Oct 09

The Schwing SP1000 – The Workhorse of the Concrete Industry

We are featuring this pump because it is one of the toughest, most reliable fuel efficient trailer concrete pump on the market. It is without any doubt one of the best built pump. This shouldn’t come as a surprise from Schwing, the company who invented the first concrete pump and as a result revolutionized the entire industry*.

So what makes this machine so great? It can pump 70 cubic yard per hour, it produces 1100 psi maximum pressure and uses a maximum aggregate size of 1.5 inch.

It is powered by a 139 horse power diesel engine, 35 pump stroke per minute max. This all-hydraulic concrete pump provides optimal fuel efficiency. Its lack of electronics makes it ideal for projects for humid regions and cold locations like Alaska, British Columbia. The hydraulic system is open loop, produces 4350 psi. It comes with a 70 gallon hydraulic tank, a standard hopper agitator and a 11 cubic feet hopper. The trailer unit also comes with a remote control and a 100 foot cable that  convenient to the operator and weighs 7580 pounds.

The Long Rock Valve™ provides better filling efficiency for the material cylinders. It can handle harsh mixes, shotcrete and grout and allows for a fast clean out with less water.

What is this pump designed for? Bridge work, apartment building, high rise work. Remember, it can pump over 1000 ft and over 400 ft straight up!

Dick Hibbard

Learn more about this amazing pump in this short video: Discover the Schwing SP1000X.
Call Dick Hibbard at (503)283-2105 if you were thinking of buying one or just to find out about our best deals on new and used concrete pumps.

 

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May 09

Milestones in Concrete Construction

We thought we would take a trip into the past to find out some of the major milestones in the history of concrete construction. After all, how can we appreciate the technologies we have today, without knowing the work that countless individuals have contributed to this industry by giving their lives, passion and vision to better our world. The timeline below is by no mean everything but covers some of the most important milestones.

12,000,000 BC – It turns out that cement compounds can be found as a result of a natural process where limestone came in contact with oil shale in a process of spontaneous combustion. It was discovered in Israel.

5600 BC – First form of concrete discovered in Europe in the region of the Danube River in Yugoslavia. It was used to make floors in stone age huts providing a major upgrade in the quality of life for hunters and gatherers.

3000 BC – First known use of concrete-like material in China with the building of the Great Wall. Made from a mix of sand, pottery shards, bones and water, this cement was greenish-black.

Egyptian pyramid

2500 BC – The practice of binding bricks using mud mixed with straw appears. The addition of lime and gypsum mortar to the process can be seen in the Pyramids in Egypt.

800 BC – The first use of bitumen (a.k.a. asphalt), a semi-solid form of petroleum that can bind stones with bricks is credited to the Babylonians and Assyrians.

600 BC – Use of the first concrete that can harden under water and in the air was made by the Greeks, thanks to the discovery of pozzuolana (a.k.a. pozzolan or calcined lime) on the Island of Santorini.

Roman Colosseum

82 AD – The Colosseum in Rome is completed using tons of Roman concrete which bears no resemblance whatsoever to Portland cement, since it is never in a plastic state and is more like cemented rubble made by manually packing mortar around stones of various sizes.

AFTER 400 AD – With the fall of the Roman Empire, the art of concrete is lost for almost 1300 years, reverting to lime based mortars and concrete.

1756-1796 – Multiple patents are filed in England for hydraulic cement (stucco), hydraulic lime etc.

1825 – Creation of the Erie Canal launching the need for cement in the United States using hydraulic lime.

1828 – First application of Portland cement used to seal breaches in the Thames Tunnel.

1850s – Building of the first concrete roads in Austria, England, other European countries and the US.

1850-1880 – French builder, Francois Coignet popularizes the use of concrete in construction.

1856 – First patent filed for the use of reinforcement in concrete using iron bars and wire mesh in small rowboats by French gentleman farmer named Jean-Louis Lambot.

1891 – First concrete streets built in the US, in Ohio.

1904 – First concrete skyscraper is built in Cincinnati, Ohio.

1905 – The National Association of Cement users is created, which will later become the American Concrete Institute.

1911 – Shotcrete is invented, allowing for the first time placement of concrete on vertical or horizontal planes.

1913 – The first concrete pump patent is filed.

1936 –  The Hoover Dam and the Grand Coulee Dam, are the first concrete dams built.

1970s – The first fiber reinforced concrete appears on the market.

1983 –  Invention of Syndecrete™, a light weight concrete that combined cement with recycled materials such as coal fly ash (a byproduct of coal plants) with polypropolene fiber to provide reinforcement (from carpet manufacturers). The finished product is used in kitchen countertops, tile flooring and more.

1985 – Introduction of silica fumes or micro silica into cement to produce the strongest concrete with very low permeability.

1995 –  Insulated Concrete Forms (ICF) are being introduced to build homes and to hold concrete, providing greater insulation (temperature and sound) than common stud walls.

Concrete pumping has grown to become a vast industry that keeps expanding its boundaries, and possibilities. Looking back over the timeline, it is interesting to see that French and British have contributed a great deal to the progress of concrete in construction and Ohio leads the way in the US! So, it isn’t surprising that the American Concrete Pumping Association is based in Ohio!

Stay tuned for a future article on newer developments in the world of concrete and what the future of concrete holds. Until then, if you are looking for a great deal on a concrete pump for your next job, why don’t you give us a call at (503)283-2105. With over 40 years of experience in the industry, we can help you solve challenges and work within your budget. We always love to hear from you.

