About Amerisurv| Contact    
Magazine | Newsletter    
Flickr Photos | Advertise    
HomeNewsNewsletterAmerisurv DirectoryJobsStoreAuthorsHistoryArchivesBlogVideosEvents

Sponsored By

Software Reviews
Continuing Series
An RTN expert provides everything you need to know about network-corrected real-time GNSS observations.
Click Here to begin the series,
or view the Article PDF's Here
76-PageFlip Compilation
of the entire series
Test Yourself

Got Answers?
Test your knowledge with NCEES-level questions.
  Start HERE
Meet the Authors
Check out our fine lineup of writers. Each an expert in his or her field.
Wow Factor
Sponsored By

Product Reviews
Partner Sites







Spatial Media LLC properties




Home arrow Archives   The American Surveyor     

Technology Edge Streamlines Giant Concrete Pour Print E-mail
Written by Vicki Speed   
Saturday, 27 October 2012

A 1.426Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

The highly anticipated beachfront Seacoast Inn located near Imperial Beach, San Diego will incorporate luxury suites, a spa, restaurant and other specialized services within a traditional four-story, wood-framed structure, underground parking garage--and an impressive foundation. The 200-ft x 238-ft foundation is unique in that it is built on a 27-inch thick mat slab, instead of the more typical 3-6 inches, pushing Lusardi, the general contractor, to apply innovative tools and techniques to meet the project's tight timelines and engineering requirements.

The thicker, reinforced slab will hold back the high water table created by the hotel's close proximity to the Pacific Ocean. In addition, the slab required a number of drains which created numerous ridges and valleys to insure effective drainage.

Stephen Mayes, field engineer with Lusardi, says, "The crux of the problem was in the required ridges and valleys. We needed to place the concrete and screed to achieve the elevation changes called for in the design, all while completing the job as quickly as possible. The ridges and valleys sloped to drains with percentages of 1.5% to 2%. In fact, some of the elevation changes came to as much as four inches."

Conventional methods for layout, preparation and pour would have required that carpenters construct a number of forms and cold joints to account for the ridges and valleys. Unfortunately, this technique would have taken 3-4 days to set up, while creating additional time-consuming problems. For instance, the team would have had to figure out how to get the screed hooks out of the ground. Screed hooks or conventional methods for concrete screeding usually require some kind of anchoring into subgrade. Anchoring was not possible on the hotel foundation to avoid costly damage to waterproofing systems.

Instead, Lusardi put together a plan to place and finish 4,150 cu yds of concrete in one pour without cold joints and at the correct elevations--in just 13-hours. The contractor put together a highly skilled team to pour, screed and smooth the concrete, equipment that includes four large pumps with booms able to span over 250 ft, 400 concrete trucks and a Trimble robotic total station.

Prior to the pour, Mayes used the architectural 2D model of the foundation to locate about 200 control points. He then downloaded the points from the model to the Trimble® LM80 handheld controller, which was connected to a Trimble® SPS710 robotic total station. In the field, he shot the elevations and the high points. Ridges are the high points in the pour with valleys sloping to the lowest points in the pour (drains).

On September 14, the first of 400 cement truckloads began arriving at the site from 4:30 a.m. to 6 p.m. As the wet concrete pumped from the trucks, Mayes and his robotic total station moved in position to see whole project. Throughout the pour, he moved from one end of the foundation to the other checking elevations with the total station until the entire foundation surface was smoothed and leveled per the engineering requirements.

Mayes says, "Our challenge was to stay within one-quarter inch tolerance across the entire surface--which we were able to maintain because of the robotic total station's mobility and digital data management. As I went back to perform layout of columns and masonry walls, I spot checked elevations and they were all within tolerance. On a project like this, with numerous ridges and valleys, the model-to-field connect is the only way to ensure speedy, accurate results."

Vicki Speed is a freelance writer based in Denver, Colorado.

A 1.426Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

< Prev   Next >

 American Surveyor Recent Articles
Thought Leader: Land is Too Important to Be Left to Land Specialists
A while back I was searching the Internet for an old treatise on land titles. A Google query yielded a book published in 1914. The author was Charles Claudius Kagey and the book was titled "Land Survey and Land Titles, a book for boys and girls, a reference volume for property owners, a text ....
Read the Article
Jason E. Foose, PS 
Decided Guidance: Wacker vs. Price - Irony in Sevenfold
This month's case takes us to Phoenix, Arizona in 1950. The Arizona Supreme Court went all guns-a-blazin' in Wacker vs. Price (216 P.2d 707 (Ariz. 1950)). Maybe it's just me, but I'm sensing plenty of irony and have taken license to point it out along the way. I like what the Court did with this case ....
Read the Article
Allen E. Cheves 
Around the Bend - A Visit to Carlson Software
The Ohio River is one of America's greatest, running near 1,000 miles between Pittsburgh and the Mighty Mississippi. Much of the coal and other products that fueled our nation's industrial expansion flowed between the shores of this maritime ....
Read the Article
Lee Lovell, PS 
Surveying & Mapping Economics Part 3 - Customers & Services
This article continues an inquiry into the economic conditions of the Surveying and Mapping industry (NAICS 541370) using data from the U.S. Census Bureau. This time we will look at customers and services. The data comes from the Economic Census conducted every 5 years on American ....
Read the Article
Jerry Penry, PS 
True Elevation: Black Elk Peak
Black Elk Peak, located in the Black Hills region of South Dakota, is the state's highest natural point. It is frequently referred to as the highest summit in the United States east of the Rocky Mountains. Two other peaks, Guadalupe Peak in Texas and ....
Read the Article
Larry Trojak 
Bringing The Goods - Mobile Scanning an Integral Component
When Jim Smith, Jerrad Burns and Charlie Patton left the Memphis division of a major construction company in 2015, they took with them the knowledge of how to get even the most complex jobs done and what equipment could best serve them in making that happen. So when they joined West ....
Read the Article
Lee Lovell, PS 
Test Yourself 41: Integers, Integers, and Integers
ABF is a 5:12:13 triangle, ACF is a 48:55:73 triangle, ADF is a 3:4:5 triangle, and AEF is a 7:24:25 triangle, all with integer sides and inscribed in a semi-circle. What are the lengths of BC, CD, and DE? ....
Read the Article
Wendy Lathrop, PS, CFM 
Vantage Point: Sunset or Sunrise?
While we often think of legislated government programs as static, they do change over time. Such evolution and opportunity for transformation are part of the dialogue in reauthorizing these programs. Every so many years there is a sunset on each government program, and this September is the ....
Read the Article


Amerisurv Exclusive Online-only Article ticker
Featured Amerisurv Events
List Your Event Here
contact Amerisurv


JAVAD Intros
Spoofer Buster

press [at] amerisurv.com
Online Internet Content


News Feeds

Subscribe to Amerisurv news & updates via RSS or get our Feedburn
xml feed

Need Help? See this RSS Tutorial

Historic Maps

post a job
Reach our audience of Professional land surveyors and Geo-Technology professionals with your GeoJobs career ad. Feel free to contact us if you need additional information.


Social Bookmarks

Amerisurv on Facebook 

Amerisurv LinkedIn Group 

Amerisurv Flickr Photos 

Amerisurv videos on YouTube 



The American Surveyor © All rights reserved / Privacy Statement
Spatial Media LLC
905 W 7th St #331
Frederick MD 21701
301-695-1538 - fax