Recently there are many people coming by bicycle to our company.
I would like to solve the problem about where they should park their bikes.
Do you have any suggestion about what type of bike racks are suitable for us?
As someone who rides their bike everywhere I have experienced a great many types of bike rack. In my opinion the best choice is a Sheffield Stand.
Image Copyright David Wright CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0), via Wikimedia Commons
They are cheap, simple and readily available to purchase. When installing them make sure they are far enough apart so that riders have enough room to comfortably part and lock their bike.
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As others have said, avoid anything that holds the wheels. These provide poor locking options and don't easily accommodate bikes with different sizes of tyre. They can also damage rims and spokes.
My personal preference for racks is a bunch of U racks, a 'coathanger' style rack, or a wave rack in that order. I'm looking for a rack that I can ulock the frame to and secure both wheels with a cable and hold multiple bikes in close proximity.
When Installing parking racks, be sure not to put them too close to the wall so that it eliminates 1/2 of the rack's capacity. I see this a lot with coat hanger style racks, which can be loaded from 2 sides, but are often butted against a wall, so they have 1/2 the possible capacity.
Whatever you do, don't ever get toaster racks like these. There is no good way to use a ulock on them. They wind up forcing users to park bikes in awkward ways to lock securely.
Photo by Steve Vance
If your company has the space, I recommend allocating indoor space with a double decker style of rack to maximize space.
My company took a 20ft x 75ft space and installed a two level rack, lockers, a bathroom with shower and bike work stand. It gets filled up everyday with commuters, no locks needed (the door from the outside needs their office key card), out of the elements and tools to fix any issues.
I think you're approaching this the wrong way. Come up with a design on paper that fits your requirements, then find a local fabrication company to weld up what you want.
Features you could consider
Once your design is finished, contact a metalworking company to price it. They may make suggestions.
I've secured my bike to "toaster racks" shown above. The significant issue with the one above is that it is too close to the road for a biker to use it properly without their tire being in the road.
Also, Arlington VA has a nice website on the subject. It also discusses spacing, etc. http://www.commuterpage.com/pages/special-programs/tdm-for-site-plans/bicycle-parking-standards/#mistakes
(update) You can checkout some design under wikipedia bicycle parking rack page.
the easiest way is google "buy bicycle parking rack".
Depends on region, there may not be "ready made" for mass bicycle parking near your local bicycle shop. You need to find workshop that fabricate those rack/stand/pole/etc.