Introduction of High strength bolts:
High strength bolts are made of high strength materials. The screw, nut and washer of the high-strength bolt are made of high-strength steel.
High-strength bolts are a type of fastener commonly used in the construction of steel structures, such as bridges, buildings, and industrial facilities. These bolts are designed to provide a strong, reliable connection between structural steel members, ensuring the overall stability and integrity of the structure.
Applications of high-strength bolts:
Structural Steel Framing:
High-strength bolts are extensively used to connect steel beams, columns, and other structural members in the construction of steel-framed buildings, bridges, and industrial facilities.
They provide the necessary strength and rigidity to the structural connections, ensuring the overall stability and load-bearing capacity of the building or structure.
Bridge Construction:
High-strength bolts are critical components in the construction and repair of bridges, where they are used to connect the various steel elements of the bridge superstructure and substructure.
| Class 8.8 high strength bolt construction torque value reference table |
| S.Q | Bolt specification | Bolt performance class | Standard value of construction pre-tension (KN) | Torque coefficient (standard deviation less than or equal to 0.010) | Initial torque (N*m) | Final torque (N*m) | Measured torque coefficient | Final torque (N*m) |
| 1 | M16 | 8.8s | 75 | 0.11~0.15 | 78 | 132~180 | 0.121 | 145 |
| 2 | M20 | 8.8s | 120 | 0.11~0.15 | 156 | 264~360 | 0.123 | 295 |
| 3 | M22 | 8.8s | 150 | 0.11~0.15 | 215 | 363~495 | 0.125 | 413 |
| 4 | M24 | 8.8s | 170 | 0.11~0.15 | 265 | 448.8~612 | 0.125 | 510 |
| 5 | M27 | 8.8s | 225 | 0.11~0.15 | 395 | 668.3~911.3 | 0.125 | 759 |
| 6 | M30 | 8.8s | 275 | 0.11~0.15 | 536 | 907.5~1237.5 | 0.125 | 1031 |
| Class 10.9 high strength bolt construction torque value reference table |
| S.Q | Bolt specification | Bolt performance class | Standard value of construction pre-tension (KN) | Torque coefficient (standard deviation less than or equal to 0.010) | Initial torque (N*m) | Final torque (N*m) | Measured torque coefficient | Final torque (N*m) |
| 1 | M16 | 10.9s | 110 | 0.11~0.15 | 114 | 193.6~264 | 0.122 | 215 |
| 2 | M20 | 10.9s | 170 | 0.11~0.15 | 221 | 374~510 | 0.12 | 408 |
| 3 | M22 | 10.9s | 210 | 0.11~0.15 | 300 | 508.2~693 | 0.126 | 582 |
| 4 | M24 | 10.9s | 250 | 0.11~0.15 | 390 | 660~900 | 0.125 | 750 |
| 5 | M27 | 10.9s | 320 | 0.11~0.15 | 562 | 950.4~1296 | 0.125 | 1080 |
| 6 | M30 | 10.9s | 390 | 0.11~0.15 | 761 | 1287~1755 | 0.125 | 1463 |
High strength bolts transmit external forces by applying pretension and friction.
High strength bolts are generally used for permanent connections.
High-strength bolt connection has the advantages of simple construction, good mechanical performance, disassembly, fatigue resistance, and no loosening under dynamic load, so it is a promising connection method.
Evercross Steel Bridges Overview :
| EVERCROSS STEEL BRIDGE SPECIFICATION |
EVERCROSS
STEEL BRIDGE | Bailey bridge(Compact-200, Compact-100, LSB, PB100, China-321,BSB)
Modular bridge( GWD, Delta, 450-type,etc),
Truss Bridge,Warren bridge,
Arch bridge, Plate bridge,Beam bridge,Box girder bridge,
Suspension bridge,Cable-stayed bridge,
Floating bridge,etc |
| DESIGN SPANS | 10M TO 300M Single span |
| CARRIAGE WAY | SINGLE LANE, DOUBLE LANES,MULTILANE,WALKWAY,ETC |
| LOADING CAPACITY | AASHTO HL93.HS15-44,HS20-44,HS25-44,
BS5400 HA+20HB,HA+30HB,
AS5100 Truck-T44,
IRC 70R Class A/B,
NATO STANAG MLC80/MLC110.
Truck-60T,Trailer-80/100Ton,etc |
| STEEL GRADE | EN10025 S355JR S355J0/EN10219 S460J0/EN10113 S460N/BS4360 Grade 55C
AS/NZS3678/3679/1163/Grade 350,
ASTM A572/A572M GR50/GR65
GB1591 GB355B/C/D/460C,etc |
| CERTIFICATES | ISO9001, ISO14001,ISO45001,EN1090,CIDB,COC,PVOC,SONCAP,etc |
| WELDING | AWS D1.1/AWS D1.5
AS/NZS 1554 or equivalent |
| BOLTS | ISO898,AS/NZS1252,BS3692 or equivalent |
| GALVANIZATION CODE | ISO1461
AS/NZS 4680
ASTM-A123,
BS1706
or equivalent
|
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Crafting And Engineering Grade 8.8 Bolts High Strength Construction Company Images
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