R thread self-drilling anchor system-R type

R thread self-drilling anchor system-R type

R-threaded self-drilling anchors are fully threaded, with specifications ranging from R25-R51. It consists of hollow anchor rods, nuts, anchor plates, couplers, drill bits and other components. Due to the functions and characteristics of its own system, it can ensure the anchoring effect under complex foundations during construction. It can be widely used in railways, subways, mines, tunnels and other projects to ensure the stability of the foundation and play a very importment role in safety protection. It Provides solutions for anchoring, micro-piling and in the complex foundation conditions.

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Product Description

With the rapid development of all fields of society, people have higher and higher requirements for safety, especially in fields such as subway and railway engineering, mines, tunnels, dams and slopes. Hebei Jiufu Industrial and Mining Accessories Co., Ltd. is a manufacturer specializing in supplying supporting materials for coal mining, construction projects, and large-scale concrete projects. The main functions of Jiufu hollow anchors are drilling, grouting and anchoring, leaving a reinforced grouting column and anchor head in each wellbore. We have R thread design and T thread design types to choose from. As an advanced system, R thread can realize drilling, grouting, and anchoring at the same time during construction, improving construction efficiency, reducing composite material costs, and is simple to install and operate at the construction site. R-threaded self-drilling anchors are good at working in complex ground conditions, such as weathered rocks, gravel layers and other broken geological conditions. This is what distinguishes them from other anchors, thus providing the best solution for complex geological conditions in different projects. The solution meets people’s requirements for security.

Anchor Hollow Bar Technical Data
SIZE	OD(MM)	ID(MM)	ULTIMATE LOAD(KN)	YIELD LOAD (KN)	WEIGHT(KG/M)	LENGTH(M)
R25N	25	12	200	150	2.3	1M-9M
R32L	32	22	260	200	2.8	1M-9M
R32N	32	21	280	230	2.85	1M-9M
R32N	32	18.5	280	230	3.4	1M-9M
R32S	32	17	360	280	3.45	1M-9M
R32SS	32	15	405	300	4.1	1M-9M
R38N	38	22	500	500	4.8	1M-9M
R38N	38	19	400	400	5.5	1M-9M
R51L	51	36	550	450	6.3	1M-9M
R51N	51	33	800	630	7.8	1M-9M

Composition

1. Hollow anchor：

The anchor itself is a full-length thread, which can be cut at will according to customer requirements and lengthened with a coupling. Continuous threads like waves can bond well with cement slurry to achieve better anchoring effect.

2. Anchor nut：

Nuts are connecting devices used with pallets.

3. Pallet (hot rolled steel plate)：

The function of the pallet is to exert anchoring force on the surrounding rock, transfer stress, increase end force, and enhance the anchoring effect. The pallet is installed at the end of the hollow anchor rod, between the nut and the rock formation. According to the shape, it can be divided into dome plate and flat plate.

4. Anchor Coupler：

It is a component used to connect two bolts to each other and can be heat treated according to customer requirements.

5. Drill bit：

A drill bit is a device that performs and withstands the drilling process. Choose from a variety of unique drill bit structures for different rock types.

The biggest difference between this drill bit and other anchor drill bits is that it is disposable. Once the drill bit is drilled with the hollow anchor system, it can never be pulled out again. This also saves the replacement process and simplifies the construction steps. Save a lot of time and cost.

6. Centralizer：

The main function of the centralizer is to maintain the correct position of the anchor bolts during installation. When the hollow anchor rotates at high speed in the hole, ensure the smooth operation of the anchor and keep the drill bit axis as close as possible to the center line of the drilling hole. Without a centralizer, the bolts may deviate from their original positions under harsh ground conditions, affecting the anchoring effect and structural stability.

Installation

The installation of traditional rock bolts can be a time-consuming and labor-intensive process. Predrilling holes requires additional equipment and requires multiple steps to secure the bolts in place. This can result in longer project times, especially for large-scale applications.

The installation of self-drilling anchors is more convenient, faster and faster, and has significant efficiency advantages. Pre-drilling is eliminated, saving time and reducing the complexity of the installation process. Self-drilling capability allows for faster, more streamlined installation.

1. Pre-construction preparation:

Check whether the functions of the drilling rig are normal, whether the drill bit and the hollow anchor bar are broken, and whether the hollow anchor bar is free from damage. After making sure there are no problems, rotate the hollow anchor bar to be used with the drill bit;

2. Drilling and grouting:

Connect the hollow anchor bar and grouting pipe to the drilling rig by rotating the grouting adapter and grouting during the drilling process, so that drilling and grouting are completed simultaneously;

3. Hollow anchor bar extension:

If the length of a single self-drilling anchor bar does not reach the design drilling depth, it can be connected with a coupler to meet the design requirements;

4. Installation of plate and nut:

After grouting is completed, install plate and nut in the exposed part of self-drilling hollow anchor bars against the construction surface in order to ensure the anchoring effect.

Advantages

1. Easily penetrates various rocks and can work under complex and broken foundation conditions.

2. It can be elongated by using couplers.

3. No need to pull it out.

4. The hollow rod can be used as a grouting channel.

5. Drilling, grouting and anchoring can be completed at the same time.

6. With optional epoxy coating to prevent corrosion and can be permanently applied.

7. There are two thread types to choose from (R type and T type)