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双层钢网架整体提升施工中“离地”控制
梁恒越 1, 韩少龙 1, 乔 锋 1, 宋艳 玥 2
(1. 中信建设有限责任公司,100020,北京;2. 中咨工程管理咨询有限公司,100048,北京)
摘 要: 某大型厂房项目屋面结构为大跨度连跨双层正放四角锥屋面钢网架结构(以下简称屋面双层钢
网架结构),主要对“分区不等位整体多段提升”步骤中“分区网架整体离地”控制的步骤、方法进行描述,
此过程是屋面双层钢网架受力状态变化最大的步骤,亦是提升设备、提升路径等受力状态变化最大的步骤,
该步骤是整体施工中风险最大分控项之一,结合已确定提升工况模型,经计算机仿真模拟分析,确定各提升
点阶段性加载数值,拟定“脱胎”“离地”数值,设定、确立从“提升应力控制”到“提升位移控制”的控
制方法,最终在确保结构安全和整体施工安全的前提下实现“分区网架整体离地”的工况,使得下一步施工
顺利进行。
关键词: 大跨度连跨屋面双层钢网架结构;整体提升;脱胎 –离地 –悬停;提升应力控制 –提升位移
控制
中图分类号:TU 74 文献标志码:A 文章编号:1000–4726(2022)10–1358–05
GROUND LIFTING CONTROL OF DOUBLE-LAYER STEEL GRID INTEGRAL
LIFTING CONSTRUCTION
LIANG H eng-yue 1, HAN S hao-long 1, QIAO F eng 1, SONG Y an-yue 2
(1.CITIC Construction Co., Ltd., 100020, Beijing, China; 2.CIECC Engineering Managerment Consulting Co., Ltd., 100048, Beijing, China.)
Abstract: The roof structure of a large plant project is wide and multi-span double-layer square
pyramid roof steel grid structure (shortened as roof double-layer grid structure). This paper mainly
described the steps and method for divided grid integral lifting control during divided uneven integral
lifting construction. This is a construction step where the roof double-layer grid, lifting equipment
and lifting route have the maximum force variation, and it is also one of the control points having
the highest construction risk. Based on determined lifting model and simulative analysis, this paper
determined periodical loading value of each lifting point to simulate the releasing and lifting values,
to set and determine the control method from lifting stress control to lifting displacement control.
Structural safety and construction safety were guaranteed and the divided integral lifting was finally
realized, ensuring smooth construction of following steps..
Keywords: large-span continuous-span roof double-layer steel grid structure ; overall improvement;
reborn-off the ground-hover; lift stress control-lift displacement control
1 工程概况及施工方法概述
1.1 工程概况
某大型单层工业厂房项目单体建筑面积
4.1万m 2,用钢量 1.7万t,厂房外边总长度 322 m,
宽度130 m,高度 55 m,主体结构为钢管混凝土格构
柱钢排架结构,屋面结构为双层腹杆正放四角锥螺栓
球钢网架结构(以下简称屋面双层钢网架),其中,
主体结构在长边中心位置设置沉降缝,故屋面结构随
主体结构进行分缝处理,结构三维轴测图如图 1所示。
屋面双层钢网架为双层螺栓球钢网架,共两片,单片
沉降缝
屋面双层钢网架
钢管混凝土格构柱钢排架
130 m 322 m
1
27
C
D
E
图 1 结构三维轴
双层钢网架整体提升施工中“离地”控制(论文).pdf