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Singapore - Trenchless International

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dRILLING eqUIPMeNt<br />

October 2010 - <strong>Trenchless</strong> <strong>International</strong><br />

52<br />

hdd gets bigger<br />

Completing the model range of the S Series, the new Terra-Jet 8522 S is the largest<br />

HDD machine ever built by Terra AG and was exhibited successfully at BAUMA, Munich.<br />

The machine is characterised by high power and drilling fluid volume.<br />

all you need in the driller's seat<br />

the Premium model of the terra-Jet<br />

8522 s is equipped with a comfortable<br />

driver’s cabin, which sets new standards.<br />

the cabin has all-round tinted glazing,<br />

with the machine side being glazed in a<br />

single uninterrupted panel. this allows the<br />

operator to see every detail of the drilling<br />

machine.<br />

Large windscreen wipers with jets clean<br />

the front and right panels. Additionally the<br />

drilling fluid pressure inside the drill rods<br />

is automatically released just before each<br />

drill rod change, preventing bentonite from<br />

being splashed onto the glazing.<br />

the on-board computer with a large<br />

10.4 inch touch screen displays the vital<br />

information needed at any instance. It<br />

updates and saves all relevant machine<br />

data every two seconds, updating the<br />

operator on the essential drilling elements.<br />

this data is essential for efficient service<br />

diagnostics.<br />

Additionally a bore log can be printed<br />

for each bore as regulated in the German<br />

specification DVGW 321.<br />

Sitting comfortably<br />

the operator sits in a comfortable operator’s<br />

seat, which can be adjusted to suit the<br />

body shape and weight of the operator.<br />

the operator’s cab is wide, allowing the<br />

seat to rotate 180 degrees. the operator<br />

can drill looking in the drilling direction, or<br />

can rotate the seat to be at right angles<br />

to the drill and observe every detail of the<br />

drilling machine.<br />

Machine technology<br />

the terra-Jet 8522 s may drill directional<br />

bores up to 400 m long and 1,000 mm in<br />

diameter depending on ground conditions.<br />

torque and pullback force are produced<br />

by separate hydraulic circuits allowing the<br />

maximum torque of 8,500 Nm and the<br />

maximum pullback force of 220 kN to be<br />

used simultaneously under full load.<br />

Separate bentonite chamber<br />

the drilling fluid volume is 400 litre per<br />

minute. the mixing system which mixes<br />

the bentonite into the drilling fluid via<br />

an injector (venture hopper) is on board<br />

the HDD machine. this patented system<br />

removes the need for an extra mixing system<br />

and a second engine.<br />

the bentonite high pressure pump and<br />

the mixing pump are placed in a separate<br />

chamber between the driver’s cabin and<br />

engine chamber. this aesthetically pleasing<br />

solution ensures that no bentonite<br />

touches hydraulic components.<br />

automatic drilling<br />

the machine is equipped with a second<br />

generation automatic drilling and backreaming<br />

system (ADBs). this patented<br />

system automatically adjusts the working<br />

speed of the drill to suite the ground<br />

conditions.<br />

In soft ground the drill operates at maximum<br />

speed, in hard ground slowly. this<br />

allows the operator to operate the drill at<br />

maximum efficiency in a controlled and<br />

relaxed manner and prevents the drill rods<br />

and drilling tools from being overloaded.<br />

During the pilot bore the ADBs controls the<br />

thrust force. If the drill head hits an unexpected<br />

obstacle, the ADBs stops the drilling<br />

speed immediately and drills very slowly<br />

through the obstacle – all automatically!<br />

Another new feature is the automatic drill<br />

rod greasing function, which is undertaken<br />

during each drill rod change by an electrically<br />

driven grease press attached to the<br />

driving saddle.<br />

New operator’s concept<br />

the drill operator drives and operates the<br />

HDD machine using the two multifunctional<br />

joysticks installed in the left and right armrests<br />

of the operator’s seat. Driving using<br />

the joysticks allows instantaneous control<br />

and smooth movement of the terra-Jet.<br />

Promoting trenchless in Ukraine<br />

The Ukraine Association for<br />

Modern <strong>Trenchless</strong> Technology<br />

held a very successful event in<br />

Odessa on 10 September.<br />

The caLL fOr abstracts is now open.<br />

Prospective presenters are invited to submit<br />

a 300-word abstract in English outlining the<br />

scope of their paper and the principal points<br />

of benefit to the trenchless industry.<br />

the abstracts must be submitted to<br />

info@istt.com by 15 December 2010.<br />

chaIrMaN VIcTOr PrOkOPchuck<br />

and EsC member Olga Martinyuk welcomed<br />

Istt Chairman Dec Downey who<br />

gave a keynote address. some 93 delegates<br />

including 15–20 student members listened<br />

avidly to 24 excellent papers, primarily on<br />

new construction by horizontal directional<br />

drilling including contributions from local<br />

distributors for Vermeer, Ditchwitch and DCI.<br />

the merits of locally produced and<br />

imported bentonite additive and mud materials<br />

were enthusiastically discussed and<br />

No-dig Berlin<br />

latest news!<br />

the event culminated with a buffet for all<br />

and a dinner for the Ukraine Association<br />

Board where the discussion continued the<br />

lively debate.<br />

Dr Downey commented that it was good<br />

to see such a young society functioning well<br />

and encouraging healthy debate and he<br />

hoped that in future years there would be<br />

contributions from international contributors<br />

in the rehabilitation sector. On the second<br />

day delegates toured local manufacturing<br />

facilities, concluding their get together.<br />

The 2011 <strong>International</strong> No-Dig will be held in conjunction with<br />

WASSER Berlin <strong>International</strong> 2011, on 2–5 May at Exhibition<br />

Grounds Messe Berlin.<br />

Please visit the following website for more<br />

information: www.nodigberlin2011.com<br />

Furthermore the German society for<br />

trenchless technology (Gstt) has<br />

developed a special offer for Corporate<br />

Members of Affiliated societies to exhibit<br />

at No-Dig Berlin 2011.<br />

turkey joins the Istt<br />

The ISTT has recently welcomed the Turkish Society to the organisation.<br />

yaSIN TOruN, chaIrMaN of the newly<br />

formed turkish society for Infrastructure<br />

and trenchless technologies and Dec<br />

Downey Istt Chairman signed an affiliation<br />

agreement in a Istt registered<br />

office in Belgrave square, London<br />

on 21 september 2010 (pictured). Also<br />

attending the signing was Prof Dr Fevzi<br />

Yilmaz of sakarya University, Norman<br />

Howell, <strong>International</strong> Director UKstt<br />

and Ahmet Gulec, Vice Chairman of the<br />

turkish society.<br />

Corporate Members are entitled to exhibit<br />

at the “Pavilion Pipeline Construction”,<br />

which is much cheaper than exhibiting<br />

alone in the standard area.<br />

For more information please contact<br />

Ms Dagmar Eichhorn from Gstt at<br />

eichhorn@gstt.de<br />

Istt News<br />

October 2010 - <strong>Trenchless</strong> <strong>International</strong> 53

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