JIN JU FENG

16 Years Manufacturing Experience

“Self drilling bars” is a kind of hollow bolt

“Self drilling bars” is a kind of hollow bolt, which is mostly used for relatively stable and complete rock formations. Anchoring agents such as resin, engineering glue, and quick-setting cement are injected from the center of the bolt, which is better than ordinary bolts. Due to the emergence of self-propelled hollow grouting bolts, hollow grouting bolts can also be used in strata under loose geotechnical conditions.
“Self drilling bars” is a kind of hollow bolt, which is mostly used for relatively stable and complete rock formations. Anchoring agents such as resin, engineering glue, and quick-setting cement are injected from the center of the bolt, which is better than ordinary bolts. Due to the emergence of self-propelled hollow grouting bolts, hollow grouting bolts can also be used in strata under loose geotechnical conditions.
Product introduction
The bolt body of the hollow bolt adopts a hollow design, and the hole in the rod body is used as the drilling high-pressure air-water channel and grouting channel. Compared with the solid rod body, the hollow rod body design can obtain better rigidity and shear strength. The standard large-pitch thread structure on the outer surface of the bolt is convenient for cutting and connecting the bolt. Compared with the smooth rod body, the bonding area between the bolt body and the grouting material is increased, thereby improving the anchoring force.

Features
1. It is easy to install and ensure that the prestressing can be applied in time.
2. Active tension, the prestress can reach 50KN, and can achieve appropriate super tension.
3. Using conventional tools, the tensioning operation can be achieved by a single person.
4. High-pressure grouting can be achieved through the hollow rod body to improve the surrounding rock.
5. Full control from production to installation to ensure quality.
structure
It is composed of steel expanding shell anchor head, hollow grouting bolt body, grouting stopper, backing plate and nut

Quality Control and Inspection
1. The allowable deviation of bolt installation shall meet the following requirements
1) The diameter of the bolt hole should meet the design requirements.
2) The depth of the bolt hole should be greater than 250px of the length of the bolt.
3) The allowable deviation of the bolt hole distance is ±375px.
4) The insertion length of the anchor rod shall not be less than 95% of the design length.
2. The direction of the bolt hole should meet the design requirements
The anchor plate should be closely attached to the base surface, and the anchor should be straight, without damage, and without cracks, oil stains, granular or flake corrosion on the surface.
3. Quality control
Pre-job training is required.
Let the operator understand and pay attention to the application procedures and standards.
Before starting work, a thorough disclosure must be made.
The anchor bolt arrangement must be drawn, and its position should be strictly controlled.
Control the water-cement ratio of the mortar.
Control the grouting pressure and the amount of grouting.


Post time: Apr-11-2022