总结了整体现浇电缆工作井的工作特点和不足,分析采用预制装配式电缆工作井的优势,指出后者亟须解决的关键技术问题和可能的解决办法.针对现有预制电缆工作井专利技术的不足,建议采用混凝土空心板技术,并综述了现浇混凝土空心楼盖的研究与应用现状.通过SAP2000分析了实际电缆工作井的受力状况,用现有混凝土理论按空心井壁进行配筋设计,将其与现浇混凝土实心井壁进行技术经济对比分析后可知:在预制装配式电缆工作井中采用混凝土空心板技术是可行的,可取得节省材料、减轻自重和减少拼装接缝的效益,但空心板在压弯受力状态下的承载力计算理论尚需作进一步的研究.

Used triethanolamine and PVA as a compound modifier to pretreated EPS particle for surface modification,and improved the surface bonding of EPS particles and inorganic cementations materials force by the method of coating inorganic cementing material on EPS surface to build theshell.And through the experiment to compare the relationship between modification methods and the mechanical properties of cement-based materials.

It studied the industrial waste residue finely ground slag and fly ash to replace part of cement,and add the activator activation,through testing to determine the amount of various materials,the final preparation of the strength level in 32.5~42.5 of new slag and fly ash cement-based materials.

Analyzed with specific projects,the approach of foundation piles test was selected according to the engineering geological circumstance which combines application of core drilling method,crosshole sonic logging and low strain integrity testing.Actually the results demonstrated the reliability of the technical advantages and the measures.Practically confirmed it's a reliable and effective method to apply the core drilling method,the crosshole sonic logging and the low strain integrity testing together due to this project,which improves the accuracy of the results indeed.

The axial compressive tests of short steel reinforced concrete columns under different reinforced methods were conducted.Researches on the failure models of hybrid fiber sheets constrained concrete columns and the load-strain curve relationship of steels and concrete were proposed.A comparison on load capacity and ductility was analysed for the mechanical behavior of hybrid fiber sheets constrained concrete columns under different hybrid reinforcing styles besides volumn ratios of hybrid retrofitted amounts.Test results showed that the constraint interaction of hybrid fiber sheets could effectively promote the load capacity of columns and absolutly increase the ductility;when it comes to the specimens more equally strenghened and subjected to 2nd level tensile failure,it turns out a better hybrid effect which indicated the superiority of the hybrid fiber sheets.

For the complicated geographical condition in karst areas, The form of the rational choice c,f foundation is very important. To the author＇ s knowledge, in karst area punching pile is the most effective method of drilling. Through the Pro- ject, from the roof of the stable point of view, On the single pile bearing capacity of karst cave was analyzed, and Construction Technology of hole- drilled bored Dries were summarized.