2020欧洲杯直播时间

工程案例

网架结构

2019-07-22 14:58:52
  • 地点:宜昌
  • 面积:500平方米
  • 价格:450
  • 结构:钢结构网架

作为施工的依据,在施工过程中进行的一系列测量工作,衔接和指导各工序的施工,它贯穿于整个钢结构施工过程,是钢结构2020欧洲杯直播时间施工的关键技术工作之一。通过高精度的测量和校正使得钢构件安装到设计位置上,满足绝对精度的要求,因此测量控制是保证钢结构安装质量以及工程进度的关键工序。


1、设计所提供的每个施工节段的相应标高,一般是基于某种标准气温下的设计值,而大型结构往往跨季节、跨昼夜施工。温度变化,特别是日照温差的变化对于结构变形的影响是复杂的,将温差变化所引起的结构变形从实测变形值中分离出来相当困难。因此,应尽量选择温度变化小的时机进行测量,力求将温度、日照对施工控制的影响降低到最小限度。对一些大型结构温度影响的测试表明,在气候条件最不利的夏季,凌晨日出之前及太阳落山后的气温较均匀,且最接近季节平均气温,是测量的较好时机。目前,温度对大型结构控制的影响很难精确地描述。

2在大型结构的施工控制中,温度影响可以分为两种:一种是昼夜温差的影响,另一种是季节温差的影响。无论是昼夜温差还是季节温差对桁架标高控制均有较大影响。


3昼夜温差的影响一般在标高控制中多采用回避的做法,即对标高起控制作用的施工工序,均要求在温度较均匀的凌晨日出前进行。但遇连续高温的天气情况,由于凌晨的温度仍难均匀,温度的影响难以完全避免,在此情况下,宜采用标高的修正公式来减少日照温差的影响。

4季节温差的影响,应设定一个标准温度,将施工过程中实际季节温差对结构的影响在施工控制计算中考虑。

  3.4 CELIANGFANGANDENIDING

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2020欧洲杯直播时间  4.2 ZONGBAOKONGZHIWANGDEFUHE

2020欧洲杯直播时间  4.3 PINGMIANKONGZHIWANGDEBUSHE

2020欧洲杯直播时间  4.3.1 PINGMIANKONGZHIWANGDECENGJIGUANXI


  4.4.2 PINGMIANKONGZHIWANGDEJUTISHICEBANFA

2020欧洲杯直播时间  (1)IJIHEⅡJIKONGZHIWANGCAIYONGYIJIDAOXIANDEJINGDUYAOQIUSHICE,ZHUNQUEJISUANCHUDAOXIANCHENGGUO,JINXINGJINGDUFENXIHEKONGZHIDIANDIANWEIWUCHA。

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2020欧洲杯直播时间   

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2020欧洲杯直播时间   

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2020欧洲杯直播时间  5.3 SHUIZHUNCELIANGDEJINGDUYAOQIU

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  5.4 SHUIZHUNCELIANGZUNXUNYUANZE

  在进行水准测量时,为了减小误差,采取一定的措施减弱其影响,以提高测量成果的精度。同时避免在测量成果中存在错误,因此在进行水准测量时,应注意以下各点序号遵循原则


1观测前对所用仪器和工具,必须认真进行检验和校正;

2在野外测量过程中,水准仪及水准尺应尽量安置在坚实的地面上。三脚架和尺垫要踩实,以防仪器和尺子下沉;前、后视距离应尽量相等,以消除视准轴不平行水准管轴的误差和地球曲率与大气折光的影响;

3前、后视距离不宜太长,一般不要超过100m。视线高度应使上、中、下三丝都能在水准尺上读数,以减少大气折光影响;

4水准尺必须扶直不得倾斜。使用过程中,要经常检查和清除尺底泥土。塔尺衔接处要卡住,防止二、三节塔尺下滑;

2020欧洲杯直播时间  

5完数后应再次检查气泡是否仍然吻合,否则应重读;

 

6记录员要复诵读数,以便核对。记录要整洁、清楚端正。如果有错,不能用橡皮擦去而应在改正处划一横,在旁边注上改正后的数字

7在烈日下作业要撑伞遮住阳光避免气泡因受热不均而影响其稳定性。

2020欧洲杯直播时间  6YUMAIJIANDECELIANGDINGWEI

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2020欧洲杯直播时间  (2)QUANZHANYIZUOBIAODINGWEIFA

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  YISHANGLIANGZHONGDINGWEIFACESHEDEYUMAIJIANZHOUXIANPIANYILIANGYUNXUZHIWEI2.0mm。

2020欧洲杯直播时间  6.2 YUMAIJIANDEBIAOGAOKONGZHI

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2020欧洲杯直播时间  7.1 DAJUYUANQIONGDINGANZHUANGCELIANGJIANKONG

2020欧洲杯直播时间  7.2 HUABANJIEGOUANZHUANGCELIANGJIANKONG

  7.3 HUABANJIEGOUANZHUANGCELIANGJIANKONG