1、基坑圍護、降水及土方開挖工程專項施工方案Special Construction Scheme of Foundation Ditch Support, Precipitation and Earthwork Excavation Engineering一、工程概況Project Overview1.1 概述Summary工程名稱：上海聯恒異氰酸脂有限公司MDI擴建項目工藝裝置土建工程、Project Name：Lian heng isocyanate resin co., LTD. Shanghai MDI expansion devices is civil engineering工程地址

2、：上海市漕涇化工區楚華路25號Project Address: Shanghai caojing chemical OuChuHua road no. 25建設單位：上海聯恒異氰酸脂有限公司The construction units: Shanghai lian heng isocyanate resin co., LTD設計單位：上海科元燃化工程設計有限公司Design unit: Shanghai yuan combustion engineering design co., LTD勘察單位：上海巖土工程勘察設計有限公司Prospecting units: Shanghai geotec

3、hnical engineering survey and design co., LTD施工單位：中國核工業中原建設有限公司Construction unit: China nuclear industry zhongyuan construction co., LTD監理單位：上東洋工程（上海）有限公司Supervision units: the Oriental engineering (Shanghai) co., LTD1.2工程概況Project Overview：本工程位于上海市漕涇化工區楚華路25號，上海巴斯夫聚氨酯有限公司內的A400地塊上。而上海聯恒異氰酸脂有限公司MDI擴

4、建項目工藝裝置土建工程，由MDI合成單元、MDI初期雨水池、MDA初期雨水池、MDA處理單元、雨淋閥室和管架五大單元組成。This project is located in Shanghai City Caojing Chemical District Chu Hua Road No. 25, Shanghai BASF Polyurethane Co. Ltd in A400 block. And Shanghai Lianheng ISO cyanate grease Co., Ltd. MDI expansion project process device for civil eng

5、ineering. By synthesizing MDI unit, MDI early rain pool, MDA in the early rain pool, MDA treatment unit, the deluge valve chamber and tube frame five unit composed.1.3 基坑概況Foundation Ditch Overview ：1.3.1 MDI合成單元Synthetic unit（1）光氣隔離艙、HCL吸收及尾氣處理的墊層底標高-2.25m，板底厚為1200mm，墊層厚100mm，建筑面積為638.44m²。本工程

6、設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為2.25m。其中，水池的墊層底標高-5.90m，板厚為1000mm，墊層厚100mm，建筑面積為31.59。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為5.9m。(1) The phosgene compartment, HCL absorption and tail

7、gas treatment of cushion bottom elevation of 2.25 m, the bottom of the plate thickness is 1200 mm, cushion thickness of 100 mm, with a construction area of 638.44 m squared. This engineering design elevation of 100.000 m by 0.000 mm to cope with the absolute level of wusong elevation + 4.500 m, fiel

8、d inside the natural ground elevation is about 4.500 m + absolutely, is the relative elevation + / - 0.000 m, the excavation depth of 2.25 m. Pool of cushion bottom elevation of 5.90 m, the thickness is 1000 mm, cushion thickness of 100 mm, with a construction area of 31.59 . This engineering design

9、 elevation of 100.000 m by 0.000 mm to cope with the absolute level of wusong elevation + 4.500 m, field inside the natural ground elevation is about 4.500 m + absolutely, is the relative elevation + / - 0.000 m, the excavation depth of 5.9 m. （2）HCL壓縮機的墊層底標高-1.18m，板厚為1000mm，墊層厚100mm，建筑面積為127.02。本工程

10、設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為1.18m。(2)HCL compressor cushion bottom elevation of 1.18 m, thickness is 1000 mm, cushion thickness of 100 mm, with a construction area of 127.02 . This engineering design elevation of 100.000 m by 0.000 mm t

11、o cope with the absolute level of wusong elevation + 4.500 m, field inside the natural ground elevation is about 4.500 m + absolutely, is the relative elevation + / - 0.000 m, the excavation depth of 1.18 m.（3） 氯苯冷卻、氯苯精餾的承臺墊層底標高-2.17m，承臺厚度1300mm，墊層厚度100mm；地梁的梁頂標高-0.77m，根據地梁的截面尺寸對梁底進行開挖，其墊層厚度100mm,建筑

