01/14/2020

Reinforcement of concrete structures

Reinforcement is one of the principles that has always been considered in the performance of concrete structures and has a great influence on their strength. Reinforcement enhances the tensile strength of the structure and strengthens it against environmental stresses. This method is one of the most basic methods in the creation of modern buildings and makes the structure acceptable in terms of engineering principles. Reinforcement should be fitted with a suitable size rebar to ensure the strength of the structure. In the fitting of the armature, the rods are arranged together in a special order and are connected by metal fastening or cold welding. Reinforcement is performed in the form of curved and locked rods for the construction of columns and foundations of the building and in the form of a few simple rods joined together for roofing. Bending of bars for reinforcement is done by different methods, each of which is suitable for different structures. In general, reinforcement is performed in three regular, nodal and Croatian methods. Cold welding is used in all three methods to hold the bars together because conventional welding reduces the tensile strength of the reinforcement due to the lack of flexibility. Reinforcement has the following advantages:

The strength of concrete structure is increased by reinforcement against factors such as fire and moisture.
Reinforced concrete does not require maintenance costs.
Construction of concrete structures requires less skill than steel structures.
Reinforcement is one of the most important factors preventing the building from deviating from its primitive state.
Concrete reinforcement can be shaped into different shapes.
Reinforced concrete has a high compressive strength compared to other building materials.
Reinforcement plays an important role in increasing the tensile strength of the structure.
For the construction of columns, foundations and reinforcement dams, the best option is to increase the structural strength.
Methods of fastening rebar by wire
The shape of the bars in the reinforcement plays an important role in the concreting and for the concrete to reach different points. When constructing columns that use large-size rebar, try to allow more space for the reinforcement and molding to reach the concrete. For lower parts of the reinforcement, insulation should be used to prevent soil moisture from reaching the structure and destroying it. Before concreting, the reinforcement must be checked by the engineers as it may be torn as a result of relocation or other wire construction work. Therefore, if the wire is loose or loose the wires should be re-closed. Reinforcing bars are closed in two ways:

The Crucifixion Method
In this method, the two bars are placed over each other and the wires are crisscrossed below and above them. The ends of the two ends of the wire are then screwed together using pliers. Finally, the excess wire is bent downwards so that the tip of the wire does not cause any problems.

Reinforcement of concrete structures

Closure method
In this way, when the bars are mounted on each other, the wire is passed underneath the lower bar and closed after passing through the upper bar. This method of closing the rebar is called the Croatian method and is used for roof reinforcement and building foundations.

Concreting
Molding and concrete is the last step in reinforcement. The molds chosen for pouring concrete are metallic because they prevent the water from leaving the concrete. Concreting depends on factors such as weather conditions, construction site, desired land condition and concrete location. Ready-mixed concrete is used in bulk casting because it is of the required quality.

Important tips in reinforcement
Reinforcing is a very specialized job and should always be monitored carefully. Sometimes fittings provide wake resistance, so supervisory engineers must be supervised before reinforcement for foundation. The construction of concrete structures using reinforcement requires some of the following:

They are called bamboo transverse bars and their task is to maintain longitudinal reinforcement, so the principles and criteria must be observed when bending.
The reinforcement shall not be bent below 2 ° C.
The bent reinforcement should not be opened or closed.
Bending of the bars is done using a cold mechanical device.
The bars should be cut using special scissors.
The distance between the barrels should be twenty centimeters.
Oil-coated, rusted or contaminated reinforcement should not be used. They must be cleaned before the project can be implemented.
Environmental conditions must be considered when installing reinforcement.
Reinforced concrete approved by engineers should not be changed prior to concreting.
When formatting, the gap between the bars and the mold wall must be observed as failure to observe this distance will result in damage to the foundation.
Bending of reinforcers by the airbag should be avoided.
Opening and closing bends should be avoided to reshape them.
The thickness of the coated concrete shall not be less than the diameter of the reinforcement.
Reinforcements used for reinforced concrete structures should be prepared on a map basis.
Coverage thicknesses are not required for floor and ceiling reinforcement that is not subject to transpiration if the monitoring device agrees.
The distance between parallel bars shall not be less than 1.5 cm from either side.
More than half of the reinforcement in bending and pressure components should not be patched at one point.
The distance between each patch to the adjacent patch should be 3 times the diameter of the reinforcement.

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