# US 2017/0254083 A1 · Seismic 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

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2017/0254083 A1
- Document ID: US20170254083A1
- Status: Published application
- Kind: A1
- Application number: 15/512,069
- Filed: 2014-10-24
- Published: 2017-09-07
- Earliest claimed: 2014-09-17
- Assignees: South China University of Technology
- Applicants: South China University of Technology
- Inventors: Bo WU; Qiang ZHANG
- Web page: https://patentgrep.com/patent/US20170254083A1

## CPC

- E04C 3/32: of metal (E04C3/36 takes precedence)
- B28B 1/08: by vibrating or jolting {(of moulding sand B22C15/10; of concrete in general E04G21/063)}
- B28B 1/16: for producing layered articles (coating B28B11/04)
- C04B 18/16: from building or ceramic industry
- C04B 28/02: containing hydraulic cements other than calcium sulfates
- E04C 3/34: 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)
- E04C 3/36: of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
- E04H 9/021: {Bearing, supporting or connecting constructions specially adapted for such buildings}
- C04B 2111/2053: {Earthquake- or hurricane-resistant materials}
- C04B 2201/50: for the mechanical strength
- C04B 2201/52: High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A seismic 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 seismic column includes a steel tube (1), high-strength fresh concrete (2), normal-strength demolished concrete lumps (3), horizontal stirrups (4), and longitudinal erection bars (5). The horizontal stirrups (4) are arranged at upper and lower ends 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).

## Claims

### Claim 1

A seismic steel tubular column with internal local restraint and filled with high strengthen compound concrete containing normal-strength demolished concrete lumps, characterized in that: horizontal stirrups are provided at upper and lower ends inside a steel tube, with the steel tube having a circular or polygonal section; the horizontal stirrups corresponding to the circular section are uniformly arranged in one-seventh of a height range at the lower end of the steel tube and in one-seventh of a height range at the upper end of the steel tube respectively, while the horizontal stirrups corresponding to the polygonal section are uniformly arranged in one-fifth of a height range at the lower end of the steel tube and in one-fifth of a height range at the upper end of the steel tube respectively; 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.

### Claim 2 (depends on 1)

The seismic 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.

### Claim 3 (depends on 1)

The seismic 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.

### Claim 4 (depends on 1)

The seismic 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.

### Claim 5 (depends on 1)

A construction process of the seismic 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 plurality of horizontal stirrups and two longitudinal erection bars into one, then lifting the two longitudinal erection bars, uniformly arranging the plurality of horizontal stirrups in one-seventh of a height range at a lower end and in one-seventh of a height range at an upper end inside a steel tube respectively when the steel tube has a circular section, and uniformly arranging the plurality of horizontal stirrups in one-fifth of the height range at the lower end and in one-fifth of the height range at the upper end inside the steel tube respectively when the steel tube has a polygonal section, 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.