Mesh preparation is an essential part of the Bar Bending Schedule (BBS) for footing construction. Proper mesh preparation ensures the strength and stability of the foundation. The mesh acts as a reinforcement that distributes the load and prevents cracks.
What is Mesh?
Mesh refers to the grid of steel bars or wires used for reinforcement in concrete structures. The mesh provides additional strength and stability to concrete structures, especially in footing, where heavy loads are applied.
Why is Mesh Preparation Important?
In the BBS for footing, mesh preparation is crucial as it helps in distributing the load evenly. It prevents the concrete from cracking and provides structural integrity to the footing. Proper mesh preparation ensures that the reinforcement is correctly placed in the footing to withstand the weight of the building.
Steps for Mesh Preparation in Footing
Below are the steps for mesh preparation in BBS for footing:
Step 1: Measurement of the Footing Area
First, measure the area of the footing where the mesh will be placed. This includes the length, width, and depth of the footing.
Step 2: Selection of Mesh Type
Based on the load-bearing capacity, select the appropriate mesh type. Common types include welded wire mesh, fabric mesh, or steel bars.
Step 3: Cutting the Steel Bars
Cut the steel bars to the required lengths based on the BBS. Make sure the bars are cut with precision for proper alignment and strength.
Step 4: Placing the Mesh in the Footing
Lay the mesh inside the footing formwork. Ensure that the mesh is placed at the center of the footing to provide equal distribution of load on all sides.
Step 5: Tying the Bars
Tie the steel bars at the intersections to form a grid. Use binding wire to tie the bars securely and ensure that the mesh remains in place during the pouring of concrete.
Step 6: Inspection
Inspect the mesh placement and tie quality to ensure proper reinforcement. Ensure that there is no gap in the mesh and that it is well-aligned with the formwork.
Example of Mesh Preparation in Footing BBS
Let's consider a footing with the following dimensions:
Length of footing: 2 meters
Width of footing: 1.5 meters
Depth of footing: 0.5 meters
We need to prepare mesh with the following steps:
Cut steel bars of length 2 meters for the length and 1.5 meters for the width.
Use 10mm diameter bars for the main reinforcement.
Place the mesh in the center of the footing, ensuring it is correctly aligned and tied at all intersections.
This mesh will provide the necessary reinforcement for the footing to withstand the load.
Conclusion
Mesh preparation is a vital process in the construction of footings. It enhances the strength of the footing and ensures the durability of the structure. Following the proper steps for mesh preparation will lead to a solid foundation that can support the building safely.