TÍNH TOÁN CẦU VAM CONG

CALCULATION SHEET OF CASING FOR CONSTRUCTING BORED PILE OF PYLON PY1 & PY2- Using guide frame H300 connect with barge 3800T by bolt for casing installation work - Plan view of pile cap o

CUU LONG CORPORATION FOR INVESTMENT, DEVELOPMENT

AND PROJECT MANAGEMENT OF INFRASTRUCTURE

(CUU LONG CIPM)

vam cong bridge construction project Under central mekong delta region connectivity project

PACKAGE CW3A

CALCULATION SHEET FOR BORED PILE WORK – PYLON PY1, PY2

APRIL – 2014

JOINT VENTURE OF GS E&C – HANSHIN E&C

GS e&c - Hanshin e&C jv

-o0o -

Under central mekong delta region connectivity project

Project component 3A:

vam cong bridge construction project

CALCULATION SHEET

FOR BORED PILE WORK – PYLON PY1,PY2

CALCULATION SHEET OF CASING FOR CONSTRUCTING BORED PILE OF PYLON PY1 & PY2

- Using guide frame H300 connect with barge 3800T by bolt for casing installation work

- Plan view of pile cap of pylon PY1 & PY2

- Specification for bridge design 22TCN 272-05

- Specification for bridge design 22TCN 18-79

- Specification of bridge construction 22TCN 200-1989

- Shop drawing of bored pile of Vam Cong bridge

IV LOAD & LOAD FACTOR

1 Loads:

- Applied load on structures

VAM CONG BRIDGE

10900 63200

2 Load factor

-Load factor

3 Checking items

- Calculated items:

+ Calculate minimum length of casing

+ Cheking steel casing D2600, t=20mm in processing of bored pile work

4 Geological data:

+ Hole B-32, B-33 at pylon PY1:

N30-12.35

-21.45-21.45-33.25

+ Hole B-34, B-35at pylon PY2:

N30-16.54

-36.04

4 Typical elevation:

Description01

Silty sand, greyish brown-greyish yellow, loose to medium dense

Description10.88

+2.50

2

I CALCULATE MINIMUM LENGTH OF CASING

1 Formula:

- Length of casing is determined base on the balance of active pressure of soil & pressure of bentonine at tip of casing

- Supposed that, the tip of casing is embed in soil layer 3, the formula as follows:

+ Pressure of Bentonite liquid at tip of casing:

Where:

+ Active pressure of soil layers impact on casing are calculated as following formula:

(For more safety, ignore cohessive force C of soil)

Pa =na.(Pw + Pa2)

Where:

)

)

- Base on above formulas, length of casing embed in soil shall be calculated as following formula:

2 Calculate length of casing for Pylon PY1:

2.2 Calculate length of casing:

The geological data of soil as follows:

j : Internal friction angle of soil (Degree)

+ Buoyant density of soil layer 1:

+ Length of casing embed in soil layer 2:

3 Calculate length of casing for Pylon PY2:

3.1 Calculated diagram:

02 dn2

γ -1

1+e

2 0 i a3

3.2 Calculate length of casing:

The geological data of soil as follows:

j : Internal friction angle of soil (Degree) (Follow appendix 3-22TCN200-1989)

+ Buoyant density of soil layer 2:

II CHECKING STEEL CASING D2600 FOLLOWING THE STRENGTH CONDITION:

- Base on construction method of bored pile, steel casing D2600 shall be checked in the most dangerous stagePouring concrete

- Calculate for casing of Pylon PY2- the most dangerous

1 Parameter of steel casing D2600

1.1 Calculation diagram

Checking with the most dangerous stage of casing: When concreting The casing shall be calculated as

a beam(01 end is restraint point, 01 end is free) under compression & bending combination

The restrain point is tip of casing

Applied load on casing include: Stream pressure (lateral direction), load of steel cage, load of tremie pipe, load offlatform & other equipment

03 dn3

1.2 Loads:

a Load of stream pressure

- Load of stream pressure shall be calculated by bellow formula:

