樁基礎施工技術交底.doc

樁基礎施工技術交底
一、材料
1、水泥標號32.5；
2、碎石：花崗巖最大粒徑30mm ，級配合理，針片狀顆粒含量≤25%，含泥量≤2%，強度達到要求；
3、可采用中粗河砂，含泥量≤5%；
4、水用自來水；
5、鋼筋：縱筋Ⅱ級鋼，橫向加勁筋及螺旋筋Ⅰ級鋼。
以上材料必須有合格證，并按規定抽檢，經監理認可。
二、樁基施工工藝
（一）圍堰筑島：圍堰采用編織袋裝砂，圍堰尺寸按圖施工，內填砂筑島。
（二）鋼護筒采用奪取10mm的A3鋼板卷制。在焊接接頭焊縫處加厚10mm寬20cm的鋼帶，護筒底腳處加厚10mm寬30cm的鋼帶作為刀腳。雙用雙面焊，不得漏水。用樁錘自重下沉。
（三）泥漿采用優質膨潤土制備，在岸上設泥漿池。要檢測其粘度（進出）和相對密度（進出）。
（四）成孔工藝：鉆進前將泥漿加入孔內，用泥漿泵進行循環供漿。鉆進過程中，掌握好濃度，使泥漿既起護壁及懸浮鉆渣作用，又不致于因太濃影響鉆進速度。鉆機準確就位，先快速鉆進。專業人員作好記錄。泥漿比重控制在1.2~1.35，粘度控制在18~22S。待鉆進至微風化基巖達到設計標高或入微化深度為樁的直徑時，通知書監理工程師驗孔，合格證后終孔清碴。
（五）鋼筋籠制安：分節制作按長安放。鋼筋籠采用加勁筋（間距2m ）成型法，布好螺旋筋，籠內每隔2m設置△內撐，沿圓周方向在主筋上分段焊接4個保護耳環，主筋焊接在同一搭接區斷面內接頭率不大于50%。安放采用函節安放，兩節接頭互相焊接，主筋同一搭接斷面接頭率不大于50%。鋼筋定位后，將主筋或其延長筋焊接在護筒上。聲測管同時固定在鋼筋籠上放下，其上下兩端要用銅板封牢，以免漏進泥漿。安放完畢后，立即放下導管進行二次清孔。
（六）灌注水下砼：
1、樁基礎砼標為C25，按實驗室提供的配合比施工。坍落
Pile Foundation Construction Technology Details
One, materials
1, cement grade 32.5;
2, Stone: Granite maximum size 30mm, level with the management, F & E particles content ≤ 25%, mud content ≤ 2%, strength to meet the requirement;
3, can be used in coarse river sand, mud content ≤ 5%;
4, water with tap water;
5, bar: Ⅱ grade steel longitudinal reinforcement, transverse reinforcement bars and spiral steel bar grade Ⅰ.
These materials must be qualified certificate, as required sampling, approved by the Commissioner.
2, Pile Foundation Construction Technology
(A) of the cofferdam construction Islands: cofferdam installed using sand bags, cofferdam size according to the drawings, which fill sand island built.
(B) the casing is to win the A3 steel 10mm roll. Welds in the welded joints of steel 20cm wide and 10mm thick, thick casing the foot end of the strip as a 10mm wide-30cm knife foot. Dual-use double-sided welding, not leaking. Sink with a pile hammer weight.
(C) use of high-quality bentonite mud, mud pools located in the shore. To test its viscosity (and out) and relative density (and out).
(D) hole technology: drilling mud before adding the hole with mud pump for slurry loop. Drilling process, the master concentration, so that both mud residue from the Wall and the role of floating drilling, drilling yet should not affect the speed because of too strong. Drill accurately in place, the first fast drilling. Professional make records. Mud GDP 1.2 to 1.35, viscosity control in the 18 ~ 22S. When the breeze of rock drilling to reach the design elevation, or about nature of the depth of pile diameter, the notice of inspection hole supervising engineer, the certificate after the final hole clean ballast.
(E) reinforcement cage system security: the section produced by Changan release. Reinforced with steel cage reinforcement (spacing 2m) molding method, a good spiral reinforcement fabric, a cage within the support intervals of 2m △ set, along the circumferential direction on the section in the longitudinal bars welded four protection rings, welded longitudinal bars within the same overlapping area section joint rate is not greater than 50%. Section by letter placed placed, two each welded joint, joint reinforcement, the same lap section rate is not greater than 50%. Bar positioning, will extend the reinforcement longitudinal bars or welded on the casing. Acoustic tube fixed to the steel cage at the same time lay down, use their upper and lower ends of copper seal firmly to avoid leakage into the mud. Placed immediately after the second drop tube for clean hole.
(F) pouring underwater concrete:
1, concrete piles labeled C25, provided by laboratories with more than construction. Collapse in
 

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