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  • VSL soil and rock anchors - STRUCTURAL TECHNOLOGIES

    2020-7-6 · (such as EMPA). In addition, VSL (Switzerland) Ltd. also has an ISO 9002 quality management system. Characteristics of VSL anchors VSL anchors are strand anchors. As grouted anchors, they can be used in both rock and soil. Their con-struction principle is always the same and the various types of anchors only differ in certain technical details.

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  • VSL GROUND ANCHOR SYSTEMS

    Soil nails, rock bolts, micropiles The VSL Bar system, which is available in B500 and S670 grades and diameters up to 75mm, is used for soil nails, rock bolts, micropiles and similar applications. The corrosion protection depends on the required service life, the consequences of failure of a group of anchors and on prevailing environmental conditions. VSL

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  • Bar systems | VSL

    Rock bolts are used to stabilise galleries during excavations and stabilise unstable rock and soil. They are supplied with different anchoring systems, grouted, with resin or mechanical anchors. They are supplied with Ø 20 mm – Ø 36 mm and ultimate loads of 175 kN – 560 kN.

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  • Ground anchors | VSL specialized leader

    VSL uses specially designed mechanisms to extract free lengths and even bond lengths. VSL Permanent strand ground anchors Permanent anchors are functional throughout the entire working life of the structure and require comprehensive corrosion protection.

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  • VSL Ground anchor systems

    Soil nails, rock bolts, micropiles The VSL Bar system, which is available in B500 and S670 grades and diameters up to 75mm, is used for soil nails, rock bolts, micropiles and similar applications. The corrosion protection depends on the required service life, the consequences of failure of a group of anchors and on prevailing environmental conditions.

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  • Optimization of Rock Bolt and Concrete Lining

    2021-7-16 · The result shows that the optimum combination can be found by increasing the number of rock bolts. The finite element analysis gives a total displacement of 6.34 cm in the best scenario case, which is slightly greater than the observed total displacement of about 6 cm.

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  • Swellex Rock Bolting System | Rock Reinforcement |

    2021-7-28 · Designed as a daily support to provide safety and productivity for optimum control of the rock mass in mining and tunnelling. Made from specially engineered steel, these rock bolts offer high yielding and breaking load while perserving good elongation properties for safety.

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  • Optimum Industrial Sales – Wholesale Bolts and Nuts ...

    2021-7-23 · [email protected] Globe 0917-1788806 Smart/Sun 0922-8820242/0922-8820240/0933-8147334 Fax-(632) 411-6727 PHONE-(632) 921-7746 (632) 376-6466 (632) 514-7024 (632) 351-8951 (632) 415-8787 (632) 411-6727 (632)718-3501

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  • Slot and Wedge Bolt - 24mm - DSI Underground

    Using both the thrust of the machine and full impact the bolt is driven onto the wedge to set the bolt. The spanner is then changed and the nut rotated to tighten the bolt. Standard Lengths & Packaging. Standard bolt lengths range from 600 to 3000mm in 300mm increments.

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  • Thesis Summary EXPERIMENTAL AND COMPUTATIONAL

    2021-1-14 · Rock bolts are essential supports for both mining and civil engineering during excavation of tunnels or large rock caverns and a slope stabilization process. Rock bolting system has been dramatically developed over the last four decades in the area of understanding the reinforcement mechanism of rock bolts and advancement of rock bolting

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  • Creating VSL Rock Bolts

    VSL CEME Issue October 1999 Creating Solutions Together VSL Rock Bolts - Information leaflet - Dom Nut Anchor plate Cement grout Resin Injection Expansion shell . Title: VSL …

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  • Optimum Industrial Sales – Wholesale Bolts and Nuts ...

    2021-7-23 · Wholesale Bolts and Nuts Supplier Philippines . Welcome to Optimum Prime Industrial Sales Corporation! We invite you to browse the pages of our website to find out more about our quality products at competitive prices. This website has been designed to give you a brief overview of our company.

