The timber bridge manual is a reference document only. Evaluation of a microdrilling resistance tool hdr engineering. The unified facilities guide specifications ufgs are published only in electronic format and are intended to be used with specsintact software. Discussions are general in nature and are applicable to most timber bridge types. An overview of timber bridges transportation research board. Standard plans for timber bridge superstructures forest products. Timber sale, stewardship, and forest products contracts and permits. In practice, all maintenance is either preventative or remedial. Bill woodward, usfs guidelines for highways on bureau of land management and u. A comparison of us and canadian bridge codes authors. Forest service lands arizona department of transportation arizona department of transportation adot federal highway administration fhwa bureau of land management blm united states forest service usfs 2008. Timber bridges forest products laboratory usda forest service.
Section 8 covers the preservative and protective treatment of all timber bridge. The course was presented to more than 140 participants in minnesota and iowa. The standard drawingsdesign aids have been designed and developed in accordance with forest service manual and forest service handbook directions. The trail bridge types, decks, rail systems, and abutments sections contain sketches, pictures, example andor standard drawings, and guidelines for appropriate use with the usda forest service recreation opportunity spectrum ros classifications. Allowable code design stresses are based on the strength of. Manual timber design requirements, procedures, and recommendations addressed in this manual. Timber sale, stewardship, and forest products contracts. Timber bridges once formed a major part of new zealands roading network.
Page 379 new time effects factor c new time effects factor c dd 2. The bridge deck is not designed to carry the vehicular loads. Guidance for the use of these forms can be found in forest service handbook fsh 2409. For the past 20 years, beam bridges have been constructed almost exclusively from. Maintenance activities are divided into categories that vary in definition and scope among different agencies. Timber bridge maintenance manual department of transport. The national forestry handbook nfh contains methodology, procedures, and related reference.
The timber products output tpo group conducts research to estimate and track timber. Minnesota department of transportation exclude pdfs minnesota department of public safety driver and vehicle services. Hand calculations based on usfs timber bridge manual reference bridge design procedure prepared by mark ferry define basic bridge configuration and design criteria see step 2 select beam combination symbol determine deck dead load and dead load moment determine live load moment determine beam size based on bending. In the forest service, handrails are required on all bridges unless an analysis design warrant shows that the risk of falling off the bridge is minimal or the trail itself presents a higher risk. Department of agriculture, forest service, em77008. The format is intended to allow flexibility for additions and updates.
The photographs and construction details in this tech tip originate from a project completed at the tombigbee national forest, mississippi, by trails unlimited, a u. Design of longitudinal deck superstructures pdf chapter 9. En 19952 timber structures bridges eurocodes background. This manual is dedicated to kevin collet who passed away on 24th august 2003. This manual attempts to show builders the good practice of producing houses so that these houses can perform in a manner as expected of a good timber house. Usda forest service, engineering staff, washington office.
Finally, researchers described techniques for using inspection tools in the timber bridge inspection manual, which supplements minnesota dots bridge inspection field manual. A simple, inexpensive, 12footlong sawn timber bridge that was designed for an allterrain vehicle atv trail is also suitable for horse, bicycle, and pedestrian trails that cross small drainages. While many of the original timber bridges have been replaced with concrete and steel structures, timber is still a significant component of this countrys bridge stock. Trail bridges range from a simple foot bridge with a handrail figure 62 to multiple span, suspended, and truss structures. Standard drawings, or example drawings, are intended for informational purposes only. You have joined an elite group, and as you begin making great memories using your new forest river rv, we. Sale and disposal of national forest system timber 36 cfr part 223. The fundamental principles of timberframed housing are also explained. Foia request usda departmental foia officer 1400 independence ave.
National forestry handbook preface the national forestry handbook, as a subdivision of the nrcs directives system, includes parts 635 through 638. Missoula technology and development center, usda forest service. Properties of wood and structural wood products pdf chapter 4. James scott groenier, missoula technology and development center, usda forest service, 5785 highway 10 west, missoula, mt, 59808. Pdf several changes relating to timber bridges have been incorporated into the. The bridge material templates are living documents and it is recommended that the latest templates be accessed and utilized when ordering bridge materials or developing contracts with bridge material supply phases. See nc forestry bmp manual for culvert sizing recommendations. All steel portable bridge docx all timber portable bridge docx timber deck materials docx. All bridge drawings should be approved for each specific bridge by a qualified engineer with trail bridge design experience. All exposed soil at existing or new crossings will be stabilized with any one or combination of the measures recommended in the nc forestry bmp manual. In this chapter, timber bridge maintenance is divided into the three following categories. For the purpose of these guidelines, road construction includes excavation of gravel quarries and borrow pits. Wacker, forest products laboratory, usda forest service, one gifford pinchot. Forest river travel trailer owners manual pdf download.
