OrderBy in varchar containing integer

I have a column of type "varchar" but it consists of integer.

When I make a query with orderBy, it results like below.

10
11
12
9

I have implemented orderBy like below:

->orderBy("stdmap.prvid");

When I run query directly in phpmyadmin with order stdmap.prvid+0, it is giving me correct result. But I am not sure how to add +0 in laravel query.

via Chebli Mohamed