CN106088479B - A kind of processing method of prestressed high strength concrete steel reinforcement cage - Google Patents
A kind of processing method of prestressed high strength concrete steel reinforcement cage Download PDFInfo
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- CN106088479B CN106088479B CN201610669393.4A CN201610669393A CN106088479B CN 106088479 B CN106088479 B CN 106088479B CN 201610669393 A CN201610669393 A CN 201610669393A CN 106088479 B CN106088479 B CN 106088479B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Architecture (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of processing method of prestressed high strength concrete steel reinforcement cage, i.e. by interlaced equilateral triangle frame be the high-strength stirrup of support based on the integrally-built steel reinforcement cage with internal layer steel reinforcement cage and outside steel reinforcement cage, i.e. prestressed high strength concrete steel reinforcement cage；Main reinforcement is made of steel bar for prestressed concrete；Advantage is, since triangle has stability, is reinforced after loading onto two triangles staggeredly；The dome contacts that equilateral triangle is in contact with outer rectilineal hoop are equally distributed, can ensure that main reinforcement spacing is also uniform in this way；The steel reinforcement cage of processing and fabricating can greatly improve intensity from structure in this way；In addition the prestressed concrete steel stick prepared using special formula and processing technology, the intensity of its rod iron itself has been more than 2000MPa, elongation percentage is more than 7%, and there is preferable ductility and anti-delayed fracture characteristic, and manufacturing cost just corresponds to 1420MPa grades of prestressed concrete steel stick, and cost is greatly saved.
Description
Technical field
The present invention relates to building element technical field, especially a kind of processing side of prestressed high strength concrete steel reinforcement cage
Method.
Background technology
In bridges and culverts or high-building construction, need according to requiring to carry out basic piling, method is rushed with using machine
Hole and water mill drilling, and hole depth reaches design requirement, then transfers steel reinforcement cage to stake holes, is inserted into conduit progress concrete and pours
Note.It is also in this way, the reinforcing bar that generally this component periphery is arranged is pre- when concrete structure is column or strip component
It first makes, this is exactly steel reinforcement cage.Usually our bar constructions pre-productions such as cast-in-situ bored pile, caisson, columns
It is steel reinforcement cage.
There are insoluble problems for existing steel reinforcement cage, and regular reinforcement cage manufacture craft is simple, but intensity is not high, nothing
Method is applied to the high stake Beam of intensity requirement；And intensity wants high technique more complicated and of high cost.
It is especially difficult to ensure that the spacing of main reinforcement is uniform in prefabrication process, is deformed so as to cause steel reinforcement cage when filling stake,
Reduce pile pile intensity.
Invention content
Technical problem to be solved by the invention is to provide a kind of intensity height, manufacture craft is simple, consumptive material saves, processing efficiency
High prestressed concrete reinforcing steel cage.
In order to solve the above technical problems, the technical solution adopted in the present invention is a kind of prestressed high strength concrete reinforcing bar
The processing method of cage, it is characterised in that include the following steps.
(1) circular outer rectilineal hoop is made according to setting specification.
(2) equilateral triangle frame is made according to the specification of outer rectilineal hoop, enable three vertex of equilateral triangle frame and outer hoop
Muscle contacts.
(3) the reverse interleaved equilateral triangle frame of attaching two in outer rectilineal hoop, by the top of outer rectilineal hoop and equilateral triangle frame
It is named as dome contacts at point contact, six on outer rectilineal hoop dome contacts is made to be uniformly distributed.
By two equilateral triangle framves while with while crosspoint be named as cross-point, dome contacts and cross-point are carried out
Welding or binding, and reserved metal binding wire, make high-strength stirrup.
(5) multiple high-strength stirrups are taken, the bind main reinforcement on reserved metal binding wire, until each reserved metal binding wire
Binding finishes.
(6) continue to bind main reinforcement according to setpoint distance using each dome contacts as reference point on outer rectilineal hoop, make with outer shroud
Outer reinforcement cage based on stirrup.
(7) attaching ring-shaped stirrup in the main reinforcement by the bind inside outer reinforcement cage on cross-point, which is ordered
Entitled interior rectilineal hoop.
