鉆孔灌注樁施工技術(shù)交底.doc

筑龍網(wǎng) WWW.ZHULONG.COM
一、工程概況
xx 特大橋，全長(zhǎng)2490.16 m（DK148+553.49～DK151+043.65），基礎(chǔ)型
式：溫州臺(tái)為明挖擴(kuò)大基礎(chǔ)，其余全為鉆孔樁基礎(chǔ)，最深樁長(zhǎng)73m；設(shè)76
個(gè)墩，2 個(gè)臺(tái)，最高墩12m。其中跨永寧江23#～27#墩，自設(shè)計(jì)水位至承臺(tái)
底為3.5～10 米不等，要搭設(shè)水中施工作業(yè)平臺(tái)，做鋼圍堰或者薄壁混凝
土圍堰施工；另有6 個(gè)墩處在水溝、小河和泥漿池中，需設(shè)草袋圍堰或鋼
板樁圍堰。所有承臺(tái)采用低樁承臺(tái)，有水開(kāi)挖。柱樁要求樁底嵌入基巖層
不少于2.0m（分布情況詳見(jiàn)縱斷面圖），樁長(zhǎng)15.5 m～73 m，總樁長(zhǎng)Φ125
計(jì)548 根，總長(zhǎng)32509 m；Φ150 計(jì)56 根，總長(zhǎng)3408m；鋼筋籠設(shè)計(jì)為Ⅰ級(jí)
鋼筋。全橋穿越地層分布為腐殖土、淤泥、砂礫層、粉質(zhì)粘土、黏土、砂
層、全風(fēng)化～弱風(fēng)化凝灰?guī)r層，最大地基承載力1000kpa。
二、施工工藝及程序
施工工藝框圖見(jiàn)圖2.1
施工程序：場(chǎng)地清理→測(cè)量班現(xiàn)場(chǎng)樁位放樣→報(bào)監(jiān)理驗(yàn)收→埋設(shè)
護(hù)筒、制備泥漿、導(dǎo)管泌水試驗(yàn)→報(bào)監(jiān)理驗(yàn)收→鉆機(jī)就位→鉆孔→記
錄保存地質(zhì)資料（地質(zhì)情況與設(shè)計(jì)不符報(bào)監(jiān)理及設(shè)計(jì)單位現(xiàn)場(chǎng)處理）
→鉆孔完成、初清→報(bào)監(jiān)理驗(yàn)收→下鋼筋籠→報(bào)監(jiān)理驗(yàn)收→下導(dǎo)管→
二清→報(bào)監(jiān)理驗(yàn)收→報(bào)工地試驗(yàn)室開(kāi)配合比、開(kāi)盤(pán)證→拌合站拌混凝
土→罐車(chē)運(yùn)輸→灌樁→拔除導(dǎo)管

Long Net WWW.ZHULONG.COM building
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

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