What is pile cut off elevation?

Pile cut-off level is the actual level at which the concrete piles are placed underneath the pier so they can retain the same level. The concrete is cut-off at a certain height below, to allow the steel bars to go up till the pier to assure the bond is strong between them.

How do you cut piles?

Cropping is carried out by drilling a hole into the side of the pile, at cut off level, and using a split tube and wedge (either hydraulically powered on larger piles or hand driven on smaller piles to split the concrete). The surplus concrete is removed by lifting with a crane or excavator as a single piece.

What is pile cropping?

Pile cropping also referred to as pile cutting or pile breaking is the process of removing or cropping concrete piles without damaging the embedded rebar. We are typically approached by clients wanting to crop concrete piles to a specified length without damaging the reinforced rebar embedded within the concrete.

What is the minimum distance between piles?

The end bearing piles that are used in compressible soils must be spaced at a minimum of 2.5d and a spacing of 3.5d(Maximum)for those piles placed on less compressible or stiff clay soil. The Indian Road Congress specifies a minimum spacing of 3d or a distance equal to pile perimeter for the friction piles.

What is a cutoff level?

Cut-offs for levees are typically shallower than those for dams, for obvious reasons associated with the height of the levee itself and the nature of the foundation materials: there is no call to penetrate one or two hundred feet of embankment material and then continue for another hundred feet into rock, often both …

What is pile founding level?

In piling works, normally founding levels of bored piles are defined by using total core recovery or rock quality designation RQD. For instance, if standard core barrels are used to collect samples, it may indicate sufficient core recovery for samples full of rock joints and weathered rock.

How do you break concrete piles?

The most basic method of breaking down piles is to utilise either hand held (Light) breakers or plant mounted pneumatic (Heavy) breakers. This method may be the easiest to specify and takes little initial planning.

What is pile toe level?

Pile toe – A pile’s lowermost end. Redrive – A substantial number of impacts, or a substantial time of vibration, which significantly deepens the pile’s toe elevation.

Is Code pile breaking?

Following are the Indian Standard Codes on Pile Foundations: IS 2911 : Part 1 : Sec 1 : 1979 Driven cast in-situ concrete piles. IS 2911 : Part 1 : Sec 2 : 1979 Bored cast-in-situ piles. IS 5121 : 1969 Safety code for piling and other deep foundations.

On what basis is the allowable load on a pile determined?

Explanation: The allowable load Qa is the safe load which the pile can carry safely and is determined on the basis of: i) overall stability of the pile-foundation ii) the permissible settlement iii) ultimate bearing resistance divided by factor of safety. 3.

How many piles do I need calculator?

Allowable load and spacing. Both the dynamic and static formulas indicate that an allowable load of 15 tons per pile is reason- able. The number of piles required to support the load is 180/15 = 12 piles.

What are drug screen cutoff levels?

In the case of urine analysis, drug testing cutoff levels are measured in nanograms per milliliter (ng/ml). For example, an initial screening for marijuana must show at least 50 ng/ml, and then confirmatory tests must prove at least 15 ng/ml.

Is the top of a piling a cut off elevation?

The cut off elevation (top of pile) will be called out in the plans and is a surveyed elevation. Do not use the top of a piling as a reference elevation for other structural elements in the bridge. Set elevations from a true vertical control element, i.e. a benchmark.

Where is the cut off in a pile?

Pile cut-off level is located over or under the group. When it is over the ground, Concrete will run over from the pile head on execution. Because of tremie method, the upper section of pile comprises of weak concrete and some impure boring debris.

What’s the cut off level for a pile foundation?

Pile Cut-off level is the actual level at which the piles below pier are made to be of the same level. The concrete of pile is cut-off at the specified level (given in the specifications or drawings usually around 75 mm) while the steel is kept projected in-to the pile cap to make an effective bond between pile cap and piles.

What’s the cut off level on a pier?

Pile Cut-off level belongs to the actual level at which the piles underneath the pier are constructed so as to retain the same level.