Item 400 Piling

80 questions • 2 mo ago

Question list

Piling removal: Piling not part of the structure should be removed or cut off at least _____ below the footing or finished ground elevation

300mm

Test load: The load should be applied in increments of ______ tonnes as directed by the Engineer

5 or 10

Load intervals: Each load increment should be held for an interval of ______

2.5 minutes

Settlement readings: Gross settlement readings, loads, and other data should be recorded immediately after pumping has ceased and again after an interval of 2.5 minutes for a total period of ______

5 minutes

Bearing power: When bearing power is determined by a formula, timber piles should be driven until a computed safe bearing power of each is not less than ___ tonnes

Formula selection: Modified Hiley's Formula or any formula from equipment brochures should be used when the ratio of ram or hammer weight to pile weight is greater than ____

1/4

Hiley's Formula should be used when this ratio is less than ___

1/4

Minimum penetration: Required minimum penetration of all piles should be _____

Exposed piles: For exposed piles, the embedded length should be equal to or greater than the exposed length but not less than ____

Bearing Power: In all cases, the bearing power of concrete and steel piles shall be determined by formula. The piles must be driven until the safe bearing power of each is computed to be not less than ______

27 tonnes

Pile Straightness: In round piles, a line drawn from the center of the tip to the center of the butt should not fall outside the cross-section of the pile at any point by more than ___ of the pile's length

Short Bends: In short bends, the distance from the center of the pile to a line stretched from the center of the pile above the bend to the center of the pile below the bend shall not exceed ___ of the length of the bend or a maximum of _____

4%, 65mm

Peeling: All piles shall be peeled, removing all rough bark and at least ___ of the inner bark

80%

Clean Wood: Not less than ___ of the surface on any circumference shall be clean wood

80%

Bark Strips: No strip of inner bark remaining on the pile shall be more than ____ wide and ____ long

20mm, 200mm

Preservative Penetration: The minimum penetration of the preservative into the surface of the timber shall be ____

20mm

When the pile is not exactly round, the average of ___ measurements maybe used.

Treatment Penetration: The penetration of treatment shall be determined by well-distributed holes, all such holes shall be plugged with plugs approximately ____ larger in diameter than the bit used in boring the holes

2mm

Class: Concrete shall be ______ unless otherwise specified in the Plans

Class C

Proportioning: Concrete shall be proportioned to achieve a range of ______ slump, self-compacting mix, or as directed by the Engineer

6" to 8"

Shell Diameter: Unless otherwise called for on the Plans or Special Provisions, shells for cast-in-place concrete piles shall have a minimum diameter at cut off of _____

305mm

Unless otherwise called for on the Plans or Special Provisions, shells for cast-in-place concrete piles shall have a minimum of ______ diameter at tip

203mm

Shells for cast-in-place concrete piles shall be made from not less than ____ in thickness plate stock conforming to AASHTO M 183

4.55mm

Steel H-Piles shall not contain less than one-fifth percent nor more than _____ of copper, except that steel manufactured by the acid-bessemer process shall not be used

35%

All piles shall be driven within an allowed variation of _______ of pile length from the vertical or batter as shown on the Plans

20mm/m

The maximum allowable variation at the butt end of the pile shall be _____ in any direction from the location shown on the Plans or as directed by the Engineer

75mm

Each pile shall, after driving, be within _____ from the theoretical location underneath the pile cap or underneath the superstructure in case of pile bents

150mm

Piles shall be used only in places where the minimum penetration of ____ in firm materials can be obtained

Piles shall be used only in places where the minimum penetration of ____ in soft materials can be obtained

Gravity hammers shall not weigh less than ____ of the combined weight of the pile and driving head but not less than ______

60%, 2000kg

The fall shall be regulated so as to avoid injury to the pile and shall in no case exceed _____ for timber and steel piles

4.5m

The fall shall be regulated so as to avoid injury to the pile and shall in no case exceed ____ for concrete piles unless otherwise specified or approved by the Engineer

2.5m

The plant shall have sufficient capacity to deliver at all times a pressure equivalent to at least _______ at two ____ nozzles

690kPa, 19mm

Piles shall be strapped with three metal straps: one about ______ from the butt, one about _____ from the butt, and the third, about _____ from the tip

450mm, 600mm, 300mm

Additional straps shall be provided at about ____ centers between tip and butt

4.5m

Straps shall be ____ wide, ____ thick, cold rolled, fully heat treated, high tensile strapping, painted and waxed

38mm, 0.8mm

A ____ chamfer strip shall be used in all corners

25mm

Form shall be water-tight. Casing, if used in drilling operations, may be left in place and shall not be removed until at least ___ hours after

Piles shall not be moved until the tests indicate that the concrete has attained a compressive strength of at least ____ of the design 28-day compressive strength

80%

If testing equipment is not available, as in isolated areas, piles shall not be moved until after _____ after casting

14 days

If testing equipment is not available, as in isolated areas, piles shall not be transported or driven prior to _____ after casting

