮等雜物，挖除15～30Cm厚的腐植土。清表后進行場地整平，整平后回填一層宕渣。
（2）、施工用電：自配發電機。
（3）、機械安排：根據重錘輕打的原則，結合樁的類型、長度，以及地質條件和以往的施工經驗，擬采用DZ-90型電動振動沉管機。DZ-90型電動振動沉管機的主要組成部件有樁架框架、絞車、滑輪組、電動振動錘、樁管、吊斗、底盤等，主要技術性能指標：行走速度：96m/h；激振力：429～697KN；適用樁長：20m以內；容許抗拔力：240KN。
3、沉管樁施工
（1）、試樁：為了根據樁的設計承載力，確定樁的入土深度；確定合理的撥管速度和充盈系數，在相同的地質條件下，試樁不少于2根。在軟基段上根據設計文件和地質條件合理選擇試樁的位置，并機具就位。采用單打法進行沉樁作業，作業工程中根據沉管速度和電流變化確定地層地質變化情況。沉管至持力層標高或設計標高后，根據沉管時確定的地層地質變化情況，初步擬定拔管速度。在拔管過程中及時測定推算各種地層混凝土的充盈系數，在不能滿足要求時及時采取補救措施。試樁施工完成后，根據試樁確定的施工工藝和參數進行沉管樁的施工。
（2）測量放樣：為使樁位放樣準確，減少中間環節及受地形條件的影響，預應力管樁施工采用樁位坐標點放樣，首先根據計算的坐標引出樁基軸線；樁基軸線的定位點位置在不受
1, Project Overview
Shen paragraph of this contract the length of pipe handling 54m, pipe diameter 377mm, total pile length 8406m, of which K30 +350 ~ K30 +370 section dealing with the depth of 15m, distance 2.5m, 178 root, a total of 2670m; K30 +370 ~ 404 in section of depth of 12m, distance 2.0m, 478 roots, total length 5736m.
2, construction preparation
(1), construction site: the first clear the ground of trees, grass and other debris, excavation 15 ~ 30Cm thick humus. Clear the table after the site leveling, leveling after the backfill layer dawdle residue.
(2), construction of power: from the assigned generator.
(3), mechanical arrangement: According to the hammer tap with the principles of pile type, length, and the geological conditions and previous construction experience, to be adopted DZ-90 electric vibro machine. DZ-90-type of vibration machine electric main component parts of a pile frame frame, winch, pulley block, electric hammer, pile tubes, skip, chassis, etc., the main technical performance indicators: walking speed: 96m / h; excitation : 429 ~ 697KN; for pile length: 20m or less; allow the pullout force: 240KN.
3, Shen pipe pile
(1), pile testing: In order to design under the pile bearing capacity, determine the pile embedded depth; determine a reasonable allocation of control speed and filling factor, in the same geological conditions, the test pile at least 2. Soft segment in the design documents, and geological conditions under the rational choice test pile location, and equipment in place. Used pile driving operations singles method, the operating speed of project management according to Shen and current changes to determine the geology changes. Sinking to the support layer of elevation or design mark, when immersed determined according to the geological formation changes, the initial rate of development of extubation. Determination of extubation time in the process of projection of various strata of concrete filling factor, can not meet the requirements in a timely manner to take remedial measures. Upon completion of test piles, test piles to determine under construction technology and construction parameters Shen pipe.
(2) Surveying setting: In order to accurately Pile Layout and reduce intermediate links and the influence by the terrain conditions, prestressed concrete pipe pile by pile-bit setting out coordinates, the first calculation of the coordinates leads to pile axis; pile axis positioning positions without