The ZJS self-drilling hollow grouting anchor bolt adopts high-quality thick-walled seamless steel pipe material, a perfect and efficient surface thread forming process, and well-crafted accessories, truly realizing the integration of drilling, grouting, and anchoring functions of the self-drilling anchor bolt. The drill bit with strong penetrating power at the front of the anchor bolt can easily penetrate various rocks under the action of general rock drilling machinery. It has continuous international standard wave threads and can be used as a drill pipe with a drill bit to complete drilling and form anchor holes.
I. Structure of ZJS Self-Drilling Hollow Grouting Anchor Bolt
1. Nut: can concentrate and transmit the stress of dangerous rock to the base plate.
2. Arched base plate: can withstand greater stress from dangerous rock.
3. Grout stopper: maintains a certain pressure during grouting to fully fill the voids in dangerous rock.
4. Anchor bolt body: continuous international standard wave threads, convenient for installing drill bits, connecting sleeves, and tightening nuts; and can be cut and connected for extension at will.
5. Anchor bolt connecting sleeve: enables the anchor bolt to be extended while drilling to the designed depth.
6. Alloy drill bit: has extremely strong penetrating power, enabling the anchor bolt to pass through various rocks.
II. Scope of Application
The ZJS self-drilling hollow grouting anchor bolt produced by our company is widely used in advanced pipe roof support and slope support for highways, railways, tunnels, and underground caverns of water conservancy and hydropower projects. It is suitable for complex geological conditions such as weak and dangerous rock, fault fracture zones, and high ground stress with large deformation, especially in projects with severe hole collapse, construction of extra-long anchor bolts, and construction in narrow sections. It is one of the most economical and effective methods to improve the stability of rock and soil and solve stability problems in complex geotechnical engineering.
III. Features of ZJS Self-Drilling Hollow Grouting Anchor Bolt
1. There is a drill bit with extremely strong penetrating power at the front of the anchor bolt. Under the action of general rock drilling machinery, it can easily penetrate various rocks.
2. The drill pipe has continuous international standard wave threads and can be used with a drill bit to complete drilling.
3. The anchor bolt body of the drill pipe does not need to be pulled out; its hollow part can serve as a grouting channel for grouting from the inside out.
4. The high-efficiency grout stopper enables grouting to maintain strong pressure, fully fill voids, and fix broken rock mass. The high-strength base plate and nut can evenly transmit the stress of deep dangerous rock to the surrounding wall rock, achieving the purpose of mutual support between dangerous rock and anchor bolt.
5. The high-strength connecting sleeve processed by mechanical cutting technology gives the self-drilling anchor bolt the characteristic of being extended while drilling, making it suitable for smaller construction spaces and realizing the design purpose of reinforcing dangerous rock with extra-long anchor bolts.
6. Due to the three-in-one function of the anchor bolt, it can form anchor holes and ensure anchoring and grouting effects without special methods such as casing protection and pre-grouting during construction under various dangerous rock conditions.