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  • Bar systems | VSL specialized leader

    geotechnical systems such as soil nails, micropiles and rock bolts; concrete reinforcing systems, post-tensioning systems, marine-tie rod systems, anchors and form-tie systems. The VSL product line complies with international standards, including ISO, Eurocodes, ASTM, …

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  • Swellex Rock Bolting System | Rock Reinforcement |

    2021-7-28 · Rock bolts. Since its introduction 30 years ago the Swellex expandable rock-bolting system has gained wide recognition in the mining and tunneling industry. This unique rock bolt consists of a welded tube folded in upon itself, sealed at one end. It is re-expanded using a high pressure water flow provided by a special pump and adapter.

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  • DYWIDAG Geotechnical Product Range

    2020-9-24 · GEWl® Soil and Rock Bolts DYWI® Drill Soil and Rock Bolts Slope Stabilization and Sidehill Cuts The development and expansion of infrastructure – and, more specifically, the construction of high-speed corridors – poses significant requirements in terms of route planning. The expansion of motorways by adding more lanes often

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  • Non-destructive testing of rock bolts using guided ...

    2003-6-1 · Rock bolts are steel studs that are fixed into the roof to prevent the movement and expansion of rock strata, hence improving the stability of the roof. There is a considerable amount of strata movement data available to estimate the condition of rock bolts, but there is currently no effective non-destructive test for their integrity.

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  • Stabilization of Rock and Soil Slopes by Anchoring ...

    1983-1-1 · The bolts are regularly distributed on the slope at a maximum density of one bolt per 4 m 2 of the rock face. The bolts are of the deformed bar type, with a minimum diameter of 20 mm, and a thread at the external end. They are inserted into boreholes 34 to 38 mm in diameter and grouted with a thin grout along their entire length.

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  • AnalyticalStudyoftheConfiningMediumDiameterImpacton

    2011-8-14 · VSL Bar Central Hidroeléctrica Porce III, Colombia - 2005 Soil nails, rock bolts, micropiles The VSL Bar system, which is available in B500 and S670 grades and diameters up to 75mm, is used for soil nails, rock bolts, micropiles and similar applications.

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  • Anchoring systems for geotechnical engineering

    2021-4-24 · of rock bolts can be plotted, representing the performance of rock bolts. For example, Skrzypkowski et al. [11] considered that the load-carrying capacity of segmentally installed rock bolts can be influenced by the bolting hole diameter. To investigate this impact, they conducted pulling tests on rock bolts with a diameter of 24mm.

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  • AMERICAS

    The cartridge is designed for rapid insertion into a wide range of diameter and length boreholes. The system permits the placing of bolts in any position or angle above or below the horizon. Therefore, optimum bolt anchorage is possible in a wide range of concrete structures or rock strata by easily adjusting the length of the resin anchor zone.

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  • FRP Solid Rock Bolt | Cut-able composite Rock Bolt -

    2021-7-14 · GEOTEC™ FRP Solid Rock Bolt is a rock-bolting system based on fully threaded GFRP tendon. It is especially designed for the following applications: Face-bolting and temporary applications: Cut-ability of FRP makes it the ideal solutions for face bolting or any other tunneling/mining application where further excavation is required.

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  • VSL PT Bar Montage - Coroflot

    2010-1-28 · products and services, VSL offers threaded bar systems for concrete reinforcing, anchors, and form ties, as well as geotechnical applications, such as soil nails, micropiles, and rock bolts. VSL bars have continuous cold-rolled threads in full 60-foot stock lengths, or as cut to project requirements. VSL’s

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  • AnalyticalStudyoftheConfiningMediumDiameterImpacton

    2021-4-24 · of rock bolts can be plotted, representing the performance of rock bolts. For example, Skrzypkowski et al. [11] considered that the load-carrying capacity of segmentally installed rock bolts can be influenced by the bolting hole diameter. To investigate this impact, they conducted pulling tests on rock bolts with a diameter of 24mm.

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  • Verification of the Analytical Model for Fully Grouted ...

    Abstract A new analytical approach able to predict the mechanical behavior of rock bolts subjected to pull-out tests was proposed in this paper. Input parameters of such approach are: rib profile shape, height, width, angle of wrap and spacing, axial bolt pull-out force, and material properties. As for the analytical part, the basis of the new analytical solution for the prediction of the load ...

