Stand a piling up in the water, raise your jet pipe alongside it, and turn on the pump. The water rushing through the jet pipe will "blow out" a hole underneath the piling, and it should immediately begin to sink. By moving the jetting pipe around the bottom of the piling, you can guide the direction that the hole is created underneath it. By moving the jet from one side of the piling to the other, you can "steer" it down straight.
In good material, such as sand, you can jet down a piling in a few seconds, provided you have sufficient water pressure and velocity. The sand is seldom clean and can contain roots, mud etc.
Roots can cause piles to seat off their desired location. The pilings float so you may need to push them down to obtain better depth see tips below. Up to a 12'x 8" dia. Larger piles need a crane as they weigh lbs 20' x 8"dia. A crane can be built simply with a 24' pontoon boat, 2" steel water pipe, steel cable and a 12v car winch.
The design and manufacture would have to be checked for safety before using it. When using a crane you need one person jetting, one guiding the pile and digging and a crane operator. Try to work when the water is calm. However if the pile is out of line, it is easy to jet it out and put it in the correct position.
It is possible to install about 10 piles per day. Protective wet suit pants, boots and gloves should be used to prevent abrasion loss of skin especially when you have been in the water for some time. Plumb up the piling with two spirit levels and a bungee chord, and quickly make sure it is vertical before the soil settles back into the hole. Once the settling occurs, it will be difficult to change the orientation of the piling. It is where you may expect people to not only walk, but also run or jump on it.
And the best way to prevent this is through a strong and appropriate dock piling installation. It has to be done in such a way that it will be able to last through years of bad weather and marine degradation.
You make the right choice based on the water conditions, bottom conditions, and contours, the structure type, and intended use, and your budget.
Jetting involves using a high-pressure water pump to blow a deep hole in the bottom. The piling is then set into the hole and is supported by sand packs. Jetting is the preferred and cheapest dock piling installation method for sandy bottoms with small rocks or shells. While a ft deep hole is enough for sandy bottoms, boat lift pilings need a ft hole. Hammering involves forcing small and medium rocks to the side and breaking through a thin clay layer.
However, it will not break through large rocks because they are more rigid and stronger than wood pilings. This is the preferred piling installation method for mucky bottoms. However, it is impossible to first guarantee a specific depth because the depth is estimated only before installation.
Drilling is the best and most guaranteed piling option for extensive rocky conditions. The drilled pilings usually reach at least ft into the rock, and are much stronger than sand or rocky bottom pilings. Tips and Warnings. Related Articles. Article Summary. Method 1. Choose pilings made of pressure-treated wood.
In addition to remaining constantly waterlogged, your pilings will be subjected to tiny organisms that feed on wood, so you need something that will hold up over time. It's also the most cost-effective option. Typically, pilings should be 6—8 in 15—20 cm in diameter, but if your deck will weigh more than 10, lb 4, kg , choose 10—12 in 25—30 cm pilings. Rent a 2—3 in 5. Often, your local home improvement store will allow you to rent high-powered tools like a water jetter which may also be called a hydro jet for a short amount of time.
These high-powered water pumps typically run on gasoline, and they come with either a 2 in 5. Spray paint your pilings at 12 in 30 cm intervals to monitor their depth. By marking them with spray paint, it will be easier to make sure your pilings are all installed at the same depth.
Measure the beams according to the height of your pier or dock. Your pier should sit about 3—4 in 7. Measure from the bed beneath the water to the maximum water line, then add on the depth that you plan to bury the pilings to get their total height.
You can always trim them later if you need to. Stand the first piling in the water. Aim the tip of the water jetter at the bottom of the piling and turn on the pump. The water will blow out of the hose with enough force to push the sand and silt out from under the piling.
As this is happening, guide the piling further down into the earth until you reach the desired depth. If you need to, move the tip of the hose from side to side so the piling can go in evenly. Use the water jetter to push some of the dirt back into place after the piling is set. Method 2. Measure from the bed beneath the water to the highest level the water reaches in your area.
Depending on how soft the earth is below the water, add another 1—2 ft 0. Multiply this length by the number of beams you will need to get the total length of PVC. Purchase heavy-duty PVC with a diameter of 12—18 in 30—46 cm.
For standard 8 ft 2. Drive the PVC pipe 1—2 ft 0. Remove the water and mud from the pipe with a bucket and post-hole digger. The pipe should be clear down to the bottom. If the ground is very hard, you may need to rent a mini-excavator.
Mix quick-set concrete in buckets according to the package directions. Quick-set concrete, or Quikrete, can be mixed by hand. Pour the concrete mix into a bucket and dig a small hole in the mix, then add in water according to the package directions.
For a PVC pipe with a diameter of 12 in 30 cm and a post of 4 in 10 cm , estimate about 2 bags of Quikrete per 1 ft 0. Position them as far apart as possible for the greatest mooring stability. Select a dock mooring location that is free of obstructions with sufficient water depth for proper watercraft operation.
Anchor the dock in this general area. Begin by inserting the steel pole down through the mooring cube sleeve. Check that the pole is level. Install all remaining steel poles using this same method. Position the PVC casing next to the pole with one end firmly against the seafloor. Mark the height of the steel pole on the casing and custom cut the casing to match the pole.
Slide the PVC casing over the steel pole and position it 1 inch lower than the top of the steel. Secure the casing to the pipe by tapping in the nail provided. Complete the pole installation by covering the top of the pole with the PVC cap provided, completely covering the nail head. Install the remaining PVC casings in the same fashion. Note: For full instructions on how to install a boat lift with this method, watch the instructional video in its entirety.
At Jet Dock, no matter the size of your boat, we have a floating dock that offers easy dock installation, maintenance-free construction and superior boarding and access. Contact your Jet Dock representative for help selecting from our floating dock kits and dock mooring solutions. Still not convinced you can complete your floating dock or boat lift installation yourself? Ask about turnkey installation by a professional.
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