|Subject:||[TowerTalk] Tower Trailer Safety;maintainence|
|From:||"Pat Barthelow" <firstname.lastname@example.org>|
|Date:||Fri, 14 Jan 2005 11:04:21 -0800|
I am refurbishing a State Highway Department (Caltrans) floodlight support trailer for re use as a ham radio tower trailer. The trailer has a HD Tristao 60 ft tower, with two motorized pivot (to vertical) and telescoping (3 20 ft sections) cable drives. The trailer is weathered, but inspection shows only localized surface rust of parts of the frame and erection fixtures. I want to clean up and paint, possibly repair gavlanized surfaces, and replace lifting cables. There will be a generator mounted aboard, and cabinets for equipment storage. The tower is in excellent shape and has a HAM 4 rotator. The trailer has two pivoting outriggers that are simple pipes, angled to the ground with footing plates, and a turnbuclke cable to bring the outrigger foot to bear pressure on the ground. Pictures exist for anyone interested in discussing improvements, safety issues. I see no locking features for each section, when extended. How can this be made safe? Is it safe to climb to each joint, and insert a block?
I am reading case histories of crane and tower accidents on the web, and have found a number of crane accidents (often fatal) that were caused by crane outriggers failing for a variety of reasons, often by putting more than allowable PSI on the ground, resulting in earth shifting, unbalancing the crane, and causing collapse. Or outriggers that were not of sufficient radius to ensure stability. Not wanting to experience this firsthand with the tower trailer, I want to learn more about outriggers, scrutinizing the adequacy of the two existing ones at the rear of the trailer.. The trailer is only a single axle, is about 18 ft front to rear, approx 7 ft wide, and the tower is very close to the rear, when vertical, with the two outriggers, about 15 ft long, pivoted and producing a triangular footing comprising the outriggers, the road wheels, and the trailer tongue screw jack.
Hopefully the ascii char drawing comes out OK below...
I am looking for feedback wrt safety issues, and surface rust refurbishment techniques..
Email me for pics if interested...
Tnx...de Pat AA6EG email@example.com
/ 0 \ Pintle ring for tow
/X y \ Vertical Screw Jack at X to ground footing
/ y \
/ y \
/--------------------\ Cross member supporting horiz tower@ abt 6 ft fm gnd.
| y | Y=Tristao 3 section 60 ft heavy duty tower
| y | with motorized erection fixtures
| y | Tower supported about 6ft high on trailer frame.
| y |
| y |
() | y | ()
() | y | () Road Wheels
() | y | ()
| y |
| ------- | Pivot axle for putting tower vertical @ about 5.5 ft fm gnd
| y |
| / \ |
0-------/ \------0 Cradle for base of tower to be pinned vertical, abt 8" above gnd
X X Outriggers, Pivoting pipes from about 6' elevaiton
X X Footing pressure through turnbucke-cable
[ X ] foot pad [ X ] foot pad
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
_______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
|<Prev in Thread]||Current Thread||[Next in Thread>|
|Previous by Date:||Re: [TowerTalk] Tower Conundrum, Gene Smar|
|Next by Date:||Re: [TowerTalk] Moth Balls, K8RI on Tower Talk|
|Previous by Thread:||[TowerTalk] apologies to SM2EKM, RICHARD BOYD|
|Next by Thread:||Re: [TowerTalk] Tower Trailer Safety;maintainence, Jim Lux|
|Indexes:||[Date] [Thread] [Top] [All Lists]|