"My advice is free and worth every penny!"
AP 130EDF-GT & AP Mach1
C14-XLT & AP 900GTO
Quote:Quote:Quote:Hey Dan,How did you bolt your pier plate to that stack of bricks? Pictures? Haven't gotten that far yet. I'm gonna try to make more progress this weekend but the plan is to stuff some newspaper in the voids of the blocks then pour concrete in just the upper block then set anchor bolts for the pier plates that the mount will bolt to. We'll see how it goes! Why not stuff the voids with broken pieces of blocks or clean stones?
Quote:Quote:Hey Dan,How did you bolt your pier plate to that stack of bricks? Pictures? Haven't gotten that far yet. I'm gonna try to make more progress this weekend but the plan is to stuff some newspaper in the voids of the blocks then pour concrete in just the upper block then set anchor bolts for the pier plates that the mount will bolt to. We'll see how it goes!
Quote:Hey Dan,How did you bolt your pier plate to that stack of bricks? Pictures?
Brad C8SE XLT, TMB 80SS, Orion ST-80 Atlas EQ-G/EQMOD 40D (Self-Mod), WO 0.8 Flat II, SSAG
Quote:If it were me, I would use a metal pier ( I like ATS piers) as you can easily adjust ( level) if the the foundation shifts or settles.But a properly sized concrete pier will work fine ( Dan,s piers offer good kits for concrete piers).Rex
Terry Danks Photography: Birds, Scenery, a little astrophotography too. http://danks.netfirms.com/home.htm Equipment List: Too embarrassed to list it all. Roll-off-roof Observatory Constructed Fall, 2013
Dark Arts Observatory - Brockport, NY - Skyshed POD XL5 with iOptron iEQ45 Mount
Scopes: C8, C5, SV110 ED, EON-72 ED, ST 80, ATRC6, Megrez 90
Quote:Good plan! I think that should work well for you. Don't forget the rebar in the concrete. 2 pieces should be plenty, but many people use 3.-Dan
Meade LX200 10" f/6.3 Classic
Celestron Nexstar 8SE
Celestron 90mm Mak
Meade 90mm f/8.8 Refractor
Celestron CR-150-HD6 ,6" f/8 Refractor
TASCO 60MM X 900 MM Refractor (My first scope that my wife gave to me for Christmas in '91 , still have it.
Celestron CG5 Advanced Mount
Celestron Bino Viewer
Orange Zone 10'X12' Roll Off Roof Observatory Southeast, South Dakota
Quote:... I guess a couple lengths of rebar will be necessary. Not happy about it but . . .
Quote:If you do not use rebar,it will not be long before the pier breaks apart.....
Quote:Chris,Looking at your latest sketch reminded me of the look of a z-braced radio tower - how well do you think a short section of something like Rohn 25 would work as a pier top? Russ
CG5ASGT Astro-Tech AT6RC Zhumell 10 inch dob deluxe kit 10x12 observatory Echo Astronomy maker of Custom bahtinov masks and Duncan collimation masks.
Scopes - 10" Meade LX200, Coronado 90mm, Vixen ED103, Orion 80mm Guide Mount - AP1600GTO Std (Encoders.... someday) Cameras - Atik 320E, Atik 314L+, Atik Titan, Mallincam Xtreme X2, Skyris 274M, Orion StarShooter, Canon 7D Instruments - L200 Spectrometer (300,600,1200 gratings), SA100 Diffraction Filters - LRGB,OIII,SII,Ha; J/C UV,B,V,Ic,Rc Way too many computers....
Quote:OMG!!!!!! When I think of all the concrete columns that I've poured without rebar it just makes me sick ... oh the humanity when they do shatter and collapse ... The tension forces on our astronomical columns are virtually non-existent for all practical purposes. There is no need for rebar from that quarter.
AT8RC with Moonlite & Stepper Motor
Skywatcher 120mm ED PRO
Skywatcher HEQ5 with EQMOD, KWIQ Guider
Nikon D5100 Baader mod by Brent Oliver
12" GSO Dob with Argo-Navis, 102mm Skywatcher Short Tube
Quote:Just out of curiosity, how many mount piers have you seen pulled apart by frost heaves?dan k.
Quote:Quote:Just out of curiosity, how many mount piers have you seen pulled apart by frost heaves?dan k. I'm a small-town contractor/carpenter, and I've seen quite a few that have pulled apart from frost action - mostly foundation piers under porches and decks. They normally seem to break about 6" below the ground surface, or near the bottom of a j-bolt or short piece of rebar put in to attach a post anchor to.On the other hand, an 8" pier with a single 1/2" re-bar in it can be cracked, but cannot be broken fully or pulled apart, even if slammed with the bucket of a backhoe in an attempt to break it into pieces for removal. With 2 re-bars, they're hard to even crack, and must be in both cases dug up whole.While they're not quite as rust-resistant or strong, I often use lengths of threaded rod for re-enforcement, because they serve both strength and anchor purposes at once.Russ
NW Mass, inches from Vermont
(well....it used to say that.....)
Quote:Just a reference regarding frost heaves and rebar in piers:http://www.structuretech1.com/2013/06/frost-heave-and-deck-footings/The whole thing is pretty short and can be read quickly. But to get to the pertinent information, scroll down to the bottom and read the two paragraphs between the image of the sonotube with the concrete bell-bottom, and the drawing of the pier with rebar in it.-Dan
Takahashi FS128, TSA 102, FSQ106N, Losmandy GM-8, Baader Mark V, Leica ASPH, Takahashi, Ethos and Panoptic eyepieces.
Quote: McMaster-Carr cancelled my order to Canada.
Quote:Never seize or a simular anti- seize compound is sold at all hardware and auto parts stores. its used for preventing bolts on car engines from seizing.Rex
Quote:Hi Chris:If by the "top of the pier" you mean the observatory, then no. I'm still waiting for the POD to ship. Did you mean something else? The pier has been done for quite a while now.-Dan