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Lecture 4: Railway Engineering ( هندسة السكك الحديدية ) Dr. Alaa Gabr
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1.
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2.
11/11/2015 2 اﳌﻔﺘﺎحSwitch Turnout السكك في استعماال
التفريعات أكثر من يعتبرالحديدية المفتاح استخدامات •الالمحطات في آلخر خط من القطارات نتقال •المحطات ضمن وتفكيكھا البضائع قطارات لتجميع •الخطوط علي وااللتحام التفرع لتحقيق اﳌﻔﺘﺎح ﻋﻨﺎﺻﺮ أساسية مناطق ثالث من المفتاح يتكون: االبرة منطقة:حوالي طوله مكشوط حديد سكة قضيب من جزء5أمتار لھا العملي السن سمك ويصل3مم الوسطي المنطقة:وقضبان المفتاح منحنيالجنب التقاطع منطقة:والمعوجات التقاطع جناح
3.
11/11/2015 3 اﻻﺑﺮة ﻣﻨﻄﻘﺔ عجال توجھان
متغير مقطع ذواتي ابرتين من االبرة منطقة تتألفت المستق الخط الي أو الجانبي الخط الي اما القطاريم جالمفتاح تدوير ھازيقض بواسطة مقدمتيھما عند االبرتين صليبوالذي االبرت احدي تالصق بحيث بينھما ثابتة مسافة علي يحافظالقضيب ين كع فدو تسمي محددة بمسافة الثانية االبرة وتبتعد األساسياالبرة ب اﻻﺑﺮة ﻣﻨﻄﻘﺔ االبرة كعب فدويعرفك عند االبرة سير حافة بين المسافة بأنهعبھا الجنب لقضيب السير وحافة طلي يتمالفلنكات علي المثبتة المعدنية الوسائدا أو بالزيتلشحملسھولة األفقية االبرتين حركة المقابل المفتاح:القط دخل اذا المقابل بالمفتاح المفتاح يسميعلي ار االبرة سن جھة من المفتاح المساير المفتاح:ج من المفتاح علي القطار دخل اذا مسايرا يسميھة التقاطع ال االنسان يمين علي الفرعي الخط كان اذا يمينا المفتاح ويسميعند واقف للتقاطع ناظرا وھو االبرة سن الواق االنسان يسار علي الفرعي الخط كان اذا شماال يسمي بينماعند ف االبرة سن
4.
11/11/2015 4 اﻟﺘﻘﺎﻃﻊ ﻣﻨﻄﻘﺔ التقاطع جناح: التقاطع
جناحھوال عند القطار عجالت لحمل يستخدم الذي الجناحمرور التقاطع علي المعوجات: المعوجاتھيحوالي طوله األطراف معوج حديد سكة قضيب من جزء 3التقاط علي المرور أثناء القطار عجالت لتوجيه يستخدم أمتارعات اﳌﻔﺘﺎح ﺗﺮﻣﻴﺰ زاويته ظل بقيمة المفتاح ماركة عن يعبر ماركة مفتاح المثال سبيل علي1⁄10زاوية أو الميل زاوية ظل أن تعني التقاطع)α(تساوي0.10 است يتم العالم ففي القطار سرعة علي تعتمد الميل زاوية درجةخدام1⁄22 و1⁄45و1⁄65يستخدم بينما السريعة الخطوط في1⁄10و1⁄12في و العادية الخطوط1⁄8الفرعية الخطوط في المفتاح نوع عن يعبر مختصرا خاصا رمزا مفتاح لكل يعطي له الھندسية والخصائص)القطر نصف,الميل,التفرع جھة( القضبان كنوع االنشائية والخصائص المثال سبيل عليRz S49‐300‐1:9ومن بسيط نوعه مفتاح علي تدل وزن القضبان49كجم ⁄القطر ونصف طولي متر300وظل متر الميل زاوية1⁄9
5.