(8) continue to bind main reinforcement according to setpoint distance using each cross-point as reference point on interior rectilineal hoop, make with inner ring
Internal layer steel reinforcement cage based on stirrup.
Thus made by interlaced equilateral triangle frame be support high-strength stirrup based on have internal layer
The integrally-built steel reinforcement cage of steel reinforcement cage and outer reinforcement cage, i.e. prestressed high strength concrete steel reinforcement cage.
Further, wherein main reinforcement is made of steel bar for prestressed concrete.
The chemical component weight percentage of the prestressed concrete steel stick is：Carbon 0.33-0.43%, silicon 0.40-0.50%,
Manganese 0.71-0.73%, chromium 0.73-0.77%, molybdenum 0.31-0.33%, tungsten 0.35-0.55%, copper≤0.20%, phosphorus≤0.025%, sulphur≤
0.015%, lanthanide rare 0.11-0.13%, residual elements 0-0.05%, surplus are iron；The wherein constituent mass percentage of lanthanide rare
Than for lanthanum 15-19%, cerium 22-25%, praseodymium 23-26%, neodymium 17-19%, dysprosium 12-15%, remaining lanthanide series 3-4%, lanthanide rare is each
The sum of component is 100%.
The prestressed concrete steel stick makes with the following method.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 962-986 DEG C, heating temperature duration is kept 4-6 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 202-
216 DEG C/s, quenching 8-25s cooling time makes rod iron temperature be cooled to 12-22 DEG C of Ms points or less.
4. quenched rod iron is heated to 520-570 DEG C by tempering, 10-20s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, it is cooled to first with the cooling velocity of 2-3 DEG C/s with water-cooling method
355-365 DEG C, it is then air-cooled to 285-305 DEG C, then 235-245 DEG C is cooled to the cooling velocity of 2-3 DEG C/s with water-cooling method,
It is finally air-cooled to room temperature, obtains prestressed concrete steel stick.
Preparing the preferred method of prestressed concrete steel stick is.
Its chemical component weight percentage used for：Carbon 0.38%, silicon 0.45%, manganese 0.72%, chromium 0.75%, molybdenum 0.32%,
Tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, lanthanide rare 0.12%, residual elements 0-0.05%, surplus are iron；Wherein
The constituent mass percentage of lanthanide rare is lanthanum 17%, cerium 23.5%, praseodymium 24.5%, neodymium 18%, dysprosium 13.5%, remaining lanthanide series
3.5%。
Its preparation method used is.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 976 DEG C, heating temperature duration is kept 5 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 209
DEG C/s, 17s cooling time is quenched, rod iron temperature is made to be cooled to 17 DEG C of Ms points or less.
4. quenched rod iron is heated to 545 DEG C by tempering, 15s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, 360 are cooled to the cooling velocity of 2.5 DEG C/s with water-cooling method first
DEG C, 295 DEG C are then air-cooled to, then 240 DEG C are cooled to the cooling velocity of 2.5 DEG C/s with water-cooling method, are finally air-cooled to room temperature,
Obtain prestressed concrete steel stick.
The invention has the advantages that outer rectilineal hoop is built-in to have set two reverse interleaved equilateral triangle framves, due to triangle
Shape has stability, after loading onto two triangles staggeredly, more has stability；Equilateral triangle is in contact with outer rectilineal hoop
Dome contacts are equally distributed, can ensure that main reinforcement spacing is also uniform in this way；The steel reinforcement cage of processing and fabricating in this way can be from
Intensity is greatly improved in structure；In addition the prestressed concrete steel stick prepared using special formula and processing technology, rod iron
The intensity of itself has been more than 2000MPa, and elongation percentage is more than 7%, and has preferable ductility and anti-delayed fracture characteristic, and prepares
Cost just corresponds to 1420MPa grades of prestressed concrete steel stick, and cost is greatly saved.
Description of the drawings
Fig. 1 is the structural schematic diagram of prestressed high strength concrete steel reinforcement cage in the present invention.
Fig. 2 is the structural schematic diagram of high-strength stirrup in the present invention.
In figure：1. outer rectilineal hoop, 2. equilateral triangle framves, 3. dome contacts, 4. cross-points, 5. high-strength stirrups, 6. main reinforcements, 7.
