Abstract: This invention discloses a trench construction device for construction sites, belonging to the technical field of construction equipment, which solves the existing problems with low construction quality and efficiency in digging the tranches, and the trench construction device for construction sites comprises a movable base 1 and guide rails 10, an installation base 2 on the movable base 1, a planer knife 28 fixed on the installation base 2, a discharging pipe 3 fixed on the planer knife 28, a feed inlet 31 disposed on the discharging pipe 3, a discharging device disposed in the discharging pipe 3, a material tank 4 fixed on the movable base 1, wherein a discharging port 41 is disposed on a bottom of the material tank 4, a scraper 51 is fixed on the movable base 1, and a pushing belt 8 rotatably arranged between the discharging port 41 and the scraper 51; the trench construction device for construction sites is convenient and labor-saving with a higher construction quality.

Abstract: This invention discloses a descaling apparatus for steel tubes of the building scaffold, belonging to the technical field of construction equipment, which solves the existing problems with low quality in rust-removal of the steel tube of the building scaffold, and the descaling apparatus for steel tubes of the building scaffold comprises a bottom panel (1), a working table (11), a pushing base (2) on the bottom panel (1) along a length direction, several of forward rust-scraping rings (3) and several of reverse rust-scraping rings (4) on the working table (11), several of forward scrapers (33) on the forward rust-scraping rings (3), several of reverse scrapers (43) on the reverse rust-scraping rings (4), a driving member on the working table (11), several sets of rolling assemblies (5) on the working table (11); this invention has a better rust-removal effect and is more labor-saving when in manual operation.