CN110761099A - Unbonded prestressed steel strand - Google Patents
Unbonded prestressed steel strand Download PDFInfo
- Publication number
- CN110761099A CN110761099A CN201911216036.2A CN201911216036A CN110761099A CN 110761099 A CN110761099 A CN 110761099A CN 201911216036 A CN201911216036 A CN 201911216036A CN 110761099 A CN110761099 A CN 110761099A
- Authority
- CN
- China
- Prior art keywords
- flame
- retardant
- steel strand
- protective
- prestressed steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 239000003063 flame retardant Substances 0.000 claims abstract description 66
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 65
- 230000001681 protective effect Effects 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims description 15
- 229920000098 polyolefin Polymers 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000006261 foam material Substances 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/165—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay
- D07B1/167—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay having a predetermined shape
Landscapes
- Laminated Bodies (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention discloses an unbonded prestressed steel strand which comprises a plurality of prestressed steel strand bundles, a protective inner sleeve and a protective outer sleeve; the prestressed steel strand bundles are all arranged in the protective inner sleeve, and an anticorrosive layer is filled in gaps among the prestressed steel strand bundles; a plurality of flame retardant strips are uniformly distributed along the longitudinal direction of the outer side wall of the protective inner sleeve, and adjacent flame retardant strips are sequentially arranged close to each other without gaps; the cross section of the flame retardant strip is in a hemispherical shape; and a protective outer sleeve is arranged outside the flame-retardant strip. According to the invention, the plurality of flame-retardant strips are arranged between the inner protective sleeve and the outer protective sleeve, the flame-retardant strips can play a flame-retardant role, the plurality of flame-retardant strips are sequentially arranged in a close manner, the adjacent flame-retardant strips can play a role in isolating combustion, and the cross sections of the flame-retardant strips are in the shape of a hemisphere, so that the flame-retardant strips can be better fitted and matched with the outer wall surface of the inner protective sleeve, and meanwhile, the flame-retardant area is increased, thereby ensuring the flame-retardant property.
Description
Technical Field
The invention relates to the technical field of steel strands, in particular to an unbonded prestressed steel strand.
Background
The unbonded prestressed steel strand is mainly applied to post-tensioning construction of a prestressed structure, the unbonded prestressed steel strand means that after the prestressed steel strand applies prestress, no adhesive force exists between the prestressed steel strand and a reserved hole channel of the prestressed steel strand in a concrete member, the prestressed steel strand can slide, and the prestress is completely transmitted by anchorage devices at two ends.
The structure of the usually unbonded prestressed steel strand consists of a steel strand bundle, an inner coating (grease or wax) and a polyethylene sheath. Polyethylene is used as a general plastic with excellent comprehensive performance and is widely applied to the fields of automobiles, packaging, household appliances, electronic products, furniture and the like, however, the polyethylene is a flammable material, and once a fire disaster happens, the safety of the whole use of the unbonded prestressed steel strand is greatly reduced; some flame retardant structure designs in the prior art are not only complex in structure, but also high in cost and have no large-scale application value.
Disclosure of Invention
The invention aims to solve the technical problem of providing an unbonded prestressed steel strand which is simple in structure, low in production and manufacturing cost and good in flame retardant property.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an unbonded prestressed steel strand comprises a plurality of prestressed steel strand bundles, a protective inner sleeve and a protective outer sleeve; the prestressed steel strand bundles are all arranged in the protective inner sleeve, and an anticorrosive layer is filled in gaps among the prestressed steel strand bundles; a plurality of flame retardant strips are uniformly distributed along the longitudinal direction of the outer side wall of the protective inner sleeve, and adjacent flame retardant strips are sequentially arranged close to each other without gaps; the cross section of the flame retardant strip is in a hemispherical shape; and a protective outer sleeve is arranged outside the flame-retardant strip.
Preferably, the flame-retardant strip is made of a flame-retardant foaming material, and can be a foamed flame-retardant silica gel strip.
Preferably, the flame-retardant strip is bonded on the outer side wall of the protective inner sleeve through flame-retardant glue.
Preferably, the number of the steel strand bundles is 3 to 7.
Preferably, each of the steel strand bundles is formed by twisting 2, 3 or 7 steel wires.
Preferably, the protective inner sleeve and the protective outer sleeve are both made of low-smoke halogen-free flame-retardant polyolefin materials.
Preferably, the protective inner sleeve is made of polyvinyl chloride material; the protective outer sleeve is made of low-smoke halogen-free flame-retardant polyolefin material.
