The Construction Of The Segmental Retaining Wall In Manchester, NH
The Objective - With the continual growth in Manchester, New Hampshire area which is near the greater Boston area, the Manchester Boston Regional Airport took on the expansion that included facility upgrades. The upgrades also included a runway expansion.
Segmental Retaining Wall - TenCate is a manufacturer that develops and generates materials for greater performance, and a reduction in cost, while delivering exceptional results by working with their customers to offer the best products.
The Design - Held back by the current airport entrance roadway, it was decided to create a segmental retaining wall using Keystone Compac and Miragrid® XT geogrids to increase the length of the available runway. A unanimous agreement declared the wall must be structurally sound and aesthetically appealing.
Uniaxial Geogrid Install in Manchester, NH
Finished Large Retaining Wall
The Construction - During the construction phase of the project, it was determined the retaining wall had to be 28 feet high. A section of one wall had 2 14-feet tiered retaining walls that blended into a third wall. All three of these walls merged at the end of the span to form a structure with approximately 100,000 square feet of frontage.
Performance - The Keystone Compac walls implementing Miragrid® XT geogridsprovided a structural portion of the retaining wall (SRW) that blended with the existing walls. The combination offered an excellent alternative to conventional poured-on concrete walls.
Geogrid Reinforcement for MSE Wall In San Antonio, TX
The Objective - San Antonio, Texas has been called home to Tesoro Corporation since 1968. Since then, the current facility has become too small for their operations so Tesoro decided to relocate their headquarters to the intersection of U.S. Highway 281 and Redland Road, just north of Loop 1604 at Ridgewood Park.
Geogrid Reinforcement For MSE Wall - TenCateTM is a manufacturer that develops and produces materials for greater performance, a reduction in cost, while delivering exceptional results by working with their customers to offer excellent solutions. The new property is owned by Patrinely Group, LLC and constructed on 122 acres along with a 618,000 sq. ft leasing office. San Antonio's landscape consists of rolling hills and steep cliffs with exposed limestone. The location for the headquarters, Ridgewood Park, offers the same post-card appeal.
The Objective - Approximately 300,000 cubic yards of mass grading was necessary for the building's location and two engineered bridges were required for access to the site. The developer needed access to the site from the south off of Sonterra Boulevard. The problem, the access road would be a 75-foot elevation difference from the top of the street down to the existing grades on the property. Also, there is a limited amount of space in that area so constructing a steepened slope would be out of the question and the retaining wall was necessary on the east side of the access road. More explicitly, a Keystone-engineered wall system using Miragrid® geogrid was the most economical and architecturally attractive alternative.
Roll of Geogrid at San Antonio Job
The Design - The engineers working on the project brought in the owner to decide which MSE wall should be used to meet their goals for an aesthetically appealing structure that would be able to handle the loading conditions of the access road. Finally, the Keystone wall system was chosen not just for its aesthetic appeal, but the wall's height-to-depth ratio delivered the engineers' structurally sound wall system with outstanding stability, durability, and strength.
Geogrids are a critical reinforcing component in the Keystone wall system. Miragrid® 3XT, 5XT, and 8XT geogrids were designed into the system due to their high long-term and creep-reduced design strengths along with the compatibility of the connection features of the Miragrid® products to the Keystone wall blocks.
Miragrid® geogrids used in the Keystone wall system provided an adorned wall design by creating a considerable amount of soil behind the wall. Using Miragrid® products in the wall system, created the needed internal stability causing less pressure from the soil on the back of the soil blocks which in turn decreased bulging and other stability issues.
San Antonio Project Using Geogrid
Construction - The landscape of the site came with several challenges for constructing the wall system and the access road. Due to extreme changes to the elevation, the Keystone-engineered wall system was designed and created into a three-tiered system with the tallest part rising to 43 feet.
Constructing the foundation of the wall system required compacting a TXDOT aggregate to a level grade.
The contractor installed Miragrid® 3XT, 5XT, and 8XT at the calculated elevations in order to reinforce the soil structure. Due to Miragrid® XT geogrids’ excellent flexibility, the contractor could maneuver and connect the geogrid between the individual Keystone blocks making it easier than using a stiffer reinforcement geogrid.
Performance - The final outcome of the project was a total success. The contractor was able to complete the Keystone wall system on time. The entire system reached the developer's goal of an aesthetically appealing system which offered a solution to constructing a critical access road into the property. All those involved with the design, construction, and the end results of the wall were totally satisfied.
SRW Wall Reinforcement, Roanoke, VA
The Objective - The owner of a shopping mall in Roanoke, VA needed a parking area for the new Home Depot®, Chick-fil-A®, and other businesses while keeping the existing road that services the area above the site. There were several significant grade problems that would require special construction procedures to keep construction down in the cut areas behind the wall.
The Design - To keep down excavation, the crew decided to use a soil nail design in the most prominent cut areas. The design included soil nails drilled into the slope and the geogrid attached to the header beam. In the balance of the site where they had fills or minimum excavation, standard SRW geogrid designing was used. The wall behind the Home Depot®is a Century Wall by Keystone offering multi-colors while the wall at Chick-fil-A® is the Compac 2 design.
Roanoke Job Using Geogrid
Construction - A drill attachment on a small track hoe was used to drill holes into the existing grade. Mechanical soil nails were inserted into the holes. A header pipe was connected to the set of nails and the correct strength of Miragrid® geogrid was wrapped around the pipe and attached to the wall face. After the soil's nail section of the wall was finished, the balance of the SRW walls on both sides of the roadway, in the fill area, were brought up simultaneously.
Large Retaining Wall Completion
Performance - The design allowed the developer to maximize the usable footprint on the site while maintaining traffic on the existing location. The developer was able to change the style of the block and offer different textures throughout the project.