Splicing pipe for installing door or window

A splicing pipe for installing a door or window, comprising a first frame profile, a second frame profile, a heat insulation strip and at least two fasteners;

• wherein
• a top of the heat insulation strip is connected to the first frame profile, and a bottom of the heat insulation strip is connected to the second frame profile;
• a first clamping groove is formed on each of two sides of the first frame profile, and a second clamping groove is formed on each of two sides of the second frame profile;
• and the first clamping groove and the second clamping groove on a same side are both configured to be connected to the door or window having glass;
• and
• at least one of the first frame profile and the second frame profile on the same side is provided with an installation groove, and the fastener is inserted into the installation groove;
• after the splicing pipe is connected to the door or window, the fastener is arranged between the door or window and the splicing pipe, and the fastener is configured to lock and fix the door or window;
• wherein at least one side of the first frame profile in contact with the fastener is provided with an engagement portion, and the engagement portion is configured to be engaged and fixed with the fastener;
• the engagement portion is serrated;
• a limiting portion is arranged on the fastener, and the limiting portion is configured to limit a position of the fastener relative to the first frame profile.