Outer reinforcement cage, rectilineal hoop, 9. internal layer steel reinforcement cages in 8..
Specific implementation mode
With reference to embodiment, the invention will be further described, and following embodiment is intended to illustrate invention rather than to this
Further limiting for invention, should not be limited the scope of the invention with this.
Embodiment 1.
A kind of prestressed high strength concrete steel reinforcement cage is prepared, in accordance with the following steps processing and fabricating.
(1) circular outer rectilineal hoop 1 is made according to setting specification.
(2) make equilateral triangle frame 2 according to the specification of outer rectilineal hoop 1, enable three vertex of equilateral triangle frame 2 with it is outer
Rectilineal hoop 1 contacts.
(3) the reverse interleaved equilateral triangle frame 2 of attaching two in outer rectilineal hoop 1, by outer rectilineal hoop 1 and equilateral triangle frame 2
Apexes contact at be named as dome contacts 3, so that six on outer rectilineal hoop 1 dome contacts 3 is uniformly distributed.
By two equilateral triangle framves 2 while with while crosspoint be named as cross-point 4, dome contacts 3 and cross-point 4 are equal
It is welded or is bound, and reserved metal binding wire, make high-strength stirrup 5.
(5) multiple high-strength stirrups 5 are taken, the bind main reinforcement 6 on reserved metal binding wire, until each reserved binding steel
All binding main reinforcement 6 finishes silk.
On outer rectilineal hoop 1 with each dome contacts 3 be reference point according to setpoint distance continue bind main reinforcement 6, make with
Outer reinforcement cage 7 based on outer rectilineal hoop 1.
(7) attaching ring-shaped stirrup in the main reinforcement 6 by the bind inside outer reinforcement cage 7 on cross-point 4, by the circumferential band
Muscle is named as interior rectilineal hoop 8.
On interior rectilineal hoop 8 with each cross-point 4 be reference point according to setpoint distance continue bind main reinforcement 6, make with
Internal layer steel reinforcement cage 9 based on interior rectilineal hoop 8.
Thus made by interlaced equilateral triangle frame 2 be the high-strength stirrup 5 of support based on have it is interior
The integrally-built steel reinforcement cage of layer steel reinforcement cage 9 and outer reinforcement cage 7, i.e. prestressed high strength concrete steel reinforcement cage.
Its used main reinforcement material is all made of steel bar for prestressed concrete.
Rectilineal hoop is built-in outside the steel reinforcement cage made in this way has set two reverse interleaved equilateral triangle framves, since triangle has
There is stability, after loading onto two basic triangles, more there is stability；Equilateral triangle is contacted with what outer rectilineal hoop was in contact
Point is equally distributed, can ensure that main reinforcement spacing is also uniform in this way；The steel reinforcement cage of processing and fabricating is big from structure in this way
Improve intensity greatly.
Embodiment 2.
Prepare steel bar for prestressed concrete.
The chemical component weight percentage of the prestressed concrete steel stick is：Carbon 0.33%, silicon 0.40%, manganese 0.71%, chromium
0.73%, molybdenum 0.31%, tungsten 0.35%, copper 0.20%, phosphorus 0.025%, sulphur 0.015%, lanthanide rare 0.11%, residual elements 0-
0.05%, surplus is iron；Wherein the constituent mass percentage of lanthanide rare be lanthanum 15%, cerium 25%, praseodymium 23%, neodymium 19%, dysprosium 14%,
Remaining lanthanide series 4%.
The prestressed concrete steel stick makes with the following method.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 962 DEG C, heating temperature duration is kept 6 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 202
DEG C/s, 25s cooling time is quenched, rod iron temperature is made to be cooled to 12 DEG C of Ms points or less.
4. quenched rod iron is heated to 520 DEG C by tempering, 20s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, 355 are cooled to the cooling velocity of 2 DEG C/s with water-cooling method first
DEG C, 285 DEG C are then air-cooled to, then 235 DEG C are cooled to the cooling velocity of 2 DEG C/s with water-cooling method, are finally air-cooled to room temperature, obtain
To prestressed concrete steel stick.
