Soilless Vertical Growing Vegetable Crops Venlo Style Greenhouse 4mm Glass

In addition to bearing its own weight, greenhouse glass mainly bears wind load as a greenhouse enclosure structure. In addition to bearing wind load, the glass installed on the roof slope also bears snow load and other falling object loads. If it is installed on the roof, it also needs to bear maintenance load. In addition, in modern buildings, glass coverings generally need to consider their ability to withstand thermal stress and resist man-made impact damage.
The expansion of architectural glass caused by the heating of the glass cannot occur freely due to external constraints, or due to the different lighting conditions within the glass plate, or due to the different heat dissipation conditions within the glass plate, causing thermal stress inside the glass. When the heat Thermal cracking occurs when stress build-up exceeds the tensile strength of the glass edge. Thermal cracking is a multi-factor problem that is complexly affected by the properties, quality and external conditions of the glass itself. In greenhouse production buildings, flat glass is usually used, and heat-absorbing glass is basically not used. On the basis of ensuring that the quality of the selected glass meets relevant product standards and that the installation and fixation of the glass conforms to standard procedures, the glass covering on the greenhouse can basically be ignored. Thermal stress damage.Regarding man-made impact damage, due to the special functions of greenhouses, most of them are not places with a large flow of people.
The cost of using laminated safety glass is too high and it is unrealistic to use it on a large scale. It can only be used locally in greenhouses with a large flow of people. It is best to adopt other measures (such as strengthening management, installing protective railings or flower pots and other decorations, posting eye-catching signs, keeping a certain distance between the bottom edge of the glass and the ground, etc.) to avoid the occurrence of human injury accidents caused by glass breakage. The roofs of large-scale multi-span glass greenhouses constructed in recent years are almost all made of tempered glass.

The installation structure of glass is divided into two types: frame installation structure and frameless installation structure. A framed installation structure means that the glass is supported by a frame around the perimeter, and all glass edges are required to be surrounded and closed by frame notches or grooves, and the frame has sufficient load-bearing strength and stiffness; if this requirement is not met, it is considered a frameless installation. structure. Greenhouses basically use frame-mounted structures, but in recent years, glass greenhouse roof windows designed by foreign greenhouse companies have appeared in frameless installation structures. Glass framed mounting structures consist of mounting notches or grooves on the frame and the glass mounting material.
1. Principles of glass installation: Special aluminum alloy profiles are generally used in greenhouses to fix the glass on the greenhouse frame. After glass is installed, it will inevitably be affected by wind load, rain and snow load, earthquake action or other effective loads. Due to the unique strength characteristics of glass, when the stress exceeds its elastic limit, it is different from polycarbonate plates, films and other materials that have plastic deformation. ability, but breaks immediately. In order to ensure the safety, reliability and durability of the entire installation structure, the following principles should be followed during installation.
(1) The plate surface and thickness dimensions of the glass should be determined according to the effective load strength of the glass. The maximum bending deformation deflection of the glass under load should not be greater than 1/70 of the span.
(2) The frame that fixes the glass should have sufficient strength to prevent the glass from breaking due to frame deformation. Frame deformations are generally designed to be no more than 1/180 of the span.
(3) There should be a suitable gap between the glass periphery and the frame, and the area should be filled with elastic material to avoid installation stress.

Relying on motor drive to open and close the sunshade curtain. The shading rate of the sunshade curtain ranges from 30%, 50%, 75%, and 90%, matching different climate conditions.