Deep screening in single rail section, SWR & LWR,

Question - Describe procedure of Deep screening in single rail section, SWR & LWR, pre caution to be observed at site also to be mentioned.

Ans. Due to presence of bad formation abrasion and attrition of ballast, impact loads excessive rainfall, ballast gets chocked up and track drainage is impaired. At this stage entire ballast under sleeper and crib right up to formation level/sub ballast level is removed to improve drainage and running quality of tack, the process is called Deep screening. It can be carried out at following locations:

Short notes For Civil Engineer LDCE & Other Exam (P Way)

  Write short notes

(a) Mean annual rail temperature 

Ans (a): Mean Rail temperature- Denoted at tm for a section, it is the average of the maximum and minimum rail temperature recorded for the section. tm= (tmax +tmin ) / 2 

(b)Stress free temperature 

Ans (b): Stress free temperature- Denoted as to , it is the rail temperature of which the rail is free of thermal stress.

(c) Breathing length in a LWR 

Ans (c.): Breathing length in LWR- Breathing length is that length at each end of LWR/CWR, which is subjected to expansion/Contraction on account of temperature variations. 

Distressed bridges and schedule of inspection by official

Distressed bridges and schedule of inspection by official.

Definition of distressed bridge:- A distressed bridge is one which shows some physical deterioration of its physical condition, indicating the need for rehabilitation through special repairs strengthening or rebuilding (including replacement of griders).

Classification of distressed bridges

Category - i: Those requiring rehabilitation to be done immediately, say within a year’s time. Category-ii: those requiring to be kept under observation and to be taken up for rehabilitation on a programme basis. Signs of distress for Group I bridges:

Q. & Ans - What are the main cause of crushing of PRC sleeper in washable aprons and what are the remedial measures?

Q.  What are the main cause of crushing of PRC sleeper in washable aprons and what are the remedial measures?

Ans - The washable aprons are constructed on the concrete raft. The PRC sleepers placed on the raft and after palcing of sleeper the crib is casted one bitumen sheet also provided under the sleepers at both ends for facilitating the elastic medium between sleeper and raft. 

Now during casting of crib the concrete as well as cement sullary flows under the middle of sleeper which give the rigid support to the sleeper resulting to this the sleeper becomes centre rigid and ends on elastic support due to this uneven base the sleeper sheared while wheel load comes on the sleeper . 

Procedure of distressing with rail tensor in LWR & CWR territory

Q - Describe in details procedure for Procedure of distressing with rail tensor in LWR & CWR territory. 

Ans - Distressing of LWR/ CWR shall be done whenever required as per condition and behavior of LWR/ CWR. But in any case it shall be done at least once in 5 years as per CE circular.

Distressing is to be done when – Abnormal behavior of LWR/ CWR whenever gets manifested in one or more of the following, distressing shall be undertaken as per procedure. 

Inspection and maintenance of Track on Approaches of Bridges

 Inspection and maintenance of Track on Approaches of Bridges :- 

(a) For all Bridges- 

(1) On the bridge approaches, sleepers with arrangements for fixing guard rail should be provided for provision of guard as per Para 275 above.

(2) Full complement of track fitting at bridge approaches up to 100 metres should be provide to maintain required track geometry and effort should be made to immediately recoup deficiency noticed, if any. 

ट्रैक मशीन (Track Machine)

" यह पीले रंग की बड़ी मशीन होती है जिसके लिए ब्लाक एवं डीजल की व्यवस्था करनी पड़ती है और आउटपुट पर मुख्यालय द्वारा नजर रखी जाती है "

"ट्रैक मशीन ट्रैक इंजीनियर के जीवन का अभिन्न हिस्सा है आप इंके बिना कुछ नही है इसलिए इनके बारे में जानो, इसके लिए देखभाल करो और इससे आपको प्रेम हो जाएगा

ट्रैक मशीन की आवश्यकता :-

आधुनिक ट्रैक को आदमियों द्वारा न तो डाला जा सकता है और न अनुरक्षण किया जा सकता है मशीन अनुरक्षण 60 के दशक में प्रारंभ कर लिया गया था ट्रैक मशीनों को मुख्यत: दो श्रेणी में रखा गया है-

Short Note on Soil Consistency

SOIL CONSISTENCY

The property of soil which is evident by its resistance to flow is called soil consistency.

Consistency helps to understand the degree of cohesion between various soil particles. A fine grained soil thus remain normally in any one of the flowing states:

Short Notes on Imprest Store, Charged of store, Surplus Store

Imprest Store, Charged of store & Surplus Store

 IMPREST STORES:-

The imprest with every subordinate should be fixed by the head of department. The scale of imprest sanctioned for each subordinate should not be increased or decreased except by the authority who originally fixed the scale. Material issued from in present stock should be recouped as soon after the issues as possible. The subordinate concerned may place requisitions for the recoupment of imprest stores direct on the authorized stores Depot. No transfer of stores between imprest holders should be permitted except when stores are immediately required in a particular area in an emergency and are not available at the time with the imprest holder of that area.

Short Note On Thermit Welding quality control

Thermit Welding & its quality control: -

A fish plated joint has been a necessary evil in the railway track right from beginning of railway. To overcome the various problems posed by the fish plated joints and reduced the maintenance cost the need for welding of rail ends was felt. Joining of two rails end by the application of heat is called welding. Among the various tetchiness of welding the AT welding is used now days for scattered and spot welding.