基坑围护、降水及土方开挖专项施工方案.doc

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基坑围护、降水及土方开挖工程专项施工方案Special Construction Scheme of Foundation Ditch Support, Precipitation and Earthwork Excavation Engineering
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基坑围护、降水及土方开挖工程专项施工方案Special Construction Scheme of Foundation Ditch Support, Precipitation and Earthwork Excavation Engineering
一、工程概况Project Overview
1.1 概述Summary
工程名称：上海联恒异氰酸脂有限公司MDI扩建项目工艺装置土建工程、
Project Name：Lian heng isocyanate resin co., LTD. Shanghai MDI expansion devices is civil engineering
工程地址：上海市漕泾化工区楚华路25号
Project Address: Shanghai caojing chemical OuChuHua road no. 25

建设单位：上海联恒异氰酸脂有限公司
The construction units: Shanghai lian heng isocyanate resin co., LTD
设计单位：上海科元燃化工程设计有限公司
Design unit: Shanghai yuan combustion engineering design co., LTD
勘察单位：上海岩土工程勘察设计有限公司
Prospecting units: Shanghai geotechnical engineering survey and design co., LTD
施工单位：中国核工业中原建设有限公司
Construction unit: China nuclear industry zhongyuan construction co., LTD
监理单位：上东洋工程（上海）有限公司
Supervision units: the Oriental engineering (Shanghai) co., LTD
1.2工程概况Project Overview：本工程位于上海市漕泾化工区楚华路25号，上海巴斯夫聚氨酯有限公司内的A400地块上。而上海联恒异氰酸脂有限公司MDI扩建项目工艺装置土建工程，由MDI合成单元、MDI初期雨水池、MDA初期雨水池、MDA处理单元、雨淋阀室和管架五大单元组成。
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 engineering. 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 基坑概况Foundation Ditch Overview ：
1.3.1 MDI合成单元Synthetic unit
（1）光气隔离舱、HCL吸收及尾气处理的垫层底标高-2.25m，板底厚为1200mm，垫层厚100mm，建筑面积为638.44m²。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为2.25m。其中，水池的垫层底标高-5.90m，板厚为1000mm，垫层厚100mm，建筑面积为31.59㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为5.9m。
(1) The phosgene compartment, HCL absorption and tail 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, field 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 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压缩机的垫层底标高-1.18m，板厚为1000mm，垫层厚100mm，建筑面积为127.02㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为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 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 1.18 m.
（3） 氯苯冷却、氯苯精馏的承台垫层底标高-2.17m，承台厚度1300mm，垫层厚度100mm；地梁的梁顶标高-0.77m，根据地梁的截面尺寸对梁底进行开挖，其垫层厚度100mm,建筑面积为：2861.71m²。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为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 top 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 + 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 pool
MDI初期雨水池的垫层底标高-3m，板厚为500mm，垫层厚100mm，建筑面积为64.89㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为3m。其积水坑的垫层底标高-3.45m，板厚为500mm，垫层厚100mm，建筑面积为6.25㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为3.45m。
MDI rain early cushion pond bottom elevation -3m, a thickness of 500mm, cushion thick 100mm, construction area of 64.89㎡. 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 of 3m. Its water pit bottom cushion elevation -3.45m, a 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 excavation depth is 3.45m.
1.3.3 MDA合成单元Synthesis unit
（1）合成单元的承台垫层底标高-2.10m，承台厚度1200mm，垫层厚度100mm；地梁的梁顶标高-0.80m，根据地梁的断面尺寸对梁底进行开挖，其垫层厚度100mm；排水沟的垫层底标高为-0.85m，根据图纸的设计要求，底板厚度150-450mm，建筑面积为：2861.71m²。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为2.10m。
(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 requirements 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 ± 0.000m, the excavation depth is 2.10m.
（2）二级冷却水系统、蒸汽吸收系统的承台垫层底标高-1.81m，承台厚度1000mm，垫层厚度100mm；地梁的梁顶标高-0.71m，根据地梁的断面尺寸对梁底进行开挖，垫层厚度100mm；排水沟的垫层底标高为-0.76m，根据图纸的设计要求，底板厚度300-500mm，建筑面积为：661.20m²。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为1.81m。
(2) 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 drains -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 + 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 pool
MDA初期雨水池的垫层底标高-2.95m，板厚为500mm，垫层厚100mm，建筑面积为32.34㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为2.95m。其积水坑的垫层底标高-3.45m，板厚为500mm，垫层厚100mm，建筑面积为6.50㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为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 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 2.95m. Its water pit bottom cushion elevation -3.45m, a thickness of 500mm, cushion thick 100mm, construction area of 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 雨淋阀室Deluge valve chamber
雨淋阀室的垫层底标高-1.30m，板厚为400mm，垫层厚100mm，建筑面积为29.25㎡。本工程设计标高100.000m为±0.000所应对的绝对标高为吴淞标高+4.500m，场地内部自然地面绝对标高约为+4.500m，即为相对标高±0.000m,则开挖深度为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 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 1.30m.
1.4方案选择Scheme Selection
本基坑工程经分析具有以下特点：
1、基坑平面大体呈长方形，开挖面积较大，开挖影响范围内以粉砂性土为主，渗透性较好，降水工作是基坑开挖成败与否的关键；
2、基坑设计挖深一般，设计开挖深度大部分在3m以内；
3、场地周围环境条件不容乐观，基坑周围有已经建好的重要建筑物、构筑物、地下管线等，不具备一定的放坡开挖条件。
根据业主“SLIC-cMDI2-CP02”的设计要求，再结合本工程上述特点，因此本工程所有基坑均不采取坡比放坡；只采用钢板桩进行支护和轻型井点降水的围护，达到降水效果，再对本工程进行土方开挖。
The excavation was analyzed with the following characteristics:
1,A generally flat rectangular pit, excavation 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 built 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 gradings; only use steel sheet piles supporting the envelope and light well point precipitation, achieve precipitation effects, then this earth excavation works.
二、 编制依据Basis of Preparation
2.1 设计图文件，本场地岩土工程勘察报告（工程编号：2015-G-019）；
2.2 施工图纸；
2.3 行业标准《建筑基坑支护技术规程》（JGJ120-2012）；
2.4 国标《建筑地基基础设计规范》（GB50007-2011）；
2.5 国标《建筑地基施工质量验收规范》（GB50202-2002）；
2.6 上海规范《地基基础设计规范》（DGJ08-11-2010）；
2.7 国标《建筑结构荷载规范》（GB50009-2012）；
2.8 土方工程质量验收规范（GEN-0-CIVE-SP-0014）；
2.9 设计要求（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 Foundation 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 "building structural load specifications" (GB50009-2012);
2.8 earthworks Quality Acceptance (GEN-0-CIVE-SP-0014);
2.9 design requirements (SLIC-cMDI2-CP02);
三、 工程场地地质条件Engineering geological conditions
四、 根据岩土工程勘察报告，本场地浅部土层分布如下表所示。
According to geotechnical investigation report, this field shallow soil distribution in the following table.
场地浅部土层分布一览表
Site shallow soil distribution list
层
号Layer No.
土层名称
Soil layer name
重度 kN/m³
直剪固块Straight cut solid block
C（kPa)
Ø(º)
①2-1
吹填土
（粘质粉土夹粉质粘土）Reclaimed soil (clay powder soil clip silty clay)
19.0
10
29.0
①2-2
吹填土
（淤泥质粉质粘土）Reclaimed soil (silt mass silty clay)
17.4
11
18.5
②3-1
砂质粉土Sandy silt
18.9
2
34.0
②3-2
粘质粉土夹粉质粘土Clayey silt silty clay
18.9
12
25.5

