混凝土厚板和转换梁静态破碎试验

Static crushing experiment of thick concrete slab and concrete transfer beam

摘要:

混凝土厚板和转换梁是建筑结构中的重要水平构件。为探究如何绿色、高效地完成二者的拆除,本文开展了3个混凝土厚板试件和7个混凝土转换梁试件的静态破碎试验,并在破碎前切断或剔除配筋。试验结果表明:垂直于厚板顶面钻孔进行混凝土厚板破碎时,试件内的水平纵筋影响静态破碎过程中的开裂程度,沿孔连线及其延长线切断或剔除厚板上部纵筋可提高破碎效果,破碎后形成块体的短边尺寸为孔间距或孔边距；倾斜向下斜交于转换梁侧面钻孔进行混凝土转换梁破碎时,试件内的箍筋和纵筋均影响静态破碎过程中的开裂程度,沿孔口的连线及延长线切断孔口所在侧面的箍筋或纵筋,同时切断钻孔延长线与另一侧面交点的连线及延长线所交纵筋或箍筋可提高破碎效果,破碎后形成块体的短边尺寸为孔间距或孔排距；垂直于转换梁顶面钻孔进行混凝土转换梁破碎时,沿孔连线及其延长线切断梁顶箍筋后,梁内拉结筋影响静态破碎过程中的开裂程度,可继续缩小孔间距以提高破碎效果。

Abstract:

Thick concrete slab and concrete transfer beam are important horizontal components in building structures. To explore how to complete the demolition of the two components environmental-friendly and efficiently, static crushing experiments of three thick concrete slab specimens and seven concrete transfer beam specimens were carried out, and reinforcements were cut or removed before crushing. Experimental results showed that when the thick concrete slabs were broken by drilling holes perpendicular to the top surface of the slab, the cracking degree was affected by the horizontal longitudinal reinforcements of the specimens in the static crushing process; the crushing effect could be improved by cutting off along the hole connecting line and its extension line or removing the upper longitudinal reinforcements; the size of the short side of the blocks after crushing was hole spacing or hole edge distance. When the concrete transfer beams were broken by drilling holes inclined downward at the side surface of the beam, the cracking degree was affected by the stirrups and longitudinal reinforcements of the specimens in the static crushing process; the crushing effect could be improved by cutting off the stirrups or longitudinal reinforcements along the orifice connecting line and extension line, and cutting off the stirrups or longitudinal reinforcements along the connecting line and extension line of the intersection of the borehole extension line on the other side surface; the size of the short side of the blocks after crushing was hole spacing or hole row spacing. When the concrete transfer beams were broken by drilling holes perpendicular to the top surface of the beam, after the stirrups at the top of the beam were cut off along the hole connecting line and its extension line, the cracking degree was affected by the tie reinforcements of the specimens in the static crushing process, which could continue to reduce the hole spacing to improve the crushing effect.