I just made my first steel duck pit this year. I searched the web not finding much but a few pics of pits for sales etc. I thought that I would post on how I built my pit. It may not be right or wrong but it works for us.
To start with I bought steel from the local steel yard, I had them do some of the cutting and welding to same me time and hassle.
I started with the following material: to make a 4’x4’x18’ pit (6man 2 dog box)
3- 4’x18’ 12ga steel (4x8 welded to 4x10 from vendor) for bottom and sides
2- trapezoid 45”w bottom 32”w top 48” tall for end caps(cut by vendor)
1- 4’x10’pc cut into 15”x10’ strips for base flanges(cut by vendors)
2-2’x4’ pc for dog boxes
10- 1½”x1 ½”x1/8” angle iron (I would recommend 2” though)
My steps were as follows;
Weld a pc of angle length ways along side pc 18” from the top, and add a small lift point centered.
Weld the 2 end caps inset 1.5” from edges of bottom pc(for t-weld instead of butt) put on anchor point(angle)
Hoist the sides up and tack weld to the bottom and ends. Sides should be inset 1.5”, and overlap ends 1.5”
Then i put bracing in for the dog box, 2x12 bench seat, and ceter bracing. I put the dog box 18" down from the top. My seat height was around 16". i put bracing in the center to stiffen. I mounted the seat supports so that the 2x12 can slide back and forth. I put angle around the top.
After bracing i made solid welds all around pit to seal. Put the dox box sheet on. Then put the 15" strips along the bottom for anchoring. with angle bracing as shown
I chose garage door panels for the top, so that they could slide either way depending on the wind.
When installing we put mobile home anchors on each end with cable(would recommnend 2 in the middle also). The floor has a slight bow after pressure I should have ran angle cross ways under the floor. It had enough down anchoring to hold in the ground. We flooded the field the same day we back filled.
This is just how we did it, hunts 6 and 2 dogs well. we have a 12volt bilge to pump out rain water. Just thought i would share, since i had a hard time trying to get an idea of how to build one. I am no proffesional welder, but i did 95% of the welding with a 220 mig. It was not as hard as i thought it might be just took a little time.