【正文】 筒內(nèi)注入泥漿，泥漿注到鉆孔時不外溢為止。 37 鉆進(jìn)：沖擊鉆是利用錘重對孔底地層進(jìn)行沖擊，形成鉆渣經(jīng)過泥漿循環(huán)將孔內(nèi)鉆渣進(jìn)行帶出。 ................ 37 成孔檢查：當(dāng)鉆進(jìn)至孔底達(dá)到設(shè)計標(biāo)高后，停止鉆進(jìn)，提出鉆頭，進(jìn)行成孔檢查，并對孔底渣樣進(jìn)行設(shè)計對比，各項指標(biāo)符合檢驗標(biāo)準(zhǔn)后進(jìn)行清孔。 ............................................................................................................. 37 配制標(biāo)準(zhǔn)泥漿是保證孔壁穩(wěn)定的最根本的措施之一，還具有穩(wěn)定孔內(nèi)水位、冷卻鉆頭等作用，根據(jù)本地段的地質(zhì)情況和以往類似情況的施工經(jīng)驗結(jié)合普通土泥漿和膨脹潤土泥漿性能，護(hù)壁泥漿性能指標(biāo)如下表： ....................................... 37 護(hù)壁泥漿性能指標(biāo) ............................................................................................ 37 相對密度： ...................................................................................................... 37 ～ 膠體率： .......................................................................................................... 37 ≥ 96% ............................................................................................................... 37 粘度： ............................................................................................................. 37 19～ ...................................................................................................... 37 酸堿度： .......................................................................................................... 37 8～ 10 ............................................................................................................. 37 含砂率 ........................................................................................................... 38 8～ 4% ............................................................................................................. 38 失水率 ........................................................................................................... 38 ≤ 25% ............................................................................................................. 38 泥漿制備好后，應(yīng)在泥漿池放置一段時間，才能使用，使外加劑充分水化，保證泥漿質(zhì)量。 .................................... 38 經(jīng)過鉆孔結(jié)果論證，以上操作滿足施工要求。 ................................................................................................ 38 成孔檢測 ............................................................................................... 38 檢驗部位 ........................................................................................................ 38 檢驗項目 ........................................................................................................ 38 評定標(biāo)準(zhǔn) ........................................................................................................ 38 實測數(shù)據(jù) ........................................................................................................ 38 鉆孔 ............................................................................................................... 38 孔位偏差 （ mm） ............................................................................................. 38 50 .................................................................................................................. 38 3 .................................................................................................................... 38 挺斜度 （ mm） ............................................................................................. 38 小于 1% 樁長且不小于 500.............................................................................. 38 10 .................................................................................................................. 38 孔深 （ m） ............................................................................................... 38 符合設(shè)計要求 ....................................................................................... 38 ............................................................................................................... 38 孔徑 （ m） ............................................................................................... 38 不小于設(shè)計值 .......................................................................................... 38 ............................................................................................................... 38 孔底 沉渣厚度 ................................................................................................. 38 端承樁≤ 50mm ................................................................................................. 38 20 .................................................................................................................. 38 泥漿 ............................................................................................................... 38 相對密度 ........................................................................................................ 38 ~ ........................................................................................................ 38 ............................................................................................................... 38 含砂率 ........................................................................................................... 39 小于 2% .......................................................................................................... 39 1% .................................................................................................................. 39 稠度 ............................................................................................................... 39 17~20Pa。把主筋擺放在平整的工作平臺上，并標(biāo)出加強(qiáng)筋的位置。焊接完成后，必須將其焊渣清除干凈。 ................................................. 40 在鋼筋加工過程中采用事先對鋼筋進(jìn)行分布， 并在加強(qiáng)筋上進(jìn)行打點，然后上筋。 .............................................................................. 40 在灌注前對聲測管內(nèi)加清水，使聲測管內(nèi)形成壓力，并對聲測管進(jìn)行封口。起吊時，先提第一點，使骨架稍提起，再與第二吊同時起吊。當(dāng)鋼筋籠全部按要求吊裝到設(shè)計位置后，將接長主筋吊環(huán)固定牢靠，以防鋼筋籠上浮或下沉。 10 ............................................................................................................... 41 基礎(chǔ)、錨碇、墩臺、柱 ................................................................................... 41 177