Reinforcing structure and reinforcing method of sea sand steel bar concrete beam

A technology for reinforced concrete beams and reinforced structures, which is applied in building construction, construction, building maintenance, etc., and can solve problems such as poor durability, ineffective prevention, and insufficient bearing capacity.

Pending Publication Date: 2017-07-21
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to directly remove the sea sand concrete on the tension side, remove the rust on the surface of the steel bar, and then pour the concrete or mortar with high impermeability to replace the rust around the steel bar on the tension side after brushing the steel bar rust inhibitor as required. Sea sand concrete, but once the

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  • Reinforcing structure and reinforcing method of sea sand steel bar concrete beam
  • Reinforcing structure and reinforcing method of sea sand steel bar concrete beam

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a reinforced structure of sea sand reinforced concrete beams, such as figure 1 As shown, it includes the sea sand concrete layer 3 and the reinforcement layer that are arranged next to each other from top to bottom. The reinforcement layer includes the tensile steel bar 2 and the ultra-high toughness cement-based composite material (ECC-Engineered Cementitious Composites) Layer 1.

[0030] After the concrete beam cracks, it often cannot continue to bear the load due to the large cracks. Compared with ordinary concrete, ultra-high toughness cement-based composite (ECC) has ultra-high tensile toughness, can continue to bear after cracking, and can repair the structural bearing capacity; at the same time, due to the fiber bridging effect of ECC constrains its The development of its own cracks, and the bridging stress is transmitted to the adjacent uncracked matrix, and the adjacent matrix cracks after reaching the cracking strength. In this way, E...

Embodiment 2

[0035] This embodiment is a further improved embodiment of Embodiment 1, which includes all the content of Embodiment 1, that is, the reinforcement structure of the sea sand reinforced concrete beam provided by this embodiment includes the reinforcement structure of the sea sand reinforced concrete beam of Embodiment 1. All structural features, the improvements are:

[0036] Such as figure 2 As shown, the reinforced structure of the sea-sand reinforced concrete beam provided by this embodiment is covered with a fiber reinforced composite material (FRP-Fiber Reinforced Polymer) layer 4 under the ultra-high toughness cement-based composite material layer 1 .

[0037]If the sea-sand reinforced concrete beam is too severely corroded and the ECC reinforcement is not enough to lift the structure to the original bearing capacity, the FRP layer 4 can be pasted under the ECC layer 1. For example, in this embodiment, the new combination of FRP-ECC is used. reinforcement. According to...

Embodiment 3

[0042] This embodiment provides a reinforcement method for sea-sand reinforced concrete beams. The sea-sand concrete around the steel bars 2 on the tension side is removed and then coated with antirust agent for the steel bars, and super-toughness cement-based composite materials ( ECC-Engineered Cementitious Composites) layer 1, and the poured ultra-high toughness cement-based composite material layer 1 is coated on the outside of the tensile steel bar 2.

[0043] ECC has ultra-high tensile toughness, can continue to bear after cracking, and can repair the structural bearing capacity; at the same time, due to the fiber bridging effect of ECC, it constrains the development of its own cracks and transfers the bridging stress to the adjacent uncracked The matrix, close to the matrix, cracks after reaching the cracking strength. In this way, the ECC produces many fine and dense cracks with approximately equal spacing, which can effectively prevent the chloride ions in the upper se...

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Abstract

The invention relates to the technical field of building engineering and discloses a reinforcing structure of a sea sand steel bar concrete beam. The reinforcing structure comprises a sea sand concrete layer and a reinforcing layer which are sequentially arranged in an adjoining mode from top to bottom. The reinforcing layer comprises a tensile steel bar and an ultrahigh toughness cement-based composite material layer covering the tensile steel bar. The invention further discloses a reinforcing method of the sea sand steel bar concrete beam. The reinforcing method comprises the steps that sea sand concrete on the periphery of the steel bars on the tensile side is cleaned up, the ultrahigh toughness cement-based composite material layer is poured outside the exposed tensile steel bar, and the poured ultrahigh toughness cement-based composite material layer is made to cover the tensile steel bar. According to the reinforcing structure and reinforcing method of the sea sand steel bar concrete beam, ECC (Engineered Cementitious Composites) are utilized to separately reinforce the sea sand steel bar concrete beam, or FRP (Fiber Reinforce Polymer)-ECC is utilized to reinforce the sea sand steel bar concrete beam in a combined mode, so that the bearing capacity of the sea sand steel bar concrete beam is effectively repaired, the ductility of the structure is improved, the situation that chloride ions and harmful media in the external environment corrodes the tensile steel bar is resisted, and the steel bar is prevented from being rusted for the second time, so that the durability of the structure is improved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a reinforcement structure and a reinforcement method of a sea sand reinforced concrete beam. Background technique [0002] River sand resources are increasingly scarce, especially in coastal areas where engineering construction develops rapidly, and there has been a serious shortage of construction sand. In order to save economic costs, some unscrupulous manufacturers use sea sand or sea sand whose chloride ion content does not meet the standard after treatment for construction. High chloride ions in sea sand will destroy the passivation film on the surface of steel bars, resulting in rapid corrosion of steel bars and a decrease in structural bearing capacity, resulting in a large number of substandard housing constructions. [0003] At present, the direct repair method is commonly used for sea-sand concrete beams. This method is to directly remove the sea sand...

Claims

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Application Information

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IPC IPC(8): E04G23/02
CPCE04G23/0218Y02A30/30
Inventor 周英武邢锋隋莉莉罗敏慎俞可权李大望吴宇飞
Owner SHENZHEN UNIV
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