钻孔灌注桩施工技术交底.doc

筑龙网 WWW.ZHULONG.COM
一、工程概况
xx 特大桥，全长2490.16 m（DK148+553.49～DK151+043.65），基础型
式：温州台为明挖扩大基础，其余全为钻孔桩基础，最深桩长73m；设76
个墩，2 个台，最高墩12m。其中跨永宁江23#～27#墩，自设计水位至承台
底为3.5～10 米不等，要搭设水中施工作业平台，做钢围堰或者薄壁混凝
土围堰施工；另有6 个墩处在水沟、小河和泥浆池中，需设草袋围堰或钢
板桩围堰。所有承台采用低桩承台，有水开挖。柱桩要求桩底嵌入基岩层
不少于2.0m（分布情况详见纵断面图），桩长15.5 m～73 m，总桩长Φ125
计548 根，总长32509 m；Φ150 计56 根，总长3408m；钢筋笼设计为Ⅰ级
钢筋。全桥穿越地层分布为腐殖土、淤泥、砂砾层、粉质粘土、黏土、砂
层、全风化～弱风化凝灰岩层，最大地基承载力1000kpa。
二、施工工艺及程序
施工工艺框图见图2.1
施工程序：场地清理→测量班现场桩位放样→报监理验收→埋设
护筒、制备泥浆、导管泌水试验→报监理验收→钻机就位→钻孔→记
录保存地质资料（地质情况与设计不符报监理及设计单位现场处理）
→钻孔完成、初清→报监理验收→下钢筋笼→报监理验收→下导管→
二清→报监理验收→报工地试验室开配合比、开盘证→拌合站拌混凝
土→罐车运输→灌桩→拔除导管

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First, project survey
xx Bridge length of 2490.16 m (DK148 +553.49 ~ DK151 +043.65), Basic
Type: Wenzhou to Taiwan to cut and expand the base, the rest for the bored pile foundation, the deepest pile length 73m; set 76
A pier, two units, the highest pier 12m. One cross-Yongning 23 # ~ 27 # pier, the water level from design to cap
The end of 3.5 to 10 m. erection of water to the construction platform, making thin-walled steel cofferdam or coagulation
Earth cofferdam; another six piers in ditches, streams and mud pool, need to set up straw bags or steel cofferdam
Sheet pile cofferdam. All of cap low pile caps, water excavation. Piling required pile embedded in bedrock
Not less than 2.0m (see longitudinal distribution map), length of pile 15.5 m ~ 73 m, the total pile length Φ125
Total 548, total length of 32509 m; Φ150 total 56, total length of 3408m; steel cage designed to grade Ⅰ
Reinforced. Stratigraphic distribution of full-bridge across the peat, mud, gravel, clay, clay, sand
Layer, Weathered ~ weak weathered tuff layer, the maximum bearing capacity 1000kpa.
Second, construction techniques and procedures
Figure 2.1 Block diagram of the construction process
Construction process: site clean-up measure classes on-site → Setting → reported Supervision Pile Acceptance → laid
Casing, slurry preparation, catheter bleeding acceptance test → report → Management → mind drilling rig in place →
Save recorded geological data (geological conditions incompatible with the design report and design of units on-site supervision of treatment)
→ drilling completed in the early Qing → reported under the supervision of reinforcement cage → acceptance → acceptance → reported under the supervision of catheter →
2 Qing → acceptance → newspaper reported Supervision Site Laboratory opened with the ratio of mixed opening card → Coagulation Mixing Station
Tanker Transport → soil → → Pile catheters were removed