Chain drag test
WebWhen discussing conveying chain, catenary sag refers to the hanging shape the sagging chain takes after leaving the drive sprockets. Pro-actively checking the catenary sag of your chain can increase drive efficiency, identify chain elongation and help predict chain removal or replacement. We recommend that all conveying chains are run with a ... WebJun 1, 2003 · The chain drag method involves dragging a chain across the bridge deck surface while listening for changes in the acoustic response. This method involves only a qualitative assessment, but is rapid and inexpensive. IE is frequently used when a more thorough acoustic assessment is needed [3].
Chain drag test
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WebThe chain drag method for inspection is a nondestructive method that involves dragging chains across the surface of a bridge deck and listening to audible sounds produced by the vibrating chains. From: Sensor Technologies for Civil Infrastructures , 2014 WebMar 15, 2016 · One person initially drags the chain and hear the dull sound over the deck while the second person further clarify the boundaries of the defected areas with the help of rock hammer and record the findings. A clear ringing sound represents a sound deck while a muted or hollow sound represents a delaminated deck.
WebApr 1, 1990 · Chain drag surveys are particularly effective in locating shallow delaminations on uncovered decks. The method can't be used to locate delaminations in the concrete below bituminous wearing surfaces, although debonding between wearing surface and underlying concrete can generally be detected by a chain drag survey. Webdrag chain: [noun] a chain that drags: such as. a chain for coupling freight cars. a metal conveyor belt for removing the clinker from a cement kiln. a chain that is attached to the chassis of a motor vehicle (as a gasoline tank truck) and drags on the roadway to ground the chassis and prevent accumulation of static electricity.
WebThe chain drag method is not as effective in detecting smaller delaminations. These smaller areas are typically found by tapping with a small hammer. The chain drag as described in ASTM D 4580-86 is useful for initial delamination detection on large, flat surfaces, such as bridge and parking decks, and some concrete highway slabs. Web1.2.2 Procedure B, Chain Drag— This procedure consists of dragging a chain over the bridge deck surface. The detection of delaminations is accomplished by the operator noting dull or hollow sounds. Tapping the bridge deck surface with a steel rod or hammer may be substituted for the chain drag.
WebJul 17, 2024 · Chain drag testing is a common practice for bridge deck evaluation owing to its low cost and ease of use. Delaminations in bridge decks are identified by hollow sounds when steel chain is dragged on deck surface.
WebSep 11, 2014 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ... lupoid dogWebA steel chain can also be dragged over the surface under evaluation. This method is best suited for slab surfaces where large areas can be tested in a reasonable amount of time. Non-destructive evaluations is also … lupo iluminacionWebThe chain drag method is not as effective in detecting smaller delaminations. These smaller areas are typically found by tapping with a small hammer. The chain drag as described in ASTM D 4580-86 is … lupo imobiliariaWebThe chain drag test does not provide quantitative and achievable data, and its interpretation relies on the operator’s judgment. To address these drawbacks of the chain drag test, the authors recently developed a multi-channel acoustic scanning system that integrates air-coupled sensing with continuous impact excitation using ball-chains [11,12]. lupoi maurizioWebFeb 11, 2024 · As the name would suggest, a chain drag survey involves dragging a folded length of chain over a concrete surface. Concrete has different audible qualities based on its condition. Defective concrete will produce a hollow sound compared to the much more solid, richer sounding timbre of good quality concrete. lupo immagineWebMay 1, 2024 · The chain drag test does not provide quantitative and achievable data, and its interpretation relies on the operator’s judgment. To address these drawbacks of the chain drag test, the authors recently developed a multi-channel acoustic scanning system that integrates air-coupled sensing with continuous impact excitation using ball-chains [ 11 ... lupo immagine disegnoWeb2.1.3 Chain drag survey For concrete bridge decks without an asphalt overlay, the standard test for detecting delaminations in concrete bridge decks is ASTM D 4580-86. This test covers a variety of techniques for detecting delaminations using sounding, but the dominant method in use in the field is the chain drag test. lupo immagini per bambini