Construction Hoists

Page 1

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Construction Hoists
Image 1
This was the construction hoist used during the building of the new
Tacoma Narrows bridge in Tacoma, Washington, U.S.A. (1 of 7)
Image provided by: David McLellan - Thanks for the great pictures David!
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Construction Hoists
Image 2   Click to view a larger and higher resolution image
The hoist ran up to 506 feet above the water level (2 of 7)
Image provided by: David McLellan
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Construction Hoists
Image 3   Click to view a larger and higher resolution image
David McLellan (3 of 7)
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Construction Hoists
Image 4   Click to view a larger and higher resolution image
The old and new (4 of 7)
Image provided by: David McLellan
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Construction Hoists
Image 5   Click to view a larger and higher resolution image
Each tower will have an elevator (5 of 7)
Image provided by: David McLellan
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Construction Hoists
Image 6   Click to view a larger and higher resolution image
Image provided by: David McLellan (6 of 7)
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Construction Hoists
Image 7   Click to view a larger and higher resolution image
Image provided by: David McLellan (7 of 7)
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Construction Hoists
Image 8   Click to view a larger and higher resolution image
Removed from service in the Gulf of Mexico due to excessive corrosion (1 of 2)
Image provided by: Mark Fehrle
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Construction Hoists
Image 9   Click to view a larger and higher resolution image
Quite a "rats nest" here...(2 of 2)
Image provided by: Mark Fehrle
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Construction Hoists
Image 10
Tokyo Geo-Site Project - Tokyo, Japan (1 of 2)
This might be classified as a Special Purpose Personnel Elevator in some jurisdictions.
Image provided by: Sami Sands
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Construction Hoists
Image 11
Tokyo Geo-Site Project - Tokyo, Japan (2 of 2)
Image provided by: Sami Sands
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Construction Hoists
Image 12
Image provided by: Pete Gregor
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Construction Hoists
Image 13
A different type of landing...I'm not sure why it is raised so high above the floor slab
Image provided by: Bill Bennett
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Construction Hoists
Image 14
This hoist appears to have 3 drive units and no counterweight
Image provided by: Peter Gregor
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Construction Hoists
Image 15   Click to view a larger and higher resolution image
New York City, New York, U.S.A.
Image provided by: Rick Swann
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Construction Hoists
Image 16   Click to view a larger and higher resolution image
Please note - the glazer is working with a proper safety harness...you can see why!(1 of 2)
Image provided by: Pete Gregor
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Construction Hoists
Image 17   Click to view a larger and higher resolution image
Image provided by: Pete Gregor (2 of 2)
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Construction Hoists
Image 18
A slightly different sort of hoist in China
Image provided by: Sami Sands
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Construction Hoists
Image 19   Click to view a larger and higher resolution image
A nice job of coordinating the hoist and building colors in San Francisco, California, U.S.A.
Image provided by: Pete Gregor
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Construction Hoists
Image 20
Image provided by: Pete Gregor
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Construction Hoists
Image 21   Click to view a larger and higher resolution image
Is that a side door that is unlocked at the bottom landing?
Image provided by: Phil Narson
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Construction Hoists
Image 22   Click to view a larger and higher resolution image
Shenzhen, China (1 of 3)
Image provided by: Roi Lung
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Construction Hoists
Image 23   Click to view a larger and higher resolution image
Shenzhen, China (2 of 3)
Image provided by: Roi Lung
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Construction Hoists
Image 24   Click to view a larger and higher resolution image
Shenzhen, China (3 of 3)
Image provided by:
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Construction Hoists
Image 25
Authorities in California require that the "hoist structure shall be anchored to the
building or other structure at vertical intervals not exceeding 30 feet."
Image provided by: Ray Ramus
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Construction Hoists
Image 26   Click to view a larger and higher resolution image
This building looks awful narrow to require two hoists (1 of 2)
Image provided by: Myra Banks
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Construction Hoists
Image 27   Click to view a larger and higher resolution image
From this angle we can see why two hoists are in use (2 of 2)
Image provided by: Myra Banks
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Construction Hoists
Image 28
This is an interesting landing arrangement at Sagrada Familia Cathedral - Barcelona, Spain
Image provided by: Möv Ingwalk
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Construction Hoists
Image 29
The upper landing of a make shift "hoist" - Bangkok, Thailand (1 of 2)
Image provided by: Roi Lung
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Construction Hoists
Image 30
Preparing to jump the "hoist" one more floor or two. (2 of 2)
It's good to see they are wearing steel-toed "flip-flops"!
Bangkok, Thailand
Image provided by: Roi Lung
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 Rack & Pinion Safety 

 

This is the only construction hoist safety device I am familiar with...I suspect there are other types. If you run across any other information let me know and I will include it here.

The following images and description of the belleville washer are from Wikipedia

Belleville Washer     Belleville Washer     Belleville Washer

"A Belleville washer, also known as a cupped spring washer, is a type of non-flat washer. It has a slight conical shape which gives the washer a spring characteristic. Belleville washers are typically used as springs, or to apply a pre-load or flexible quality to a bolted joint."

The following images of the rack and pinion safety device are from AlimakHek.
I am responsible for the notations on the images and the description of operation which follows.

Rack & Pinion Safety Device     Rack & Pinion Safety Device

As you can see in Figure 1 when the safety device is in the released position the only parts driven by the rack, which is attached to the mast (tower), are the pinion, pinion shaft, and centrifugal device. The brake drum is not rotating and the belleville washers are not compressed any more than the factory set preload.

If the car should overspeed the centrifugal device will begin to move outward and eventually come into contact with the brake drum - Figure 2. The brake drum will begin to rotate. The threaded shaft attached to the brake drum will turn, compressing the belleville washers and also opening the safety operated switch that is operated by the plunger (the safety switch is not shown). As the belleville washers are compressed the brake drum is brought tighter into the cone that is built into the stationary case and tighter against the friction material. The pinion gear is being driven by the motion of the hoist traveling down the rack. Any resistance encountered by the pinion will be seen as a retarding force to the overspeeding hoist. You can see that the stop will be gradual, firm, and quite positive. I have never seen a rack and pinion safety device not work as intended - I realize anything can fail but this seems to be a well thought-out and reliable device.

The safety device is reset by running the car in the up direction. The safety operated switch is reset automatically when the safety device is in the released position.

Most authorities having jurisdiction have a mandatory replacement interval for these safeties and the interval is generally no more than 5 years. Also, the safety device should be tested with a full load whenever the construction hoist is moved to a new location.

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Construction Hoists - Page 2

 

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