FRP bracket quality appraisal

FRP brackets take glass fiber reinforced composite materials as the core and play a key supporting role in construction, electricity, transportation and other fields. In construction projects, it is used for structural support and wall reinforcement to meet lightweight and high-strength requirements; in the power industry, it is used as a component of cable trays and towers with both corrosion resistance and insulation properties; in the transportation field, it is used in load-bearing structures of bridges and tunnels to improve project durability. Compared with traditional metal brackets, fiberglass brackets occupy a unique position in modern infrastructure construction due to their lightweight, high strength, corrosion resistance, and aging resistance. They not only reduce project costs, but also extend service life, making them an important material choice for green projects.

As the application scope of fiberglass brackets expands, quality dispute cases are gradually increasing. Judicial disputes focus on: whether the product complies with industry standards, whether there are quality defects such as insufficient material strength or dimensional deviation, and whether the defects lead to engineering accidents or economic losses. In such cases, the quality appraisal of FRP brackets has become the core link in resolving disputes. Through technical means such as material performance testing and structural strength analysis, it provides a scientific basis for the court to determine liability and loss compensation, ensuring project quality and market fairness.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for fiberglass reinforced plastic brackets. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for quality appraisal of fiberglass reinforced plastic brackets.

FRP bracket quality identification technical methods include:

1. Appearance inspection: Carefully check the appearance of the FRP bracket to see whether there are cracks, bubbles, scratches, deformations and other defects on the surface. Also check whether the color is uniform and whether the size meets the design requirements.

2. Physical performance testing: Test the density, hardness and other physical properties of the fiberglass stent. By measuring the density, we can determine whether the material is uniform; by testing the hardness, we can evaluate its wear resistance and pressure resistance.

3, mechanical property testing: Carry out tensile, bending, compression and other mechanical property tests. Test the bearing capacity and deformation of the bracket under different stress conditions to determine whether it has sufficient strength and stability to meet actual use needs.

4. Chemical analysis: Analyze the chemical composition of the fiberglass stent to determine whether the content and proportion of resin, fiber and other components are correct, and whether there are harmful impurities. This helps to judge the quality of the raw materials and the corrosion resistance of the product.

Applicant Company A and respondent Company B signed a "Fiberglass Structural Procurement Contract", agreeing that Company B would supply 2,000 sets of "corrosion-resistant FRP cable supports" to Company A. After Company A installed the brackets in the underground comprehensive pipe gallery, it was found that 23% of the brackets were broken and delaminated after 6 months of use, causing cables to fall off. Company A claimed that the bracket had quality defects and claimed for equipment maintenance and production shutdown losses; Company B argued that the break was caused by Company A's overloaded installation. Negotiations between the two parties failed and the case was brought to court, and the court entrusted a third-party appraisal agency to conduct appraisal.

identification analysis results:

The quality analysis expert group reviewed the technical agreement, production process records, and tested the mechanical properties, microstructure, etc. of the failed FRP stent samples involved, and formed the following technical results: Technical opinion:

Article 2 of the contract signed by both parties stipulates the quality requirements and technical standards: "The product should comply with the bidding documents and the quality standards and technical indicators and specifications promulgated by the state and local governments. The product performance must comply with all specified performances and meet the technical specifications and specified data. Standard; the product bearing capacity of the center point of the bracket is greater than or equal to 200KG, the oxygen index is greater than 60%, GB/T8927-88, the bending strength is greater than 140MPa, GB1449-83, and the tensile strength is greater than 60MPa, GB1447-83. 8 After actual testing, the center point bearing capacity of the FRP bracket involved was the largest at 52KG end fracture, flexural strength 33.9, tensile strength 26.3, and oxygen index 27.4

FRP bracket quality appraisal report should include the following content:

Appraisal purpose and client information

Sample information and appraisal method

Identification results

Conclusions and opinions