With the development of construction technology, there are more and more irregular problems in doors, windows and openings. At the same time, their installation requirements are also increasing. These non-standard problems affect the installation process and quality of doors and windows, such as seepage, leakage, deformation and so on. At present, the better solution is to install the enclosure. The function of enclosure for doors and windows is very simple, that is to say, it plays a role of fixed length and positioning, but enclosure also has strict requirements in installation. If it is not installed properly, it will bring security risks. In today's market, there are many kinds of door frame materials, such as steel, aluminium alloy, wood and so on. If the material selection of accessory frame is not appropriate, it will also have some impact on the quality of door and window installation. In recent years, a new type of composite material, plastic-wood composite material, has appeared in the domestic market, which has developed rapidly in some southern provinces of China. The reason for its momentum is a series of properties such as compression resistance, waterproofing, high environmental protection, and so on. At the same time, the advantages of waterproofing, moisture-proof, environmental protection and recycling of Plastic-wood composites also make it have a huge development space in the construction industry.

At present, the assembly building advocated by the state requires more and more stringent products for building windows. However, the current production mode of building windows and the installation method commonly used in engineering have greatly limited the improvement and development of building windows. At present, the current situation of the installation of doors and windows is mainly in the construction of doors and windows and openings. The size of the openings is not standardized, uneven, installation of standard frames or special frames, in the decoration stage or after the completion of decoration, the use of standard methods of overall installation, easy to standardize the production of large quantities of building windows and doors. Doors and windows are the access between indoor and outdoor. They not only require beautiful windows and doors, but also require the functions of leakage prevention, energy saving and material reduction, and not easy to deform. Installation of enclosures can improve these requirements, so installation of enclosures in buildings not only improves the comfort of indoor environment, but also improves environmental protection. There are many kinds of materials for enclosure, such as steel enclosure, aluminium alloy enclosure and wood enclosure. Plastic wood enclosure is a kind of plastic enclosure.

During construction, holes will be left in the places where doors and windows are set. In order to determine the size of doors and windows and ensure the installation quality of doors and windows, frames are usually installed. After the installation of the attachment frame, indoor and outdoor decoration and door and window hole closure can be carried out. Although the attachment frame is trapped in the wall after installation, it does not belong to the components of the door and window, it is separated from the door and window, and it is also separated during installation. When the attachment frame is installed at the entrance of the tunnel, a circle of cracks will be left between the walls. If the cracks are not sealed properly, the leakage of the building wall will occur. Therefore, the sealing effect of the cracks is the key to the installation and construction.

nstallation method of enclosure

Attached frames should pay attention to methods in installation, otherwise improper installation will have problems of infiltration, non-sealing and affecting the quality of doors and windows. The installation method of general enclosure is suitable for steel, aluminum alloy and plastic wood enclosure. This paper briefly introduces some installation methods of general enclosed frames: 1) enclosed frames must be processed in factories and assembled according to the design dimensions of drawings; 2) enclosed frames should be installed preferably before indoor or outdoor painting is completed; 3) enclosed frames should be inspected before installation to check the size of doors and windows and the size of enclosed frames. Suitable, if not suitable, it should be changed in time. 4. After temporarily fixing the frame around with wooden wedge, it should adjust the level, verticality, in and out position of the frame and meet the size deviation requirements of relevant regulations.

Key Points of Waterproofing for Frame Installation

If the gap between the enclosure and the wall is not handled properly, it will cause bad sealing of the building wall and easy to leak. Therefore, we should pay attention to the key points of crevice waterproofing. Firstly, to choose the structure form of the enclosure reasonably, the structure form has the same height inside and outside, and the same height inside and outside. It is necessary to ensure that the structure form with the same height inside and outside is chosen. Otherwise, the structure is unreasonable, resulting in the failure of the sealing between doors and windows and the enclosure; or the rainwater flows into the enclosure and then penetrates into the room. Secondly, it is necessary to reasonably choose the connection mode between the enclosure and the wall, and the improper choice of the connection mode will easily create a gap, and the gap will increase with the change of temperature. For the wide attachment frame, expansion bolts can be used to connect the wall, and nails can be used to connect the narrow attachment frame. At the same time, when connecting with the wall, try to avoid the side effects of bending or deformation of the attachment frame; finally, the problem of gap filling. Although the structure form of the attachment frame and the connection mode between the attachment frame and the wall are reasonably selected, there will still be gaps between the attachment frame and the hole, so filling materials need to be selected. Usually, foam is filled, and then sealant is used to seal the gap. This way can effectively seal and waterproof. Only by doing well in the above three aspects can the attached frame play a waterproof and sealing role after installation.

Nowadays, there are few codes for the installation of enclosed frames in our country, so we can only do well the installation requirements and waterproof points of enclosed frames according to the existing codes and engineering experience. The choice of frame material is also a problem worthy of attention. This paper presents a new type of composite material - plastic wood composite material. The physical properties of this material make it have many advantages in the construction industry. Although there are still many unsolved problems, there is no doubt that it will bring about environmental benefits. Therefore, as a new type of frame, the development prospects of Plastic-wood frame are enormous.