温州市XXX建设工程打桩施工方案.docx
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温州市XXX建设工程打桩施工方案.docx
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温州市XXX建设工程打桩施工方案
温州市*******建设工程
打
桩
施
工
方
案
******有限公司
1概况·
1.1工程概况············································1
1.2场地工程地质及水文地质条件···························1
1.2.1场地工程地质条件··································1
1.2.2水文地质条件········································4
1.3设计说明及施工要求···································5
1.3.1设计及施工要求··································5
1.3.2桩表·································6
1.4施工组织设计编写依据·································8
2工程施工的方法、准备·
2.1施工方法············································8
2.1.1施工机械设备选型、配备····························8
2.1.2施工作业顺序及机械布置·····························9
2.1.3施工工艺··········································10
2.2施工准备
2.2.1清理平整场地······································10
2.2.2接通施工用电、水源································10
2.2.3搭建临时设施······································11
2.2.4建立抽排水沟、泥浆池、集水坑及外排清水系统········11
2.2.5技术交底··········································11
2.2.6签订原材料供应合同································12
3分部分项工程施工方案·
3.1桩位测放及护筒埋设···································12
3.1.1桩位测放···········································12
3.1.2护筒埋设··········································12
3.2钻孔
3.2.1钻机就位··········································13
3.2.2钻孔垂直度·········································14
3.2.3钻孔直径··········································14
3.2.4钻孔护壁···········································15
3.2.5钻孔深度··········································15
3.2.6清孔换浆(第一次清孔)·····························16
3.3钢筋笼制作、安装····································16
3.4安装导管············································18
3.5二次清孔·············································19
3.6混凝土配合比及砼灌注·································19
3.6.1混凝土灌注········································19
3.6.2混凝土试块制作与养护······························20
3.6.3护筒拔出、回填空孔································21
3.7成桩施工过程中的应急措施·····························21
3.8成本降低措施·········································22
3.9泥浆外运············································22
4施工机械进场、退场计划及工程材料进场计划·
4.1施工机械进场、退场计划······························23
4.2工程材料进场计划·····································23
5施工工期·
5.1施工工期的确定依据···································24
5.2施工工期横道图·······································24
5.3确保工程按期完成的具体措施··························24
6冬雨季施工措施·
6.1质保措施············································26
