Roofing photovoltaic roof bearing capacity how to detect and identify - Database & Sql Blog Articles

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How to test and identify the bearing capacity of roof photovoltaic roof:
How to carry out inspection and appraisal of roof photovoltaic roof bearing capacity, the company is approved by Shenzhen Municipal Administration for Industry and Commerce to establish a building project with housing safety appraisal, construction engineering quality inspection, construction engineering structural design and reinforcement, house cost and damage assessment qualification. As a comprehensive specialty, the procedures for installing a solar photovoltaic power station are not complicated. If a resident who intends to build a station brings an individual to the business window of a nearby power supply office, the relevant application procedures can be processed, and the power supply department will formulate and provide an access plan free of charge. The PV modules required for the construction of the station need to be purchased by the applicant. The manufacturer that produces the PV modules is responsible for the installation. The power supply department will conduct tracking services in a timely manner, and finally complete the acceptance check, load test, and grid connection. At the same time, the power supply department and the customer signed a contract for the use of electricity for residential photovoltaic power generation projects. Technical service group company. The group company specializes in building related technical services based on housing safety appraisal, building structure design and R&D, and house reinforcement. The major covers housing safety appraisal, house safety testing, house damage trend detection, house (small and medium school house) seismic capacity test, construction surrounding house safety appraisal, industrial and commercial registration and industrial and commercial annual house safety appraisal, dilapidated house appraisal, house addition, expansion and Change the use of the identification, post-disaster (fire, flood, wind, earthquake) housing safety appraisal, civil and industrial plant construction and structural design, housing reinforcement design, housing damage assessment and other engineering construction areas. How to carry out inspection and identification of roof photovoltaic roof bearing capacity, look for Shenzhen Zhongzheng Engineering Technology Co., Ltd., undertake the national business scope, provide free technical consulting services, contact telephone number, 15999691719 Manager Li

First, how to carry out inspection and identification of roof photovoltaic roof bearing capacity:
Before carrying out the roof load detection, we must first understand the construction and structure of the factory; determine the size, weight, running load and layout of the equipment by site survey to understand whether the used load of the plant layout equipment area meets the original design requirements, and view the structure. Whether the layout is reasonable and whether the component transmission force is direct or not, the concrete strength data is obtained by pumping a part of the concrete component core sample to the third-party inspection unit for pressure test, and the load bearing capacity of the floor is checked by computer modeling. Detect whether the crack is generated in the identified area, and analyze the cause of the crack and the damage caused to the structure. According to the test of the mechanical properties of the structural material of the house, according to the existing load, the use situation and the house structure system, according to the test results, the original design drawings, the country Standardize, etc., establish a reasonable calculation model, check the existing safe use ability of the house and review its structural measures, and rigorously prepare the housing safety appraisal report; and put forward the weight detection and identification of the factory roof, combined with the weight information parameters of the equipment, etc. Reasonable PV equipment placement advice

Second, how to carry out the detection and identification of the roof photovoltaic roof bearing capacity - case analysis:
This time, the STK module of the structural calculation program PKPM (V3.1) of the China Academy of Building Research was used to model the typical rigid frame (1-7/E axis) according to the measured structural arrangement and the cross-sectional dimensions of the components. Carry out structural bearing capacity verification.
(1) The original structural load check calculation results show that under the original structural load of the plant, the bending moment of the steel column and the ratio of the flexural bearing capacity after buckling and the in-plane stability stress ratio are all less than 1, satisfying the calculation requirements of bearing capacity, GZ2 The out-of-plane stability stress ratio of GZ6 is greater than 1, which does not meet the calculation requirements of bearing capacity; the bending moment of steel beam and the ratio of strength to bending capacity after buckling, the ratio of in-plane stability stress and the out-of-plane stability stress ratio are all less than 1, satisfying the bearing Force calculation requirements. The out-of-plane stable slenderness ratio of GZ2 does not meet the requirements of the specification, and the length-to-fine ratio of the remaining components meets the requirements of the specification. The results of the calculation are shown in Figure 5.
(2) Increasing the load of photovoltaic panels on the roof. Under the action of adding photovoltaic panels to the roof, the bending moments of the steel columns GZ3 and GZ4 are considered to be the ratio of the flexural bearing capacity after buckling, the in-plane stable stress ratio, and the out-of-plane stable stress ratio. 1, meet the bearing capacity calculation requirements; GZ1, GZ2, GZ7 in-plane stable stress ratio is greater than 1; GZ2, GZ7 in-plane slenderness ratio does not meet the calculation requirements; GZ2, GZ5, GZ6 out-of-plane stable stress ratio is greater than 1, does not meet the bearing Force calculation requirements; GZ2 out-of-plane length ratio does not meet the calculation requirements. The in-plane stability stress ratio, the out-of-plane stability stress ratio, the applied bending moment and the ratio of the flexural capacity of the steel beam after considering the buckling are all greater than 1, which does not meet the calculation requirements of the bearing capacity. The results of the column check are shown in Table 10.2, and the results of the check can be seen in Figure 6.
Under the original load, the stress ratio and stability of the main frame of the steel structure meet the requirements of the basic load; the fine ratio in the long plane of the component satisfies the calculation requirements; some steel columns have insufficient out-of-plane stability stress, and the out-of-plane aspect ratio does not meet the requirements of the specification. problem. After the roof load is changed, the GZ1 in-plane stable stress ratio does not meet the load usage requirements. The GZ2 in-plane stable stress ratio and the corresponding slenderness ratio, out-of-plane stabilizing stress ratio and the corresponding slenderness ratio do not meet the load use requirements, GZ5, GZ6 The out-of-plane stable stress ratio does not meet the load requirements. The GZ7 in-plane stable stress ratio and the corresponding slenderness ratio do not meet the requirements. The ratio of the bending moment of the steel beam to the flexural bearing capacity after buckling exceeds the limit. The calculation of the purlins meets the original load requirements before and after the roof load change. The wind column calculation does not meet the original load requirements.

