The bridge deck is not designed to carry the vehicular loads. TB-1 and TB-3 require a wooden deck with a minimum width of 8 inches while bridge TB-2 . Preservative treat hardwood lumber using preservatives containing Copper Naphthenate (minimum 8% active ingredient) applied in the field by brush, spray or
Wood Preservation--Preservative Treatment For. Hardwood Glued-Laminated Bridges. Paul R. Blankenhorn, Peter Labosky, Jr., John J. Janowiak, and H.B. Manbeck,. Penn State University. D.A. Webb and R.T. Baileys, Koppers Industries, Inc. Abstract. Pressure-treating cycle guidelines were developed to.
Service Bridge Engineers, Steve Bunnell, Frank Muchmore, Sakee. Poulakidas, Ron Schmidt, Merv Eriksson, and David Summy; Russ. Moody and Alan Freas (retired) of the USDA Forest Service, Forest. Products Laboratory; Dave Pollock of the National Forest Products. Association; and Lorraine Krahn and James Wacker,
Outline. A few statistics. Background types of timber decks. Longitudinal elements. Transverse elements. Transverse Timbers on Steel Beams. Design basics. Hold-downs. End dams end treatments. Asphalt overlays. Railings. ASCE Timber Bridge Survey. Closing Thoughts. 2
preservatives are covered, but the focus is primarily on timber treated with oilborne preservatives. Asphalt paving failures on the decks of treated timber bridges are caused by one or more of the following deficiencies: Bridge deck design and construction. Type and quantity of the wood's preservative treatment. Design
information evaluated, these general conclusions were made: copper naphthenate was recommended as the plant-applied preservative treat ment for timber bridges, American Wood Protection Association Stan dards and Best Management Practices should be followed to ensure high-quality treatment of timber materials,
29. 6.5. Lift & swing bridges. 29. 6.6. Further design fundamentals. 29. 7.0. MATERIALS. 31. 7.1. Principal elements. 31. 7.2. Decks & decking UK current practice. 36. 7.3. Parapets & handrails. 37. 7.4. Connections. 38. 8. DURABILITY. 40. 8.1. Detailing. 40. 8.2. Natural durability. 42. 8.3. Preservative treatments. 44
Asphalt paving failures on the decks of treated timber bridges are caused by one or more of the following deficiencies: Bridge deck design and construction; Type and quantity of the wood's preservative treatment; Design and installation of the asphalt paving system. Deck deflection and movement (the
state. Surface preparation of the bridge deck is perhaps the most important step in asphalt paving. As discussed in Chapter 4, bridge components are treated with oil-type preservatives because of the added moisture protec tion oil-type preservatives afford. Some of the same qualities that provide this added protection affect
Manufactured using proven durable glue system together with 100% veneer preservation treatment method, the product is well designed for the adverse climatic conditions of bridge applications ensuring a long design life. Developed as a renewable alternative to traditional hardwood sawn timber NiuDeck is manufactured
b. preservative treated rough lumber must be only Coastal Douglas-fir (Coastal D-Fir), except where noted in appended Tables 1 and 2. Treated lumber must be treated in accordance with the ministry's Pressure Treated Wood Standard for Timber Deck. Bridge Components corresponding to the required lumber species and
Wood preservative products are those that claim to control wood degradation problems due to fungal rot or decay, sapstain, molds, or wood-destroying insects. Both the treatment process and the use of treated-products can result in exposure to pesticides for both people and the environment. Most of the treatment
Abstract. Bridge owners often view timber bridges with suspicion. Can a timber bridge carry the required highway design loading? Will a timber bridge last 75 years? Are there crash-tested rail systems available? Can a durable wear surface be installed on a timber deck? Is the preservative treatment environmentally safe?
Often more economical than concrete or steel, Glu-Laminated Wood Bridge Construction involves a variety of materials to create a wide range of styles and shapes. Preservative treated GluLam structural wood timbers also offer a life expectancy of three times that of steel or concrete. Pedestrian bridges, light traffic bridges,
Extending the service life of timber bridges is our signature service. Since 1954, literally tens of thousands of timber structures have benefited from a detailed inspection followed by in-place preservative treatment. The careful placement of specialized wood preservatives can greatly extend the life of the timber components.
U.S. Bridge will supply the timber, nails and attachment clips for the project. Treated lumber is used for the floor and is separated by a thin neoprene sheet to protect the weathering or galvanized steel from interaction with the preservative treatment's chemicals. The floor can remain exposed or be topped
This chapter covers the design of spike “laminated deck” superstructures made of timber. This type of structure has a laminated wood deck, where a series of laminations are placed edgewise and oriented in the direction of the span of the bridge. They are spiked together on their wide face with deformed spikes to create a
sub-deck planks. cross-ties. stringers. other rough lumber components that may be utilized in bridge construction (e.g., timber sills, ballast wall timbers). If the ministry specifies preservative treated rough lumber for bridge components, the lumber must be pressure treated to meet the requirements of this
bridge builders put a roof over the bridge to keep the water off the untreated timber. They had noticed that the wood they used to build their houses did not rot like wood left out in the elements. Many of these covered bridges still exist today, still without any preservative treatment just a roof to protect the structure.
Applied correctly, wood preservatives can increase the life of timber structures by as much as five times or more. A complete approach to the preservation and protection of timber bridges involves many considerations related to materials, preservative treatments, design details, and construction practices. This chapter