Department of Technical Education Andhra Pradesh Name Designation

Department of Technical Education Andhra Pradesh Name Designation Branch Institute Year/Semester Subject Code Topic Duration Sub Topic Teaching Aids : M. Chandra Sekhar Reddy : Sr. Lecturer : Mining Engineering : Govt. Polytechnic. Gudur. Nellore. Dt. : I year : Elements of Mining : MNG 105 : Shaft sinking : 50 Minutes : Revision on Equipment. Surface/additional : PPT, Animations, Photographs Revised by : M. Chandra Sekhar Reddy, Gudur 9 MNG 105. 178 1

Objectives On completion of this period, you would be able to • Know the surface plant and equipment • State the required for lining 9 MNG 105. 178 2

Recap • Under what condition brick lining is adopted ? • For ordinarily compact and moderately wet strata 9 MNG 105. 178 3

Recap • What is the supporting device used for brick lining ? • Walling curb 9 MNG 105. 178 4

Recap • The starting point of a vertical shaft at the ground surface is called Collar or shaft collar 9 MNG 105. 178 5

Surface Equipment Required for Shaft Sinking • • • Winding engine diesel / electrical / steam Head gear structure Double drum winch Jack hammer drill Compressor for jack hammer drill Fan – 300 m 3/min. capacity 9 MNG 105. 178 6

Shaft Head Gear 9 MNG 105. 178 7

Surface Equipment • Folding doors • Shaft centering arrangements • Signaling arrangements • Arrangements for disposal of debris • Lamp room and workshop 9 MNG 105. 178 8

Rider • Rider prevents undue swinging of the bucket during its travel in the sinking shaft • Runs on the ropes supporting the walling scaffold and guides the bucket during its travel 9 MNG 105. 178 9

Functioning of Rider • The rider cone is so constructed that detaching hook and rope cappel can pass freely through it • When bucket has to be lowered below the walling scaffold, the rider rests on the cappel of the scaffold ropes • Ropes pass down through the rider cone • Guided by a loose guide sheave called spider 9 MNG 105. 178 10

Walling Scaffold It is a platform used for the construction of brick wall • This consists of a frame of Sal wood • 0. 3 m x 0. 3 m square members covered with stout Sal planks • It has an opening 2 m x 2 m square for passage of sinking bucket 9 MNG 105. 178 11

Walling Scaffold Walling scaffold 9 MNG 105. 178 12

Walling Scaffold • The scaffold is suspended by chains from two ropes hanging in the shaft • One rope on each side of shaft lowered / raised by double drum winch • Scaffold dia is slightly less than the finished dia of the shaft 9 MNG 105. 178 13

Walling Scaffold • Four sliding bolts are used to keep the platform steady • About 1. 3 m of walling is completed from one position of he scaffold • Walling scaffold have been designed , which allow sinking operations at same time 9 MNG 105. 178 14

Summary We have discussed about • Surface equipment • Use of Rider • Walling scaffold and its purpose 9 MNG 105. 178 15

Quiz 1. Rider used in sinking shaft is for a. Removal of debris b. Guide to the wall c. Preventing swing of bucket d. Plat form for wall 9 MNG 105. 178 16

Quiz 2. Walling scaffold made steady while constructing wall by a. b. c. d. Suspending with ropes Rider support Sliding bolts Folding doors 9 MNG 105. 178 17

Frequently Asked Questions 1) Sketch and describe a. Rider b. Walling scaffold 2) List the surface equipment required for sinking a shaft. 9 MNG 105. 178 18