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Power Plant Elevator Shaft

09/10/2018 10:08 AM

Dear All

My company got recently involved in evaluation of structural design for elevator shaft in coal fired power plant, approx 100m tall, that shall be attached to the boiler support structure. First comment from the client was that the usual type of construction is "self supported" shaft that is not attached to the boiler structure, however the contractor replied that due to characteristics of elevator equipment (allowable displacement) the shaft has to be attached to the boiler structure. Otherwise, the footprint of the shaft has to be larger, which is very difficult to do, because of the space constraints.

My question is does anyone have any experience with the "attached" elevator shaft, or any opinion whatsoever on this?

Thanks in advance

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#1

Re: Power plant elevator shaft

09/10/2018 10:33 AM
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#2
In reply to #1

Re: Power plant elevator shaft

09/10/2018 11:02 AM
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#3

Re: Power Plant Elevator Shaft

09/10/2018 1:23 PM

https://www.tuf-bar.com/wp-content/uploads/2017/08/ASCE_JCC_La_Chanceliere_Parking.pdf like this one ?

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#4

Re: Power Plant Elevator Shaft

09/10/2018 2:12 PM

..."The engineering task for the construction of the supporting structure for a modern steam generator comprehends the design and the erection of an approximately 100 m high tower on which the steam generator is suspended, allowing free downward extension.

The classical Solution for this task is a steel structure which commonly is considered as a part of the boiler. Access facilities like fire protected stair cases and elevator shafts are located according to operational requirements and construction regulations. Normally these facilities are installed into free-standing reinforced concrete towers, which are incorporated in or situated beside the boiler house.

For this task, a new reinforced concrete design was developed, integrating the stair cases and elevator shafts into the supporting structure of the boiler. This new design uses all the advantages of modern reinforced concrete technique like slipforming and lifting technique and proved very competitive compared with conventional steel structures. Therefore, the owners' decision was in favor of this reinforced concrete design for their new thermal power plant at Dürnrohr/Austria (405 MW + 320 MW). Civil work for the first boiler supporting structure was finished 1982, construction work for the second unit is in progress according to time schedule 1983."...

Link to pdf....

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#7
In reply to #4

Re: Power Plant Elevator Shaft

09/11/2018 2:37 AM

Thanks SolarEagle, you're the man, exactly on the spot!

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#5

Re: Power Plant Elevator Shaft

09/10/2018 4:43 PM

Assumimg coal elevation is not to be achieved by any kind of conveyor-belt, or other mechanism, then simplistically, an elevator shaft is a machine that conveys a (variably weighted box) at (possibly irregularly varying velocities) vertically (variable distances) while imparting variable horizontal loadings to the four corners at each level, and variable vertical loadings at each level, especially to the foundation and to the highest vertical level, which may, or may not, be the topmost building level, connected to, but relatvely isolated from the surrounding structure, at each corner of each floor level, if it is to be a winch-type elevator that does not shake itself apart over time....

Thus, the (shaft-machine) should be a steel structure, with a more-than-adequate foundation, appropriately-sized isolation-dampening-linkages at both lateral directions at each corner, and at each floor-level, and (vertical-dampeners) at all floor levels, depending on whether or not if it's to be a standard winch-type elevator.

(Track-mounted-type) elevators may be a different matter.

(Hydraulic-type) elevators are definitely a different matter...

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#6
In reply to #5

Re: Power Plant Elevator Shaft

09/10/2018 11:37 PM

Your excessive usage of parentheses is incorrect.

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#10
In reply to #6

Re: Power Plant Elevator Shaft

09/11/2018 5:44 AM

That comment is much kinder than a punch up the bracket.

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#8
In reply to #5

Re: Power Plant Elevator Shaft

09/11/2018 2:40 AM

Thanx for answering.

The elevator in question is just maintenance elevator for personnel and tools, possibly some smaller equipment transport, coal supply is by inclined conveyor bridge.

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#11
In reply to #8

Re: Power Plant Elevator Shaft

09/11/2018 6:25 PM

Clarity at last!!!

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#9

Re: Power Plant Elevator Shaft

09/11/2018 3:30 AM

Yes. The Engineer/Surveyor for the company supplying burst/collapse indemnity insurance cover on the boiler will have an <...opinion whatsoever...> on this. All it takes to receive it is a simple telephone call.

Something that is <...attached to the boiler support structure...> will impinge on the structure of the boiler, and if it is different from the drawings, photographs and other records that the insurance company holds on this vessel, then it is quite entitled to walk away in the event of in incident. That leaves the individual(s) and organisation(s) that changed it from those records exposed to civil and criminal proceedings in the event of an incident.

So, make the call.

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