Formoustoychivost' Shpal Iz Pressovannoy Drevesiny
| AUTHOR | Medvedev Il'ya |
| PUBLISHER | LAP Lambert Academic Publishing (04/13/2011) |
| PRODUCT TYPE | Paperback (Paperback) |
Description
V nastoyashchee vremya v mire 60 % zheleznykh dorog ispol'zuyut derevyannye shpaly. Ostal'noy protsent sostavlyayut zhelezobetonnye, i polimernye shpaly. Srok sluzhby sosnovoy shpaly sostavlyaet ne bolee 12 let, srok sluzhby zhelezobetonnykh shpal sostavlyaet okolo 50 let. Nedostatki prisushchi i zhelezobetonnym shpalam: otsutstvuet dempfernoe svoystvo u shpaly, iz-za chego proiskhodit razrushenie kolesnykh par sostavov; uvelichenie sluchaev porazheniya lyudey elektricheskim tokom vsledstvie khoroshey provodimosti toka zhelezobetonom; vynuzhdennye zameny iz-za iznosa amortizatsionnykh prokladok kazhdye 7-8 let, chto privodit k bol'shim zatratam pri ekspluatatsii shpal. Na lesosekakh Rossii ezhegodno sgnivaet poryadka 70 mln. m3 drevesiny myagkikh listvennykh porod bereza, osina, ol'kha. Shpala, izgotovlennaya iz pressovannoy drevesiny po svoim fiziko-mekhanicheskim pokazatelyam ne ustupaet derevyannoy, no srok sluzhby sushchestvenno vyshe, chem derevyannoy. Odnim iz osnovnykh nedostatkov uplotnennoy drevesiny yavlyaetsya nizkaya formoustoychivost' pri vozdeystvii vlagi i vody.Dlya povysheniya formoustoychivosti predlagaetsya propitat' drevesinu pered pressovaniem sostavom na osnove karbamidoformal'degidnykh soedineniy.
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Product Format
Product Details
ISBN-13:
9783843325059
ISBN-10:
3843325057
Binding:
Paperback or Softback (Trade Paperback (Us))
Content Language:
Russian
More Product Details
Page Count:
156
Carton Quantity:
52
Product Dimensions:
6.00 x 0.36 x 9.00 inches
Weight:
0.52 pound(s)
Country of Origin:
US
Subject Information
BISAC Categories
Technology & Engineering | Environmental - General
Descriptions, Reviews, Etc.
publisher marketing
V nastoyashchee vremya v mire 60 % zheleznykh dorog ispol'zuyut derevyannye shpaly. Ostal'noy protsent sostavlyayut zhelezobetonnye, i polimernye shpaly. Srok sluzhby sosnovoy shpaly sostavlyaet ne bolee 12 let, srok sluzhby zhelezobetonnykh shpal sostavlyaet okolo 50 let. Nedostatki prisushchi i zhelezobetonnym shpalam: otsutstvuet dempfernoe svoystvo u shpaly, iz-za chego proiskhodit razrushenie kolesnykh par sostavov; uvelichenie sluchaev porazheniya lyudey elektricheskim tokom vsledstvie khoroshey provodimosti toka zhelezobetonom; vynuzhdennye zameny iz-za iznosa amortizatsionnykh prokladok kazhdye 7-8 let, chto privodit k bol'shim zatratam pri ekspluatatsii shpal. Na lesosekakh Rossii ezhegodno sgnivaet poryadka 70 mln. m3 drevesiny myagkikh listvennykh porod bereza, osina, ol'kha. Shpala, izgotovlennaya iz pressovannoy drevesiny po svoim fiziko-mekhanicheskim pokazatelyam ne ustupaet derevyannoy, no srok sluzhby sushchestvenno vyshe, chem derevyannoy. Odnim iz osnovnykh nedostatkov uplotnennoy drevesiny yavlyaetsya nizkaya formoustoychivost' pri vozdeystvii vlagi i vody.Dlya povysheniya formoustoychivosti predlagaetsya propitat' drevesinu pered pressovaniem sostavom na osnove karbamidoformal'degidnykh soedineniy.
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