12、面積為：2861.71m²。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為2.17m。(3) the effects of cooling, chlorobenzene rectifying cap cushion bottom elevation of 2.17 m, the thickness of the pile caps is 1300 mm, cushion thickness 100 mm; Ground beam beam t

13、op elevation of 0.77 m, the base beam to the excavation of the bottom of the beam, the section size of the cushion thickness is 100 mm, with a construction area of for: 2861.71 m squared. This engineering design elevation of 100.000 m by 0.000 mm to cope with the absolute level of wusong elevation +

14、 4.500 m, field inside the natural ground elevation is about 4.500 m + absolutely, is the relative elevation + / - 0.000 m, the excavation depth of 2.17 m.1.3.2 MDI初期雨水池Early rain poolMDI初期雨水池的墊層底標高-3m，板厚為500mm，墊層厚100mm，建筑面積為64.89。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m

15、，即為相對標高±0.000m,則開挖深度為3m。其積水坑的墊層底標高-3.45m，板厚為500mm，墊層厚100mm，建筑面積為6.25。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為3.45m。MDI rain early cushion pond bottom elevation -3m, a thickness of 500mm, cushion thick 100mm, construction area of 64.89. The

16、engineering design elevation 100.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation ± 0.000m, the excavation depth of 3m. Its water pit bottom cushion elevation -3.45m, a

17、thickness of 500mm, cushion thick 100mm, construction area of 6.25. The engineering design elevation 100.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation ± 0.000m, the e

18、xcavation depth is 3.45m.1.3.3 MDA合成單元Synthesis unit（1）合成單元的承臺墊層底標高-2.10m，承臺厚度1200mm，墊層厚度100mm；地梁的梁頂標高-0.80m，根據地梁的斷面尺寸對梁底進行開挖，其墊層厚度100mm；排水溝的墊層底標高為-0.85m，根據圖紙的設計要求，底板厚度150-450mm，建筑面積為：2861.71m²。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為2.10m。

19、(1) Synthesis units elevation -2.10m, caps thickness 1200mm, cushion thickness 100mm; top elevation beam to beam -0.80m, cross-sectional dimensions of the beam at the end of the beam base excavation, the mat thickness of 100mm; cushion bottom elevation drains -0.85m, according to the design requirem

20、ents of the drawings, floor thickness 150-450mm, construction area: 2861.71m². The engineering design elevation 100.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation 

21、7; 0.000m, the excavation depth is 2.10m.（2）二級冷卻水系統、蒸汽吸收系統的承臺墊層底標高-1.81m，承臺厚度1000mm，墊層厚度100mm；地梁的梁頂標高-0.71m，根據地梁的斷面尺寸對梁底進行開挖，墊層厚度100mm；排水溝的墊層底標高為-0.76m，根據圖紙的設計要求，底板厚度300-500mm，建筑面積為：661.20m²。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為1.81m。(2)

22、 Bottom cushion caps secondary cooling water systems, vapor absorption system level -1.81m, caps thickness 1000mm, cushion thickness 100mm; Beams Beams top elevation -0.71m, cross-sectional dimensions of the beam to beam Base excavation bottom, cushion thickness 100mm; cushion bottom elevation drain

23、s -0.76m, according to the design requirements of the drawings, floor thickness 300-500mm, construction area: 661.20m². The engineering design elevation 100.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about

24、 + 4.500m, is the relative elevation ± 0.000m, the excavation depth is 1.81m.1.3.4 MDA初期雨水池Early rain poolMDA初期雨水池的墊層底標高-2.95m，板厚為500mm，墊層厚100mm，建筑面積為32.34。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為2.95m。其積水坑的墊層底標高-3.45m，板厚為500mm，墊層厚100mm，建筑面

25、積為6.50。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為3.45m。MDA rain early cushion pond bottom elevation -2.95m, a thickness of 500mm, cushion thick 100mm, construction area of 32.34. The engineering design elevation 100.000m addressed by an absolute e

26、levation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation ± 0.000m, the excavation depth is 2.95m. Its water pit bottom cushion elevation -3.45m, a thickness of 500mm, cushion thick 100mm, construction area of

