Hollow self-feeding bolt is mainly used in excavation and support construction of fault fracture zone. It replaces ordinary mortar bolt under complex geological conditions, overcomes the difficult problems such as hole collapse, unable to insert rod and insufficient grouting, plays the role of bolt support, improves the bearing capacity of surrounding rock and ensures the overall stability of surrounding rock, and has good application value.
The Hollow Self-Feeding Anchor Bolt is a mechanical component used for tightening and anchoring in concrete structures, rock or other materials. This type of bolt can be self-feeding through its unique design, which means that it can automatically adjust to the actual conditions of the anchoring medium during the anchoring process, thus providing a stronger and more stable anchoring effect. Below is a basic overview of some of the hollow self-feeding anchor bolts:
Key features
Self-feeding: the bolt automatically adjusts its length when torque is applied to ensure anchoring effectiveness.
High strength: usually made of high strength materials to withstand high preload and working loads.
High anchorage force: Hollow design helps to create good anchorage in the anchoring medium.
Easy to install: Designed to simplify the installation process and improve construction efficiency.
Corrosion resistance: Surface treatment enhances its corrosion resistance and extends its service life.
Areas of Application
Concrete Structure Reinforcement: Used for reinforcing concrete structures such as buildings, bridges and tunnels.
Rock anchoring: anchoring in rock projects such as mines and slopes.
Mechanical fixing: used for fixing machines and equipment or other heavy machinery.
Temporary support: used as temporary support structure in building construction.
Manufacturing process
Material Selection: Usually choose high strength steel or alloy material.
Cold or hot forging: the basic shape of the bolt is formed through the forging process.
Hollow processing: through drilling or other ways to make hollow structure.
Thread processing: Processing threads on one end of the bolt for use with nuts.
Surface treatment: zinc plating, painting or other anti-corrosion treatment.
Working Principle
The working principle of a hollow, self-feeding anchor bolt usually involves the following steps:
Drilling: Drill holes in the anchoring medium matching the diameter of the bolt.
Inserting the bolt: The bolt is inserted into the hole and good contact with the hole wall is ensured.
Applying torque: By applying torque with a wrench or other tool, the bolt will deform elastically in the hollow part.
Automatic feed: As the torque increases, the elastic deformation of the bolt causes it to anchor further in the hole until the desired anchoring force is reached.
Precautions
Preload: Ensure that the correct preload is applied during installation to avoid loosening or breaking of the bolt.
Checking the medium: Check the integrity of the anchoring medium before installation to avoid anchoring in defective areas.
Periodic Inspection: Periodically check the tightness of the bolts and maintain or replace them if necessary.
Hollow self-feeding anchor bolts are widely used in many fields due to their efficient, stable and reliable anchoring performance. Correct selection and use of such bolts can effectively improve the safety and stability of the structure.