ParsCo review of the World's Largest Concrete Pour Scheduled in Los Angeles

ParsCo Construction (Pensacola, FL) prides itself in having extensive experience in completing massive structural concrete projects and high-rise construction.  ParsCo knows the blueprint for the successful execution of a project is as important as the blueprint for the project itself. That's why we develop accurate construction plans, as well as efficient, thorough, complete, and cost-saving construction management methods. All of which are extremely critical when preparing for a world record concrete pour. 

 

ParsCo recently reviewed and evaluated the first high-rise project in Los Angeles in more than 20 years, which will include a foundation system that is expected to break the Guiness Book of World Record’s largest concrete pour in the world.  The Wilshire Grand project is a 73 story project that will include offices, retail, and hotel rooms and is expected to be completed in 2017.  Turner Construction is the General Contractor, and in conjunction with Los Angeles based architecture firm AC Martin and Engineering firm Brandow and Johnston, completing a continuous pour to complete the  concrete foundation was considered the most economical way to do the project. 

 

 

So just how massive is this concrete foundation?    The total concrete pour volume is estimated at 21,200 Cubic Yards (CY).  CalPortland, the concrete supplier, is expected to utilize 208 concrete trucks to each make 10 deliveries from one of nine batch plants.  Turner will mobilize 19 pumps which will dispense the concrete through 13 different hoses into the pit.   The entire pour process is expected to take 30 hours.  The pit is reinforced with nearly 7 million pounds of reinforcing steel and the total estimated weight of the concrete will be 84 million pounds. 

 

So how large exactly is the foundation and the building?  The pit is estimated to be 18 feet deep and nearly two-thirds the area of a football field. The project will be the tallest high-rise west of the Mississippi River. 

 

1 ParsCo Construction High-Rise

One major task in being able to complete a concrete pour of this magnitude was to develop a system that would cool the concrete heat of hydration (exothermic reactions) enough for it solidify.  This was accomplished by installing nearly 19 miles of plastic tubing throughout the foundation to pump refrigerants through the mass for a period of 2 weeks. 

 

 

This project is no small task, and careful review and evaluation was required to plan this activity.  Because of the magnitude and costs involved, the main topics of consideration that required planning with back-up contingency plans were:

1)       Sourcing materials – concrete batch plants within 20 miles of site – 8 to be used with one backup

2)      Access from batch plants to site – concrete needs to be placed within 90 minutes of being batched

3)      Pump trucks – having on-site 18 trucks with one backup

4)      Cooling system to achieve proper strength of materials

5)      Design considerations and how to make project a reality utilizing real-world means/methods available to construction crews today

 

 

For more information on how to involve ParsCo in planning, reviewing, and building your next construction project, call us at 850-696-7656 or info@parscoconstruction.com.

 

Visit us on the web at www.parscoconstruction.com

 

 

ParsCo Construction solves Common Surveying Errors

Common Surveying Errors

 

 

Surveying or land surveying is the technique, profession, and science of accurately determining the terrestrial or three-dimensional position of points and the distances and angles between them, commonly practiced by licensed surveyors, and members of various building professions. These points are usually on the surface of the Earth, and they are often used to establish land maps and boundaries for ownership, locations (building corners, surface location of subsurface features) or other governmentally required or civil law purposes (property sales).

It is an important function in today’s world, and not just for construction.  More and more people utilize GIS systems and don’t even realize it.  A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographical data. The acronym GIS is sometimes used for geographical information science or geospatial information studies to refer to the academic discipline or career of working with geographic information systems and is a large domain within the broader academic discipline of Geoinformatics.

A GIS can be thought of as a system that provides spatial data entry, management, retrieval, analysis, and visualization functions. The implementation of a GIS is often driven by jurisdictional (such as a city), purpose, or application requirements. Generally, a GIS implementation may be custom-designed for an organization. Hence, a GIS deployment developed for an application, jurisdiction, enterprise, or purpose may not be necessarily interoperable or compatible with a GIS that has been developed for some other application, jurisdiction, enterprise, or purpose. What goes beyond a GIS is a spatial data infrastructure, a concept that has no such restrictive boundaries.

So for those of you that don’t realize it, you utilize GIS systems everytime you use your GPS system, your SmartPhone Map system, or even Google Earth or other online based web-based map viewer system. 

Surveying data is the backbone for GIS systems and often errors in the collection of this data is encountered.  Errors can be generated from the collection or recording.  In our blog today we will address some examples of common surveying errors and solutions.

 

PAPER STREETS

A helpful term for layman is to understand what surveyors refer to as  “Paper Streets”.  Paper streets are roads that have not been constructed, yet appear on the record.  Many times in areas that have little infrastructructure, lots and properties abut the paper streets.   The paper streets can actually run across residential lawns, down steep ledges, and through swamps and wetlands.  The issue at hand is that many times these “paper streets” are contrary to the property owner’s deeds.

This is a common issue, and ultimately  a court may have to decide to deal with the “paper street”. 

 

PROTRACTED SURVEYS

Another issue that is very common is a “protracted survey”.  A protracted survey is a subdivision plan that portrays any number of  lots without the benefit of field measurements.  Typically, they show no survey markers or monuments within the subdivision and as a result, surveyors have difficulty retracing any of the lots shown on the plan because there is nothing to measure from.  Other deficiencies in these plans are missing angular measurements, and distance measurements that display values rounded to the nearest foot. 

Protracted surveys were common between 1920 and 1950.  Thanks to licensing procedures and strong regulations, these surveys are no longer produced.  Nevertheless the legacy lives on.  Deeds still refer to these plans  in their legal descriptions.  It is not uncommon to find “pincushion corners” in these subdivisions.  Pincushion corners often lead to boundary disputes and if they are not handled properly, they can lead to costly litigation.

 

PINCUSHION CORNERS

One of the most frustrating and perplexing phenomena in the practice of land surveying is the presence of more than one marker representing the same lot corner.  This occurs when inexperienced, unlicensed, or uncaring surveyors are involved in the survey.  It is frustrating to the surveyors who mark the corner; and it confuses the client and the abutters (neighbors).  This issue always leads to an argument. 

The most common practice in solving this issue, is for the surveyor to identify and relate the corner in question to at least three record markers (survey monuments).  Unfortunately, this is not always possible.  The most difficult surveys are those that have no record monuments to which the survey can refer.  Such surveys are generally within subdivisions known as “protracted subdivisions”. 

Survey regulations require that you consult with any surveyors who have set a marker at a corner if there is disagreement with its position.   At such a conference, it is anticipated that the result of such a conference will be an agreement thus avoiding the presence of an opposing marker.   Surveyors who come across multiple markers apparently intended to represent the same corner refer to them as “pincushion corners” for reasons that are obvious.

 

If you are in need of surveying expertise or dispute resolution regarding a surveying error, contact ParsCo at 850-696-7656 or email us at info@parscoconstruction.com. 

 

Visit us on the web at www.parscoconstruction.com