沖擊鉆機施工樁基施工工藝.doc

沖擊鉆機施工樁基

1．施工方法
    采用GCF型正循環(huán)鉆機沖擊成孔，鉆頭采用“十字型”，泥漿護壁，泥漿比重1.4～1.8，含砂率6%，膠體率大于95%。孔口護筒采用鋼護筒，護筒壁厚6mm以上，旱地及河灘采用挖埋方式埋置，淺水區(qū)采用筑島圍堰施工，深水區(qū)設(shè)棧橋及工作平臺。鉆進沖程根據(jù)地層情況控制：一般地層2～3m，開孔時及溶洞鉆進時0.8～1.5m。終孔后采用換漿法清孔。鋼筋籠采用分節(jié)預(yù)制，節(jié)長8～10m，吊裝焊接入孔。樁身砼采用φ30垂直導(dǎo)管，拔塞法灌注水下砼。
    溶洞地層樁基施工：上覆層擴大孔徑0.2m鉆孔至基巖面下0.5m處，下入略大于原設(shè)計樁徑0.1m的鋼護筒至孔底以穩(wěn)定上覆層。鋼護筒采用1cm以上厚度的鋼板分節(jié)卷制，節(jié)長2～4m，吊裝入孔焊接。填充溶洞處理：投入片石及粘土，小沖程沖砸擠石造壁加固孔壁；未填充溶洞處理：投入袋裝片石及粘土或水泥筑成島狀，然后小沖程鉆孔通過。
2．施工工藝流程
2.1一般樁基施工工藝流程（見圖1）
2.2溶洞樁基施工工藝流程（見圖2）
3．勞動力組織及進度指標(biāo)
3.1勞動力組織
鉆機工班：采用三班八小時工作制；每班設(shè)班長1名，值班電工1名，汽車吊車司機2名，鉆機司機2名/臺，電焊工1名/臺，勤雜工1名/臺。灌砼工班：采用三班八小時工作制，每班設(shè)班長1名，值班電工1
Percussion Drill Pile Construction

1. Construction Method
    GCF-based cycle drill by now the impact of drilling, drill a "Cross", Slurry Wall, mud weight of 1.4 to 1.8, the rate of 6% sand, gel> 95%. Orifice casing with steel casing, casing thickness 6mm or more, dry and flood embedded with the trenching method, shallow water with the island cofferdam construction, Sham Shui Po District, located bridge and working platform. Stratigraphic drilling stroke cases under control: the general stratigraphic 2 ~ 3m, and the cave when drilling holes when the 0.8 ~ 1.5m. After the final hole for pulp used to clean hole. Use of prefabricated reinforcement cage section, long section of 8 ~ 10m, hoisting welded into the hole. Concrete pile with φ30 vertical conduit, pull plug method pouring underwater concrete.
    Pile Foundation Construction cave formation: the overlying layer to expand drilling to the bedrock surface diameter 0.2m 0.5m under the Department, under the original design into the pile diameter slightly larger than 0.1m of steel casing to the bottom of hole to stabilize the coating. The casing is more than 1cm thick section steel plate rolling, section length 2 ~ 4m, lifting into the hole soldering. Filled cave processing: input and stones and clay, smashing a small stroke red stone wall extrusion reinforced hole wall; not filled cave treatment: put bags and stones and clay or cement built into the island, and then drilling through the small stroke.
2. Construction Process
2.1 General Pile Foundation Construction Process (see Figure 1)
2.2 Pile Foundation Construction process caves (see Figure 2)
3. Labor organizations, and progress indicators
3.1 Labor Organization
Drilling Engineering Class: The Three eight-hour day; class monitor a set, an electrician on duty, vehicle crane driver 2, drill driver 2 / platform, welders 1 / Taiwan, porters 1 / Taiwan . Concrete Engineering Course Irrigation: The Three eight-hour day, the class set up a squad leader on duty electrician 1

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