Anticorrosive steel strand and its production method

A technology for steel strands and a manufacturing method, applied in the field of anti-corrosion prestressed bars and their production, can solve the problems of short service life of steel strands, easy cracking of epoxy coatings, easy generation of pinholes, etc. Good anchoring effect and not easy to crack

Inactive Publication Date: 2007-07-11
LIUZHOU OVM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of anti-corrosion steel strand which is completely filled with thermoplastic polymer material inside and covered with thermoplastic polymer material and its production method, so as to overcome the existing epoxy coating The epoxy coating of the steel strand is easy to crack and fall off, and it is also easy to produce pinholes, which leads to the defect of short service life of the steel strand

Method used

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  • Anticorrosive steel strand and its production method
  • Anticorrosive steel strand and its production method
  • Anticorrosive steel strand and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An anti-corrosion steel strand, which is formed by twisting a central wire 1 and a side wire 2, and is filled with an anti-corrosion material 3 around the center wire 1 and the side wire 2 and the interstices between the twists, and the outermost layer of the wire Coated with an anti-corrosion layer 4, the anti-corrosion material filled around the center wire and the side wires and the intertwined gaps and the anti-corrosion material coated on the outer periphery of the outermost side wires to form the anti-corrosion layer are all the same thermoplastic polymer material— — Polyethylene or polyolefin (see Figure 1, Figure 2), Figure 1 is 7 steel strands, Figure 2 is 19 steel strands, in Figure 2: 21 is the inner layer edge wire, 22 is the outer layer edge wire , the inner side wire 21 and the outer layer side wire 22 are collectively referred to as the side wire 2.

[0036] As a modification of this embodiment, the anti-corrosion material filled around the center wire an...

Embodiment 2

[0038] A kind of anti-corrosion steel strand with anti-slip structure, its basic structure is the same as that of Embodiment 1, and it is still formed by twisting the central wire 1 and the side wire 2, and it is filled in the surroundings of the center wire 1 and the side wire 2 and the twisted gap There is an anti-corrosion material 3, coated with an anti-corrosion layer 4 on the outer periphery of the side wire, the anti-corrosion material filled in the center wire and the side wire and the interstices between them and the anti-corrosion material coated on the outer circumference of the side wire. It is a thermoplastic polymer material—polyethylene or polyolefin, the difference is that: the outside of the anti-corrosion layer 4 of the steel strand is an anti-corrosion layer with a non-slip structure.

[0039] The anti-slip structure on the outside of the anti-corrosion layer 4 of the steel strand can be N protruding thin helixes 5, that is: N protruding thin helixes 5 are di...

Embodiment 3

[0043]The manufacturing method of the anti-corrosion steel strand described in the first embodiment is that the steel strand is first disassembled, and then the center wire and the edge wire are coated with a layer of thermoplastic polymer material around the center wire and the side wire through a pressurized extrusion process, and then twisted, and then the Extrusion molding process, so that the outside of the outermost edge wire of the steel strand is coated with a layer of thermoplastic polymer material to form an inner filling layer and an outer coating layer that are integrated with each other. The specific steps are as follows:

[0044] A. Pre-treatment of steel strands:

[0045] ①Clean the steel strand and dry it,

[0046] ② Split the steel strands: Open the prestressed steel strands according to the predetermined length in turn,

[0047] ③ Preheat the center wire and side wire in the open state of the steel strand;

[0048] B. Pretreatment of thermoplastic polymer m...

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Abstract

The invention relates to an anti-corrosion steel strand, which is made of central line and edge wire by twisting. Anti-corrosion material, which is filled round the central line and edge wire and in the twisting gap and which is coated round the outset layer of edge wire to form anti-corrosion layer, is made of thermoplastic polymers. The anti-corrosion material round the central line and edge wire and in the twisting gap is melted with the anti-corrosion material round the outer layer of edge wire together. The outer anti-corrosion layer can be the anti-corrosion layer with anti-sliding structure. The manufacturing method of steel strand is that the steel strand is taken apart; the central line of steel strand and each edge wire are coated wit a layer of thermoplastic polymers by turbocharged plastic extrusion process so that the outset edge wire of steel strand is coated by a layer of thermoplastic polymer, which forms inner filling layer and outer coating layer, which are melted together, finally cooling is carried. The steel strand is provided with strong anti-corrosion ability, long service life, improved construction performance by outer anti-sliding structure and good effect for anchorage.

Description

Technical field: [0001] The invention relates to an anti-corrosion prestressed tendon and a production method thereof, in particular to an anti-corrosion steel strand whose anti-corrosion material is a thermoplastic polymer material and a production method thereof. Background technique: [0002] Steel strands are generally twisted by center wires and side wires. At present, there are generally two types of anti-corrosion steel strands. The first one is to directly coat a layer of anti-corrosion layer on the outer layer of steel strands (see figure 4), the second is to twist the central wire and each side wire that make up the steel strand to anti-corrosion treatment and then twist them into a steel strand (see Figure 5) or to coat a layer of anti-corrosion layer on the outer layer of the steel strand to form Composite anti-corrosion layer steel strands (see Figure 6), spraying anti-corrosion steel strands is one of them, the existing spray-coated anti-corrosion steel strands...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/16D07B1/06D07B7/14
CPCD07B1/0693D07B5/006D07B2201/2044D07B2201/2046
Inventor 陈文杰龙跃黄芳玮唐建国谭柳芳曾宪民张升华
Owner LIUZHOU OVM MASCH CO LTD
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