Question

In: Civil Engineering

Piles are driven with hammers that are mounted on cranes. There are several commonly used hammer...

Piles are driven with hammers that are mounted on cranes. There are several commonly used hammer types to install piles. List at least two hammer types with brief explanation about its function and usage (DO NOT copy and paste contents from lecture slides. Use your own words.)

please type answer don't scan

Solutions

Expert Solution

1) single acting hammer

2) double acting hammer

SINGLE ACTING HAMMER

The single acting hammer is raised by steam or compressed air and is dropped on the pile head.

It is very heavy .

They operate at a moderate speed of about 60 to 75 blows per minute.

These hammers have improper valve timing .

It has high mechanical friction.

The blows delivered are rapid compared to a drop hammer .

These hammers provide consistent energies when the stroke is controlled.

DOUBLE ACTING HAMMER

Steam or air pressure is used to lift the ram and accelerate it down.

The blows are rapid ( 90 to 240 blows per min )

The energy delivered in each blow varies greatly with steam or air pressure.

If the number of blows per minute is equal to the rated value , then the pressure is correct.

It has high efficiency due to steam operation.

The pile is in constant motion as the blows are in quick succession , so it reduces the damage to pile head.


Related Solutions

Piles can be fabricated from several different materials. Compare timber piles to concrete piles, listing the...
Piles can be fabricated from several different materials. Compare timber piles to concrete piles, listing the advantages of each material.
Calculate the Value-Added Ratio for the following production of Hammer Pants Hammers: Raw materials pulled from...
Calculate the Value-Added Ratio for the following production of Hammer Pants Hammers: Raw materials pulled from stock 3.82 hours Materials sent to proper department 4.60 hours Formation of raw metal into Hammer 2.78 hours Moving to assembly - Metal piece 3.43 hours Hard plastic formation of custom parachute pants 2.67 hours Painting and finishing of plastic parts 3.41 hours Moving to assembly - plastic parts 2.32 hours Holding bin waiting for assembly 5.62 hours Assembly - attaching parts together 2.87...
A group of concrete piles (3×3) is driven into a uniform layer of medium dense sand,...
A group of concrete piles (3×3) is driven into a uniform layer of medium dense sand, which has a unit weight of gt = A kN/m3and a friction angle of f = Bo. The water table is C m below the ground level. Each pile has a diameter of 400mm, a length of 10m. The centre-to-centre spacing of the piles is s = D m. Assume proper values for A, B, C and D. Calculate the ultimate vertical capacity of...
Alice and Bob are have several piles of chips. On each turn they can either remove...
Alice and Bob are have several piles of chips. On each turn they can either remove 1 or 2 chips from one pile, or split a pile into two nonempty piles. Players take turns and a player that cannot make a move loses. Find the value of the Sprague–Grundy function for positions with one pile made of n chips. (Please do not forget to prove correctness of your asnwer.)
Exaplain why a water hammer is bad and what is it used for?
Exaplain why a water hammer is bad and what is it used for?
staybolts are most commonly used in ------ boilers.
staybolts are most commonly used in ------ boilers.
An impedance tube, mounted in a room at 20oC, is used to evaluate experimentally the sound...
An impedance tube, mounted in a room at 20oC, is used to evaluate experimentally the sound absorbing properties of some acoustic material. The maximum and minimum sound pressure levels at 500 Hz measured in the tube are 92 dB and 78 dB respectively. The first pressure minimum is found to occur at a distance of 0.1m from the face of the sound absorbing material. Calculate 1) The ratio of the maximum to minimum pressure amplitude, SWR 2) The reflection coefficient,...
Suppose Blue Thumb Tools is considering the introduction of a new, heavier hammer to be used...
Suppose Blue Thumb Tools is considering the introduction of a new, heavier hammer to be used for driving spikes. The new hammer will cost $490,000. The cost will be depreciated straight-line to zero over the project’s five-year life, at the end of which the new hammer can be scrapped for $40,000. The new hammer will save the firm $146,000 per year in pretax operating costs, and it required an initial investment in net working capital of $35,000. The tax rate...
Suppose Blue Thumb Tools is considering the introduction of a new, heavier hammer to be used...
Suppose Blue Thumb Tools is considering the introduction of a new, heavier hammer to be used for driving spikes. The new hammer will cost $490,000. The cost will be depreciated straight-line to zero over the project’s five-year life, at the end of which the new hammer can be scrapped for $40,000. The new hammer will save the firm $146,000 per year in pretax operating costs, and it required an initial investment in net working capital of $35,000. The tax rate...
Why is iron such a commonly used metal in metalloenzymes?
Why is iron such a commonly used metal in metalloenzymes?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT