温州市瓯海大道西段快速路工程Ⅲ标
深
基
坑
专
项
施
工
方
案
编制：
审核：
浙江奔腾建设工程有限公司
温州市瓯海大道西段快速路工程Ⅲ标项目部
2010年5月7日
目 录
一、工程概况··········································3
1、深基坑概况·············································3
2、地质情况···············································4
3、平面位置···············································4
二、编制依据··········································4
三、施工计划··········································5
1、施工时间安排···········································5
2、资源投入情况···········································5
四、工艺方法··········································5
1、总体设想···············································5
2、施工流程···············································6
3、围堰施工···············································6
4、河边桥台开挖支护方法···································6
5、陆地基坑开挖支护方法···································7
6、钢板桩施工·············································7
7、土方开挖···············································8
8、基坑排水···············································9
9、砼结构物施工···········································9
10、钢板桩拔除············································9
五、设计计算··········································9
1、陆地基坑围护计算·······································15
2、河边基坑围护计算······································18
六、安保措施··········································9
1、组织体系建设···········································9
2、沉降监测控制··········································10
3、安全文明措施··········································10
七、其它事项·········································11
1、其它辅助方法··········································11
2、沉木河桥0#台第四幅基坑································11
3、加强与水务部门、地方政府的联系沟通····················12
一、工程概况
1、深基坑概况
瓯海大道西段快速路工程Ш标段全长1061m（k4+124~k5+185）,主要为高架桥梁、地面桥和地面道路等，涉及深基坑的承台和桥台位于半塘河、沉木河、中横河等三座桥梁处。
沉木河桥桥台基底标高-1.30m，老河道标高为+1.5m，台后标高为+3.6m。基坑开挖深度4.9m；
中横河桥桥台基底标高-1.30m，老河道标高为+1.4m，台后标高为+3.4m。基坑开挖深度4.7m；
半塘河桥台基底标高-1.30m，位于旱地，台后标高为+5.2m。基坑开挖深度6.5m；
具体位置和开挖深度如下：
部位 结构物平面尺寸 开挖深度 数量 墩位
中横河桥 5.8×32.5 4.8m 1
5.8×32.5 4.8m 1
5.8×25(7.35) 4.9m 1
5.8×25(7.35) 4.4m 1
沉木河桥 5.8×12.35 4.9m 1 0#台北侧（第一幅）
5.8×13.70 4.9m 1 0#台北侧（第二幅）
5.8×12.70 4.6m 1 0#台南侧（第三幅）
5.8×12.35 4.6m 1 0#台南侧（第四幅）
5.8×12.35 4.8m 1 3#台北侧（第一幅）
5.8×13.70 4.8m 1 3#台北侧（第二幅）
5.8×12.70 4.9m 1 3#台南侧（第三幅）
5.8×12.35 4.9m 1 3#台南侧（第四幅）
半塘河桥 5.8×7.8 6.5m 2 陆上开挖桥台
5.8×17.2 6.5m 2 陆上开挖桥台
5.8×12.7 6.5m 2 陆上开挖桥台
5.8×12.3 6.5m 2 陆上开挖桥台
主线高架 5.2×8.2 6.5m 2 P62、P63墩承台
5.2×8.2 6.5m 1 P92墩承台
2、地质情况
根据地质报告分析，地基土主要由浅表部人工回填土、淤泥土组成。在基坑范围内土层性状及右上至下分述为：
（1）杂填土：杂色，松散~中密，力学性质较差。
（2）淤泥：灰色，饱和，流塑，含腐殖质，具高压缩性，下伏于地表粘土层之下，局部直接露于河床，层厚10.9~20.90m，层顶高程0.8~4.2m。粘聚力=10~12kpa，具有高含水量、高压塑性等特性。
因此桥台（承台）地基主要由淤泥组成，广泛分布在场地上，一般厚度在20~35m，该层土具有含水量大、高压缩性、强度底、透水性差等不良工程地质性质。
3、平面位置
详见附件1
二、编制依据
1、瓯海大道西段快速路工程Ⅲ标段施工图纸、地质勘察报告
2、瓯海大道西段快速路工程Ⅲ标段施工组织设计（总册）
3、《危险性较大的分部分项工程安全管理办法》建质〔2009〕87号文
4、《简明施工计算手册》中国建筑工业出版社（第四版）
5、《城市桥梁工程施工与质量验收规范》CJJ2-2008
6、《钢结构设计规范》GB50017-2003
7、《建筑地基基础设计规范》GB50007-2002
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