投标中海堤施工方案

1、1.1 海堤施工方案 Revetment Construction Proposal1.1.1 主要施工内容 Main Construction Works海堤施工主要包括西侧海堤，长约 285m；东侧海堤，长约129.4m；南侧 海堤，长约519m。其断面结构形式均为300KG以内开山石作为堤心料，内侧 采取二片石、倒滤层、土工布的护坡形式，外侧采取碎石垫层、护面块石的 护 坡形式。根据海堤结构形式，结合其底高程的变化，西侧、东侧堤心石施工 考 虑全部陆上抛填；南侧堤心石施工考虑陆上和水上抛石相结合施工的方法。海堤施工计划14个月完成，平均每月 施工强度约18500方。There are t

2、hree revetments to be constructed, that is, west, east & south revetment, which are around 285m,129.4m& 519m respectively in length. All of these revetments are constructed with quarry stone core less than 300kg serving as revetment core materials, and the inner slope protection isconstructedwith In

3、termediate stone, mixed filter layer and geo-textile, while the outer slope protection is constructed with stone cushion layer and armor stone. In consideration of therevetment structure and bottom elevation ranges,the backfilling of quarry stonecoreof the west& eastrevetmentis to be performed in th

4、e manner of onshore construction, while the backfilling of quarry stone core to the south revetment is to be executed via the combination of onshore construction and offshore construction. The revetment is proposed to be completed in 14 monthswith monthly construction strength of 18,500m3.1.1.2 施工顺序

5、 Construction Sequence西侧海堤施工一东侧海堤施工一南侧海堤施工West Revetmentf East RevetmentfSouth Revetment1.1.3 施工流程 Construction Flow基槽开挖一堤心石填筑一海堤内侧护坡施工一护脚施工一外侧护坡施工 Foundation excavation- quarry stone core fillinginner slope protectiontoeprotectionf outer slope protection1.1.4 施工方法Construction MethodA 基 槽开挖 Foundati

6、on Trench Excavation 海堤的基础表层为淤泥质粘土，需要进行基槽开挖。陆上部分采用反铲开挖，自卸车运至抛泥区。水上部分考虑与疏浚工程相结合，采用抓斗式挖泥船进行基槽开挖，1000方 泥 驳运输至附近业主指定的海域进行卸驳。The foundation surface of revetment to be excavatedis silty clay. Onshore excavation is to be carried out with backhoeand the excavatedmaterials are to be transported to the dispos

7、al area by dumpers; offshoreexcavationis to be carried out by grab dredger, 1000m3 hopper barge will be used to transport excavatedmaterials to designatedsea disposalarea.B 堤 心石填筑Filling Quarry Stone Core堤心石填筑考虑陆上抛石和水上抛石相结合施工的方法。陆上抛石是石料直接运输至抛填地点进行抛填，水上抛石是石料运输至临时码头后装驳，方驳运到施工现场，方驳上反铲进行抛石。东侧、西侧海堤采取陆上推进

8、施工从堤根开始，堤心石填筑直接填筑，海堤施工时每隔50m 处设置会车平台。南侧海堤堤心石抛填分两步施工。第一步粗抛，方驳上反铲抛填，考虑长臂反铲上方驳理坡；第二步由陆上推进，自卸车填筑，推土机碾压，反铲或长臂反铲修坡（结合反铲作业半径，海堤底高程为0m 以上 施工段考虑普通反铲修坡，0m 以下施工段考虑长臂反铲修坡，并潜水组配合修坡）。Back-filling of quarrystonecore is to be completed via rip-rap onshore& offshore. For the rip-rap onshore, stone materials are dump

9、ed aftebr eing transported to the site. For the rip-rap offshore, stone materials are shifted to the temporary jetty firstly, then transported to the site by flat barge, and lastly dumped to the site by backhoe on the barge. During the construction of east & west revetment, commence the construction

10、 from the revetmenttoe andfrom the onshore,back-fill corestoneandarrangea vehicle meeting platform every other 50m. The construction of south revetment is to be completed in two steps. In the first step, dump stone roughly by backhoe + flat barge; in thesecondstep, perform construction from onshore,

11、filling with dumper, compacting with bulldozer, trimming the slope with backhoe or long-arm backhoe. Taking intoaccountof the backhoe operation radius, for the construction of trimming slope, use normal backhoe for the revetment with bottom elevation above 0m, and use long arm backhoefor the revetme

12、ntwith bottom elevation under0m with the help of diver team.Fig 4.9 Dumping Stone with Backhoe + Flat BargeFig 4.10 Picture of Filling Quarry Stone CoreC.内侧护坡施工 InnerSlope Protection考虑内侧护坡需在厂区回填前完成，因此每段海堤堤心施工完成之后，需 要先完成内侧的护坡作业，计划采用水陆相结合的施工工艺，自卸车运输石 料 至海堤堤顶，反铲进行抛填并理坡，反铲作业范围外的区域，考虑采用 50T履 带吊上方驳，水上吊抛网兜

13、；Consideredthat the inside slope protection working must be completed before backfilling of station area,the inside slopeprotection is requiredto be completedfirst after completion of dike core construction of eachsection of seawall, for which it is plannedto adopt onshoreand offshore constructionte

14、chnology, i.e., dumpersare used to transportstonematerial to crest of the seawalland backhoeare used to conduct riprapping andslopemaking and it is plannedto riprapping with the 50t crawler crane + flat bargeto lift the steel wire bag in the areabeyond the working scopeof the backhoe.Crawler Crane L

15、ifting and Dumping of StoneD. 土工布铺设 Laying of Geotextile土工布运至现场就位，听从指挥由陆上往水下摊铺，施工尽量选在低潮时 进行，水下施工时派潜水员水下配合。土工布要求紧贴混合倒滤层，并留有 一 定的余量，以平衡土工布收缩和倒滤层基面凹凸不平产生的误差。土工布铺设完毕后，应及时进行其上部袋装碎石压坡施工，以防被水流和波浪冲开，同 时 避免受太阳紫外线照射，使其老化变脆，强度降低，影响土工布铺设质量。After geo-textile being mobilized to the designatedsite,lay thegeo-texti

16、lefrom onshore to offshore. The placement of geo-textile shall be performed during low tide as much as possible and theunderwater laying shall be done with the help of divers. The geotextiles shall be laid closely to the mixed filter layer with certain space, so as to minimize the deviation causedby

17、 the shrinkage of geo-textile and the uneven surface of mixed filter layer. Upon the completion of placing geo-textile, bagged crush stone on the geo-textile shall be laid timely, in case that the geo-textile is washed away by water flow and waves. Meanwhile, the already-laid geo-textile shall be pr

18、otected from the suns ultraviolet rays, since that the exposure under sunshine may cause the geotextile aging, brittle and strengthreducing, and further affect thegeo-textiles quality.E 海 堤护脚施工Toe Protection of Revetment海堤护脚施工待内侧护坡施工完成后开始，反铲装网兜，25T 汽车吊吊网兜装车，自卸车运输至海堤堤顶，50T 履 带吊进行吊抛。After the inner sl

19、ope protection is completed, commencethe construction of revetment toe protection via the mannerfrom onshore.Putstonesinto steelwire bagsby backhoe, lift them with 25T truck crane and transport to site by dumper and then dump them by 50T crawler crane.F 外 侧护坡施工Outer SlopeProtection外侧护坡施工考虑在护脚块石完成后开始，采用反铲直接抛填和履带吊吊抛相结合的工艺进行。反铲作业部分，3m3装载机装块石，自卸车运输至施工场