厦门帝景苑2 钢结构工程现场焊接专项方案

1、first compliance review of the application of the appraisal committee, only through the compliance review of the application to take part in a detailed review. 8.1 application compliance review: does not meet one of the following conditions, procuratorial agency to submit application through complia

2、nce reviews, be invalidated: (1) application of the formats, contents, meet the requirements of selected files, powers of attorney, declarations by the legal representative and the tender agent application to meet the requirements; (2) licence and a bidding agent qualifications meet the requirements

3、; (3) the similar project tendering agency agent number and provide proof of material compliance; (4) the tendering agency intends to put into this project the number of professionals to meet the requirements; (5) are intended to the agent of the project as a project manager has similar projects the

4、 number of and references to meet the requirements; (6) no fraud case. 8.2 application review in detail the evaluation committee through compliance reviews will be selected for detailed review of the application. 8.2.1 tender agent institutions similar project tender performance requirements (16 poi

5、nts) tender agent institutions similar project tender performance 16 points, by two part composition (1) agent similar project of cumulative bid amount scored calculation rules for: agent water project bid amount (on january 1, 2007 has has bid notice for associate) cumulative each reached 100 milli

6、on yuan have 2 points, water project cumulative bid amount scored up not over 6 points. in addition, completes a bid worth more than 500 million yuan in total 1 minute, but other items score accumulated winning amount up to a maximum of 6 points. (2) calculation rule for the number of agents similar

7、 projects: proxy bid amount (since january 1, 2007 winning notice shall prevail) bidding projects in more than 50 million yuan by 2 points, but the agency projects the number of scores up to 3 minutes. 8.2.2 to be agents of the construction project as a project manager in the same project performanc

8、e (10 points) project manager agent performance scores including agents of the bidding agencies of similar projects, as well as in other similar project tendering agency service agent during performance. total 10 project manager agent performance, made up of two parts (1) acting like the accumulated

9、 winning amount calculation rule: agents for water conservancy project bid amount (since january 1, 2007 winning notice for example) cumulative average reached 100 million yuan 3 but scored no more than 5 minutes. (2) calculation rule for the number of agents similar projects: proxy bid amount (sinc

10、e january 1, 2007 winning notice for example) in the more than 50 million yuan water conservancy project period of 3 minutes, but scores the number of agents similar projects up to a maximum of 5 points. project manager demonstrated to provincial-level and higher people's government or the devel

11、opment and reform commission published the winning bidder on the designated media publicity shall prevail. 8.2.3 staff requirement (25 points) 1, to the construction project serving personnel, 4 years experience in tendering agent, 2 points per person, 2 years experience in tendering agent .pig is n

12、ot a pig. with domestic international market and technology big environment of changes, as china traditional industry of pig production of job way and profit way are requirements related industry for resources integration, to quality security for premise, regulation based farming, and management cos

13、t and the production, and sales cost, go standardization, and scale, and intensive, and market road, fast upgrade whole industry chain of regulation capacity, market competition capacity and anti-risk capacity. first, industry analysis (a) the basic situation in china is a traditional hog production

14、 and consumption country, 2008 46.15 million tons of pork, pig stock 462.64 million head by the end pig slaughter 609.6 million. national pig industry's annual production value at around 650 billion yuan, nearly 50% per cent of annual output value of animal husbandry. sichuan province in 2008 pr

15、oduced 6.52 million tons of pork, with 694,000 tons of chengdu city, live pig sell 10.46 million, first 15 vice-provincial cities in the country. the whole nation advantage regional planning (2008-2015) there are 437 counties (cities), 55, sichuan, chengdu has 7 (including in pengzhou). internationa

16、l pig industry mainly include the european union, the united states, and canada, and brazil and other absolute scale of animal husbandry industry and technology developed countries. market 1, the domestic market from china's meat consumption habits and economic analysis of the development situat

17、ion, the emergence of new trends in the market of domestic pork and its products. docking is a pig production and sales more closely. the yangtze river delta, pearl river delta and the bohai rim economic developed area industrial structure adjustment gathered pace, two or three industries to the cen

18、tral and western bias. second, the rigid domestic consumption growth. for a long period, pork is still the largest variety of meat consumption in china, the absolute consumption continues to grow. especially in the vast rural market growth potential. third, market for pork and higher product quality