11/11/2015 5 اﻟﺘﺤﻮﻳﻠﺔ المفاتيح من زوج
عن عبارة)مستقيم وجزء متقابلين مفتاحين(تصل لكي لسكة سكة من وينتقل متوازيين خطين بينبالشكل كما اﻟﺘﺨﻄﻴﺔ التخطيةتستخدمواح مستوي في بعضھما مع خطين تقاطع عندوعندما د اآلخر عن الخطين أحد لتفريع حاجة ھناك تكون ال و حادة زاوية علي أو بالشكل كما متعامد لتقاطع التخطية تكون قدتكون حرف شكل علي فيھا المعوجاتV
6.
11/11/2015 6 اﳌﻘﺺ أ والتخطية التحويلة
السابقين النوعين من كال تداخل عن عبارةأنه ي متوازي لخطين تخطية بينھما متقاطعتين تحويلتين عن عبارةكما ين بالشكل اﳌﻔﺼﻠﺔ متقاطعي سكتين بين القطري الجزء في يوضع منحني قضيبتسمح لكي ن بالشكل كما األخري االتجاھات في بالحركة مفرد المفصلة تكون قد)بابرتين واحد منحني قضيب(مزدوج أوة )بـثما منحنية قضبان أربع أو ابر بـأربع منحنيين قضيبينكما ابر ني بالشكل مزدوجة مفصلة
7.
11/11/2015 7 اﻟﻤﻔﺘﺎح ﻃﻮل يتمبالشكل كما
األفقي علي مسقطا الطول حساب المفتاح طول=ط1+ل ط1:األفقي علي مسقطا االبرة طول ل:المنحني قبل المستقيم والجزء المفتاح منحني طول اﻟﻤﻔﺘﺎح ﻃﻮل ط األفقي علي مسقطا االبرة طول1يتمالتالي الشكل من حسابھا ط1=جتا طβ ط:بـ قيمتھا وتتراوح االبرة طول5مترا β:االبرة سن زاوية=جا-1))ف-ت ⁄ (ط( ف:من قيمتھا وتتراوح االبرة كعب فدو ھي160-180مم ت:بـ ويفرض العملي االبرة سن سمك ھو3مم
8.
11/11/2015 8 اﻟﻤﻔﺘﺎح ﻃﻮل المفتاح منحني
طول حساب ويتم+التقاطع قبل المستقيم الجزء)ل(ال منتالي: ل=ر)جاα-جاβ+ (جتا جـα ر:المفتاح منحني قطر نصف) =س-ف-جا جـα) ⁄ (جتاβ-جتاα( α:التقاطع زاوية ھي=ظا-1 )⁄101(المفتاح ماركة كانت اذا⁄101 جـ:من قيمته وتتراوح التقاطع قبل المستقيم الجزء طول1.5-2.5متر س:بالمتر السكة اتساع ھو ف:بالمتر االبرة كعب فدو ن=11.8xس2 ⁄ر– 153xع 11.8xس2 ⁄ر=153xع المر العجلة قيمة بمعلومية للسير سرعة أقصي اليجاد المعادلة ھذه تستخدمكزية الخارجية بتط مسموح غير ألنه الصفر تساوي البطن عن الظھر ارتفاع قيمة أن حيثبيق المفاتيح منحنيات علي البطن عن الظھر ارتفاعات. مثال:- ط أن علم اذا لتفريعة والسرعة األفقي علي مسقطة المفتاح طول احسبول االبرة5كعبھا وفدو متر160التقاطع قبل المستقيم الجزء وطول مم2متر المفتاح وزاوية1⁄10. االجابة:- β=جا-1 ))0.16 ‐ 0.003 ⁄ (5= (0.031=1.8° ط1=5*جتا1.8=4.998متر α=ظا-1)0.1= (0.0997=5.71° س بفرض=1.435متر ر) =1.435-0.16-2*جا5.71() ⁄جتا1.8-جتا5.71(=240.7 متر
9.
11/11/2015 9 ل=240.7) *جا5.71-جا1.8(+2*جتا5.71=18.4متر المفتاح طول=4.998+18.4=23.4متر 11.8xس2 ⁄ر=153xع الحرجة
العجلة بفرض=0.65 فان س=45كم ⁄ساعة ﻳﻌﺔﺮاﻟﺘﻔ ﻃﻮل ب ب=المفتاح طول–)س(/2ظتا)α/2( التفريعة طول=2*ب) +بين الصافية المسافة المتوازيين الخطينcL&cL*ظتاα(
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