A method for strengthening and repairing the mid-span part of the rafters with random lapping heads in ancient buildings

Abstract

A method for reinforcing and repairing the mid-span part of the rafters with disorderly heads in ancient buildings. The rotten parts in the mid-span of the rafters are sawed off, and a tongue-and-groove mortise and tenon joint is carved on each of the remaining two sections of rafters to make supplementary parts, and Make Z-shaped tongue-and-groove tenons at both ends of the supplementary parts; engrave a dovetail mortise A on the upper ends of the two sections of rafters, and engrave a dovetail mortise B on the left and right ends of the supplementary part, and make two hard miscellaneous woods. A silver ingot is inserted into the tenon, and the two wings of the silver ingot are matched with the dovetail mortise A and the dovetail mortise B; use hard miscellaneous wood to make two plug boards, and carve a rectangular mortise A on the section under the original rafter; Rectangular mortise B is engraved on the end face; the supplementary parts and the original two sections of rafters are tied together by tongue-and-groove mortise and tongue-and-groove tenon. On the basis of not changing the raw materials and construction technology, the mid-span part reinforcement and repair treatment of the random arrangement of wooden rafters in the roof structure layer of ancient buildings is carried out.

Description

Technical field [0001] The invention relates to the protection and repair of the wooden structure layer of the roof of an ancient building, in particular to a method for strengthening and repairing the middle-span part of the rafters of the ancient building. Background technique [0002] The rafters are large wooden components of ancient buildings. They are placed between the purlins and the watch slabs in the beam frame, and are erected on the upper and lower purlins and trusses, arranged in a certain order, either at a right angle or at an oblique angle. There are two types of sections: round and square. Depending on its location, "rafters" have different titles, such as eaves rafters, brain rafters, flower frame rafters, etc. According to research, rafters have been used as early as the era of "building a wood as a nest", but at that time, because the roof was a straight face, the "rafters" actually acted as purlins. The drop-out roof of the Han Dynasty showed that there were...

AI Technical Summary

Problems solved by technology

Although the rotten rafters were replaced, this also exacerbated the damage to the roof of the ancient building

In addition, because the middle span of the rafters is partially decayed, regardless of whether the overall bearing capacity of the rafters meets the requirements, simply replacing them with new ones is also a great waste of building materials

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