A construction device and method for maintaining ultra-high performance concrete filled steel pipe columns at room temperature

A concrete-filled steel tubular column and ultra-high performance technology, applied in columns, piers, pillars, etc., can solve problems such as difficult application and inability to implement on-site, and achieve the effects of good feasibility, convenient construction, and improved construction efficiency.

Active Publication Date: 2021-02-02
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultra-high performance concrete usually requires steam curing, and the requirements for curing conditions are relatively strict. In operation, a special curing box or curing room is required for curing, which is difficult to apply to actual projects, and cannot be implemented on site.

Method used

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  • A construction device and method for maintaining ultra-high performance concrete filled steel pipe columns at room temperature
  • A construction device and method for maintaining ultra-high performance concrete filled steel pipe columns at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Please check Figure 1-2 , a construction device for maintaining ultra-high performance steel pipe 1 concrete column 2 at room temperature in this embodiment, including concrete column 2, steel pipe 1, and insulation layer 3;

[0022] The thermal insulation layer 3 is a layer of high foamed polyethylene material, which is sealed on the outer periphery of the steel pipe 1;

[0023] The interior of the steel pipe 1 is filled with concrete columns 2, and the temperature inside the steel pipe 1 is 70-90°C;

[0024] The concrete column 2 is composed of water, cement, silica fume, quartz powder, polycarboxylate superplasticizer, quartz sand and sodium polyacrylate in a mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03 It is mixed; the sodium polyacrylate added in the component can absorb 15-30 times of its own weight of water during the concrete mixing process, providing sufficient hydration water for the concrete in the early stage of curing. The polycarboxylate-based high-perf...

Embodiment 2

[0027] Adopt embodiment 1 device to carry out the method for maintenance construction, may further comprise the steps:

[0028] 1) Mix water, cement, silica fume, quartz powder, polycarboxylate superplasticizer, quartz sand and sodium polyacrylate in a mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03, and put in In the concrete mixer, stir for 15 to 20 minutes to obtain finished concrete;

[0029] 2) Pour the finished concrete into the steel pipe 1, vibrate for 1-2 minutes every time one-third of the height of the steel pipe 1 is poured, until all the pouring is completed;

[0030] 3) Maintain the temperature of the steel pipe 1 and the finished concrete at 70-90°C, uniformly cover the steel pipe 1 with a layer of high foamed polyethylene as the insulation layer 3, and use glue to bond the high foamed polyethylene insulation layer 3 and the steel pipe 1 together , when the insulation layer 3 is bonded and sealed, it is bonded under slight extrusion, so that the bonding surfaces o...

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Abstract

The invention discloses a construction device and method for maintaining an ultra-high-performance concrete-filled steel pipe column at room temperature, including a concrete column, a steel pipe, and an insulation layer; the concrete column is made of water, cement, silica fume, quartz powder, and polycarboxylic Water agent, quartz sand and sodium polyacrylate are mixed according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03. After 7 days of curing, ultra-high performance concrete with a strength exceeding 150MPa can be obtained. The invention has good technical feasibility and convenient construction, and the concrete can be cured under normal temperature to obtain ultra-high performance concrete, thereby greatly improving the bearing capacity of the steel pipe concrete column, which not only ensures the construction quality on site, but also improves the construction efficiency. In addition, no autoclave equipment is needed, which saves construction costs and is beneficial to popularization in actual projects.

Description

technical field [0001] The invention relates to a construction device and method for maintaining ultra-high performance steel pipe concrete columns at normal temperature. Background technique [0002] The concrete-filled steel tube column is a new type of high-efficiency composite member, which is composed of steel tubes and inner-filled concrete. Through the collaborative work of steel pipes and concrete, CFST can give full play to the material properties of both steel and concrete. In recent years, super high-rise buildings have developed rapidly in our country. Concrete-filled steel tube columns in super high-rise structures bear huge axial force and bending moment, but the strength of concrete currently used in projects is generally low (not exceeding C80), resulting in huge cross-sectional dimensions of steel tube concrete columns, which increase the structure's self-weight, Reduced the effective use of building space. The compressive strength of ultra-high-performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/34E04G21/24C04B28/00
CPCC04B28/00E04C3/34E04G21/246C04B14/06C04B18/146C04B24/26C04B2103/302
Inventor 胡红松郭子雄林凡王晨
Owner HUAQIAO UNIVERSITY
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