Twisted Anchor Rod
Product Advantage:
1. Twist anchor is a kind of anchor used for underground support in coal mine, full-length iso-strength, the length can be intercepted at will, good anchorage.
2. Large pre-tensioning force:Reasonable structure, large pre-tensioning force, can automatically adjust the direction of force, enhance the binding force on the surrounding rock, simple operation, low price.
3. Has good anti-skid: because the front section of the twist type structure makes it has good anti-skid, and has the advantages of easy installation, long service life, high reliability, it is widely used in mining, industry, bridges and other projects.
Product description
Twist anchor is the basic component of tunnel support in contemporary underground mining, he will be the tunnel of the surrounding rock bound together, so that the surrounding rock itself to support itself, the anchor is not only used in mines, but also used in engineering technology, on the slope, tunnel, dam, etc. for active reinforcement.
Twist anchor is divided into two kinds, one is the threaded steel twist anchor, that is, in the head of the anchor screwed part of the twist, than ordinary twist anchor preload, the other is the use of a variety of specifications made of round steel, in the head of the round steel to do a section of the twist.
Product Parameter
Product Name | Standard（mm） | Yield Strength(MPa) | Tensile Strength(MPa) | Extensibility(%) | Yield load(KN) | Tensile Load(KN) |
Twisted Anchor Rod | M16 | 235 | 360 | 15-20 | 40 | 55 |
M18 | 235 | 360 | 15-20 | 50 | 75 | |
Twisted Anchor Rod | M20 | 235 | 360 | 15-20 | 60 | 95 |
Working Principle and Installation
1. Working Principle.
Twist type resin anchor metal rod body consists of different strength material rod body and its accessories together with matching resin anchoring agent. According to the design of anchoring length, the rod body will be inserted into the hole where the anchoring agent is put, after stirring, the anchoring agent will produce chemical reaction, and within a certain period of time, the rod body will be bonded with the coal and rock as one body and fixed in the rock wall, and the threaded end of the threaded end will be added with the protection net and the bearing tray, and then tightened with the nut to achieve the role of the support, which will form the high-strength pre-stressing support that can control the roof stabilization, adapt to the movement of the peripheral rock, reduce or even eliminate the off-layer, and solve the problem of roof collapse. It can effectively reduce or even eliminate the separation of layers and solve the problem of roof collapse. It consists of a variety of support forms and structures to form a prestressed support system, which realizes the mechanical installation and greatly improves the safety and reliability of the support.
2. Installation and use
The use of installation in strict accordance with the technical specifications for the construction of coal mine prestressing anchorage, the implementation of MT/T879-2000 standard anchoring agent must be consistent with the People's Republic of China coal industry standards MT146.1-2011 standards, the tray must use GB700-2006 carbon structural steel materials.
a. The metal rod body of resin anchor with required specification is transported and placed at the roof plate in the coal mine.
b. At the center point of the resin anchor to be installed at the roof plate, use the wind drill to drill a certain specification depth of the anchor hole, the diameter of the hole is the anchor head of the anchor + (4-6) mm, and the depth is the total length of the anchor - (10-20) mm.
c. One end of the anchor shear head will be loaded with resin medicine roll, using 1.2kw coal electric drill as power, with a connecting device (special casing) and the anchor threaded connection, while rotating and stirring to advance the bottom of the hole. Stirring time for super fast resin volume 8-15s, other resin volume 20-35s. stirring stops, should wait for gelation, before loosening the electric drill and connecting device anchor body according to the geological conditions of the layout, threaded end will be installed tray, plastic washers, hexagonal nuts with a force wrench to tighten.
Storage and transportation
Resin anchor metal rod body is stored in a dry place, the anchoring section shall not be stained with oil, the threaded section should take measures to protect against rust. Every 5 rods as a group, bundled firmly, hanging a certificate of conformity. During transportation, the rods should be prevented from collision and nut falling off, and the rods should not be damaged or bent. Protective measures should be strengthened during transportation and stacked neatly.
Product characteristics
1. Fast growth of strength, high strength, installed not only in time to withstand the load, and anchoring force.
2. Easy to install and operate, low labor intensity of workers, high support efficiency.
3. Tons of coal support cost is low.
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