Where:

- The longitudinal drag force Pd.ch shall be taken as the product of longitudinal stream pressure and the projected surface exposed thereto Force point is center of surfavce exposed thereto of casing

Where:

b Vertical load on casing

+ Load of streel cage, flatform & other equipments : PLT=ηDC.LT= 159.5 T

+ Selfweight of casing: Pvách=hDC.Qvách= 47.81 T

+ Load of Tremie pipe:

1.3 Checking

- Casing is under compressive & bending combination

- Internal force at checking section:

- Calculate factored compression resistance

+ Detemine factor l :

+ Factored compression resistance

- Calculate factored compression resistance

Where:

P0,2

P 

u r

P0,2

II CHECKING BEARING CAPACITY OF CASING D2600 - BORED HOLE AB14

We calculate the capacity of casing D2600 follow specification for bridge design 22TCN272-05

Ignore tip bearing capacity of casing

The casing is completely embed in soil layer "3" - clay, qs = a*Su

- Plan view of pile cap of pylon PY1 & PY2

- Specification for bridge design 22TCN 272-05

- Specification for bridge design 22TCN 18-79

- Specification of bridge construction 22TCN 200-1989

- Shop drawing of bored pile of Vam Cong bridge

IV LOAD & LOAD FACTOR

1 Loads:

- Applied load on structures

2 Load factor

-Load factor

VAM CONG BRIDGE

RemarkPoint 2.23, Table 13/22TCN200-1989Point 2.23, Table 13/22TCN200-1989

10900 63200

3 Checking items.

- Calculated items:

+ Checking cable, hanger system when lifting the rebar cage

+ Checking construction rebar cage

+ Calculate minimum length of welding line for 04 rebars of rebars cage (welding connection on all length of rebar cage)

+ Checking stable of barge in the most dangerous case

A CHECKING CABLE, HANGER SYSTEM WHEN LIFTING THE REBAR CAGE

I Case 1: Lifting 01 rebar cage

1 Diagram of lifting 01 rebar cage

PART II: CALCULATION

U-bolt M16

main steel

2xd40

Steel plate,t =20mm Ear of crane hook, t = 20mm

Steel plate, t =20mm

Ear of crane hook,t=20mm

STEEL PIPE D300 FOR HOISTING REBAR CAGE

DETAIL C

Cáp c?u D32 L=15m

Cáp c?u D25

Chi ti?t C Cable cranes L=2,5 m

Cable cranes L= 15 m Cáp c?u D32 L=12m

2 Loads

3 Checking beam for lifting steel cage (steel pipe D300, thickness t=30mm)

a Diagram:

b Checking:

+ Moment diagram (calculate by Midas civil 7.0.1) - T.m

+ Reaction diagram (calculate by Midas civil 7.0.1) - T

+ Checking:

(T/m)

Wx (cm3)

s (kG/cm2)

4 Checking cable D25 type 1, ear for crane hook type 1

- Ear for lifting hook type 1:

Steel plate, t =20mm

Ear of crane hook,t=20mm

STEEL PIPE D300 FOR HOISTING REBAR CAGE

5 Checking cable D32 type 2, ear for crane hook type 2

- Cable type 2:

- Ear for lifting hook type 2:

1 Load:

- Ear for lifting hook:

- U-bolts:

+ Shearing resistance of 01 U-Bolt:

6

Where: Ab:area of the bolt corresponding to the nominal diameter (mm2)

Fub: specified minimum tensile strength of the bolt specified in Article 6.4.3 (MPa)Ns: number of shear planes per bolt

B CHECKING CONSTRUCTION REBAR CAGE

I Arrangement of construction rebar cage:

We use 04 PC bars D36 to make construction rebar cage

C CACLUTE MINIMUM LENGTH OF WELDING LINE FOR 04 REBARS OF REBAR CAGE (WELDINGCONNECTION ON ALL LENGTH OF REBAR CAGE)

I PURPOSES:

