I believe that the tower will be used to lift concrete rather than set pipe. On the lower left of the tower is a chute commonly used on concrete transit trucks. That chute is lined up with one of many permanent chutes seen within the tower. At the extreme left it appears that form work and rebar are being readied for a pour. The right side of the tower would guide the concrete bucket to the correct level being used, then dump through the tower into the long chute and into the forms. As the construction reached higher it would be a simple matter of raising the chute to the next higher step on the tower. All this has been replaced by special concrete pumps and large hoses to place concrete.