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  • Pretec Group – Rock support – combination bolts with

    Combination bolts are effective for immediate work protection at the face after torque tensioning, and when later fully grouted, can be classified as permanent support. Workers are installing rock bolts in the face area while grouting of the bolts takes place at a convenient time and distance behind the face (typically about 50m).

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  • Combination bolt for rock support_Products__Zhejiang ...

    Combination bolt for rock support; Mortar bolt; Self-drilling anchor bolt; Zhejiang Pretec. Member of the Norwegian Pretec Group. In order to fully control the product quality to high standards, the complete manufacturing process is completed in our own factory. Machinery production and corrosion protection are in line with international ...

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  • Chinapretec Sn Rock Bolt - China Sn Bolt, Rock Bolt in Bolts

    2016-3-30u2002·u2002Chinapretec Sn Rock Bolt, Find details about China Sn Bolt, Rock Bolt in Bolts from Chinapretec Sn Rock Bolt - Zhejiang Pretec Metal Products Co., Ltd

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  • NC-Bolt M22 Combination Bolt/Rock Support - Pretec

    Pretec AS – www.pretec.no – Telefon: +47 69 10 24 60 Innhold kan endres uten forutgående beskjed. NC-Bolt M22 Combination Bolt/Rock Support Combination Bolt designed for immediate and permanent rock support NC-Bolt M22 combination bolt for rock anchoring. The bolt is used with an expansion shell for immediate work safety support.

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  • NC-Bolt M20 Combination Bolt/Rock Support - Pretec

    Pretec AS – www.pretec.no – Telefon: +47 69 10 24 60 Innhold kan endres uten forutgående beskjed. NC-Bolt M20 Combination Bolt/Rock Support Combination Bolt designed for immediate and permanent anchoring NC-Bolt M20 combination bolt for rock anchoring. The bolt is used with an expansion shell for immediate work safety support.

    Get Price
  • Company Profiles_About__Zhejiang Pretec Metal Produtcs

    Pretec Group is currently one of the most important suppliers of anchor bolts for underground engineering in Norway and the Nordic region. The group currently owns 6 companies in Norway, Sweden, Finland, Denmark, Belgium and China. Zhejiang Pretec Metal Products …

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  • 0+ 1 - pretec.no

    2021-7-6u2002·u2002(19,5210(17$/352'8&7'(&/$5$7,21 '# '( ) % ''( * ) ''( + ' ''( ))' - ! $ %& ' $ %& ' 1(3' (1) 0+ 1 ! + # ) & ) 23 45. . 0' #) 6#, ! ' ! 9 '#

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  • ZheJiang Pretec Metal Products Co.,Ltd - rock bolt ...

    ZheJiang Pretec Metal Products Co.,Ltd - China supplier of rock bolt, combination bolt, anchor bolt, mining rock bolt

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  • PC-Bolt R27/12 Combination Bolt/Rock Support (G4)(id ...

    PC-Bolt R27/12 Combination Bolt/Rock Support (G4)(id:9859238), View quality rock bolt in bolts, rock bolt in anchors, hollow grouting rock bolt details from ZheJiang Pretec Metal Products Co.,Ltd storefront on EC21.com. Buy best PC-Bolt R27/12 Combination Bolt/Rock Support (G4) with escrow buyer protection.

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  • NC-Bolt M20 Combination Bolt/Rock Support - Pretec

    Pretec AS – www.pretec.no – Telefon: +47 69 10 24 60 Innhold kan endres uten forutgående beskjed. NC-Bolt M20 Combination Bolt/Rock Support Combination Bolt designed for immediate and permanent anchoring NC-Bolt M20 combination bolt for rock anchoring. The bolt is used with an expansion shell for immediate work safety support.

    Get Price
  • NC-Bolt M22 Combination Bolt/Rock Support - Pretec

    Pretec AS – www.pretec.no – Telefon: +47 69 10 24 60 Innhold kan endres uten forutgående beskjed. NC-Bolt M22 Combination Bolt/Rock Support Combination Bolt designed for immediate and permanent rock support NC-Bolt M22 combination bolt for rock anchoring. The bolt is used with an expansion shell for immediate work safety support.

