MANHOLES

Precast Concrete is the concrete construction method of choice for City Public Services where precast concrete construction is applicable. They have their own reasons for using Precast. Some of them are probably outlined below.

There are Several Great Reasons to Use Utility Precast Concrete Methodology

• Less time and effort spent in inspection of the process.
• Safer working conditions for work crews
• Less excavation is required because close tolerances work. You need no room to build a form
• Better verification processes to insure quality construction
• Less time spent overseeing the project
• Less traffic congestion and dislocation around the work-site
• Less risk due to weather problems as a result of a shorter construction period.
• Less time spent in the construction process and therefore less risk relating to an open and vulnerable construction site
• Fewer construction processes and fewer points of responsibility in the construction process
• More flexibility to deal with errors. We have lifted manhole sections out of the ground to allow for corrections in elevation by the excavation contractor. It might have taken a couple hours to correct the problem. Hmm, adjusting a pour-in-place form would have been….. start over from scratch.

2 large manholes were carefully constructed off-site. The excavation contractor came in one day and dug two large holes and the next day several large lowboys delivered the pre-cast concrete sections to the work site.

In one-half day both manholes were in place, and back-filled to the proper elevations.

Size and Scale in these pictures might be deceiving here.

The hole in the first picture was 12 feet deep. The outside edges of the holes were 14 feet X 14 feet. The pre-cast concrete manholes are not that much smaller than the actual sides of the holes . Someone figure out how many more cubic yards of excavation material are necessary to make the hole big enough to build a proper pour-in-place form. The lazy answer is much more bother, much more hauling, much more effort.

Next Question, How long would it have taken to do a similar project with pour-in-place methods?

If you would like to discuss how Pre-Cast might be a great option for a particular construction project, give us a call, or feel free to send us email or fill out our on-line form. We would be happy to discuss your thoughts and concerns with you.

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