四、基坑围护结构设计概况A profile of foundation pit retaining structure design
本工程基坑围护不采取放坡，只采取钢板桩进行支护和轻型井点降水的围护方案。
This engineering foundation pit retaining do not take put slope, only take the steel sheet pile in supporting and light well point precipitation palisade scheme.
4.1土方开挖做法Earthwork excavation practice
土方开挖应先大面积挖至各工号基础基底标高，，为确保各工号工程桩的稳定性，待各工号的钢板柱支护完成后，再进行二级深度开挖，并及时通知监理、业主、勘察单位进行验收，对基础垫层进行浇注。
土方开挖的基底标高应结合结施图进行，基坑土方开挖应分层分段进行，每层开挖深度不得超过2.7 m，开挖长度不得大于60m。
最后20cm土方及地梁、承台等局部深处宜人工开挖，尽量减少对坑底土的扰动，严禁超挖。挖土至坑底标高后应分块施工并在72小时内完成素混凝土垫层，并抓紧施工基础底板。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 prospecting 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 than 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 concrete cushion, and grasping the construction foundation slab.

4.2钢板桩施工方法Steel sheet pile construction method
⑴、基线确定：施工员在基坑边上定出轴线，留出以后施工需要的工作面，确定钢板桩施工位置。参照设计要求（SLIC-cMDI2-CP02）。
⑵、定桩位：按顺序标明钢板桩的具体桩位，洒灰线标明。
⑶、钢板桩施打：
第一根钢板桩插打：吊起钢板桩，打开机头夹板夹住桩头，垂直后在设计位置通过打桩机的液压振动锤将钢板桩插入至设计深度。
后续钢板桩插打：第一根桩打插完成以后，后续钢板桩沿前一根桩的扣槽插入至设计深度。
在钢板桩施工中，打设的允许误差为：桩顶标高偏差±100mm，钢板桩轴线偏差±100mm，钢板桩垂直度偏差为1%；在打设过程中，应监测是否在允许误差范围内，超出时及时纠正。
(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. With 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, after 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 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 s