Category: Chemical Soil Stabilization
Dealing with Soil Subsidence can be Quick and Non Disruptive
Dealing with Soil Subsidence can be Quick and Non Disruptive
On November 18th, the Tampa Bay Times published a story entitled “Is one of Tampa Bay’s premier condo towers sinking?”. The article discusses how “very loose and very soft bay bottom soils” have caused movement of the foundation that has resulted in “significant subsidence concerns and structural design deficiencies.”
Soil Subsidence is a common problem in Florida. Florida’s sandy soils and geological conditions can cause the soils to collapse away from the surface often times leaving voids underneath foundations and surface structures. Under instances where there is overbearing weight, the support soils will become inadequate to support the structure.
First of all, it is always best to ensure that the soil compaction density is sufficient before building the…
Soil Stabilization under 100-Year-Old FDNY Firehouse
Fire stations are critical in serving the diverse needs of the community where they are located, as well as the fire department they report to. The New York City Fire Department (FDNY) protects more than 8,000,000 New York City residents living and working in a 320 square mile radius. The FDNY is the largest fire department in the United States.
The FDNY serves the five boroughs of New York City and includes 255 fire stations. Each fire station’s differences relate to the size of the firefighting apparatus housed within it and the facility’s location, which is largely driven by the need to minimize response time. The FDNY Engine Companies are tasked with securing a water supply and extinguishing the fire while the FDNY Ladder Companies conduct search and rescue, forcible entry, and ventilation at the scene of a fire.
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Zero Excavation Inflow & Infiltration Restoration At the Naval Air Station in Pensacola after a High Water Event
Ever since the U.S. purchased Florida from Spain in 1821, the site where the Naval Air Station (NAS) in Pensacola currently stands has provided a base for military operations. In 1826, construction began on the Pensacola Navy Yard and it eventually became one of the “best-equipped naval stations” in the U.S. During this period, the Navy Yard was used for docking and repairing the warships of that period. When the Navy saw the advantages of aviation in combat, Pensacola became an aviation training station in 1914 and the station was built on the side of the old Navy Yard. In 2014, NAS Whiting Field celebrated 71 years in operation and is considered to be the “backbone of the Navy’s flight program” and is still one of the most important Navy bases in the U.S.
Combating Microbial Corrosion in Tunnels
Microbial corrosion, or microbiologically-influenced corrosion (MIC), is “the gradual damage to metal caused by the metabolic activity of microorganisms.” This corrosive damage has caused billons of dollars of damage to our water systems, especially our storm water and sewer systems, although MIC can happen wherever metal and water meet. Finding a solution for repairing corrosive damage depends on where it is occurring, why it is occurring, and how disruptive or expensive a repair or replacement will be.
There are several different types of bacteria responsible for MIC in metals located in soils and water; all are classified as either aerobic (requires oxygen) or anaerobic (oxygen is toxic). Sulfate reducing bacteria (SRB) is anaerobic and is responsible for most of the corrosion caused to steel in sea water; whereas, iron and manganese oxidizing bacteria are aerobic and are most often responsible for the rapid corrosion and pitting at welds in stainless steel. Microbial corrosion can also occur in plastics,…
Sealing Annular Space in a Sliplined Pipeline
In the United States, billions upon billions of gallons of stormwater are transported through the local sewer systems every day. The pipes that the water travels through have different degrees of structural integrity. Some of the pipes are as small as 8 inches in diameter and some are as large as 120 inches. The storm sewers can be made out of brick, metal, concrete, clay and plastic. As communities grow and these sewer systems age, local governments are forced to incur costs far beyond the material and labor to rehabilitate or expand the pipelines. Government officials must also figure out how to alleviate traffic delays, as well as business interruptions and disruption to neighborhoods, which can add to the cost of repairing the stormwater system.
One of the oldest and most cost effective methods of rehabilitating an existing drainage pipe is called sliplining. With sliplining, a new, smaller “carrier pipe” is installed inside the old, larger “host pipe.” …
