KOP PERUSAHAAN

METHOD OF WORK IMPLEMENTATION

BAROMBONG BRIDGE

1. Preliminaries / Overheads
This work includes the preparation of contractor facilities, such as the construction of a
base camp, office, barracks, workshop, and warehouse. Bringing/mobilizing the required
equipment to the work location and demobilizing it after the completion of all work.
Bringing in personnel as needed and approved by the Management. Setting up field
laboratories that can be used during the construction period. Preparing the required
reports and construction drawings.

2. Demolition
Refers to the methods and procedures used for dismantling or demolishing a wooden
bridge. Here are some general steps that are typically followed in the process:
a. Planning and preparation: This involves assessing the condition of the bridge,
determining the appropriate equipment and tools needed, obtaining necessary
permits, and ensuring safety measures are in place.
b. Removal of deck and railings: The wooden deck and railings are usually removed
first. This can be done by unscrewing or cutting the fasteners holding them in
place.
c. Dismantling of support structures: The support structures, such as beams and
columns, are then dismantled. This may involve cutting or removing bolts, nails,
or other fasteners.
d. Removal of foundations: If the bridge has concrete or other types of foundations,
these need to be removed as well. This can be done using excavation or
demolition techniques.
e. Cleanup and disposal: Once the bridge is completely dismantled, the debris and
materials are cleared from the site and properly disposed of.

3. Soil
For excavation work, the material used is selected granular backfill placed on
marshy soil. Granular fill material selected on marshy ground and in situations where
saturation or flooding cannot be avoided, shall consist of rock, sand, gravel or other clean
granular material with a maximum plasticity of 6 %.
The embankment used for the construction of Baronbon Bridge consists of : Sand – not
less than 75% maximum dry density. Other than sand – not less than 98% maximum dry
density.
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For normal excavation, rock excavation work, and structural excavation work, the final
settlement, alignment and shape after excavation must not exceed 2 cm as specified in the
drawings or as directed by the construction director at each point.
Heavy equipment for soil removal, compaction, or other purposes shall not be moved
closer than 1.5 meters from the edge of the foundation excavation of a trench or structure
for a pipe culvert, unless a pipe or other structure is installed in the excavation. must not
be installed or operated in The pit was filled and compacted with materials approved by
site management.

Cofferdams, barriers, or other drainage means in the excavation area must be

sufficiently sturdy to prevent sudden collapse that could quickly flood the work area.

When workers and other people are on an excavation site with their heads sometimes
below the surface, the service provider should always have safety personnel monitoring
the progress whose sole responsibility is to ensure safety and security. Must be placed on
site. Spare excavation equipment (unused) and first aid equipment must be kept at the
excavation site throughout the excavation period.

All public excavations must be equipped with warning signs and appropriate barriers
(barricades) to prevent workers and others from falling into them. Additionally, to ensure
road safety, all open excavation pits on traffic routes or on the side of the road must be
fitted with white painted barrels (or similar) with red or yellow lights, as directed by the
construction manager. additional night signs should be installed in the form of user.
All excavated materials or sources of materials used by the service provider shall be left
in a level and tidy condition with stable edges and slopes and adequate drainage.

If the excavated material is to be transported over a distance of more than 5 kilometers to

a final disposal site or to the intended landfill site as directed by the site manager, the
existing volume of material moved per kilometer from the excavation site shall be
calculated in cubic meters. payment must be calculated. Kilometers to the construction
site of the final storage or filling site.

In the case of soil reinforcement, it is recommended to refer to the geotechnical report

first, especially when strengthening the soil using piles or other methods, before installing
a stone foundation.

4. Bridge Girders (w/o slab)

The K-350 deckless bridge girder construction method is a method of
constructing a bridge using K-350 bridge girders without using slabs. This method
involves several steps and considerations to ensure the structural integrity and stability of
the bridge. In order to obtain the desired concrete mix composition (K-350 concrete),
material tests must be carried out in advance in the laboratory. Once the expected
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composition has been achieved, it is also important to ensure that the concrete mixing
equipment is calibrated according to the agreed rules or specifications.
Before starting the injection, do not forget to install the formwork first. Next, prepare the
concrete mixture to be applied to concrete slabs, beams, support beams, brace beams, and
railing/handrail supports.
Technical implementation of reinforcement works :
A. Preparatory Work :
 Preparation and submission of workshop drawings for reinforcement
works using bright steel and threaded steel.
 Approval of materials used.
 Site preparation.
 Preparation of working materials including : Rebar, wire mesh, etc.
 Preparation of work equipment including : tape measure, electric drill,
rebar cutter, rebar bender, string, etc.
B. Reinforcement Work :
 Reinforcement and assembly will take place in a more convenient place.
 The assembly must match the execution drawing.
 Next, install the main bars, but before installing the brackets, mark the
main bars with chalk.
 And then, assemble the stirrups by connecting each intersection between
the main bars and stirrups with cross tie wire.
 Once the rebar is installed, the prefabricated rebar is transported to the
installation site.

5. Access Ramp
This access ramp project consists of :
a) preparatory work;
b) soil reinforcement;
c) masonry;
d) embankment work;
e) box culvert installation;
f) mortar/paving stone work;
g) handrail installation, etc.
At first stage, the following preparations are made : Re-bar (240), Re-bar (320),
Formwork, 9mm class II wood, Pipe PVC "AW" 100mm (4 inch), U-ditch precast 200 X
200 X 1200 mm, Nonwoven geotextile, Galvanized Iron 3" Pipe , Box culvert precast
400 x 400 x 1200 mm & 600 x 600 x 1200 mm.
And then, subgrade reinforcement is installed to support the foundation and
superstructure using bamboo piles as reinforcement. The material used is bamboo with a
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diameter of 8 to 12 cm. Once materials are available at the sterilized site and work can
begin, excavation rigs will be prepared to push the bamboo from above and drive it into
the ground as construction reinforcement. Each bamboo pile is driven individually into
the designated area as shown in the drawing. This process continues until the specified
amount is reached.
Stone Mansory work, consist of :
 Excavation of masonry is carried out based on the planning drawings. The
work can be done manually or using heavy equipment such as excavators.
 Before applying the first layer of stones, level the bottom of the
excavation pit and install a foundation made of a mixture of cement and
sand with a thickness of at least 3 cm.
 Large stones are installed at the corner of the foundation or first layer and
masonry.
 Place the stones horizontally with their longest sides aligned with the
visible or outermost side of the installed stone wall. The used stone is
cleaned and soaked for a while evenly to allow the water to penetrate.
 Gaps and spaces between the stones are filled with mortar made from
cement and sand according to the specified mix composition. Mortar can
be made with a concrete mixer or by hand. To determine the required
amount of sand and cement, you can read our separate article on
calculating the amount of stone, sand and cement for masonry.
 Drill drainage holes every 2 meters along the length of the masonry unless
otherwise specified by drawings or site management. A leak hole can be
made by installing a PVC pipe with a diameter of 100 mm.
 The seams between the stones on the surface are almost flush with the
surface, but do not cover the surface of the stones.
 Remove all material residue from the construction site.
 If desired, the surface of the masonry can be covered with a layer of
plaster to make the surface smooth.
Handrail construction begins with reinforcement work, which is carried out or
assembled according to existing construction drawings. The steel diameters used are 8
mm and 12 mm.
After the reinforcement is completed, the installation of formwork for casting can be
carried out. The dimensions of the formed handrail post are 15x15cm.
It is important not to forget to install anchors in the form of L-shaped elbows (made of
steel with a diameter of 12 mm) as a connection between the handrail and the chamfer.
When poured, it produces concrete grade K-350.