interesting projects - g and e
TRANSCRIPT
1In this issue: Case History Interesting Projects New Product /
Application • TriAx Geogrid • Deckdrain with Woven
Geotextile • Mini Roll Geotextile for
Landscaping Technical Note European Union – Falling Rock Protection Kit Certification Opinion Column Sheet Membrane Seaming For Your Information • A Word from General
Manager • 35th Anniversary Recap Reader’s Response
September 2019. Issue No.32
Interesting Projects We have seen projects with very typical usage of geosynthetics and related products, some in unique applications. Here are several products that catch our attention and might be of interest to you.
CV/2013/08 - at Liantang / Heung Yuen Wai Boundary Crossing, BOSTD geocell is designed to retain 150 mm thick of planting soil on steep cut slope for vegetation establishment. [email protected].
At SENT Landfill – Bonar 185 l/m2/s high permeability woven geotextile is used as French drain drainage filter separation. The HF series allows up to a 400 l/m2/s water flow rate. ivan@g- and-e.com.
CV/2012/05 - at Lung Mei Bathing Beach, Maccaferri gabion is used to construct a 4 m high wing wall leading to an open drainage channel extended from the box culvert to the outfall. natural@g- and-e.com.
DC/2009/24 - at Harbour Area Treatment Scheme (HATS) Cyberport Port landing, ACE high strength woven geotextile is prefabricated into a 150 mm φ x 4 m tube in which grout is infilled to form a concrete joining pin to interlock vertical seawall blocks. ivan@g- and-e.com.
In a Tsuen Wan Private Development – Daehan Hori- drain, a 200 mm width x 9 mm thick prefabricated drainage composite is designed to dissipate water pressure in the basement structure. [email protected].
HY/2014/06, at Hiram Highway expansion, Maccaferri Macmat is used for slope erosion protection, the polyamide mat offers distinct fire-retardant characteristic. [email protected].
NE201501, at Lam Tin – TKO tunnel – Bonar woven geotextile is sent to Korea to fabricate into a hybrid silt curtain incorporating a widely accepted Bontec SG110/110 geotextile to an engineered design silt curtain. [email protected].
G and E Times
September 2019. Issue No.32
New Product / Application TriAx Geogrid Tensar introduces the concept of soft ground stabilization by confining and interlock granular to initiate lateral restraint using radial stiffness of triaxial geogrid, as opposed to tension membrane where high strength geosynthetics are sought to carry the loading by anchorage and friction.
site activity becomes more cost effective and efficient.
TriAx geogrid is developed under this principle. It is ideal for formation of temporary access, haul road and working platform. The geogrid can be laid on area with CBR as low as 2. A layer of granular can be spread onto the geogrid to form an immediate stiff formation for construction traffic and load bearing subgrade. For more, talk to Steven Lee at [email protected].
Extensive performance research has shown that hexagonal aperture confines aggregate better to support and spread heavy load, limiting rutting and differential settlement, prolonging serviceability. With proper engineered design, thickness of aggregate can be reduced to a minimum,
TriAx interlock granular material
Deckdrain with Woven Geotextile Filter ABG developed Deckdrain in UK 20 years ago. The drainage composite has worldwide recognition since. It has a single cuspated HDPE core and a non-woven geotextile filter bonded to one side, an equivalent of Miradrain, ideal for drainage behind retaining wall. Deckdrain now comes with a woven geotextile filter which can be used as an engineered drainage layer beneath concrete slabs and in subsurface structure. For info, prices and availability, contact Ivan at [email protected].
TriAx distribute heavy loading instantly
Mini Roll Geotextile for Landscaping Geotextile is commonly used as soil and aggregate separation in planter boxes. Bonar used to supply jumbo roll that suits most civil engineering. Mini rolls Bontec NW 6 UV are now available. This has all the standard filter and drainage characteristics but comes in 2 m width x 25 - 50 m length, weighs 5 – 10 kg. It is ideal for small projects with limited space where manual operation is essential. Some sample rolls are available for trial. Contact Ivan at [email protected].
Mini roll geotextile NW6
HKT submarine fiber optic cable between TKO and Siu Sai Wan – Maccaferri prefabricated articulating concrete block mats are fabricated in Malaysia and shipped to Hong Kong. It finds excellent application in ballasting and protection of valuable cable laid on seabed. ivan@g- and-e.com.
