The design and construction of greenhouse
The design and construction of greenhouses should enable them to complete their predetermined functions under specified conditions (normal use, normal maintenance) and within a specified time (standard design life). The requirements of structural design in greenhouse construction mainly include the following three points:
Reliability requirements for greenhouses
Under normal use, the structure of the greenhouse can withstand various possible loads, including loads, without deformation and damage that affect the use. During the use of the greenhouse, the structure will be subjected to various loads, such as wind load, snow load, crop load, equipment load, etc. The structure should be reliable under these loads.
The envelope structure (including side walls and roof) of greenhouse construction needs to be able to withstand loads such as wind, snow, heavy rain, hail and the impact of normal collisions during production. Enclosure structures such as glass, color steel plate, PC board should be able to under the above load, the material itself will not cause damage, and the design stress should not exceed the allowable stress of the material (tensile, bending, shear, compression, etc.). At the same time, the connection between the enclosure material and the main structure should also be reliable, and it should be ensured that these loads can be transferred to the main structure through the connection.
The main structure of the greenhouse should provide reliable support for the enclosure structure. In addition to the above loads, the main structure will also bear the weight of the enclosure structure and the main structure itself, the weight of fixed equipment, the weight of crops, maintenance personnel, temporary equipment, etc. During normal use, some of these loads may not occur at the same time, and some of them will occur at the same time. The main structure should be reliable in various combinations.
Under normal use and normal maintenance of the greenhouse, all the main structure, enclosure structure and various equipment should have the specified durability. The high temperature, high humidity, and high pH of the air in which the structural components and equipment of the greenhouse are located will affect the durability of the plant factory. The impact of these unfavorable factors should be fully considered during the construction of the plant factory to ensure that the plant factory is within the standard design life, the aging of materials and equipment, and the corrosion of the components should be within the specified range.
The main structural components and connectors of the greenhouse are treated with hot-dip galvanized anti-corrosion treatment, and the on-site installation adopts bolt connection, and no on-site welding is required. In this way, damage to the galvanized layer due to overheating of the components during welding can be avoided, and the anti-corrosion effect of the galvanized layer is ensured. The anti-corrosion treatment of the main structure of the greenhouse and the connecting parts should guarantee the durability of 18-20 years.
Internal space requirements
The inside of the greenhouse is a place for plant growth and production management activities. In addition to the space for plant cultivation, it is also required to provide sufficient space for the placement and normal operation of various production equipment, and at the same time, it should leave an appropriate space for the operation manager . Therefore, in the process of designing the horizontal, vertical and cross-section of the plant factory, it is necessary to provide space that meets the requirements for different supporting equipment, facilities and different production and operation methods required by greenhouse buildings for different purposes.