6.2安全措施············································26
7保证安全生产、文明施工及环境保护的措施
7.1安全生产
7.1.1安全方针与目标·····································27
7.1.2安全生产组织·······································27
7.1.3安全生产准备·······································27
7.1.4安全演习及事故报告·································28
7.1.5安全管理措施······································29
7.1.6安全检查与落实·····································30
7.1.7安全奖罚制度·······································30
7.1.8紧急急救措施及禽流感防治··························30
7.2文明施工············································31
7.3降低环境污染和噪音扰民的措施························33
7.4主要安全技术措施……………………………………………34
8钻孔灌注桩的质量通病与预防措施
8.1钻进中坍孔···········································38
8.1.1钻进中坍孔现象及后果·······························38
8.1.2钻进中坍孔防治措施·································39
8.2钻孔偏斜············································40
8.2.1钻孔偏斜现象、后果及原因···························40
8.2.2钻孔偏斜防治措施··································40
8.3缩孔················································41
8.3.1缩孔现象、后果及原因·······························41
8.3.2防治措施··········································41
8.4掉钻、卡钻和埋钻·····································41
8.4.1掉钻、卡钻和埋钻现象、后果及原因···················42
8.4.2防治措施··········································42
8.5护筒冒水、钻孔漏浆
8.5.1护筒冒水、钻孔漏浆现象、产生后果及原因·············43
8.5.2防治措施··········································43
8.6清孔后孔底沉淀超厚
8.6.1清孔后孔底沉淀超厚现象、产生后果及原因·············44
8.6.2防治措施··········································45
9本工程的重点、难点、特殊部位处理的方法及处理措施·
9.1本工程的重点········································45
9.2本工程的难点········································46
9.2.1掉笼、浮笼·········································46
9.2.2沉渣厚度··········································47
9.3本工程特殊部位的处理方法及措施······················47
10项目管理班子配备及施工人员配置
10.1项目经理部人员构成································48
10.2项目经理部管理人员配置····························48
10.3施工人员配置及岗位职责
10.3.1施工人员配置依据·································48
10.3.2施工人员配置及岗位职责····························49
11质量保证体系与措施
11.1质量管理体系·······································50
11.2质量保证措施·······································51
11.2.1施工准备过程阶段的质量保证措施···················51
11.2.2生产过程阶段的质量保证措施·······················51
11.2.3竣工交接过程阶段的质保措施·······················52
11.3质量验收程序·······································52
12施工现场布置
12.1施工现场平面布置图·································53
12.2施工中的调整·······································54
13施工协调·················································54
13.1内部协调···········································54
