Mining roof bolts

Mining roof bolts are critical components to reinforce and stabilize the roofs of underground mine tunnels. Their primary purpose is to prevent the roof's collapse, ensuring the miners' safety and the mining operation's integrity.

Mining roof bolts sometimes are made of 19 wire strands. The 19-wire strand we produced could be Warrington type. This is a multi-wire contact structure prestressed steel strand, characterized by 19 steel wires that make up the steel strand,

One central steel wire, six equal diameter inner steel wires, six equal diameter outer thick steel wires, and six equal diameter outer fine steel wires

The volume fraction of sorbite of 82B raw wire rod is more than 85%, and the non-metallic inclusion grade is less than 2.0. There are no high magnification microstructure defects such as reticular structure and martensite.

The manufacturing standard could be China's national standard GB/T5224 and Japan's Industry Standard JIS G3536.

Inquire Now

ADVANTAGES

-Mining Roof Bolts Advantages

1. Steel Strand not only achieve high tensile strength but also have better plasticity and toughness

2. Tensile Force is more than 900 KN

3. The performance of multi wire large-diameter high-strength low relaxation 28.6mm prestressed steel strands has exceeded the index requirements of similar international product standards.

Mining Roof Bolts

Types of 19 Wires Strand Mining Roof Bolts

Mechanical Anchors:

Expansion Shell Bolts: These bolts have an expansion shell that grips the rock when the bolt is tightened.

Tension Rebar Bolts: These use tension to anchor the bolt in the rock.

Resin-Grouted Bolts:

Resin Anchored Bolts: A two-part resin is used to secure the bolt in place. When the bolt is inserted, the resin hardens, creating a strong bond.

Cable Bolts: These are longer and more flexible, consisting of steel cables anchored with resin.

Friction Bolts:

Split Set Bolts: These bolts rely on friction between the bolt and the rock to provide support.

Swellex Bolts:

Hydraulically Expanded Bolts: These are expanded using high-pressure water, which creates a tight fit against the rock.

USE

Mining roof bolts are indispensable in modern underground mining operations, providing essential support to mine roofs and enhancing the safety and efficiency of mining activities. Their selection and proper installation are crucial to their effectiveness, making them a fundamental aspect of mine design and safety management.

● Underground roadway roof support.

● Some super important projects have a high requirement for safety.

Installation Process of Mining Roof Bolts

1. Drilling:

● A hole is drilled into the mine roof using a specialized drilling machine.

2. Inserting the Bolt:

● The chosen type of roof bolt is inserted into the hole. For resin-grouted bolts, a resin cartridge is inserted first, followed by the bolt.

3. Anchoring:

● Depending on the bolt type, it may be mechanically anchored, resin-grouted, or expanded to secure it in place.

4. Tensioning:

● Some bolts require tensioning to ensure they are tightly secured. This can be done manually or using hydraulic equipment.

You can choose us as a Mining Roof Bolts Supplier. To meet your specific needs. And offer a range of solutions to suit various mining applications.

SPECIFICATIONS

Structure	Standard	Nominal diameter	Tolerance on Diameter	Nominal Area of Section	Weight of strand	Tensile Strength, Rm	Minimum Breaking load,Fm	0,2% proof force , Fp0.2	Elongation Lo=500mm, Agt	Curvative of strand	Lay Length	The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than
		(mm)	(mm)	(mm2)	(kg/1000m)	(N/mm2)	KN	KN	(%)	mm	mm
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1720	915	805	3.5	25	(12-18)d	2.5
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1770	942	829	3.5	25	(12-18)d	2.5
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1860	990	854	3.5	25	(12-18)d	2.5