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Work Schedule Summary

1 Excavation

Define and identify manageable axis (it is advisable to begin with Urea Substation).

Begin the excavation on identified axis following the higher work easiness criterion; perform

a strategic movement of excavation equipment and subsequent tasks.

Stop at 50 cm from the bottom and supply a substitution layer.

Outline until reaching the maximum excavation depth and compact the subgrade zone by

manual means, set filling material.

Manage water by using drains and provisional sumps in order to place suction points for

motor pumps.

Start the foundation construction sequence.

Pick another core and continue with the above sequence.

Note. - According to the conditions of superficial or phreatic water, it shall be analyzed if 2 immersion

pits are set.

Figure 1. Excavation Sequence.

2 Foundations

Waterproof polyethylene setting.

Lean concrete setting.

Reinforcement Steel setting + formwork shore setting + casting to lintel level.

Continue with the next axis (following the above sequence).

Remove formworks and set up both backfilling and compacting.

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Start backfilling and compacting tasks in the first group of built foundations and so on,

always taking into consideration:

Handling of 20-cm layer and compacting with equipment of less than 10 Tons.

Execution of requested tests and correspondent approval .

Note. - According to either superficial or phreatic water conditions, it shall be analyzed if immersion

pits are removed (so only motor pumps are left, thus pumping works may start in the following

enclosure to be excavated).

3 Bracing beams, framing beams, and others.

Beginning on intervened sections to lintel level (reinforcement steel + formwork shore

setting + casting).

Start bracing beams and continue above sequence (reinforcement steel + formwork shore

setting + casting).

Begin beam construction (reinforcement steel + formwork shore setting + casting).

Finish backfilling and compacting activities as per finishing sequence.

Begin floor tile construction preparations (reinforcement steel + formwork shore setting +

casting).

Begin scaffold and temporary structures setting in order to begin masonry works.

As previous tasks are concluded, masonry works shall be begun with.

Note. - Continue with superficial water management with motor pumps.

Figure 2. Ammonia Substation Infrastructure

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Figure 3. Ammonia Substation Bracing Beams.

Figure 4. Urea Substation Infrastructure.

Figure 5. Urea Substation Bracing Beams.