Ethan Clarke
Anchoring a plastic septic tank is a challenging but necessary task, especially in areas with high groundwater levels. The buoyancy force on the tank can cause it to float, leading to potential environmental and structural issues. To prevent this, various anchoring methods can be employed, such as using long screw anchors, hand-installed with metal straps, or opting for auger cast piles. Another innovative solution is to design the tank to sink, reducing the need for a lengthy anchoring system. Additionally, blocking the tank's sides and using hold-down straps or webbing with buckles can provide extra support. Some manufacturers, like Ronco, even offer customisation options, welding hold-down tabs onto the tank for easy installation.
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What You'll Learn
Using straps and webbing
When anchoring a plastic septic tank, one method is to use straps and webbing. This can be done in several ways, depending on the specific requirements and constraints of your project. Here is a step-by-step guide on how to use straps and webbing to anchor a plastic septic tank:
Firstly, source the appropriate materials. You will need straps or webbing made from a durable material such as polyester or stainless steel, as well as buckles or clamps to secure the straps. These components can often be found at local sporting goods stores or home improvement retailers like Lowes or Home Depot.
Next, determine the placement of the straps or webbing. It is important to block the tank from sideways movement and ensure it is securely blocked into position. This can be done by screwing cedar blocks or using concrete to block the tank and provide additional weight.
Now, install the straps or webbing. Position the straps securely around the tank, ensuring they are tight and provide even pressure. If using webbing, feed it through the buckles or clamps to create a secure hold. You can also use stainless steel foot loops or metal straps attached to the tank for additional security.
Finally, test the stability of your anchored septic tank. Ensure that it cannot slide or move sideways and that it can withstand the intended weight and pressure. You may need to adjust the straps or webbing for a snug fit. Regular maintenance and inspections are also important to ensure the straps or webbing remain secure and effective over time.
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Screw anchors with metal straps
If you're looking to anchor a plastic septic tank, one method you can use is screw anchors with metal straps. This method is especially useful if your tank is within a VE zone and subject to buoyant force.
To begin the installation process, you'll need to procure long screw anchors that can be hand-installed. These anchors will be attached to metal straps, which will then be secured to the tank. The number of anchors and straps required will depend on the size and weight of your septic tank, so be sure to consult with a professional to determine the exact specifications.
When installing the screw anchors, it's important to consider the scour elevation. The anchoring system should be designed to go beyond the scour depth, ensuring that the tank remains securely anchored. In some cases, it may be possible to design the tank to sink, allowing for the use of shorter anchors. However, this decision should be made in consultation with a structural engineer to ensure the safety and effectiveness of the anchoring system.
The metal straps used in this method should be securely tied to the vault of the septic tank. This will provide additional stability and help prevent the tank from floating, especially if the water table is high. It is crucial to follow local regulations and guidelines regarding the minimum separation required between the bottom of the drain field and the top of the high seasonal groundwater.
By following these instructions and working closely with professionals, you can effectively use screw anchors with metal straps to anchor your plastic septic tank, ensuring its stability and preventing any potential issues caused by buoyancy.
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Weld hold-down tabs
The hold-down tabs are welded onto the bottom of the tank, and you can then simply screw these tabs into the floor or stringers to secure the tank. This method eliminates the need to design and shop for a new fastening system, saving time and effort.
It is important to note that tanks are more likely to slide from side to side than bounce up and down, so adequate bracing is crucial. To further enhance the stability of the tank, you can consider using quarter-round or picture frame moulding. Epoxy this moulding to the hull or the surface on which the tank will sit. This will provide additional support and prevent the tank from sliding.
Additionally, when using hold-down tabs, it is recommended to block the tank from sideways movement by screwing strips of sturdy material, such as 3/4" thick Starboard, to the floor snugly against the tank. This two-pronged approach of welding hold-down tabs and blocking the sides will ensure that your plastic septic tank remains securely anchored.
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Auger cast piles
Here's a step-by-step guide on using auger cast piles for anchoring a plastic septic tank:
Step 1:
Rotate the hollow-stemmed continuous flight auger into the soil to the desired depth. The auger's rotation helps create a cylindrical cavity in the ground, which forms the foundation for the pile.
Step 2:
Once the auger reaches the designed depth, concrete or grout is pumped through the hollow stem. It is crucial to maintain the static head pressure during this process to ensure the concrete or grout fills the cavity effectively.
Step 3:
As the auger is slowly extracted, the concrete or grout fills the cavity, creating a continuous pile. Careful control of the grout pressure and volume is essential to ensure the pile is defect-free and of the highest quality.
Step 4:
Place a reinforcement cage through the freshly placed concrete to enhance the pile's strength and stability. Typically, a minimum six-meter-long rigid cage is used, but longer cages can be installed depending on the specific design requirements or specifications.
By following these steps and ensuring proper quality control, auger cast piles can provide a secure anchoring system for a plastic septic tank, even in areas subject to buoyant forces. This method helps prevent the tank from floating and ensures its stability, making it a reliable solution for septic tank installation.
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Blocking sideways movement
When it comes to anchoring a plastic septic tank, blocking sideways movement is crucial to prevent the tank from sliding, especially when full. Here are some methods to achieve this:
Firstly, consider the tank's positioning. If it is mounted parallel to a bulkhead or structure, the tank may be blocked from sliding by the bulkhead itself, as it won't have room to move sideways. In this case, additional bracing may not be necessary.
However, if the tank is not constrained by its surroundings, physical blocks can be installed to prevent sideways movement. For example, cedar blocks can be screwed into the decking snugly against each side of the tank. This method provides a snug fit that prevents the tank from sliding. Alternatively, strips of sturdy material, such as 3/4" thick Starboard, can be screwed to the floor tightly against the tank. This creates a barrier that blocks sideways movement.
Another approach is to utilise hold-down straps or webbing with buckles. These straps are designed to secure the tank in place and restrict its movement. When combined with blocking methods, straps can provide additional security. For instance, stainless steel footed loops and two-inch webbing with plastic snap buckles can be used together for a comprehensive anchoring system.
Additionally, customisation options are available from certain tank manufacturers, such as Ronco. They offer the possibility to weld hold-down tabs onto the tank during the ordering process. These tabs can then be screwed into the floor or stringers, providing a secure anchoring method that replicates the fastening system of previous tanks.
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Frequently asked questions
There are a few methods to anchor a plastic septic tank. You can use straps, blocks, or screws to secure the tank and prevent it from moving.
You can use webbing with buckles or stainless footed loops with plastic snap buckles or clam locks. Make sure the straps are strong enough to bear the weight of the tank when it's full.
Cedar blocks are a good option to block the sides of the tank and prevent it from sliding.
Yes, you can use strips of sturdy material like Starboard, screwed tightly against the tank and to the floor. You can also request hold-down tabs from the manufacturer, which can be welded onto the tank and screwed into the floor.
Another method is to use auger cast piles or "long screw anchors, hand-installed, with metal straps attached to the tank". It's important to consider the weight of the tank when full and ensure it is blocked securely to prevent sliding or floating.