27、 6.50. The engineering design elevation 100.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation ± 0.000m, the excavation depth is 3.45m.1.3.5 雨淋閥室Deluge valve chamber雨淋閥室的墊

28、層底標高-1.30m，板厚為400mm，墊層厚100mm，建筑面積為29.25。本工程設計標高100.000m為±0.000所應對的絕對標高為吳淞標高+4.500m，場地內部自然地面絕對標高約為+4.500m，即為相對標高±0.000m,則開挖深度為1.30m。Cushion deluge valve chamber bottom elevation -1.30m, a thickness of 400mm, cushion thick 100mm, construction area of 29.25. The engineering design elevation 1

29、00.000m addressed by an absolute elevation ± 0.000 Wusong elevation + 4.500m, natural floor space inside the absolute elevation of about + 4.500m, is the relative elevation ± 0.000m, the excavation depth is 1.30m.1.4方案選擇Scheme Selection本基坑工程經分析具有以下特點：1、基坑平面大體呈長方形，開挖面積較大，開挖影響范圍內以粉砂性土為主，滲透性較

30、好，降水工作是基坑開挖成敗與否的關鍵；2、基坑設計挖深一般，設計開挖深度大部分在3m以內；3、場地周圍環境條件不容樂觀，基坑周圍有已經建好的重要建筑物、構筑物、地下管線等，不具備一定的放坡開挖條件。根據業主“SLIC-cMDI2-CP02”的設計要求，再結合本工程上述特點，因此本工程所有基坑均不采取坡比放坡；只采用鋼板樁進行支護和輕型井點降水的圍護，達到降水效果，再對本工程進行土方開挖。The excavation was analyzed with the following characteristics:1,A generally flat rectangular pit, excava

31、tion larger excavation within the scope of the silt of the soil, good permeability, precipitation excavation work is the key to success or failure;2, deepening pit design in general, most of the excavation depth design within 3m;3, site ambient conditions can not be optimistic, foundation has been b

32、uilt around important buildings, structures, underground pipelines, which does not possess the necessary grading or excavation.According to the owners "SLIC-cMDI2-CP02" design requirements, combined with the above characteristics of the project, so this project not take all pit slope ratio

33、 gradings; only use steel sheet piles supporting the envelope and light well point precipitation, achieve precipitation effects, then this earth excavation works.2、 編制依據Basis of Preparation2.1 設計圖文件，本場地巖土工程勘察報告（工程編號：2015-G-019）；2.2 施工圖紙；2.3 行業標準建筑基坑支護技術規程（JGJ120-2012）；2.4 國標建筑地基基礎設計規范（GB50007-2011）；

34、2.5 國標建筑地基施工質量驗收規范（GB50202-2002）；2.6 上海規范地基基礎設計規范（DGJ08-11-2010）；2.7 國標建筑結構荷載規范（GB50009-2012）；2.8 土方工程質量驗收規范（GEN-0-CIVE-SP-0014）；2.9 設計要求（SLIC-cMDI2-CP02）；2.1 design document, this Site Investigation Report (project number: 2015-G-019);2.2 construction drawings;2.3 industry standard "Building F

35、oundation Pit Technical Specification" (JGJ120-2012);2.4 GB "Building Foundation Design Code" (GB50007-2011);2.5 GB "Building Foundation Construction Quality Acceptance" (GB50202-2002);2.6 Shanghai norms "Foundation Design Code" (DGJ08-11-2010);2.7 GB "buildin

36、g structural load specifications" (GB50009-2012);2.8 earthworks Quality Acceptance (GEN-0-CIVE-SP-0014);2.9 design requirements (SLIC-cMDI2-CP02);3、 工程場地地質條件Engineering geological conditions4、 根據巖土工程勘察報告，本場地淺部土層分布如下表所示。According to geotechnical investigation report, this field shallow soil dist

37、ribution in the following table.場地淺部土層分布一覽表Site shallow soil distribution list層號Layer No.土層名稱Soil layer name重度 kN/m³直剪固塊Straight cut solid blockC（kPa)Ø(º)2-1吹填土（粘質粉土夾粉質粘土）Reclaimed soil (clay powder soil clip silty clay)19.01029.02-2吹填土（淤泥質粉質粘土）Reclaimed soil (silt mass silty clay)17.

