R thread self-drilling anchor bar-Jiufu company

Product Description

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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 for complex geological conditions in different projects. The solution meets people&#;s requirements for security.

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.

The self-drilling anchor bolt system is composed of a hollow anchor bar, coupler, nut, drill bit, plate, and centralizer. It can combine drilling, grouting, and anchoring in one process. The self-drilling anchor bolt system is safe, efficient, and convenient. It is suitable for broken rock, loose soil, and geological conditions where is difficult to drill holes. It helps to ensure the anchoring effect in complex ground conditions and achieve the best construction result.

For more information, please visit R Thread Self Drilling Anchor Bars.

It is an advanced anchoring system that can directly realize drilling and grouting functions in loose soil layers and broken rock layers, consisting of a continuous full-threaded hollow bolt body, a sacrificial drill bit, a coupler, a flat or domed plate, a hex or domed nut, a centralizer, and other accessories. Self-drilling anchor systems can be used as micro piles and soil nails and are a fast and efficient solution for geotechnical anchoring.

Thread Processing Methods

The thread shape of the hollow bolt body is very similar to the thread of the steel rib. The thread pitch is large and the teeth are deep. The surface thread of the connection can not only bond with the cement, but also provide good adhesion and friction resistance, and can be extended at will.

The external thread of the hollow bolt body needs to be processed by a three-axis thread rolling machine. Because the raw material is a hollow steel pipe, the two-axis rolling machine is prone to the problems of oval, flattening, and even cracking of the hollow bolt body. Therefore, a three-axis thread rolling machine is used. The processing thread has good forming and high precision, which can meet the needs of drilling construction.

Thread Types

There are two kinds of threads on the surface of the hollow bolt body, one is the R-type thread that conforms to the ISO standard, and the other is the T-type thread that can provide greater support force. Generally, the adhesion friction force of the same type of T-thread is more than twice that of the R-type, and the T-thread anchor is more used in the application of micro piles.

Two methods are used to process the hollow bolt body, cold rolling, and temperature-controlled rolling. Cold-rolled threads are rolled to improve the grain structure of the steel and increase the yield strength. The temperature-controlled rolling can be changed according to the different needs of the application scenarios. The mechanical properties of the hollow bolt body and temperature-controlled rolling can more effectively ensure the metallographic structure and finer grains of the rod body. It is suitable for occasions with high elongation requirements and meets more customer needs.

Features and Advantages

1. Self-drilling anchor bolt system, which combines drilling, grouting, and anchoring together, is suitable for broken rock and conditions which are difficult to drill holes. Casing pipe is omitted in construction, which greatly improves construction efficiency.

2. Self-drilling anchor bolt system has a rich variety of drill bits, and the drill bit can be selected according to the properties of rock and soil, which can improve the drilling efficiency.

3. Self-drilling anchor bolt system can fill cracks, consolidate rock mass and soil layer through pressure grouting, and has good grouting spreading radius and reliable anchoring quality.

4. The hollow anchor bar can be cut arbitrarily and lengthened by the coupler. Therefore, the self-drilling anchor bolt is suitable for construction in a narrow space that large equipment cannot enter.

Categories

Tunneling in Rock, Underground Structures

Keywords

self drilling rock bolts, self drilling rock anchors

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