Category Archive:Maintenance Tips

ByKevin Post

Is Your footbridge designed to fail?

When designing trails within parks or green spaces, rivers and creeks become an issue. How do you cross them? A small babbling brook might be able to be jumped across or crossed by hopping between a few rocks to continue along the natural footpath. This style of water crossing is not that accessible, nor are these natural forest footpaths. Trying to walk across this type of water crossing can be hard for a person with limited mobility, an issue of our increasingly aging population. The next option is much more expensive, a bridge must be installed to cross a little creek to a larger river.

The main materials for a bridge are wood, metal, and concrete. Each of these materials has its own design consideration; cost, longevity, maintenance, accessibility, access to the build site, just to name a few.

In 2012-2013, I was tasked with reviewing bridge repairs suggested from the structural engineer’s bridge reports. I noticed that some of the oldest bridges (around 100 years old), required less work than some of the bridges 90 years younger. Were these 10 to 15-year-old bridges designed to fail? I’m not sure but I offer these few tips to help ensure the longevity of your assets.

The first thing to know about rust on bridges is a bridge is like a very big, low voltage battery or electrical circuit. My landscape architect’s very basic understanding, as taught from an electrical engineer tasked with protecting gas lines:

  • Water and salts, make an electrolyte, which allows for the current to move through.
  • Sun, wind, moving water all create electric potential within the circuit/bridge.
  • The foundations create “Ground” and can complete the circuit.
  • Lesser “noble” metals protect more “noble” metals will.
    • Protection: oxidizing or rusting gives off an ion to join with oxygen to maintain the electric potential equilibrium.
    • Weathering steel will rust faster than stainless steel,
    • Stainless steel will oxidize faster than silver.
    • If you have weathering steel fasteners on a stainless steel structure, the fasteners will oxidize, rust and fail at a much quicker rate since it is trying to protect the stainless steel – as known as- equalizing the electric potential.
  • If you think about bridge design in this fashion, small items requested during the tender process and good maintenance can help to ensure the longevity of the bridge.

One of the more common bridge types I was reviewing was made from weathering steel (Core-ten). These young weathering steel bridges (10 to 15 years old) had few structural failures and required replacement. The following Design and Maintenance tips are based on my observations and research on weathering steel (a product that was originally designed for train boxcars for use in hot and dry South-Western USA)

Foundation Connection of Weathering Steel Bridge

Foundation connection of weathering steel Bridge covered with leaves, dirt and debris and has stainless steel fasteners

Weathering Steel Bridge

Weathering Steel Bridge with wood deck with overgrown vegetation surrounding bridge – designed to fail?

Failed structure of Weathering Steel Bridge

Structural failures of support members on the underside of weathering steel bridge with wood deck. Too close to water and vegetation, plus the wood holds moisture, which will keep the weathering steel rusting (bright orange)

Design Tips:

  1. Weathering steel (core-ten) must be placed in a full sun area that will allow it to dry completely each day.
    This repetitive wetting-drying cycle forms a very uniform, thick protective layer of rust with a constant colour.
  2. Constant moisture on the bridge will prevent the steel from forming a protective layer of rust and ironically will continue to rust (darker or brighter points or streaks on the surface)
  3. Design the weathering steel bridge, with a minimum 2 meters (6′ feet) above the water.
  4. Ensure the bridge is electrically broken from the ground (foundations) and into smaller units.
  5. Electrically insulate all connection points with dielectric insulating bolt sleeves and washers (PVC, rubber, ceramic, etc).
  6. Ensure the materials to be used are compliant with your de-icing products and needs (if used)

Maintenance Tips:

  1. Keep all vegetation cleared around the bridge to ensure the wind can dry the bridge throughout the day.
  2. Ensure leaves, dirt, and debris are cleared from the bridge, especially the bridge connections.

If the above recommendations cannot be maintained, it might be a better idea to use another material, such as wood or concrete if you don’t want to replace your bridge very 10 to 15 years at over $10,000 for a small 6-meter long bridge. In future blogs, we will look at other materials and design considerations.

If you need help designing your trails, locating your water crossings and types, creating tenders for bridge replacement or help to create maintenance procedures, please give us a call or email, we would be happy to help.

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Sincerely,
Kevin Post
Beyond The POST

ByKevin Post

Is your development site designed with snow in mind?

I’m one of those weird ones that like winter. Snowshoeing deep into the forest. Cross-country skiing under the clear blue winter sky. I even like the great workout I get, when there are a few inches of the white stuff freshly fallen from the sky.

I was taught in school that within most of Ontario, parking lots can lose up to 20% of their parking lot space to snow piles. That is about one space out of five, lost to snow! Luckily, most of our snow falls after New Year’s Day. But, early, before the Holiday Seasons, snow falls can eat up lots of parking space for those crazy last minute shoppers (like myself).

