tunnelling solutions: soil nailing
TRANSCRIPT
Versatile Engineering:Solutions for Reinforcement and Stabilisation
CONSULTANT:
CLIENT:
CONTRACTOR:
E-mail: [email protected]
CONSULTANTS PTE LTD
Tel: 6273 5622 Fax: 6273 8454E-Centre @ Redhill Singapore 1594713791 Jalan Bukit Merah #05-18
CONTRACTOR'S PE:
PROJECT:
CONSULTANT:
CLIENT:
CONTRACTOR:
E-mail: [email protected]
CONSULTANTS PTE LTD
Tel: 6273 5622 Fax: 6273 8454E-Centre @ Redhill Singapore 1594713791 Jalan Bukit Merah #05-18
CONTRACTOR'S PE:
PROJECT:
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GFRP Bolts are the light, strong and rapid way to stabilise soil and rock slopes
GFRP CRG Bolt 700 - Mechanical PropertiesMaterial Standard(1) Value - Series 700 UnitDensity ISO 1183 ≥1.90 kg/dm³Glass content ISO 3451-1 ≥ 60 %Modulus ASTM D7205-06 ≥ 45000 N/mm²
GFRP CRG Bolt 700 ØoD
(1)
[mm]Area(1)
[mm²]Ultimate Tensile Load
[kN]f* fu Tensile Strength
[Mpa]Weight[kg/m]
20 269 200 700 0.5622 330 250 700 0.6925 434 320 700 0.9328 552 400 700 1.2032 731 550 700 1.5538 1046 750 700 2.2540 1164 790 650 2.48
Performance vs SteelMaterial Steel GFRPTensile strength (MPa) 275-517 600 to 1100Modulus (GPa) 200 35 to 51Material density (g/cm³) 7.90 1.80 - 2.00
GFRP CRG Bolt - Key Benefits > High tensile and high flexural strength; 2 - 4 times stronger than steel > Easy to handle; 75% lighter than steel; safe, rapid, cost-effective > Easy to cut and can be easily broken out without damaging construction equipment > Corrosion resistant > System components include: couplers, hexagonal nuts and more
Hexagonal Nut Round Coupler
Inner Diameter
[mm]
Outer Diameter[mm]
Length[mm]
Ultimate Work Load (Coupler-
GFRP CRG Bolt) [kN]
Outer Diameter[mm]
Length[mm]
Ultimate Work Load (Coupler-
GFRP CRG Bolt) [kN]
20 36 100 100 30 150 90
22 36 100 120 30 150 9025 36 100 200 34 200 20028 38 100 220 39 200 22032 46 150 280 44 200 280
Note:¹ Dimension/performance tolerance +/-4% due to the natural shrinkage of the polyester resin used
Additional sizes and high performance couplers available on request.
eA reliable, high performance system for soil nailing and boltingOur GFRP CRG bolts are engineered from unidirectional glass fibre in a polyester resin matrix, with a continuous threaded profile. This profile and construction delivers significant performance improvements in friction effect (pull-out) and tensile strength.
A steel fitment enables these GFRP elements to be post-tensioned in bolting applications. A self-drilling system is available to address collapsible soil conditions.
GFRP CRG bolts are corrosion resistant, making them an ideal solution in aggressive environments such as mining works.
Our bolts form part of a system of carefully selected components including hexagonal nuts and couplers.
ngineeringVersatile
The pictures (above) show the different mechanical interaction between bars and cement grout during laboratory pull-out tests on conventional GFRP bars (regular threading AM) and GFRP CRG (CRG).
The graphs (right) show results from laboratory pull-out tests on standard improved adherence (AM, dashed lines) and corrugated (CRG, solid lines) bars, 24 hours and 48 hours after grout injection.
