Bonded steel reinforcement is to bond the steel plate t […]
Bonded steel reinforcement is to bond the steel plate to the surface of the concrete member with high-performance epoxy adhesive, so that the steel plate and the concrete form a unified whole, and the good tensile strength of the steel plate is used to enhance the bearing capacity and rigidity of the member. Bonded steel reinforcement is also a common reinforcement technology, which has been widely used due to its quick construction, durability, flexibility, and good economic value.
In the process of sticking steel, some anchor bolts need to be planted, and these anchor bolts play different roles in pressure-bonding steel and coating steel. Pressure injection glued steel, these anchor bolts only play the role of fixing the steel plate. When fixing the steel plate, pay attention to the anchor bolt not to be tightened too tightly. It is necessary to ensure a 2-3mm smooth gap between the steel plate and the strengthened member. Squeeze the glue. When the sticking steel is coated, the anchor bolt not only plays the role of temporary fixing, but also acts as a pressurizing function to ensure that the colloid is uniformly and effectively bonded to the strengthened member. The role of anchor bolts in the process of sticking steel is still very large, so there are strict requirements in the selection and arrangement.
First, the anchor bolt should be a chemical anchor bolt, and no expansion bolts should be used. Because the expansion bolt is unstable, if the adhesive is not fully solidified, the failure of the expansion bolt will result in an empty drum near the anchor.
Then the anchor bolt should not be required to be larger than M10. Many people think that the larger the diameter of the anchor, the greater the anchoring effect. In fact, this sentence itself is not wrong, but when sticking steel, the main role of the anchor bolt is temporary fixation and temporary pressure, so there is no need for much anchoring force. If the anchor bolt is too large, it will need to A large bolt hole is opened on the steel plate and the reinforced member. If the hole is too large on the steel plate, the force cross-sectional area of the steel plate is reduced, and the force of the steel plate is weakened. If the opening of the reinforcing member is too large, the original member is damaged.
The spacing of the anchor bolts should not be too small. The margins and spacing of the anchor bolts are not less than 60mm and 250mm respectively. When the anchor bolt is pressurized, the spacing should not be greater than 500mm, so it is reasonable to control the anchor bolt distance between 250mm-500mm when the steel is strengthened. It is important to emphasize that under no circumstances should the anchor be involved in the force of the glue layer.