If you are designing a new site or adding a new building or expansion to an existing site, one of the best times to review your parking lot layout is during the site plan development phase. Before you submit the plans for review, examine where the snow will be pushed, piled, and stored? Here are a few discussion points to start the conversation with your design team and snow removal contractor:

  1. Where are the possible starting points for the contractor to enter the site and start pushing the snow around?
    1. Does your site have more than one entrance?
    2. Are there clear paths to push the snow to an end aisle?
    3. Will vehicles be parked overnight?
  2. Will conflicts occur between the snow windrow around the roads and/or large snow piles with the drive aisles and the pedestrian walkways?
  3. Are the walkways wide enough that the snow removal contractor can drive his/her truck and quickly remove the snow? Will they need to snow blow / hand shovel?
    1. For the small pickup sized snow plough, the walkway should be about 2.4m (8′ wide)
  4. Where is the snow going to be piled or will it be trucked off site?

As a landscape architect, with experience with snow removal, I can work with your site design consultant team to improve your parking lot and landscape design to ensure less space is lost to snow.

Hope these discussion points help to improve your site during winter. Feel free to send us any questions you may have about your site, especially if it is still in the design phase. We would love to hear your comments about our blog and any Site and Landscape Design topics you would like to hear more about.

Kevin Post
Beyond The POST
kevin@beyondthepost.com

ByKevin Post

4 tips to reduce poisoning your landscape

Winter Stream

Winter Stream – One reason to help reduce your salt use.

Here are four tips to help reduce poisoning of your landscape soils during winter. Less poison (not the rock band but salt – Sodium Chloride) in the soil will help to ensure your landscape looking good after winter. Discuss with your snow removal contractor these 4 points will help to ensure a healthy looking landscape after winter is over.

  1. Reduce your de-icing usage as much as possible. Do you require all walkways or roadways to be used or can you close areas to reduce your maintenance during winter?
      • Some office buildings have large concrete patio areas that are not used in the winter. These areas offer good places to reduce your winter maintenance and salt usage.
      • Ensure all fire exits are correctly maintained per the fire safety codes requirements in your area.
  2. If available in your area, look for a contractor which is certified through the Smart About Salt Program.
    • Smart About Salt certified contractors know techniques to reduce their salt usage and help to reduce the amount of salt entering our groundwater, streams, rivers, and lakes.
    • Better yet become a Smart About Salt certified site. Review the smartaboutsalt.com website for details. Benefits include (source: Smartaboutsalt.com):
      • Reduce your costs for winter salt management
      • Qualify for insurance premium discounts
  3. If you do need to use a lot of salt to keep your main walkways free of ice, after the snow/ice event has finished and the salt has dried, sweep up the excess salt for future reuse.
  4. Use salt alternates that are safer for plants. De-icers such as potassium chloride or magnesium chloride can reduce soil poisoning from sodium.

Hope these suggestions help to keep your landscape looking its best after the winter. Sign up for our newsletter for more tips regarding all aspects of the landscape from site plan approval process for new developments, trail design tips through to maintenance tips like this post.

Hope you have enjoyed reading this blog post and look forward to your comments, questions and the unusual tips you have found useful.

Sincerely,

Kevin Post

Beyond The Post

www.beyondthepost.com

ByKevin Post

3 reasons to site walk with your snow removal contractor

Now that the fall colours have started to set upon Southern Ontario, we will soon start seeing the white stuff falling from the sky. For some this can be a welcome sight. For others it means heavy jackets, salt covered boots, and long hours removing snow.

Before the snow flies, it is a great time to have a site walk with your snow removal contractor to help ensure your landscape looks great after winter. During your walk, discuss the finer points of snow removal. It helps to be able to see the ground, where the planting beds are, and how the land slopes. Understanding the site, how the melting snow will go, can help to reduce the damage to your landscape.

Morning after a early spring freezing rain

Morning after an early spring freezing rain storm


Here are three reasons why you should define where the contractor piles the snow:

      1. The heavy snow being forcefully pushed or dropped into the bed can cause perennials and shrubs to be ripped out of the ground or crushed to death.
      2. The weight of the dropping snow and ice can cause soil compaction which makes it harder for plants to grow.
      3. Salt in the cleared snow can build up to toxic levels for plants.

 

Planting beds receiving large amounts of snow usually do not fair as well as sod (grass) areas, or better yet, concrete or asphalt parking areas. Define which planting beds the contractor should avoid or if there is no room, truck the snow offsite.

Feel free to give us a call, and we can walk your site with your contractor and you to create a plan for the snowy season.

I hope these suggestions help to keep your landscape looking its best after the winter. Sign up for our newsletter for more tips regarding all aspects of the landscape from site plan approval process for new developments, trail design tips through to maintenance tips like this post.

I appreciate your time in reading this post and look forward to your comments, questions and the tips you have found useful.

Sincerely,

Kevin Post
Beyond The Post
www.beyondthepost.com