一种钢管混凝土叠合柱埋入式柱脚节点

Abstract

本实用新型涉及一种钢管混凝土叠合柱埋入式柱脚节点，包括钢管混凝土叠合柱埋入段、贴焊环筋、环形钢筋、受力钢筋；贴焊环筋沿叠合柱的柱高方向同轴向设置在钢管混凝土叠合柱埋入段的钢管外壁上，通长满焊或间断焊；受力钢筋设有与钢管混凝土叠合柱埋入段相适应的截断区，钢管混凝土叠合柱埋入段插入于受力钢筋的截断区内；环形钢筋对应受力钢筋标高设置，和钢管同轴环设于钢管外；受力钢筋卡扣于环形钢筋且其内侧抵接于贴焊环筋，不需另设搭接板或搭接牛腿，连接方式简单、锚固安全可靠，减少用钢量和现场焊接量。设置线刚度更大的管外贴焊环筋代替栓钉，加强钢管外壁界面的粘结，有利于柱底内力向基础扩散，整体性更好，对柱纵筋箍筋的穿插摆放影响更小。

Claims

1. A concealed column base joint of a concrete filled steel tube composite column, characterized in that: This includes embedded sections of steel-concrete composite columns, welded ring bars, ring-shaped reinforcing bars, and reinforcing bars for foundations, basement slabs, or ground beams. The reinforcing bars are provided with a cut-off zone adapted to the embedded section of the steel-concrete composite column, and the embedded section of the steel-concrete composite column is inserted into the cut-off zone of the reinforcing bars. The welded ring reinforcement is set axially along the column height direction on the outer wall of the steel pipe of the embedded section of the steel-concrete composite column, and is fully welded or intermittently welded along its length. The ring-shaped reinforcing bars are set at the same elevation as the stressed reinforcing bars and are coaxially arranged around the outside of the steel pipe. The reinforcing bars are snapped into the ring bars and their inner sides abut against the welded ring bars. The ring bars are used to bear the tensile force of the reinforcing bars.

2. The encased column with concrete filled steel tube according to claim 1, characterized in that: The cross-section of the composite column is circular, square, or rectangular, and the steel pipe is circular, square, or rectangular.

3. The encased column with concrete filled steel tube according to claim 1, characterized in that: Ring reinforcement bars can be in single rows, double rows, or parallel rows.

4. The encased column with concrete filled steel tube according to claim 1, characterized in that: The ring-shaped reinforcement includes upper and lower face reinforcement and bottom reinforcement arranged correspondingly. The face reinforcement and bottom reinforcement are connected by stirrups to form a centrally symmetrical ring-shaped hidden ring beam. The stressed reinforcement is arranged along the circumference of the hidden ring beam.

5. The encased column with concrete filled steel tube according to claim 1, characterized in that: The ring reinforcement has a horizontal and vertical clearance to allow for the insertion of the reinforcing bars and the flow of concrete aggregate.

6. The encased column with concrete filled steel tube according to claim 1, wherein: The reinforcing bars extend horizontally from the outside to the inside, then bend downwards and anchor for a distance. Short reinforcing bars are welded to both sides at the end of the bent anchor section, forming a rigid point contact that is snapped into the ring-shaped reinforcing bars.

7. The encased column with concrete filled steel tube according to claim 1, characterized in that: Multiple welded ring bars are arranged sequentially along the height direction of the embedded section of the steel-concrete composite column, with a spacing of no more than 300mm and a number of no less than 3. The welded ring bars are welded on both sides of the entire length or on one side in an alternating manner.

8. The encased column with concrete filled steel tube according to claim 1, characterized in that: The total length of the weld on each side of the welded ring reinforcement shall not be less than half the length of the ring reinforcement, and the weld height shall be 0.5 times the diameter of the welded ring reinforcement.

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