摘要
大型渡槽槽身设计挠度要求较高，要求对其支撑系统进行预压，测出排架、地基沉降变形，为支撑系统施工设置预拱值提供依据。因渡槽自身荷载大，而且支撑系统预压最大加载是其自身荷载的1．2倍，为保障施工安全和进度，采用半跨和分配梁承重结构预压方式。首先计算出半跨槽身整体荷载（活荷载和恒荷载），然后根据分配梁承重结构形式和三级预压方式，将荷载分解到分配梁上部和下部并对吨袋进行整体布置。另外，对立杆强度、地基承载力和边坡稳定进行了验算，验证整个支撑系统的安全性、可靠性。通过对午河渡槽支撑系统近1个月的预压和观测，测得相关沉降数据，计算出支撑系统的预拱值，实践说明此种预压方式和强度验算是正确的、可行的，为大型渡槽槽身预压又提供了一种方式和思路。
It requires high deflection of design for the large aqueduct and the supporting system should be pre-eompressed. The deformation of subsidence of shelving and foundation should be measured. These are basis for the set of pre-arch value of the supporting system. With large load of the aqueduct, the maximum load of the supporting system is l. 2 times as much as the load of itself. Ensured construction safety and schedule, the half-span pre-compaction and the load bearing structure scheme of distribution beam is adopted. First, the half-span load（live and dead loads） is calculated. Then according to distribution beam bearing structure and three-level scheme, the load is assigned to distribution beam up and down. On the basis of distributed load the ton bags are set by the way of equivalent pre-compaction and the cushions, stands, and foundations are checked. And then the security and reliability of the whole supporting system is checked. By means of pre-compaction and observation on Wu aq- ueduct supporting system about 1- month, the several concerning subsidence data are obtained, and the pre-arch values of the supporting system are obtained as the basis of support system construction. The experience shows that pre^compaction scheme and strength checking is a strategy and an option. That another aspect of scheme and thoughts is taken for the pre-compaction of large aqueduct body.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2013年第B01期99-102,120,共5页
South-to-North Water Transfers and Water Science & Technology
关键词
渡槽
支撑系统
预压
分配梁承重结构
三级
强度验算
预拱值
aqueduct
supporting system
pre-compaction
load bearing structure of distribution beam
three-levels
strength checking
pre-arch value