38、41118.53-1砂質粉土Sandy silt18.9234.03-2粘質粉土夾粉質粘土Clayey silt silty clay18.91225.5四、基坑圍護結構設計概況A pro foundation pit retaining structure design本工程基坑圍護不采取放坡，只采取鋼板樁進行支護和輕型井點降水的圍護方案。This engineering foundation pit retaining do not take put slope, only take the steel sheet pile in supporting and light well poi

39、nt precipitation palisade scheme.4.1土方開挖做法Earthwork excavation practice土方開挖應先大面積挖至各工號基礎基底標高，為確保各工號工程樁的穩定性，待各工號的鋼板柱支護完成后，再進行二級深度開挖，并及時通知監理、業主、勘察單位進行驗收，對基礎墊層進行澆注。土方開挖的基底標高應結合結施圖進行，基坑土方開挖應分層分段進行，每層開挖深度不得超過2.7 m，開挖長度不得大于60m。最后20cm土方及地梁、承臺等局部深處宜人工開挖，盡量減少對坑底土的擾動，嚴禁超挖。挖土至坑底標高后應分塊施工并在72小時內完成素混凝土墊層，并抓緊施工基礎底板

40、。Earthwork excavation should be large dig to the working of basal level, and in order to ensure the stability of the working engineering pile, stay after completion of the work number plate column support, then the secondary excavation depth, and timely notify supervision, owners and acceptance pros

41、pecting units, the casting was carried out on the foundation pad.Earth excavation of basement level should be combined with knot figure, earth excavation of foundation pit should be layered segments, shall not be more than 2.7 m, each layer excavation depth excavation length shall not be greater tha

42、n 60 m.Last 20 cm earthwork and ground beam, caps and other local appropriate artificial excavation depth, try to reduce the disturbance of bottom soil, it is strictly prohibited to dig. Should be block construction after digging to the bottom elevation and within 72 hours to complete the plain conc

43、rete cushion, and grasping the construction foundation slab.4.2鋼板樁施工方法Steel sheet pile construction method 、基線確定：施工員在基坑邊上定出軸線，留出以后施工需要的工作面，確定鋼板樁施工位置。參照設計要求（SLIC-cMDI2-CP02）。 、定樁位：按順序標明鋼板樁的具體樁位，灑灰線標明。、鋼板樁施打：第一根鋼板樁插打：吊起鋼板樁，打開機頭夾板夾住樁頭，垂直后在設計位置通過打樁機的液壓振動錘將鋼板樁插入至設計深度。后續鋼板樁插打：第一根樁打插完成以后，后續鋼板樁沿前一根樁的扣槽插入至設計

44、深度。在鋼板樁施工中，打設的允許誤差為：樁頂標高偏差±100mm，鋼板樁軸線偏差±100mm，鋼板樁垂直度偏差為1%；在打設過程中，應監測是否在允許誤差范圍內，超出時及時糾正。(1)Baseline to determine: the builder set axis on the edge of the foundation pit, set aside after the construction needs of the working face, determine the position of steel sheet pile construction. Wit

45、h reference to the design requirements (SLIC - cMDI2 - CP02).Diction, pile location: the order clearly indicate the concrete pile, steel sheet pile with grey line marked.(3)Steel sheet pile type:First root steel sheet pile inserted: hoist steel sheet pile, open the nose clips pile head splints, afte

46、r the vertical design position through the hydraulic vibration hammer pile-driver insert steel sheet pile to design depth.Subsequent steel sheet pile in play: after the completion of the first root pile inserted, subsequent steel sheet pile along the former a buckle groove insert to the design depth

47、 of the pile.During the construction of steel sheet pile, the play of permissible error is: the pile top elevation deviation plus or minus 100 mm, the steel sheet pile axis deviation plus or minus 100 mm, steel sheet pile verticality deviation is 1%; In the process of play set, whether should be mon