19、 requirements. pollution-free pork safety and health has shown a very good market prospects. four is the market changing. currently, cold meat, more and more varieties of meat and pork meat products, which accounted for a large proportion of pork consumption, stores, chain stores, supermarkets and o

20、ther marketing methods is on the rise, and transport has been extended to more than 2000 km in radius. chengdu is an important "river pig" resource market, the city's commercial rate reaches above 60% of live pigs, pork and raw materials primary processing products in the domestic and

21、international reputation is high. western hog trading center in chengdu and provides disease-free areas of construction in order to further accelerate the development of swine industry realizes space and conditions. 2, the international markets at present, annual volume of trade in live pigs in the

22、world year around 18 million, about 6 million tons of pork trade. a large net exporter of pork is mainly the eu and north america,-importing countries mainly in asia, japan, and korea, and singapore, the philippines, hong kong and other countries and regions, as well as russia, about 3 million tonne

23、s were imported. it is predicted that the world meat consumption increase of 80% in asia in the future, our country has obvious geographical advantages, export potential. with the advancement of live pigs superiority industry belt construction, animal disease .帝景苑一期工程 2#楼钢结构工程现场焊接施工方案帝景苑一期工程2#楼钢结构工程

24、现场焊接施工方案江苏沪宁钢机股份有限公司二零一四年四月目 录第一章 工程概况11.1工程概况1第二章 编制依据22.1编制依据2第三章 焊接工程概况33.1焊接工程概况33.2现场焊缝形式43.3现场焊缝质量等级要求4第四章 焊接施工部署54.1劳动力安排54.1.1现场作业焊工资质管理54.2施工机具安排及用途64.3焊接方法64.4焊接施工技术措施74.4.1现场焊接技术特点74.4.2技术准备84.4.3焊接施工顺序124.4.4焊接前技术措施134.5主要节点焊接144.5.1主要节点焊接工艺参数144.5.2方形钢管柱接头焊接要求144.5.3 h型梁-柱接头焊接154.5.4钢板剪

25、力墙焊接顺序164.5.5钢斜撑焊接顺序16第五章 特殊季节施工技术措施175.1高温季节施工技术措施175.2雨季施工技术措施185.3钢结构焊接防风措施19第六章 焊缝质量检验和焊缝质量保证措施206.1焊缝的外观检查206.2焊缝的超声波探伤检查236.3现场焊缝缺陷的返修256.4焊缝质量保证措施26第七章 焊接施工安全生产和防火措施287.1安全教育与培训287.2安全个人防护措施287.3防范火灾措施30第八章 临时用电308.1防范火灾措施308.2安全用电措施318.3施工现场用电管理324.1 application of the chinese language appli

26、cation for proxy bidding agency application system. 4.2 bidding agent applications should be submitted by the agency included in the 5th chapter of the content, and than select file asked to provide appropriate documentation. 4.3 proxy application shall affix its official seal coding and page by pag

27、e in the specified location. agent a copy of the application shall have to number the pages and signed original copy (copy) (including supporting documents), and copy should be exactly the same. 4.4 application there shall be no loose pages. 4.5 agent application should be complete with indelible in

28、k (powdered) prints, the agent shall not alter any page of the application. 4.6 bidding agencies offer should be based on the interim measures for the management of tendering agent's service charges (meter prices 20021980) rules of the nineth, tender agent service charges using the difference pr

29、ogressive billing rate. charges in accordance with the tendering agent's service charges and, in conjunction with the provisions of the specific circumstances of the project shall not be floating up and down-floating range must not exceed 20%, otherwise the application cannot pass compliance che

30、cks, be invalidated. due to bidding agency selection and principal-agent contracts signed during charging base bid amount has not yet been produced, it can only be according to the rates of price, bid and the bid amount determines after the end, controlled response rates calculated shall pay tender

31、fee (tender agency fee accounts for the actual bidding agent item for fares). than the selected person tendering agent's service charge control the upper and lower limits, cap for the state development planning commission of the interim measures for the management of tendering agent's servic

32、e charges (meter prices 20021980) of tendering agent's service fees under 100%, the lower limit for the state development planning commission of the interim measures for the management of tendering agent's service charges (meter prices 20021980) of tendering agent's service fees under 80

33、%. tendering agent's service charge base should include the following tenders: construction, supervision and material over the above tenders are expected to be important, with each tendering agency entrusted with tender bid amount as a base for a separate computation of tendering agent's ser

