Culvert Construction Procedure
SE – Site Engineer
TO – Technical Officer
PPE – Personal Protective Equipment
QAE – Quality Assurance Engineer
ME – Materials Engineer
TS – Technical Specification
|Man Power||Equipment/ Tools||Materials|
|SE||1 No. Back Hoe Loader (if necessary)||15 mm thick Plywood Sheets|
|TO||1 No Excavator||50 x 50mm and 50 x 25mm timber Reefers|
|Survey helpers||Concrete Mixer||Grade 15 & 25 Concrete|
|Supervisor||Dump Truck||Reinforcement Steel [Y10mm,Y12mm,Y16mm, Y25mm, 6mm]|
|Skilled & Unskilled laborers||Rammer Compactor||Binding wire|
|Leveling Instrument||Polythene film|
|Water Pump||Mould Oil|
|2 Nos. Poker vibrators( 1 is standby)||Gunny Bags|
|Wheel Barrows||Backfill Material|
|Timber Planks/ Steel Plates||Cover Blocks|
|Hand Tools||6”×4” Rubble|
|Hydraulic Breaker (if necessary)||PVC Pipe(Type 600)|
|Metal for stone packing|
4.0 Quality Control Procedure
4.1 Material sampling and testing.
The materials Engineer would take the samples from required materials such as concrete and soil according to the specified frequency and locations.
Concrete: in concrete, one set of cubes would be made per 10 cu.m of concrete. At least one sample would be taken on each day that a particular grade is used. Crushing strength of the concrete cubes would be tested for the samples at ages of 7 and 28 days. Each sample would be identified by identification No and it is displayed on the test cubes and a same identification No would be included in the sample register. The identification tag includes, the date of cast, age of test and date of test to be performed.
4.2 Inspection Check list
To ensure that the all activities being performed with the expected quality, an inspection check list would be filled by the person in charge for the reconstruction of Culvert in case of Pre-construction, during construction and post construction. The inspection check list shall include the specific requirements, safety and environmental measures. Inspection checklist for culvert construction
4.3 Dimension Control
All specified lengths, widths and heights would be properly maintained during culvert construction and all these dimensions would be checked with the inspection check list. In case of identifying the undesirable changes in specified dimensions and even beyond the specified tolerances, the particular work would be reworked before the subsequent work.
5.0 Methodology of Work
Methodology flow chart and the work would be carried out for only half of the culvert first and second part would follow the finish of the first part.
5.1 Removal of Existing Structures
Existing structures would be removed with prior approval of the Engineer and as per the Technical Specification.
1. This work consists of the necessary excavation for foundation of culverts, head walls, wing walls and other structures.
2. Necessary diverting of streams, construction and subsequent removal of necessary
coffer dams,sheet pile driving, shoring, dewatering, pumping and removal of any obstructions for placing the foundation, backfilling, clearing the site of debris and the disposal of excess excavated materials would be also included in this work schedule.
3. Prior to commencement of excavation, the limit of excavation would be set out as shown in the drawings and directed by the Engineer.
4. All excess soil and other material from the excavation including logs, boulders etc would be removed from the site and disposed to the locations approved by the Engineer.
5.3 Structural & Masonry Work
1. Prior to commencement structural and masonry work, the excavated areas would be compacted to the required level given by the Engineer if necessary.
2. Concrete trial mixing, sampling and testing would be carried out as mentioned in Technical Specification and accordance with the BS 1881 standard and subsequently all the test results would be submitted to the Engineer for approval.
3. Subsequently form work of base and re-bar would be carried out according to the construction drawings and the base would be made with a grade as instructed by the Engineer and concrete would be thoroughly compacted by vibration.
4. Concrete would be placed in such a manner as to avoid segregation by means of chutes and the displacement of reinforcing bars and would be spread in horizontal layers where practicable.
5. All concrete surfaces would be kept wet for 7 days after placing concrete.
6. Abutment and wing wall would be constructed by using random rubble or concrete up to the level of capping beam with providing weep holes as per the details given by the Engineer.
7. All the exposed surfaces of RRM would be plastered with cement mortar.
8. As done in the base all the procedures would be carried out for constructing the capping beam as per the construction drawings.
9. Having completed all the necessary work in placing reinforcing bars and form work, the deck would be concreted with a grade as instructed by the Engineer.
10. The surface of the deck would be kept wet for at least 7 days after placing concrete.
11. No temporary loads would be placed on the deck. Deck slab would be opened to traffic after the Engineer’s direction and not sooner than 28 days after the placing of the concrete has been completed.
1 No. Water Tanker