Zhuhai Photovoltaic Roof Load-bearing Capacity Testing and Certification Unit, Residential Load-bearing Capacity Testing and Certification

Shenzhen, an early-established testing unit; a branch office in Guiyang; leveraging its robust technical capabilities and economic foundation, the company combines traditional expertise with new technology, employing advanced testing equipment, continuously exploring and summarizing testing techniques and methods, and developing a static strain displacement testing method for the load-bearing capacity of buildings. The company's dedication, meticulousness, and responsibility ensure the quality of its inspections. Since its establishment, the company has conducted extensive testing work around construction sites such as subway lines, highway expansions, wastewater interception projects, southern expressways, Guangzhou-Shenzhen-Hong Kong-Macau passenger专线, Wuhan-Guangzhou railway专线, cityscape renovations, and deep foundation pit construction. It has also provided safety inspections for the opening of special industries like hotels, inns, and venues, as well as participated in housing census work by the housing management department. Especially in the testing of property damage and quality disputes, the company stands on a reasonable and legal position, resulting in satisfactory conclusions for both parties and the resolution of disputes, earning positive feedback from clients. The company has also conducted a significant amount of structural testing on buildings, accumulating rich experience in structural and seismic performance testing. Additionally, the company accepts commissions from provincial and municipal courts across the province to inspect properties involved in disputes.

The company is legally registered in Shenzhen and holds a certification from the Guangdong Provincial Administration for Quality and Technical Supervision (CMA certification), allowing it to issue effective data and results to the public. We have our own laboratory with a testing office space exceeding 1,000 square meters, complete with a full range of testing equipment that has been strictly calibrated. Our operators have undergone rigorous training and are proficient in the operation and maintenance of all equipment. Main business: Building inspections, factory floor load-bearing inspections, factory safety inspections, factory acceptance inspections, factory audit inspections, steel structure safety inspections, billboard safety inspections, factory load-bearing capacity inspections, kindergarten building seismic inspections, training institution building seismic inspections, school building seismic inspections, building renovation inspections, building structural safety inspections, chimney inspections, dangerous building inspections, fence inspections, photovoltaic load inspections, and building inspection services.

Main contents and analysis of house structure and quality inspection

1 When the planar layout, quality, stiffness distribution, and lateral force components such as walls of a building are obviously asymmetric within the plane, an analysis of the adverse effects of seismic torsional effects should be conducted; when vertical structural components are discontinuous vertically or when stiffness distribution experiences abrupt changes along the height, the vulnerable areas should be identified and addressed according to the relevant requirements.

2 Inspect the structural system to identify components or elements whose destruction would cause the entire system to lose seismic resistance or the ability to bear gravity. When a building has misaligned floors or different types of structural systems connected, enhance the seismic requirements for the corresponding sections.

3 Verify the actual strength grade of the structural materials; when it falls below the specified requirements, propose corresponding seismic resistance and disaster mitigation measures.

4 The height and number of stories of multi-story buildings shall comply with the value limits specified in the respective chapters of this standard.

5 When the dimensions or cross-sectional forms of structural components are不利于抗震 (unfavorable for seismic resistance), it is advisable to enhance the reinforcement and other structural requirements for seismic resistance of these components.

The connection structure of structural components should meet the requirements of overall integrity; prefabricated factories should have a more complete support system.

The connection structure between non-structural components and the main structure should meet the requirement of not collapsing and harming people; reliable connections should be in place at entrance and exit points, as well as pedestrian thoroughfares.

8 When the construction site is located in an unfavorable location, it should still meet the relevant requirements for the foundation and substructure.

Inspection requirements for building steel structure engineering materials and welding quality include:

1. The testing unit must obtain a special steel structure testing qualification issued by the provincial or higher construction administrative authority, and obtain the corresponding metrological certification. The testing personnel must hold a Level II or higher qualification certificate for the corresponding non-destructive testing method and be registered at the construction quality supervision station.

2. The entity constructing the engineering project shall entrust a testing institution with the corresponding qualifications to conduct inspections, and both the entrusting and the entrusted parties shall sign a written contract.

3. Incoming raw materials and finished products should undergo entry acceptance. Materials and products related to safety and functionality must be re-inspected according to specifications, and a witness sample collection and delivery should be conducted by the supervising engineer (the technical responsible person of the construction unit).

1. Steel 1) The types, specifications, and properties of steel and steel castings should comply with the current national product standards and design requirements. The quality of imported steel products should meet the requirements of the design and contract specifications. 2) For steel that falls under the following conditions, sampling and re-inspection should be conducted in the presence of Party A and the supervisor, and the re-inspection results should comply with the current national product standards and design requirements: (1) Imported steel from overseas; (2) Mixed batches of steel.

⑶ Thick plates with a thickness of 40mm or more, and thick plates with Z-directional property requirements; ⑷ Steel used for primary load-bearing components in large-span steel structures with a safety grade of level one; ⑸ Steel with a requirement for re-inspection; ⑹ Steel with doubts regarding quality.

2. Fastening Standard Parts for Connections: 1) Structural connections include high-strength hexagonal bolts, tension and shear bolts, ordinary bolts, rivets, self-tapping screws, pull rivets, shot rivets, anchor bolts (expansion type and chemical type), foundation anchor bolts, and other standard fastening parts, as well as nuts and washers, etc. These should be accompanied by a quality certificate or factory inspection certificate. Their types, models, specifications, and quality should comply with design requirements and current national product standards.