28 days

If high early strength cement is used, piles shall not be moved, transported or driven prior to ______ after casting

7 days

All holes will be examined for straightness and any hole which on visual inspection from the top shows less than ____ the diameter of the hole at the bottom of the hole will be rejected

1/2

Prior to the initial concrete set, the top ____ of the concrete-filled pile or the depth of any reinforcing cage, whichever is greater, shall be consolidated by acceptable vibratory equipment

The bottom of the casing shall be maintained not more than _____ nor less than _____ below the top of the concrete during withdrawal and placing operations unless otherwise permitted by the Engineer

1.5m, 0.3m

The pipe wall thickness shall not be less than that shown on the Plans but in no case less than ____

5mm

Closure plates and connecting welds shall not project more than ______ beyond the perimeter of the pile tips

12.5mm

No shell, pipe, or piles shall be filled with concrete until all adjacent shells, pipes, or piles within a _________________ the average pile diameter, whichever is greater, have been driven to the required resistance

1.5m or 4.5 times

After a shell or pipe has been filled with concrete, no shell, pipe or pile shall be driven within 6 m thereof until at least ____ days have elapsed

Drilled shafts are normally sized in _____ diameter increments

15.24cm

Drilled shafts normally have a minimum diameter of _______

45.72cm

The diameter of a shaft socketed into rock should be a minimum of _______ larger than the socket diameter

15.24cm

If a shaft must be inspected by the entry of a person, the shaft diameter shall not be less than _______

76.20cm

The center-to-center spacing between shafts is normally restricted to a minimum of ____ to minimize the effects of interaction between adjacent shafts during construction or in service

3x base

Increase density values by _________ in salt water

0.314 KN/m³

If desanding is required, sand content shall not exceed _____ (by volume) at any point in the shaft excavation as determined by the American Petroleum Institute sand content test

Prior to placing shaft concrete, slurry samples shall be taken from the bottom and at intervals not exceeding _____ for the full height of slurry

3.05m

The outside diameter of casing shall not be less than the specified size of the shaft. It shall conform to AASHTO M 270 ______ (ASTM A 709) unless otherwise specified

Grade 36

Concrete spacers or other approved noncorrosive spacing devices shall be used at sufficient intervals not exceeding _____

1.5m

When the size of the longitudinal reinforcing steel exceeds 25 mm, such spacing shall not exceed ____

For piles less than 2.5 meters in diameter, the elapsed time from the beginning of concrete placement in the shaft to the completion of placement shall not exceed ____

2 hours

For piles 2.50 meters and greater in diameter, the concrete placing rate shall not be less than ____ of pile height per each 2-hour

The concrete mix shall be of such design that the concrete remains in a workable plastic state throughout the _____ placement limit

2 hour

The upper _____ of concrete shall be vibrated or rodded to a depth of 1.5 meters below the ground surface except where soft unmixed soil or slurry remaining in the excavation will possibly mix with the concrete

1.5m

For at least ____ after pile concrete has been placed, no construction operations that would cause soil movement adjacent to the shaft, other than mild vibration, shall be conducted

48 hours

The drilled shaft shall be within _____ of the plan position in the horizontal plane at the plan elevation for the top of the shaft

15.24cm

The vertical alignment of the shaft excavation shall not vary from the plan alignment by more than _______ of depth

20.83mm/m

After all the shaft concrete is placed, the top of the reinforcing steel cage shall be no more than ______ above and no more than ______ below plan position

15.24cm, 7.62cm

When casing is not used, the minimum diameter of the drilled shaft shall be the diameter shown on the plans for diameters _______ or less

60.96cm

The diameter shown on the plans for diameters greater than 60.96 cm, is not more than ______

2.54cm

The top elevation of the shaft shall be within ______ of the plan top of shaft elevation

2.54cm

The bottom of the shaft excavation shall be normal to the axis of the shaft within ______ of shaft diameter

62.5mm/m

By cutting away the concrete at the end of the pile, leaving the reinforcing steel exposed for a length of _____ for corrugated or deformed bars

40D

Cutting away the concrete at the end of the pile, leaving the reinforcing steel exposed for a length of ______ for plain bars

60D

The forms shall remain in place not less than _____

7 days

The longitudinal reinforcement of the piles shall be embedded in the structure above to a length equal to at least _____ of the main reinforcing corrugated bars and _____ for plain bars)

40D, 60D

The distance from the side of any pile to the nearest edge of the cap shall not be less than _____

200mm

The sawed surface shall be thoroughly brush-coated with ___ applications of hot creosote oil or other approved preservative

The Contractor shall keep records of all piles driven or installed, the copy of the record shall be given to the Engineer within _____ after each pile is driven

2 days

The quantity to be paid for will be the sum of the lengths in ______ of the piles of the several types and lengths ordered in writing by the Engineer

meters

YT1 Materials Engineer EXAM

Anonymous · 100 questions · 2 mo ago

YT1 Materials Engineer EXAM