Through examining, intensity is more than 2010MPa, and elongation percentage is more than 7%.
Embodiment 3.
Prepare prestressed concrete steel stick.
Its chemical component weight percentage used for：Carbon 0.38%, silicon 0.45%, manganese 0.72%, chromium 0.75%, molybdenum 0.32%,
Tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, lanthanide rare 0.12%, residual elements 0-0.05%, surplus are iron；Wherein
The constituent mass percentage of lanthanide rare is lanthanum 17%, cerium 23.5%, praseodymium 24.5%, neodymium 18%, dysprosium 13.5%, remaining lanthanide series
3.5%。
Its preparation method used is.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 976 DEG C, heating temperature duration is kept 5 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 209
DEG C/s, 17s cooling time is quenched, rod iron temperature is made to be cooled to 17 DEG C of Ms points or less.
4. quenched rod iron is heated to 545 DEG C by tempering, 15s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, 360 are cooled to the cooling velocity of 2.5 DEG C/s with water-cooling method first
DEG C, 295 DEG C are then air-cooled to, then 240 DEG C are cooled to the cooling velocity of 2.5 DEG C/s with water-cooling method, are finally air-cooled to room temperature,
Obtain prestressed concrete steel stick.
Through examining, intensity is more than 2100MPa, and elongation percentage is more than 7%.
Embodiment 4.
Prepare steel bar for prestressed concrete.
The chemical component weight percentage of the prestressed concrete steel stick is：Carbon 0.40%, silicon 0.48%, manganese 0.715%,
Chromium 0.76%, molybdenum 0.315%, tungsten 0.50%, copper 0.18%, phosphorus 0.015%, sulphur 0.015%, lanthanide rare 0.115%, residual elements 0-
0.05%, surplus is iron；Wherein the constituent mass percentage of lanthanide rare be lanthanum 19%, cerium 22%, praseodymium 26%, neodymium 17%, dysprosium 13%,
Remaining lanthanide series 3%.
The prestressed concrete steel stick makes with the following method.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 981 DEG C, heating temperature duration is kept 5 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 207
DEG C/s, 18s cooling time is quenched, rod iron temperature is made to be cooled to 19 DEG C of Ms points or less.
4. quenched rod iron is heated to 555 DEG C by tempering, 15s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, 359 are cooled to the cooling velocity of 2 DEG C/s with water-cooling method first
DEG C, 297 DEG C are then air-cooled to, then 242 DEG C are cooled to the cooling velocity of 3 DEG C/s with water-cooling method, are finally air-cooled to room temperature, obtain
To prestressed concrete steel stick.
Through examining, intensity is more than 2025MPa, and elongation percentage is more than 7%.
Embodiment 5.
Prepare steel bar for prestressed concrete.
The chemical component weight percentage of the prestressed concrete steel stick is：Carbon 0.43%, silicon 0.50%, manganese 0.73%, chromium
0.77%, molybdenum 0.33%, tungsten 0.55%, copper 0.20%, phosphorus 0.025%, sulphur 0.015%, lanthanide rare 0.13%, residual elements 0-
0.05%, surplus is iron；Wherein the constituent mass percentage of lanthanide rare be lanthanum 19%, cerium 25%, praseodymium 23%, neodymium 17%, dysprosium 12%,
Remaining lanthanide series 4%.
The prestressed concrete steel stick makes with the following method.
1. being smelted in steel mill according to weight percent and rolling into rod iron.
2. the rod iron rolled feeding induction heater is heated to 986 DEG C, heating temperature duration is kept 4 minutes.
3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quenching cooling velocity control is 216
DEG C/s, 8s cooling time is quenched, rod iron temperature is made to be cooled to 22 DEG C of Ms points or less.
4. quenched rod iron is heated to 570 DEG C by tempering, 10s is kept the temperature.
5. the rod iron after tempering is cooled to room temperature, 365 are cooled to the cooling velocity of 3 DEG C/s with water-cooling method first
DEG C, 305 DEG C are then air-cooled to, then 245 DEG C are cooled to the cooling velocity of 3 DEG C/s with water-cooling method, are finally air-cooled to room temperature, obtain
To prestressed concrete steel stick.
