How we breaks a Malaysia Book of Records

On 6 June 2008, we will attempt to break the current Malaysia Book of Records for the Tallest Scout Pioneering Tower. The record is based using material such as bamboo or bakau to build a tall structure. Our record will list as Human Achievement in the Malaysia Book of Records.

This pioneering tower project will be build by 50 scouts in 9 days with the design advice provided by mechanical and structural engineers. They will apply the pioneering project technique with engineering concept. Those techniques are X-trestle, A-trestle, Four-pod as simple unit to joint up to be a strong base foundation, lashings to hold the woods and bamboos, bracing, strengthen the base foundation with more wooden platforms, pegs to reinforce the lashings by elastic rubber tyre tubes, symmetrical support system, cross support and others. No piling or drilling of holes on the land is required for tower foundation. The basic materials required are mangrove forest wood ( bakau wood as used for piling works ), bamboo, rope, hawser, gunny string and elastic tyre tube only. However, banners and flags will be put on for decoration purposes. Also, wire fixed for earthing purpose. The basic equipments are knifes, scissors, gloves, ropes, saw, parang, safety belt, safety helmets and measuring tape only. No modern technology equipment or devices will be used like forklift, crane, sky lift, scaffoldings, lifting devices, chain block, jerk or others lifting technology. The scouts are required to climb on the wood and bamboo to complete the building process without supporting equipment like chairs, table, ladder and others. Everything will done in conventional method to climb on wood or bamboo and tight lashings with ropes.

A Land surveyor will be engaged to measure the height of the scout pioneering tower right after it is built. The measurement device is total station with laser beam (an optical instrument used in modern surveying). Beside this, measuring with string can be done by hold the string end at the tower top and let it vertical with the other end to reach the ground. The length of the string from tower top to ground can be measured with measuring tape. The measured length will be the tower’s height and reconfirmed with the height measured by total station with laser beam. The record will be based on the total height of the scout pioneering tower.

The aims and objectives of the project are:

The current record for the tallest structure is the Tallest Bamboo Twin Tower Replica measuring 30.69m tall. To break this record we have to build 1/5 taller than the current record. Our tower will measure 120 Feet or 36.58 m.

 

Itinerary for building tower
Day 1 – 17 May 2008
Day 2 – 18 May 2008
Day 3 – 24 May 2008
Day 4 – 25 May 2008
Day 5 – 31 May 2008
Day 6 – 1 June 2008
Day 7 – 2 June 2008
Day 8 – 3 June 2008
Day 9 – 4 June 2008

Below are the sketch of our tower and sample of tower build using mini gadjet.

Side View

Up View

 

Design Calculation of 100ft Wooden Tower

1 Length of “Bakau” wood can hold 90kg. (tested with wood on horizontal & vertical position)

Resultant force on the wood

Let F=force acting on each length of woods.

Resultant force of basic unit cell with four-pod,
= 4F+4Fcos30˚+8Fcos18.5˚

Resultant force of basic unit cell without four-pod,
= 4F+8Fcos18.5˚

Trestle support on level 0-16ft
=16Fcos45˚+8Fcos45˚+ ((16+8+4+4)Fcos45˚)
=16Fcos45˚+8Fcos45˚+2(16)Fcos45˚)

Trestle support on level 16ft-28ft, 28ft-40ft
=16Fcos45˚+8Fcos45˚

Trestle support on level 40-52ft, 52-64ft, 64-76ft, 76-88ft
=8Fcos45˚
additional vertical pole
Resultant force on the wood of level 0-16ft                                          
=12(4F+4Fcos30˚+8Fcos18.5˚)+16Fcos45˚+8Fcos45˚+96F+2(16)cos45˚
=144F+48Fcos30˚+96Fcos18.5˚+56Fcos45˚
=(144+41.57+91.04+39.6)F
=316.21F

Resultant force on the wood at level 16-28ft
=12(4F+4Fcos30˚+8Fcos18.5˚)+16Fcos45˚+8Fcos45˚
=48F+48Fcos30˚+96Fcos18.5˚+24Fcos45˚
=(48+41.57+91. 04+16.97)F
=197.58F

Resultant force on the wood at level 28-40ft
=12(4F+4Fcos30˚+8Fcos18.5˚)+16Fcos45˚+8Fcos45˚
=48F+48Fcos30˚+96Fcos18.5˚+24Fcos45˚
=(48+41.57+91. 04+16.97)F
=197.58F

Resultant force on the wood at level 40-52ft                              outer trestle
=4(4F+8Fcos18.5˚)+8Fcos45˚+2(16Fcos45˚)  + 4F                           Additional vertical main pole
=20F+32Fcos18.5˚+40Fcos45˚
=(20+30.35+28.28)F
=78.63F

Resultant force on the wood at level 52-64ft
=4(4F+8Fcos18.5˚)+8Fcos45˚
=16F+32Fcos18.5˚+8Fcos45˚
=(16+30.35+5.66)F
=52.01F

Resultant force on the wood at level 64-76ft
=4(4F+8Fcos18.5˚)+8Fcos45˚
=16F+32Fcos18.5˚+8Fcos45˚
=(16+30.35+5.66)F
=52.01F