Forest inventory and analysis national program timber. Bridge inspection inspection guidance manuals mndot bridge and structure inspection program manual 2019 pdf 35 mb mndot. Read the manual to determine appropriate design and construction specifications for bridges on forest service roads. They are constructed of glulam or sawn lumber components and have historically been the most common and most economical type of timber bridge figure 71. The standard drawings can be downloaded, in pdf file format. Topics include the preparation of engineering drawings, bridge fabrication, handling, transportation, storage, and con struction. The objective of timber cruising is to provide reliable estimates for timber appraisals. The ufgs master uses the latest csi masterformat, therefore, as of january 2012, the ufgs working group decided to discontinue support of masterformat 1995. Tracking aashto code issues impact dynamic load factor equal to 1. Timber truss bridge comprises timber members bolted together. The final rule reflects the views and concerns of thousands of people who expressed interest during the rulemaking process, which ran from october 2006 to. Regions and forests shall use the procedures provided in this handbook when cruising timber for sales, free use. Canadian bridge design codes, highlighting similarities and differences that relate to. Russ moody and alan freas retired of the usda forest service, forest.
Beam superstructures consist of a series of longitudinal timber beams supporting a transverse timber deck. Standard plans for timber bridge superstructures forest service. Please read all component manufacturers owners manuals provided with your rv and file appropriate individual warranty cards as required. Usda forest service fsgeodata clearinghouse download. This chapter addresses proper techniques and procedures for timber bridge fabrication and construction.
Ibach chapter 14 contents wood preservatives 142 oilborne preservatives 142 waterborne preservatives 149 preservative effectiveness 1412 effect of species on penetration 1412 preparation of timber for treatment 1417 peeling 1417 drying 1417 conditioning of green products 1418 incising 1418. The timber volume estimate serves as the basis for payment on tree measurement sales or for bidding on scaled sales. Research pays off innovative inspection devices help. The manual comprises eight sections, encompassing the maintenance and rehabilitation of all timber bridge types including trusses, beamgirder spans, stress laminated bridges, concrete overlays, timberconcrete composites and includes timber substructures. Basic timber design concepts for bridges pdf chapter 6. The majority of the timber design requirements in aashto are based on the national design specification for wood construction nds. Design, construction, inspection, and maintenance, u. The standard drawings can be downloaded, in pdf file format, from the table below.
Design and construction of the pochuck quagmire bridge a suspension timber bridge also. National bridge inspection standards 23 cfr part 650, subpart c. The design of the wooden deck follows the procedures of the timber bridges. These regulations establish access requirements for mining claims. Dolt hole, diameter in timber 16 16 16 1516 washers, standard round, cast or malleable iron, diameter 3 3 3 312 round, wrought iron, minimum diameter 2 2 2 214 thickness 532 532 532 1164 square plate. These regulations govern road construction related to forest service timber sale appraisals and contracts. As a timber bridge foreman, kevin had extensive handson experience with main roads timber bridge maintenance in central queensland, working for roadtek, central district. Additional trail bridge resources us forest service. His knowledge and expertise in timber bridge work has been of invaluable assistance to bridge. Hoosier nf timber management timber harvest sales conversion of nonnative pine to native hardwoods improve forest health and diversity wildlife habitat creation and maintenance regeneration of oakhickory, maintenance of barrens providing forest products to support local economies timber target generally 3 4 mmbf year since 2010. Guidelines for highways on bureau of land management and. Both hs20 and hs25 loadings are included, along with l360 and l500 deflection criteria. Preservation and protection of timber bridges pdf chapter 5.
Handbook on structural timber design to eurocode 5 is en. Update on activities of the ascesei timber bridges committee. Page 1 travel trailer owners manual begin the journey. The forest service sells timber and special forest products on a variety of contract and permit forms based on the complexity andor value of the sale. Department of agriculture, forest service, forest products laboratory. As part of the usda forest service, northern research station, forest inventory and analysis nrsfia mission is to provide comprehensive assessment of the past trends, current status, and future potential of the regions forest.
Forest service usfs correspondence handbook style manual, 2005, 2007. The following information is provided for reference only. Handbook on structural timber design to eurocode 5 is en 199511 rules including strength capacity tables for structural elements james harrington1, malcolm jacob and colin short 1 james harrington and associates, four one the rise, mount merrion, co. Osha standards for trail bridge university of montana. Forest products laboratory one gifford pinchot drive madison, wi 537262398 phone.
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