by Anti corrosion and insect prevention of wood in order to prevent the wooden structure of ancient buildings from being damp, decayed or mothed, the following measures should be taken during maintenance: first, improve the ventilation and moisture-proof conditions from the structure to keep the wooden structure dry.
2、 Wood structures that are susceptible to moisture, decay or moth eaten shall be treated with anti-corrosion and insect proof agents.
Requirements for anti-corrosion and insect control agents: 1.
They should be able to prevent corrosion, kill insects, or repel pests, and have high and lasting efficacy; 2、 It is harmless to human beings and animals and does not pollute the environment; 3、 It has no combustion supporting, frosting or corrosion effect on wood, colorless or light color, and has no effect on paint and color painting.
The anti-corrosion and insect proof agents for wooden structures of ancient buildings should be selected according to table 5.1.3, or other low toxicity and high-efficiency agents can be used.
If tung oil is used as moisture-proof preservative, 5% sodium pentachlorophenol or pyrethrin should be added.
Anti corrosion and insect prevention treatment of key parts I.
local treatment of non falling frame works 1 Rotten treatment of column base surface: after removing rotten wood, apply high-content water-soluble paste around the column base and seal it with bandage to make the agent penetrate and diffuse inward.
2.
Column foot rot treatment: it can be fumigated with chloropicrin.
When applying medicine, the periphery of the column base must be sealed, and the medicine should reach the center of the column base.
# once applied, the efficacy can be maintained for 3 ~ 5 years, and the dressing can be changed regularly when necessary; 3.
Treatment of column head and its socket; The concentrated liquid medicine can be injected into the column head and socket by injection method to allow it to penetrate and diffuse naturally.
2、 For the treatment of wooden columns in the falling frame overhaul or relocation project, whether the old columns are continued to be used or new columns are replaced, the immersion method should be adopted for treatment, and the validity period of one treatment should be considered as 50 years.
The anti-corrosion or insect prevention of purlins, rafters and buckets in ancient buildings should be treated by comprehensive spraying method before re painting or color painting.
For the tenon of the beam brace and the end of the component embedded in the wall, the pierced hole injection method is still used for local treatment.
3、 The anti-corrosion and insect prevention of roof wood base should focus on the parts where the wood contacts the gray back and the components easily soaked by rain, and be treated according to the following methods: 1.
The upper surfaces of Watchboard, ridge supporting wood, angle beam and berm should be treated by spraying method; 2.
Diagonal beam, eaves rafter, eaves board and other components should be treated by pressure injection method; 3.
Agents containing sodium fluoride and sodium pentachlorophenol shall not be used to treat grey green roofs.
4、 Fast acting, harmless, odorless and irritant agents shall be used for the anti-corrosion or insect prevention of small and medium-sized woodwork parts of ancient buildings.
The following methods can be used for treatment: 1.
Doors and windows: needle injection method can be used to focus on the tenon part.
If necessary, other parts can be treated by spraying.
If the door and window is easy to rot, the injection method can be used.
2.
Smallpox and caisson: its lower surface is vulnerable to the harm of bark beetle, so fumigation method should be adopted; The upper surface is susceptible to bacterial rot, so it is suitable to be treated by pressure spray.
3.
Other small wood works with exquisite workmanship should be treated by needle injection or spraying with pyrethroids or trace agents added with anti-corrosion spices.
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