In the building structure, the floor plays a vertical load of the upper part, and at the same time provides horizontal stiffness for the structure, coordinates the sideways of the structure, and maintains the overall common work.

After the existing floor is opened, the original transmission path and reinforcement are cut off. It will inevitably lead to the increase in the internal force of the board around the entrance, which will cause stress concentration. At the same time, the steel bars are cut off, resulting in a reduction in the load capacity. Therefore, reinforcement measures must be taken after opening the floor.

After opening the cave, the reinforcement treatment of the floor requires comprehensive consideration of factors such as the form of the floor, the size of the hole, and the location of the hole. According to the current national specifications, the main reinforcement methods include sticking steel reinforcement, increasing the section of the plate surface, the sticker fiber cloth reinforcement, and the newly added beam reinforcement of the hole.

1

In routine, if the width of the hole is not greater than 300mm and cutting off the steel bars is not more than 5%, it is generally not reinforced (it is best to commission professionals to model

2

If the width of the hole is not greater than 1000mm and the steel bars are cut off at no more than 20%, it can generally be reinforced with sticky steel or paste the fiber cloth

3

If the width of the hole is greater than 1000mm or the cutting steel bar is greater than 20%, the new border beam is used to reinforce it with a new border beam, and the border beam is added to reinforcement (and consider whether the original main beam needs to be reinforced)

The stability of the architectural structure itself has a certain stability. Once it is changed or destroyed, the component may be imbalanced in the original structure. Therefore, the structure transformation must be cautious, especially the long -term buildings.