四、基坑護坡工程施工方案.doc

擬建北京×工程，位于北京市××區，東臨××路，南臨××。本工程A、B、E座地上××層，C1、C2、C3座地上×層，全現澆剪力墻結構。4層框架結構綜合樓，均設2層地下室。自然地面標高為36.30米，±0.00標高為37.50米，基礎埋深約6.00米。    ’
因施工現場狹窄，為保證周邊建(構)筑物的安全和基礎施工的順利進行，須對基坑進行有效支護。
本場地工程地質性質詳見《工程地質勘察報告》
2、基坑護坡設計方案
2.1  設計依據
    1、北京市××勘察院提供的本場區《工程地質勘察報告》
    2、體重度統一取為r=20kN／m3。
    3、地面超載按一般情況，考慮為q：20kN／m3。
    4、設計與計算遵循國家及北京市有關規范，主要有：
    《建筑地基基礎設計規范》(GB50007—2002)
    《混凝土結構設計規范》(GB50010—2002)
    《建筑基坑支護技術規程》(Jql20—99)
2.2  設計方案
    根據我公司在北京地區施工經驗，結合類似工程實際情況，綜合考慮技術安全和經濟合理，采用錨噴土釘墻方案。東側、南側作斜坡，共4排土釘，從上至下長度依次為5米、6米、5米、4米，錨筋1Ф16，四排錨筋1Ф18，間距依次為1.4米、1.3米、1.3米、1.4米，水平間距1.4米；西側、北側、東南角按1:0.5放坡，共4排土釘，從
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. Comprehensive Building 4 story frame structure, located 2 basement. Natural ground elevation is 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, technical security and comprehensive consideration of 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, 1.4 m horizontal distance; west, north, southeast corner by 1:0.5 sloping, a total of 4 rows of soil nails, from the
 

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