# Homework Day 1

Urban and Civil

Nov 26, 2013 (4 years and 5 months ago)

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HW1
-
1

Homework Day 1

1.

The scour elevation can normally be found on the
bridge hydraulics sheet and in the Pile Data Table.

True

___

False _____

2.

The Required Driving Resistance will normally be
shown in the Pile Data Table. Where is the Pile Data
Table found?

A. The Contractor’s Pile Installation Plan

B. The Special Provisions

C. The Standard Specifications

D. The Plans

E. None of the Above

HW1
-
2

Homework Day 1

3.

On what type of hammer would you expect to see a
bounce chamber pressure gauge and what is it used for?

A.

Air hammer to verify stroke height

B.

Double acting Diesel to verify energy

C.

Single acting Diesel to verify stroke height

D.

Vibratory hammer to estimate the amount.

E.

None of the above

HW1
-
3

Homework Day 1

4.

True or False: Prestressed concrete piles are
considered non
-
displacement piles.

True

___

False _____

5
. True or False: A “Pier” refers to a pile foundation for
which the piles are cutoff below grade, a pile cap and a
column constructed up to the required beam elevation.

True

___

False _____

HW1
-
4

Homework Day 1

6
.

What

are

the

three

types

of

7
.

When

using

which

of

the

above

is

a

template

not

required?

8
.

What

are

the

three

basic

pile

hammer

types?

Fixed, Semi
-
fixed, Swinging

Fixed

Diesel, Air/Steam & Hydraulic

HW1
-
5

Homework Day 1

PROBLEM 9 (PLUMB PILE)

Furnished Pile Length =

Reference Elevation =

Cut
-
off Elevation =

Ground Elevation =

Scour Elevation =

Pile Length Below

Ref. Elev. =

TIP ELEVATION
:

Tip Elev. = +4.0

43.0 ft.

=
-
39.0 ft.

PENETRATION
:

Penetration =
-
20.00

(
-
39.0)

= 19.0 ft.

LENGTH DRIVEN
:

Length Driven =
-
0.50

(
-
39.0)

= 38.50 ft.

Ref. Elev.
-

Length Below Ref. Elev.

Lowest of 3 Elev.
-

Tip Elev.

Cut
-
off Elev.
-

Tip Elev.

55 ft.

+ 4.0 ft.

-
0.50 ft.

-

15.00 ft.

-

20.00 ft.

43.0 ft.

HW1
-
6

Homework Day 1

Batter =

Corr.

Factor =

Furnished Pile Length =

Reference Elevation =

Cut
-
off Elevation =

PROBLEM 10: BATTERED PILE (5:2)

Ground Elev. (Excav.) =

Scour Elev. =

Pile Length Below

Ref. Elev. =

TIP ELEVATION
:

Tip Elev. =+8.76
-

[57 x 0.928]

=+8.76

52.9

=
-
44.14

PENETRATION
:

Penetration = [
-
9.92

(
-
44.14)]

0.928

= 34.22

0.928

=
36.88 ft.

LENGTH DRIVEN
:

Length Driven = [+4.00

(
-
44.14)]

0.928

= 48.14

0.928

=
51.88 ft.

Ref. Elev.
-

[
Length Below Ref. Elev. X Corr. Factor
]

[
Lowest of 3 Elev.
-

Tip Elev.
]

Corr. Factor

[
Cut
-
off Elev.
-

Tip Elev.
]

Corr. Factor

5:2

0.928

60 ft.

+8.76 ft.

+4.00 ft.

-
5.72 ft.

-
9.92 ft.

57 ft.

HW1
-
7

Homework Day 1

11
.

.
The

delivered

length

of

each

of

the

piles

at

End

Bent

1

originally

was

100

feet

and

Pile

4

was

a

driven

splice
.

*Assume first set
-
check performed within 15 min. of end of initial drive

** Splice in a new pile section

# of Set
-

Checks*

# of

Redrives

Length of

Cut
-
off

(ft.)

Length of

Splice**

(ft.)

1

0

5.88

-

0

0

10.73

-

2

1

3.23

-

2

1

-

20

Bent 1

Pile #

Length of

Pile Below

Cut
-
off

1

94.12

2

89.27

3

96.77

4

119.98

Predrill

Length

20’

20’

20’

20’

Set
-

Checks*

# of

Redrives

Cut
-
off

(ft.)

Length of

Splice**

(ft.)

Bent 1

Pile #

Length of

Pile

provided

1

2

3

4

Predrill

Length

Splice

Labor

Driven

Splice

PAID

100

0

0

0

0

0

0

5

100

100

0

0

0

0

0

0

5

100

100

0

10

20

0

0

0

5

130

100

0

10

20

20

30

10

-

190

HW1
-
8

Homework Day 1

12
.

.
The

delivered

length

of

each

of

the

piles

was

80

feet
.

Pile

3

was

a

driven

splice
.

*Assume first set
-
check performed within 15 min. of end of initial drive

** Splice in a new pile section

# of Set
-

Checks*

# of

Redrives

Length of

Cut
-
off

(ft.)

Length of

Splice**

(ft.)

Int.Bent 5

Pile #

Length of

Pile Below

Cut
-
off

1

2

3

4

Preform

Length

25’

25’

25’

25’

0

2

2

1

0

1

1

0

10.73

3.23

5.88

-

-

-

-

20

69.27

76.77

99.98

74.12

Set
-

Checks*

Redrives

Cut
-
off

(ft.)

Length of

Splice**

(ft.)

Int.Bent 5

Pile #

Length of

Pile

provided

1

2

3

4

Preform

Splice

Labor

Driven

Splice

PAID

80

7.5

0

0

5

0

0

0

87.5

80

7.5

10

0

5

20

0

0

117.5

80

7.5

10

20

-

20

30

10

177.5

80

7.5

0

0

5

0

0

0

87.5