Chongqing Chensen Building Material Co., Ltd.



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Chongqing chensen building materials co. LTD

The don always:

Manager li:

Address: no.9, building 11, zone 3, zengjia timber market, shapingba district, chongqing


How to pick the keel

The keel is a product commonly used in the construction industry. When selecting the keel strip, it is necessary to inspect all aspects of the entire keel strip to ensure that the keel strip does not present various problems when it is used.

It is important that the keel strip is visually inspected at the time of selection. From the aspects of color, finish, wrinkles, cracks, scratches, knots, scars, insect bites, corrosion, etc., all are issues that need to be checked. Put the two pieces together and see if the splicing surface is neat and uneven. Whether protective materials are used on the surface of the building block. Beat the product by hand and listen carefully to the sound. Good construction wood will make a crisp and harsh sound. The moisture content of the keel strip is basically normal between 8% and 12%, and cracking and warpage do not occur during use. The weight of the keel block can be measured by hand. If the water content is large, it must be heavier. Place your hand on top of the keel and feel its humidity. Long nails can be used to try to nail into the keel. If it is easy to nail it in, it means that the keel strip is relatively dry. On the contrary, the humidity is higher. During the storage, transportation and use of construction timber, it is often affected by pests. The natural enemies of wooden buildings are termites, longhorned dragons and elephants.

If the keel strip is not properly protected, it will be destroyed by these pests, thus affecting the quality of the keel strip. If it is an outdoor wooden building, preservatives should be impregnated so that the preservative penetrates into the keel fiber, making the wood green from the inside to the outside, resistant to corrosion, and resistant to insect attacks. The discoloration of keel strips is mainly caused by chemical discoloration and fungal discoloration. Chemical discoloration is caused by the interaction between wood and chemicals, which is caused by fungal organisms that invade wood. The deformation of the keel strip is mainly due to the warpage deformation generated during processing, drying and storage. Deformed keel strips have a certain impact on quality. In fact, edge spalling and decay have a major impact on the use of building materials in the field. In order to increase the profitability of wood processing in the highly competitive wood industry, some wood processing plants process a large number of square bark, accounting for more than 30%. Some of them have serious triangular phenomena, which lead to the lack of intelligent sawing after timber construction, which increases the consumption of wood at the construction site and increases the cost of wood.

A small portion of the imported logs will rot. Some wood processing plants are not well controlled, and inferior rotten logs are mixed into good building logs for sale. When the water content is lowered below the fiber saturation point, the strength of the building material increases, resulting in a significant increase in the bending strength and compressive strength in the particle direction, but less influence on the tensile strength in the particle direction. Above the fiber saturation point, the strength is basically a constant value, so the less water, the higher the strength, the better the quality of the building materials. The durability of building timber is the stress that the building timber is subjected to under long-term loading. In a short period of time, the ability to resist external damage becomes the ultimate strength. If the external force applied to the building timber is longer, the greater the ultimate strength, the better the quality of the keel strip . The higher the temperature, the softer the gel between the keel fiber and the wood fiber tends to soften, resulting in a decrease in compressive strength. Therefore, it is necessary to store the construction keel strips at an appropriate temperature to avoid storage at high temperatures. Grab is an important reference for measuring the quality of building materials. This is what we often call "eat nails." The holding keel gripping force refers to the fixing nail hole of the nail after the nail is inserted into the keel strip. If the nail is easy to fall off, the grip of the wood is weak. Pinus sylvestris is very popular in the construction industry because of its powerful characteristics.