Method for constructing built-in hollow-out steel pipe steel fiber concrete protective layer
A technology for steel fiber reinforced concrete and concrete filled steel tubular columns, which is applied in the direction of coastline protection, building structure, structural elements, etc. The effect of improving crack stiffness and mechanical properties
Active Publication Date: 2014-01-29
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
The steel pipe surface of concrete filled steel pipe is relatively smooth, and the bonding effect with the external concrete protective layer is not good. Once the concrete cracks, the steel pipe will lose its protection
Method used
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[0033] Below in conjunction with the accompanying drawings, the construction method of the built-in hollow steel pipe steel fiber reinforced concrete protective layer of the present invention is described:
[0034] figure 1 , image 3 They are respectively the square and circular section protective layer structures of the present invention. The outermost layer is a steel fiber protective layer. In the middle of the protective layer, a hollow steel pipe is built in. The inner layer is the structural part of an ordinary steel tube concrete column.
[0035] According to the structure shown in the figure, the order from the outer layer to the inner layer is as follows: - - - - 。
[0036] The steel fiber reinforced concrete is bonded to the outer surface of the inner steel pipe, which is protected by a protective layer from corrosion.
[0037] figure 2 , Figure 4 It is a schematic diagram of the structure of the hollow steel pipe and the protective layer, indicati...
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Abstract
Provided is a method for constructing a built-in hollow-out steel pipe steel fiber concrete protective layer. Steel fiber hollow-out steel pipe concrete is arranged on the outer side of a concrete filled steel tubular structure column to protect the concrete filled steel tubular structure column and improve duration of a structural component. The thickness 2f of the protective layer is not smaller than 70mm. The wall thickness e2 of a thin wall hollow-out steel pipe is not smaller than 5mm, the hollow-out steel pipe is arranged in the middle of the protective layer, the protective layer is poured by steel fiber concrete, and the mixing quantity of steel fibers counts for 1-1.5% of the volume of the concrete. For the hollow-out steep pipe, a hollow-out structure is formed by round holes with the diameter of 50mm in an array mode. The clear spacing of the round holes is all 50mm and is the same as the diameter d. Due to the anti-corrosion effect of the steel fibers and the restriction effect of the hollow-out steel pipe on the protective layer, the concrete filled steel tubular structure column is protected in a corrosive environment, and the hollow-out steel pipe also has the auxiliary bearing capacity. The method for constructing the built-in hollow-out steel pipe steel fiber concrete protective layer can be used in the severe corrosive environments of artificial islands, watercourses, port engineering, ocean platforms and the like.
Description
technical field [0001] The invention relates to the anti-corrosion structure design of steel pipe concrete columns, and belongs to the field of structural durability design. In order to prevent the corrosion of concrete-filled steel tube columns in severe corrosive environments, steel fiber hollowed-out concrete-filled steel tubes are used as protective layers, which can be used in the construction of structures such as port projects, artificial islands, marine and river engineering, and offshore platforms to prevent durability problems from causing Structural damage. [0002] Background technique [0003] Severe corrosion environment such as the water level change area of the marine environment, the steel pipe concrete column of the offshore platform, artificial island, port engineering structure, etc., there are many protection methods, such as the use of anti-corrosion coating materials and cathodic protection technology. Anti-corrosion coating materials must be maint...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E04G21/00E04C3/34E04C5/06E01D19/02E01D21/00E02B3/06E02D27/52
Inventor 王海超
Owner SHANDONG UNIV OF SCI & TECH