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Wood construction project construction quality approval standard
One of 14 architectural engineering construction quality approval standards recently promulgated which as People's Republic of China Ministry of construction, "Wood construction Project Construction Quality Approval Standard" (GB50206-2002) the official issue (hereafter referred to as "Approval Standard" in April 25, 2002), and implemented officially in July 1, 2002. "Approval Standard" had pointed out in its foreword part this standard revision content, namely ¡°increased light wood construction one chapter to use to approve 1~3 plywood structure housing the quality.¡± This indicated that, from July 1, 2002, has the national stipulation construction quality approval regarding the light wood construction construction to be standard.This caused the recent years to puzzle some developers and the construction business question continuously finally can solve. The light wood construction is refers uses in 1~3 housing or does not surpass 4 apartments, uses the specification material to make the wall bone, the rafter, the joist, connects the specification material built-up beam with the nail to make the ceiling king post or the ridge pole; Uses the wooden base structure plate to make the floorboard, the roofing board and the wall kneading board.When construction, is not bigger than the wall kneading board nail in the spacing 610mm the side to stand on the wall bone to compose the framed wall, the supporting by the king post, the ceiling and the ridge pole which the joist and the floorboard are composed, the joist, the room lid which the rafter and the roofing board compose, and adds the essential supporting system and the shearing force wall. According to ¡°examines comments the separation, the strengthened approval, perfect method, process control¡± the policy and "Architectural engineering Construction Quality Approval Unification Standard" GB50300-2001, "Approval Standard" the sixth chapter of topic ¡°the light wood construction¡± has mainly provided the light wood construction material and the construction approval standard.Among them, the compulsory article 6.2.1st request regarding each tree seed, the stress rank, the specification size should the draw an item at random 15 full scale test samples carry on the side at least to stand is bent experiments, whether examines its bending strength to achieve the stipulation.The master control project 6.2.2nd request specification material material quality must conform to the Table 6.2.2 stipulations.6.2.3rd article requests the wooden base structure plate to be supposed to carry on the centralism load, the impact load and the even cloth load is bent experiments, its least limit load and the most large deflection should conform to the Table 6.2.3-3 stipulations.The 6.2.4th article request uses in connecting the light wood construction each kind of wire nail to be supposed to carry on is bent experiments the determination yield strength, its smallest yield strength should conform to the Table 6.2.4 stipulations.All these stipulations, had fundamentally guaranteed the material strength and other related targets satisfy the design and the use need. The lumber took the most ancient natural building material, widely uses in by the people constructing since long ago in the structure.