Rock bolts application and types you should know

Rock bolts are crucial elements in stabilizing rock formations in various industries, from mining to civil engineering.
They are used to reinforce and support rock structures to prevent them from collapsing or shifting, which can pose a serious threat to workers and structures.
There are several types of rock bolts, each designed for specific applications. Here are some common rock bolt applications and types you should know.

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Rock Bolts Application and Types

1.Self-drilling Anchor System

Self-drilling anchor system consists of anchor bar, anchor coupling, anchor nut, drill bit, anchor plate, etc&#; In collapse stratum, loose soil, foundation etc. could be anchored effectively by using this system, which could be drilled and grouted simultaneously, thereby saving of installation time and construction cost. This anchoring system guarantees the safety.

2. Expansion Shell Rock Bolts

These rock bolts consist of a steel tube and an expansion shell that is inserted into a drilled hole in the rock. A cone-shaped wedging expansion shell is connected to the tube and expanded by using a mechanical tool or hydraulic pressure.
This creates a compressive force that anchors the bolt into the rock, providing additional support and stability.

3. Resin Grouted Rock Anchor Bolts

Grouted Rock anchors are bolts that are designed for use in conditions where the rock is fractured or weak. Grouted rock anchors consist of a steel anchor bar and resin which is inserted into a drilled hole in the rock, and then resin is injected around the bolt, filling the cracks or voids in the rock.
This creates a bond between the grouted anchorage surface and the bolt which creates extra support and stability to the rock structure.
The grouted rock anchor also provides resistance to any potential pull-out or lateral movement, making it a reliable choice for applications such as tunneling, mining and slope stabilization.
For example, if there is a slope that is prone to landslides, grouted rock anchor bolts can be used to secure the unstable rock and prevent any further movement.

4. Swellex Rock Bolts

Swellex rock bolts are a type of flexible rock bolts that are used in applications where ground conditions are unstable.
Instead of being fixed in place, Swellex rock bolts expand and contract with the surrounding rock, creating a secure hold even in areas prone to shifting or movement.
These bolts are installed using a specialized tool that hydraulically expands the bolt after it is inserted into the drilled hole. The bolt then conforms to any irregularities in the rock, providing additional support and stability.
Swellex rock bolts are commonly used in underground mining, tunneling and slope stabilization projects where the rock is weak or prone to movement.

5. Threaded Rebar Rock Bolts

Threaded rebar rock bolts consist of a steel bar that is threaded on both ends. The bolt is inserted into a drilled hole in the rock and secured in place with an anchor plate and nut.
This type of rock bolt is commonly used in mining and civil engineering projects where there is a need for extra support and reinforcement of the rock structure. Threaded rebar rock bolts are ideal for use in hard rock conditions where other types of rock bolts may not be effective.

Why Should You Choose ONTON For Your Rock Bolts

At ONTON, we understand that the success of any tunneling, mining or civil engineering project depends on the reliability and durability of the equipment used.
That&#;s why we offer top-quality rock bolts like the grouted rock anchors that are designed to withstand even the toughest rock conditions.
Our rock bolts are made from high-strength and corrosion-resistant steel, ensuring that they will maintain their integrity even in harsh environments.
Contact us today for the rock bolts that&#;ll take your buildings to the next level!

How do You Know about Self-drilling Anchor Bars

Thread

The self-drilling anchor bar's thread is designed as a through-body continuous thread, and this design is instrumental in realizing arbitrary cutting connections. This means that these threads run continuously along the entire length of the anchor bar, allowing for flexible and custom connections. The continuous thread design makes it easy for construction professionals to cut the anchor bar to the desired length while maintaining the integrity of the threaded connection. This convenience is a significant advantage in various construction scenarios, where adaptability is key.

One of the key aspects of the thread design is the ability to meet the diverse demands of customers.

