CN108252133B - Super-large-specification low-relaxation prestressed steel strand and manufacturing method thereof - Google Patents
Super-large-specification low-relaxation prestressed steel strand and manufacturing method thereof Download PDFInfo
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- CN108252133B CN108252133B CN201711292886.1A CN201711292886A CN108252133B CN 108252133 B CN108252133 B CN 108252133B CN 201711292886 A CN201711292886 A CN 201711292886A CN 108252133 B CN108252133 B CN 108252133B
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- 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
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- 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
- D07B1/0673—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a rope configuration
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2009—Wires or filaments characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2038—Strands characterised by the number of wires or filaments
- D07B2201/2039—Strands characterised by the number of wires or filaments three to eight wires or filaments respectively forming a single layer
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Abstract
The invention belongs to the technical field of prestressed steel strands, and the prestressed steel strands comprise a center wire and six outer layer side wires, wherein the diameter of the center wire is 8.16-8.26 mm, the diameter of each outer layer side wire is 7.78-7.88 mm, the enlargement ratio of the center wire is 4-6%, the nominal diameter of the twisted outer layer side wire and the twisted center wire is 23.6mm, the manufacturing method of the oversized low-relaxation prestressed steel strand comprises stabilizing treatment under drawing, twisting and tension tempering, the drawing force value of the center wire after drawing is more than or equal to 96.82 kilonewtons, the drawing force value of the outer layer side wire after drawing is more than or equal to 88.60 kilonewtons, the tensile strength of the twisted and stabilized oversized low-relaxation prestressed steel strand is more than or equal to 1770MPa, the maximum force is more than or equal to 602.00 kilonewtons, the total elongation of the maximum force reaches more than 4.5%, and the 1000-hour relaxation value is less than 2.5%.
Description
Technical Field
The invention belongs to the technical field of prestressed steel strands, and relates to a steel strand with a 1 x 7 structure, in particular to an oversized low-relaxation prestressed steel strand and a manufacturing method thereof.
Background
The prestressed construction technology is rapidly developed in the application fields of highways, intercity fast railways, super high-rise buildings, hydraulic and hydroelectric engineering, nuclear power station engineering, coal mining and the like, and in some fields, the prestressed rock-soil anchoring technology is required to be used for slope reinforcement, geological disaster protection, deep foundation pit excavation, iron (public) road tunnels and coal mining tunnel support.
The prestressed steel strand is mainly used for railway and highway bridges, long-span cable-stayed bridges, mine roadway support and rock-soil anchoring engineering. The requirements for the size and the bearing capacity of the steel strand are getting larger and larger. The national standard GB/T5224-2014 steel strand for prestressed concrete, the maximum specification of a 1 x 7 structure is regulated to phi 21.6 mm, and the standard of each international country is only regulated to phi 17.8 mm. Therefore, the construction and development of engineering projects with complex construction technical conditions and high requirements on overlarge bearing capacity are restricted.
At present, prestressed steel strands with a 1 x 7 structure are generally adopted in the field of prestressed building engineering in China, and only part of the field of coal mine support adopts steel strands with a 1 x 19 structure. Because the 1 multiplied by 19 structural steel strand is composed of three layers of multi-wire structures, the matching between the steel wire and the matching between the steel wire and the anchor clamp have certain technical defects in the manufacturing and construction processes of products, and the sliding of the steel wire is easily caused after the steel wire is subjected to tensile force, so that the whole bearing capacity of the prestressed component is reduced, and the construction quality is influenced. The industry is doing technical research and development work in this respect, and there is a certain time and a certain day before the ideal state of use is reached. This limits the application and development of the 1 × 19 structural steel strand in the field of construction engineering to some extent.
Therefore, prestressed steel strands with a 1 × 7 structure are mostly used in building engineering, and the prestressed steel strands with ultra-large specification, high bearing capacity, high elongation force and low relaxation are still the current and future development directions and mainstream. At present, the maximum specification of the prestressed steel strand with the 1 × 7 structure is 21.6 mm, most manufacturers cannot produce products with the specification of phi 21.6 mm or above due to the limitation of production equipment, and the specification strength of the common YL82B raw material is difficult to ensure that the tensile strength of a finished product with the specification of phi 21.6 mm reaches 1770MPa level and the actual maximum force can only reach 510kN at the rolling level of the existing raw material. At present, the phi 21.6 mm with the largest specification of a 1 multiplied by 7 structure hardly meets the requirement of the prestressed construction technology with super large bearing capacity.
