Archivi categoria: HDD

Horizontal Directional Drilling

SEWER MAINS AND HOUSE CONNECTIONS BY HDD

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Client: SE.T.A. Srl (today ETRA Spa) – Italy

Year: 2003-2004

What I did: I made the detailed design of the installation of pressure and gravity sewer pipes by directional drilling; I carried on the training of the technical personnel (engineers, supervisors and operators). I developed a dedicated and complete HDD pit launched installation system for the connection of houses to the sewer mains. I also wrote two technical standards: the first for preliminary underground mapping and the second for the construction of house connections by using pit launched HDD machines.

SEWER MAINS AND HOUSE CONNECTIONS BY HDD
longitudinal section of an HDD installation.
longitudinal section of an HDD installation.
longitudinal section of an HDD installation.
longitudinal section of an HDD installation.
longitudinal section of an HDD installation.
longitudinal section of an HDD installation.
plan view of an HDD installation.
plan view of an HDD installation.
plan view of an HDD installation.
Detail of the connection between a concrete shaft and the newly installed culvert.
Pit launched HDD system for the connection of houses to the sewer main.

RD07-13

click on the image to see the index of the standard norm (language: Italian)

RD07-14

click on the image to see the index of the standard norm (language: Italian)

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HDD IN CHALLENGING ROCK CONDITIONS AND COMPENSATION GROUTING BY HDD

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Client: SERREMAR Srl – Italy

Year: 2006-2008

What I did: I made the detailed design of the installation of underground pipes, ranging from 100 mm (4″) to 500 mm (20″), by Horizontal Directional Drilling, in hard to very hard rock; HDD at sharp radius in rock and application of HDD to pre-tunneling compensation grouting and directional underground injections for insulation and treatment.

HDD IN CHALLENGING ROCK CONDITIONS AND COMPENSATION GROUTING BY HDD
Aulla (Italy) - a rocky hill to be crossed
Aulla (Italy) - the job site at the start point - the rig
Aulla (Italy) - the start point - drilling through abrasive sandstone.
Marina del Cantone (Italy) - tracking diagram of the pilot bore.
Marina del Cantone (Italy) - the job site at the start point.
Marina del Cantone (Italy) - Guiding the drilling head.
Marina del Cantone (Italy) - A conventional rig equipped with a directional down-the-hole assembly.
Marina del Cantone (Italy) - a rock reamer ready to be inserted into the pilot bore.
Arenzano (Italy) - drilling path (longitudinal section).
Arenzano (Italy) - plan view of the installation.
Arenzano (Italy) - the reamed borehole, ready for the pullback of the product pipe.
Prissiano (Italy) - the job site at the start point.
Prissiano (Italy) - the DTH directional water powered hammer.
Prissiano (Italy) - a rock reamer ready to ream the pilot bore.
Prissiano (Italy) - The assembled pipe ready to be pulled back into the reamed borehole.
Sevilla (Spain) - feasibility study of the use of HDD for a pre-tunneling compensation grouting
Sevilla (Spain) - feasibility study of the use of HDD for a pre-tunneling compensation grouting
Sevilla (Spain) - feasibility study of the use of HDD for a pre-tunneling compensation grouting
Bologna (Italy) - Design of the compensation grouting by HDD, before the passage of two TBMs (High Speed Train)

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INSTALLATION IN VERY HARD AND ABRASIVE ROCK OF A DN700 CAST IRON WATER PRESSURE PIPE

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Client: KLAPFER BAU Srl – SANTATO MARCO TRIVELLAZIONI – Italy

Year: 2011

What I did: I made the detailed design and supervision of the installation by microtunneling and HDD, in very hard and abrasive quartzite-diorite rock, of a DN700 mm (28″) cast iron water pressure pipe – the work was split in two section, each one 80 m (265 ft) long. The borehole diameter was 800 mm (32″). A very challenging job for the extreme hardness and abrasivity of the rock. The water pressure pipe is part of a mini hydro-power plant in the Alps (Italy).

INSTALLATION IN VERY HARD AND ABRASIVE ROCK OF A DN700 CAST IRON WATER PRESSURE PIPE
The rig while drilling the pilot bore.
Down-the-hole air hammer ready to drill the pilot bore.
The double stage DN800 -600 back-reamer used for the final reaming
The borehole after intermediate reaming.
The borehole after the final reaming.
The auger boring machine (ABM).
A 32
The borehole after retracting the SBU, at 40 m of bore length.
Close-up of the two-rows TCI disk cutter used to complete the bore.
The borehole after retracting the SBU, at 62 m of bore length.
The borehole after retracting the SBU, at 62 m of bore length.

