What are the uses, advantages and disadvantages of multi-span greenhouses?

A greenhouse is a building that can control or partially control the environment in which plants grow. It is mainly used for non-seasonal or non-regional plant cultivation, production and management, scientific research, additional breeding and ornamental plant cultivation, etc. In the northern region, it is mostly used for the cultivation or seedling raising of warm-loving vegetables, flowers, trees and other plants during low-temperature seasons. In cold regions, greenhouse agricultural technology can also be used to obtain a variety of agricultural products. Facility greenhouses are generally divided into four categories according to technical categories: multi-span greenhouses, solar greenhouses, plastic greenhouses, and small greenhouses. Today, the editor will focus on introducing the multi-span greenhouses that are widely used in modern agriculture.

Multi-span greenhouses are divided into two types: glass multi-span greenhouses and PC solar panel multi-span greenhouses. In cultivation facilities, multi-span greenhouses have a long service life and are suitable for use in a variety of regions and under various climate conditions. It is characterized by automation, intelligence, and a high degree of mechanization. The greenhouse is equipped with facilities such as thermal insulation, lighting, ventilation, sprinkler irrigation, etc., and can be used for three-dimensional planting. It is a modern large-scale greenhouse.

1. Glass multi-span greenhouse. Glass multi-span greenhouse is also called glass greenhouse. When designing the foundation, in addition to meeting the strength requirements, it must also have sufficient stability and the ability to transmit horizontal forces.

The current design of glass multi-span greenhouse steel structures in my country mainly refers to the greenhouse design specifications of the Netherlands, Japan, the United States and other countries. However, factors such as structural strength, structural integrity, and structural durability must be considered in the design. Glass multi-span greenhouses can be used as planting greenhouses, breeding greenhouses, exhibition greenhouses, experimental greenhouses, catering greenhouses, entertainment greenhouses, etc. The design of the greenhouse system includes heating system, insulation system, cooling system, ventilation system, control system, irrigation system, etc. The glass multi-span greenhouse mainly includes the basic part of the greenhouse civil construction, the main body hot-dip galvanized steel frame, the external sunshade hot-dip galvanized steel frame, covering materials, external sunshade system, internal insulation system, wet curtain-fan cooling system, top and surrounding roll film openings Intelligent systems such as window systems, sprinkler systems, power distribution systems, and drainage systems.

① Advantages of glass multi-span greenhouses. The appearance is beautiful and elegant, and the greenhouse grade is high: all-steel frame structure, advanced design, strong ability to withstand wind and snow, and a service life of more than 25 years; the internal operating space of the greenhouse is large, and it can be connected in a large area, so it is suitable for factoryization and Large-scale production operations: The greenhouse has a high degree of automation and a large space for expansion options.

②Disadvantages of glass multi-span greenhouses. Greenhouse construction costs are high and the investment cost is large; insulation in winter requires additional insulation facilities: glass is a fragile object, which poses safety risks during use. Tempered glass, etc., is expensive and is not commonly used.

2. PC solar panel multi-span greenhouse. It is mainly a steel frame structure and is mainly used for growing vegetables, fruits, ordinary flowers, etc.

① Advantages of PC solar panel multi-span greenhouse. It has long service life, good stability, rainproof, windproof and other functions, and has a high degree of automation.

②Disadvantages of PC solar panel multi-span greenhouses. Similar to glass multi-span greenhouses, it requires a large one-time investment and requires high technical and management levels: it is generally used as a substitute for commercial multi-span greenhouses and is more used for the demonstration and promotion of modern facility agriculture.