Deckdrain
Subgrade stabilization and reduction of differential settlement at Cape Town Stadium, South Africa
3.
Technical Note European Union – Falling Rock Protection Kit Certification European Organisation for Technical Approvals (EOTA) published ETAG 027 a guideline for technical approval of falling rockfall protection kits in 2008. The aim was to approve and certify steel barriers according to a common European Union (EU) standard and practice. In July 2018, EOTA issued the European Assessment Document: EAD 340059, a new guideline in assessing falling rock protection kit, replacing ETAG 027.
Under ETAG 027, the certificate issued was European Technical Approval (ETA(Approval)) whereas under the EAD 340059, the certificate refers to European Technical Assessment (ETA(Assessment)). Both documents provide the same testing method and assessment procedure, under which full-scale tests would have to be done by a qualified conducting body and inspected and certified by a Technical Approval/Assessment Body (TAB) designated by EOTA. The TAB (as listed in EOTA website https://www.eota.eu/en-GB/content/how-to-find-a-tab/55/) are authorized and entrusted to issue the ETAG and EAD certificate.
Notwithstanding this, all flexible barriers tested and certified under ETAG 027 remain valid and comply to EAD 340059 based on the equivalence of full- scale test procedures, method of assessment and verification and of constancy of performance between ETAG 027 and EAD 340059. Current ETAG certificate with a 5 years validity has been converted to EAD certificate which has an unlimited validity. The certificate verifies and ensures the flexible barrier meets the specific performance, based on which, many flexible barriers are specified and approved. The approval procedure is adopted not only within the EU, but worldwide including Hong Kong. For more details, call Steven [email protected].
European Technical Approval Guideline (ETAG 027)
European Assessment Document (EAD 340059)
Opinion Column Sheet Membrane Seaming Proper field seaming is fundamental to the integrity of water tightness when working with sheet membrane. There are several methods.
Extrusion welding of HDPE membrane into one integral sheet
Wedge welding into one integral sheet with air test channel
Wedge welding of HDPE membrane with double seam
Method Procedure Conditon Remarks
Thermal bonding
Surface cleaning & temp dependent
Chemical bonding
Controlled amount of solvent, curing, setting ; environment condition & cleaniless dependent
Uncertain and inconsistent seam strength
Adhesive bonding
Durability of adhesion, low seam strenth
Extrusion welding
A ribbon of molten polyolefin is extruded over the overlap, melt and bond
Surface grinding, equipment welding rod needed
Form one integral sheet, seam strength & integrity is ensured
Thermal fusion welding
Double track hot wedge melts the surfaces, roll pressure to press the heated surface
Equipment limited to straight seam
Reliable with double weld, seam quality is fully controlled
https://www.eota.eu/en-GB/content/how-to-find-a-tab/55/
mailto:[email protected]
Sheet1
Method
Procedure
Conditon
Remarks
Overlapping
Surface cleaning & temp dependent
Chemical bonding
Controlled amount of solvent, curing, setting ; environment condition & cleaniless dependent
Uncertain and inconsistent seam strength
Adhesive bonding
Durability of adhesion, low seam strenth
Extrusion welding
A ribbon of molten polyolefin is extruded over the overlap, melt and bond
Surface grinding, equipment welding rod needed
Form one integral sheet, seam strength & integrity is ensured
Thermal fusion welding
Double track hot wedge melts the surfaces, roll pressure to press the heated surface
Equipment limited to straight seam
Reliable with double weld, seam quality is fully controlled
G and E Times
4.
Reader’s Response Let us hear from you. Write to us at [email protected]. For back issue, please write to [email protected] or visit our website at www.g-and-e.com.
Disclaimer The materials contained in this newsletter are provided for general information purpose only and do not constitute legal or other professional advice.
G and E Company Limited 14th Floor, Kiu Yin Commercial Building, 361-363 Lockhart Road, Wanchai, Hong Kong Tel: 2570 0103 Fax: 2570 0089 e-mail: [email protected] http://www.g-and-e.com
Tell a Colleague - Want your colleague to receive G and E Times also, click here.
Unsubscribe If you do not wish to receive G and E Times in the future, please reply to this e-mail stating “Unsubscribe” in the subject.
September 2019. Issue No.32
G and E has established representation with more than 50 globally renowned manufacturers covering a fully diversified range of geosynthetics. From the early 1990’s, our scope extended from being a distributor / supplier to engineering application, designer and installation contractor. In the last issue, I began our history of introducing geosynthetics into the market here, from 1987 to 2003, our journey continues….