Through examining, intensity is more than 2055MPa, and elongation percentage is more than 7%.
Claims (2)
1. a kind of processing method of prestressed high strength concrete steel reinforcement cage, it is characterised in that include the following steps：(1) according to setting
Lattice of establishing rules make circular outer rectilineal hoop（1）；(2) equilateral triangle frame is made according to the specification of outer rectilineal hoop（2）, make equilateral triangle
Frame（2 ）Three vertex can be with outer rectilineal hoop（1）Contact；(3) in outer rectilineal hoop（1）Interior attaching two it is reverse interleaved positive three
Angular frame（2）, by outer rectilineal hoop（1）With equilateral triangle frame（2）Apexes contact at be named as dome contacts（3）, make outer rectilineal hoop
（1）On six dome contacts（3）It is uniformly distributed；(4) by two equilateral triangle framves（2）While with while crosspoint be named as staggeredly
Point（4）, by dome contacts（3）And cross-point（4）It is welded or is bound, and reserved metal binding wire, make high-strength stirrup
（5）；(5) multiple high-strength stirrups are taken（5）, the bind main reinforcement on reserved metal binding wire（6）, until each reserved binding steel
Silk binding finishes；(6) in outer rectilineal hoop（1）On with each dome contacts（3）Continue binding main reinforcement according to setpoint distance for reference point
（6）, rectilineal hoop other than making（1）Based on outer reinforcement cage（7）；(7) by outer reinforcement cage（7）Internal bind is staggeredly
Point（4）On main reinforcement（6）The ring-shaped stirrup is named as interior rectilineal hoop by upper attaching ring-shaped stirrup（8）；(8) in interior rectilineal hoop（8）
On with each cross-point（4）Continue binding main reinforcement according to setpoint distance for reference point（6）, rectilineal hoop within making（8）Based on
Internal layer steel reinforcement cage（9）.
2. the processing method of prestressed high strength concrete steel reinforcement cage according to claim 1, it is characterised in that main reinforcement is adopted
It is made of steel bar for prestressed concrete；The chemical component weight percentage that the prestressed concrete steel stick uses for：Carbon
0.38%, silicon 0.45%, manganese 0.72%, chromium 0.75%, molybdenum 0.32%, tungsten 0.45%, copper 0.15%, phosphorus 0.015%, sulphur 0.013%, group of the lanthanides
Rare earth 0.12%, residual elements 0-0.05%, surplus are iron；Wherein the constituent mass percentage of lanthanide rare is lanthanum 17%, cerium
23.5%, praseodymium 24.5%, neodymium 18%, dysprosium 13.5%, remaining lanthanide series 3.5%；The preparation side that the prestressed concrete steel stick uses
Method is：1. being smelted in steel mill according to weight percent and rolling into rod iron；2. the rod iron rolled feeding induction heater is heated to
976 DEG C, keep heating temperature duration 5 minutes；3. the rod iron that sensing heating is completed directly is carried out quenching treatment with quenching liquid, quench
Fiery cooling velocity control is 209 DEG C/s, and quenching 17s cooling time makes rod iron temperature be cooled to 17 DEG C of Ms points or less；4. will quenching
Rod iron afterwards is heated to 545 DEG C by tempering, keeps the temperature 15s；5. the rod iron after tempering is cooled to room temperature, water-cooling method is used first
360 DEG C are cooled to the cooling velocity of 2.5 DEG C/s, is then air-cooled to 295 DEG C, then with water-cooling method with the cooling speed of 2.5 DEG C/s
Degree is cooled to 240 DEG C, is finally air-cooled to room temperature, obtains prestressed concrete steel stick.
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| CN107217200A (en) * | 2017-06-22 | 2017-09-29 | 合肥汇之新机械科技有限公司 | A kind of deformed bar and its processing method |
| CN114016605A (en) * | 2021-12-29 | 2022-02-08 | 中铁建设集团有限公司 | Unequal-strength beam column joint based on ring rib constraint concrete superposed short column |
| CN115450376A (en) * | 2022-08-22 | 2022-12-09 | 华地恒工程咨询有限公司 | Combined steel structure high-strength concrete column structure |
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