Masonry Magazine October 2003 Page. 32
PUMPS
Using a pump also gives the masons the ability to work independently and without the use of expensive cranes.
rial to the site and, in case of work stoppage, the wait time of a ready-mix-truck can become expensive.
Mixing Pumps with Silo Systems
IN CASE THE DRY MORTAR is delivered in a silo system to the site these systems become even more economic and environmentally friendly. These are closed systems in regards to dry materials; therefore, no dust contamination will occur and there are no paper bags on site.
By attaching the mixer or mixing-pump to the silo it is possible to use higher output equipment as the material is flowing on its own from the silo into the machine and manual lifting and opening of bags is avoided. Only one worker is needed to operate the full system and no one is needed for feeding or transportation.
The use of the right combination of material, pump and mixer helps to save time and labor and makes construction faster and more reliable. A contractor can finish a job with fewer people and use his or her crews to do more jobs in the same amount of time. Using a pump also gives the masons the ability to work independently and without the use of expensive cranes. Pumps help to deliver material fast, safely and in the right amount when and where it is needed.
30 Masonry
October 2003
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PUMPING UP THE JOB SITE
According to Schwing dealer Mack Hanbury, vice president of sales at Cross Enterprises, Orlando, Fla, pumping grout makes a lot of sense for mason contractors on a time-equals money basis.
"It's a very low investment; typically, for $18,000 you can own the pump, all the hose and accessories needed. If you needed to grout 10 yards of cell fill and you're on the second or third floor- even on the ground floor - if you didn't pump it you'd have to use anywhere from five to six workers to do it in a timely manner. You only have so long with the concrete on the truck, typically 90 minutes from batch time. You must have that concrete placed within the 90 minutes, including the transport time from when truck leaves the batch plant."
He adds, "It would typically take eight or nine workers about an hour and half, if not more, to wheelbarrow and bucket even 10 yards. If you use a crane and bucket on cell fill, it's very messy and you loose time cleaning up. With the concrete pump you can place 10 yards of cell fill in about 45 minutes. You're putting the hose directly in the cells so you know it will be fully filled. There is very little mess and three workers can do it in most applications."
Pumps like the Schwing P-88 are rated for 150 feet vertical lift, based on type of mix being used. Hanbury says, "I would recommend that people stay around 10 or 12 floors - I've pumped up 16 floors, but that was very special circumstances. I would not try to sell a piece of equipment by telling people it could do that. You can run up to a three-inch hose with the P-88, but typically you use two-inch hose because it is easier to handle. There are some applications, especially in Florida - we have a very good pump mix in Florida where people are using inch-and-a-half hose. You have to make sure you have a very good ready-mix company and you're not getting any larger rocks mixed in with the small pea rock that these pumps are made to handle."