Roadway embankment over a pipe line
Roadway embankment over a pipe line
(OP)
Hi All,
I am seeking for tips from experienced engineer who has expriences with installing some type of pile foudnation box culvert to protect utililty line from settlement.
Here is my situation.
I am working on a roadway project, building an overpass bride over existing railroad near a train station. There are many railroad lines underneath the proposed structure. In addition to that a 72" sanitary sewer line is arcoss underneath(about 8-10 feet from ground surface)those railroads and proposed embankment. This sewer line has to be in service for 24 hours/365 days. The height of proposed embankement is about 30 feet.
The subsurface condition of this area is very poor (About 10 feet of very-soft clayey silt or silty clay underlain by another 20 feet of very-loose to loose sand). These materials are interbeded down to depth of almost 100 feet. Bedrock is located about 150 feet from groundsurface.
According to my settlement calculation, about 1.5 feet of settment is anticipated. Obiously, this sewerline will be affected by this settlement. A box culvert type of structure with pile foundation is one of my concerns as a solution.
Is there any other way to protect this sewer line?
Many thanks in advance,
Yong
I am seeking for tips from experienced engineer who has expriences with installing some type of pile foudnation box culvert to protect utililty line from settlement.
Here is my situation.
I am working on a roadway project, building an overpass bride over existing railroad near a train station. There are many railroad lines underneath the proposed structure. In addition to that a 72" sanitary sewer line is arcoss underneath(about 8-10 feet from ground surface)those railroads and proposed embankment. This sewer line has to be in service for 24 hours/365 days. The height of proposed embankement is about 30 feet.
The subsurface condition of this area is very poor (About 10 feet of very-soft clayey silt or silty clay underlain by another 20 feet of very-loose to loose sand). These materials are interbeded down to depth of almost 100 feet. Bedrock is located about 150 feet from groundsurface.
According to my settlement calculation, about 1.5 feet of settment is anticipated. Obiously, this sewerline will be affected by this settlement. A box culvert type of structure with pile foundation is one of my concerns as a solution.
Is there any other way to protect this sewer line?
Many thanks in advance,
Yong





RE: Roadway embankment over a pipe line
I would be concerned about downdrag on the piles if you are anticipating that much settlement.
Is it possible to go over the top of the embankment and roadway with some type of syphon?
Glen
RE: Roadway embankment over a pipe line
The use of polystyrene will essentially eliminate the dead embankent loads and the subgrade settlement.
Check out this link: www.mottmac.com/html/03/project.cfm?projectid=45&project=technology#
Good luck.
RE: Roadway embankment over a pipe line
Geofoam blocks are used and are light - about 50m of blocks is same weight as 1m of soil. They use these for rail bridge abutments (Norway) and Utah has used them on the I-15.
RE: Roadway embankment over a pipe line
RE: Roadway embankment over a pipe line