北京××工程基坑護坡工程施工方案.doc
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基坑護坡工程施工方案
1．概述
北京X工程，位于北京市XX區，東臨XX路，南臨XX。本工程A、B、E座地上XX層，C1～C2、D座地上X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36.30m，±0.000絕對高程為37.50m，基礎埋深約6. 00m。
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．基坑護坡設計及施工方案
2.1 設計依據
2.1 北京市XX勘察院提供的本場地《工程地質勘察報告》。
2.2 體重度統一取為 r = 20kN/m 。
2.3 地面超載按一般情況，考慮為 q=20kN/ m 。
2.4 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》(JGJ120-99 )
《建筑地基處理技術規范》(JGJ79—2002）
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5m、6m、5m、4m，錨筋1φ16，四排錨筋φ，間距依次為1.4m、1.3m、1.3m、1.4m，水平間距1.4m；西側、北側、東南角按1:0.5放坡，共4排土釘，從上至下長度依次為5m、5m、5m、4m，錨筋1φ16，間距依次為1.4m、3m、3m、l.4m，水平間距1.4m.。
以上設計土釘傾角均為5°～100°橫壓筋2φ14通長，豎壓筋2φ14通長，與橫壓筋在土釘墻端部井字架形焊接。土釘成孔直徑100mm鋼筋網片φ6＠200×200，現場綁扎或焊接而成；面層噴射C20混凝土，厚度60～80mm。
本工程采取信息法施工，各段土釘的排數、長度、間距應根據實際情況由現場技術負責人做出調整。
A座西側化糞池采用護坡樁，樁數14根，樁長12m，樁徑600mm,混凝土
Pit Slope Construction Scheme
1. Outline
Beijing X project, located in Beijing XX District, east XX Road, south XX. The project A, B, E Block XX ground floor, C1 ~ C2, D Block, X ground floor, the whole place shear wall. Comprehensive Building 4 story frame structure, located 2 basement. Natural ground elevation of 36.30m, ± 0.000 absolute height is 37.50m, based on depth of about 6. 00m.
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 and construction scheme
2.1 Design Basis
2.1 XX Investigation Institute in Beijing provided the venue, "Engineering geological investigation report."
2.2 The degree of unity of body weight taken as r = 20kN / m.
2.3 Overloading the ground by the general situation, consider q = 20kN / m.
2.4 The 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" (JGJ120-99)
"Treatment of Building technical specifications" (JGJ79-2002)
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 5m, 6m, 5m, 4m, Anchorage 1φ16, four rows Anchorage φ, pitch were 1.4m, 1.3m, 1.3m , 1.4m, level spacing 1.4m; west, north, southeast corner by 1:0.5 sloping, a total of 4 rows of soil nails, from top to bottom length of the order of 5m, 5m, 5m, 4m, Anchorage 1φ16, spacing were 1.4m, 3m, 3m, l.4m, level spacing 1.4m..
Angle over the design of soil nails are 5 ° ~ 100 ° horizontal pressure bar 2φ14 through long, vertical bar 2φ14 pressure on inflation, and the horizontal pressure bar in the soil nail wall frame with welded end crosswise. Nail hole diameter of 100mm steel mesh φ6 @ 200 × 200, field banding or welding; C20 concrete surface jet, thickness 60 ~ 80mm.
Construction of this project to Information Act, the section of rows of soil nails, length, spacing should be based on the actual situation on the spot and technical managers to make adjustments.
The west side of Block A septic tank use of piling, pile number 14, the pile length 12m, pile diameter 600mm, concrete