The steel strand is formed by twisting 7 steel wires into a strand on a machine at one time according to a regulation mode and simultaneously carrying out stabilization treatment. Each steel wire is subjected to surface treatment, drawing, twisting and stabilizing treatment to obtain the steel wire with the advantages of high tensile strength, higher ductility, low relaxation, high bearing capacity, high elongation and long service life in severe conditions, and the steel wire is applied to the industries of super-large span bridge construction, building engineering, ultra-deep coal mine roadway support and the like. At present, the process of steel strand wires is as follows: the method comprises the steps of determining raw materials, drawing the raw materials, twisting the steel wires, stabilizing the tempering under tension, and cooling the water, wherein in the process, chemical components of the raw materials need to be designed elaborately, and the structural sizes of the steel wires forming the steel strand need to be designed, so that gaps exist among the twisted steel wires forming the steel strand, and the twisted steel wires are tight and not loose. And the process parameters in each step need to be tested repeatedly to obtain the most preferable scheme, but the existing process has the following problems, such as: the rolling level of raw materials is not high, so that the structural state of a large-specification (ordinary YL82B phi 14.0 mm) wire rod is not ideal, the original tensile strength cannot meet the requirement, the drawing strengthening coefficient is not high, the tensile strength of a steel wire is low, the drawing process parameter design of the raw materials is rough, or the improper selection of the stabilization parameter after twisting is caused, so that the finished product of the steel strand with the ultra-large specification has the defects of untight structure, reduced tensile strength, unsatisfactory relaxation performance or low relaxation performance and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an oversized low-relaxation prestressed steel strand with a 1 x 7 structure, a phi 23.6mm oversized specification, high tensile strength of a finished product and large bearing capacity and a manufacturing method thereof.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
super large specification low relaxation prestressing force steel strand, including a center wire and six outer layer limit silks, its characterized in that: the six outer layer side wires are wound on the outer edge of the center wire in an anticlockwise winding mode, the six outer layer side wires are wound around the center wire in a one-step stranding mode at the same synchronous twisting distance, the diameter of the center wire is 8.16-8.26 mm, the diameter of each outer layer side wire is 7.78-7.88 mm, the increasing ratio of the center wire is 4% -6%, gaps among the side wires are 0.2-0.3 mm, the outer contour of the center wire is in line contact with the six outer layer side wires, and the nominal diameter of the stranded outer layer side wires and the twisted center wire is 23.6 mm;
aiming at the manufacturing method of the ultra-large-specification low-relaxation prestressed steel strand, the manufacturing method comprises the steps of drawing, twisting and stabilizing treatment under tension tempering;
the drawing comprises the following steps:
(1) adopting a steel with the model number of YL85B-SD, and adding 0.05-0.15% of vanadium and 0.10-0.15% of molybdenum into the YL85B-SD steel to serve as a raw material wire rod;
the raw material wire rod comprises the following chemical components in percentage by mass:
C：0.83～0.87％Si：0.12～0.30％Mn：0.60～0.90％P：≤0.025％
S:≤0.025％Cr:≤0.35％Cu:≤0.20％Ni:≤0.10％V：0.05～0.15％
Mo：0.10～0.15％；
the raw material wire rod is a microalloyed cold and hot controlled rolling wire rod, and the diameter specification is determined to be phi 16.0 mm; the tensile strength of the raw material wire rod is more than or equal to 1250 MPa;
(2) a nine-tank continuous drawing machine is adopted, each pass of wire drawing tank body is driven by a motor with the rated power of more than 130kW, the central wire and the outer layer side wire are respectively drawn, and the outer layer side wire is drawn to 7.78-7.88 mm from 16.0 mm through eight passes; drawing the central wire from 16.0 mm to 8.16-8.26 mm through seven passes;
(3) the tensile strength of the central wire after being drawn reaches 1820MPa, and the tensile strength of the outer layer edge wire after being drawn needs 1840 MPa;
the maximum production capacity of the adopted equipment is phi 28.6 mm, the power of the medium-frequency induction furnace is 800kW after stabilization treatment, and the maximum force of a tension system is 500 kN; the twist and tempering under tension are stabilized, the twist pitch is 283-330 mm, the tempering temperature is 385-395 ℃, and the clamping tension is 260-270 kilonewtons.