R-type threads are designed with reference to the ISO standard. They are primarily suitable for small-diameter self-drilling anchor systems. The reference to this standard ensures that R-type threads adhere to recognized industry norms, providing consistency and reliability for smaller diameter anchor bolts.

T-type threads, on the other hand, are enterprise-standard threads designed with reference to the threads of fine-rolled threaded steel bars. These threads are full of teeth, ensuring a strong adhesion to the slurry. The robust connection formed by T-type threads enhances the overall strength of the anchoring system, making them ideal for more substantial construction applications.

 

Structure

At the core of anchor bar structure is the specially designed chamfer at the bar's end. This chamfer takes the form of a right angle combined with a beveled angle. This design serves multiple essential purposes in the construction process.

First and foremost, the right angle and beveled angle chamfer make the installation of the anchor bar remarkably convenient, especially when used with couplers. This streamlined installation process reduces the time and effort required for construction, contributing to overall project efficiency.

Another crucial advantage of this chamfer design is its positive impact on sealing effectiveness. By incorporating a sealing ring that fits snugly into the beveled angle, the risk of damage to the sealing ring during installation is minimized. This not only improves the sealing effect during construction but also enhances the long-term durability and reliability of the anchor system.

 

Specification

Our independent research and development has a large diameter anchor rolling machine, that can process anchor bar diameter up to 200mm, and anchor bar tensile force from 200kN to kN ranging from the customer construction of specifications and performance needs.
 

Type

In order to meet the customer's demand for products in different scenarios and with different service life, we have different series of self-drilling anchor system products to choose from, both stainless steel products suitable for corrosion-resistant geology and low carbon products with high impact requirements, both conventional products suitable for the mass market and more cost-effective economic products, so that the customers can choose according to their own needs.

Self-drilling anchor can be installed for pre-support, acting as steel structure for load-bearing, or thought it grouting to achieve better geological condition.

Features

Stable quality;

Thread is compatible with ISO and other international standards;

Precision-manufactured anchors with &#; 0.20 mm tolerance;

Good toughness, Agt &#; 10%;

Premium material and special thread rolling process granting good mechanical performance.

Applications

Pre-supporting, micropiling for foundation underpinning, slope anchorage, etc.

Characteristics

No casings required, because anchor bars can be drilled into loose soils without needing casings to support the boreholes.

Both rope threads and trapezoid threads are robust and ideal for rotary-percussive drilling and ensuring a high level of bond with the borehole gout.

Fast drilling and installation, drilling, installation and grouting processes are in a single operation.

The hollow core not only serves for flushing during drilling, but also for grouting after drilling.

For more R Thread Self Drilling Anchor Barsinformation, please contact us. We will provide professional answers.

Continuous threads ensure that the bars can be cut and coupled or extended at any point.

Self-drilling anchor systems for tunnel stabilization

Self-Drilling Anchor systems are used when the bond behavior is critical for the level of safety required on tunneling contraction. Self-drilling Anchors are successfully used for reinforcement ahead of the tunnel face in terms of spiles or spile umbrella support, additional reinforcement, and supplementary anchor works.

The advantages of the Self-drilling system are:

       &#; Variable applications.

       &#; Especially advantageous in rock/soils with low cohesion.

       &#; Simple to install in unstable boreholes.

       &#; No stalling when drilling across clefts.

       &#; Drilling and installation in one cooperation.

       &#; Grouting assured over full depth of the borehole.

       &#; No need to extract drill strings.

The main applications of Self Drilling Anchor Systems in Tunnel Construction

Self-drilling spiles

&#; For stabilization ahead of working face

&#; For safeguarding operations at the working face

Rock bolts

&#; Anchoring system can accommodate rock pressure

&#; Local stabilization of blocks and fault zones

&#; Follow-up rock stabilization

Tunnel face anchors

&#; Stabilization of working face in squeezing rock masses.

&#; Stabilization of working face when using pipe umbrellas

Tunnel floor reinforcement

&#; For strengthening the base of the tunnel arch

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