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10秒装修报价 装修要花多少钱?获得精准报价,省钱30%
168211
元
材料费:77201元
人工费:86544元
设计费:1760元
质检费:2706元
(1)无吊车时柱间支撑的间距宜取30~45m;当有吊车时宜设设在温度区段中部,或当温度区段较长时宜设在三分点处,且间距不宜大于60m; (2)当建筑物宽度大于60m时,内柱列宜适当增加柱间支撑; (3)支撑与构件的夹角应在30°~60°范围内,宜接近45°; (4)柱间支撑可采用带张紧装置的十字交叉圆钢支撑,当桥式吊车起重量大于5t时,宜采用型钢支撑; (5)柱间支撑的内力,应根据该柱列所受纵向荷载(如风、吊车制动力)按支承于柱脚基础上的竖向悬臂桁架计算; (6)对于交叉支撑可不计压杆的受力。当同一柱列设有多道柱间支撑时,纵向力在支撑间可按均匀分布考虑; (7)在每一伸缩缝区段,沿每一纵向柱列均应设置柱间垂直支撑。
用门式钢管脚手架搭设的模板支撑架,由于各层门架之间为平接,使得由多层单列门架构成的支架的横向(门架平面方向)刚度较差。在支架较高且无连墙撑设置时,较易产生过大的侧向变形(大波鼓曲失稳),使其承载能力显著降低。而门式钢管脚手架的稳定性计算取门架立杆的计算长度系数为1,即,,(I0、A1和h1、I1分别为门架立杆的毛截面惯性矩和毛截面积与加强杆的高度和毛截面积),当取k=1.17,h0和i分别取1.93m和1.525cm(立杆为φ42×2.5)与1.90m和1.652(立杆为φ48×3.5)时,其λ、φ和Rd分别为148、0.316、20.08kN和135、0.371、37.19kN,后者大致相当于表5-93所列μ‘h=1.8的4m高普碳钢管支架立杆的稳定承载力(Rd=37.2),而该表μ‘h=1.92的Rd为33.3,仅为其90%。为安全起见,将门式钢管脚手架的稳定承载能力乘以0.9的降低系数作为门式钢管支撑架的稳定承载力设计值。
1)支架的步距h应不大于1.8m,立杆的纵距la和横距lb应不大于1.5m,且h/la和h/lb必须≥1.0;2)支架立杆在顶层横杆之上的伸出长度a≤0.5(μ1w-1) h,且应尽量减小;3)双排支架的两个长向外侧面和多排(3排以上)支架的四周外侧面均应设置不少于占其1/3框格的节点斜杆;4)各层横杆和扫地杆必须双向满设。
1)受压杆件稳定性验算(包括支柱、单肢立杆和支架整体稳定性,其中支架的整体稳定性一般都转化为对其长度为步距h的立杆段的稳定性验算);2)直接承受模板荷载并将其传给立杆的水平杆件和构造(组合梁、桁架梁等)及其连接件的验算(承压、受弯、受弯以及扣件抗滑等);3)支座、基础和地基验算。
(1)设计计算要求如下:1)受压杆件稳定性验算(包括支柱、单肢立杆和支架整体稳定性,其中支架的整体稳定性一般都转化为对其长度为步距h的立杆段的稳定性验算);2)直接承受模板荷载并将其传给立杆的水平杆件和构造(组合梁、桁架梁等)及其连接件的验算(承压、受弯、受弯以及扣件抗滑等);3)支座、基础和地基验算。(2)荷载计算梁、板和梁板模板支架参与计算的荷载项及其取值见表5-85。 (3)设计计算要求总的要求为:构造合理、受力明确、荷载算够、验算合格。其中应特别注意以下几点:1)模板荷载的作用点应尽量布置在立杆之上(通过使用立杆顶托撑或其他构造措施)或尽量靠近立杆,以消除或减小偏心作用;2)强度和稳定验算,应分别达到相当于单一系数法设计中安全系数K≥1.5和K≥2.0的要求;3)立杆的基础(地)应有足够的承载能力,且在受载后不得出现超过10mm(或设计限定值)的沉降。基地的楼板时,其下应视需要设置支撑;4)支架的结构和构造中不得出现低于验算条件的薄弱部位。否则,应按薄弱部位(即最不利受力条件)的荷载和构造参数进行验算;5)确保节点构造、斜杆和其他整体性、加强性杆件的设置符合设计要求,使支架具有稳定的结构;6)严格控制和确保施工中的实施荷载及其分布不超过设计值。