Furthermore, the method for manufacturing an oversized low-relaxation prestressed steel strand as recited in claim 2, wherein: the tensile value of the central wire after being drawn is more than or equal to 96.82 kilonewtons, the tensile value of the outer layer side wire after being drawn is more than or equal to 88.60 kilonewtons, the tensile strength of the ultra-large-specification low-relaxation prestressed steel strand after twisting and stabilizing treatment is more than or equal to 1770MPa, the maximum force is more than or equal to 602.00 kilonewtons, the total elongation of the maximum force reaches more than 4.5%, and the relaxation value in 1000 hours is less than 2.5%.
The invention has the advantages and positive effects that:
the steel strand wire comprises a central wire and six outer layer side wires, wherein the six outer layer side wires are wound on the outer edge of the central wire in an anticlockwise mode, the six outer layer side wires are wound around the central wire in a synchronous and same-twisting distance and are formed in a one-time stranding mode, the diameter of the central wire is 8.16-8.26 mm, the diameter of each outer layer side wire is 7.78-7.88 mm, the nominal diameter of the stranded outer layer side wire and the stranded central wire after twisting is 23.6mm, the structure and the size of the central wire and the outer layer side wires are adopted, the central wire is enlarged by 4% -6%, gaps among the side wires are kept between 0.2 mm and 0.3 mm, the outer contour of the central wire is in line contact with the six outer layer side wires, and the steel wires forming the steel strand after twisting are not loose, and are not tight; the method comprises the steps of selecting microalloyed YL85B-SD wire rods with raw material brands containing 0.05-0.15% of vanadium and 0.10-0.15% of molybdenum, the specification of the raw material wire rods is 16.0 mm, the original tensile strength of the raw material wire rods is more than or equal to 1250MPa, selecting equipment capable of meeting drawing of ultra-large specification wire rods in drawing treatment, selecting 130kW drawing equipment with rated power of a wire drawing tank motor and elaborately designed drawing parameters, and matching parameters such as clamping tension and the like through the designed temperature and during stabilization treatment of tempering under the tension after twisting, wherein the prepared finished product is uniform and compact, and is tidy in wire arrangement and not loose; through the matching of the wire rods and the process, the manufactured steel strand has the diameter of more than or equal to 23.6mm, the tensile strength of more than or equal to 1770MPa, the breaking tension of more than or equal to 602kN, the maximum force total elongation of more than 4.5 percent, higher extensibility, 1000-hour relaxation value of less than 2.5 percent, large bearing capacity and long service life.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The invention discloses a 1 x 7 phi 23.6-specification ultra-large-specification low-relaxation prestressed steel strand, which comprises a central wire 2 and six outer layer side wires 1, and is characterized in that the six outer layer side wires are wound on the outer edge of the central wire in an anticlockwise mode, the six outer layer side wires are wound around the central wire in a one-time stranding mode at the same synchronous twisting distance, the diameter of the central wire is 8.16-8.26 mm, the diameter of each outer layer side wire is 7.78-7.88 mm, the increasing ratio of the central wire is 4-6%, the gap alpha between the side wires is 0.2-0.3 mm, the outer contour of the central wire is in line contact with the six outer layer side wires, and the nominal diameter phi of the twisted outer layer side wires and the twisted central wire is 23.6 mm;
the manufacturing method of the ultra-large-specification low-relaxation prestressed steel strand with the specification of 1 x 7-phi 23.6mm comprises the steps of drawing, twisting and stabilizing treatment under tension tempering;
the drawing comprises the following steps:
(1) adopting a steel with the model number of YL85B-SD, and adding 0.05-0.15% of vanadium and 0.10-0.15% of molybdenum into the YL85B-SD steel to serve as a raw material wire rod;
the raw material wire rod comprises the following chemical components in percentage by mass:
C：0.83～0.87％Si：0.12～0.30％Mn：0.60～0.90％P：≤0.025％
S:≤0.025％Cr:≤0.35％Cu:≤0.20％Ni:≤0.10％V：0.05～0.15％
Mo：0.10～0.15％；
the raw material wire rod is a microalloyed cold and hot controlled rolling wire rod, and the diameter specification is determined to be phi 16.0 mm; the tensile strength of the raw material wire rod is more than or equal to 1250 MPa;
(2) a nine-tank continuous drawing machine is adopted, each pass of wire drawing tank body is driven by a motor with the rated power of more than 130kW, the central wire and the outer layer side wire are respectively drawn, and the outer layer side wire is drawn to 7.78-7.88 mm from 16.0 mm through eight passes; drawing the central wire from 16.0 mm to 8.16-8.26 mm through seven passes;
(3) the tensile strength of the central wire after being drawn reaches 1820MPa, and the tensile strength of the outer layer edge wire after being drawn needs 1840 MPa;
the maximum production capacity of the adopted equipment is phi 28.6 mm, the power of the medium-frequency induction furnace is 800kW after stabilization treatment, and the maximum force of a tension system is 500 kN; the twist and tempering under tension are stabilized, the twist pitch is 283-330 mm, the tempering temperature is 385-395 ℃, and the clamping tension is 260-270 kilonewtons.
