Masonry Magazine June 1983 Page. 10
MAYCO
THE ONLY WAY TO
PLACE GROUT ON
MULTI-STORY, LOAD
BEARING MASONRY
CONSTRUCTION
HEAVY
DUTY
DRIVE
MAYCO C30HD
SMALL LINE GROUT & CONCRETE PUMP
... THE 'WORK HORSE'
OF THE INDUSTRY
* Handles mixes with up to 12"
aggregate.
* Remote Control Flow of material
controlled at point of pour.
* 3-Speed volume selector.
* Will pump in excess of 100' vertically
and 400 to 500' horizontally.
* Versatile Can also be used for
pumping slabs, footings, foundations,
light weight cellular concrete floors,
high lift grouting and shotcreting.
ASK ABOUT OUR PROGRAM FOR STARTING A CONCRETE
PUMPING SERVICE A DYNAMIC WAY TO DIVERSIFY.
For information & location of your local Mayco
distributor, Contact:
MAYCO PUMP CORP.
4640 Sperry Street/ Los Angeles, CA 90039
Phone: (213)240-7070
10 MASONRY-MAY/JUNE, 1983
NORWEGIAN BUILDING
continued from page 9
porarily filled with concrete to add further strength to the
structure and allow larger distances between jacking points
when lifting.
Creating a Concrete Raft
In underpinning operations, new construction was carried out in sections, allowing the strengthened basement walls to support themselves laterally over the underpinning excavations. Adjacent sections were joined by connecting bars with steel connectors, creating a flat, concrete raft which became the new foundation. Forty-one 60- and 90-ton Pynford hydraulic jacks, remotely controlled in groups, jacked up the building by 25 centimeters and leveled old, uneven settling.
Sliding on Grease Skates
Pynford's grease skates allow large buildings to "float" on a very thin layer of grease, pumped out at high pressure from the base of the skate to form, in effect, an elasto-hydrodynamic suspension system. Controlled movement of the Seamen's Hostel was provided by four double-action jacks, mounted horizontally between the new concrete raft and the existing basement wall. Sideways slip was eliminated by roller-bearing stabilizers acting against steelwork constructed at the sides of selected guide tracks.
The moving operation was performed in two stages: at the end of the first 3-meter slide, the building was secured, then each track extended by 1 meter and left to cure for 48 hours. After the remaining 2-meter slide was completed, the building was re-secured and the grease skates removed from the jacks. Lifting proceeded in 15 centimeter steps, pausing at each step to introduce packing under the jacking points. The packing was eventually cast into the permanent structure as reinforcement.