Axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps and construction process of such column

Patent metadata

Field	Value
Publication number	US-2017253526-A1
Application number	US-201415512068-A
Country	US
Kind code	A1
Filing date	Oct 24, 2014
Priority date	Sep 17, 2014
Publication date	Sep 7, 2017
Grant date	—

Abstract

An axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps and a construction process. The axial compression column includes a steel tube ( 1 ), high-strength fresh concrete ( 2 ), normal-strength demolished concrete lumps ( 3 ), a spiral stirrup ( 4 ), and longitudinal erection bars ( 6 ). The spiral stirrup ( 4 ) is arranged at a middle part inside the steel tube ( 1 ). The high-strength fresh concrete ( 2 ) is poured and the normal-strength demolished concrete lumps ( 3 ) are put alternately inside the steel tube ( 1 ). A compressive strength of the high-strength fresh concrete ( 2 ) is 30˜90 MPa greater than that of the normal-strength demolished concrete lumps ( 3 ).

First claim

1 . An axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps, characterized in that: a spiral stirrup or a plurality of horizontal stirrups are provided in three-fifths of a height range at a middle part in a steel tube, and high-strength fresh concrete is poured and normal-strength demolished concrete lumps are put alternately inside the steel tube, with a compressive strength of the high-strength fresh concrete being 30-90 MPa greater than that of the normal-strength demolished concrete.

2 . The axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps according to claim 1 , wherein the spiral stirrup is arranged in three-fifths of a height range at the middle part in the steel tube, with a section of the steel tube being circular; or the horizontal stirrups are arranged in three-fifths of a height range at the middle part in the steel tube, which are dense in the middle and sparse on both sides, with a section of the steel tube being circular or polygonal.

3 . The axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps according to claim 1 , wherein the normal-strength demolished concrete lumps are waste concrete lumps after demolishing old buildings, structures, roads, bridges or dams and removing protective layers and all or part of steel reinforcements.

4 . The axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps according to claim 1 , wherein the high-strength fresh concrete is a natural aggregate concrete or a recycled aggregate concrete, and has a compressive strength no less than 60 MPa.

5 . The axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps according to claim 1 , wherein the normal-strength demolished concrete lump has a characteristic size no less than 100 mm, and a mass ratio of the normal-strength demolished concrete lump and the high-strength fresh concrete is 1:4˜1:1.

6 . A construction process of the axial compression steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps according to claim 1 , characterized in that, it comprises following steps:
(1) spot welding a spiral stirrup or a plurality of horizontal stirrups and two longitudinal erection bars into one, then lifting the two longitudinal erection bars, arranging the spiral stirrup or the plurality of horizontal stirrups in three-fifths of a height range at a middle part in a steel tube, with a stirrup distance being that the stirrups are dense in the middle and sparse on both sides when horizontal stirrup is adopted, then spot welding the two longitudinal erection bars with an inner wall of the steel tube; (2) fully wetting normal-strength demolished concrete lumps in advance, when putting, pouring high-strength fresh concrete with about 20 mm thickness into a bottom of the steel tube first, then alternately putting wet normal-strength demolished concrete lumps and the high-strength fresh concrete inside the steel tube and fully vibrating until pouring is finished, so that the normal-strength demolished concrete lumps and the high-strength fresh concrete are uniformly mixed into one.

Assignees

• Univ South China Tech

Inventors

• Wu Bo
• Zhang Qiang

Classifications

• C04B18/04

  Waste materials; Refuse · CPC title

• E04C3/36

  of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials · CPC title

• C04B18/167 Primary

  Recycled materials, i.e. waste materials reused in the production of the same materials · CPC title

• E04C3/34

  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

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title