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Pipe Bulkwall Design

Pipe Bulkwall Design

Pipe Bulkwall Design

(OP)
I am designing a bulkwall for a 42'' hdpe pipe. The pipe is to be abandoned in place via grout fill, hence the need for a bulkwall. Anyone know of any sizing equations and/or standards that I should be aware of? I have been looking at bulkwall design standards from the US Bureau of Mines Information, but this is likely not the best reference for information in my case. Appreciate the help.

RE: Pipe Bulkwall Design

Just build a wall of concrete blocks and fill SLOWLY. Monitor the bulkhead as the pipe fills. what kind of grout are you using?

RE: Pipe Bulkwall Design

(OP)
My concern is the masonry not adhering to the HDPE surface. The fill is required to meet 300psi (Union Pacific requirement) so it will likely be a clsm mix with a water reducer. The longest flow section is about 500'.

RE: Pipe Bulkwall Design

Attach a curved steel angle all around the HDPE. Shotcrete the angle to the block. Maybe add a few #4 rebar before the shotcrete.

RE: Pipe Bulkwall Design

you will need a very flowable grout to completely fill 500 feet. Using internal grout tubes (I believe they were 2 inch), we had difficulty pumping clsm 150 feet. Mainly because it was too stiff. and superplasticizer doesn't help that much. You might consider a cellular concrete grout instead. NRCS has a good spec for it. assuming you have vent holes, you should be able to keep pressure against the plugs low (assuming your pipe is relatively flat)

RE: Pipe Bulkwall Design

(OP)
I considered cellular clsm. I am stuck with Union Pacific's requirement of 300psi though (pipeline is in a UP ROW). I don't think 300psi is achievable with cellular.

RE: Pipe Bulkwall Design

I'm curious here. What is clsm??. Is this a tunnel that is being sealed and abandoned?? If so I have extensive experience. We used 8x8 timbers with 6X6 bracing and 2x 6/8 for the formwork.On one job we pumped 800 feet with minimal difficulty

RE: Pipe Bulkwall Design

(OP)
controlled low strength material, or "flowable fill". Yes it is for the abandonment of a 42'' hdpe sewer line.

RE: Pipe Bulkwall Design

I have test reports from a project where the cellular concrete reached 1,700 psi at 28 days. so 300 psi should be a piece of cake

RE: Pipe Bulkwall Design

(OP)
amlinerrichard can you provide more detail about the shotcrete method you mentioned?

RE: Pipe Bulkwall Design

shotcrete is a sprayed on concrete. Cement sand and pea rock. Call a couple contractors that do that work.

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