The purpose of construction engineering inspection and appraisal is to make conclusions about the quality of construction engineering and provide a basis for reinforcement design. Its implementation procedure is to investigate the status quo of the quality of construction projects, including status inspection and data investigation. On the basis of the investigation, it is determined that the work content, methods, and implementation steps of the inspection should be determined, that is, to formulate the inspection and appraisal plan, and communicate with the entrusted The party signs the contract, then conducts on-site inspections and draws conclusions.
Therefore, the working procedure of construction engineering inspection and appraisal is very important, which involves the perfect management of engineering inspection and appraisal work and the quality control of the whole process. After passing the inspection, the complete quality control data will be collected, and the chief supervisory engineer will organize all parties participating in the construction to conduct a branch inspection of the main project. Only after passing the inspection can the decoration project stage be entered.
What part is to be inspected for the structural entity?
For important parts related to the safety of concrete structures. For example shear walls, columns, beams, slabs bearing loads, and secondary structures are not important parts involving structural safety.
Who are the participating units and personnel for structural entity testing?
Under the witness of the supervision engineer, the project technical director of the construction unit will organize the implementation. Entrust a laboratory with corresponding qualifications to carry out structural entity testing, and the testing work is generally undertaken by the structure of the laboratory.
What is the main content of the test?
On-site testing of concrete, mortar, masonry strength, concrete thickness detection, structural performance testing of concrete prefabricated components, and mechanical performance testing of post-embedded parts.
Method for testing the strength of concrete
Non-destructive (i.e. rebound method, ultrasonic method) or local destructive method (i.e. drilling core sampling), based on the strength of the test block under the same conditions.
Requirements for the concrete thickness detection
The structural parts are jointly selected by the supervisor, the construction unit, and other units (the usual practice at the construction site is to be selected by the laboratory).
A number of components: Beams and slabs, each of which is 2% of the number of extracted components and not less than 5 pieces.
The thickness of the protective layer of all longitudinal tendons shall be inspected for selected beam members, and no less than 6 longitudinal tendons shall be selected for inspection of selected plate members.
Permissible deviation requirements for the thickness of the protective layer of longitudinal tendons: +10mm, -7mm for beam components; +8mm, -5mm for plate components.
What is the structural entity detection equipment:
01. Concrete strength and uniformity testing instruments
The resiliometer has been used to test the compressive strength of concrete, and it is the most widely used non-destructive testing equipment for concrete compressive strength on-site.
The basic principle of the resiliometer is to use a spring to drive the heavy hammer, and the heavy hammer hits the bullet rod in vertical contact with the concrete surface with constant kinetic energy so that the local concrete deforms and absorbs part of the energy, and the other part of the energy is converted into the rebound kinetic energy of the heavy hammer when all the kinetic energy of the rebound is converted into potential energy, the weight rebounds to the maximum distance, and the instrument displays the maximum rebound distance of the weight in the name of the rebound value (the ratio of the maximum rebound distance to the initial length of the spring).
The rebound method is the fastest, easiest, and most economical test for the quality and strength of concrete.
Penetration Concrete Strength Tester, Penetration Mortar Strength Tester
The penetration method is based on the depth of the nail penetrating into the concrete (mortar) and the relationship between it and the compressive strength. The leverage method is used to penetrate the nail into the mortar or concrete. By measuring the depth of the nail Penetration depth, the on-site detection method combined with relevant strength measurement curves to convert the strength
02. Rebar inspection and cover measurement
The reinforcement scanner uses the principle of electromagnetic induction and uses a multi-coil layout. The coils are regularly charged by current pulses, thus generating a magnetic field. After the conductive material enters the magnetic field, eddy currents are
reverse magnetic field. The instrument uses the resulting voltage change to measure and can be used to detect the position, spacing, distribution, and direction of steel bars in concrete structures and components, the thickness of the concrete cover, and the diameter of steel bars.
It is suitable for the anchoring force detection of various anchor rods, steel bars, expansion bolts, and other anchors. It can also be used for on-site pullout force detection (test) of glass curtain walls. It is an ideal testing instrument for various quality inspection units.