Preferably, the anticorrosive layer is anticorrosive grease or epoxy resin.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the unbonded prestressed steel strand, a protective inner sleeve and a protective outer sleeve are respectively arranged outside the prestressed steel strand bundle, and a plurality of flame retardant strips are arranged between the protective inner sleeve and the protective outer sleeve; through the design, the flame-retardant strips can play a flame-retardant role, and meanwhile, because the flame-retardant strips are sequentially arranged closely, the adjacent flame-retardant strips can play a role in isolating combustion, and because the cross section of each flame-retardant strip is in a hemispherical shape, on one hand, the flame-retardant strips can be better fitted and adapted with the outer wall surface of the protective inner sleeve, and on the other hand, the cross section of each flame-retardant strip is in a hemispherical shape, so that the flame-retardant area is increased, and the flame-retardant performance can be ensured.
(2) The invention has the advantages of simple structure, wide raw material source, low production and manufacturing cost and good flame retardant property, and is suitable for popularization and use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the structure of the flame retardant strip of the present invention.
In the figure, 1-prestressed steel strand bundle, 2-protective inner sleeve, 3-protective outer sleeve, 4-anticorrosive layer, 5-flame retardant strip and 6-protective outer sleeve.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, an unbonded prestressed steel strand comprises a plurality of prestressed steel strand bundles 1, an inner protective sleeve 2 and an outer protective sleeve 3; the prestressed steel strand bundles 1 are all arranged in the protective inner sleeve 2, and an anticorrosive layer 4 is filled in gaps among the prestressed steel strand bundles 1; a plurality of flame-retardant strips 5 are uniformly distributed along the longitudinal direction of the outer side wall of the protective inner sleeve 2, and the flame-retardant strips 5 are sequentially arranged in an abutting mode, namely, no gap is reserved between every two adjacent flame-retardant strips 5; the cross section of the flame-retardant strip 5 is hemispherical; and a protective outer sleeve 6 is arranged outside the flame-retardant strip 5.
Preferably, the flame-retardant strip 5 is made of a flame-retardant foaming material, and specifically, a foamed flame-retardant silica gel strip can be selected. Besides the conventional materials, the flame-retardant foaming material can be preferably selected from ultra-light, super-strong and high-flame-retardant polypropylene foam materials developed by Ningbo material technology of Chinese academy of sciences and Polymer industry of engineering research institute.
Preferably, the flame-retardant strip 5 is bonded to the outer side wall of the inner protective sleeve 2 through flame-retardant glue.
Preferably, the number of the steel strand bundles 1 is 3 to 7.
Preferably, each of the steel strand bundles 1 is formed by twisting 2, 3 or 7 steel wires.
Preferably, the protective inner sleeve 2 and the protective outer sleeve 6 are both made of low-smoke halogen-free flame-retardant polyolefin materials.
Preferably, the inner protective sleeve 2 is made of polyvinyl chloride material; the protective outer sleeve 6 is made of low-smoke halogen-free flame-retardant polyolefin material.
Preferably, the anticorrosive layer 4 is anticorrosive grease or epoxy resin.
The embodiment also provides a method for preparing the unbonded prestressed steel strand, which specifically comprises the following steps:
(1) firstly, stranding a plurality of steel wires to form a single steel strand bundle 1;
(2) coating special grease or wax or spraying epoxy resin on the outer part of the single steel strand bundle 1 in sequence;
(3) folding the single steel strand bundle 1 processed in the step, and extruding and molding the outside of the folded steel strand bundle 1 through an extruding machine to form a protective inner sleeve 2 so as to coat the plurality of steel strand bundles 1;
(4) sequentially bonding the flame-retardant strips 5 on the outer side wall of the protective inner sleeve 2 through flame-retardant glue on the outer side wall of the protective inner sleeve 2, wherein no gap is left between every two adjacent flame-retardant strips in the bonding process;
(5) and extruding and molding the outside of the bonded flame-retardant strip 5 by an extruding machine again to form the protective outer sleeve 3, thereby finishing the whole preparation process.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. The utility model provides an unbonded prestressing force steel strand which characterized in that: the device comprises a plurality of prestressed steel strand bundles (1), a protective inner sleeve (2) and a protective outer sleeve (3); the prestressed steel strand bundles (1) are all arranged in the protective inner sleeve (2), and an anticorrosive layer (4) is filled in gaps among the prestressed steel strand bundles (1); a plurality of flame retardant strips (5) are uniformly distributed along the longitudinal direction of the outer side wall of the protective inner sleeve (2), and adjacent flame retardant strips (5) are sequentially arranged close to each other without gaps; the cross section of the flame retardant strip (5) is hemispherical; and a protective outer sleeve (6) is arranged outside the flame-retardant strip (5).
2. The unbonded prestressed steel strand as claimed in claim 1, wherein: the flame-retardant strip (5) is made of a flame-retardant foam material.
