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Casting concrete at the negative moment area of the Steel Box girder °£¼®°í°¡Â÷µµ Àü°æ
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Stop up a hole for casting concrete °¹Ú½º ³» ÄÜÅ©¸®Æ® ÃæÁø Àü°æ
The sight of concrete in negative moment area of steel box