Construction quality inspection – Construction of structural reinforcement: Is a construction activity including assessing the quality of the structure of the work, assessing the safety of the construction according to the current construction standards (TCVN) based on the results of the actual test parameters at the site; and Provide optimal solutions to organize the processing of reinforcement (reinforcement) of building components to achieve the safety capacity of the construction work in accordance with the work functions and safe operation of the works.
Work: REHABILITATION 110KV ELECTRICAL SUBSTATION – DISTRICT 8
Items: ELECTRICAL CONTROL CENTER BUILDING – FLOOR 2 AND FLOOR 3
Location: WARD 2, DISTRICT 8, HO CHI MINH CITY
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The project: has a construction scale of 8.5m x 32.82m; total height 14.7m compared to the roadbed; including 3 floors and 1 concrete roof; The work has a foundation structure, bracing the foundation wall with reinforced concrete blocks; frame structure of columns, beams and floors made of reinforced concrete poured in place.
At the time of construction of structural reinforcement, the work has tested and assessed the safety of the construction, assessing the quality of the construction structure, the columns, beams, and concrete floors poured on site have been completed and is in the construction phase.
Pursuant to regulations, standards and technical documents applicable to the construction, acceptance and acceptance process:
Construction quality inspection report and documents Design and construction drawings for structural reinforcement plan Control house of the project Renovating 110kV substation.
Vietnam standards – TCVN10307:2014: Steel structure – General technical requirements for fabrication, assembly and acceptance. Relevant current regulations.
Photo: Construction drawing plan for structural reinforcement of the Electrical control center
Photo: Construction details of the construction reinforcement plan of the Electrical control center
Photo: Construction details of the construction reinforcement plan of the Electrical control center
CONTENTS OF STRUCTURAL REINFORCEMENT CONSTRUCTION VIETSUM PERFORMED AT 110KV ELECTRICAL SUBSTATION
I. The building has many dangerous cracks on the bearing beams, so it is necessary to deal with the beam cracks first.
Construction solution VietSum implements: seal the surface of the crack (with epoxy glue TCK-1401 to seal the crack) combined with a high-pressure pump of epoxy glue into the crack about 1mm wide (with Epoxy TCk-E500 glue, apply pump into the crack)
Construction process to treat cracks at Vietsum Construction Inspection Company:
Step 1: Statistics on inspection and surface cleaning of cracks on construction structures.
Step 2: Drill holes at positions 2.0~5.0cm from the crack, cross-drill into the 45 crack, drill bits 20~25cm apart, clean the hole with a dust blower.
Step 3: Put the glue needle into the drilled holes, turn it clockwise until the needle is firmly attached to the concrete.
Step 4: Fill the surface of the crack with a special glue so that when the glue is pumped, it does not spill out.
Step 5: Proceed to inject epoxy-based glue into the crack through the pump needles.
Step 6: After injecting glue after 3~5 hours, proceed to break the pump needle, smooth the surface, clean the injection point. The sequence of construction steps is exactly according to the manufacturer’s standards and approved design.
Step 7: Acceptance completion and surface finishing (Before plastering, use wire mesh pinned to the beam surface; parameters of wire mesh, grid cell 10x20mm; mesh size 1Mx6M; weight is 1.5kg/roll; mesh thread is 0.3~0.5mm)
Photo: Statistical inspection of structural cracks
Photo: Cleaning, sanding, drilling, and planting holes at a distance of 2.0~5.0cm from the crack on the structure
Photo: Seal the cracks with specialized glue and put glue needles into the drilled holes of the structure.
Photo: Construction of high pressure epoxy glue pump through pump needles to treat structural cracks.
Photo: Witness and Acceptance of completion of structural crack treatment work.
II. After handling the cracks, the next step is to reinforce the beam structure, the 1st and 2nd floor of the building.
The project, after inspecting the quality of the work, concluded that the floor beams are not capable of bearing enough, so it is necessary to strengthen the bearing capacity of the concrete main beam with shaped steel auxiliary beams (I, H)..
Step 1: Fabrication and processing of sectional steel beams (I, H) for reinforcement (Fy = 245Mpa) and tensile testing of iron samples with correct steel strength at the request of the investor.
Step 2: Paint steel with paints of all kinds, 1 primer, 2 coatings.
Step 3: Transportation and erection of bolted steel braces to the construction site.
Step 4: Drilling and transplanting M20 Threaded Rod (Bore D24, Depth 170mm) and RamSet G5 Chemical Pump (Or similar) install M20x250mm thread (durable grade 8.8) in accordance with the design and manufacturer’s standards – (Test of tensile strength of bolt connection).
Step 5: Construction and erection of shaped steel beams (I, H) and filling the gap between reinforced steel beams and existing concrete surface (with Epoxy Bestbond Ep 752 glue, pumped into the average gap of 5mm).
Step 6: Acceptance and completion of the parties and return the site to the work for the completion of works.
Photo: Processing and transporting beams made of section steel (I, H) for structural reinforcement.
Photo: Drilling holes to implant threaded rods in the construction structure.
Photo: Installing M20 threaded rod (Bore D24, Depth 170mm) on the structure.
Photo: Carry out RamSet G5 (Or similar) chemical pump to install M20x250mm threaded rod (strength grade 8.8) on the structure.
Photo: Acceptance and acceptance completion and sealing between reinforced steel beams and existing concrete beam surface.
III. Floor load test to assess the safety of the floor beams after reinforcement
Floor load test with the goal of determining the shear resistance of floor beams after reinforcement construction to assess safety for the use and operation of the building.
Photo: Floor load test to check and assess the load-bearing safety of the building after reinforcement.
After completing the above tasks, Vietsum will prepare a report on completion of structural reinforcement construction, acceptance and confirmation of completion, and submit it to the Investor.
When your project shows signs of needing to evaluate the quality of the work, assess the safety of the construction, and the signs of structural deterioration, please contact us Vietsum Construction Consultancy and Quality Control Joint Stock Company (VCQC) to be inspected for the quality of the work and to advise on reinforcement (reinforcement) treatment solutions so that your works are safe for production and operation.
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Hotline: 090 959 8771 – Mr Nam
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