Injection Method for CLB Project Concrete Structure Crack

CLB工程混凝土板結(jié)構(gòu)裂紋修補(bǔ)方案-注射法

1.     General Description for Crack:

裂紋概述

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使用不當(dāng)?shù)姆椒ǘ询BCLB混凝土預(yù)制塊從而導(dǎo)致其中一些板塊出現(xiàn)結(jié)構(gòu)裂紋。這些裂紋主要由于混凝土上表面受到堆疊位置不當(dāng)?shù)膲|塊所產(chǎn)生的負(fù)彎矩所產(chǎn)生的拉應(yīng)力而形成，且主要集中在配筋截面為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.

  當(dāng)混凝土上表面的堆積荷載釋放時(shí)，這些結(jié)構(gòu)裂紋的寬度有明顯縮小。當(dāng)這些混凝土板被吊裝至模塊上時(shí)，由于受到自重荷載的影響，混凝土的上表面會(huì)進(jìn)一步受壓從而可使裂紋進(jìn)一步的閉合。

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.

在對(duì)這些裂紋進(jìn)行調(diào)查之后，SKM及ZPMC的工程師發(fā)現(xiàn)這些裂紋的深度僅在5-10mm之間。這表明由于堆疊不當(dāng)所引起的裂紋只出現(xiàn)在混凝土的外表面，且深度不深。因此這些裂紋不會(huì)影響截面的有效性或強(qiáng)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. 

根據(jù)澳洲標(biāo)準(zhǔn)AS3735及英國(guó)規(guī)范，海洋工程可以接受寬度為0.1mm的裂紋，因此SKM接受那些寬度小于0.1mm的裂紋，且不要進(jìn)行任何修補(bǔ)。對(duì)于寬度大于0.1mm的裂紋需用注射法使修補(bǔ)漿液完全滲入裂紋以減少鋼筋被腐蝕的風(fēng)險(xiǎn)。

  Patching Process:

修補(bǔ)工藝：)   Work Team:施工隊(duì)伍)   Patching Material:

修補(bǔ)材料

a.      Patching Glue: