What do you know about shallow piers, Civil Engineering

Assignment Help:

Q. What do you know about Shallow Piers?

In case of some of the existing bridges, piers may be shallow and grip may be found to be inadequate. Protection round piers is then required to be given for their safety. Minimum grip essential for safety is worked out as 1/4 the total height of existing pier from bottom to design H.F.L. At this level bed scour is required to be arrested by providing stone apron with adequate quantity to fully cover scoured face. Launching slope in sandy bedded rivers is assumed as 2 horizontal to 1 vertical. Size and thickness are assumed same as in case of apron of the guide bunds. If one man stone is found to be of insufficient weight to be stable, concrete blocks or stone crates are required to be used. Placing stone round piers at unnecessary higher level is inadvisable as it is liable to be displaced and washed down more easily. At the same time it is not a safe and feasible proposition to wait till river bed scours to just the safe level of 1/ 4 height to ensure minimum grip length. Dumping of stone has, therefore, to be resorted to a little earlier before the lowest safe level is reached.


Related Discussions:- What do you know about shallow piers

Compute the porosity of the initial soil sample, A completely saturated sam...

A completely saturated sample of clay has a volume of 31.25 cm 3 and a weight of 0.5866 N. The same sample after drying has a volume of 23.92 cm 3 and a weight of 0.4281 N. Compu

Epoxy-coated bars vs galvanized bars, Bonding performance to concrete: Epox...

Bonding performance to concrete: Epoxy-coated bars vs. galvanized bars  Based on the findings of CEB Bulletin 211 the bonding of galvanized bars to concrete is lower in early

Explain detention or retention ponds - hydrology, Explain Detention or Rete...

Explain Detention or Retention Ponds Detention/Retention Ponds: Designed to reduce and contain the peak runoff from developed areas (more impervious). Attempt to limit the runo

Explain the clearance interval - signalized intersections, Explain the Clea...

Explain the Clearance Interval - Signalized Intersections  Also known as "Red Clearance Interval" and "All Red"        r = (w+L) / V - If there is no pedestrian traffic r

Amount of water that added to achieve the optimum moisture, Geotechnical pr...

Geotechnical project specifications require that the soil's optimum moisture content of 24% be maintained during the roadbed's construction.   The field moisture test finds that fi

Concrete surround for drainage pipes, Concrete surround is generally adopte...

Concrete surround is generally adopted for rigid drainage pipes to resist high traffic loads (for instance under shallow covers) and to allow for using pipes with lower strength. F

Pre-stressing work, Under which situation shall engineers use jacking in ag...

Under which situation shall engineers use jacking in agreement end only and from both ends in pre-stressing work?

Pressure distribution under rigid and flexible footings, Pressure distribut...

Pressure distribution under rigid and flexible footings For rigid and thick footings, pressure distribution under the footings is generally presumed to be linear. If symmetric

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd