Precast Products

DROP INLETS & CATCH BASINS

A catch basin is a type of drainage inlet designed to collect excess rain and stormwater runoff from roofs, sidewalks, parking lots, and paved streets.

Cemcast Pipe and Precast catch basins are precisely engineered and manufactured in a wide range of sizes to meet all state and local standards and are a fast, effective and economical way to save time and money on your next project.

We make round and square storm sewer drop inlets, catch basins, and junction boxes. Both round and square structures can be made with A-LOK gaskets, eliminating concrete collars. We can also make these structures with rough openings when it is preferable for the contractor to provide the concrete collar.

CASE STUDY

Yankton Drop Inlet with Gaskets

When the South Dakota DOT needed storm sewer inlets for the Highway 50 project in Yankton, Cemcast Pipe and Precast proposed a precast solution to replace poured-in-place structures with a precast concrete system. SDDOT agreed to allow Cemcast to prove the benefits of gasketed precast inlets as a “test” project. The Cemcast solution saved several weeks on the schedule, reduced labor in the field, and eliminated the concrete collar that many municipalities do not like.

The key to the project was our gasketed storm sewer inlets. One of the largest structures was a 7’ x 11’ (7’ deep and 11’ wide inside dimensions) drop Inlet with a precast inlet lid that weighed in at 32,000 pounds. The structure had 48” reinforced concrete pipe entering each sidewall of the structure. On Day 1, the contractor laid 48” RCP up to the 7’ x 11’ drop inlet location and then excavated for the structure. On Day 2, the contractor set the 8-cubic-yard structure and installed the remaining 48” RCP into the opposite end wall. The contractor also backfilled the box without having to pour a concrete collar. The gasketed pipe allowed the contractor to create a watertight connection, eliminating the need to pour a concrete collar and enabling the excavation to be backfilled the same day.

Most importantly, this one precast gasketed storm sewer inlet saved the general contractor at least a week of time. A poured in-place structure would have taken one day to pour the base, then a second day to pour the walls. That is followed by three to four days of curing time before backfilling. In addition, the contractor would have needed at least one additional day to pour-in-place the lid that is tied to the walls with rebar. Overall, there were 69 precast concrete structures on this project, which saved the general contractor about 40 days of construction time.

Interestingly, it snowed the day after the inlet was installed and backfilled. Had this job been poured in-place, an additional week would have been wasted waiting for the snow to melt and re-digging the hole.

Cemcast Pipe and Precast is the only company in the region that produces gasketed storm sewer structures. Round manholes are good when pipe entries are not 90 degrees. Rectangular structures are ideal for structures with 90-degree entries. Manholes are more versatile than rectangular structures, but they are often much bigger. Rectangular structures are less versatile, but they take up much less space. Cemcast recommends gasketed inlets on all projects because it ensures a high-quality, watertight product, and saves construction time so that roadways can open more quickly.