    Get Price
  • 0+ 1 - pretec.no

    2021-7-6u2002·u2002(19,5210(17$/352'8&7'(&/$5$7,21 '# '( ) % ''( * ) ''( + ' ''( ))' - ! $ %& ' $ %& ' 1(3' (1) 0+ 1 ! + # ) & ) 23 45. . 0' #) 6#, ! ' ! 9 '#

    Get Price
  • PC-Bolt R27/12 Combination Bolt/Rock Support (G4)(id ...

    PC-Bolt R27/12 Combination Bolt/Rock Support (G4)(id:9859238), View quality rock bolt in bolts, rock bolt in anchors, hollow grouting rock bolt details from ZheJiang Pretec Metal Products Co.,Ltd storefront on EC21.com. Buy best PC-Bolt R27/12 Combination Bolt/Rock Support (G4) with escrow buyer protection.

    Get Price
  • Rebar bolt Ø25/M24 Rock support bolt/ceiling bolt

    Pretec AS – www.pretec.no – Telefon: 69 10 24 60 Innhold kan endres uten forutgående beskjed. Rebar bolt Ø25/M24 Rock support bolt/ceiling bolt Rock support bolt. The end of the bolt is obliquely cut for improved polyester mixing. Can also be used fully embedded in polyester or cementitious mortar.

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  • ZheJiang Pretec Metal Products Co.,Ltd - rock bolt ...

    ZheJiang Pretec Metal Products Co.,Ltd - China supplier of rock bolt, combination bolt, anchor bolt, mining rock bolt

    Get Price
  • Key Features - DYWIDAG-Systems International UK

    Rock Bolts and Meshes. Stabilisation vs. Drapery. Passive Drapery Systems; Stabilisation Systems; Rock Bolts. GEWI ® GEWI ® Plus; Expansion Shell Anchors; Accessories. Bearing Plate; Resins; Grout Sock; Meshes. Key Features; Geocomposites; DYWI ® Mat; Wire Rope; DYWIDAG HCR Stainless Steel; Marine Rock Bolting - Marine Grade Meshes; DYWIDAG ...

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  • Safer, Simpler, Speedier Rock Bolting

    2020-4-8u2002·u2002Safer, Simpler, Speedier Rock Bolting. December 2019 Features. MacLean's flagship product, the battery-powered 975 Omnia scissor bolter. (Photo: MacLean Engineering) E&MJ examines some recent advances in rock bolting technology. By Carly Leonida, European Editor. As hard-rock mines delve deeper, one of the primary challenges they face is ...

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  • Table of design properties for metric steel bolts M5 to ...

    1993-1-8u2002·u2002Design properties for metric hex bolts (Typical coarse pitch thread) Dimensions Hole diameter d 0 [mm] Areas Tensile resistance F t,Rd [kN] Shear resistance per shear plane F v,Rd [kN] Bearing resistance per mm of connected plate thickness F v,Rd t [kN/mm] (for e 1 ≥3d 0, e 2 ≥1.5d 0, p 1 ≥3.75d 0, p 2 ≥3d 0) Punching resistance per mm of plate thickness under bolt or nut B …

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  • What is BOLTS in geography and map making? - Answers

    2014-3-25u2002·u2002BOLTS is the term given to the essential components of mapping. The B in BOLTS stands for BORDER: The Border of the Map, where the map ends, it's very important to mark the edges so that the size ...

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  • NC-Bolt M20 Combination Bolt/Rock Support - Pretec

    Pretec AS – www.pretec.no – Telefon: +47 69 10 24 60 Innhold kan endres uten forutgående beskjed. NC-Bolt M20 Combination Bolt/Rock Support Combination Bolt designed for immediate and permanent anchoring NC-Bolt M20 combination bolt for rock anchoring. The bolt is used with an expansion shell for immediate work safety support.

    Get Price
  • Key Features - DYWIDAG-Systems International UK

    Rock Bolts and Meshes. Stabilisation vs. Drapery. Passive Drapery Systems; Stabilisation Systems; Rock Bolts. GEWI ® GEWI ® Plus; Expansion Shell Anchors; Accessories. Bearing Plate; Resins; Grout Sock; Meshes. Key Features; Geocomposites; DYWI ® Mat; Wire Rope; DYWIDAG HCR Stainless Steel; Marine Rock Bolting - Marine Grade Meshes; DYWIDAG ...

