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预制圆形混凝土柱时,拆模后表面常出现气孔、麻面、露筋、微细裂纹等缺陷。例如我们制作某工程冷却塔人字柱时,施工初期就遇到人字柱表面有气孔现象,后经不断改进,才克服了这种缺陷。一、施工概况及遇到的问题该人字柱长9.67m,截面直径为0.65m,竖向钢筋为18φ25,螺旋箍筋为φ10@200,混凝土强度等级为C30、P6、F150,该冷却塔共有人字柱88根。预制地点设在工地预制场内。模板为上、下两个半圆扣合模具,由10
When prefabricated circular concrete columns are used, defects such as pores, hemp surfaces, exposed tendons, and fine cracks often appear on the surface after the mold is removed. For example, when we made a cooling tower column for an engineering project, we encountered stomatal phenomena on the surface of the herringbone during the initial period of construction. After continuous improvement, we overcome this defect. I. Construction Overview and Problems Encountered The length of the post is 9.67m, the section diameter is 0.65m, the vertical reinforcement is 18φ25, the spiral stirrup is φ10@200, and the concrete strength grade is C30, P6, F150. The cooling tower A total of 88 people columns. The prefabrication site is located in the site prefabrication field. The template is the upper and lower two semi-circular fastening dies, which are composed of 10