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The tremie concrete placement method uses a vertical or nearly vertical pipe, through which concrete is placed by gravity feed below water level. [4]The lower end of the pipe is kept immersed in fresh concrete so that concrete rising from the bottom displaces the water above it, thus limiting washing out of the cement content of the fresh concrete at the exposed upper surface.
Riser Clamp holding plastic pipe, penetrating through a concrete floor slab. The copper pipe penetration is firestopped with firestop mortar. Riser clamp for a standpipe through-penetration firestop inside a fire hose cabinet under construction
These occur when pipes begin to leak from within the slab. Signs of a slab leak range from unexplained dampened carpet spots, to drops in water pressure and wet discoloration on exterior foundation walls. [5] Copper pipes must be lagged (that is, insulated) or run through a conduit or plumbed into the building above the
The monolithic pour creates concrete beams running throughout the footprint and perimeter of the foundation, with voids between, in one operation. The completed slab then sits on the ground bearing on the ribs created between the forms. The void areas underneath the slab allow for soil movement. The waffle slab foundation is very stiff, with ...
Another common type of shallow foundation is the slab-on-grade foundation where the weight of the structure is transferred to the soil through a concrete slab placed at the surface. Slab-on-grade foundations can be reinforced mat slabs, which range from 25 cm to several meters thick, depending on the size of the building, or post-tensioned ...
For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus. In case of insulated piping, the size of the insulation must be taken into account for the intended firestop certification listing .
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