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Design of Hammer Type of Machine Foundation: Given Data

The document describes the design of a machine foundation for a hammer type machine. It provides data on the weights, dimensions, and properties of the machine components and soil. The solution involves dimensioning the foundation based on the minimum required base area and thickness. Checks are performed to ensure the foundation section is safe based on weight, that the amplitude of vibration is below the permissible limit, and that the stress in the soil is below its safe capacity. The foundation passed the weight and stress checks but failed the amplitude check, meaning revisions are required to reduce vibration.

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AkarshGowda
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207 views3 pages

Design of Hammer Type of Machine Foundation: Given Data

The document describes the design of a machine foundation for a hammer type machine. It provides data on the weights, dimensions, and properties of the machine components and soil. The solution involves dimensioning the foundation based on the minimum required base area and thickness. Checks are performed to ensure the foundation section is safe based on weight, that the amplitude of vibration is below the permissible limit, and that the stress in the soil is below its safe capacity. The foundation passed the weight and stress checks but failed the amplitude check, meaning revisions are required to reduce vibration.

Uploaded by

AkarshGowda
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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DESIGN OF HAMMER TYPE OF MACHINE FOUNDATION

GIVEN DATA
Weight of Tup, Wt 30 KN
incemental wt of anvil then wt of tup 20 times
Weight of Frame 400 KN
Length of Anvil, l 3 m
Breadth of Anvil, b 2 m
E for pad of timber 1300000 KN/m²
Thickness of timber pad 0.6 m
Velocity of fall of Tup 7 m/s
Coefficient of restitution 0.6
Coefficient of uniform compression of soil 38000 KN/m³
Permissible amplitude of foundation 0.0015 mm
Permissible amplitude of anvil 3 mm
Safe bearing capacity of timber 4640 KN/m²
Safe bearing capacity of soil 300 KN/m²

SOLUTION
(A) Dimensioning

Weight of Anvil, Wa 600 KN


Thickness of anvil 1 m
Area of anvil, Aa 6 m²
Depth of foundation below Anvil 1.5 m
min. base area required, Amin 22.4 m²
Weight acting on foundation 1688 KN
Thickness of pad under anvil (0.6-1.2) 0.6 m

Breadth of foundation, B 5
Length of foundation, L 7
Thickness provided for foundation 2.5 m
Area provided for foundation 35 m²

area of section SECTION IS SAFE

(B) Check for weight

Weight of foundation, Wf 1956 KN

SAFE

(C) Check for Amplitude


weight of timber pad 18.18 KN
Total vibrating mass 303.1784 ton
Stiffness of soil under foundation, Kz 3990000 KN/m
Natural frequency, ωnz 114.7195 rad/s
Velocity of anvil after impact, V 0.533333 m/s
Amplitude of foundation 0.004649 m

NOT SAFE

(C) Check for stress

Stress in soil 85.31429 KN/m²

SAFE
Area of foundation provided SECTION IS SAFE

Check for weigth of foundation SAFE

Check for amplitude NOT SAFE

Check for stress in soil SAFE

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