A Word from General Manager
For Your Information
2000 – 5,000 kJ rockfall barrier, Discovery Bay 2009 – GCL Bentoliner, Route 8 Tsing Yi 2010 – 1,000 gsm non-woven, Central Wanchai Bypass 2011 – Geotextile container, Express Railway Line 2011 – PVC T-keyed lining, Stonecutter Sewage Treatment Plant 2011 – Grass Paver, TKO landfill restoration 2012 – Geogrid reinforced surcharge, Wo Shang Wai 2012 – Tunnel invert drainage geocomposite, MTR West Island Line 2013 – Pre-fabricated band drain, HK-Zhuhai-Macau Bridge
2003 – Geomembrane wetland, MTR West Rail Line, Kam Tin 2004 – Concrete mat, Shing Mun River 2005 – Geogrid reinforced fill slope, NENT Landfill 2005 – Woven geotextile for silt curtain, debut 2006 – Lining system with vegetation, Kau Sai Chau Golf Course 2007 – Waterproofing lining system, design, supply and installation, the Venetian, Macau 2008 – Light weight geotextile slope cover, Anderson Road Development
While there are merit and drawback with each seaming method, the key is to attend to details, to ensure all overlaps are seamed properly and continuously. Seam quality can be verified by testing during and post installation. Seam integrity can be affected when the seam is subject to consistent straining, movement, environment in contact and deterioration of seam components. Welding to form an integral sheet seems to be the most effective.
Opinion Column (Con’t)
We stepped into our 36th year in business last June, with enthusiasm, passion and some anxiety. The kick-off dinner was shared with our principals, associates, partners and, of course, our entire devoted company backbone, and some of our earlier staff as well. Over sumptuous gourmet and wine, everyone cracked jokes, reminded each others’ past glories, touched off embarrassments and greeted with best wishes. I drew a recap on the pain and joy we have come to this stage from 1984. It is this moment that we hope we will be able to foster a more competent team to look after our clients with commitment and dedication.
35th Anniversary Recap
A happy G and E team A moment of joy and sharing Some of our principals from ACE, CeTeau, Bonar, Maccaferri, Q. One, Solmax, Tensar
Geotextile • Mini Roll Geotextile for
Landscaping Technical Note European Union – Falling Rock Protection Kit Certification Opinion Column Sheet Membrane Seaming For Your Information • A Word from General
Manager • 35th Anniversary Recap Reader’s Response
September 2019. Issue No.32
Interesting Projects We have seen projects with very typical usage of geosynthetics and related products, some in unique applications. Here are several products that catch our attention and might be of interest to you.
CV/2013/08 - at Liantang / Heung Yuen Wai Boundary Crossing, BOSTD geocell is designed to retain 150 mm thick of planting soil on steep cut slope for vegetation establishment. [email protected].
At SENT Landfill – Bonar 185 l/m2/s high permeability woven geotextile is used as French drain drainage filter separation. The HF series allows up to a 400 l/m2/s water flow rate. ivan@g- and-e.com.
CV/2012/05 - at Lung Mei Bathing Beach, Maccaferri gabion is used to construct a 4 m high wing wall leading to an open drainage channel extended from the box culvert to the outfall. natural@g- and-e.com.
DC/2009/24 - at Harbour Area Treatment Scheme (HATS) Cyberport Port landing, ACE high strength woven geotextile is prefabricated into a 150 mm φ x 4 m tube in which grout is infilled to form a concrete joining pin to interlock vertical seawall blocks. ivan@g- and-e.com.
In a Tsuen Wan Private Development – Daehan Hori- drain, a 200 mm width x 9 mm thick prefabricated drainage composite is designed to dissipate water pressure in the basement structure. [email protected].
HY/2014/06, at Hiram Highway expansion, Maccaferri Macmat is used for slope erosion protection, the polyamide mat offers distinct fire-retardant characteristic. [email protected].
NE201501, at Lam Tin – TKO tunnel – Bonar woven geotextile is sent to Korea to fabricate into a hybrid silt curtain incorporating a widely accepted Bontec SG110/110 geotextile to an engineered design silt curtain. [email protected].
