across back是什么意思

用法例句

The supporting and back structures are important temporary structures in jacking construction of bridges and culverts, and are of great importance in ensuring smooth construction and guaranteeing the time limit for a project.

支护和后背是桥涵顶进施工中重要的临时结构,对施工顺利与否、保证工期起着关键的作用。

In this paper,In case of the Three Gorges Project,the finite element model of the penstock downstream of dam with cushion course is built by using the software of ANSYS;the stress state of penstock is calculated and analyzed.

以三峡水电站坝后背管为例,借助有限元软件ANSYS建立了设置软垫层坝后背管有限元模型,计算分析了设置软垫层坝后背管结构应力状态,并与结构模型试验对比。

It also reduced the trouble for construction incurred by the use of original soil as backing,and thus accelerating the schedule in construction of the project.

　结合常州地区供水一期工程介绍了大口径钢筒预应力混凝土管的中间试压技术,它克服了长距离输送管道因试压需间断施工的弊端,使管道间断施工变成连续施工,并减少了预留原土后背给施工造成的麻烦,加快了工程施工进度。

Application of the elasticity center method of structure mechanics for penstock laid on the downstream face of dam;

坝后背管结构力学弹性中心法的应用