High Speed Sinking by Mechanized Sinking Method
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Transcript of High Speed Sinking by Mechanized Sinking Method
HIGH SPEED SINKING BY MECHANIZED SINKING METHOD
GROUP : A-24th SEM
MINING ENGINEERING
The mechanisation of mine development is becoming increasingly important in the mines with increased emphasis on safe and efficient mining. While the process technology of boring machines deployed in mechanical tunneling and their auxiliary equipment have advanced rapidly, the methods used in today's shaft construction are still comparatively conventional.
INTRODUCTION
To achieve high sinking rate in deep underground excavationsDrilling upto higher depth coping with different hydrogeological conditionsReducing cost
OBJECTIVES :-
Factors responsible for the low degree of mechanization
Presence of groundwater
Geology
Depth
Construction lining/blind-enlargement
Area of the cross–section
Types of sinking operations
Sinking Operations
Series system
Parallel system
Simultaneous system
Series system :sinking with non-simultaneous face advancing and erecting of permanent lining.
Parallel system : sinking with simultaneous face advancing and permanent lining erection in certain distances behind the face.
Simultaneous system : advancing the face with simultaneous and erection in the same shaft section.
Sinking operation:
VSM series:
MECHANISED SHAFT SINKING MACHINE
Developed by HERRENKNECHT AG in Kuwait-2003
Best for water bearing soil Generally for shallow shaft( can also be used
for deep shaft) Based on technology of roadheader boom
and cutting drum Machine can also be operated remotely in
water submerged condition
VSM (Vertical Shaft machine)
It comprises of two main structures:- Upper support / thrust frame.
This is made up of six main pieces when fully dismantled, it is normally broken down into two halves which can be transported on a low loader flat black lorry.
Rotary Cutting Unit.This comprises a circular frame which hydraulically clamps to the leading section of the cason, this supports an inner rotary ring which carries the cutting boom. The inner ring is hydraulically rotated through 360 degrees by two high torque slow speed motors. The ground is excavated by a Dosco hydraulic axial boom rated at 110 kW, the boom movements being automatically computer controlled.
Parts of VSM and working
Model specificationsVSM 8000 Can work upto 28 mtr
depth In a rock compressive
strength of 60 MPa Shaft dia. : 6m and 8m
VSM 2500 Can work to a depth of 100 m
In a rock of 85 Mpa strength
VSM 9000 Shaft depth : 23 m Internal dia. : 9 m
VSM 7700 Shaft depth 85 m Internal dia. : 7.7m
VSM 9600 Shaft depth: 160 m For very hard rock
Models of VSM:
VSM
VSM 9000
VSM 9600
VSM 7700
Developed by Herrenknecht AG in collaboration with Rio Tinto
for the mechanised excavation of deep vertical blind shafts
In hard rock conditions (125MPa rock strength)
Can work upto 500 m (experimental)
based on the use of a rotating cutting wheel excavating
SHAFT BORING SYSTEM(SBS)
The excavation process is divided into two steps: • trench excavation to a depth of one stroke
with the cutting wheel rotating around its horizontal axis and being pushed downward in the shaft direction
• excavation of the entire bench (face) area by slewing the rotating cutting wheel 180° around the shaft vertical axis.
SBS excavation process
The cutting wheel has a diameter thatequals the excavation diameter of the shaft (10–12 m). It is equipped with disc cutters at the periphery and the side areas. The frontloading disc cutters have a diameter of 48 cm with a narrow cutter ring design. The cutting paths of the disc cutters are circular.
Working operations in SBS
Mucking is primarily done by two ways : By fore bore hole Hydraulically through pipe lines
The shaft sinking machine has steel ropes attaching it to the sinking unit which is located on the surface.
Mucking
Mechanized mucking
• Time and effort consuming job.• Depends upon the rock fragmentation• Most efficient in medium sized fragmentation. There are several types of muckers like:i. Scrappersii. Overshot loaders on caterpillariii. Cactus grabiv. Cryderman muckers
They can be electrically ,pneumatically or hydraulically driven.
Mucking units
www.herrenknecht.comhttp://www.microtunel.com/71_vsm.htmArticle on “ Shaft sinking equipment” on the
site http://daz24.depdf documents from random sites.
References :-