3. The unbonded prestressed steel strand of claim 1 or 2, wherein: the flame-retardant strip (5) is bonded on the outer side wall of the protective inner sleeve (2) through flame-retardant glue.
4. The unbonded prestressed steel strand as claimed in claim 1, wherein: 3-7 steel strand bundles (1) are provided.
5. The unbonded prestressed steel strand as claimed in claim 4, wherein: each steel strand bundle (1) is formed by twisting 2, 3 or 7 steel wires.
6. The unbonded prestressed steel strand as claimed in claim 1, wherein: the protective inner sleeve (2) and the protective outer sleeve (6) are both made of low-smoke halogen-free flame-retardant polyolefin materials.
7. The unbonded prestressed steel strand as claimed in claim 1, wherein: the protective inner sleeve (2) is made of polyvinyl chloride material; the protective outer sleeve (6) is made of low-smoke halogen-free flame-retardant polyolefin material.
8. The unbonded prestressed steel strand as claimed in claim 1, wherein: the anticorrosive layer (4) is anticorrosive grease or epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911216036.2A CN110761099A (en) | 2019-12-02 | 2019-12-02 | Unbonded prestressed steel strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911216036.2A CN110761099A (en) | 2019-12-02 | 2019-12-02 | Unbonded prestressed steel strand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110761099A true CN110761099A (en) | 2020-02-07 |
Family
ID=69340588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911216036.2A Pending CN110761099A (en) | 2019-12-02 | 2019-12-02 | Unbonded prestressed steel strand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110761099A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4635433A (en) * | 1984-11-20 | 1987-01-13 | Kawasaki Steel Corporation | Unbonded PC steel strand |
| JP2001032443A (en) * | 1999-07-16 | 2001-02-06 | Hien Electric Industries Ltd | Partially unbonding prestressing steel stranded wire |
| JP2003003606A (en) * | 2001-06-20 | 2003-01-08 | Sumitomo Electric Ind Ltd | Unbonded covered pc-steel stranded wire |
| US6610399B1 (en) * | 2000-11-17 | 2003-08-26 | Structural Technologies, Llc | Multi-layer, thermal protection and corrosion protection coating system for metallic tendons, especially for external post-tensioning systems |
| CN207441306U (en) * | 2017-10-09 | 2018-06-01 | 贵州首为电线电缆有限公司 | A kind of increased electric wire of heat dissipation area |
| CN207733713U (en) * | 2017-12-28 | 2018-08-17 | 深圳优普泰服装科技有限公司 | The fabric of fire-fighting cooling |
| CN207818259U (en) * | 2018-03-08 | 2018-09-04 | 广州富羽电缆实业有限公司 | A kind of HYV types pvc sheath telephone wire |
| CN109102943A (en) * | 2018-08-27 | 2018-12-28 | 镇江华源晋昌电器有限公司 | A kind of high tenacity low resistance shielding waterproof cable |
| CN212077453U (en) * | 2019-12-02 | 2020-12-04 | 云南春鹏钢绞线有限公司 | Unbonded prestressed steel strand |
-
2019
- 2019-12-02 CN CN201911216036.2A patent/CN110761099A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4635433A (en) * | 1984-11-20 | 1987-01-13 | Kawasaki Steel Corporation | Unbonded PC steel strand |
| JP2001032443A (en) * | 1999-07-16 | 2001-02-06 | Hien Electric Industries Ltd | Partially unbonding prestressing steel stranded wire |
| US6610399B1 (en) * | 2000-11-17 | 2003-08-26 | Structural Technologies, Llc | Multi-layer, thermal protection and corrosion protection coating system for metallic tendons, especially for external post-tensioning systems |
| JP2003003606A (en) * | 2001-06-20 | 2003-01-08 | Sumitomo Electric Ind Ltd | Unbonded covered pc-steel stranded wire |
| CN207441306U (en) * | 2017-10-09 | 2018-06-01 | 贵州首为电线电缆有限公司 | A kind of increased electric wire of heat dissipation area |
| CN207733713U (en) * | 2017-12-28 | 2018-08-17 | 深圳优普泰服装科技有限公司 | The fabric of fire-fighting cooling |
| CN207818259U (en) * | 2018-03-08 | 2018-09-04 | 广州富羽电缆实业有限公司 | A kind of HYV types pvc sheath telephone wire |
| CN109102943A (en) * | 2018-08-27 | 2018-12-28 | 镇江华源晋昌电器有限公司 | A kind of high tenacity low resistance shielding waterproof cable |
| CN212077453U (en) * | 2019-12-02 | 2020-12-04 | 云南春鹏钢绞线有限公司 | Unbonded prestressed steel strand |
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