GFRP CRG Bolts
Conventional GFRP rebar
CRG profile detail
CRG rebar
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GFRP CRG Bolt 700Applications
Nailing (Ground Consolidation) > Passive reinforcement of the ground through the GFRP Bolt > Typically used to stabilise existing slopes or excavations where top-down construction can be an effective and viable
solution to other retaining systems > Can also be used for ground consolidation, e.g. for pre-consolidation of the tunnel face ahead of excavation
Benefits > High performance slope stabilisation > Can be used in conjunction with facing systems, including slope revegetation
Self Drilling (Type A) > The self drilling bolt system allows fast and efficient installation for soil or weak rock improvement > The drilling bit is fitted directly to the GFRP Bolt and the GFRP Bar works as the drilling rod > It is possible to use solid bar or hollow bar (mortar injection within the bar)
Benefits > High production in adverse soil conditions. The casing is not necessary in order to maintain the stability of the drill wall > Faster installation in time-critical situations
System components include:
Nut
Plate
GFRP CRG Bolt
Round steel couplers
Bit
Hexagonal Head Nut
Coupler with Mid-Stop
Coupler
3
Self Drilling (Type B) > Used for hard rock and wedge stabilisation or where long nails are required > A sacrificial drilling ring is fitted to the hollow GFRP bar. Installation utilises a steel drilling rod with a down-hole hammer,
which are retractable once drilling is complete > This system limits the torsion and compression on the GFRP bar
Benefits > Greater depths are possible without damage to the bar > Reduced installation time and better control on drilling alignment
Bolting > GFRP Bolt is used to reinforce and support partially detached, thinly laminated or incompetent rock which otherwise would
be subject to failure > GFRP Bolt introduces additional stresses and strains in the rock helping stabilise the rock mass > System consists of GFRP Bolts anchored with chemical or cement grout and post-tensioned with plate and nut
Benefits > Stabilisation and improvement of unstable face conditions increases safety > Eases the excavation, removal and disposal (refer to local regulations) compared with standard steel bolts
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© 2016 Officine Maccaferri S.p.A. - Bologna - Italy. Photo: Officine Maccaferri Archive
Officine Maccaferri S.p.A.Via J.F. Kennedy, 1040069 Zola Predosa (Bologna) - ItalyT: +(39) 051 643 6000F: +(39) 051 643 6201E: [email protected]
www.maccaferri.com
Maccaferri operates under strict quality assurance and management procedures. Please visit the website of your local subsidiary for details of their Certifications.
Officine Maccaferri is at the heart of the Maccaferri Industrial Group. Its continued growth is based upon long-held values of innovation, integrity, excellent service and respect for the environment.Maccaferri ’s vision is to become a leading international provider of advanced solutions to the civi l engineering and construction market. Implementing a strategy of vertical integration, Maccaferri researches, manufactures, designs, supplies and constructs solutions within its target markets.The capabil i ty of the business continues to expand due to a strategic plan to open new markets and grow existing ones; Maccaferri now offers advanced engineered solutions from beach nourishment to reinforced soil structures and from rockfall mitigation to tunnell ing systems.With nearly 3000 employees, over 30 manufacturing facil i t ies and local operations in 100 countries around the world, Maccaferri can truly claim to have a global presence with local focus.
Maccaferri: Engineering a Better Solution
Maccaferri ’s motto is ‘Engineering a Better Solution’; We do not merely supply products, but work in partnership with our cl ients, offering technical expertise to deliver versati le, cost effective and environmentally sound solutions. We aim to build mutually beneficial relationships with cl ients through the quality of our service and solutions.
Founded in 1879, Officine Maccaferri soon became a technical reference in the design and development of solutions for erosion control and retaining structures. Since then, through technological innovation, geographical expansion and focussed diversif ication, Maccaferri now offers solutions at a global level for a wide range of civi l and environmental engineering applications.
Maccaferri reserves the right to amend product specifications without notice and specifiers are requested to check as to the validity of the specifications they are using.
Officine MaccaferriGroup Profile
Consultancy and Partnership
Organisational Structure
Maccaferri AsiaRegional HQ, Unit 3A-11, Block G, Phileo Damansara 1No.9 Jalan 16/11, Off Jalan Damansara, 46350 Petaling Jaya, Selangor Darul Ehsan, MalaysiaT: +(60-3) 7957 8330F: +(60-3) 7957 9080E: [email protected]
www.maccaferri.com/asia