Customer question: Open a hole in the floor (located close to the beam), a 600×600 hole, two holes, and the distance between the two holes is 600. Can carbon fiber reinforcement be used?

Horse Construction is a manufacturer of structural reinforcement materials, so I asked a lot of customers who do design and construction. Some customers have the following answers, you can refer to it.

• Yes, generally, the openings within one meter can be reinforced with carbon fiber, and the effective cross-sectional area of the fiber cloth is larger than 1.2 times the cross-sectional area of the broken steel bar.

  
  

• Under normal circumstances, it is possible, but the distance between the two openings and the damage of the opening to the floor reinforcement should be considered. If the openings are too concentrated, it is recommended to add beams at the bottom of the slab.

  
  

• It turns out that the steel bars of the slab still need to be anchored around the hole, so it is recommended that the landlord set up a small beam of 100x200, with two reinforcing steel bars on the top and bottom.

  
  

• It can also be reinforced with steel plate or carbon fiber.

  
  

• According to the size of the hole, less than 1 meter, you can use carbon fiber reinforcement, but the distance between your two holes is too small, so it is recommended to use the method of adding beams to strengthen the comprehensive consideration.

  
  

• The concrete reinforcement method should be adopted according to the actual force of the slab span and the slab.

  
  

• It is not clear whether it is a two-way slab or a one-way slab, whether it is close to the main beam or the secondary beam, and the opening of less than 1 square meter is not a big problem.