Slide Rail System with System-80 Tiebacks Shores Multiple Fuel Tank Installation
Fuel tanks are vital to the daily operation of brick and mortar fuel providers across the country. These storage devices are generally installed below the ground and are connected to fuel pump stations above ground. Depending on various key factors, the total area of excavation for the installation of fuel tanks can vary. Some of the most common factors are subject to tank quantity, tank dimensions, traffic loads, and soil conditions. Projects with multiple tank installations are subject to have proper spacing between them, such as a recent project near the Denver area. The project required the installation of three fuel tanks in sequential order. The contractor tasked with the project had previously determined that spacing between tanks was critical. To achieve the required spacing, the contractor would have to employ the use of a shoring system that could support the walls of a linear excavation cut that measured 131-LF in length, 16-LF in width, and 18-LF in depth. Also, the shoring system needed to address the pressure loads exerted from a live road located near the excavation, account for the groundwater found in the area and provide sufficient clearance that allowed the construction crew to lower and anchor the fuel tanks to a precast concrete slab.
For this project, the contractor selected a site-specific slide rail system paired with rolling struts and a system 80 tieback. The assembly of the shoring structure starts by threading steel panels along the interior grooves of the slide rail posts at the top of the excavation and brought to depth ahead of the excavator’s cut. The slide rail system employed the use of seven rolling struts affixed to the corner rails. The system 80 tieback was placed at ground level on the outer perimeter of the slide rail secured by clamps. Once the entire shoring structure was secured, the contractor proceeded to remove five rolling struts while two remained evenly spread. The removal of the struts provided the proper clearance needed for the installation of the tanks. The two remaining struts provided additional support between the spacing of the tanks at the center of the shoring system. Site-specific engineered systems provide a high degree of customization that allows for certain protective devices to be modified for unique applications such as this one. When projects of this magnitude present several bearing concerns, it is best to consult with a shoring engineering expert.