Concrete column capable of pre-applying confining pressure and its manufacturing method and reinforcement method

Abstract

The invention discloses a concrete column capable of pre-applying confining pressure, which comprises a first steel pipe surrounding the outside of the concrete column. There is a gap between the first steel pipe and the outer contour of the concrete column, and grouting material is pressurized and poured into the gap. The outer side of the concrete column is also surrounded by a second steel pipe, and the second steel pipe is arranged close to the concrete column. The invention also discloses a method for making a concrete column. In the method, the second steel pipe is used as a formwork, and concrete is poured inside. After hardening to form a concrete column, the first steel pipe is wrapped around the second steel pipe, and then poured to the first, The confining pressure is applied in the gap of the second steel pipe to complete the fabrication of the concrete column. The invention also discloses a concrete column reinforcement method. In the method, the concrete column can be reinforced by placing a first steel pipe on the outside of the existing concrete column, and then pouring a grouting material to exert confining pressure. The confining pressure in the present invention is actively applied, and different sizes of confining pressure can be applied according to needs, and the controllability is strong.

Description

technical field [0001] The invention relates to a concrete column, in particular to a concrete column capable of applying confining pressure in advance, a manufacturing method and a strengthening method thereof. Background technique [0002] Under the action of three-dimensional pressure, the compressive strength and deformation capacity of any material can be significantly improved. Such as figure 1 For the material shown, under the action of three-way pressure, the compressive strength in any direction is greater than that under unidirectional compression; when the compressive stress in the three directions is equal σ 1 = σ 2 = σ 3 , theoretically its compressive strength tends to infinity. For example, rocks on the seabed, although they are subjected to huge seawater pressure in the vertical direction, which has far exceeded the compressive strength of rocks under unidirectional compression, but because they are also affected by the confining pressure of surrounding r...

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Problems solved by technology

[0006] (1) The confining pressure is passively generated: only when the concrete column is compressed to a certain extent, and the longitudinal compression deformation and lateral expansion deformation are large, the steel pipe or fiber cloth can produce a certain confining pressure on the concrete column, and cannot actively generate confining pressure. Pressure;

[0007] (2) The size of the confining pressure is uncertain: the confining pressure is caused by the restraint of the lateral expansion of the concrete column, and the lateral expansion deformation of the concrete column is always changing during the compression process, so the corresponding confining pressure is also changes, and the process of confining pressure changes and the peak value that can be reached are difficult to determine;

[0008] (3) The confining pressure cannot restrain the deformation of the concrete column well: the confining pressure produced by the steel pipe and fiber cloth is gradually generated and increased, and the confining pressure of the concrete column is very small at the beginning of the compression, which cannot play a good restraint effect , with the continuous increase of longitudinal compression deformation and lateral expansion deformation, the effect of confining pressure gradually reaches the maximum, so when the concrete column reaches the ultimate bearing capacity, its deformation is relatively large;

[0009] (4) It is difficult to give full play to the material properties of steel pipes and fiber cloth: the stress of steel pipes and fiber cloth is relatively complicated, and the confining pressure is also passively generated, not completely and simply generating confining pressure, and its material properties are difficult to fully play;

[0010] (5) In some cases, if you want to adjust the size of the confining pressure during use, it is impossible to achieve

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