Third, how to carry out the detection and identification of the roof photovoltaic roof bearing capacity - take the steel structure factory as an example:

I. New application of non-destructive testing technology for building steel structures

Ultrasonic phased array scanning detection technology is developed based on the principle of phased array radar technology. The principle of transmitting ultrasonic waves for nondestructive testing is the same as that of ordinary ultrasonic testing, but the probe is composed of a plurality of piezoelectric wafer units. Controlling the phase of the sound waves emitted by each array element enables control of the ultrasonic sound field. Since the technology adopts the dynamic focusing and sound beam angle scanning technology, the detection efficiency and sensitivity are greatly improved, and the detection result is more intuitive. At present, there are still some obstacles to the application of this detection technology, such as equipment metering, use standards, personnel training, etc., but with the maturity of the technology, its application will be common in the detection of building steel structures.

There are many welds in the steel structure of the building. Since the weld itself has certain process evaluation standards, the weld quality can be first detected by visual inspection and measurement. At this time, visual inspection (VT) technology is used. By visual inspection, the appearance of the weld can be first detected, and the appearance defects such as undercuts can be found, and after further grinding, other detection techniques are used for further inspection. Visual inspection technology is a kind of non-destructive testing method that is highly valued internationally. However, it has not received enough attention in the domestic non-destructive testing. In the future, the application of this testing technology needs to be continuously strengthened.

Second, the construction type of steel structure, which is characterized by its light weight, high strength and anti-deformation, is widely recognized by the construction industry and is widely used in various construction projects.

The use rate of steel structure in a country has become one of the indicators of the country's economic development level. The more steel structure facilities it has, the higher the economic and technological level of the country. In China, with the completion of the steel structure of the “Bird's Nest”, the main venue of the 2008 Olympic Games, steel structure has become one of the types of buildings that people are very sought after.

There are three common steel structure inspection techniques, followed by simulation experiment technology, destructive experiment technology and non-destructive testing technology. The simulation test technology is the process of detecting the simulation of steel structure products. That is to say, in the process of detection, a series of simulation means are used to produce an experimental model similar to the actual steel structure, and at the same time, the actual environment in which the experimental model is located and the pressures that may be suffered by the experimental model are simulated. The experimental model is tested in this way, and the performance of the tested steel structure is determined by measuring the performance of the model. The simulation experiment is a kind of experimental method with high reliability. Because the simulated experimental model and experimental environment are real and intuitive, the test results are less controversial. However, due to the long detection period of the simulation experiment and the high technical difficulty of the detection, the detection technology has obvious practical defects.

Fourth, how to carry out inspection and identification of roof photovoltaic roof bearing capacity - the company undertakes the following national business scope:

1, Shenzhen housing lease test and appraisal report (factory, shop, office building - leasing house security test report)

2, plant structure safety test and appraisal report

3, building quality testing and identification

4, bridge structure safety appraisal

5, dangerous house safety appraisal

6, structural safety inspection before building real estate license

7 , Factory (foreign enterprise inspection and appraisal)

8. House inspection and identification before the renovation of the factory building

9, billboard steel structure detection and identification

10, chimney structure detection and identification

11, nuclear power plant building inspection and identification, chimney structure safety testing and identification

12, building change use testing and identification

13, structural testing and identification after fire

14, school seismic identification

15, kindergarten structure safety test

16, building capacity test

17, structural safety inspection and identification before building reinforcement

18, steel structure engineering testing and identification

19, quality inspection and identification before new building acceptance

20, dormitory structure safety testing and identification

21, teaching building structure safety testing and identification

22, foundation test

23, hotel, hotel (doing special industry structure safety inspection and appraisal report)

24, game hall, entertainment venue, animation city (structure safety testing and identification)

25, construction site sampling test identification

26, building frame structure safety testing

27, glass curtain wall inspection and identification

28, energy saving detection

29, building addition, layered structure bearing test

30. Hospital-outpatient (structure safety testing and identification)

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