In the oversized steel strand, the increasing ratio of the central wire is 4-6%, the gaps alpha between the side wires are 0.2-0.3 mm, the outer contour of the central wire is in line contact with six outer layer side wires, and the nominal diameter phi of the twisted outer layer side wires and the twisted central wire is 23.6 mm.
In this embodiment, the tensile value after the central wire is drawn is greater than or equal to 96.82 kn, the tensile value after the outer layer side wire is drawn is greater than or equal to 88.60 kn, the tensile strength of the ultra-large-specification low-relaxation prestressed steel strand after twisting and stabilizing treatment is greater than or equal to 1770mpa, the maximum force is greater than or equal to 602.00 kn, the maximum force total elongation reaches more than 4.5%, and the 1000-hour relaxation value is less than 2.5%.
Claims (2)
1. Super large specification low relaxation prestressing force steel strand, including a center wire and six outer layer limit silks, its characterized in that: the six outer layer side wires are wound on the outer edge of the central wire in an anticlockwise winding mode, the six outer layer side wires are wound around the central wire in a one-step stranding mode at the same synchronous twisting distance, the diameter of the central wire is 8.16-8.26 mm, the diameter of each outer layer side wire is 7.78-7.88 mm, the increasing ratio of the central wire is 4% -6%, gaps among the side wires are 0.2-0.3 mm, the outer contour of the central wire is in line contact with the six outer layer side wires, and the nominal diameter of the stranded outer layer side wires and the stranded central wire is 23.6 mm;
the manufacturing method of the ultra-large-specification low-relaxation prestressed steel strand comprises the steps of drawing, twisting and stabilizing treatment under tension tempering;
the drawing comprises the following steps:
(1) adopting a steel with the model number of YL85B-SD, and adding 0.05-0.15% of vanadium and 0.10-0.15% of molybdenum into the YL85B-SD steel to serve as a raw material wire rod;
the raw material wire rod comprises the following chemical components in percentage by mass:
C：0.83～0.87％Si：0.12～0.30％Mn：0.60～0.90％P：≤0.025％
S:≤0.025％Cr:≤0.35％Cu:≤0.20％Ni:≤0.10％V：0.05～0.15％
Mo：0.10～0.15％；
the raw material wire rod is a microalloyed cold and hot controlled rolling wire rod, and the diameter specification is determined to be phi 16.0 mm; the tensile strength of the raw material wire rod is more than or equal to 1250 MPa;
(2) a nine-tank continuous drawing machine is adopted, each pass of wire drawing tank body is driven by a motor with the rated power of more than 130kW, the central wire and the outer layer side wire are respectively drawn, and the outer layer side wire is drawn to 7.78-7.88 mm from 16.0 mm through eight passes; drawing the central wire from 16.0 mm to 8.16-8.26 mm through seven passes;
(3) the tensile strength of the central wire after being drawn reaches 1820MPa, and the tensile strength of the outer layer edge wire after being drawn needs 1840 MPa;
the maximum production capacity of the adopted equipment is phi 28.6 mm, the power of the medium-frequency induction furnace is 800kW after stabilization treatment, and the maximum force of a tension system is 500 kN; the twist pitch of the stabilizing treatment of twisting and tempering under tension is 283-330 mm, the tempering temperature is 385-395 ℃, and the clamping tension is 260-270 kilonewtons;
in the oversized steel strand, the increasing ratio of the central wire is 4-6%, the gaps alpha between the side wires are 0.2-0.3 mm, the outer contour of the central wire is in line contact with six outer layer side wires, and the nominal diameter phi of the twisted outer layer side wires and the twisted central wire is 23.6 mm.
