Making the Levelling Pad on Excavation pit.

 There are several ways to make levelling pad, for any RE Wall on the excavation pit. You can make a curved levelling pad, straight levelling, one step up-&-one step down etc. But in my case the curve levelling pad is followed, as the RE Wall structure will be in curve position 😂. 

And so levelling pad is also made like this, as per the drawing. 

Levelling pad is made curved. This is the image of backfill after making the levelling pad. 

So levelling pad is made like this. Now the steps to follow to make a levelling pad are as follows : 

First you do excavation. And for doing excavation you can read this article. All steps and process were described briefly. You can do excavation either by JCB or with Falkland also. Since the excavation is large and long, you cannot do by hand-made labors. It will take more time and as well as more economy will also be lose. So to do these type of excavation machinery equipment is used. 

After making excavation, you go for the ground improvement work. All these steps were given in brief in that article. Because without ground improvement, no above structure work can be done. Because it keeps a barrier between above soil and below soil. So that it can maintain their plastic limit and doesn't mix with the below soil. Because in below soil liquidity index is more, and as a result capillary rise of water will be more. So to avoid this capillary rise of action in water, this ground improvement work is done. 

And after doing this ground improvement work and filling up with GSB, the main work begins. You arrange the labors and tell the supervisor's about the work how to do, how to maintain & how to make alignment of all. Then they will carry out the work, and you sometimes-sometimes look at it whether their way of doing work is proper or not. The labors will handle all of these, only just you need to advice what do to step-by-step. And also for the supervisor's also, how bring the work forward/ in progress. 

First where the PCC will be done, level it with the help of levelling staff by Auto-Level. After that excavate it or cut the GSB (if it's excess) below 150mm down where the level is done. So that PCC can be maintained at the same level. So after doing all these works fill the cutting area with GSB if water is present or dewater it. Then bring the shuttering plates and place it where the PCC will be done. 

 

And after giving all these shuttering plates you know the further process what to do. Just think about for a minute!!!!!! So, I think maybe you have guessed the right. It's about concreting. To prepare the mix of the concrete. Well, but the grade should be M15. You make these concrete mix either in mixer machine or in Ajax Fiori. And then do the concreting work. 

OR

AND AFTER THAT 

So this is the only step by step process to do the PCC work for the Levelling pad. But before doing PCC you see that whether all the dimensions are correct or not? Whether the PCC is at required position or not? Not only these, you see whether the level is maintained or not for the PCC work. You do one thing, take a thin rope (or say suta, called in our local languages) and tie it from one end to the other to do the PCC at proper level. Like this, you can see at the image. 

After doing all this you PCC is ready. And the very next day you can see it whether the PCC quality is good or not and if it's cured or not. So this is how the Levelling pad PCC is made. And after that you go for further process, such as marking the center line of PCC to fix the panels, doing backfill etc. and etc. 

Thank you 💝.