Combination of Scour Protection Devices Around Oblong Bridge Pier

M.Ish, Vikas Garg; Setia, Baldev; M.Ish, D. V. S. Verma

doi:10.1080/09715010.2008.10514922

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…It is reported that the collar plate did not significantly minimize scour depth when the bridge pier was placed in the transverse position (Zarrati et al 2006). • The vanes and collar plates were the best combination for reducing scour depth, and using various protection devices was better in all respects than using a single device (figure 7(e)) (Garg et al 2008).…”

Section: Countermeasure Techniques Based On Combined Flow-altering De...mentioning

confidence: 97%

“…Therefore, it is crucial to countermeasure the scouring process. Previous researchers have conducted extensive investigations to reduce local scouring around the bridge pier by providing various countermeasure techniques such as bed armouring and flowaltering devices (Isbash 1935, Breusers et al 1977, Patel and Ranga Raju 1999, Garg et al 2008, Link et al 2019, Garg et al 2022, Singh et al 2022, Valela et al 2022. One possible approach to reduce local scour depth around a bridge pier is to use countermeasures techniques such as riprap, gabions, or articulated concrete block systems, which can dissipate the energy of the flowing water and protect the soil around the pier.…”

Section: Available Countermeasure Techniques To Reduce the Scouring P...mentioning

confidence: 99%

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Scouring around bridge pier: a comprehensive review of countermeasure techniques

Baranwal,

Das

2024

Eng. Res. Express

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Scouring around bridge piers significantly threatens bridge stability and can cause tragic failures if not addressed effectively. Several remedial techniques have been developed to reduce local scour depth around bridge piers, including using scour countermeasures such as riprap, collar plate, slot, submerged vane, sacrificial pile, etc. These countermeasures can be used alone or in combination to provide additional protection against local scour. The selection of countermeasures depends on flow velocity, river bed sediment type, and bridge geometry. A thorough analysis of these factors is necessary before selecting a countermeasure. In this paper, an attempt has been made to summarize the efficiency of different remedial techniques to reduce scour depth around the bridge pier. The stability of the bed armouring device depends on its depth and installation position around the bridge pier, and its efficiency decreases as flow velocity increases. It is found that significant scour protection devices are more efficient in clear water scouring (CWS) conditions (V/Vc1.0) than live bed scouring (LBS) conditions (V/Vc>1.0). The combination of flow-altering devices is crucial in reducing scour, with a collar plate and slot combination being more effective than a single slot. The findings of this review paper are to provide a valuable resource for engineers and policymakers seeking to design and implement effective strategies for mitigating local scour around bridge piers.Keywords: Local scour, bridge pier, remedial technique, bed armouring devices, flow-altering devices

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Section: Countermeasure Techniques Based On Combined Flow-altering De...mentioning

confidence: 97%

Section: Available Countermeasure Techniques To Reduce the Scouring P...mentioning

confidence: 99%

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Baranwal,

Das

2024

Eng. Res. Express

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“…They observed that incorporating tow methods resulted in 50% and 60% scour reduction in front and rear piers, respectively; however, using collar independently reduced scour depth by 25% and 30% for front and rear piers. Garg et al [36] employed sleeve, collar and submerged vanes to protect a bridge pier against local scour. They reported that the combination of these techniques is more effective than using them individually, so that incorporating vanes with collar and vanes with sleeves reduces scour depth by 86% and 70%, respectively, in comparison with applying vanes, collar and sleeves which resulted in 57%, 78% and 39%.…”

Section: Introductionmentioning

confidence: 99%

Combination of Riprap and Submerged Vane as an Abutment Scour Countermeasure

Fathi

Zomorodian

Zolghadr

et al. 2023

Fluids

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Scour is one of the main causes of hydraulic structural failures. The present experimental study examines the use of riprap, submerged vanes, and a combination of these for scour reduction around vertical walls and spill-through abutments under clear-water conditions. Specifically, the influence of placing riprap stones with different apron shapes (geometry) and/or a group of submerged vanes of constant height and length on abutment scour was examined. The main aim is to propose the optimum apron geometry and placement of submerged vanes to (1) reduce edge failure at vertical walls and spill-through abutments; and (2) prevent shear failure at the spill-through abutment (no shear failure is observed around the vertical wall abutment). The results show that using ripraps for scour protection is more effective than submerged vanes. However, the highest reduction in scour depth was achieved when a combination of riprap and submerged vanes was used together. This arrangement can reduce the maximum clear-water scour depth by up to 54% and 39% with vertical walls and spill-through abutments, respectively. Furthermore, selecting appropriate apron scale ratios reduces the required riprap volume by up to 46% and 31% for the vertical wall and spill-through abutment, respectively. In addition, the installation of vanes increased the riprap stability and reduced edge failure in both abutments tested. Finally, using riprap aprons with proper scales ratios at the downstream side of the spill-through abutment also prevents shear failure in this zone.

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Effects of increasing the width of collar on reduction of scouring surrounding the rectangular piers in a 180-degree bend

2023

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Employment of protective structures is vital for reducing the effect of the local scour created surrounding the bridge piers. One of the most effective protective structures used for controlling and reducing scour surrounding the bridge piers is the collars. Hence, research on the mechanism of scouring surrounding the combination of pier and collar as well as the effect of collar on reduction of scouring surrounding the pier is of great significance. In this study, the effect of various collar width-to-pier width ratios on reduction of scouring parameters surrounding the rectangular piers has been investigated experimentally in various 180-degree sharp bend positions. The experiments were conducted under clear water and threshold of sediment motion in the upstream straight path. Results indicated that collars with collar width-to-pier width ratios equal to 3 to 4 perform the best at reducing the maximum depth of scouring in front of the nose of piers. Increasing the width of collar surrounding the piers reduces the maximum depth of scouring. Increasing the length of pier reduces the efficiency and effectiveness of the collar in delaying the scour process at the pier nose as well as the amount of the maximum scour reduction. The highest amount of scour depth reduction occurred in the vicinity of the pier and the collar at the 90-degree section with the collar installed with a ratio of collar width to pier width equal to 4 surrounding the piers with a ratio of length to width equal to 2 and 3 by approximately 75 and 70%, respectively.

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Combination of Scour Protection Devices Around Oblong Bridge Pier

Cited by 7 publications

References 3 publications

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Combination of Riprap and Submerged Vane as an Abutment Scour Countermeasure

Effects of increasing the width of collar on reduction of scouring surrounding the rectangular piers in a 180-degree bend

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