This challenge takes a different nature when compared to the others. This, instead of building simple structures to learn basic engineering principles, we were presented with a problem with no set solution. This problem entailed designing a structure, potentially a ramp, which could enable handicap access to a garden which is edged by curbs. This design has the possibility of increasing accessability for not only the handicapped, but the general populace as well. In my group, I have Taryn, Eric, and TJ.
A - The garden needs to be accessible to all students. We need to design and create something that can lift at least 600 pounds up to a raised bed.
- The target population is people with mobility problems. Handicaps and the elderly would greatly benefit, as they have trouble with stairs and ledges.
B - Our mission is to make the garden easily accessible
- Nathan has a lot of experience with wood and metal. Taryn's dad is a contractor. I know a kid in a wheelchair that I can talk to. T.J is good with math and physics.
C - The basic purpose of the project is to make the garden accessible to all.
- People who can't use stairs and those who need a hard surface to traverse will benefit the most. The garden is built on a hill, making it difficult to access. It is also in high school, so the large
This project is unique because all of the possible points of entry are either on a public sidewalk or parking lot. This means that we will need to design it to not obstruct any paths.
5 starting questions:
1.What are the legal/recommended angles for ramps?
2.Legal codes for parking spaces
3.What can we legally do to curbs?
4.What is the minimum/maximum width?
5.What is the minimum weight we need to support?
1 & 4. Maximum slope for hand-propelled wheelchair ramps should be 1" of rise to every 12" of length (4.8 degree angle; 8.3% grade). Maximum slope for power chairs should be 1.5" rise to 12" length (7.1 degree angle; 12.5% grade). Minimum width should be 36" (inside rails) - (48" is ideal).
3. REMOVING PORTIONS OF SIDEWALK; ACCUMULATIONS. No person shall loosen or remove any plank, brick, block, or support from any sidewalk or crosswalk or any curbing or gutter. This Section shall not apply to persons making repairs on any such sidewalk, gutter, curb, or crosswalk, or any person temporarily removing the same on account of building operations. No owner or occupant of any lot or parcel of ground shall permit earth or other substances to accumulate on the sidewalk along such property. (Code 1979, 16-103)
STANDARDS FOR CURB CUTS (A) Two or more curb cuts shall not be permitted on lots where narrow dimension on the abutting public right-of-way is less than 100 feet. (B) The curb cuts on corner lots shall be at least 25 feet from the intersection of the curbs of the adjacent streets extended. (C) Curb cuts on an interior tract shall have at least 20 feet between the throat CODE OF THE CITY OF LAWRENCE, KANSAS 16-3 (straight portion) of the drive at the property line. (D) The City Commission may waive the provisions of this Section. (Res. No. 4668)
Diagram of area:
Additional features of ramps:
Landings: Ramps having slopes greater than one vertical to 15 horizontal shall have landings at the top and bottom and at least one intermediate landing shall be provided for each 5 feet of rise. Top landings and intermediate landings shall have a dimension measured in the direction of ramp run of not less than 5 feet. Landings at the bottom of ramps shall have a dimension in the direction of ramp run of not less than 6 feet.
Handrails: Ramps having slopes exceeding one vertical to 15 horizontal shall have handrails or stair rails as required for stairways, except that intermediate stair rails shall not be required.
Guardrails: Ramps more than 30 inches above the adjacent ground or floor shall be provided with guardrails as required in Section 3210 and handrails as required in (f) above. Such guardrails shall be continuous from top of the ramp to the bottom of the ramp.
Surface: The surface of ramps shall be roughened or shall be of nonslip materials. https://www.google.com/shopping/product/2043040485454659752?q=grip+tape&safe=strict&rlz=1C1NHXL_enUS728US728&biw=1366&bih=662&sa=X&ved=0ahUKEwizn4y_oaXWAhUIzGMKHa_oBPAQ8wII0gIwAg grip tape, 9in x 33in
http://dpw.lacounty.gov/general/faq/index.cfm?11902=11902&Action=getAnswers&FaqID=JSNNOz1TTTQgCg%3D%3D&Keywords=1 no permit required for Platforms, walks and driveways not more than 30 inches (762mm) above grade and not over any basement or story below
A nice guide for ramp materials: :http://home.howstuffworks.com/home-improvement/construction/projects/build-wheelchair-ramp2.htm
How to build a ramp: https://www.lowes.com/projects/build-and-remodel/build-a-wheelchair-ramp/project
Heres some nice tips on ramps
Decomposed Granite: rock that is derived from granite via its weathering to the point that the parent material readily fractures into smaller pieces of weaker rock.
Here some information about decomposed granite:
The basics: Decomposed granite, or DG, is a granitic rock that has weathered to the point of breaking into very small pieces and silt-like particles. It comes in a reddish-tan color that will fade to a lighter tan over time. Decomposed granite is ideal for pathways and rustic patios, and can also be used as a topdressing around arid plants. It's sold by the cubic yard.
Cost: DG is sold by the bag for around $3 if you simply need to add to or fill in a small area, or by the cubic yard for $35 to $50. One cubic yard (a 3-foot cube) will fill the back of a standard pickup truck.
Advantages: It's relatively inexpensive and readily available.
Disadvantages: It can track inside on the bottom of your shoes, so if you have hardwood floors, you might want to take your shoes off after walking on a DG pathway. It's also difficult to remove weeds when they get out of control.
Special considerations: It's best to apply it in thin layers, watering down and tamping each layer to create a very compact surface. You can also add a stabilizer (a water-activated binder) to the decomposed granite area, which protects the DG from the damaging effects of traffic and weather while still allowing it to be permeable.
Specifications: It needs to be 2-3 inches deep and have 4” deep header boards forming the edge of the pathway.
Maintenance: You may consider installing a contractor-grade landscape fabric underneath your decomposed granite area to discourage weeds from growing, but be aware that weed seeds can still blow in from above. Stay on top of weeding by hand pulling or by carefully using an organic herbicide. DG will break down into the soil after a number of years, so you may find it necessary to add to your patio or walkway to keep it looking fresh.
Crushed granite and decomposed granite cost about $3 to $5 per cubic yard, or an average of $1 to $3 per square foot. These prices include delivery and distribution which can save time if you plan to install it as a DIY project.
How to install dg:
The minimum, inside clear width of the opening between the opposing handrails must be at least 36 inches to accommodate a wheelchair. This means the ramp must be built at least 42-inches wide to allow for the 1 ½-inch spacing between the handrail and any surface and the actual 1 ½-inch handrail.
Recently we learned that the previous materials cost would be heavily inaccurate, due to using the incorrect materials and having improper designs for railing, which caused our price to more than double. With this change, we realized that it would be much easier and cheaper to simply regrade the hillside and not have to deal with railings. This has it's own costs associated with it, such as havin to move the beds, which would cause a need to change the plumbing, however, this cost would be much cheaper compared to having to make railings. Our new plan is to simply make a small sloped ramp and pathway.
Our new estimatedcost is around $5000 after taking out the rails and simply regrading and moving the beds. With this solution, issues with things such as spacing and cost are easily reduced.