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电动爬架整体提升大模板施工技术分析
[来源:www.futejixie.com] [作者:aoutmy] [日期:17-04-10]

某市超高层电信枢纽大楼工程框剪结构,总建筑面积33400 m2,地下二层,地上十八层。层高4.5m,总高84m.主体框架及剪力墙采用导轨式电动整体爬架(模)体系,剪力墙施工使用电动爬架带动钢制大模板整体同步提升,施工先进,效果良好。“导轨式电动整体外爬架(爬模) 施工技术”评为省级工法,此项工程批准为全国建筑业新技术推广应用示范工程,2005年由建设部组织专家组验收通过。   一、超高层框剪结构导轨式电动整体爬架、爬模   1)方案特点:   超高层框剪结构如按常规采用搭设双排脚手架或三角架支撑系统作为工作面支设大模板,这些方法效率低,安全性差,劳动强度高,为了解决这一问题我们采用了导轨式电动整体提升爬模工艺,以附墙导轨为依托,架体上悬挂可调大模板,电动同步升降。此技术整体性好,安全可靠,劳动强度低,工效高,   ①同一附着点多层多点附墙,保证整体牢靠稳定。   ②具备防外倾及导向功能,整体受环境因素影响小。   ③爬架一次安装,多次进行循环升降,操作简单,工效高,速度快,成本低。   ④按施工流水段进行分段分单元升降,以便于流水交叉作业。   ⑤爬模架体能够悬吊大模板同步爬升,(无须用塔吊吊装大模板),利用手动葫芦悬挂大模板便于大模板合模及拆模;利用大模板水平旋转支撑,便于临时找正加固。   2)工艺原理   在建筑结构四周分布爬升机构,附着装置安装于建筑结构上,架体利用导轮组攀附安装于附着装置的导轨外侧,电动葫芦通过提升挂座固定安装在导轨上,提升钢丝绳悬吊住提升滑轮组件,实现架体依靠导轮组沿导轨上下相对运动,架体上部设悬挑支架及升降手动设备悬挂大模板,调整大模板左右、上下空间位置,用于支模、拆模。   3)爬架组装工艺设计要点   ①平面设计:考虑爬架(模)整体平面,主框架水平分段、分块的布局,预埋点及导轨的平面位置,爬架内排立杆离墙距离,立杆距离。   ②立面设计:主要考虑立面整体高度,主框架及架体的竖向尺寸及分层步数,卸荷点及绳索连接点构造及尺寸,导轨的加强支撑构造,导轨附墙与架体的连结构造,架体悬挂大模板在施工中的安拆空间尺度要求。   ③安全防护设计:每层脚手板铺设,平网、立网的整体全封闭围护,靠墙翻板构造节点,与墙体间隙的防护及防火防触电。   ④预留预埋设计:主要考虑预留孔预埋件的平面位置及立面标高的确定和控制方法。   ⑤电气设计:主要考虑架体整体同步和分段、分块单体调节升降控制线路,总控制台及分控点传感及通讯,以及防雷安全接地等。   4)工艺流程分(1)爬架初爬升流程,(2)大模板施工工艺流程   5)施工速度:   爬架可分段升(降)其高差不得超过一层。升降速度90mm/min,一般整个楼层每升(降)一层用时2.5h左右。   6)技术经济分析   ①技术分析   电动整体提升爬模施工效率高,劳动强度低。和扣件式钢管脚手架相比,生产效率提高200%以上(提升速度90mm/min),劳动强度降低2/3以上;比悬挑脚手架和附着式三角架施工生产效率提高50%以上,劳动强度降低了1/2以上。经过五个月的施工,顺利结顶,缩短工期2个月,无任何安全事故.   One tall telecom hub building engineering frame shear structure, a total construction area of 33400 m2, underground 2, 18 floor on the ground. The height of 4.5 m, the total is 84 m. high body frame and shear wall using guide rail type electric integrated climb (die) system, shear wall construction using electric drive steel template as synchronous upgrade, climb the construction is advanced, the effect is good. "Outside the guide rail type electric integrated frame (climbing form construction technology of" provincial method, the project approved by the national construction industry new technology application demonstration projects, 2005 by the ministry of construction organization expert group acceptance through. A guide rail, high-rise frame shear structure type electric integrated climb, climb mould features: 1) tall frame shear structure such as conventional set-up double-row scaffold or using a tripod as for working face big template support system, the method is of low efficiency and poor safety, high labor intensity, in order to solve this problem we have adopted the ascent climbing form guide rail type electric technology, based on attached guide, body hang adjustable template, lifting electric synchronization. This technology integral sex is good, safe and reliable, low labor intensity, work efficiency is high, the multilayer more attached to the wall (1) the same attachment points, guarantee the stability of the overall firm. (2) have and extraversion, and guide function, the overall small by environmental factor influence. (3) to climb a installation cycle several times, simple operation, high efficiency, fast speed, low cost. (4) according to the construction unit lifting water period of segment points, so that the water crossover operation. (5) climbing formwork synchronous climb to suspension template, (no need to use crane hoisting large template), using manual gourds hanging big template to the template clamping and dismantle; Using large template level rotational support, facilitate temporary find is reinforced. 2) process principle Climb around the building structure distribution agencies, attachment of installation on the building structure, frame body use the idler pulley group clings to install in the attachment of guide rail lateral, electric hoist through ascension fixed hanging seat is installed on the guide rail, the hoisting cable suspension live ascension block and tackle, realize on the rack body relative movement up and down the guide rail, idler pulley group upper frame body set cantilever bracket and manual lifting equipment hung big template, adjust around big template, the space position, used in the mold, mold. 3) climb frame assembly process design key points (1) the plane design: consider climbing frame (die) integral plane, the layout of the main frame of horizontal section, block, embedded point and guide plane position, climbing frame in vertical pole distance away from the wall, vertical pole distance. (2) the facade design, main consideration facade overall height, the vertical dimension of the main frame and the frame body and stratified steps, unloading point and rope connection structure and size, the strengthening of guide rail support structure, guide rail links attached to the wall and the frame body structure, the frame body suspension and dismantling of large formwork in the construction of the space dimension requirement. (3) safety protection design: each floor planks laid, flat screen, set net overall closed enclosure, node structure, turning against the wall and wall body clearance protection and fire prevention of electric shock. (4) the reserved embedded design: the main consideration the reserved hole embedded parts of plane position and control method of determining elevation and facade. (5) electrical design, main consideration frame synchronization and whole body block, block monomer adjust elevator control circuit, general control and sensing and communication control points, and lightning protection grounding safety. 4) process (1) at the beginning of the climb climb process, (2) the big template construction process 5) speed: climb to rise (fall) into the elevation difference shall not be more than one layer. Lifting speed is 90 mm/min, generally the whole floor per liter (down) a layer of about 2.5 h. 6) technical and economic analysis (1) technical analysis electric overall increase climbing form construction of high efficiency and low labor intensity. Compared with the fastener type steel pipe scaffold, improve production efficiency by more than 200% (90 mm/min speed), labor intensity is reduced by more than two-thirds; Than the cantilever scaffold and the attached type tripod construction to improve production efficiency by more than 50%, labor intensity decreased more than 1/2. After five months of the project construction, roof, shorten the construction period, 2 months without any safety accidents.

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