#MATL, 15 bytes

    '_|__'700:)70e!

Of course, you can [Try it online!](http://matl.tryitonline.net/#code=J198X18nNzAwOik3MGUh&input=)
Explanation:

    '_|__' % Put a brick on the stack
    700    % 700 times
    :)     % Makes a happy mason...
    70e!   % Secret freemason code

OK, actually, it works as follows:

    '_|__' % Put the first bit of the string on the stack
    700:   % Put 1, 2, ..., 700 on the stack as array
    )      % Index into the string, modularly. Result: '_|___|__ ... __'
    70e    % Reshape into 70 rows (and consequently, 10 columns)
    !      % Transpose to get the desired output.