How to pass table name to the query?

Before I am passing the table name and its alias directly to my query.
$qry = DB::table('tbl_user as u') ->join ......

But now I have to pass the name of table dynamically.

$this->tableName;

I tried as follow

$qry = DB::table($this->tableName + 'as u')

But it didnot work for me.

Any Help please.

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