 

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PROJECT OF A DN900 GAS PIPELINE INSTALLATION BY HDD

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Client: GHIZZONI Spa – Italy

Year: 2007

What I did: I made the design of 6 crossings by HDD for the installation of a DN900 gas pipeline, for a total length of 3.536 m (11.600 ft).

PROJECT OF A DN900 GAS PIPELINE INSTALLATION BY HDD
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 484,0 m long.
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 503,0 m long.
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 533,0 m long.
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 686,0 m long.
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 686,0 m long.
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 464,0 m long.

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DETAILED DESIGN OF A SEWER MAIN INSTALLATION BY HDD AND TRAINING OF THE ENGINEERING PERSONNEL

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Client: TEA Spa – Italy

Year: 2011

What I did: I made the detailed design of o channel crossing, by HDD, for the installation of a pressure sewer main for a total length of 320 m (1.000 ft); this project was part of a specialized training program that I carried out with the engineering personnel of the company and that led to the completion of the project of installation of the whole sewer main, entirely made by HDD, for a total length of 5,9 km (3,7 miles), divided in 21 HDD crossings.

DETAILED DESIGN OF A SEWER MAIN INSTALLATION BY HDD AND TRAINING OF THE ENGINEERING PERSONNEL
Plan view and longitudinal section of an HDD crossing - DN900 steel pipe, 464,0 m long.
Longitudinal section
Job-site layout at the start point of the directional borehole.


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HDD IN DIFFICULT ALLUVIAL SOIL

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Client: IMET Spa – Italy

Year: 2007

What I did: detailed design and work direction of the installation of a DN450 HDPE drainage pipe along a curved drilling path with sharp bending radius in alluvial soil with polygenic boulders, for a total length of 180 m (590 ft) – Selva di Val Gardena, Italy.

HDD IN DIFFICULT ALLUVIAL SOIL
Longitudinal section and plan view and of the Selva di Valgardena project, for the installation of a DN315 HDPE sewer pipe along a curved drilling path in alluvial soil with polygenic boulders.
The drilling path.
Start point - the rig during the pilot bore stage.
Start point - the rig during the pilot bore stage.

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DESIGN OF THE CROSSING BY HDD OF A ROCKY HILL

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Client: Appennino Energia Srl – Italy

Year: 2009-2010

What I did: I made the design of the installation by HDD, in medium to hard and high abrasive sandstone, of a pressure water HDPE pipe, DN630 mm (25 in), for a total length of 530 m (1,740 ft) along an uphill drill path, for a mini hydro-power plant.

DESIGN OF THE CROSSING BY HDD OF A ROCKY HILL
Piastroso (Italy) - longitudinal section of the hill crossing.
Fractured sandstone
A sample of the seismic survey made before the detailed design.
Core sampling - part of the pre-design survey campaign.
Core sampling - part of the pre-design survey campaign.
Cross section of the borehole with the pipe to be installed inside.
Job-site layout at the exit point of the directional borehole.
Job-site layout at the start point of the directional borehole.

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HDD RIVER CROSSING WITH SHARP BENDING RADIUS IN VERY DIFFICULT SOIL CONDITIONS

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Client: EDIL IDRAULICA Sas – Italy

Year: 2011

What I did: I made the project management and the supervision of the installation, by HDD, of three HDPE DN 560 (22 in) pressure sewer pipes under the Foglia river, Pesaro, Italy. Three directional pilot bore, with an interaxis of just 1,5 m, along a drill path with a very sharp bending radius (70 m), were successfully drilled under the river bed, facing challenging soil conditions, with big boulders and blocks of stone in a matrix of silt and clay. Although the three pilot bores were perfectly completed, on the first alignment, after completed the first final reaming at 700 mm, the first pull-back failed due to the collapse of underground unstable big blocks of rock. Despite the prohibitive soil conditions we successfully completed the pullback of the two remaining product pipes, achieving a remarkable result in a very difficult HDD work.