2. The method for manufacturing the ultra-large-specification low-relaxation prestressed steel strand as recited in claim 1, wherein: the tensile value of the central wire after being drawn is more than or equal to 96.82 kilonewtons, the tensile value of the outer layer side wire after being drawn is more than or equal to 88.60 kilonewtons, the tensile strength of the ultra-large-specification low-relaxation prestressed steel strand after twisting and stabilizing treatment is more than or equal to 1770MPa, the maximum force is more than or equal to 602.00 kilonewtons, the total elongation of the maximum force reaches more than 4.5%, and the relaxation value in 1000 hours is less than 2.5%.
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| WO2020083893A1 (en) * | 2018-10-23 | 2020-04-30 | Bekaert Advanced Cords Aalter Nv | Steel wire rope, coated steel wire rope and belt comprising steel wire rope |
| CN109338770B (en) * | 2018-12-11 | 2021-12-07 | 天津市新天钢中兴盛达有限公司 | Super-extra-high-strength galvanized steel strand for long-span transmission line |
| CN109604368B (en) * | 2018-12-11 | 2021-06-08 | 天津市新天钢中兴盛达有限公司 | Super-high-strength galvanized steel wire for overhead conductor and manufacturing method thereof |
| CN109853274A (en) * | 2018-12-26 | 2019-06-07 | 天津冶金钢线钢缆集团有限公司 | HDPE hot dip allumen prestress wire production technology |
| CN109930407A (en) * | 2019-04-17 | 2019-06-25 | 安徽省力通稀土钢缆有限公司 | A kind of production technology of corrosion prevention oiling PC steel strand wires |
| CN114350913A (en) * | 2021-12-27 | 2022-04-15 | 江苏省沙钢钢铁研究院有限公司 | A kind of steel strand stabilization treatment process and treated steel strand |
| CN114561821B (en) * | 2022-04-28 | 2022-07-26 | 天津市新天钢中兴盛达有限公司 | Super-large-diameter steel strand for mine anchor cable and manufacturing method thereof |
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| CN2380595Y (en) * | 1999-06-29 | 2000-05-31 | 虞德顺 | Prestressed prickly steel twisted line |
| CN201901794U (en) * | 2010-06-28 | 2011-07-20 | 天津冶金集团中兴盛达钢业有限公司 | Ultra low relaxation prestress steel strand with multi-layer wires |
| CN103639231B (en) * | 2013-11-21 | 2015-12-02 | 江苏天舜金属材料集团有限公司 | A kind of manufacture method of chrome molybdenum low-alloy galvanized strand wires |
| CN103938071A (en) * | 2014-04-30 | 2014-07-23 | 武汉钢铁(集团)公司 | Wire for stranded galvanized steel wire and production method of wire |
| CN104451434B (en) * | 2014-11-07 | 2017-09-01 | 罗拉斯光电科技有限公司 | A kind of strong corrosion resistant galvanized strand wires and its manufacture method |
| CN105401473B (en) * | 2015-11-26 | 2018-03-13 | 天津冶金集团中兴盛达钢业有限公司 | A kind of manufacture method of pre-stressed galvanized steel strand |
| CN105312341A (en) * | 2015-12-02 | 2016-02-10 | 贵州钢绳股份有限公司 | Production process of high-strength pre-stressed steel strands |
| CN106216427A (en) * | 2016-08-02 | 2016-12-14 | 贵州钢绳股份有限公司 | The production method of 1 × 7 21.6mm, 1860MPa high strength steel strand |
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Address after: 301616 No.1, No.1 Road, Jinghai Economic Development Zone (North District), Jinghai District, Tianjin Patentee after: Tianjin new Tiangang Zhongxing Shengda Co.,Ltd. Address before: 301616 No.1, No.1 Road, economic development zone (North District), Jinghai District, Tianjin Patentee before: TIANJIN METALLURGICAL GROUP FLOURISH STEEL INDUSTRIAL Co.,Ltd. |