    Get Price
  • Rockbolting Technology Keeps Mines Safe and Secure

    2020-4-8u2002·u2002• Bieniawski's rule that the bolt-length to bolt-spacing ratio is acceptable between 1.2:1 and 1.5:1 in mining; and • The finding that a mechanical rock bolt installed 30° off square to the rock face may provide only 25% of the support tension produced by a comparable bolt drilled straight into the rock, unless a spherical washer is used.

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  • Shear strength criteria for rock, rock joints, rockfill ...

    2013-8-1u2002·u2002An extensive recent study by Singh et al. (2011) in Roorkee University involving re-analysis of thousands of reported triaxial tests, including their own testing contributions, has revealed the astonishing simplicity of the following equality: σ c ≈ σ 3(critical) for the majority of rock types: in other words, the two Mohr circles referred to in Fig. 2 are touching at their …

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  • Rocky Regulations

    2020-9-9u2002·u2002A s rock climbing has taken off and rock gyms have skyrocketed in popularity, the number of visitors to Smith Rock State Park has doubled over the last decade, park managers say. Today, fixed hardware, or 'bolts,' fill its rock faces. With so much traffic there, local climbers, historically perceived as law-defying rebels, are welcoming more regulations from the …

    Get Price
  • RS2

    RS2 (Formerly RS 2 or Phase 2) is a powerful 2D finite element program for soil and rock applications. RS2 can be used for a wide range of engineering projects including excavation design, slope stability, groundwater seepage, probabilistic analysis, consolidation, and dynamic analysis capabilities.. Complex, multi-stage models can be easily created and quickly analyzed – tunnels …

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  • New Austrian Tunneling Method - an overview ...

    2001-6-2u2002·u2002The damaged tunnel can be divided into three parts: the east tunnel, the central tunnel, and the west tunnel (Fig. 5.18).To facilitate the reconstruction of the damaged tunnels, parallel retaining walls 23 m away from the tunnels and some 263 m in length were constructed along the damaged tunnels.The excavation was 38 m in depth.At some sections, the excavation depth was …

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  • New Austrian Tunneling Method (NATM): Design and Operation ...

    ???? Reading time: 1 minute The New Austrian Tunneling Method (NATM), also known as the sequential excavation method, gained recognition during the tunneling operations in the Austrian Alps. The technique proved to be very useful in sophisticated and diversified geological conditions where forecasting of the rock mass is difficult due to rapidly changing geology. NATM […]

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  • Music Articles & Features

    The 45 Most Anticipated Albums of Fall 2021: The War on Drugs, Kacey Musgraves, Lizzo, Drake, and More. New releases to look forward to in the coming …

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  • Feature » Video Game News, Reviews, Walkthroughs And ...

    2021-9-27u2002·u2002Aragami 2 – 14 Features You Need To Know Taking place 100 years after the original, the sequel sees players fighting against the Akatsuchi Empire …

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  • NC-Bolt and Pc-Bolt EPD final version - Pretec AS

    2019-2-8u2002·u2002bolt: NC-Bolt M20x2.5 (rebar bolt) and Pc-Bolt 27/15 (tube bolt). The main manufacturing processes of the two products are the same. There is only minor difference during the assembling process. A combination bolt is installed for immediate support of rock, anchored by an expansion shell, and to be fully grouted at

    Get Price
  • Productprogram - Pretec

    2019-10-4u2002·u2002Rock bolt M20x3000 HDG 607 104203000 Round steel 4.8/500 for M20x4000 HDG 807 104204000 expansion shell M20x5500 HDG 1110 10420550 Thead: 2xM20x150 Threaded bolt 8.8 Pc-Coat M16x260 Pc-Coat 35 108160260 Bolts for PE-foam, ceiling-and M16x310 Pc-Coat 42 108160310 -wall element etc. ...

