Just fill in the form below, click submit, you will get the price list, and we will contact you within one working day. Please also feel free to contact us via email or phone. (* is required).
2018-6-13 · in all types of steel structures, of structural joints using high strength bolts conforming to IS 3757 : 1985 CHigh strength structural bolts ( second revision )’ tensioned to the mini mum bolts tension specified in this code. 1.2 This standard applies to high strength
Get PriceICS Code. ICS Number Code 93.020 (Earth works. Excavations. Foundation construction. Underground works) UNSPSC Code. UNSPSC Code 31161632(Rock bolt)
Get Price2010-10-18 · There are eight types of roof bolts used in the South African coal mining industry. These are 1. mechanical anchors; 2. resin point anchors; 3. full-column single-resin-type bolts; 4. full-column slow/fast-resin combination bolts (dual resin system); 5. friction rock stabilisers; 6. wooden dowels; 7. fibreglass dowels; and 8. spin-to-stall resin bolts.
Get Price2016-7-19 · rock bolts, to cement, resin, epoxy, and polyester grouted anchor rock bolts, and to other types of anchored rock bolts. 1.5 Units.-The values stated in SI/metric units are to be regarded as standard. 1.6 Caveats.-This designation does not purport to address all the safety issues associated with its use and may involve hazardous materials,
Get Price2018-4-7 · tensioned bolts or cables with mesh; and sprayed concrete of Steel Fibre Reinforced Shotcrete (SFRS) or steel rib with concrete for the support of a large permanent civil engineering excavation. The philosophy of design of any underground excavation should be to utilise the rock mass itself as the principal
Get Price2021-7-2 · 2.3 Ground Support (Rock Reinforcement and Surface Rock Support) With respect to this Code, the term Ground Support refers to both rock reinforcement and surface rock support. In general, rock reinforcement is primarily applied internally to the rock mass, such as rock bolts, while surface rock support refers to that which is applied externally to
Get Price2021-7-5 · Rock bolting systems are used to stabilize excavated rock mass in underground mines and tunnelling. Rock bolts are systematically arranged to transfer the load from the unstable surface or exterior of the rock, to the much stronger interior part of the rock. The rock mass can be reinforced by different types of rock bolts. Epiroc offers the following Swellex expandable rock bolting systems:
Get Price2005-1-1 · Two types of bolts were tested and discussed in this paper: fully cement grouted 16 and 20 mm diameter bolts, and a frictional hollow bolt (Swellex). In particular, the Swellex dowel, developed and marketed by Atlas Copco [31] , consists of a 41 mm diameter tube, which is folded during manufacture to create a 25–28 mm diameter unit, which can be inserted into a 32–39 mm diameter hole ( Fig. 2 ).
Get Price5.1 Rock bolts are used for support in a variety of mining and civil engineering situations. 3 The pull test may be used to provide a quantitative measure of the relative performance of different anchor systems in the same rock type. Anchor systems may be different mechanical anchors or different bond materials or lengths for grouted anchors.
Get Price2016-7-19 · rock bolts, to cement, resin, epoxy, and polyester grouted anchor rock bolts, and to other types of anchored rock bolts. 1.5 Units.-The values stated in SI/metric units are to be regarded as standard. 1.6 Caveats.-This designation does not purport to address all the safety issues associated with its use and may involve hazardous materials,
Get Price2021-7-2 · 2.3 Ground Support (Rock Reinforcement and Surface Rock Support) With respect to this Code, the term Ground Support refers to both rock reinforcement and surface rock support. In general, rock reinforcement is primarily applied internally to the rock mass, such as rock bolts, while surface rock support refers to that which is applied externally to
Get PriceIt is also known as active rock anchor. Rock bolts are manufactured from TMT grade special steel as per IS:8266/76 specifications in various types. Expansion Shell Type These bolts use expansion shells and plugs made of cast steel with left hand thread, firmly gripping the rock and the bolt forming anchorage. These are made of two types.
Get Price2012-8-29 · MECHANISM OF ROOF BOLTS The principle objective of roof bolting is to help the rock mass support itself. Some researchers have ascribed different support mechanisms to different types of roof bolts. For example, mechanical bolts were originally thought to work in suspension, while resin bolts primarily built beams (4). Others have described
Get Price2021-7-5 · 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.
Get PriceRock bolts have been widely used for rock reinforcement in civil and mining engineering for a long time. Bolts reinforce rock masses through restraining the deformation within the rock masses. In order to improve bolting design, it is necessary to have a good understanding of the behaviour of rock bolts in deformed rock masses.
Get Price2012-9-17 · Numerical Simulation of Fully Grouted Rock Bolts 609 Two nodes are connected to the bolt and six to the rock mass. The use of boundary element and FE techniques to analyse the stress and deformation along the bolt was conducted by Peng and Guo (1992) (Figure 3). The effect of the face plate was replaced by a boundary element.
