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GFRP bars and PC strand composite pile is a new supporting piles, according to the engineering field test and analysis of experimental data prove that there is a significant effect on the control aspects of the horizontal displacement of supporting piles. Principle energy method can calculate the horizontal displacement of pile foundation pit in theory, by comparing the size of the horizontal displacement of the supporting piles of ordinary reinforcement, to demonstrate the feasibility of using GFRP bars and PC strand combination of techniques to reduce the horizontal displacement of excavation, provide reference for future engineering practice.

Concrete cover thinkness of GFRP to ensure the safety, applicability and durability of the structure is of great significance. Based on studies to 30 the drawing specimens of concrete ,get bond strength of same GFRP diameter,same concrete strength, different concrete cover thinkness. Through the analysis of test data,it is concluded the relationship of the bond strength and the concrete cover thinkness.And basis on the relationship,it is determine the suggestive values on concrete cover thinkness of GFRP.Experimental data and suggestion can provide reference and theoretical basis for the GFRP engineering application and the establishment of the relevant specification.

GFRP bars pile as supporting structures for application in foundation engineering, the construction process of molding and banding quality directly affects the safety of the structure, ease of construction and appearance quality. Through practice on multiple projects, worked out a more mature construction process, better control of the quality of construction projects GFRP bars, standardized operating procedures.

GFRP bars and PC strand combination pile that is configuration GFRP bars in the compression zone of the general pile, in the tension zone configuration PC strand. Pile construction is completed and before the excavation, applied partially prestressed for the tension zone of PC strand, so that GFRP bars in tension, with the excavation pit, GFRP bars tendons pulling force gradually reduced; When the excavation to a certain depth, the second prestressed steel strand so until the excavation is completed. In summary, the technology features is GFRP bars, concrete piles, PC strand all in tension. This makes full use of the concrete compression performance, GFRP bars and PC strand tensile good performance characteristics.

Half-screwed pile is a new kind of pile. Because of the unique design of variable cross-section, bearing principle and working traits are much more complex than the traditional linear pile. The vertical load transmission mechanism thoroughly is analyzed about half-screwed pile based on the static load experiment results. Researching its work performance, load transfer mechanism, the force mode, has important theoretical and practical significance.

Half-screwed pile is cylinder type in the top, and screwed at the bottom. As a new type of pile with very high practical value, its development prospect is very broad. The pile process and technical performance are analyzed generally, and advantages in application are introduced.

Environmental pollution caused by the construction of buildings is attracting increasing attention. Practically, people have put forward a serious of effective methods to reduce or prevent the pollution, in which optimizing the architectural design plays an important role. This paper gave predictive assessment on the self-composite thermal insulation from aspects such as construction technologies, structure and constitution of this kinds of materials, also includes characteristic of the technologies we used. Besides, an analysis is carried out, from different aspects, on the environmental impact of the precast concrete composite thermal insulation system construction. The results reveal that the pollution is far less than that caused by conventional structure building within the lifecycle.