Divers removed large sections of a old Adit using a drop hammer, core drill, rock splitter, and diamond wire cutting. Some pieces took a pull of 120 ton to remove from bottom.
Using the crane, personnel would rotate wall sections to the vertical position to be placed by the divers.
Precast Concrete Foundation
Precast floor sections were lowered to bottom on cast in place footings established by the divers. Some sections of the floor had slots for Pin Piles that would be driven , rebar cages installed, divers would tie in pile cages to pile cap rebar, form up for Pile Caps , then pour the pile caps.
Precast Concrete Foundations
The sections would be tied together using rebar, and concrete.
Concrete Pouring underwater
To pour all the concrete in the pin piles, pile caps, sub floor below the precast foundation, and backfill any voids around the excavated area and new intake structures. This was all done with a concrete boom truck from the beach reaching out to the dive barge.
Diamond Wire Saw
Demolition of the old Adit sections and water box was performed by divers jetting working spaces under the pipe. The then fed Diamond Wire from the surface, under the sections, and back up to the barge. Sections were then cut to be taken to the disposal area.
Diamond Wire Saws are common tools we use for removal of large structures. It is also used when a cut may be to dangerous for a diver to do with conventional hand tools. Diamond wire saws can also be used to cut structures made of steel or other building materials.
Concrete Demolition and pile driving
To drive the pin piles, we fabricated a shoe and socket that fit this drop weight and would fit inside our pin piles. Divers would stab the shoe into the pin piles and control the pile driving operations via communications with the crane. This drop weight was also used to demolish old floor sections, concrete water boxes, and intake structures so they could be removed.
For demolition of the natural granite bottom, divers used a Hoe Ram to break up large areas. Divers also used this to dig a keyway for the new rip rap.
To remove sections of granite, or large concrete, divers would drill holes using a rock drill and fracture the rock with a rock splitter. This allowed the divers to manage the debris with ease, and remove them from bottom.
We use many methods to build our forms. EFCO forms, wood forms, and steel forms are commonly used so we can achieve our desired pour.
Divers using Rock drills
We use a lot of common worksite tools topside as well as underwater. Divers will use rock drills, and rock splitters to make large pieces more manageable.