34、vice fees. tendering agent's service fee payment in accordance with the general office of the state development and reform commission on tendering agent's service charge of notification on the relevant issues (the change price 2003857). sale of prequalification documents and solicitation doc

35、uments going to choose all, pricing should be based on the principle of profit not files, must not violate the relevant provisions in the price department. 4.7 requirements in the form of application proxy application shall be prepared in the 5th chapter of the format. application of various support

36、ing documents should be requested by the selection of files grouped by order. comparison and selection of the bidding agencies must provide supporting documents required by the file; the file you selected does not have the required supporting documents, bidding agency acknowledged the need to provid

37、e, or you can provide. proxy application shall be bound, and page-by-page coded in the order. 5th chapter application format notes: bidding agent .- 33 -第一章 工程概况1.1工程概况厦门帝景苑项目地块位于厦门筼筜湖与大海连接的西堤东南，西侧为湖滨西路，南侧是繁华的湖滨南路，北临厦门岛内景观中心筼筜湖，西临海湾公园，远眺海景，北望狐尾山、仙岳山，南望鼓浪屿、东坪山，景观资源丰富，地理位置优越。厦门帝景苑2#楼为矩形钢管混凝土柱框架钢板混凝土剪力

38、墙结构，楼盖采用型钢梁和钢筋桁架混凝土组合楼板。地下结构三层，地上结构共62层加一层屋顶层，主体结构标高范围-18.200米 244.690米，加顶层构造层结构最高位置标高250.650米。框架巨型钢柱均为箱型截面，剪力墙内部设劲性钢柱和抗剪钢板，钢柱截面最大尺寸为口2500x2500x80，钢梁主要为热轧h型钢和焊接h型钢，其最大规格尺寸为h2000x1500x40x80。厦门帝景苑2号楼整体三维示意图第二章 编制依据2.1编制依据为加强厦门帝景苑项目钢结构工程的现场焊接质量管理、保证钢结构工程质量，根据工程合同文件、施工图纸、相关规范、标准和设计要求，特制订帝景苑一期工程2#楼钢结构工程现

39、场焊接专项施工方案”作为钢结构工程现场焊接工作的指导性文件。1、设计院确认后的深化设计详图2、钢结构设计规范 （gb50017-2003）3、高层民用建筑钢结构技术规程 (jgj99-1998)4、钢结构工程施工质量验收规范 （gb50205-2001）5、建筑工程施工质量验收统一标准 （gb50300-2001）6、建筑钢结构焊接技术规程 （jgj81-2002）7、低合金高强度结构钢 （gb/t1591-1994）8、碳素结构钢 （gb700-1988）9、建筑结构用钢板 （gb/t19879-2005）10、钢结构焊接规范 （gb50661-2011）11、低合金钢药芯焊丝 （gb/t1

40、7493-1998）12、气体保护焊用焊丝 （gb/t14958-1994）13、钢焊缝手工超声波探伤方法和探伤结果分析 （gb11345-1989）14、厚钢板超声波检验方法 （gb/t2970-2004）15、涂装前钢材表面锈蚀等级和除锈等级 （gb8923-1988）第三章 焊接工程概况3.1焊接工程概况本工程2号楼为矩形钢管混凝土柱框架钢板混凝土剪力墙，楼盖采用型钢梁和钢筋桁架混凝土组合楼板。主要构件形式有：1、钢柱截面最大尺寸为口2500x2500x80；2、钢梁主要为热轧h型钢和焊接h型钢，其最大规格尺寸为h2000x1500x40x80；3、剪力墙钢板最大厚度为45mm。本工程主

41、要材质为:构件部位钢材材质矩形钢管混凝土柱、矩形钢管柱、框架梁。钢桁架、钢板剪力墙、普通支撑 钢板厚35及以下q235b,q345b钢板厚>35q345gjb,q390gjb承载型屈曲约束支撑芯材q345gjb,q390gjb耗能型屈曲约束支撑芯材q160b,q100b3.2现场焊缝形式本工程钢结构施工现场焊接连接的形式主要有：（1）方形钢管柱对接采用刚性连接-横焊（h）（2）方形钢管柱-h型钢梁牛腿平角焊（f）（3）h型钢梁翼缘与方形钢管柱牛腿翼缘刚性连接平焊（f）（4）h型钢梁腹板与方形钢管柱牛腿腹板刚性连接立焊（v）（5）h型钢梁腹板与剪力墙连接板的刚性连接立焊（v）（6）h型钢梁

