Screw-thread steel bars for the prestressing of concrete（Precision rolled threaded steel ）

Threaded steel bars for prestressed concrete (also called precision rolled threaded steel) are large-diameter, high-strength, high-dimensional precision straight bars with discontinuous external threads rolled on the entire steel bar. The steel bar can be connected with a connector with an internal thread or anchored with a threaded nut at any cross section.

Finish-rolled threaded nut, also known as finished rolled threaded steel nut, is a high-strength Finish-rolled threaded nut. When in use, the force of the finish-rolled threaded nut is applied by applying pre-tension inside it, and then generating friction resistance on the contact surface between the connected parts to bear the external load. It is usually used in conjunction with a finished rolled threaded steel plate.

The finish-rolled threaded coupler refers to the precision-rolled threaded steel connector, which is a precision-rolled threaded steel anchor that can directly connect two steel bars together. It is an anchoring device used in prestressed concrete. It is an anchoring tool used in post-tensioned structures or components to maintain the tension of the prestressed tendons and transfer it to the inside of the concrete. It is also called a prestressed anchor.

Finished-rolled threaded backing plate, also known as finished rolled threaded steel plate, are an important part of the finished rolled threaded steel accessories anchor. They are used together with finished rolled nuts and are the most used part in the project. Finished-rolled threaded backing plate are divided into flat plate, conical plate and spherical plate. Flat plate are often used for fixed ends, and conical plate are often used for tensioning ends. The size of finished-rolled threaded backing plate can also be processed according to the requirements of relevant construction.

(Precision rolled threaded steel, Finish-rolled threaded nut, Finish-rolled threaded coupler, Finished-rolled threaded backing plate)

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ADVANTAGES

Characteristics of precision rolled threaded steel:

High strength: high yield strength and tensile strength, stable and reliable quality. Common strength grades include PSB785, PSB830, PSB930, PSB1080, etc., which can meet the needs of different large-scale projects.
High precision: high dimensional accuracy, uniform thread specifications, regular tooth shape, ensuring the reliability and construction accuracy of connection with anchors.
Good machinability: good cold bending and welding performance, convenient for cutting, bending and connection at the construction site. Save steel bars, reduce component area and weight.
Strong adaptability of connection method: simple connection and anchoring, strong adhesion, safe and reliable tension anchoring, and convenient construction.
High corrosion resistance: generally surface anti-corrosion treatment is carried out, such as galvanizing, plastic coating, etc., which can effectively resist external environmental erosion and extend service life.

USE

Application fields of finished rolled threaded steel bars：

Due to its high strength, high precision and fatigue resistance, the precision rolled rebar has a wide range of applications, mainly in the following key projects:

1. Prestressed concrete system

Bridge engineering: cable anchorage ends of cable-stayed bridges, suspenders of suspension bridges, and external prestressed tendons of continuous beam bridges.

Rail transit facilities: longitudinal tensioning tendons of high-speed rail sleepers, and connecting bolts of subway segments.

Large buildings: prestressed anchors of stadium domes and large-span beams of exhibition centers.

2. Heavy machinery and equipment systems

Engineering machinery: force transmission rods of shield machine propulsion systems, pressure bearing screws of hydraulic jacks.

Energy equipment: wind power tower anchor bolts, turbine main shaft fasteners.

Industrial equipment: heavy stamping machine base anchor bolts, port crane track fixings.

3. Special structure anchoring system

Nuclear power plant: containment prestressed steel bundles, reactor pressure vessel anchor rods.

Hydropower station/dam: gate hoist anchor bolts, high-strength tie rods for dam reinforcement.

Geological disaster protection: mountain slope anchor cables, prestressed anchor rods for tunnel support.

4. Transportation infrastructure system

Highway: sound barrier column foundation anchor rod, overpass expansion joint anchor.

Railway system: contact network pillar anchor bolt, track plate fine adjustment screw.

Cross-sea project: immersed tube tunnel pipe segment connection bolt, submarine pile foundation reinforcement tie rod.

5. Extreme environment engineering system

Corrosion-resistant scenario: coastal chemical facilities (epoxy resin coated fine rolled rebar), saline-alkali land bridge.

Low temperature environment: oil and gas pipeline support anchor bolts in high-cold areas (-50℃ low temperature toughness material).

Fatigue-resistant scenario: airport runway joint anchor (withstands high-frequency vibration of aircraft takeoff and landing).

SPECIFICATIONS

Product Parameters of precision rolled threaded steel
Nominal Diameter / mm	Level	Nominal cross-sectional area / mm²	Theoretical weight kg/m
Φ15	PSB830	177	1.4
Φ20	PSB500	314	2.47
Φ25	PSB500 / 830 / 930 / 1080	491	4.1
Φ32	PSB830 / 930 / 1080	804	6.65
Φ36	PSB830 / 930 / 1080	1080	8.41
Φ40	PSB830 / 930 / 1080	1257	10.34
Φ50	PSB830 / 930 / 1080	1963	16.28

Mechanical Properties：

Mechanical Properties
Diameter / mm	Cross-sectional area / mm	Weight Kg/m	PSB830				PSB930				PSB1080
			Min Yield Stress/Load		Min Ultimate Stress/Load		Min Yield Stress/Load		Min Ultimate Stress/Load		Min Yield Stress/Load		Min Ultimate Stress/Load
			Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN
15	177	1.4	830	147	1030	182	930	165	1080	191	1080	191	1230	218
20	314	2.47	830	261	1030	323	930	292	1080	339	1080	339	1230	386
25	491	4.1	830	408	1030	506	930	457	1080	530	1080	530	1230	604
32	804	6.65	830	667	1030	828	930	748	1080	868	1080	868	1230	989
36	1018	8.41	830	845	1030	1049	930	947	1080	1099	1080	1099	1230	1252
40	1257	10.34	830	1043	1030	1295	930	1169	1080	1358	1080	1358	1230	1546
50	1963	16.28	830	1629	1030	2022	930	1826	1080	2120	1080	2120	1230	2414
Elongation at fracture A / %			≥7				≥7				≥6
Total Elongation at max force Agt / %			≥3.5
Relaxation at 1000h			≤4
Modulus of elasticity / Mpa			2 x 10⁵

PACKAGE

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