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EMBEDDED RETAINING WALL

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by

Muhamad Syazwan

on 2 April 2015

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Transcript of EMBEDDED RETAINING WALL

EMBEDDED RETAINING WALL
DEFINITION RETAINING WALL
Structure designed and constructed to resist the lateral pressure of soil
The most proper installation of retaining wall is to recognize the tendency of the retained material.
It is important to have a proper drainage behind the wall in order to limit the pressure to the wall design value.
TYPE
EMBEDDED
RETAINING
WALL
Bored
Piles
King Post
Soldier Pile
Sheet Pile
Diaphragm
EMBEDDED RETAINING WALL
Gravity Retaining Wall
Cantilever Retaining Wall
Ultimate Sheet Piling
A kind of reinforced waterproofing is required for such special sheet piling projects as
rivers & bridges
off-shore
dewatering
water cutoff walls
water purification plant
drainage works
water gate
cofferdams
any other projects which encounter water leakage problems.
MUHAMMAD SADDAM BIN HUSSIN
MOHD IZWAN FAZLY BIN ISMAIL
MUHAMMAD HAMIZAN SYAHMI BIN HAMDAN
MUHAMAD SYAZWAN BIN SUTERIS
Embedded Retaining Wall
TYPE OF RETAINING WALL
TYPE OF SOIL
PILING PROBLEMS
Piling job site is located in the urban areas where both noise and vibration are prohibited or restricted
Piling job site is located close to school, hospital, private houses, etc. which do not permit noise and vibration.
Piling job site is located near rails, old buildings, historical monuments, fragile facilities, etc. to which vibration may cause serious damages.
Local law (regulations) requires less noise and less vibration.
T
H
A
N
K

Y
O
U
Geographical Difficulties
Piling job site is located in the mid town or tight residential areas where the space is so limited that conventional bulky piling equipments which require large sized cranes and other equipments can hardly enter or be operated.
Piling must be done under bridge or in limited headroom situations where conventional piling equipments can hardly work or work efficiently.
Piling is required in the river or off-shore where conventional types of bulky piling equipments with heavy cranes need a costly pontoon and tug boat with crew and extra workers, which will result in inefficient and high cost job.
Unfavorable Ground Conditions
Difficulties To Get Sheet Piles and H-Beams
Clay Soil

SITE LOCATION
NOORLAILEY BINTI AB. RAHIM
LOT 2145,
JALAN SUNGAI LONG,
BANDAR SUNGAI LONG,
CHERAS,
43000 KAJANG,
SELANGOR DARUL EHSAN
Install at wide spacing can be up up 5 to 8 pile diameter depending on soil conditions
Material using such as ‘H’ piles and timber lagging
Not suitable where high water pressures or flows exist in the soil to be retained
Simplest, fastest and cheapest type embedded retaining wall often used for temporary works
When the high reached the height of 1500mm have to install tied-back anchor to make sure the wall can be retained the pressure from earth.
Viscosity of soil is too high for conventional methods of piling.
Minute sands in the beach or seabed produce strong resistance and piles can not penetrate into the ground.
Soil contains stones, rocks, bricks or other hard obstacles.
Soil condition is too soft to hold driven piles firmly.
Due to the recent worldwide "steel crisis" the prices of sheet piles and H-beams are increasing drastically while delivery time is being extended unreasonably
Consequently, piling job cost has been badly affected.
In the worst case, piling project itself is obliged to be postponed or cancelled.
Such critical situation has caused serious damages and inconveniences.
Noise and Vibration
Waterproofing Required
CHARACTERISTICS OF SOIL
Brown colour.
Moist to the touch
TYPE RETAINING WALL
SHEET PILE
SOLDIER PILE
Construction area is too small and compact with the surrounding buildings.
Construction time can be reduced.
Construction costs are cheaper compared to other retaining wall.
Can be reduced construction labor.
Anchored Retaining Wall
EMBEDDED RETAINING WALL
Wall that penetrate into ground and rely to a significant extent or even completely on the passive resistance of the ground for their support.
Type of embedded retaining wall:
Bored Piles
Secant Wall
Interlocking Piles
Contiguous Bored Piles (CBP)
King Post Wall
Diaphgram Wal
Soldier Piles
Sheet Piles
Secant Wall
A guide wall is required for this method to ensure that piles accurately located.
Use interlocking female (primary) & male (secondary) cast in-situ piles to produce a retaining structure.
Construction is carried out sequently with primary piles installed first then secondary piles cut into the primary.
Interlocking Pile
Many ways similar to the secant wall piles method, except the gap between the primary piles is filled with a secondary ‘soft pile’

