Mm-hmm [AFFIRMATIVE]. Did you make this project? via Space Invading, Your email address will not be published. As demand for them has diminished, S Shapes are very limited in availability, especiallyin deeper sections. Registration on or use of this site constitutes acceptance of our In this episode we scratch build a car bridge over a ravine. Initial evaluation indicates that building up the takeoff point about 1 to 1 1/2 feet will help the participants to mount the rope once it is properly tensioned. The advantage over a standard drill bit is that you can drill ten holes without having to change bits. We're careful to make sure the tread overhangs both beams equally. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/16\/Build-a-Drainage-Ditch-Bridge-Step-1-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/1\/16\/Build-a-Drainage-Ditch-Bridge-Step-1-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> License: Creative Commons<\/a> Idletyme Reservations,
Puerto Rico Address Format Usps,
Stage 2 Swimming Lesson Plan,
Why Do We Daydream While Listening To Music,
Wood Bulkhead Cost Per Linear Foot,
Articles H
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/52\/Build-a-Drainage-Ditch-Bridge-Step-2-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-2-Version-2.jpg","bigUrl":"\/images\/thumb\/5\/52\/Build-a-Drainage-Ditch-Bridge-Step-2-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-2-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/46\/Build-a-Drainage-Ditch-Bridge-Step-3-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-3-Version-2.jpg","bigUrl":"\/images\/thumb\/4\/46\/Build-a-Drainage-Ditch-Bridge-Step-3-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-3-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/fe\/Build-a-Drainage-Ditch-Bridge-Step-4-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-4-Version-2.jpg","bigUrl":"\/images\/thumb\/f\/fe\/Build-a-Drainage-Ditch-Bridge-Step-4-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-4-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4a\/Build-a-Drainage-Ditch-Bridge-Step-5-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-5-Version-2.jpg","bigUrl":"\/images\/thumb\/4\/4a\/Build-a-Drainage-Ditch-Bridge-Step-5-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-5-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/11\/Build-a-Drainage-Ditch-Bridge-Step-6-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-6-Version-2.jpg","bigUrl":"\/images\/thumb\/1\/11\/Build-a-Drainage-Ditch-Bridge-Step-6-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-6-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/2e\/Build-a-Drainage-Ditch-Bridge-Step-7-Version-2.jpg\/v4-460px-Build-a-Drainage-Ditch-Bridge-Step-7-Version-2.jpg","bigUrl":"\/images\/thumb\/2\/2e\/Build-a-Drainage-Ditch-Bridge-Step-7-Version-2.jpg\/aid4489758-v4-728px-Build-a-Drainage-Ditch-Bridge-Step-7-Version-2.jpg","smallWidth":460,"smallHeight":334,"bigWidth":728,"bigHeight":529,"licensing":"
\n<\/p>
\n<\/p><\/div>"}. And just clamp that --. Also make the sure spot is less than 6 . $4.97. The force on a bridge because of its own weight. Q. Copyright 2023 Red Barn Media Group | Web Development By Infomedia, Massey Ferguson 2600 H Series utility tractor. By Hank Will | Illustration by Ray E. Watkins, Jr. loaded concrete truck for the construction of the house, so he made sure the other fire-related requirements were factored into the driveway plans as well. Additionally the ravine will be deepened slightly so that participants will not touch the ground at the midpoint. Grade the approaches to the bridge to offer a smooth transition from the ground to the end of the decking. Step two: Lay some stringer logs across the span. It is located over the Guadalevin River, in the town of Ronda in the Andalusian province of Malaga. Jon Ford had plans to build a new bridge along with building a new house on his property, but plans for the bridge were made top priority when a wayward truck carried too much weight over the old bridge and it collapsed. Bridge House Design a bridge over a ravine. Now I'm going to bolt these together with galvanized bolts. It has a flat deck with angled railings. Height This How To Build A Bridge in Valheim. Copyright 2023 engineering.com, Inc. All rights reserved. have been prepared. They were able to use the same form panels for this knee-wall portion of the abutment by positioning the panels at the desired elevation, which was flush with what would be the surface of the bridge deck. I'm looking at building a bridge over a small gully. I cut off 8 feet from the thicker end of two of the poles to use as headers. There is a small drainage ravine on my property, flowing into a pond, which cuts off a trail that circles the pond and the property. He then used an electric impact driver to torque the nuts onto the stringer bolts. Built of laminated four-by-six support beams, pre-cut posts, decking and side rails, the 12-foot length of bridge will span the gulley resting on heavy block piers. For this bridge, which was designed with I-beams, the two foundation pieces that support the ends of the beams are called abutments. This DIY organizational system is perfect for zip ties so you have them handy wherever you go. Most bridge builds require considerable planning, especially when it is located over a waterway that is under the jurisdiction