System is entered on prefabricated concatenation pipe fitting top

The utility model provides a system is entered on prefabricated concatenation pipe fitting top, includes main roof mechanism and follows the concatenation pipeline that sets up on the design route ofdesign pipeline that concatenation internal diameter of the pipeline is greater than the external diameter that designs the pipeline, splices the pipeline and forms by splicing the pipe fitting concatenation, the concatenation pipe fitting be a strip shaped plate, around it two sides correspond respectively outside outstanding form the axial overlap edge about, two sides correspond outside outstanding formation circumference overlap edge respectively, coaxial concatenation pipe fitting along the axial of concatenation pipeline in through the axial overlap edge splice in proper order, with thesplicing in proper order through the circumference overlap edge along the hoop of concatenation pipeline on of the concatenation pipe fitting in week, all fasten through the connecting piece. The utility model discloses an int