42、连接板与剪力墙埋件刚性连接立焊（v）（7）h型钢梁腹板连接板与钢柱刚性连接-立焊（v）（8）方形钢管柱牛腿与箱型钢斜撑刚性连接-横焊（h）立焊（v）（9）钢梁牛腿与箱型钢斜撑刚性连接-横焊（h）仰焊（o）（10）x型钢斜撑牛腿与斜撑之间的刚性连接-横焊（h）立焊（v）仰焊（o）(11) 方形钢管柱间箱型钢斜撑刚性连接-横焊（h）立焊（v）仰焊（o）（12）隅撑与钢梁连接板角接焊缝。3.3现场焊缝质量等级要求按照设计说明：对接全熔透焊缝质量等级为一级，部分熔透焊缝质量等级为二级，角焊缝质量等级为三级，按照gb50205-2001的要求，对现场焊缝应进行探伤和外观缺陷检查。焊缝质量等级为一级时超声

43、波探伤比例为100%，二级时为20%，三级时可不进行超声波探伤。 探伤比例对现场安装焊缝按同一类型、同一施焊条件的焊缝条数计算百分比，探伤长度不小于200mm，并应不小于一条焊缝。当超声波探伤不能对缺陷作出判断时，应采用射线探伤，其内部缺陷分级及探伤方法应符合钢焊缝手工超声波探伤方法和探伤结果分级法gb11345或钢熔化焊对接接头射线照相和质量分级gb3323的规定。 焊缝表面不得有裂纹、焊瘤等缺陷；一级、二级焊缝不得有表面气孔、夹渣、弧坑裂纹、电弧擦伤等缺陷；且一级焊缝不得有咬边、未焊满、根部收缩等缺陷。第四章 焊接施工部署4.1劳动力安排现场各月份高峰期施工用人数工种类别现场安装阶段201

44、4.42014.5-2014.62014.7- 2014.92014.10- 2014.122015.1- 2015.32015.4- 2015.72015.8- 2015.11电焊工5202030353525起重工2666886装配工15202050606050测量2222222无损探伤1111111总计25494989106106844.1.1现场作业焊工资质管理按照jgj81-2002建筑钢结构焊接规程“焊工考试”的规定，参与钢结构工程现场焊接的操作工人，必须是有一定焊接经验的成熟焊工，并持有有效的焊工操作证，经过验证合格，方可正式上岗，并只能从事与其焊工证规定范围内的焊接操作项目。针对

45、本工程主要重要部位钢结构焊接接头的特点，需对参与焊接人员进行专门培训和提高性培训，以达到熟悉焊接工艺操作规程和提高焊接技能水平，保证工程焊接质量等级达到优良。1） 资质要求参与钢结构工程现场拼装和安装的焊接工人，必须有一定焊接经验的成熟焊工，且持有冶金、化工、电力、船舶、压力容器等五种焊工操作证之一，并在有效期之内。2 ）进场试焊进入现场的焊工，在正式上岗焊接之前，必须进行进场试焊。试焊前先检查焊接的电气系统。进场试焊的目的是：（1）培训焊工的适应能力；（2）检验焊接系统工作的可靠性（包括焊接设备、焊材及供电电压的稳定性）。3） 焊工证件管理正式参与钢结构现场焊接操作的焊工，须将焊工名单统计汇

46、总，主要包括焊工姓名、年龄、焊工证编号、焊接项目等内容。并将焊工有关资质证书的复印件进行备案。所有参与钢结构现场焊接操作的焊工，均须持有上岗证，在焊接操作过程中接受监理单位抽查，检查焊工是否持证上岗和所操作的项目是否与其资质相符4.2施工机具安排及用途机具设备序号品名单位数量用途1角向磨光机台10焊缝打磨2氧气、乙炔工具套8焊缝修整及预热等3直流电焊机台15点焊、加固4co2气体保护焊机台20焊接5碳弧气刨机套2焊接返修6烘箱台1烘烤焊条7空气压缩机台2气刨供气8焊条保温桶只30焊条保温9超声波探伤仪台1焊接检验4.3焊接方法首先考虑等强原则，另一方面考虑高空焊接时风速大，要求焊接时有抗风性能

