Segment Tunnel Straight Bolt

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Segment Tunnel Straight Bolt

Segment Tunnel Straight Bolts are crucial fasteners used in the assembly and stabilization of tunnel segments, especially in large-scale tunneling projects such as subway systems, railway tunnels, and road tunnels. These bolts are used to connect the straight edges of precast concrete segments, ensuring a secure and aligned structure as the tunnel is built. GNEE Rail specializes in the production of high-quality Segment Tunnel Straight Bolts for use in large-scale tunneling projects. The company ensures that each bolt is manufactured to meet stringent industry standards for strength, durability, and performance. GNEE Rail offers a range of sizes and customization options to suit the specific needs of different tunnel projects, ensuring secure and reliable assembly of tunnel segments.

Segment Tunnel Straight Bolt Specification

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
			3.6	4.6	4.8	5.6	5.8	6.8	d≤163)	d＞163)	9.8	10.9	12.9
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
Vickers hardness HV F≥98N	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
Brinell hardness HB F=30 D2	max		2096)					238	304	318	342	361	414
Rockwell hardness HR	min	HRB	52	67	71	79	82	89	/	/	/	/	/
	min	HRC	/	/	/	/	/	/	22	23	28	32	39
	max	HRB	95.06)					99.5	/	/	/	/	/
	max	HRC	/						32	34	37	39	44
Surface hardness HV 0.3 max			/					7)
Yield point N/mm2	Nominal		180	240	320	300	400	480	/	/	/	/	/
Yield point N/mm2	min		190	240	340	300	420	180	/	/	/	/	/
Specified non-proportional elongation stress N/mm2	Nominal		/					/	640	640	720	900	1080
Specified non-proportional elongation stress N/mm2	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
Guaranteed stress N/mm2			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

Segment Tunnel Straight Bolt

Segment Tunnel Straight Bolt Specification

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