To ensure the rebar cage shall not fallen in the bored hole in construction processing, we propose to change U-boltconnection of main rebar at 04 opposite possition on cross section of rebar cage to welding connection

II LOADS:

We have 04 rebar cage segments for 01 bored pile Load of each segment as following:

III CALCULATE LENGTH OF WELDING LINE:

1 Height of welding line:

Minimum size of fillet welds is followed table 6.13.3.4-1 - 22TCN272-05

Welding connection for rebar D32, D36, D40, we choose the height of welding line is 8mm

2 Calculate the factored resistance of weld connection:

Fillet-welded connections subjected to shear on the effective area shall be taken as the lesser of either

the factored resistance of the connected material or the factored resistance of the weld metal:

+ Factored resistance of connected material:

Point 6.13.5.3-1 - 22TCN272-05

jv:Resistance factor for shear as specified in Article 6.5.4.2

Minimum size of fillet weld (mm)6

Base metal thickness of thinner part jointed T

+ Segment 4:

+ Segment 3:

04 position welding steel bars

connecting segm ents rebar cage

+ Factored resistance of the weld metal:

Fexx: Classification strength of the weld metal (MPa)

3 Calculate length of weld line:

248.029 mm

=> Choose length of weld line at connection between segment 04 & segment 03 of 04 location of

rebar cage cross section is L = 25cm

0

537.395 mm

=> Choose length of weld line at connection between segment 04 & segment 03 of 04 location of

rebar cage cross section is L = 55cm

909.438 mm

=> Choose length of weld line at connection between segment 04 & segment 03 of 04 location of

rebar cage cross section is L = 920mm, devide to 02 segment with length 460mm and distance between

4

71.5 10 1330.492

4

121 10 1330.492

D CHECKING STABLE OF BARGE IN THE MOST DANGEROUS CASE

I Diagram:

The most dangerous case of barge is when crane stand on the barge & lifting the rebar cage

The crane always stand in the middle of barge In the processing of lifting rebar cage, load of rebar cage shallcause the overturn moment for barge

Hard anchor barges by stell pipe D900 Hard anchor barges by stell pipe D900

? ng vách t?m D2600

10

III Checking bearing capacity of pipe pile D900 to anchor the barge

1 Geological datas: (PY2)

SPT index N30-16.54

-36.04

2 Calculate the bearing capacity of pipe pile D900

Calculate bearing capacity of pile follow specification TCXDVN 205-1998:

Formula:

With: Qtc = m(mr.qp.Ap + u.mf.fsi.li)

Qa: Bearing capacity of pipe pile

Ktc: safety factor, which is equal = 1.75

Qtc: Standard bearing capacity of pipe pile

m = 1: working condition factor of soil pile

mr = 1: working condition factor at tip of pipe pile

mf = 1: working condition factor at the pipe pile side

u = perimeter of pipe pile cross section u = 2.827 m

qp = 157.5 T/m2: resistance of soil at pipe pile tip, 13.96m depth, silty sand

(refering to table A1 - appendix A - TCXD 205-1998)

fsi (T/m2): side friction of pile (refering to table A2 - appendix A - TCXD 205-1998)

stiff to stiff

Factored load P (T)154

3 Checking lifting capacity of pipe pile:

Calculate bearing capacity of pile follow specification TCXDVN 205-1998:

Formula:

With: Qtc = m.u.mf.fsi.l + W

Qa: Bearing capacity of pipe pile

Ktc: safety factor, which is equal = 1.75

Qtc: Standard bearing capacity of pipe pile

m = 1: working condition factor of soil pile

mf = 1: working condition factor at the pipe pile side

u = perimeter of pipe pile cross section u = 2.827 m

qp = 157.5 T/m2: resistance of soil at pipe pile tip, 13.96m depth, silty sand

(refering to table A1 - appendix A - TCXD 205-1998)

fsi (T/m2): side friction of pile (refering to table A2 - appendix A - TCXD 205-1998)

W: Weight of pipe pile W = 7.768 T

index Li

145.548

ConclusionOK

index Li

Qtc (T)

12