G and E Times
September 2019. Issue No.32
New Product / Application TriAx Geogrid Tensar introduces the concept of soft ground stabilization by confining and interlock granular to initiate lateral restraint using radial stiffness of triaxial geogrid, as opposed to tension membrane where high strength geosynthetics are sought to carry the loading by anchorage and friction.
site activity becomes more cost effective and efficient.
TriAx geogrid is developed under this principle. It is ideal for formation of temporary access, haul road and working platform. The geogrid can be laid on area with CBR as low as 2. A layer of granular can be spread onto the geogrid to form an immediate stiff formation for construction traffic and load bearing subgrade. For more, talk to Steven Lee at [email protected].
Extensive performance research has shown that hexagonal aperture confines aggregate better to support and spread heavy load, limiting rutting and differential settlement, prolonging serviceability. With proper engineered design, thickness of aggregate can be reduced to a minimum,
TriAx interlock granular material
Deckdrain with Woven Geotextile Filter ABG developed Deckdrain in UK 20 years ago. The drainage composite has worldwide recognition since. It has a single cuspated HDPE core and a non-woven geotextile filter bonded to one side, an equivalent of Miradrain, ideal for drainage behind retaining wall. Deckdrain now comes with a woven geotextile filter which can be used as an engineered drainage layer beneath concrete slabs and in subsurface structure. For info, prices and availability, contact Ivan at [email protected].
TriAx distribute heavy loading instantly
Mini Roll Geotextile for Landscaping Geotextile is commonly used as soil and aggregate separation in planter boxes. Bonar used to supply jumbo roll that suits most civil engineering. Mini rolls Bontec NW 6 UV are now available. This has all the standard filter and drainage characteristics but comes in 2 m width x 25 - 50 m length, weighs 5 – 10 kg. It is ideal for small projects with limited space where manual operation is essential. Some sample rolls are available for trial. Contact Ivan at [email protected].
Mini roll geotextile NW6
HKT submarine fiber optic cable between TKO and Siu Sai Wan – Maccaferri prefabricated articulating concrete block mats are fabricated in Malaysia and shipped to Hong Kong. It finds excellent application in ballasting and protection of valuable cable laid on seabed. ivan@g- and-e.com.
Deckdrain
Subgrade stabilization and reduction of differential settlement at Cape Town Stadium, South Africa
3.
Technical Note European Union – Falling Rock Protection Kit Certification European Organisation for Technical Approvals (EOTA) published ETAG 027 a guideline for technical approval of falling rockfall protection kits in 2008. The aim was to approve and certify steel barriers according to a common European Union (EU) standard and practice. In July 2018, EOTA issued the European Assessment Document: EAD 340059, a new guideline in assessing falling rock protection kit, replacing ETAG 027.
Under ETAG 027, the certificate issued was European Technical Approval (ETA(Approval)) whereas under the EAD 340059, the certificate refers to European Technical Assessment (ETA(Assessment)). Both documents provide the same testing method and assessment procedure, under which full-scale tests would have to be done by a qualified conducting body and inspected and certified by a Technical Approval/Assessment Body (TAB) designated by EOTA. The TAB (as listed in EOTA website https://www.eota.eu/en-GB/content/how-to-find-a-tab/55/) are authorized and entrusted to issue the ETAG and EAD certificate.
Notwithstanding this, all flexible barriers tested and certified under ETAG 027 remain valid and comply to EAD 340059 based on the equivalence of full- scale test procedures, method of assessment and verification and of constancy of performance between ETAG 027 and EAD 340059. Current ETAG certificate with a 5 years validity has been converted to EAD certificate which has an unlimited validity. The certificate verifies and ensures the flexible barrier meets the specific performance, based on which, many flexible barriers are specified and approved. The approval procedure is adopted not only within the EU, but worldwide including Hong Kong. For more details, call Steven [email protected].
European Technical Approval Guideline (ETAG 027)
European Assessment Document (EAD 340059)
Opinion Column Sheet Membrane Seaming Proper field seaming is fundamental to the integrity of water tightness when working with sheet membrane. There are several methods.
