Segment Tunnel Arc Bolt
The Segment Tunnel Arc Bolt is specifically designed for connecting individual segments within a tunnel's arched structure. These bolts typically feature unique shapes and sizes to accommodate the specific requirements of arched structures. Their primary function is to ensure the safety and stability of the tunnel's overall structure.
Segment Tunnel Arc Bolt Specification
| Dimension | Arc Length mm | Tensile Strength | Surface Treatment |
|---|---|---|---|
| M25～M39 | 480～880 | 4.6,4.8,5.6,5.8,8.8 | Dacromet, Hot dip Galvanized |
Segment Tunnel Arc Bolt Application
The application of Segment Tunnel Arc Bolts is integral to the construction and stability of tunnels. These specialized bolts play a critical role in connecting and securing segments that form the structural components of a tunnel, particularly those with an arched design. Assembled into a circular cylindrical pipeline, these bolts contribute significantly to the overall strength and integrity of the tunnel walls.
Tunnel Segment Bolt Mechanical Property
| Tunnel Segment Bolt | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mechanical and Physical Properties | Performance Level | ||||||||||||
| 3.6 | 4.6 | 4.8 | 5.6 | 5.8 | 6.8 | 8.8 | 9.8 | 10.9 | 12.9 | ||||
| d≤163) | d＞163) | ||||||||||||
| Nominal Tensile Strength | N/mm2 | 300 | 400 | 500 | 600 | 800 | 800 | 900 | 1000 | 1200 | |||
| Minimum tensile strength | N/mm2 | 330 | 400 | 420 | 500 | 520 | 600 | 800 | 830 | 900 | 1040 | 1220 | |
| Vickers hardness HV F≥98N | min | 95 | 120 | 130 | 155 | 160 | 190 | 250 | 255 | 290 | 320 | 385 | |
| max | 2206) | 250 | 320 | 335 | 360 | 380 | 435 | ||||||
| Brinell hardness HB F=30 D2 | min | 90 | 114 | 124 | 147 | 152 | 181 | 238 | 242 | 276 | 304 | 366 | |
| max | 2096) | 238 | 304 | 318 | 342 | 361 | 414 | ||||||
| Rockwell hardness HR | min | HRB | 52 | 67 | 71 | 79 | 82 | 89 | / | / | / | / | / |
| HRC | / | / | / | / | / | / | 22 | 23 | 28 | 32 | 39 | ||
| max | HRB | 95.06) | 99.5 | / | / | / | / | / | |||||
| HRC | / | 32 | 34 | 37 | 39 | 44 | |||||||
| Surface hardness HV 0.3 max | / | 7) | |||||||||||
| Yield point N/mm2 | Nominal | 180 | 240 | 320 | 300 | 400 | 480 | / | / | / | / | / | |
| min | 190 | 240 | 340 | 300 | 420 | 180 | / | / | / | / | / | ||
| Specified non-proportional elongation stress N/mm2 | Nominal | / | / | 640 | 640 | 720 | 900 | 1080 | |||||
| min | / | / | 640 | 660 | 720 | 940 | 1100 | ||||||
| Guaranteed stress N/mm2 | 0.94 | 0.94 | 0.91 | 0.93 | 0.9 | 0.92 | 0.91 | 0.91 | 0.90 | 0.88 | 0.88 | ||
| 180 | 225 | 310 | 280 | 380 | 440 | 580 | 600 | 650 | 830 | 970 | |||
| Breaking torque MB,N.m min | / | according to GB/T3098.13 regulations | |||||||||||
| Elongation after breaking % min | 25 | 22 | / | 20 | / | / | 12 | 12 | 10 | 9 | 8 | ||
| rate of reduction in area % min | / | 52 | 48 | 48 | 44 | ||||||||
| Shock absorption work Aku,min | 25 | 30 | 30 | 25 | 20 | 15 | |||||||
| Head firmness | No break | ||||||||||||
| Minimum height of undecarburized thread E | / | 1/2H1 | 2/3H1 | 3/4H1 | |||||||||
| Maximum depth of fully decarburized layer G,mm | / | 0.015 | |||||||||||
| Hardness after tempering | / | The difference between the average hardness before and after tempering is not more than 20HV | |||||||||||
| Surface defects | According to GB/T 5779.1 or GB/T 5779.3 regulations | ||||||||||||
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