基土釬探工程方案.doc

 一、 施工準備
（一） 材料要求
砂：一般為中砂。
（二） 主要機具
1、 工打釬：一般鋼釬，用直徑φ22～25mm的鋼筋制成，釬頭是60°尖錐形狀，釬長1.8～2.1m；穿心錘(重10kg)。
2、 機械打釬：輕便觸探器。
3、 其他：麻繩或鉛絲、梯子(凳子)、手推車、撬棍(拔鋼釬用)和鋼卷尺等。
（三） 作業條件
1、 基土已挖至基坑(槽)底設計標高，表面應平整，軸線及坑(槽)長、寬均符合設計圖紙要求。
根據設計圖紙繪制釬探點平面布置圖，確定釬探點位置及順序編號，按照釬探圖及有關規定進行釬探并記錄。釬探點的布置依據設計要求，當設計無要求時，應按規范規定執行，也可參照表l-l執行。
  Pit Slope Construction Scheme

    Beijing × proposed project, located in Beijing × × area × × Road east, south × ×. The project A, B, E Block, ground × × layer, C1, C2, C3, Block × ground floor, the whole place shear wall. 4 story frame structure of complex building, located 2 basement. Natural surface elevation of 36.30 m, ± 0.00 to 37.50 m elevation, based on depth of about 6.00 meters. '
Narrow due to the construction site, in order to ensure the surrounding building (structures) based on the safety and smooth progress of construction shall be effective on the foundation support.
The geological nature of the site see "Engineering Geological Investigation Report"
2, pit slope design
2.1 Design Basis
    1, Beijing × × Investigation Institute of the site area to provide "engineering geological investigation report"
    2, weight degree of unity is taken as r = 20kN/m3.
    3, overloading the ground by the general situation, consider q: 20kN/m3.
    4, design and calculation to follow the relevant norms of national and Beijing, including:
    "Building Foundation Design Code" (GB50007-2002)
    "Design of concrete structures" (GB50010-2002)
    "Technical Specification for Construction Excavation" (Jql20-99)
2.2 design
    According to our construction experience in the Beijing area, combined with the actual situation similar projects, considering the technical security and economic rationality, use of shotcrete soil nail wall program. East, south to the slopes, a total of 4 rows of soil nails, from top to bottom length of the order of 5 meters, 6 meters, 5 meters, 4 meters, Anchorage 1Ф16, four rows Anchorage 1Ф18, spacing were 1.4 m, 1.3 m, 1.3 m, 1.4 m

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