HDD RIVER CROSSING WITH SHARP BENDING RADIUS IN VERY DIFFICULT SOIL CONDITIONS
Plan view of the installations.
Longitudinal section of the river crossing.
The pipes to be installed - DN560 PE100 pipe. Nominal diameter of the reamed borehole: 700 mm.
A complete set of preliminary survey were done before the detailed project - in the picture a 3D geoelectrical tomography.
Rock boulders in a matrix of silt and clay, represent a challenging soil condition for HDD.
The official panel at the job-site.
Creating a laser level for depth measuring while drilling.
Continuous mud control and prime drilling fluids were crucial to face so difficult soil conditions.
The HDD rig used to complete the job (Vermeer D50 - 50.000 lbs - 23t pullback force)
Starting a pilot bore.
Starting a pilot bore.
Guiding the drilling head.
Starting the last pilot bore.
The three drill strings laying underground.
Pre-reaming stage - reamer diameter 500 mm.
Final reaming stage - reamer diameter 700 mm.
The pullback stages were carried out during the night shifts to not interfere with traffic.
First product pipe during pullback
Pullback of the second product pipe during a night shift
Pullback of the second product pipe during a night shift
The end of the second pullback.
Starting the third reaming.
The end of the third pullback.
The unexpected presence of big blocks of rocks, along the drilling path, made the work extremely difficult causing the block of the first pullback - in the picture the attempt to clear the drill path of the rocky blocks.
The unexpected presence of big blocks of rocks, along the drilling path, made the work extremely difficult causing the block of the first pullback - in the picture the attempt to clear the drill path of the rocky blocks.
Although more than 20 blocks of rock (dimension ranging in the interval 0,6 - 1,2 m) were removed, the first pipe remained definitively stuck underground.
Although more than 20 blocks of rock (dimension ranging in the interval 0,6 - 1,2 m) were removed, the pipe remained definitively stuck underground.

 

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LANDFILLS INSULATION BY HDD

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Client: MC Scarl – Cooperativa MUCAFER Scpa – Italy

Year: 2010

What I did: I worked for the main contractor MC Scarl – Cooperativa MUCAFER Scpa, as the specialized advisor for the HDD operations in the insulation of two urban landfills, for the environmental securing of the area. In less than one year approximately 60 km (37 miles) – corresponding to more than 500 horizontal directional boreholes – were drilled through soft to hard limestone rock in order to carry out underground injections to create a bottom screen below the garbage level  (total value of the HDD installations: €14M). This was the biggest project of ever for a landfill insulation made by HDD. The specialized subcontractor for HDD and soil treatments was TREVI Spa.

LANDFILLS INSULATION BY HDD
Plan view of the CONTE DI TROIA landfill - more than 200 directional boreholes were drilled to construct the underground screen.
Plan view of the PARITI landfill - more than 300 directional boreholes were drilled to construct the underground screen.
Example of the longitudinal section of a directional borehole.
Example of the longitudinal section of a directional borehole.
General scheme of the boreholes geometry.
General scheme of the injection operation.
Example of a survey soil core.
Screenshot of the CCTV inspection of two survey boreholes.
A conventional drill rig equipped with a directional dow-the-hole assembly.
A rig during the directional drilling operation.
A mud motor ready to start a pilot bore
Multiple teams were performing directional drilling at the same time.

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R&D IN HDD AND DETAILED DESIGN OF LARGE RIVER CROSSINGS

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Client: FONDAZIONI SPECIALI Spa, Italy

Year: 2011-2012

What I did: I worked as the head of R&D of the HDD division, having the following charges:

  • feasibility studies for the application of HDD and microtunneling technologies
  • R&D for the use of HDD in compensation and jet grouting.
  • R&D for a non-conventional guidance system for HDD
  • R&D for hole supporting in up-hill directional drilling
  • organization and management of the mud laboratory.
  • training of engineers, supervisors and operators.

I also made the detailed design, performing the role of problem solver during the execution of large river crossing carried out by HDD for the installation of gas pipelines:

  • PO river, Italy, DN600 (24 in) for a total length of 1.300 m (4,300 ft)
  • Enza river, Italy, DN100 (4 in) for a total length of 1.200 m (4,000 ft) 
R&D IN HDD AND DETAILED DESIGN OF LARGE RIVER CROSSINGS
Enza River crossing, Italy - Pilot bore for the installation of a 4
PO River crossing, Italy - Pull-back stage of a 24
PO River crossing, Italy - End of the pull-back stage of a 24

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