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  • Anchoring systems for geotechnical engineering

    2017-4-19 · In mines - The bolts reinforce the roof of the cavity to recreate a beam effect with the natural earth. On cliffs - The bolts stabilise the blocks to limit erosion. They can also be used to anchor the stone and rockfall mesh. In tunnels - The bolts reinforce the natural earth on the roof to create an arched effect. Soil nails & rock bolts

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  • Understanding Wet-Mix Shotcrete: Mix Design ...

    2020-1-23 · combination with rock bolting and/or steel sets or lattice girders. In this case, shotcrete is structural in the sense that it offers support between the rock bolts and the steel sets or lattice girders. This type of support is intended to provide local stability of the excavation and prevent fallouts of blocks of rock.

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  • System Description - DSI USA - dsiamerica.com

    DYWIDAG-Systems International (DSI) offers a complete product line in strand and bar post-tensioning (bonded, unbonded and external) as well as stay-cables and is thus able to fully serve the post-tensioning construction industry. DYWIDAG Post-Tensioning Systems have always combined the highest safety and reliability standards with the most ...

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  • Post-Tensioning System and Prestressing Steel Bars

    2020-4-20 · 2 The Williams System Williams Prestressing Post-Tensioning Systems consist of high tensile steel bars available in seven diameters from 1” (26 mm) to 3” (75 mm) with guaranteed tensile strengths to 1027 kips (4568 kN).

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  • Surrounding Rock Deformation Mechanism and

    2017-5-14 · The array pitch of the bolts along the length of the roadway was 800 mm. The spacing along the height of the RBB was 900 mm. A steel ladder beam of length 3000 mm was placed along the height of the RBB between the bolts as shown in Figure 14. (3) The diameters of the bolts used for entry-in support were 22 mm and their lengths were 2400 mm. The ...

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  • DS411 ROCK SUPPORT BOLTER

    10 rock bolts for square plate 120 mm 12 rock bolts for square plate 100 mm 16 rock bolts for square plate 85 mm Bolting option *Bolting alternatives ... Optimum operating height B 5 400 Maximum operating height C 500 500 500 500 500 500 B C 7 580 6 890 CORNERING (LEFT) Angle (A) Internal radius (R1) External radius (R2)

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  • Anchoring systems for geotechnical engineering

    2017-4-19 · In mines - The bolts reinforce the roof of the cavity to recreate a beam effect with the natural earth. On cliffs - The bolts stabilise the blocks to limit erosion. They can also be used to anchor the stone and rockfall mesh. In tunnels - The bolts reinforce the natural earth on the roof to create an arched effect. Soil nails & rock bolts

    Get Price
  • Effect of bolt rib spacing on load transfer mechanism

    2020-10-13 · of rock bolting and advances made in the bolt system technology [1]. In 2011, around 66% of nearly 97 million roof bolts installed in United States coal mines were fully grouted resin bolts [2]. Rock bolts used for rock formation reinforcement in mining industry is developed from ribbed steel tendon used in …

    Get Price
  • Understanding Wet-Mix Shotcrete: Mix Design ...

    2020-1-23 · combination with rock bolting and/or steel sets or lattice girders. In this case, shotcrete is structural in the sense that it offers support between the rock bolts and the steel sets or lattice girders. This type of support is intended to provide local stability of the excavation and prevent fallouts of blocks of rock.

    Get Price
  • Tunneling - DSI Underground Australia - Rock Bolts

    System Solutions for Tunneling – well-proven Systems over Decades. As a system supplier, we develop, produce and supply the entire product line of excavation and ground support systems for Tunneling. Our innovative products and systems have an excellent reputation around the world. With a large variety of anchors, rock bolts, passive supports ...

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  • Post-Tensioning Systems – Williams Form Engineering

    Williams’ Post-Tensioning System. Williams PreStressing Post Tensioning Systems consist of high tensile steel bars available in seven diameters from 1” (26 mm) to 3” (75 mm) with guaranteed tensile strengths to 1027 kips (4568 kN). They are provided with cold-rolled threads over all or a …

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  • X-ROCK MM - Acerbis USA

    2021-7-25 · Product Information. Cut and abrasion-resistant leather and microfiber uppers. Hinge in the ankle area. Protection of the shinbone with upper and lower anatomically-shaped shin guards. Shaped heel guard to make changing gears easier when starting. Protection of the midfoot and toe area in plastic with ribbing for improved impact absorption.