A sequence of secondary piles is constructed follow by a sequence of primary piles constructed to the full design depth, cutting into the secondary piles and reinforced in the usual manner
This form of construction ensure that water entry onto the subsequent excavation is greatly reduced.
Contiguous Bored Piles (CBP)
Formed from closely spaced bored piles for the construction of basement.
Allows excavation of the basement to proceed safely and efficiently and minimizes the need for temporary propping
This form of construction ensure that water entry onto the subsequent excavation is greatly reduced.
Cost effective system of retaining walls
Also known as Berlin Walls the simple and quick installation comprises angering a hole with CFA piling rig, filling with concrete and installing ‘H’ pile.
May be used for many different retention applications including flood defense walls
Usually used in tight spaces
Made out of steel, vinyl or wood plank which are driven into the ground
Taller sheet pile will need a tie-back anchor, or “dead-man” placed in the soil a distance behind the face of the wall, that is tied to the wall
There are permanent and temporary applications
Permanent sheet piles remain in the ground and serve as permanent retaining structures
Temporary sheet piles are designated to provide safe access for construction, and are the removed
Constructed using narrow trench excavated in ground and supported by an engineered fluid until the mud is replaced by the permanent material
Made from reinforced concrete, though unreinforced walls can also be used
Often used in congested areas or where excavation depth is very deep
Suited for deep basement , underground rail station, rail car unloader, tunnel approaches, and pumping station
When the high reached the height of 1500mm have to install tied-back anchor to make sure the wall can be retained the pressure from earth.
ADVANTAGES
DISADVANTAGES
This method provides positive trench wall support.
Contractors typically have design responsibilities.
Excavation and backfill quantities are minimized.
Access to the trench is maximized.
The shoring can help to control ground water.
Easy to install and remove.
Can be used in almost any soil condition.
The piles are expensive to buy or rent and install.
Additional equipment and material at the site congest the work site.
Additional crew operations of install and extract can cause logistic delays.
The installation and extraction can cause undue noise and vibration pollution, especially if impact pile hammers are used.
The installation and extraction process can cause surface settlement in incompact soils.
The shoring design usually requires a professional engineer stamp.
For sheet pile, the soil conditions must be fairly soft or the sheet will be damaged while being driven.
MOHD IZWAN FAZLY BIN ISMAIL
MUHAMMAD SADDAM BIN HUSSIN
MUHAMAD SYAZWAN BIN SUTERIS
MUHAMMAD HAMIZAN SYAHMI BIN HAMDAN
NOORLAILEY BINTI AB. RAHIM
2013187865
2013795881
2013115807
2013777779
2013922863
PROF. MADYA DR. ZURAIDAH BINTI ABBAS
BCM513 - CONSTRUCTION ENGINEERING III
The Contractor shall verify locations of all underground utilities before driving any sheet piling or H-beam.
Areas for the sheet pile or H-beam driven must refer to the drawing from architect.
The sheet piling must be driven using a crane or drill that does not cause noise and vibration effect.
Drilling depth for h-beam should not exceed 24 m deep.
In developing the plan for installing the sheet piles we have considered many issues including:
The presence of underground services such as water, electricity and sewers
Ground water levels outside the excavation
Noise and vibration effects upon people and buildings
Vibration effects to the hospital and the building surrounding
Disruption to pedestrian and vehicle traffic flow
Distance between the h-beam arrangement is between the range of 1 m.
Timber Lagging used in soldier pile is typically on the order of 3 to 4 inches. (79 mm to 102 mm)
After the cultivation works for h-beam completed, dredging work can begin.
Lagging installation work performed simultaneously with the excavation work.
Lagging arrangement is do from the top to bottom.
Tieback achor installation is intended to increase the strength of soldier piles resist lateral earth pressure.
Work Procedure
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