Aspects of Pile Design and Construction - Report Writing - Management Assignment Help

Assignment Task:

Objectives:
After completion of this assignment, students will have a complete understanding of bridge foundation design. This assignment will take students through the actual design process involved in the pile design until the construction of piles. The assignment provides an opportunity for them to understand risks associated with designs and how engineers deal with them, what engineering judgement need to be taken at various design stages and during construction. It also provides an opportunity for them to make their engineering judgements. During this exercise, students will have an opportunity to utilise related Australian Standards and RMS design guidelines and other design literature. This assignment provides a step by step approach for bridge foundation design and will develop a student’s critical thinking, analytical skills to solve a real engineering problem. This also provides an opportunity to work in a team environment and to take collective decisions.

Guidelines:
Assignment divided into six questions to reflect all aspects of pile design and construction. Step by step approach is provided. Students should read the references given.

Description of the problem:
The attached bridge elevation and plan show the proposed bridge across the environmentally sensitive creek design and construct for RMS (Roads and Maritime Services). The contract was awarded as design and built contract. The team consists of a designer and contractor. The width of the bridge is 25.0m. The bridge consists of three spans. The bridge is supported on two abutments at the embankment of the creek and two piers located within the creek. Bridge abutment consists of five numbers of cast-in-place bored piles of diameter 1050mm and connected by 1200mm wide and 1400mm deep capping beam. Bridge pier consists of a portal frame supported by single cast-in-place bored pile of diameter 1200mm at each column locations. The bridge is partially restraint in the longitudinal and transverse direction. Bridge abutments and piers are provided with scour protection. Piles will be constructed without permanent casing.

Boreholes BR-15 and BR-22 are provided with tender design documentations. After the contract was awarded, two additional boreholes BR-18 and BR-19 were drilled. Four boreholes were available during detail design. Loading on piles for tender design and detailed design are tabulated in Table 1 and Table 2, respectively.

Performance Requirements of Piles.

• Piles should be socketed into competent rock,
• The differential settlement between piles should be limited to 10mm,
• The bridge should be stable for 1:2000 year ARI flood.

Q1 Based on design data provided during the tender, you are required to design piles for tendering.
a. Plot longitudinal rock profile
b. Estimate pile lengths for tender design by considering axial load only.
c. What pile lengths are you going to provide for estimating the tender pricing?
d. Please list at least three risks involved in your answer in Q2c.
e. Against risks identified in part d, please suggests mitigation measures for each risk

Q2 Copy the table provided and evaluate the Average Risk Rating (ARR) and Geotechnical Strength Reduction Factor for piles in accordance with AS 2159 Clause 4.3.1. Please write down the reasons for each rating on the column provided in the table.

Q3 Based on design data provided for the detailed design, you are required to design piles for construction. Please use geotechnical strength reduction factor evaluated in Q2.
a. Plot longitudinal and transverse rock profile.
b. Calculate the pile length.
c. Compare against tender design pile lengths in Q1c.
d. Can you agree with your risks/mitigation identified in Q1d & Q1e. Please justify your answer.

Q4 Pile Testing
a. Please specify pile testing requirements in accordance with RMS Bridge Technical Direction. Please justify your answer.

Q5 Understanding of construction specifications and preparation of construction drawings:
a. Please name the RMS Specification of construction of cast-in-place reinforced concrete piles without permanent casing.
b. Please tabulate the information you would like to provide for piling construction.
c. Please develop at least five design notes to be provided in the construction drawing.

Q6 How to manage design issues during construction:

It was observed that during the construction of piles, encountered rock profiles were different to what was assumed in the detailed design drawing. Construction manager provided the following information to the design team.
Issue 1: At Abutment A pile No 3 & 4, encountered rock level is 1.30m lower than design

Issue 3: At abutment B, encountered top of socket material (rock) is 1.1m higher than the final design
a. What actions are you going to take to resolve the above issues? Please note that you have minimal time since construction is in progress.
b. Are you going to revise your pile lengths, if so please provide new lengths and justify your answer?
c. To alleviate similar issues in future designs, what suggestions are you going to give to your design team.

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