Suggested further reading:
http://excavatorheavyequipment.com/blog/2013/06/03/plaster-used-by-ancient-builders-still-used-today/

https://fp.auburn.edu/heinmic/ConcreteHistory/Pages/timeline.htm

Mar 07

Best Concrete Pumps for Building a Gunite Pool

Luxury pools

Since we are experiencing one of the worse winter in decades in most of the US, we thought we would talk about swimming pools! Native Americans do rain dances during droughts, we will invoke milder weather through visions of gorgeous swimming pools!

In terms of types of swimming pools, gunite pools are, by far, one of the most popular types of pools built in the US. One of the reasons is that they are super durable and can be built in any shape or size. To build a gunite pool there are basically 9 steps you must follow, they are:

  1. Obtain permits
  2. Design layout
  3. Excavate
  4. Put plumbing in place
  5. Assemble & lay the steel framework
  6. Spray the concrete shell
  7. Apply finish coat
  8. Lay Tile/coping stone
  9. Place decking and pool finish

Since they are many other good articles that cover steps 1 through 4 and 8-9, we will focus on the gunite process itself. Once the framework grid has been assembled and laid (using 3/8 inch steel rebars), you are now ready to spray a thick coating of gunite (a mixture of cement, sand and water), around the reinforcing rods that are usually spaced 10 inches apart and secured by wire. The concrete sprayer machine combines the dry mix with water just before spraying.

After the shell is applied, a crew will smooth out the surface using trowels and let it sit for about a week before adding a finish coat because the surface will be rough and uncomfortable to the touch. At this point, some companies wet down the shell once or twice a day for a week to help the curing process. There are many types of finish like tile, fiberglass but plaster is one of the most popular ones (a mixture of marble sand and cement), and concrete paint is another good option.

Now that we are a little clearer on the overall process what are some of the best concrete pumps for the job? We recommend the following:

The Mayco LS-400 Concrete Pump

Mayco LS400

 

 

 

 

 

The Olin 545-65 

Olin 565 Concrete Pump

 

 

 

 

 

 

The Reed B50 HP 

A Reed B50 ready to ship

 

 

 

 

 

 

 

The Schwing BPA 450-500

Schwing BPA-500 concrete pump

 

 

 

 

 

 

 

The Putzmeister TK40-50

Putzmeister TK40

 

 

 

 

 

 

 

So, why these pumps?
First, they are all medium size pumps, so they can easily being towed behind a pickup truck carrying all the needed hoses and accessories.

Second, these models are not only easy and quick to setup, they also have a low hose pulsation, meaning the hose doesn’t vibrate or shake very much and greater safety for the crew.

In terms of power, they can output 7-15 yards per hour, so you will have more than you need.  Another important advantage these four models offer is the ability to pump long distances, no matter how far your ready mix truck happens to be parked on the street. You get perfect mobility which is always a plus for this type of job.

Still have questions? Don’t be shy! Just call Dick Hibbard at United Equipment Sales at (503)283-2105. He can help you solve problems,  find the perfect machine for your next job! Or visit: www.Unitedequipmentsales.com for more details.

Dec 13

United Equipment Sales Saves The Day in El Salvador!

We all know that building tunnels can be challenging! But making sure they don’t leak can turn into a real nightmare.

We were recently approached by a construction company in El Salvador that had built a 4000 feet tunnel but ran into a big problem when ground water started running down the hill and eventually leak into the tunnel through the rocks.

Tunnel Repair Engineering Drawing

The company first hired a contractor who ended up charging them 1 million USD but failed to fix the problem. Then, they contacted us to see if we could help them find a solution to their problem and work within their budget and source the appropriate equipment for the job.  After a series of meetings with their team of engineers going over the site, dimensions, challenges, limitations, we were able to together design a plan that not only would incorporate a permanent fix, work within their budget but also save them over $150K! This was achieved not only with the equipment we sold them but with the actual solution we came up with. In today’s economy, any savings goes a long way, but $150K, for any construction company is pretty extraordinary!

Worthington 650 CFM compressor

One of the reason the previous contractor didn’t succeed in fixing the problem was that he didn’t use a large air compressor. We suggested and sold them a Worthington 650 CFM compressor that would do the job. The compressor will be placed at the end of the tunnel connected to 4000 feet of heavy duty concrete pipes to be able to cover the length of the tunnel.

Concrete Pipes

So we prepared 400, 3”x 10” feet sections and equipped them with clamps.

Then, we devised a solution for shotcreting the tunnel wall. It required both a Blastcreeter 5000 and a Reed C50HP pump to get the job done.  To shotcrete the seams of the rocks, they would need to mix the concrete with a Bobcat at the end of the tunnel, then dump it into a mixer to mix it up, then dump it into the high pressure concrete pump’s hopper.

Reed C50 HP

The Reed C50HP can shotcrete 1000 to 2000 feet with a robot arm.  The pump is also equipped with a shotcrete nozzle 650 CFM, using air pressure to blow wet concrete between the rocks. The pump would be moved 1000 feet at a time through the tunnel until the job is completed.

Blastcreeter 5000

So how were we able to not only solve their problem but also save $150K? We will do the math for you. A Blastcreeter 5000 costs about $60K new, we were able to sell them a refurbed one for $30K. A Reed C50HP, goes for $106K brand new, we had a used one on our lot for $42K. That’s almost $100K of savings, right there. The solution we came up with also saved them an additional $60-90K, because we worked it out so that they only had to purchase 2 pumps instead of 4.

This is a great example showing how combining real expertise on the ground, with in-depth knowledge of equipment performance with the ability to source discounted dealer certified refurbed equipment, can make the difference in a bid won and a project executed in time and within budget.

Do you have a tricky concrete job or a problem to solve? Check out our Troubleshooting article, our special deals on shotcrete equipment   or call us at 503- 283-2105, we can work with you on any job you have. Give us a chance and we will show you how you too can save and deliver quality results!
Or visit us at: Unitedequipmentsales.com to check our latest deals.