Extrusion welding of HDPE membrane into one integral sheet
Wedge welding into one integral sheet with air test channel
Wedge welding of HDPE membrane with double seam
Method Procedure Conditon Remarks
Thermal bonding
Surface cleaning & temp dependent
Chemical bonding
Controlled amount of solvent, curing, setting ; environment condition & cleaniless dependent
Uncertain and inconsistent seam strength
Adhesive bonding
Durability of adhesion, low seam strenth
Extrusion welding
A ribbon of molten polyolefin is extruded over the overlap, melt and bond
Surface grinding, equipment welding rod needed
Form one integral sheet, seam strength & integrity is ensured
Thermal fusion welding
Double track hot wedge melts the surfaces, roll pressure to press the heated surface
Equipment limited to straight seam
Reliable with double weld, seam quality is fully controlled
https://www.eota.eu/en-GB/content/how-to-find-a-tab/55/
mailto:[email protected]
Sheet1
Method
Procedure
Conditon
Remarks
Overlapping
Surface cleaning & temp dependent
Chemical bonding
Controlled amount of solvent, curing, setting ; environment condition & cleaniless dependent
Uncertain and inconsistent seam strength
Adhesive bonding
Durability of adhesion, low seam strenth
Extrusion welding
A ribbon of molten polyolefin is extruded over the overlap, melt and bond
Surface grinding, equipment welding rod needed
Form one integral sheet, seam strength & integrity is ensured
Thermal fusion welding
Double track hot wedge melts the surfaces, roll pressure to press the heated surface
Equipment limited to straight seam
Reliable with double weld, seam quality is fully controlled
G and E Times
4.
Reader’s Response Let us hear from you. Write to us at [email protected]. For back issue, please write to [email protected] or visit our website at www.g-and-e.com.
Disclaimer The materials contained in this newsletter are provided for general information purpose only and do not constitute legal or other professional advice.
G and E Company Limited 14th Floor, Kiu Yin Commercial Building, 361-363 Lockhart Road, Wanchai, Hong Kong Tel: 2570 0103 Fax: 2570 0089 e-mail: [email protected] http://www.g-and-e.com
Tell a Colleague - Want your colleague to receive G and E Times also, click here.
Unsubscribe If you do not wish to receive G and E Times in the future, please reply to this e-mail stating “Unsubscribe” in the subject.
September 2019. Issue No.32
G and E has established representation with more than 50 globally renowned manufacturers covering a fully diversified range of geosynthetics. From the early 1990’s, our scope extended from being a distributor / supplier to engineering application, designer and installation contractor. In the last issue, I began our history of introducing geosynthetics into the market here, from 1987 to 2003, our journey continues….
A Word from General Manager
For Your Information
2000 – 5,000 kJ rockfall barrier, Discovery Bay 2009 – GCL Bentoliner, Route 8 Tsing Yi 2010 – 1,000 gsm non-woven, Central Wanchai Bypass 2011 – Geotextile container, Express Railway Line 2011 – PVC T-keyed lining, Stonecutter Sewage Treatment Plant 2011 – Grass Paver, TKO landfill restoration 2012 – Geogrid reinforced surcharge, Wo Shang Wai 2012 – Tunnel invert drainage geocomposite, MTR West Island Line 2013 – Pre-fabricated band drain, HK-Zhuhai-Macau Bridge
2003 – Geomembrane wetland, MTR West Rail Line, Kam Tin 2004 – Concrete mat, Shing Mun River 2005 – Geogrid reinforced fill slope, NENT Landfill 2005 – Woven geotextile for silt curtain, debut 2006 – Lining system with vegetation, Kau Sai Chau Golf Course 2007 – Waterproofing lining system, design, supply and installation, the Venetian, Macau 2008 – Light weight geotextile slope cover, Anderson Road Development
While there are merit and drawback with each seaming method, the key is to attend to details, to ensure all overlaps are seamed properly and continuously. Seam quality can be verified by testing during and post installation. Seam integrity can be affected when the seam is subject to consistent straining, movement, environment in contact and deterioration of seam components. Welding to form an integral sheet seems to be the most effective.
Opinion Column (Con’t)
We stepped into our 36th year in business last June, with enthusiasm, passion and some anxiety. The kick-off dinner was shared with our principals, associates, partners and, of course, our entire devoted company backbone, and some of our earlier staff as well. Over sumptuous gourmet and wine, everyone cracked jokes, reminded each others’ past glories, touched off embarrassments and greeted with best wishes. I drew a recap on the pain and joy we have come to this stage from 1984. It is this moment that we hope we will be able to foster a more competent team to look after our clients with commitment and dedication.
35th Anniversary Recap
A happy G and E team A moment of joy and sharing Some of our principals from ACE, CeTeau, Bonar, Maccaferri, Q. One, Solmax, Tensar