47、以及高效的焊接方法。抗风性好的焊接方法有手工电弧焊和自保护药芯半自动焊，但此两种方法各有各的长处，现对比如下：性能手工电弧焊自保护药芯焊抗风性能好好*操作灵活，作业范围大基本固定，作业范围小电弧能量分散集中电流密度小大熔敷速度11.5熔深小大热影响区大小应力和变形大小生产率13-4根据现场焊接特点，并结合工程实际，拟采用co2药心焊丝气体保护焊接为主，辅以手工电弧焊等方法。选用co2药心焊丝气体保护焊，第一：是熔敷速度高，其熔敷速度为手工焊条的23倍，熔敷效率可达90以上；第二：是气渣联合保护，电弧稳定、飞溅少、脱渣易、焊道成型美观；第三：对电流、电压的适应范围广，焊接条件设定较为容易。对这种

48、结构外露型构件的焊接比较适宜。因此，本工程钢框架的焊接将主要采用co2药心焊丝气体保护焊。同时由于手工电弧焊简便灵活，适应性强，仅作为辅助加固用焊接方法。4.4焊接施工技术措施4.4.1现场焊接技术特点（1）构件的截面和板厚大，焊缝的填充量大，多层多道手工现场焊接，容易产生焊道和层间未熔合、夹渣等缺陷以及翼缘的角变形。（2）钢柱对接为横焊位置，施焊难度较大，应严格按要求进行，确保安全。（3）钢柱对接焊接时应采取必要措施减缓焊缝冷却速度，减少焊缝收缩应力及构件拘束度。（4）钢柱拼接时对接口截面错边、柱轴心偏移和垂直度的偏差应满足钢结构工程施工质量验收规范gb502052001及高层民用建筑钢技术

49、规程jgj9998标准所规定的各项要求。多层及高层钢结构中构件安装的允许偏差（mm）项 目允许偏差检验方法上、下柱连接处的错口3.0直角钢尺柱子定位轴线1.0全站仪单节柱的垂直度h/1000，且不应大于10.0经纬仪、全站仪4.4.2技术准备（1）根据图纸要求及施工规范和技术标准，对所有持证焊工进行技术交底和岗前技术培训。（2）焊材的选择：根据图纸要求，焊接材料采用氢含量较低的焊材。焊接材料的选用原则与母材强度等强。选用如下焊条：焊材的选配屈服强度级别手工焊条型号co2气体保护焊实芯焊丝型号埋弧焊焊接材料（焊剂+焊丝）q235be4315er50-6f4a0+h08aq345b/q345gjb

50、e5015er50-2f5024+h10mn2q390gjbe5015er50-2f5024+h10mn2保护气体为co2，纯度99.98（露点-40）。(3)焊材的保管与使用现场焊接材料库为二级仓库，焊接材料的保管与使用严格按本单位质量保证体系进行全过程的管理与控制，工程部和质量部是焊接材料库的管理部门。焊接材料的保管与使用须按如下要求进行：a、验收焊接材料库建立物资验收记录表，由材料员及库管员共同进行验收，写明焊材进场日期、牌号、规格、产地、质保书号等，材料员应与发运清单中焊材牌号、规格、产地对照检查，并随机开包检查。焊接材料使用前应仔细检查，凡发现有药皮脱落、污损、变质、吸湿和生锈的焊条

51、不得使用。焊条的中心度偏差应小于0.5mm，包装箱、塑料袋应完好无损。焊丝表面不能有锈蚀、镀层脱落等缺陷。b、复验公司根据钢结构工程施工质量验收规范（gb50205-2001）中相关要求进行厂内焊材复试，焊材复试为见证取样、送样检验，材料员及取样员在材料进场后应根据不同批号、规格，请监理单位见证员共同取样、送样。复验结果合格的材料，方可进入合格品区。若现场监理要求进行现场焊材抽检，则步骤同上。c、 保管1）焊接材料库由厂内已复验合格的焊材送至现场库存。2）所有库房内要通风良好，保持干燥，库内要放置温度计及干湿度计。保管员必须每天上班后观察记录库内温度、湿度，使库内温、湿度达到规定标准（相对湿度