Get PriceThe rock bolts used in tunnel excavations are mostly untensioned grouted bolts, and this type of bolt is the main focus of this work. From the model of the grouted bolt, other types of rock bolts can also be modelled by the theory presented herein.
Get Price2018-11-14 · Foundation bolts are designed for use in masonry, concrete foundation and the like. The form of the shank is optional but compliance is required for the maximum dimensions specified (space requirement dimensions ). The standard specifies property class 4.6 for foundation bolts as the bolts
Get Price2018-11-14 · method for conducting pull-out test on anchor bars and rock bolts is a full-column-grouted rock bolt or bar with cement-sand grout or resin and rock bolt is ungrouted mechanically anchored bolt. The anchorage may be of any type that is lot wedge type, expansion shell type, etc. 0.3 In reporting the result of a test or analysis made in ...
Get PriceTable 4–13 Fracture type 4–21 Table 4–14 Fracturing density description chart 4–21 Table 4–15 Joint set spacing categories 4–22 Table 4–16 Aperture category 4–23 Table 4–17 Joint infilling 4–24 Table 4–18 Joint persistence categories 4–25 Table 4–19 Types of joint ends 4–25 Table 4–20 Descriptors for weathering condition of joint face rock 4–27
Get Price2012-2-21 · Bolting Principles Critical Parameters Types of Bolts Grouting Mechanism of Fully Grouted Rock Bolts Effect of Water/Cement Ratio Types of Cement Grouted Rock Bolts How to Install Cement Grouted Rock Bolts Conclusion 2 Beam building
Get PriceBecause of the high-quality properties of the steel we use (S355 MC) and the technology and automation of our production processes we guarantee the best quality and service. Currently we provide three types of expend rock bolts: STANDARD, MIDI and SUPER. The main difference between them are the thickness, diameter and breaking load.
Get PriceRock bolts are useful tools for excavations and construction jobs around the world. While many countries have different applications for these items, the main principle remains the same. The goal of a rock bolt is to provide support for digging, mining, or tunneling by placing the anchor into a hole workers drill into the surface of the rock or ...
Get PriceThe rock bolts used in tunnel excavations are mostly untensioned grouted bolts, and this type of bolt is the main focus of this work. From the model of the grouted bolt, other types of rock bolts ...
Get PriceRock reinforcement utilizes the inherent property of the rock structures to behave like a self-supporting single unit. Rock reinforcements can be provided in the form of rock bolts, rock anchors or rock dowels. The need and types of rock reinforcement are briefly explained in this article.
Get PriceThe bond strength is the mobilized shear resistance along the rock-grout interface. From experience, it is known that for drilled and grouted anchors, the bond strength is affected by the: size of the grouted zone. As previously mentioned, the case of anchorages installed in rock and gravity grouting will be discussed.
Get Price2018-11-14 · Foundation bolts are designed for use in masonry, concrete foundation and the like. The form of the shank is optional but compliance is required for the maximum dimensions specified (space requirement dimensions ). The standard specifies property class 4.6 for foundation bolts as the bolts
Get Price2021-7-5 · 2.3 Ground Support (Rock Reinforcement and Surface Rock Support) With respect to this Code, the term Ground Support refers to both rock reinforcement and surface rock support. In general, rock reinforcement is primarily applied internally to the rock mass, such as rock bolts, while surface rock support refers to that which is applied externally to
Get Price2021-7-1 · Hex Bolts Carriage Bolts Lag Bolts Bolts with a hexagonal head with threads for use with a nut or tapped hole. Abbrevi-ated HHMB or HXBT. Bolts with a smooth rounded head that has a small square section underneath. Plow Bolts Similar to carriage bolts but used for attaching the cutting edge of a plow to the plow blade. Bolts with a wood thread and
Get Price5.1 Rock bolts are used for support in a variety of mining and civil engineering situations. 3 After a bolt is installed, the load generally decreases over time due to deterioration of the borehole wall, creep, and other factors. This process may be arrested by fully encapsulating the bolt shortly after installation.
Get PriceDSI Underground Rock Bolt Couplings are manufactured from higher tensile material and will equal the tensile strength of the bolts if installed correctly. Corrosion protection may be provided by hot dip galvanizing or zinc plated to AS 1789-1984. DSI Underground Mining Products Division is Quality Assured to ISO 9001:2015, Registration QMS 41328.
Get PriceRock bolt assemblies are packaged as complete, ready-to install units and are used for anchoring, roof stabilisation, rock surface control and structural reinforcement. Advantages. High shear strengths. Combination of cold rolling and DIN 405 profile ensures that no strength is lost in the threaded zone. Numerous bar options and accessories ...
