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Silvertown Tunnel London UK

Silvertown Tunnel
One of the largest engineering projects in the world.

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International Award-Winning Engineering Consultants who deliver ground breaking solutions at the forefront of industry best practice.

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Ayesa is committed to becoming a net zero engineering consultancy by 2040

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On 19th October 2023, ByrneLooby will rebrand to Ayesa

ByrneLooby will officially adopt the name of its parent company, Ayesa, a global engineering and technology services provider.

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Cultivating a culture in which individual differences and the contributions of our staff are recognised and valued.

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Fostering a culture where you are encouraged to be yourself.

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Multidisciplinary team comprising of specialists across Ireland, UK and the Middle East.

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No. 1 Molesworth Street

No. 1 Molesworth Street

No. 1 Molesworth Street is a five-storey, premium commercial office building located in Dublin 2. In addition to the five stories above ground level, the building has a 2-3 level basement across the full site. The basement excavation was undertaken using a secant piled retaining wall, with low movement tolerances imposed due to the adjacent Luas Cross City light rail line. The basement piling works were undertaken by Murphy Ground Engineering, with BAM Building responsible for the main works package.

No. 1 Molesworth Street

Our Role

The construction team appointed Ayesa as their design specialist for the sub-structure works. Ayesa prepared the design and detailing of the piled retaining walls, along with the design of the temporary propping and capping beam to restrain the pile wall at high level. The secant wall solution consisted of 1200mm diameter rotary bored piles installed to depths of up to 21m below ground level. This particular pile size was adopted to minimise the number of piles required, thus accelerating the basement construction program.

Our Role


The development was being built at the same time as the new Luas Cross City Line. Ayesa were required to carefully assess the basement excavation to satisfy Transport Infrastructure Ireland (TII) engineers that the proposed works would not negatively impact their asset. Ayesa worked with the stakeholders to agree suitable construction sequences and monitoring regimes to ensure the works performed as expected.

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