13.2外部协调···········································54
13.2.1与试桩测试单位的协调·····························54
13.2.2与基坑支护施工单位的协调·························55
13.2.2与挖土单位和土建单位的施工协调···················55
1概况
1.1工程概况
温州市*********建设工程位于南汇街道东屿村,东面为在建工程,南面为***,西面为***,北面为规划在建道路双***路。
本工程包括******1三个地块,用地总面积为36837.8m2,总建筑面积为140530.6m2(地下41598.4m2,地上96977.95m2,架空层1954.25m2)。
其中C-7-1地块包括8~14#楼和相临地下室,建筑面积74477.93m2,建筑最高处为93.95m;C-8-2地块包括15~17#楼和相临地下室,建筑面积28410.39m2,建筑最高处为49.6m;C-12-1地块包括18~21#楼和相临地下室,建筑面积37642.28m2,建筑最高处为64.95m,共设塔吊6台。
本工程由***投资有限公司开发,***筑设计研究院有限公司设计,***勘察院勘察,***市建设咨询有限公司监理,***有限公司承建。
1.2场地工程地质及水文地质条件
1.2.1场地工程地质条件
根据***工程勘察院勘察结果,将勘察深度揭示的地基岩土划分为5个工程地质层组,细分为12个工程地质亚层(夹层),现自上而下分述如下:
①0层:
杂填土(meQ)
杂色,松散,主要由碎石、块石、粘性土及大量建筑、生活垃圾等组成,均匀性差,局部地段表部5~30cm为混凝土地坪。
该层场地内均有分布,主要分布于场地表部,厚度一般1.0m左右。
①1层:
粘土(al-lQ43)
浅灰黄色,软~可塑,厚层状,中等压缩性,含少量铁锰质氧化斑点,有光泽,干强度高,韧性高,土质不均,往下土质渐变灰变软。
该层场地内除ZKE24孔外均有分布,层厚0.50~1.70m,层顶埋深0.40~1.60m,相应标高2.81~4.65m。
②1层:
淤泥(mQ42)
灰色,流塑,厚层状为主,高压缩性,偶含贝壳碎屑、腐植质及粉细砂斑团,有光泽,干强度高,韧性高。
该层场地内均有分布,层厚12.20~14.10m,层顶埋深1.50~3.10m,相应标高1.41~3.48m。
②2层:
淤泥(mQ42)
灰色,流塑,鳞片状为主,高压缩性,偶含贝壳碎屑及腐植质,有光泽,干强度高,韧性高,土质不均,局部为淤泥质粘土。
该层场地内均有分布,层厚10.10~15.10m,层顶埋深14.50~16.60m,相应标高-11.53~-9.52m。
②3层:
淤泥质粘土(mQ42)
灰色,流塑,细鳞片状,高压缩性,偶含贝壳碎屑和腐殖质,有光泽,干强度高,韧性高,土质不均,局部为淤泥。
该层场地内局部缺失,层厚1.10~7.10m,层顶埋深26.70~28.90m,相应标高-24.70~-20.65m。
④1层:
粘土(al-lQ32-2)
灰黄、黄灰色为主,局部夹兰灰、浅灰色,硬可塑为主,厚层状,中等压缩性,局部含少量铁锰质渲染,稍有光泽,干强度中等,韧性中等,土质不均,局部为粉质粘土。
该层场地内均有分布,层厚6.10~14.80m,层顶埋深26.80~35.30m,相应标高-30.24~-22.53m。
④2层:
粘土(mQ32-2)
灰色,可塑为主,厚层状,中等偏高压缩性,偶含腐殖质和粉细砂斑团,有光泽,干强度高,韧性高,土质不均,局部为粉质粘土。
该层场地内均有分布,层厚2.20~6.90m,层顶埋深38.50~42.80m,相应标高-38.32~-32.45m。
⑤1层:
粉质粘土(al-lQ32-1)
兰灰、黄灰、浅灰色,硬可塑,厚层状,中等压缩性,局部含少量铁锰质斑点或砂含量较高,稍有光泽,干强度中等,韧性中等,土质不均,局部为粘土。
该层场地内均有分布,层厚2.50~9.00m,层顶埋深44.20~48.30m,相应标高-43.55~-38.25m。
⑤2层:
粘土(mQ32-1)
灰、浅灰色,局部夹兰灰色,可塑,厚层状为主,局部微层理,中等压缩性,偶含腐殖质、粉土膜(或薄层)及钙质斑团,局部底部砂含量较高,有光泽,干强度高,韧性高,土质不均,局部为粉质粘土。
该层场地内均有分布,层厚10.50~17.70m,层顶埋深48.10~54.60m,相应标高-50.29~-43.83m。
⑥3’a层:
粗砂(mQ31)
浅灰色,中密,饱和,摇震反应迅速,含少量粘性土,土质不均,局部为中细砂或含少量砾石。
该层场地内零星有分布,分布卵石层之上,层厚1.90~4.00m,层顶埋深61.80~64.50m,相应标高-60.27~-57.58m。
⑥3层:
卵石(alQ31)
灰色为主,夹黄灰、兰灰、紫红色,中密,饱和,厚层状,低压缩性,卵石、圆砾呈次圆形为主,中风化状,母岩成份主要为凝灰岩,卵石粒径一般20~60mm,最大可达150mm以上,含量一般50~70%,局部达75%以上,圆砾粒径一般5~15mm,含量10~30%不等,其余主要为粘性土和砂充填,土质不均,一般上部和下部卵石粒径稍小,中部颗粒较大,局部卵石、砾石含量低时为含粘性土圆砾。
该层场地内均有分布,最大揭见厚度21.30m,层顶埋深63.70~67.80m,相应标高-62.49~-58.79m。
⑥3’b层:
粉质粘土(mQ31)
浅灰、红褐色,可塑,中等压缩性,偶含腐殖质和粉细砂斑团,稍有光泽,干强度中等,韧性中等,局部为粘土。
该层仅ZKE26、ZKE28孔揭示,以夹层状分布于⑥3卵石层中,揭示层厚3.80~4.70m,层顶埋深81.20~84.30m,相应标高-79.73~-76.45m。