48、itored within the scope of permissible error, beyond the correct in time.4.3輕型井點降水Light well point precipitation根據基礎及現場周邊情況，在第一層基礎開挖深度2.7m內的設置輕型井點設備，總管直徑選用125，井點管直徑選用48，井點管深5m，井點管排列間距視現場開挖土質情況而定。先埋設總管，再埋設井點管，用彎管將井點管和總管連通，然后安裝抽水設備。According to the foundation and the situation around, in the first lay

49、er of foundation excavation depth of 2.7 m in the Settings of the light well point equipment, choose 125 main pipe diameter, choose 48 well point pipe diameter, deep well point pipe 5 m, well point pipe arrangement spacing depends on the site excavation soil conditions.Plant manager first, embedded

50、well point pipe again, with bent pipe well point pipe and main pipe connected, and then pumping equipment installation.5、 施工部署Construction of the deployment5.1項目管理組織Project management organization5.1.1 組建項目指揮部Establish project headquarters由于土方量較大，為確保工程順利進行，首先組建一個項目指揮部，總指揮下設：技術組：主要負責施工方案的編制及施工過程中技術問題

51、的處理。土方組：主要負責基礎土方挖土、運輸、棄土場地。安保組：負責基坑挖土的安全事宜。配合組：配合前方施工、機械維修及路口指揮等。Due to large earthwork quantity, in order to ensure the smooth progress of the project first to form a project headquarters, commander in chief sets:Technology group, mainly be responsible for the technical problems in the process of c

52、onstruction scheme and construction processing.Earthwork groups: mainly responsible for earthwork digging, transportation, and soil site.Security group: responsible for the safety of the foundation pit digging.Cooperate with group: cooperate with construction, mechanical maintenance and intersection

53、 ahead command, etc.施工管理網絡Construction management networkproject manager：XXX配合組Cooperate group安保組Security group土方組Earthwork group技術組Technology group技術負責人Technical director：XXX安 全 員：Security Officer XXX安 全 員Security Officer：XXX安 全 員：Security Officer XXX技 術 員Technicians：XXX施 工 員Construction Worker：XXX

54、質 量 員Quality staff：XXX機 修 員：Machine repair staffXXX 5.1.2組織管理Organization Management建立以項目經理為中心的質量管理目標和職責體系，現場技術負責人、施工員、觀砌、質量具體實施質量管理，對施工質量進行交底、檢查、監督，全面協調各專業施工單位的配合工作。嚴格審查專業分包單位資質，如實掌握其施工力量、施工經驗，達不到要求的禁止其進場施工。堅持對作業人員的持證上崗制度的檢查，特別是電焊工、挖掘機司機等特殊工種持證上崗的檢查。質量技術交底：工程開工前，由公司技術負責人對整體工程進行交底，分部工程開工前，由項目技術負責人對子

55、分部進行技術交底。嚴格執行技術交底制度，每項工作開工前，由施工員對班組進行質量技術交底，其內容包括施工工藝、操作規程、質量要求、質量通病防治等。對關鍵部位施工要點和質量要求更要仔細交底。加強對現場管理人員和作業人員的質量意識教育和技術培訓工作，做到上崗前管理人員質量檢查標準和作業人員施工質量標準人人心中有數，項目部質量員做好質量檢查資料收集、申報、整理工作。 Establish a project manager for the center's quality management system objectives and responsibilities, technical d

56、irector of site, construction workers, the concept of the puzzle, the quality of the specific implementation of quality management, quality tests, construction, inspection, supervision, and overall coordination of the professional construction unit jobs. Scrutiny of professional qualifications subco

57、ntractors, truthfully grasp its power and construction experience construction, mainly the prohibited entering the construction. Adhere to the examination of the system of certificates of workers, particularly welders, excavator drivers, and special types of certificates of inspection. Quality techn

58、ical tests: Before the project started, the company responsible for the overall project technical tests, carried out before the project starts division, technical director of the project sub-division technical disclosure. Strict implementation of the technical disclosure system, before each job star

59、ted by the construction workers quality technical tests on the team, which includes construction techniques, procedures, quality requirements, quality control and other common problem. Key parts of construction elements and quality requirements more carefully disclosure. To strengthen on-site management and operations personnel of the quality of education and technical training, pre-service managers to do quality checks and quality standards for