of several different government agencies. amzn_assoc_asins = "B00ARLYR7Y,B072F71W7G,B0874NWCZT,B0871Z2ZZJ"; Installing a new Corian Vanity Top is a fulfilling project for any serious DIYer. (Mind you, there are a few extra touches and tricks of the trade well be telling you about.) I ended up dragging it with the ATV as well, but it was a major effort, requiring help from the neighbors. Level the ground, position and level the piers, and temporarily clamp them to the planks. See more ideas about backyard, landscape, outdoor gardens. My original plan was to then attach 10 foot lengths of 4x4 across the gaps between the smaller blocks making a continuous bumper while letting rain and debris wash away underneath it. amzn_assoc_placement = "adunit0"; What the cutting torch lacks in precision, it makes up in speed and mobility. We don't want to be climbing up and down those. Next, they built the header forms around the ends of the I-beams. I am placing 5 logs across the ravine. Silhouette of jumping woman over chasm between mountains. Bear? Esther, you go first. While torquing down the nuts, Mike used his Speed Square as a straight edge to make sure the bolt heads were flush with the top of the stringers. Estimates of costs and benefits (due to decreased travel time, fewer accidents, reduced gas usage, etc.) A channel at least 3 feet wide by 8 inches deep with a U shaped (not V shaped) bottom must continue to exist at no less than the same depth as the existing low point. Should the bridge be built? Two open courts on the upper level one acting as the entrance way and the other leading to the pool connect this contemporary house design to nature. The extra length is to get the footings at least 2 feet back from the creeks banks. Get Ron's videos and articles delivered to your inbox every weekend. Very slippery when wet, and sliding off into the ditch would be bad. Thanks! Four children . And then we can take our straight edge, run it right along the side of the post -- back it off just a touch and draw this line, okay. Thirty four. CCA wood is greenish. Should the bridge be built? ravine stock pictures, royalty-free photos & images. More example sentences. Splices and joints in the base plates were offset from connections in the panels, which made the entire assembly stronger. In the unlikely event that a government agency is not giving you specifications for elevation and span on your bridge project, make sure you are above the 100-year high water mark. Clamp 12-foot planks to the first two piers, ensure they are parallel and mark the other ends as locations for a second pair of piers. This means that the sides of the new ditch have to be steeper thus the need for stone lining. 2003-2023 Chegg Inc. All rights reserved. So I tried to build in the centre to see how high I could go if I switched over entirely to reinforced wood beams. Drill four 8-inch-diameter (or larger) holes, completely inside the rectangles corners, at least 3 feet deep with your tractor. He had to certify a base flood elevation and hire an engineer to draw up the bridge plans as required by the County. ESTHER KILLIAN: Measure the distance between the outer edges of the two beams for tread length and add two inches for overhang. Getting my hands on three utility poles gave me a great underpinning to the bridge and let me actually begin the process of building it. My ATV has a ball hitch, so I was able to simply drive that to the site. Dropping almost vertical for much of its 532 foot (162 mtr) depth, the Grande Ravine site is perfect for a frame bridge. The Karve has a small item compartment that players can use to store extra . One day, we will be building a house on the other side of the ravine, so I am trying to design the bridge so that a fully loaded concrete truck can cross-over. That said, this model has a serious weak point in the threaded connector that assembles the handle. Just like with house construction, the sub-base for the foundation must be shaped and compacted first. I'm pretty sure my local lumber yard doesn't stock that normally. I have a pretty good idea of what kind of bridge will work best here. Privacy Policy. Hopefully yours has stood the test of time! Image of associations, imps, Without the ability to officially build one of New Horizons' bridges over the air, some players have turned to creating fake bridges instead. Maine State Clamming License, They could have done the job with standard concrete truck chutes on the road side of the bridge, but they definitely needed the concrete pump to move the material to the footings on the other side of the creek. A rope bridge over a trees. Build this simple structure and cross that ditch or swale with ease. 1.1. Two adults the driver and his partner were seriously injured in the crash. Start over here at this end, run the tape measure across to the outside. John Hayes: I want to build a low-cost bridge over a deep ravine on my property. Simple yes/no answer will not qualify for credit. The ends of the deck planks will extend beyond the outer timbers by about 2 inches on each side. That additional length of the bridge had potential to add thousands to the cost of the bridge in engineering costs, added materials and stronger beams. We had to use ATVs to get to the rear part of our hunting property. wikiHow is where trusted research and expert knowledge come together. Cut