In the field construction process, it is often encountered that the intersections of steel mesh are not all bound with binding wire, most of them are bound at intervals. You may think that there is "Jerry building" in order to save money for steel workers and wire binding materials, but do you still find that some parts don't need us to supervise the workers, and the workers are well behaved? Do you know why! Let's talk about it.
For site construction, no matter Party A, the construction company, the supervisor, etc., all quality problems, especially those on the reinforcement, we will take the basis to talk about, according to where, drawings, Atlas, national specifications and the construction scheme prepared and passed. Of course, the drawings and construction plans of each project are different, not the same. Today, I will mainly talk about whether the intersection of steel mesh should be full in the building construction manual and code for construction of concrete structure engineering, which are commonly used in most areas.
1、 Construction Manual
(1) The provisions on steel bar binding in Chapter IV and Section IV of building construction manual are as follows:
① . the intersection point of the reinforcement shall be firmly fixed with iron wire.
② Except that the intersection points of two lines of steel bars on the periphery are all fastened, the intersection points of the middle part can be staggered and fastened, but the stressed steel bars shall not be displaced. The two-way stressed steel mesh shall be firmly fastened.
(2) In the 21st and 4th sections of the building construction manual, the provisions on steel bar binding are as follows: except that the main steel bars in the column steel bars and beam steel bars are welded joints, the rest of the stressed steel bars and stirrups are bound and connected. The reinforcement shall be bound on site with No. 20 iron wire. The column and beam stirrups shall be set vertically with the stressed steel bars, and the stirrup hook overlap shall be staggered along the direction of the stressed steel bars. The intersection points of two lines of reinforcement around the slab and the whole casting layer shall be bound firmly at each point, and the intersection points of the middle part can be staggered and fastened, but the stressed reinforcement shall not be displaced. In a word, when binding, it is necessary to ensure that the position of the reinforcement is accurate, the binding is firm, the position of the reinforcement joint, the overlapping length, the thickness of the protective layer, etc. meet the requirements, and the construction shall be carried out in strict accordance with the drawings.
2、 Code for construction of concrete structure engineering
5.4.9 of the code for construction of concrete structures stipulates as follows: the detailed structure of steel bar binding shall meet the following requirements:
① . the binding lap joint of reinforcement shall be firmly bound with iron wire at the center and both ends of the joint;
② The intersection points of the reinforcing mesh on each vertical plane in the reinforcement skeleton of the wall, column and beam shall be firmly fastened; the upper reinforcement of the slab
All intersections of the mesh shall be firmly fastened, and the bottom reinforcement mesh can be staggered and fastened at intervals except for the edge part;
To sum up, I think that only the reinforcement at the bottom of the slab is alternately bound (and it is a one-way slab), and the reinforcement mesh of the shear wall wall is under two-way stress, so the shear wall reinforcement should also be fully bound. No other parts.
The above is about "whether the intersection of steel mesh should be covered up". For more information, please click Jinan Steel wholesale website http://www.jzqgc.com/