1.2.2水文地质条件
(一)地下水的类型与赋存、分布情况
场地分布的地下水主要为赋存于浅部粘性土层、淤泥中的孔隙潜水以及下部碎石层中的孔隙承压水。
1、浅层孔隙潜水
主要赋存于①1层粘性土层、②层淤泥中,埋藏较浅,渗透性能弱,主要接受大气降水与地下迳流补给,以蒸发或向低洼处迳流为主要排泄方式,渗透能力差,水量贫乏,地下水受季节气候变化影响较大。
根据区域水文地质条件,场地年平均潜水位埋深一般为1.0m左右,年变幅在1.0m左右。
由于表部粘土、淤泥质土渗透性差,初见水位明显低于稳定水位,其对工程影响较小。
2、孔隙承压水
主要赋存于⑥3层卵石中,含水层赋水性、连通性相对较好,主要受地层渗流补给,以侧向迳流或人工开采为主要排泄途径,含水层厚度大,水量丰富,非开采状态下水头变化不大,水位相对稳定。
根据区域水文地质资料,并结合临近场地水文地质情况,承压水头埋深12.0m左右,相当于85国家高程-7.50m,因此孔隙承压水对本工程影响小。
(二)地下水、土对建筑材料腐蚀性评价
场地地下水对混凝土具微腐蚀性;对钢筋混凝土结构中的钢筋,长期浸水条件下具微腐蚀性,干湿交替条件下具弱腐蚀性。
(三)地下水对本工程施工的影响
浅部潜水主要赋存于渗透性较小的粘性土和淤泥类土层中,水量较小,对桩基施工影响一般较小;承压水埋深较大,对桩基施工影响较小。
1.3设计说明及施工要求
1.3.1设计及施工要求
1、本工程±0.000相当于黄海高程5.050米。
2、本工程基础采用钻孔灌注桩。
钻孔灌注桩的机具选择、护筒埋设、泥浆护壁、施工要领及清孔等要求应按现行规范和规程处理。
3、钻孔控制标准是:
第一,保证达到设计桩长;第二,主楼桩终孔进入6-3卵石层大于1.5米;地下库桩进入6-3卵石层大于1.0米。
4、钢筋采用:
C为HRB400级钢;φ:
HPB300。
钢筋笼主筋焊接部位错开不小于1米,同一部位接头面积不大于50%,其桩内长度详见桩表。
5、浇桩前必须清除孔底沉渣,且沉渣厚度小于50mm,并在30分钟内完成初灌。
施工时应掌握好混凝土灌注量,加灌高度为1.2米。
6、钢筋笼外侧应设混凝土垫块,以确保钢筋保护层的厚度50mm。
7、工程桩施工容许偏差:
⑴桩心放样小于10mm。
垂直度容许偏差小于1%。
⑵桩中心位移允许偏差为:
①单桩、单排桩、条形桩和群桩基础边桩的允许偏差为100mm。
②条形桩基沿轴线方向和群桩基础中间桩的允许偏差为150mm。
8、质检
⑴每一根桩都要做好一切施工记录,并按规定予留混凝土试件,作28天试压检测。
将上列资料整理好,提交有关部门检查和验收。
⑵试桩荷载试验检验桩承载力能否满足设计要求,低应变检测桩身质量的完整性,或其他有效方法进行鉴定。
1.3.2桩表
桩类型
主楼工程桩
地下车库第一种
地下车库第一种
单桩承载力特征值
2550-2800
1300
1350
直径mm
700
700
700
根数
----
----
---
桩长m
58~62
62
58
笼长m
通长
通长
通长
主筋
10C18
20C22
20C22
加劲箍
C12@2000
Φ14@2000
Φ14@2000
螺旋箍
φ8@250
φ8@250
φ8@250
加密区
φ8@100*3.5m
φ8@100*3.5m
φ8@100*3.5m
桩顶标高
-6.05
-6.05
-9.90
桩身混凝土强度
C30
C30
C30
桩端持力层
6-3层
6-3层
6-3层
桩尖进入持力层
≥1.5m
≥1.0m
≥1.0m
1.4施工组织设计编写依据
1、本工程施工招标文件。
2、本工程桩基施工平面布置图。
3、《岩土工程勘察报告》(详细勘察)。
4、国家相关的、现行的施工规范、规程和技术标准。
5、答疑纪要。
6、我公司所具备的施工条件和实力。
2工程施工的方法、准备
2.1施工方法
2.1.1施工机械设备选型、配备
1、施工机械设备选型依据
根据本工程地质勘察报告、设计和业主的要求,结合我公司以往在该地区的施工经验,本着技术可行、经济合理的原则,我公司决定选择采用GPS-10型钻机。
平均每1.5天可施工钻孔灌注桩1根,单机台效28根/月,本工程桩93完成,拟投入GPS-10型钻机7台套。
采用正循环钻孔、清孔施工工艺。
为解决好钻孔时缩径、坍孔等问题,公司拟采用自制单腰带三翼叉齿钻头在成孔过程中监测成孔孔径的变化,以便调整钻孔泥浆粘度、比重等性能和钻孔钻进速率、转速等施工参数,确保钻孔质量。
这些设备配置、性能完好,结合我公司在类似地质条件和设计要求的工程施工中情况,将会很好地满足本工程的施工质量和设计要求。
2、主要施工机械投入一览表
本工程计划投入设备除上述工程钻机外,还有其它配套设备:
钢筋笼制作设备、检测设备及其它辅助设备等,详细设备见表2《拟投入的主要施工机械设备表》。
2.1.2施工作业顺序及机械布置
根据现场条件和本工程的特点,结合设计方和业主的意见,我公司决定施工顺序如下。
为了使钻机行走路线最短,最大限度的减少移机等辅助时间,同时也为了混凝土运输车便于进出和停靠,针对施工现场条件进行合理布置,大致从外围向内线、从道路远处向道路近处施工,施工阶段的施工顺序按照我方计划的钻机施工行走路线图进行。
2.2施工准备
2.2.1清理平整场地
由于场地为旧厂区,场地较为平整,但地坪下有回填的大块石及地梁和旧桩位,故暂且用挖机在地坪上部清理障碍后再整平、硬化。
2.2.2接通施工用电、水源
施工现场西南角变压器供电为400KVA。
在现场东南角围墙边靠围墙边2米远开挖一处深3米,宽5米,长20米的坑作排污池。
备用发电机1台,以防突然停电而导致相关施工工序的中断而影响工程质量。
从业主指定的电源、水源处接通用电、用水源。
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