A detachable and combinable cabinet and its assembly method comprises a combinable cabinet; the combinable cabinet includes a plurality of central unit cabinets, end unit cabinets, and connecting components used to assemble a plurality of central unit cabinets and end unit cabinets together; a plurality of the end unit cabinets are respectively positioned at top and bottom of the central unit cabinets; a modular design for the central unit cabinets and the end unit cabinets allows for the combination of units with relatively few specifications to create cabinets of various heights or widths, significantly simplifying the manufacturing process and greatly reducing storage and packaging volume, which facilitates storage, transportation, and protection, saving on shipping costs. It also provides an excellent solution for the production, packaging, and transportation of extra-long, extra-wide, and oversized cabinets. Additionally, it eliminates the need for extensive welding and grinding processes traditionally required in cabinet manufacturing.

Disclosed is a framework member comprising a top-hat portion and a return portion, where the top-hat portion comprises an open brim wall, an open side wall extending from the open brim wall, a crown wall extending from the open side wall, a closed side wall extending from the crown wall and a closed brim wall extending from the closed side wall. The return portion comprises a return wall extending from the closed brim wall. The open brim wall, the open side wall, the crown wall, the closed side wall and the closed brim wall form, in cross-section, a top-hat shape and the closed side wall, the closed brim wall and the return wall form, in cross-section, a channel.

An arrangement is provided for assembling a body construction, in particular a base cabinet. At least four vertical supports each include a first fastening device for tool-free assembly of at least one first surface element parallel to the vertical support, and at least one second fastening device for tool-free assembly of at least one second surface element transverse to the vertical support.