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1、一、 概述General 90萬噸/年乙烯裝置地下管道污染雨水及生產(chǎn)污水管道（SD）部分主管線施工時(shí)，由于溝深較深，且靠近裝置區(qū)已經(jīng)施工完畢的道路，故管溝開挖時(shí)無法進(jìn)行放坡處理，為防止開挖時(shí)發(fā)生塌陷，將已經(jīng)施工完畢的路基破壞掉，因此靠近路邊的溝槽邊坡在施工時(shí)需要進(jìn)行特殊施工技術(shù)處理，經(jīng)慎重考慮，采用打鋼板樁的方式來保護(hù)路基。需要進(jìn)行技術(shù)處理的道路有2#路（MHS.PC-08MHS.PC- 11之間）、4#路、8#路（MHS.PC-49MHS.PC- 51之間）、10#路。During the main pipeline construction of pollution rain water 2、and production pollution pipe (SD) in UG pipe of 900 KTAY ethylene plant ,we will implement the special construction technical treatment to the trench bank preventing collapse and damage to the completed road base instead of sloping treatment which could not be executed as proposed before because of3、 the trenchs depth and the completion of the road adjacent to the plant. With carefully consideration ,we take the method of driving steel plate pile to protect the road base and this method will be used upon NO.2 Road (between MHS.PC-08 & MHS.PC- 11),NO.4 Road ,NO.8 Road (between MHS.PC-49 & MHS.PC4、-51) and NO.10 Road.二、鋼板樁施工 steel plate construction 2.1、開挖前，首先進(jìn)行管溝開挖放線。Setting out before trench excavation. 2.2、管溝開挖應(yīng)提前進(jìn)行井點(diǎn)降水，確保施工階段溝槽無地下水。Well point dewatering before trench excavation to ensure there remains no UG water during the whole period of construction.2.3、溝槽最深挖掘深度為4.6米，因此采用拉森鋼板樁，規(guī)格為12米/根5、。The max depth of the trench excavated is 4.6m and we use the LASEN steel plate pile which length is 12 meter。2.4、鋼板樁的位置距離管帶基礎(chǔ)600mm。鋼板樁位于道路一側(cè)，采用單側(cè)鋼板樁鋪設(shè)方法。溝槽另一側(cè)進(jìn)行放坡，坡度不小于1：1。The distance between the steel and the pipeline foundation is 600mm. Drive steel plate pile on one side of the trench and slope6、 on the other side with the grade no less than 1:1.2.5、鋼板樁采用重錘錘擊或夯機(jī)錘擊的方式進(jìn)行。鋼板樁頂部應(yīng)高出地平面200mm。Drive the pile by means of punching with heavy punch or punning with punier and the top of the pile should be 200mm higher than the terrace.2.6、鋼板樁必須垂直，嚴(yán)禁鋼板樁向溝槽方向傾斜。The steel plate pile must be vertical and l7、ean towards the trench is forbidden.2.7、相臨的兩塊鋼板樁必須相互正反緊密咬合。The steel plate piles adjacent to each other must tightening bite forward reverse.2.8、由于需要打鋼板樁的距離很長，因此為節(jié)約施工成本，采取分段打樁的方式進(jìn)行。每段大約在50米，共需要鋼板樁220根，總重70噸。樁機(jī)立在需要開挖的溝槽上，沿著溝槽的方向邊打邊退，樁機(jī)下面鋪設(shè)鋼板，鋼板規(guī)格為40002000，=20mm，共計(jì)5塊。We drive the piles by means of sub8、section to reduce the construction cost caused by the long piling distance with each subsection 50m in length and totally 220 steel plate piles in number and 70t in weight .The driving machine stands where the trench should be excavated and retrogrades along the trench with 5 steel plates sized 40009、2000,=20mm under its body. 2.9、當(dāng)一段鋼板樁打完后，立即進(jìn)行土方開挖。將開挖出的泥土堆放到溝槽的另一側(cè)。無法進(jìn)行堆放的泥土需要用運(yùn)輸車運(yùn)到甲方指定的渣土場（距離施工現(xiàn)場9公里）進(jìn)行堆放。Excavate immediately after construction for one subsection is finished and pile the earth excavated out on the other side of the trench ,the remained earth which couldnt be piled should be tra10、nsported to the slag lot(9 km away from the construction site) designated by the client for piling. 3.0、當(dāng)管道安裝完畢試壓合格后，經(jīng)共檢合格，馬上進(jìn)行溝槽回填。回填土需要進(jìn)行壓實(shí)，回填完畢后，方可將鋼板樁拔除。拔除鋼板樁同樣采用震動起重機(jī)，起重機(jī)站在道路上，同時(shí)需要對已經(jīng)鋪設(shè)完畢的路面進(jìn)行保護(hù)，在路面上鋪設(shè)=20mm的鋼板，鋼板規(guī)格為40002000，共計(jì)5塊。Backfill the trench after the pipe erection is finished and qualif11、ied in pressure test as well as the test by all the authorities. the backfilling earth should be compacted and only the backfilling is finished could the steel plate be dismantled by vibration crane standing on the terrace with 5 steel plate sized =20mm ,40002000 under its body to protect the n comp12、leted road.3.1、當(dāng)此段溝槽施工完畢后，方可進(jìn)行下段溝槽施工。溝槽的開挖斷面圖見詳圖1：Only after this section trench is completed could the next trench be constructed ,and the section of excavated trench see detail 1:四、質(zhì)量控制：Quality Control41基坑開挖的日常質(zhì)量監(jiān)督工作由項(xiàng)目部工程部具體負(fù)責(zé)，設(shè)專職質(zhì)量檢查員負(fù)責(zé)日常質(zhì)量監(jiān)督和檢驗(yàn)工作。Quality department of project dept. is responsib13、le for daily quality supervision for base trench excavation. Full time quality inspector shall be designated and responsible for daily quality supervision and inspection.42嚴(yán)格工序交接制度，未經(jīng)檢查或經(jīng)檢查上道工序不合格，嚴(yán)禁進(jìn)行下道工序施工。Execute work procedure handover system strictly; forbid to execute next work procedure strictly if the work is not inspected or the work procedure is unqualified after inspection.五、安全控制：Safety Control51施工人員必須穿戴好防護(hù)用品。依據(jù)JHA對施工班組進(jìn)行安全交底，強(qiáng)化安全意識。The worker should wear PPE correctly. Make safety clarification to workers according to JHA to enhance their safety consciousness.