    Get Price
  • Rockfall protection mesh - pretec.fi

    Pretec AS – www.pretec.no – Telefon: 69 10 24 60 Innhold kan endres uten forutgående beskjed. Rockfall protection mesh Rockfall protection mesh used as a system to prevent rockfall onto roads and railways. Is used together with rock bolts and other system elements to catch falling rocks from slopes and cuts and prevent falls onto roads

    Get Price
  • Key Features - DYWIDAG-Systems International UK

    Rock Bolts and Meshes. Stabilisation vs. Drapery. Passive Drapery Systems; Stabilisation Systems; Rock Bolts. GEWI ® GEWI ® Plus; Expansion Shell Anchors; Accessories. Bearing Plate; Resins; Grout Sock; Meshes. Key Features; Geocomposites; DYWI ® Mat; Wire Rope; DYWIDAG HCR Stainless Steel; Marine Rock Bolting - Marine Grade Meshes; DYWIDAG ...

    Get Price
  • ZheJiang Pretec Metal Products Co.,Ltd - Company Profile

    Pretec China (ZheJiang Pretec Metal Products Co.,Ltd) was established in June 2010. We produce and sell products for construction and infrastructure industry. Pretec Group operates in Finland, Norway, Sweden and Denmark. Pretec China is the production and purchase center of Pretec Group. We specialize in: Rock support Frost and water proofing;

    Get Price
  • Ekspansjonshylse for bolt til fjell - pretec.no

    2021-6-28u2002·u2002Expansion shell for rock bolt Expansion shells are used with various types of rock bolts, for example combination bolts such as PC and NC bolt. Gives immediately working support and provides excellent anchoring in hard and medium-hard rock types. Stock programme: Thread /type Surface Hole diameter Ø (mm) Weight (kg/pc)

    Get Price
  • Performance of bolting systems in tension and the ...

    2020-7-2u2002·u2002Rock bolt sleeve shear : Double shear test . Determination of the integrity of the rock bolt coated sleeve in shear : One test per vertical displacement of 15, 25 and 25 mm UOW method of double shearing . Tensile failure testing of rock bolts . The tensile strength test involved subjecting the bolt to tension until failure, to determine the

    Get Price
  • RS2

    RS2 (Formerly RS 2 or Phase 2) is a powerful 2D finite element program for soil and rock applications. RS2 can be used for a wide range of engineering projects including excavation design, slope stability, groundwater seepage, probabilistic analysis, consolidation, and dynamic analysis capabilities.. Complex, multi-stage models can be easily created and quickly analyzed – tunnels in weak or ...

    Get Price
  • Table of design properties for metric steel bolts M5 to ...

    1993-1-8u2002·u2002Design properties for metric hex bolts (Typical coarse pitch thread) Dimensions Hole diameter d 0 [mm] Areas Tensile resistance F t,Rd [kN] Shear resistance per shear plane F v,Rd [kN] Bearing resistance per mm of connected plate thickness F v,Rd t [kN/mm] (for e 1 ≥3d 0, e 2 ≥1.5d 0, p 1 ≥3.75d 0, p 2 ≥3d 0) Punching resistance per mm of plate thickness under bolt or nut B p,Rd t ...

    Get Price
  • Rocky Regulations

    2020-9-9u2002·u2002A s rock climbing has taken off and rock gyms have skyrocketed in popularity, the number of visitors to Smith Rock State Park has doubled over the last decade, park managers say. Today, fixed hardware, or 'bolts,' fill its rock faces. With so much traffic there, local climbers, historically perceived as law-defying rebels, are welcoming more regulations from the park—though a recent ...

    Get Price
  • NC-Bolt and Pc-Bolt EPD final version - Pretec AS

    2019-2-8u2002·u2002bolt: NC-Bolt M20x2.5 (rebar bolt) and Pc-Bolt 27/15 (tube bolt). The main manufacturing processes of the two products are the same. There is only minor difference during the assembling process. A combination bolt is installed for immediate support of rock, anchored by an expansion shell, and to be fully grouted at

    Get Price
  • Productprogram - Pretec

    2019-10-4u2002·u2002Rock bolt M20x3000 HDG 607 104203000 Round steel 4.8/500 for M20x4000 HDG 807 104204000 expansion shell M20x5500 HDG 1110 10420550 Thead: 2xM20x150 Threaded bolt 8.8 Pc-Coat M16x260 Pc-Coat 35 108160260 Bolts for PE-foam, ceiling-and M16x310 Pc-Coat 42 108160310 -wall element etc. ...

