Description
Technical Parameters
Segment Tunnel Straight Bolt
Segment Tunnel Straight Bolts are designed specifically for connecting straight segments within a tunnel. These bolts are essential in maintaining the stability and structural integrity of the entire tunnel. Their design is tailored to meet the connection requirements of straight segments, offering dependable support to the tunnel structure.
Segment Tunnel Straight Bolt Specification
| Dimension | Arc Length mm | Tensile Strength | Surface Treatment |
|---|---|---|---|
| M25～M48 | 480～880 | 4.6,4.8,5.6,5.8,8.8 | Dacromet, Hot dip Galvanized |
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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