A trampoline at home can be a fun activity, but it can be dangerous as well. If you do not have a trampoline fence, the next best thing is a trampoline pit so that the trampoline is inserted into the ground, and the edge of the trampoline ends up at ground level. This helps protect your children and family.
Decide where you want to put the trampoline pit in your yard. Make sure it is a level area, with no immediate objects or surroundings close by that could become damaged or hurt anyone who jumps off the trampoline. Also, make sure it is a ground area that does not have a lot of rocks or pipes.
Measure the circumference of the trampoline with a tape measure. Add 4 inches onto these measurements to ensure that the trampoline will be inserted into the pit smoothly. Mark these measurements in the area you want to put the trampoline pit so you know where to dig. Mark each 3 feet with a lawn flag until you have created the outline of your trampoline. Next, measure the height of the trampoline so you know how deep you need to make the trampoline pit.
Put on gloves. Start to dig. Use the shovels, and volunteers if possible, to start digging into the ground. Start on the outer edges so you can first create the outlined circle of the trampoline pit. Make sure to pass the dirt onto the level ground so it does not keep falling into the trampoline pit you are digging. This will take a lot of time, especially if you do not have other people digging.
Continue to dig until you have created a pit that resembles the circumference of the trampoline and seems to be deep. Use the measuring tape to see how deep the pit is. If you need to create more depth, keep digging. Try to make the bottom of the pit as even as possible by using a metal rake or plough shovel to even out the ground while picking up and distributing more dirt.
Measure the circumference and depth of the trampoline pit one more time once you are finished digging, to ensure that all the sizing is correct.
Mix the cement. Once you are completely sure that the bottom of the pit is even, pour a layer of cement across it to provide a stable platform for the trampoline legs to set on so it will not sink. The cement layer can be between 1 to 2 inches thick. Evenly distribute the cement over the entire bottom of the pit, up to where the side of the pit meets the bottom. Let dry.
Use numerous people to lift the trampoline over to, and then into, the trampoline pit once the cement has dried and hardened. Slowly and carefully insert it into the pit, making sure all of the sides even up so there is an equal amount of space between the trampoline and the top edge of the pit.
Regions where there is a lot of rain may be difficult to maintain a trampoline pit because of rainwater and mud.
Be very careful with trampolines, especially with children. Do a tentative test run on the trampoline for the first time it is in the pit, to make sure the cement holds and the ground is sturdy.