Opening Strengthened

In the news, it is common to see some reports that when installing air conditioning or other equipment in a house, construction workers often make holes in the beams, leading to great panic among homeowners. So how should we handle this situation?

The main basis for determining how much safety hazard a hole poses to a beam is the degree of damage to the main reinforcement and stirrups inside the beam.

1) If during the opening process, the main reinforcement is not broken, but only individual hoops are broken, and the opening is small, then reinforcement treatment may not be carried out. In fact, not requiring reinforcement treatment does not have any impact on the structure, but the holes are relatively small and have a relatively small impact on the structure. Considering that the structure will have a certain Factor of safety in the design, it can not be strengthened.

2) Break part of the main reinforcement

If the opening breaks some of the main reinforcement and has a certain impact on the safety performance of the beam, it is considered to use the reinforcement method of pasting carbon fiber sheet or pasting steel plate for reinforcement. The specific reinforcement plan needs to be calculated by contacting a professional design unit.

Attention, it is necessary to take this situation seriously as soon as possible, and reinforce it as early as possible to avoid regret in case of accidents.

3) Break all steel bars

Breaking all the main reinforcement when opening the hole is equivalent to degrading into a plain concrete beam, greatly reducing the bending bearing capacity, which is quite dangerous. Due to the fact that pasting steel plates or carbon fiber sheet is not suitable for strengthening components with a reinforcement ratio of less than 0.2% on one side of plain concrete or longitudinal load-bearing steel bars, reinforcement can be achieved by planting steel bars and increasing the cross-section. The specific reinforcement amount also needs to be calculated by a professional design unit.

This case belongs to the second scenario, where only a portion of the main reinforcement is interrupted. The reinforcement process of pasting carbon fiber sheet and steel plate is used to strengthen the beam to improve its bearing capacity and stability.