    Get Price
  • Rockfall protection mesh - pretec.fi

    Pretec AS – www.pretec.no – Telefon: 69 10 24 60 Innhold kan endres uten forutgående beskjed. Rockfall protection mesh Rockfall protection mesh used as a system to prevent rockfall onto roads and railways. Is used together with rock bolts and other system elements to catch falling rocks from slopes and cuts and prevent falls onto roads

    Get Price
  • Key Features - DYWIDAG-Systems International UK

    Rock Bolts and Meshes. Stabilisation vs. Drapery. Passive Drapery Systems; Stabilisation Systems; Rock Bolts. GEWI ® GEWI ® Plus; Expansion Shell Anchors; Accessories. Bearing Plate; Resins; Grout Sock; Meshes. Key Features; Geocomposites; DYWI ® Mat; Wire Rope; DYWIDAG HCR Stainless Steel; Marine Rock Bolting - Marine Grade Meshes; DYWIDAG ...

    Get Price
  • ZheJiang Pretec Metal Products Co.,Ltd - Company Profile

    Pretec China (ZheJiang Pretec Metal Products Co.,Ltd) was established in June 2010. We produce and sell products for construction and infrastructure industry. Pretec Group operates in Finland, Norway, Sweden and Denmark. Pretec China is the production and purchase center of Pretec Group. We specialize in: Rock support Frost and water proofing;

    Get Price
  • Ekspansjonshylse for bolt til fjell - pretec.no

    2021-6-28u2002·u2002Expansion shell for rock bolt Expansion shells are used with various types of rock bolts, for example combination bolts such as PC and NC bolt. Gives immediately working support and provides excellent anchoring in hard and medium-hard rock types. Stock programme: Thread /type Surface Hole diameter Ø (mm) Weight (kg/pc)

    Get Price
  • Performance of bolting systems in tension and the ...

    2020-7-2u2002·u2002Rock bolt sleeve shear : Double shear test . Determination of the integrity of the rock bolt coated sleeve in shear : One test per vertical displacement of 15, 25 and 25 mm UOW method of double shearing . Tensile failure testing of rock bolts . The tensile strength test involved subjecting the bolt to tension until failure, to determine the

    Get Price
  • RS2

    RS2 (Formerly RS 2 or Phase 2) is a powerful 2D finite element program for soil and rock applications. RS2 can be used for a wide range of engineering projects including excavation design, slope stability, groundwater seepage, probabilistic analysis, consolidation, and dynamic analysis capabilities.. Complex, multi-stage models can be easily created and quickly analyzed – tunnels …

    Get Price
  • Table of design properties for metric steel bolts M5 to ...

    1993-1-8u2002·u2002Design properties for metric hex bolts (Typical coarse pitch thread) Dimensions Hole diameter d 0 [mm] Areas Tensile resistance F t,Rd [kN] Shear resistance per shear plane F v,Rd [kN] Bearing resistance per mm of connected plate thickness F v,Rd t [kN/mm] (for e 1 ≥3d 0, e 2 ≥1.5d 0, p 1 ≥3.75d 0, p 2 ≥3d 0) Punching resistance per mm of plate thickness under bolt or nut B …

    Get Price
  • Rocky Regulations

    2020-9-9u2002·u2002A s rock climbing has taken off and rock gyms have skyrocketed in popularity, the number of visitors to Smith Rock State Park has doubled over the last decade, park managers say. Today, fixed hardware, or 'bolts,' fill its rock faces. With so much traffic there, local climbers, historically perceived as law-defying rebels, are welcoming more regulations from the …

    Get Price
  • NC-Bolt and Pc-Bolt EPD final version - Pretec AS

    2019-2-8u2002·u2002bolt: NC-Bolt M20x2.5 (rebar bolt) and Pc-Bolt 27/15 (tube bolt). The main manufacturing processes of the two products are the same. There is only minor difference during the assembling process. A combination bolt is installed for immediate support of rock, anchored by an expansion shell, and to be fully grouted at

    Get Price
  • Productprogram - Pretec

    2019-10-4u2002·u2002Rock bolt M20x3000 HDG 607 104203000 Round steel 4.8/500 for M20x4000 HDG 807 104204000 expansion shell M20x5500 HDG 1110 10420550 Thead: 2xM20x150 Threaded bolt 8.8 Pc-Coat M16x260 Pc-Coat 35 108160260 Bolts for PE-foam, ceiling-and M16x310 Pc-Coat 42 108160310 -wall element etc. ...

