英文版裂缝修补施工方案

Injection Method for CLB Project Concrete Structure Crack

CLB工程混凝土板结构裂纹修补方案-注射法

1.     General Description for Crack:

裂纹概述

Some CLB project concrete panels have cracked due to the support stools in the stacks of panels not being aligned by ZPMC. Larger cracks have occurred where upper stools are outside the lower stools and the cantilever end of the loaded panel bends down and the top surface goes into tension where there are only N20 – 150 bars.

由于ZPMC使用不当的方法堆叠CLB混凝土预制块从而导致其中一些板块出现结构裂纹。这些裂纹主要由于混凝土上表面受到堆叠位置不当的垫块所产生的负弯矩所产生的拉应力而形成，且主要集中在配筋截面为N20-150 bars。

 The crack widths have reduced when stack load is released and we think these cracks from bending will close up further when placed on the topside modules because the cracks are about 3m in from the end or middle span, and this area will sag under its own weight and close up the top of the slab.

  当混凝土上表面的堆积荷载释放时，这些结构裂纹的宽度有明显缩小。当这些混凝土板被吊装至模块上时，由于受到自重荷载的影响，混凝土的上表面会进一步受压从而可使裂纹进一步的闭合。

After investigation by SKM & ZPMC team, we found the cracks were only 5 – 10mm deep only. This implies the crack is shallow and the tension in the concrete only caused cracking in the outer surface of the slab.  Thus the cracks are only surface and not affecting the effective section or strength.

在对这些裂纹进行调查之后，SKM及ZPMC的工程师发现这些裂纹的深度仅在5-10mm之间。这表明由于堆叠不当所引起的裂纹只出现在混凝土的外表面，且深度不深。因此这些裂纹不会影响截面的有效性或强度。

In accordance with AS3735 and British Standards it is acceptable to have cracks up to 0.1mm in a marine environment, therefore it is acceptable to have cracks less than 0.1mm with no treatment. Cracks wider than 0.1mm require an injection system to penetrate the crack and to reduce the risk to corrosion of reinforcement. 

根据澳洲标准AS3735及英国规范，海洋工程可以接受宽度为0.1mm的裂纹，因此SKM接受那些宽度小于0.1mm的裂纹，且不要进行任何修补。对于宽度大于0.1mm的裂纹需用注射法使修补浆液完全渗入裂纹以减少钢筋被腐蚀的风险。

  Patching Process:

修补工艺：)   Work Team:施工队伍)   Patching Material:

修补材料

a.      Patching Glue: