A Construction Method Applied to Prestressed Concrete Column Group

Abstract

The invention discloses a construction method applied to a prestressed concrete column group. The construction method comprises the steps that self-compacting concrete with an early strength property is adopted, mutual interference of an intensive reinforcing bar and a pre-embedded corrugated pipe is avoided in the pouring process and structure, and meanwhile, the concrete strength can meet the post-tensioning method construction requirement in a short time; a reasonable pouring method and a vibrating mode are adopted, the vibrating time is controlled, and the concrete pouring quality is guaranteed; a set-shaped steel formwork and a mortar leakage control measure are adopted, the appearance quality of pouring is guaranteed, circulation turnover of the formwork can be accelerated, and the set-shaped steel formwork and the mortar leakage control measure are used with the self-compacting concrete together, so that the construction period of the whole column group is shortened; sufficient maintenance time and reasonable maintenance measures are guaranteed, the situation that cracks occur on the outer surface of a prestressed column is controlled, and secondary destruction of post-tensioning method construction on the structure is avoided. The adverse factor of longer whole construction period of the prestressed concrete column group is overcome.

Description

technical field [0001] The invention belongs to the science and technology in the field of civil engineering construction, and designs a construction method of prestressed columns, in particular, a construction method applied to large-section prestressed concrete column groups. Background technique [0002] The prestressed post-tensioning method is generally used in long-span beams, and the actual construction requires that the concrete strength of the beam is greater than 90%. Due to the level of the beam body, for ordinary concrete, the construction work area is large and the depth is limited, so it can be poured directly. At the same time, whether it is a bridge or a building, the number of long-span beams is often limited (1-2). Therefore, the time of waiting for the concrete strength to meet the post-tensioning method is negligible relative to the total construction period of the entire structure. [0003] However, there are great differences in prestressed column grou...

AI Technical Summary

Problems solved by technology

[0003] However, there are great differences in prestressed column groups

First of all, as the support of the structure, there are often dozens of prestressed columns; second, the concrete must be poured downward from the column mouth. For non-prestressed columns, the structure is simple and there is no dense reinforcement. However, for prestressed columns, it is much more difficult, and the structure and pouring construction are mutually restricted; third, the cross-sectional area of ​​the column is relatively large, which belongs to the mass concrete pouring, and the probability of the existence of temperature cracks However, the prestressed post-tensioning method has extremely high requirements on the quality of concrete pouring, otherwise there will be large structural hidden dangers. In summary, prestressed concrete columns have extremely high requirements on construction quality and construction period. Therefore, architectural The concept of prestressed column group is often rarely used for design