    Get Price
  • Rockfall protection mesh - pretec.fi

    Pretec AS – www.pretec.no – Telefon: 69 10 24 60 Innhold kan endres uten forutgående beskjed. Rockfall protection mesh Rockfall protection mesh used as a system to prevent rockfall onto roads and railways. Is used together with rock bolts and other system elements to catch falling rocks from slopes and cuts and prevent falls onto roads

    Get Price
  • Key Features - DYWIDAG-Systems International UK

    Rock Bolts and Meshes. Stabilisation vs. Drapery. Passive Drapery Systems; Stabilisation Systems; Rock Bolts. GEWI ® GEWI ® Plus; Expansion Shell Anchors; Accessories. Bearing Plate; Resins; Grout Sock; Meshes. Key Features; Geocomposites; DYWI ® Mat; Wire Rope; DYWIDAG HCR Stainless Steel; Marine Rock Bolting - Marine Grade Meshes; DYWIDAG ...

    Get Price
  • ZheJiang Pretec Metal Products Co.,Ltd - Company Profile

    Pretec China (ZheJiang Pretec Metal Products Co.,Ltd) was established in June 2010. We produce and sell products for construction and infrastructure industry. Pretec Group operates in Finland, Norway, Sweden and Denmark. Pretec China is the production and purchase center of Pretec Group. We specialize in: Rock support Frost and water proofing;

    Get Price
  • Ekspansjonshylse for bolt til fjell - pretec.no

    2021-6-28u2002·u2002Expansion shell for rock bolt Expansion shells are used with various types of rock bolts, for example combination bolts such as PC and NC bolt. Gives immediately working support and provides excellent anchoring in hard and medium-hard rock types. Stock programme: Thread /type Surface Hole diameter Ø (mm) Weight (kg/pc)

    Get Price
  • Performance of bolting systems in tension and the ...

    2020-7-2u2002·u2002Rock bolt sleeve shear : Double shear test . Determination of the integrity of the rock bolt coated sleeve in shear : One test per vertical displacement of 15, 25 and 25 mm UOW method of double shearing . Tensile failure testing of rock bolts . The tensile strength test involved subjecting the bolt to tension until failure, to determine the

    Get Price
  • RS2

    RS2 (Formerly RS 2 or Phase 2) is a powerful 2D finite element program for soil and rock applications. RS2 can be used for a wide range of engineering projects including excavation design, slope stability, groundwater seepage, probabilistic analysis, consolidation, and dynamic analysis capabilities.. Complex, multi-stage models can be easily created and quickly analyzed – tunnels in weak or ...

    Get Price
  • Table of design properties for metric steel bolts M5 to ...

    1993-1-8u2002·u2002Design properties for metric hex bolts (Typical coarse pitch thread) Dimensions Hole diameter d 0 [mm] Areas Tensile resistance F t,Rd [kN] Shear resistance per shear plane F v,Rd [kN] Bearing resistance per mm of connected plate thickness F v,Rd t [kN/mm] (for e 1 ≥3d 0, e 2 ≥1.5d 0, p 1 ≥3.75d 0, p 2 ≥3d 0) Punching resistance per mm of plate thickness under bolt or nut B p,Rd t ...

    Get Price
  • Rocky Regulations

    2020-9-9u2002·u2002A s rock climbing has taken off and rock gyms have skyrocketed in popularity, the number of visitors to Smith Rock State Park has doubled over the last decade, park managers say. Today, fixed hardware, or 'bolts,' fill its rock faces. With so much traffic there, local climbers, historically perceived as law-defying rebels, are welcoming more regulations from the park—though a recent ...

    Get Price