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Protection method of prestressed concrete post-tensioning steel strand anchorage

A steel strand and concrete technology, applied in the field of science, can solve problems such as the difficulty of fully sealing the anchor clips and anchor holes, the complex structure of the porous anchorage system, and the impact on the bonding of new and old concrete, so as to ensure long-term service safety , The protective operation specification is easy to follow, and the protective effect is good

Inactive Publication Date: 2010-06-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The high-performance thermosetting coating is used to protect the anchor system and the steel strands whose sheath is stripped and damaged as a whole. less efficient
Moreover, it is difficult to completely seal the anti-corrosion inside the anchor clip and the anchor hole, and the pollution of the paint may affect the bonding of the old and new concrete.

Method used

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  • Protection method of prestressed concrete post-tensioning steel strand anchorage
  • Protection method of prestressed concrete post-tensioning steel strand anchorage
  • Protection method of prestressed concrete post-tensioning steel strand anchorage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A prestressed concrete post-tensioned steel strand 10 anchorage protection method, the protection method requirements of the prestressed concrete post-tensioned steel strand 10 anchorage are as follows:

[0061] 1) First, use a solvent-free thermosetting polymer liquid paint to repair and pour the paint to specifically perform surface coating anti-corrosion maintenance treatment, and form an insoluble and fused durable protective coating on the outside of the anchorage of the steel strand 10; the solvent-free thermosetting polymer liquid The performance index of the coating should meet the requirements stated in Table 1;

[0062] 2) Select reasonable perfusion plastic jackets and fixtures: through reasonable design, chlorine-free plastic jackets can protect the prestressed concrete post-tensioned steel strand 10 anchors on site, whether they have been stretched or not. The tension can be installed quickly, and the seal is reliable, and the length of the injection is arb...

Embodiment 2

[0087] The content of this embodiment is basically the same as that of Embodiment 1, and its difference mainly lies in:

[0088] In the prestressed concrete post-tensioned steel strand 10 anchorage protection method described in this embodiment, the anti-corrosion construction scheme of the anchor head of the pre-stressed concrete post-tensioned steel strand 10 anchor is specifically the sheath pipe anti-corrosion method: The specific requirements of the sheath pipe anti-corrosion method are (anchor system anti-corrosion as attached figure 2 ):

[0089] 1) After the on-site prestressed steel strand 10 is stretched, use a special hydraulic cutting tool to cut off the excess steel strand 10 at the tensioned end;

[0090] 2) Use an appropriate method to quickly remove the oil stains left during the anchorage tensioning process, and then use a special cleaning agent to quickly clean up the remaining pollutants;

[0091] 3) According to the stripping length of the 10 steel stran...

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Abstract

The invention relates to a protection method of a prestressed concrete post-tensioning steel strand anchorage, comprising the following requirements in sequence: (1) firstly, using a solvent-free thermosetting polymer liquid coating to repair a perfusion coating, concretely carrying out surface coating antiseptic maintenance treatment, and forming insoluble and infusible durable protective coatings at the outer part of the steel strand anchorage; the performance indicators of the solvent-free thermosetting polymer liquid coating should meet the requirements; (2) and selecting a perfusion plastic jacket and a clamp to carry out outer packaging protection to the prestressed concrete post-tensioning steel strand anchorage on site to connect the tensioning end with the fixing end of the anchorage into a body. The protection operating specifications of the protection method to the prestressed concrete post-tensioning steel strand anchorage are easy to comply, the protective effect is good, the service life is long, and the protection method has foreseeable huge economic and social values.

Description

technical field [0001] The invention relates to science, and in particular provides a protective method for prestressed concrete post-tensioned steel strand anchors. Background technique [0002] In the prior art, in order to increase the requirements of the high-pressure fluid inside the concrete structure on the tensile and impact strength of the concrete pipe wall, steel strands are usually coated with anti-strength coating on the outside and / or the gaps between the strands. Corrosion-coated unbonded prestressed steel strands as structural members prestressed in concrete and loaded in tension to ensure Cl under high tensile stress and wet conditions - , SO 4 2- , CO 3 2- The hazards caused by the intrusion of sensitive ions such as stress corrosion. Among them, due to the needs of post-tensioning work on the part of the tensioning anchorage, the original prefabricated corrosion-resistant coating must be partially peeled off during the on-site construction process, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F15/00B05D7/24C09D201/00C09D163/00C09D5/08
Inventor 陆卫中曲兴辉李京高学奎张立新王思彤
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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