Go to 'database\illuminate\Database\Capsule\Manager' class and add this lines!
/**
* Get a fluent raw query expression.
*
* @param mixed $value
* @return \Illuminate\Database\Query\Expression
*/
public static function raw($value) {
return static::$instance->connection()->raw($value);
}
Now you can run $capsule->raw('INSERT INTO ....');
https://github.com/illuminate/database