The successful construction of a project with a basement requires not only appropriate construction methods and adequate capacity in terms of equipment, manpower, and technical resources, but also a highly effective quality control procedure throughout all stages—from pre-construction preparation to the entire construction process.
PROCEDURE FOR CONSTRUCTION SUPERVISION CONSULTANCY OF FOUNDATION AND BASEMENT STRUCTURES
1 – APPLICABLE STANDARDS:
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TCVN 2682:2009 – Portland Cement – Technical Requirements.
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TCVN 7570:2006 – Aggregates for Concrete and Mortar – Technical Requirements.
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TCVN 6016:2011 (ISO 679:1989) – Cement – Test Methods – Determination of Strength.
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TCVN 7577:2006 – Aggregates for Concrete and Mortar – Test Methods.
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TCVN 4453:1995 – Concrete and Reinforced Concrete Structures – Construction and Acceptance.
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TCVN 5308:1991 – Technical Code of Safety in Construction.
Currently, the Ministry of Construction has issued the latest regulation, QCVN 18:2021/BXD (National Technical Regulation on Safety in Construction).
In principle, QCVNs (Regulations) are mandatory for application and have higher legal validity than TCVNs (Standards).
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TCVN 1651:2008 – Steel for Reinforcement of Concrete.
2 – INCOMING MATERIAL INSPECTION AND ACCEPTANCE:
a. Main materials:
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Reinforcing steel
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Ready-mixed concrete
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Aggregates for concrete: stone, sand, cement, etc.
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Water
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Other materials: waterproofing seals (waterstops), surface hardening materials, etc.
b. Material documentation review:
- Reinforcing steel:
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Delivery note: clearly stating quantity and type in accordance with the design
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Manufacturer’s quality certificate: batch number and production date must match those on site
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Test results: compliant with applicable standards and the manufacturer’s declared product quality standards
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Visual inspection: correct shape, type, and markings as per manufacturer’s specifications; properly stored, free from rust or damage
- Ready-mixed concrete:
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Supplier’s qualification documents and batching plant capacity
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Approved mix design
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Delivery note / batching ticket: indicating mixing time, mix proportions, quantity, etc.
- Other materials:
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Approval by the Employer/Client regarding type, specification, color, etc.
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Manufacturer’s batch quality certificate accompanied by quality declaration issued/recognized by competent authorities
c. Sampling and testing frequency:
- Reinforcing steel:
- Concrete:
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For mass concrete:
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One sample set per 500 m³ when the pour volume exceeds 1,000 m³
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One sample set per 250 m³ when the pour volume is less than 1,000 m³
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For large foundations: one sample set per 100 m³, but not less than one set per foundation block
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For machine foundations with pour volume greater than 50 m³: one sample set per 50 m³; still at least one set when volume is less than 50 m³
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For frames and foundation structures (columns, beams, slabs, shells, etc.): one sample set per 20 m³; for isolated structural elements with smaller volume, at least one set shall be taken when required
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For ground slabs and pavements: one sample set per 200 m³; still at least one set when volume is less than 200 m³
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For waterproofing performance: one sample set per 500 m³; still at least one set when volume is less than 500 m³
d. Testing criteria:
- Reinforcing steel:
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Bending strength test
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Tensile strength test
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Elongation test
- Concrete:
3. INSPECTION AND ACCEPTANCE WORK:
A. INSPECTION WORK:
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Inspection procedure flowchart
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Earthworks (excavation): In accordance with TCVN 4447:2012; TCVN 9398:2012; Project Technical Specifications; Approved Construction Method Statement
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Pile head breaking (pile head trimming): In accordance with TCVN 9395:2012; TCVN 9398:2012; Project Technical Specifications; Approved Construction Method Statement.
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Blinding concrete works for foundations: In accordance with TCVN 4447:2012; TCVN 4453:1995; Project Technical Specifications; Approved Construction Method Statement.
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Setting out of building axes and reference lines: In accordance with TCVN 9398:2012.
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Reinforcement works (foundations and basement): In accordance with TCVN 4453:1995; Project Technical Specifications; Approved Construction Method Statement.
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Formwork installation (foundation, basement): In accordance with TCVN 4453:1995; project technical specifications; construction method statement.
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Concrete works (foundation, basement): In accordance with TCVN 4453:1995; TCVN 9345:2012; TCVN 9336:2012; project technical specifications; construction method statement.
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Formwork removal (foundation, basement): In accordance with TCVN 4453:1995; construction method statement.
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Backfilling of foundation pits and filling to elevation ±0.00: In accordance with TCVN 4447:2012; TCVN 9398:2012; project technical specifications; construction method statement.
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Other works: In accordance with project technical specifications; construction method statement.
B. INSPECTION AND ACCEPTANCE ORGANIZATION
+ Bases for inspection and acceptance:
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Quality of reinforcement works (as per inspection records prior to concrete casting);
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Quality of concrete (based on test results and visual inspection);
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Dimensions, shape, and position of structures, embedded items, and expansion joints compared with the design;
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As-built drawings for each type of structure;
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Construction drawings reflecting all changes during construction;
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Approved documents permitting modifications to design details and components;
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Results of concrete strength tests on specimens and quality test results of other materials (if any);
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Inspection and acceptance records for reinforcement and formwork prior to concrete casting;
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Foundation inspection and acceptance records;
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Intermediate inspection and acceptance records of structural components;
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Relevant technical specifications / instructions;
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Monitoring results of settlement, displacement, etc.;
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Construction site diary / site logbook.
+ Acceptance criteria: TCVN 4453:1995
+ Inspection and acceptance procedure:
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Inspection of the subject at site: construction elements / parts of the works and construction stages;
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Verification of test and measurement results carried out by the construction contractor;
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Review of as-built drawings of the construction elements;
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Conclusion: acceptance (or non-acceptance) and approval to proceed with subsequent works;
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Requirements for rectification or other requirements (if any).
+ Inspection and acceptance documentation:
+ Notes during construction:
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Ensure occupational safety and environmental sanitation;
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Coordination with other work items / trades;
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Common defects / typical issues related to the work item.
IMAGES OF PROCEDURE FOR CONSTRUCTION SUPERVISION CONSULTANCY OF FOUNDATION AND BASEMENT STRUCTURES
COST OF CONSTRUCTION SUPERVISION CONSULTING IN VIETNAM
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VietNam construction consulting - Mr. Thang 0902.593.686
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