Method of connecting a circular concrete-filled steel tubular column to a reinforced concrete footing

Patent metadata

Field	Value
Publication number	US-10954672-B2
Application number	US-201916706593-A
Country	US
Kind code	B2
Filing date	Dec 6, 2019
Priority date	Dec 27, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The method of connecting a circular concrete-filled steel tubular column to a reinforced concrete footing provides a process for constructing a circular concrete-filled steel tubular column anchored in a reinforced concrete footing. A tubular member is partially embedded in a cavity formed in a block of reinforced concrete, such that a pair of flanges thereof is positioned adjacent to and above a base surface of the cavity. A steel tube is partially inserted into the cavity, such that rotation of the steel tube will cause the pair of flanges to interlock with a pair of slots at the lower end of the steel tube, locking the steel tube in place with respect to the tubular member and the block of reinforced concrete. The cavity is filled with concrete grout to secure the column, and the steel tube is filled with concrete to form the circular concrete-filled steel tubular column.

First claim

We claim:

1. A method of connecting a circular concrete-filled steel tubular column to a reinforced concrete footing, comprising the steps of:
providing a reinforced concrete footing comprising a block of reinforced concrete having opposed top and bottom surfaces;
forming a cavity in the block of reinforced concrete, the cavity having an open upper end, a closed lower base, and at least one sidewall within the block of reinforced concrete, the upper end of the cavity being contiguous with the top surface of the block of reinforced concrete and having an elliptical opening, and the closed lower base being circular, the elliptical opening of the upper end of the cavity defining a major axis having a length, the circular base having a diameter equal in length to the length of the major axis of the elliptical opening;
partially embedding a tubular member in the block of reinforced concrete at the base of the cavity, the tubular member having a cylindrical sidewall and open upper and lower ends, and further having at least one pair of diametrically opposed flanges mounted on the open upper end and extending radially outward therefrom, the flanges being raised above the base of the cavity;
providing a column comprising a steel tube having a cylindrical sidewall and an elliptical base plate mounted on an open lower end of the cylindrical sidewall of the steel tube, the elliptical base plate having a central circular opening in open communication with the open lower end of the cylindrical sidewall and at least one pair of diametrically opposed brackets projecting from the elliptical base plate, the at least one pair of brackets defining at least one pair of flange slots, the elliptical base plate having a major axis equal in length to the length of the major axis of the elliptical opening of the cavity;
partially inserting the steel tube into the cavity of the block of reinforced concrete such that the at least one pair of diametrically opposed brackets are positioned circumferentially adjacent to and below the at least one pair of diametrically opposed flanges;
rotating the steel tube about an axis thereof such that the at least one pair of diametrically opposed flanges interlock with the at least one pair of slots defined by the at least one pair of diametrically opposed brackets so that the steel tube is locked in place with respect to the tubular member;
filling the cavity with concrete grout to secure the column in the reinforced concrete footing; and
filling the column with concrete to form a circular concrete-filled steel tubular column.

2. The method of connecting a circular concrete-filled steel tubular column to a reinforced concrete footing as recited in claim 1 , wherein the at least one sidewall defining the cavity has a corrugated internal surface.

Assignees

• Univ King Saud

Inventors

• Abbas Husain
• Al-Salloum Yousef A
• Almusallam Tarek H
• Siddiqui Nadeem A
• Khateeb Baha M A

Classifications

• E04G13/02

  for columns or like pillars; Special tying or clamping means therefor {(columns, pillars of concrete with permanent forms E04C3/34)} · CPC title

• E04C3/34 Primary

  of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings (E04C3/36 takes precedence) · CPC title

• E04C3/32

  of metal (E04C3/36 takes precedence) · CPC title

• E04G21/14

  Conveying or assembling building elements (roofing E04D; finishing work E04F) · CPC title

• E04C3/30

  Columns; Pillars; Struts (not designed for end loading E04C3/02; posts, masts, as independent structures E04H12/00) · CPC title