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  • Coal Mining | JENNMAR

    Technical Data and Dimensions for 40 lb., 60 lb., 85 lb., and 115 lb. rail sections. JENNMAR offers a complete line of steel and iron clad ties to the mining and tunneling industries. We can engineer our ties to meet your specific haulage application. Our ties can be designed for any type of rail and gauge.

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  • Mining Supplies | NISS

    Mining Supplies Get A Quote What We Do Ground Support Power Distribution Ore Movement & Processing What We Do Ground Support Power Distribution Ore Movement & Processing NISS Manufacturing When you need high-quality, innovative tooling and wear items to keep your productivity promises, count on our manufacturing to deliver when and where you need it.…

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  • Railways complete the Arch closure of the iconic

    2021-4-5 · Railways complete the Arch closure of the iconic Chenab Bridge, World's highest Railway Bridge The Arch looms over Chenab, flowing 359 metres below Arguably the biggest civil-engineering challenge faced by any railway project in India in recent history Major Leap towards completion of the Katra- Banihal section

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  • Post-Tensioning | STRUCTURAL TECHNOLOGIES

    STRUCTURAL TECHNOLOGIES is the exclusive manufacturer of VSL post-tensioning products and construction systems in the United States. VSL systems have a well-earned reputation for their quality, reliability, and durability – and have been used throughout the world since 1956 to build, repair, and strengthen buildings, tanks, transportation and special structures.

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  • AMERICAS

    The system permits the placing of bolts in any position or angle above or below the horizon. Therefore, optimum bolt anchorage is possible in a wide range of concrete structures or rock strata by easily adjusting the length of the resin anchor zone.

    Get Price
  • A New Rock Bolt Design Criterion and Knowlwdge

    The impact of the number of strata layers within bolting range and pretension applied to bolts upon the stability of an opening was investigated using FLAC model. Four statistical models for predicting optimum bolt supports using a minimum solid beam thickness were established, and based on these results, a design criterion was proposed.

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  • Effect of bolt rib spacing on load transfer mechanism

    2020-10-13 · of rock bolting and advances made in the bolt system technology [1]. In 2011, around 66% of nearly 97 million roof bolts installed in United States coal mines were fully grouted resin bolts [2]. Rock bolts used for rock formation reinforcement in mining industry is developed from ribbed steel tendon used in …

    Get Price
  • 5.7L, 6.1L, 6.4L VOLUME 1 - arp-bolts.com

    2019-2-25 · steel or black oxide finish 8740 chrome moly steel bolts that have an underhead length of 1.181” for use with 5.7L and 6.1L Hemi engines. The reduced wrenching 12-point or hex heads provide extra socket clearance in tight quarters. 140-1101 – Black Oxide Hex header bolts (set of 16) 140-1201 – Black Oxide 12-point header bolts (set of 16)

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  • CT-Bolt - DSI Civil

    CT-Bolt System Description. Combination rock bolt. Application as temporary and long-term ground control system. Immediate point anchorage in terms of an expansion shell anchor. Post-grouting assembly features double corrosion protection. Fully automated or manual bolt installation. 1. Nut.

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  • Coal Mining | JENNMAR

    Technical Data and Dimensions for 40 lb., 60 lb., 85 lb., and 115 lb. rail sections. JENNMAR offers a complete line of steel and iron clad ties to the mining and tunneling industries. We can engineer our ties to meet your specific haulage application. Our ties can be designed for any type of rail and gauge.

    Get Price
  • Home - Underground Support Solutions

    Underground Support Solutions (PTY) LTD Underground Support Solutions (PTY) LTD is a company that branched out of Underground Solutions (PTY) LTD which started in August 2006, servicing coal mine industry by conveyor belt maintenance, including construction and reclaiming. During this time secondary support service was also started and in nearby future primary support will also […]

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  • UKC Gear - COMPETITION: WINNER - Mountain

    2021-4-19 · Dihedral Pant, Dihedral Women's Pant and Dihedral Women's Crop Pant. Comfortable stretch pants for year round climbing performance on sea cliffs and immaculate limestone walls. With our tailored Climbing fit and stretch fabric these are the optimum pant for everything from clipping bolts on sun baked cliffs to placing questionable cams above crashing waves.

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  • New Austrian Tunneling Method (NATM): Design and

    ? 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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