شركة امينسا جروب
خدمة عقود مقاولات الهيكل الاسود
Black Structure Contract System
For concrete works, floor building works and earthworks
Introduction
The "black structure" system is a common system in construction contracts, and it refers to the implementation of basic works of the project, such as excavation, concrete works, and buildings, without final finishes. This system is used in residential, commercial and industrial projects as the first stage of construction, where the building is delivered in its initial construction condition, allowing the owner or contractor to contract with other parties to complete the final finishes according to the required specifications.
First: The concept of the black temple contract
The "Black Structure" contract includes the implementation of the basic elements of the building, such as: - Excavation works: site preparation, excavation of foundations, and soil transfer. - Concrete works: implementation of foundations, columns, concrete walls, ceilings, and stairs.- Building works for the floor: Building walls with bricks or blocks without final finishes such as plaster or paints. This type of contract is based on the completion of basic works only, while electrical, plumbing, finishes, and decorations are carried out at later stages through separate contracts.
Second: Stages of implementing a project under the black structure system
1. Stage of preparatory work
- Study engineering plans and approve them from the competent authorities.
- Prepare the site and conduct a topographic survey.
- Provide the necessary materials and equipment to start the works.
2. Earthworks
- Determine the locations of foundations based on structural plans.
- Digging the site to reach the soil suitable for construction.
- Carrying out backfilling and leveling works after laying the foundations
3. Concrete works
Foundations: Pour ordinary and reinforced concrete bases according to engineering designs.
Concrete columns and walls: Implementation of columns using wooden or metal formwork.
Ceilings: the use of solid slabs, holocor or hordi system.
Stairs: Implementation of concrete stairs according to planned.
4. Floor building works
- Building walls using bricks or blocks without carrying out final finishes.
- Leaving the necessary openings for doors, windows and sanitary facilities.
Third: Advantages and disadvantages of the black chassis system
Features
Reduce initial costs: It is an economical option as the cost of the structure is only paid without finishes.
Flexibility in finishes: Allows the owner to freely choose materials and interiors later.
Reduce engineering hazards: The building is delivered after the structure is completed, reducing the need for later structural modifications.
Speed of implementation: It is allowed to start finishing works immediately after the completion of the structure.
Defects
- The project is not completed in a ready-to-live or usable form.
- The possibility of delays in finishes due to contracting with different contractors.
- The possibility of quality variation between the structure and finishes due to their implementation by multiple parties.
Fourth: Factors affecting the cost of the Black Temple contract
Project space and design: The more complex the design, the higher the cost.
Soil type: Hard soil may need special equipment for digging, which increases the cost.
Building materials: The choice of different types of concrete or block affects the price.
Geographic location: Labor and transportation costs vary by region.
V. Contractual Considerations of the Black Structure System
Accurately define the scope of the works: clarify the works covered by the contract to ensure that there are no ambiguities.
Clear timetable: specifies the duration of implementation and the different stages.
Quality Guarantees: The contractor must undertake to carry out the works according to the standard specifications.
Payment terms: Reimbursement is often made in stages associated with the progress of work.