Resultant force on the wood at level 76-88ft
=4F+8Fcos18.5˚+8Fcos45˚                 outer trestle
=(4+7.59+5.65)F
=17.24F

Resultant force on the wood at level 88-100ft
=4F+8Fcos18.5˚
=(4+7.59)F
=11.59F

Weight loaded on the structure

Let w=Average weight of  “Bakau” wood. » 15kg

Weight of  “Bakau”  wood on level 16-28ft & 28ft-40ft
=[12(20w)    +     16w           +8w]x2           +80w+60w+10w +3(13w)            +2(14w+6w) + 8(3.5w)
(FP unit cell) (outer trestle) (inner trestle) (platform)             (bottom cross)    (railing)         (ladder)
=          785w

Weight of  “Bakau”  wood on level 28-40ft only
=[12(20w)    +     16w            + 8w]                 +60w+10w    +2(13w)             +14w+6w  + 4(3.5w)
(FP unit cell)   (outer trestle) (inner trestle)     (platform)     (bottom cross)       (railing)   (ladder)
=          394w

Weight of  “Bakau”  wood on level 40-52ft
=[4(16w)    +   2(16w)         + 8w]            +30w             +5w                 +8w        + 4(3.5w) + 4w(center)
(unit cell) (outer trestle) (inner trestle) (platform)    (bottom cross)  (railing)      (ladder)     (add. pole)
=          165w

Weight of  “Bakau”  wood on level 52-64ft
=[4(16w)    +8w]          +30w             +5w                 +8w       + 4(3.5w)        = 129w
(unit cell)   (inner)    (platform)    (bottom cross)  (railing)               (ladder)

Weight of  “Bakau”  wood on level 64-76ft
=[4(16w)    +8w]          +30w             +5w                 +8w      + 2(3.5w)        = 122w
(unit cell)   (inner)    (platform)    (bottom cross)  (railing)             (ladder)
Weight of  “Bakau”  wood on level 76-88ft
=16w            +8w                   +5w              +w                    +2w        + 2(3.5w)         = 39w
(unit cell)   (inner trestle)    (platform)    (bottom cross)  (railing)   (ladder)

Weight of  “Bakau”  wood on level 88-100ft
=16w            +8w                    +5w             +w                    +2w        +2w                 +w    +  3.5w
(unit cell)  (inner trestle)    (platform)    (bottom cross)  (railing)  (top finishing) (pole)   (ladder)
= 38.5w

            Total weight of ropes=200kg
Total weight of tyre tube=50kg
Total capacity of holding 100 people=100x50kg
=5,000kg

Net weigh on level 16ft=785w+165w+129w+122w+39w+38.5w+200kg+50kg+5,000kg
=1,278.5w+5,250kg
=1,278.5(15kg)+5250kg
=24,427.5kg -> 239.634kN

Net weight on level 28ft=394w+165w+129w+122w+39w+38.5w+3/4(200kg+50kg+5,000kg)
=887.5w+3,937.5kg
=887.5(15kg)+3,937.5kg
=17,250kg -> 169.226kN

Net weight on level 40ft=165w+129w+122w+39w+38.5w+1/2(200kg+50kg+5,000kg)
=493.5w+2,625kg
=493.5(15kg)+2,625kg
=10,027.5kg ->98.37kN

Net weight on level 52ft=129w+122w+39w+38.5w+(8/11x1/2)(200kg+50kg+5,000kg)
=328.5(15kg)+1,909.1kg
=6,836.6kg -> 67.07kN

Net weight on level 64ft=122w+39w+38.5w+(5/11x1/2)(200kg+50kg+5,000kg)
=199.5(15kg)+1,193.2kg
=4,185.7kg -> 41.062kN

Net weight on level 76ft=39w+38.5w+(2/11x1/2)(200kg+50kg+5,000kg)
=77.5(15kg)+477.3kg
=1,639.8kg -> 16.09kN

Net weight on level 88ft=38.5w+(1/11x1/2)(200kg+50kg+5,000kg)
=38.5(15kg)+238.64kg
=816.14kg -> 8.01kN

Net weight on level 100ft=3w=3(15kg)=45kg -> 0.4415kN

Holding strength (F) required for each vertical pole (“Bakau” wood) on every level as below:
Level 0-16ft ;               F = 24,427.5/316.21    = 77.251kg
Level 16-28ft ;             F = 17,250/197.58       = 87.306kg
Level 28-40ft ;             F = 10,027.5/197.58    = 50.752kg
Level 40-52ft ;             F = 6,836.6/78.63        = 86.946kg     
Level 52-64ft ;             F = 4,185.7/52.01        = 80.479kg
Level 64-76ft ;             F = 1,639.8/52.01        = 31.529kg
Level 76-88ft ;             F = 816.14/17.24         = 47.34kg
Level 88-100ft ;           F = 45/11.59                = 3.883kg

Conclusion:
This requires holding strength on a single vertical pole (“Bakau” wood) which is below 90kg.
\         The tower design allows total weight of 24,427.5kg load on level 16ft & 100 persons with average weight of 50kg can step on at the same time.