The function of concrete under the long-term natural environment and use environment must be gradually weakened. Therefore, the reinforcement of concrete will become an important task. Here we come together to understand some of the knowledge of concrete reinforcement.
Concrete reinforcement method
First, the indirect reinforcement of the ordinary way
1, pre-stressed reinforcement method. The method can reduce the stress level of the reinforced member, not only makes the reinforcement effect better, but also can greatly improve the overall bearing capacity of the structure, but after the reinforcement has a certain impact on the appearance of the original structure; suitable for large span or heavy structure Reinforcement and reinforcement of concrete members under high stress and high strain conditions, but in the absence of protection, can not be used in environments with temperatures above 600 °C, nor should it be used in structures with large compression creep of concrete.
2, growth support reinforcement method. The method is simple and reliable, but it is easy to invade the original appearance and use of the building, and may reduce the use of space; applicable to the reinforcement of concrete structures allowed by detailed conditions.
Second, the general method of direct reinforcement
1ã€Increase cross-section reinforcement method This method has simple construction process and strong adaptability, and there are mature design and construction lessons; concrete reinforcement for beams, slabs, columns, walls and normal structures; however, wet work lessons for on-site construction The long time has certain influence on the production and career, and the reinforcement of the building's clearance will surely decrease.
2. Replacement concrete reinforcement method The strength of this method is similar to that of the enlarged section method, and it does not affect the clearance of the building after reinforcement. However, there is also the problem of long wet construction time; it is suitable for the low strength of the concrete in the compression area or The major drawbacks are the reinforcement of concrete load-bearing members such as beams and columns.
Problems to be noticed in the construction of concrete reinforcement
(1) In repairing construction, it is mainly to strengthen the control of the combined quality of old and new commodity concrete to ensure the overall force of the old and new commodity concrete, and the degree of both ends of the new part should be considered in the same fashion. Before the construction, we need to cut and clean the parts that need to increase the cross section. We must form a pit or a trench, remove all loose surfaces and floating soil, and clean the overlapping contact surfaces with a wire brush. Before the construction of commodity concrete, it shall be rinsed with clean water, and the surface of the original component shall be kept moist, but no water shall accumulate to avoid the occurrence of interlayer between the old and new commodity concrete. Before pouring commercial concrete, the surface of the original commercial concrete should be treated with an interface agent such as cement mortar to reinforce the combination of old and new commodity concrete.
(2) When the strength of the newly added commercial concrete does not reach the required strength of the design, it is forbidden to increase the external additional load. When the strength of the horizontal member such as the structural beam does not meet the requirements, the unloading support and the formwork support must not be removed.
(3) When beams or columns are reinforced with three-side or four-side outsourcing methods, the edges and corners of beams and columns shall be knocked out, and scum and dust shall be removed.
(4) The new part of the reinforced steel application of short steel bar and the original component of the main ribs welded firmly, the welding site must be strictly in accordance with norms, procedures require inspection and acceptance to ensure construction quality. If you do not weld, you can add new stirrups.
Replacement concrete reinforcement method What needs attention?
1. When concrete parts reinforced by displacement concrete reinforcement method are reinforced, the strength grade of the original component concrete in the non-replacement part shall not be lower than the strength grade specified in the construction of the concrete structure according to the site detection structure.
2. When the interface treatment of the replacement part of the concrete test member and the construction quality meet the requirements of the specification, the joint surface can be calculated according to the overall force.
3. When replacing the concrete reinforcement method to reinforce the beam members, the original members shall be effectively supported. When the method is used to reinforce columns, walls and other components, the original structure and components shall be checked, observed and controlled during the entire construction process. The concrete at the displacement interface shall not be subject to tensile stress. If there are difficulties in control, it shall be taken. Support top and other measures for unloading.
4. The displacement concrete reinforcement method is applicable to the partial reinforcement of low concrete strength or serious defects in the compression zone of the load-bearing structure.
Summary: The above is the content of the concrete reinforcement methods and precautions that Xiaobian introduced for everyone. I hope that we can effectively help everyone. For more information, please pay attention to this site.
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