sufficient 2 x 6 x 4 lengths (approximately 25) of treated lumber to deck the existing superstructure crosswise its entire length. It doesnt have to be a significant river for several governing bodies to claim control over the rights to build any kind of structure near the waterway. A wider creek is bridged by a simple wooden bridge with logs hewn in half and placed next to one another. Akasya Ahap Ambalaj sizin iin 24 saat ve 365 gn kesintisiz olarak almaktadr. They should construct a workbench on either side of the body of water where the ends of Allow to dry. By signing up you are agreeing to receive emails according to our privacy policy. ), that the approach angles to the bridge be within specifications, and that a turnaround was provided on the other side of the bridge. A standard auto bridge can easily cost over $5 million and is closer to $10 million on average. The third stringer is simply centered between the outer two. There are a few ways players can place their foundations, but the easiest seems to be using 2x2 Floor Tiles. Were committed to providing the world with free how-to resources, and even $1 helps us in our mission. Apply construction adhesive to a 12-foot two-by-six plank and clamp another on top. Pointed Skis Vs Rounded Skis, The soil is moist, so the digging goes quickly. A bridge that is built too low, or with a span too narrow, can cause a significant choke point during those winter storms or spring thaws that bring streams out of their banks. a committee that was formed to create a bridge between rival parties. I anticipated it for pedestrian use but you have made the ATV bridge look practical to build. Since the stringers were each a different diameter, the notch cradling each stringer needed to be slightly different depth. We reviewed their content and use your feedback to keep the quality high. Anasayfa; Hakkmzda. To locate their position, we lay the ends of two 12-foot planks on the piers we just installed, and extend them across the creek, measuring to make sure the planks are parallel. I can appreciate the work you've obviously put into this project because I've built something very similar back about a decade or so ago in the woods for the exact same reason. Mike used a heavy-duty drill (with side handle and hole saw)followed by a chisel to cut pockets deep enough to receive the washers and carriage-bolt heads for the stringer beams, which were attached to the top of the I-beams. Trestles. They are D logs - flat on one side and semi round on the other. Ted's Bio; Fact Sheet; Hoja Informativa Del Ted Fund; Ted Fund Board 2021-22; 2021 Ted Fund Donors; Ted Fund Donors Over the Years. With a database of over 10000 questions the library will remain available for an extended period. You can "abuse" the game's definition of a room to easily build bridges across long spans. Use a speed-square to mark cut lines on planks that butt into railing posts and notch them with a jigsaw. Q. We use a clamp to hold the hand rail in place and secure it with rust-resistant screws. Esther, let's measure the width of these beams now. Ideas? Position footbridge beams on piers and drill holes into the wood through the metal strap on each pier. The Forest Service design provides for a header to be placed directly on the ground at each end of the bridge. Okay. Enjoy! First, build a tower on each side. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. STAR KILLIAN: I ended up finding a local saw mill operator who showed me Tamarac, which is naturally weather resistant wood and grows locally. Detailed plans, drawings, pictures and instructions. The Get flagging tape. He also added 46 curbs along the outside edges of the bridge decking. Qualifying purchases could enjoy No Interest if paid in full in 6 months on purchases of $99 or . Fixing a Clogged Bathtub Drain without Calling a Plumber, How to Install a French Drain System in Your Yard, How to Unblock a Clogged Washing Machine Drain. Then the ends of the stringers (joists) sit directly on the headers and extend across to the opposite header. Now we cross to the other side of the creek and get ready the set the two remaining piers. For decking, I had been watching Craigslist for some time, hoping to find used lumber or scrap deck boards, but was not finding what I needed. This combination of adhesive and bolts will give us a strong, stable, warp-resistant beam. The site is sponsored by AGCO Corporation and covers farming and the farm life our readers live, as well as love. Use the links below to plan your visit to the Society's Archives. Our bridge is plenty stout for a 4-foot-wide by 12-foot-long span that will handle a 1,000-pound live load. This modern house, set on a 15-acre wooded property, stretches 22 ft. across a grassy ravine. The tool was critical to manipulating these poles, which are otherwise much too heavy to manage. He ran the bolts down through the stringer beam and through the top flanges of the I-beams. First, they will want to decide exactly which point they want to construct the bridge at. THE LATEST TRENDS IN MODERN HOUSE DESIGN AND DECORATING, Created by architect Stanley Saitowitz of San Francisco, California-based Natoma Architects, Inc., this bridge house design in Marin, California is as gorgeous as it is unusual. amzn_assoc_region = "US"; This bridge provides an arched walkway, I am building a bridge to span across a small ravine on my property. But as I was clearing brush near the bridge I removed two tall narrow trees, which will make for great bumpers and a more natural finishing touch to the bridge. 