52、不大于60）。3）焊条、焊丝、焊剂搬运堆放时不得乱摔、乱砸，应注意轻放。不准拆散焊材原始包装，以防散包混杂。焊材存放在专用的货架上，货架离地面、墙均在300mm 以上。焊材库内所有焊材必须按其品种、规格、牌号等分类存放在货架上，并有明显标牌以示区别。4）所有库房根据日领计划烘烤及发放。d、 发放现场焊接材料库建立焊材发放台帐，焊工领用应签字记账，根据焊材预算量领料。发料时严格按工艺要求、预算、规格、牌号、数量发放，不得超领、超发。发出时仓库保管员应填写焊材发放记录，注明规格、牌号、数量、批号、检验合格情况等，发给领用部门。发料时应按焊材出厂日期的先后发放，以防存久变质。e、 领用1）焊工作为使

53、用人，应根据工程结构对应施焊接头的母材材质和工艺规定，从焊接材料库领取合格的焊材。2）焊工持保温筒领取焊条，焊接过程中必须盖好保温筒盖，随用随取，严禁焊材外露受潮，如发现焊材受潮，须立即回库重新烘焙(焊条烘干次数不宜超过2 次)。3）施焊人员每次领取的碱性焊条数量不得超过4 小时的用量，酸性焊条不能超过一天的用量，用不完的焊条应当天交回库房，回收的焊条要在“焊条回收、从新烘干与发放纪录表”上进行登记。回收的焊条重新烘干次数碱性焊条不得超过一次，酸性焊条不能超过两次。f、烘焙和储存焊条在使用前应按材料说明书规定的温度和时间要求进行烘焙和储存。低氢型焊条经烘焙后领用前要转入保温箱储存。（4）焊接及

54、相关设备1）焊机焊接设备应符合相应的现行国家标准，安全防护装置齐全。所有焊接设备（包括加热、测量、控制装置）应处于正常状态，仪表均应经过鉴定，并在有效期内。焊接电源必须有独立而容量足够的保护装置，如自动断路装置等。保护装置应能可靠地切断设备最大额定电流，以保证安全。焊接设备的各接触点和连接件必须连接牢固，在运行中不松动和脱落。焊接设备应有保护接地或保护接零线。保护接地或保护接零线中间不得有接头。焊机应放置在干燥、通风良好的地方，并避免剧烈的振动和碰撞。焊机应保护良好的绝缘，经常清扫、保持干净。2）辅助机具焊钳、焊枪应有良好的绝缘性能和隔热性能。焊钳、焊枪与电缆连接处必须简便牢固、接触良好。且连

55、接处不得外露，以防触电。焊接电缆应有良好和足够的导电截面和绝缘层。焊接电缆线应为多股细线组成的软线。且应具有较好的抗机械性损伤能力及耐油、耐热和耐腐蚀等性能。焊机与配电盘连接的电源线长度不超过3m。严禁将电源线拖在工作现场地面上。焊接电缆中间不应有接头。如需短线连接则接头不宜超过2个，接头应用紫铜导体制成，并且连接要牢靠，绝缘要良好。严禁利用现场的金属结构、管道、轨道、爬梯及其他金属物搭接起来作为导线。电缆不可置于电弧或炽热焊件附近，以防烫坏绝缘层。横穿现场通道或道路时要加遮盖保护，以防辗压磨损。通过焊接电缆的电流不得超过电缆线的安全载流量。 电加热器等预热设备布设应由专业电工负责，不得有裸露

56、的电阻丝或导线。3）焊机棚要求焊机棚要求有防雨、防涝，保持干燥、通风良好，机棚地面为高于自然地坪200mm架空地面，要求有足够的承载力，四周支撑为型钢或钢管柱。同时还具有防盗功能，顶棚应有一定强度，防止高空落物。焊机地线要有一定截面的槽钢作为连接导线，在型钢上设置导线螺栓，并按焊机工作范围分别引出各自地线，同工件连接。焊机棚必须美观简洁实用，外观基本统一。现场焊机棚根据需要分为移动式、固定式两种。 移动式焊机棚结构承载能力要满足吊运的需要。吊运时，焊机要固定，以防滑动、碰撞。4）焊接安全保护措施根据现场实际情况，制作便于拆装且使用安全的柱-柱接头焊接平台，柱-梁及梁-梁接头焊接用吊篮。见下图示意：柱-柱焊接平台 梁-梁接头吊篮5）焊接准备