Get PriceResin bonded anchor bolts are one of the most economical temporary rock anchor systems available. 3. Resin anchoring is successful in most rock types. Disadvantages. 1. Resin anchors are difficult to protect against corrosion. They require tight drill holes for propermixing of …
Get PriceRock reinforcement utilizes the inherent property of the rock structures to behave like a self-supporting single unit. Rock reinforcements can be provided in the form of rock bolts, rock anchors or rock dowels. The need and types of rock reinforcement are briefly explained in this article.
Get Price2015-10-9 · Identification Charts for Different Types of Fasteners: Head styles, Bolt and Screw, Drive, Washer and Nut types A fastener is a hardware device that is used for creating non-permanent joints. Fasteners can be used to close a container of a box or an envelope, or they may involve keeping together the sides of an opening of flexible material ...
Get Price1. Introduction to bolts 2. Classification of bolting material 3. Applications of bolts 4. Dimensional standards for bolts Introduction to bolts: The flanges are drilled to receive bolts which, if of the proper material, will develop the full flange strength and result in a satisfactory joint at the service intended.
Get Price2020-6-19 · Rock Bolts Expansion Rock Anchor Bolts Resin Anchor Bolt: The rock bolt is a unique and highly advanced bolt that can absorb rock movements with excellent predictability. It is designed to dissipate and control large amounts of energy liberated from the rock mass deformation process.
Get Price2015-10-9 · Identification Chart for Types of Fasteners – Bolt and Screw Wood Screws, Machine Screws, Thread Cutting Machine Screws, Sheet Metal Screws, Self Drilling SMS, Hex Bolts, Carriage Bolts, Lag Bolts, Socket Screws, Set Screws, Eye Bolts, Eye Lags, J-bolts, U-Bolts, Shoulder Bolts, Elevator Bolts, Sex Bolts, Mating Screws and Hanger Bolts
Get Price2021-7-1 · nut or in a tapped hole. Certain types are some-times referred to as stove bolts. Socket screws are machine screws with an internal hex socket (Allen) drive. Longer lengths may have a smooth shank. Lag bolts, or lag screws, are large wood screws with hex heads. Typically used for …
Get Price2020-6-24 · EMCOR Underground is a leading mining and tunnelling support family-owned company based in Oviedo, Spain. Since the beginning our mission has been focused on manufacture high quality support products. Today we focus our activity on manufacturing rock bolts, our industry experience leads us to build the most technological and innovative rock bolt factory in the word.
Get PriceBoth types are fastened to rock faces with bolts and washer plates. Mesh is exceptionally effective at retaining loose material while letting moisture and gasses dissipate. TM International Blast Shields : Blast shields and blasting mats haven’t frequently seen use in …
Get Price2019-10-12 · Types of bolts. Writer： admin Time：2019-10-12 22:02 . Bolts are used with nuts and often with washers. The three basic types are carriage bolts, stove bolts, and machine bolts. Other types include the masonry bolt and anchor, toggle bolt, and expansion bolt, which are used to distribute weight when fastening something to a hollow wall.
Get Price1. Introduction to bolts 2. Classification of bolting material 3. Applications of bolts 4. Dimensional standards for bolts Introduction to bolts: The flanges are drilled to receive bolts which, if of the proper material, will develop the full flange strength and result in a satisfactory joint at the service intended.
Get Price2011-6-16 · Before placing bolts in a cliff you must practice at home. Find a piece of stone, a boulder or use your garages cement foundation as a test block. Practice drilling, notching, placing and removing an example of all these types of bolts before deciding on a system. Remember - do not trust the guys in the bolt shops to tell you the right information.
Get Price2021-6-25 · Related Topics . Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more; Fasteners - Bolts, nuts and threaded rods - torque, tension and loads; Related Documents . ASME/ANSI B16.5 - Flanges and Bolt Dimensions Class 150 to 2500 - Diameters and bolt circles for standard ASME B16.5 flanges - 1/4 to 24 inches - Class 150 to 2500
Get Price2015-3-17 · Abstract. In this paper, a robust geotechnical design (RGD) methodology is applied to design of rock bolts for slope stabilization. In rock engineering practice, the variation of shear strength characteristics of rock discontinuities is often quite difficult to ascertain. The RGD methodology is utilized to achieve a certain level of design ...
Get Price2020-10-10 · Our goal was to develop an effective research tool for roadways with significant deformations supported by rock bolts. The improved numerical simulation approach is constructed through additional development of FLAC3D. The aim is to modify the shortcoming that the original model in FLAC3D regards the plastic tensile strain of any arbitrary rock bolt element node as the rupture …
Get PriceJENNMAR offers a complete line of cable support products. These products are based on 7-strand, high-strength cable. JENNMAR offers an industry-leading line of cable products including: non-tensioned cables, post-tensioned cables, tensionable cables for primary roof …
Get Price