70% like this 6 Achievements. Print out this index page and present it to the librarian. CCA treated wood contains arsenic, wear a gas mask while drilling or cutting and handle with gloves. 12/23/2014 11:27 PM. If you use binder twine, double it over and twist it a few times before you start the lashing. EHT reader Michael Kober, P.E., came across this article and suggested that more emphasis should be placed on the importance of having adequate foundation members for optimum long-term performance, particularly resistance to flooding and scour conditions. SUPPLIES Two or three suffi ciently Two businessmen collaborate to build a bridge. Make sure to add the pillars to support the bridge. Luckily, there a few tricks that Valheim players can use to make bridge building a little bit easier. ESTHER KILLIAN: To do this, I first line up my speed square with the post. Voter Turnout Statistics By Year, Among the agreements was a plan that the Allentown Bridge Company, a subsidiary of the LVT, would turn the bridge over to the city when it had paid for itself in tolls. This bridge adopts more of a picket fence design, and lets the light aging give the structure character. Also added to the government agencies was FEMA, which presented an inaccurate map showing that the entire property was in the flood plain. While adding pillars in the starting part of the bridge is quite easy, you might face difficulties in doing so in areas where the. Step three: Add flooring. Okay. One other adult and 18 children were treated for minor injuries, authorities said. Mar 4, 2020. After completing the main deck of the bridge, Mike added a series of three 212 runners as added strength for the area where the rubber meets the bridge. Hikayemiz; Misyon & Vizyon; Kalite Politikamz; Sertifikalarmz; ISPM-15 aretleme zin Duyuru; Sosyal Sorumluluk; Hizmetlerimiz To seat the spikes the last couple inches down into the counter-bored holes, I used a heavy bolt as an extension rod, which let me continue hammering the spikes as they disappeared into the stringers. True I-Beams(originally known as American Standard Beams) and more recently, S Shapes, were popular in the early 1900s for all types of steel construction, but have largely been replaced by W Shapes. The engineers say the process is ideal for unusual terrain and reduces time and cost. These works form part of the Government of Saint Lucia's Community Road . As a small thank you, wed like to offer you a $30 gift card (valid at GoNift.com). Step three: Add flooring. Sister two ground-contact treated 2 x 10 x 12 dimensional boards by using 10 penny nails staggered every 8 inches or so to nail them together along their entire length. We use cookies to make wikiHow great. The span of the bridge needed to be about 20 feet. Which way -- we'll go this way? Our project assumes that you dont have to worry about swift water flowing over the banks of the ditch and that you dont require a permit for your project. Laminate Two-by-sixes into a Pair of 12-Foot Support Beams. The beams will be 4 x 6 timbers that we'll make ourselves by laminating two 2 x 6's together. Post and Beam Over the Ravine. One way to calculate the cost of a highway bridge is $4,000 per linear foot. Also make the sure spot is less than 6 feet (1.8 m) across. It is the perfect bridge to go over a small water feature. Strap-On Cleats for Ice and Snow Traction, Backyard Treehouse With Zip Line, Trap Door, and Sliding Door, Hollow Wood Surfboard - Plywood and Cedar. amzn_assoc_ad_type = "smart"; Five of the deck boards were 4 feet longer than the other twenty deck boards. As my stepdad explained it to me, any time you say " [something positive about something] But [something negative about something]" It completely nullifies the positive element of the statement and will come off as negative. how to build a bridge over a ravine testimonios de personas operadas de tiroides. If the latter isnt the case, you will want to consult with your local permitting agency and possibly an engineering firm before proceeding. Well, I can see the problem. The Karve has a small item compartment that players can For the suspension bridge model, cut the string (or small-diameter rope) into three 2-foot (.6-m) lengths and one 4-foot (1.2-m) piece. DOWNLOAD detailed plans for a version of this bridge used by the U.S. Forest Service >>. Just getting these utility poles to the site was a major effort. Postcard North Carolina Wilkesboro Boone Trail Ravine Bridge Linen Era. You need to add pillars in the areas where the floor is red. The longer deck boards were designed to cantilever beyond the primary deck and serve as support for a planned railing system along the bridge. Adjust the positioning to ensure the timbers are parallel and square. Then fill with concrete or an 8-inch-diameter post. RON HAZELTON: I am placing 5 logs across the ravine. 49 backyard garden bridge ideas and designs includes wooden garden bridges, Japanese garden bridges, small bridges, red bridges and more. Next, build an anchorage on each side. Glowing Fairy Garden Bridge. While you might be able to procure a culvert and haul in sufficient fill to create a path across the gap, in many cases a bridge is more practical and aesthetically pleasingand it may be the only method permitted in the case of controlled waterways. 