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Introduction
Published in Charles Aubeny, Geomechanics of Marine Anchors, 2017
General factors to be considered in selection of the most appropriate anchor for a given situation include the ability to install the anchor in the soil profile under consideration, load resistance characteristics of the anchor, anchor efficiency and cost, and the ability of the anchor to maintain its embedment under sustained or cyclic loading. Recognizing that local project specific factors—equipment availability, vessel availability, environmental constraints, etc.—can be important if not decisive considerations, the following discussion provides an overview of general considerations guiding anchor selection.
Stabilization of rock slopes
Published in Duncan C. Wyllie, Christopher W. Mah, Rock Slope Engineering, 2017
Duncan C. Wyllie, Christopher W. Mah
Methods of securing the distal end of an anchor in the drill hole include resin, mechanical, and cement grout anchors. The selection of the appropriate anchor will depend on such factors as the required capacity of the anchor, speed of installation, strength of the rock in the anchor zone, access to the site for drilling and tensioning equipment, and the level of corrosion protection required. The following is a brief discussion of each of these anchorage methods.
Manufacturing and automation as a recovery path toward sustainable growth
Published in Harish Hirani, Technological Innovations for Effective Pandemic Response, 2023
Anchor bolts are primarily employed to attach objects to the concrete [18]. One side of the anchor bolt is anticipated to be fixed in concrete while the other side is kept projected from the concrete for anchoring objects. Depending on the object type and load, anchor bolt ends particularly the fixed end in concrete are required to be designed [19]. It follows the standard ASTM F1554-18.
Vertical uplift resistance of an innovative plate anchor embedded in sand
Published in Marine Georesources & Geotechnology, 2021
Mohsen Sabermahani, Mehrzad Shojaee Nasirabadi
Anchors are light structural members used to support structures such as transmission towers, anchored bulkheads, submerged pipelines and offshore floating platforms against uplift forces. The types of anchors include mechanical anchors (pile, drag, plate, helical and deadman anchors), grouted anchors and combinations of these types (Das and Shukla 2013; Sabatini, Pass, and Bachus 1999). One of the most applicable anchors that are implemented to resist uplift forces for light structures is mechanical plate anchor. Parameters such as the type, shape, size, depth and inclination of the anchor and subsoil conditions can affect anchor pullout capacity. Therefore, the required pullout capacity of a plate anchor system can be increased with an increase in the anchor size and depth or by improving backfill conditions such as density and strength (Kumar and Bhoi 2009; Liu, Liu, and Zhu 2012; Ganesh and Sahoo 2016; Ouria and Mahmoudi 2018). Table 1 summarizes the vital parameters of such anchors and their effects on plate anchor uplift capacity.
Effect of hollow bit local exhaust ventilation on respirable quartz dust concentrations during concrete drilling
Published in Journal of Occupational and Environmental Hygiene, 2019
David Rempel, Alan Barr, Michael R. Cooper
Large diameter holes (1–3 cm diameter) are drilled into concrete in commercial construction for structural upgrades (e.g., dowel and rod drilling) and for inserting anchor bolts for hanging pipes, conduit, or equipment. For dowel and rod drilling, a hole is drilled, then thoroughly brush-cleaned before epoxy is injected into the hole and rebar or dowel is inserted. For anchor bolts, the hole is drilled then the anchor bolt is pounded into the hole and tightened so that a wedge expands the insert and secures the bolt in the concrete. Anchor bolts can also be secured with epoxy or they can be screwed into concrete. Industrial construction projects may require thousands of these holes to be drilled, and this work can generate high concentrations of respirable silica dust, concentrations well in excess of the ACGIH Threshold Limit Value (TLV) of 0.025 mg/m3,[1] depending on the drill used, size of hole drilled, frequency of drilling, and environmental conditions.[2–6] Respirable silica dust can cause silicosis and lung cancer; [7] therefore, US OSHA recently reduced the permissible exposure limit (PEL) to 0.05 mg/m3.[8]
Introducing expandable mechanical plate anchors for onshore and offshore anchoring
Published in Marine Georesources & Geotechnology, 2022
Matin Jalali Moghadam, Nader Dastaran, Amirali Zad
From the EMPLA-2 uplift diagram, it can be inferred that the maximum tensile load capacity occurs in this anchor as it can withstand 2.5 kN of tensile bearing capacity. This might be related to the quick expansion of plates during the displacement of less than 15 cm compared to EMPLA-1. Consequently, it leads to the low level of soil particle escape over the plates compared to the other two anchors (i.e., EMPLA-3 and EMPLA-4). The most important parameter that affects the maximum capacity is the lower level of soil particle escape over the plates due to the insignificant curvature of plates (15°) compared to the other two anchors (i.e., EMPLA-3 and EMPLA-4). Moreover, the embedded depth of EMPLA-2 can be considered as an effective parameter in this regard.