Certificados Bursátiles

Construction Glossary

The following terms used in Section 5 - Trenchless Technology, are defined below.

AUGUR BORING

A technique for forming a bore from a drive shaft to a reception shaft, by means of a rotating cutting head. Spoil is removed back to the drive shaft by helically wound auger flights rotating in a steel casing. The equipment may have limited steering capability.

AUGUR TBM

A type of tunnel boring machine in which the excavated soil is removed to the drive shaft by auger flights passing through the product pipeline pushed in behind the TBM.

CUTTER HEAD

Any tool or system of tools on a common support which excavates at the face of a bore. Usually applies to mechanical methods of excavation. DIRECTIONAL DRILLING

A steerable system for the installation of pipes and cables in a shallow arc using a surface launched drilling rig.

DRILLING FLUID / MUD

A mixture of water and bentonite or polymer continuously pumped to the cutting head to facilitate the removal of cuttings, stabilise the borehole, cool the head and lubricate the installation of the product

pipe. In suitable ground conditions water alone may be used.

DRIVE/ENTRY SHAFT OR PIT

Excavation from which trenchless technology equipment is launched for the installation or renovation of a pipeline, conduit or cable. May incorporate a thrust wall to spread reaction loads to the ground.

EARTH PRESSURE BALANCE (EPB) MACHINE Type of Microtunnelling or tunnelling machine in which mechanical pressure is applied to the material at the face and controlled to provide the correct counter-balance to earth pressures in order to prevent heave or subsidence.

ENTRY/EXIT ANGLE

In a horizontal directional drilling/guided boring system, the angle to the ground surface at which the drill string enters and exits in forming the pilot bore.

FLUID-ASSISTED BORING/DRILLING

A type of guided boring technique using a combination of mechanical drilling and pressurised fluid jets to provide the soil cutting action.

GROUTING

Filling of the annular space between the carrier pipe and the new product pipe. Grouting is also used to fill the space around laterals and between the new pipe and manholes. Other uses of grouting are for localised repairs of defective pipes, ground improvements prior to excavation during new installations and the filling of voids around existing carrier pipe.

INTERJACK PIPES

Pipes specially designed for use with an intermediate jacking station.

INTERMEDIATE JACKING STATION (IJS) A fabricated steel shield incorporating hydraulic jacks designed to operate between interjack pipes to provide incremental thrust on long drives.

JACKING PIPES

Pipes designed to be installed using pipe jacking techniques.

JACKING SHIELD

A fabricated steel cylinder from within which the excavation is carried out either by hand or machine. Incorporated within the shield are facilities to allow it to be adjusted to control line and level.

JET CUTTING

A type of guided boring technique using pressurised fluid jets to provide the soil cutting action.

LAUNCH PIT

As for drive shaft but more usually associated with “launching” an impact moling tool.

LEAD PIPE

The leading pipe manufactured to fit the rear of the jacking shield and over which the trailing end of the shield is fitted.

MEASUREMENT WHILE DRILLING (MWD) Borehole survey instrumentation that provides continuous information simultaneously with drilling operations, usually transmitting to a display at or near the drilling rig.

MICROTUNNELLING

Steerable remote control pipe jacking to install pipes of internal diameter less than that permissible for man-entry (i.e. <1000mm).

MIDI-RIG

Steerable surface-launched drilling equipment for the installation of pipes, conduits and cables. Applied to intermediate sized drilling rigs used as either a small directional drilling machine, or a large guided boring machine. Tracking of the drill string may be achieved by either a downhole survey tool or a locator.

MAN-ENTRY

Description of any tunnelling technology process, which requires an operative to enter a pipe, duct or bore. The minimum size for which this is

permissible is generally defined by national health and safety legislation (e.g. larger than 1000mm diameter in the UK).

NEW INSTALLATION

Methods by which a new pipeline is constructed. PIPE JACKING

A technique by which the pipes are pushed through the ground behind a tunnelling shield using hydraulic jacks reacting against a thrust wall in a jacking/launch pit.

RECEPTION/EXIT/TARGET SHAFT OR PIT Excavation into which trenchless technology equipment is driven and recovered following the installation or renovation of the product pipe, conduit or cable.

SLEEVE PIPE

A pipe installed as external protection to a product pipe.

SLURRY TBM

A type of Microtunnelling machine in which soil is turned to slurry and is used to counterbalance ground water pressure to stabilise the face, before being pumped to the surface.

SURVEY TOOLS

Downhole equipment and instruments used to determine the position of a bore in directional drilling or site investigation.

TUNNEL BORING MACHINE

A full-face circular mechanical shield machine, usually of man-entry diameter, steerable, and with a rotary cutting head. For pipe installation, it leads a string of jacked pipes. It may be controlled from within the shield or remotely.

State of Qatar -Public Works Authority Drainage Affairs

6

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State of Qatar -Public Works Authority Drainage Affairs

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