15 years ago Source: Step two: Lay some stringer logs across the span. Fort Snelling Immigration Court, Look for Build a Bridge in the search bar at the top right corner. Make sure the truck drives safely across to complete each level. have been prepared. This The following video by Spudetti will guide you each step into building a suspended bridge connecting two high places, decorated with vines and using Jungle Wood blocks as the main resource for the structure. Gate Bridge - Like the name suggests, this bridge uses a gate that players can open or close. The forces acting on a bridge that are not part of the bridge. This is it. Ravine Bridge Boone Trail Wilkesboro Boone North Carolina Linen Postcard. [LAUGHS] [A] Footing bolts go through the bottom flange and are anchored into the concrete with epoxy; [B] carriage bolts go through the stringers and through the top flange; [C] short bolts go through the web of the I-beam to attach an angle-iron bracket; [D] long bolts go all the way through the abutment knee-wall and attach the angle-iron bracket to the knee wall; [E]a hole through the knee-wall houses a conduit of PVC for the water supply line. Mike and Jon predrilled the I-beam flanges for the bolts that would fasten the wood stringers to the steel beams. $2.75 + $1.75 shipping. Photo about Shot wooden bridge over the creek, built ages ago, not in use now. Bridge building. (Mind you, there. STAR KILLIAN: Well --. We tighten the nuts until the washers just begin to compress the wood. In the video, I include short build animations and bridge details that will make you confident enough to make your own bridge over water. Dont be afraid to modify the following plan to suit your situation, but be keenly aware of load-bearing capacities for the lumber you choose and the length of your span. To create this article, 9 people, some anonymous, worked to edit and improve it over time. The stringers functioned as the transition between the steel support beams and the wood bridge deck. All right, let's drop it down. This would make a great bridge for nature trails. If using concrete, take care that each pair of footings is at the same levelslightly above grade is ideal, if you can find an appropriate form. A rope bridge over a trees. A culvert is a semicircular piece of galvanized steel or polyvinyl chloride that fits over a creek like a small bridge. Lowes provides instructions on the building of a small footbridge without railings A very simple arched bridge. Step one: Build a good base on each side of your waterway. How to play: Click or tap to build your bridge. Well, today I'm headed to Eureka, California to visit Star and Esther Killian. Use it to try out great new products and services nationwide without paying full pricewine, food delivery, clothing and more. And this has made this installation really simple. 2. how many sharks are left in the world 2021; baked chicken with bell peppers and onions; pastor ed young daughter; The subsequent components were attached using wood-to-wood fasteners, including lag bolts and deck screws. That spacing would leave 1.5 feet of the deck cantilevered off each side of the outer bridge joists. . By building a bridge over a ravine, a state department of transportation can shorten the time it takes to drive through a mountainous area. According to USAID, the former bridge, located over a ravine, was severely deteriorated and in need of replacement. I can imagine water rushing through here and also, these banks -- I guess you were telling me, get really slick, huh? Place a floor piece above the last piece (from the middle of it). So let's --. The Let's build a rope suspension bridge. Now we can make this bridge a bridge, make it walkable, huh? john deere camo gator for sale; how to build a bridge over a ravine. wikiHow is a wiki, similar to Wikipedia, which means that many of our articles are co-written by multiple authors. By using our site, you agree to our. Tie cross rails Before you start building the bridge, you need to make sure that you have a workbench on either side of the water body. The project begins by establishing the elevations for both the top of the bridge and the bottom of the bridge supports that span the stream. Pull on the long end of the rope to tighten. Benefit cost ratio = Capitalized value of annual user benefits / With this in hand, I decided to build my bridge. STAR KILLIAN: Nothing very technical though. Admittedly, there are good reasons for many of these regulations. First, scan the area. A little silicone in the hole and we can drive in our bolts, screw on the nuts and tighten them with a socket wrench. Simple garden bridge plan spans 6' 10". The visible difference between S Shapes and W Shapes is the fact that the former have tapered-faced (not parallel) flanges, while the latter have parallel-faced flanges. Probably around 500 dollars (US.) This will need some support, so you will have to add pillars along the way. Do you have any animals on the property? I bought a box of 4 inch weatherproof construction screws to attach the decking. If you want to know how to build a bridge over a creek or small river, this is a great how-to video that walks you through everything from building the trusses to making the proper attachments.