Doghouse Manhole
Doghouse Manhole
(OP)
What is a doghouse manhole?
When is it used?
How is it constructed?
When is it used?
How is it constructed?
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RE: Doghouse Manhole
Precast saves time.
1. A CIP or precast slab may be placed under the existing line.
2. A precast riser section with openings (that look like an entrance for a dog house) is placed over the existing pipe and set on the CIP or precast slab. The riser may cemeted to to the base with mortar or concrete may be placed in the manhole to a point below the springline. The active pipe may then be broken out to expose the channel.
4. The new pipe will usually add to the flow and not be used for discharge.
5. Or you could construct a new manhole using brick/block and then break open the existing pipe.
More flexibility when working with brick and block - requires more time than precast doghouses.
RE: Doghouse Manhole
When you are adding a manhole b/c of new upstream pipe (i.e., new and active pipe meet and there is a change in direction), what would be the procedure for construction?
I am not clear on how you construct without interrupting flow. You build doghouse and new upstream pipe. Then you break active pipe and have a hole that needs to be plugged while you have flow through the manhole from new upstream pipe.
How is this done?
RE: Doghouse Manhole
RE: Doghouse Manhole
I will construct upstream doghouse manhole with existing active line running through manhole to service upstream users. Then, I will lay new pipe down to downstream intersection and construct another doghouse mahhole. When I break active line to redirect flow through new pipe, the existing pipe entrance through the doghouse manhole will be open, allowing flow through existing pipe. How do you deal with this? Hope this makes sense.
RE: Doghouse Manhole
RE: Doghouse Manhole
I was hoping someone had another idea.
Thanks cvg
RE: Doghouse Manhole
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