In the project, after opening holes in our floor, we need different reinforcement methods, such as sticking carbon cloth, sticking steel and other reinforcement methods. When faced with these reinforcements, what should we pay attention to? Next, I will share with you these two different reinforcement methods and their commonalities.

Bonded carbon cloth reinforcement

The carbon cloth is thin, high in strength, basically does not increase the cross-sectional area, invisible in appearance, and soft, and can be turned and easily operated with the components, but it requires qualified materials and standard process construction to achieve the purpose of reinforcement! Operation method: The cast-in-situ continuous slab is opened. When the opening position is in the negative bending moment area of the slab, when the bonding carbon cloth is used for reinforcement, double-sided reinforcement should also be carried out. The order of the vertical and horizontal fiber cloth is not restricted.

Claim

1. The specification of carbon cloth is 200mm～300mm wide and 200g～300g quality.

2. This reinforcement method can only be used for structural reinforcement if the opening is small.

3. The maximum tensile value of the compensation carbon cloth shall not be less than 1.2 times the equivalent tensile value of the truncated steel bars.

4. When the carbon cloth is in contact with the steel plate, a layer of adhesive should be applied instead of direct contact.

Bonded steel plate reinforcement

The principle of this kind of reinforcement technology is to paste a layer of steel plate outside the building components that need to be reinforced. In this way, it can play a role in strengthening the housing construction project and improving its bearing capacity. The biggest advantage of this method is that there is no need to change the structure of the original building, it will not cause pollution and damage to the surrounding environment, and it will not have a greater impact on people's normal life. The reinforcement construction materials used are also relatively simple and easy to obtain. Not only that, this kind of reinforcement technology also has lower construction technical requirements, and can be put into use immediately after a short period of construction. And because the steel plate used in the reinforcement and transformation has good durability, it can play a good role in reinforcement even after a long period of time.

Claim

1. The steel plate selection specification should be 100mm～200mm wide and 3mm～5mm thick.

2. This reinforcement method can only be used for structural reinforcement if the opening is small.

3. The area of the compensation steel plate shall not be less than 1.2 times the equivalent cross-sectional area of the truncated steel bar.

Its commonality

Whether it is plate steel or carbon cloth that bears the negative bending moment, it will be blocked by the wall and cannot be penetrated. At this time, the screw and short angle steel can be used to pass through the wall to tie the anchor to transfer the tensile force. For the frame structure cast-in-situ floor slab with holes in the corner area, the plate steel or carbon cloth that bears the negative bending moment should be bent and anchored to the outside of the side beam, and meet the anchoring length requirements.

When opening holes for cast-in-place floor slabs, the stiffness and strength of the opening floor slabs will be weakened to varying degrees when not opening holes. Generally speaking, the weakening of rigidity is more obvious, and there will be greater stress concentration at the short sides or corners of the hole, and the reduction of the gluten of the board will result in the reduction of the bearing capacity. Therefore, after the internal force analysis and bearing capacity calculation of the floor slab after the opening, appropriate reinforcement treatment methods should be adopted in combination with the properties of the floor, the opening position (edge, middle), the size and shape of the opening, and so on.