Construction site inspection of rebar, how to conduct on site rebar inspection

Inspection and acceptance of steel bars: pay attention to the following points: 1. Check the number of steel bars and the diameter of steel bars against the drawings.

2. Whether the arrangement of the steel bar meets the mechanical requirements (the steel bar is not placed correctly when the steel bar is laid, the upper edge should be put on the upper edge, the lower side is put down, and whether the binding and welding joints are in the lap range with small force, etc.). 3. The anchorage length of the steel bar.

Beams, plates, columns, and stirrups.

hook length) whether it meets the requirements of drawings and specifications. 4. Whether the construction meets the requirements of the construction process: whether the steel bar binding is horizontal and vertical. 5. Whether there is garbage in the steel plate, beam and wall, and whether there are obvious rust spots in the steel bar.

The level of the reinforcement, the size, the quantity, the spacing, the position, the lap length, and the thickness of the protective layer.

Formal approach:

Submitted for inspection, regardless of whether it is ** or elongated, as long as it can meet the testing standards of the laboratory for this level of steel bar, then it is qualified!!

Informal approach:

1. Measure the diameter with a ruler or use a caliper, but this is based on experience, and the diameter of the steel bar produced by each factory has a certain difference (within the allowable range).

2. Visual inspection, ** mainly rely on "pulling" and "pulling", sometimes if the thin is too ruthless, there will be obvious pull-out marks or cracks on the surface of the steel bar;

3. Test bending, as above, mainly rely on "pulling" and "pulling", which has little impact on the strength of the steel bar, but increases the hard brittleness, so it is simple to bend it with a steel bar processing machine (according to the level of the steel bar, don't want to use grade III steel to bend a 180 hook).

It can be detected by the negative tolerance measuring instrument of steel bars produced by Shanghai Bairuo test instrument, and the length and quality of steel bars can be detected at one time, which is very convenient.

First of all, see whether the specifications engraved on the steel bar correspond to the design specifications, such as engraved with 4SG16, which means that the diameter is 16 steel bars.

Cut another meter down and weigh it, compare the theoretical weight and allowable error in the specification (steel ribbed steel bar for reinforced concrete).

You can entrust a qualified inspection department to conduct the inspection. The quality inspection report he gives you is legally valid.

The rebar approach inspection is as follows:

Look at the appearance first, check whether it is deformed, rusty, dirt, etc., and return it if there is.

Secondly, look at the information, see whether the material list is consistent with the batch of the project, and then look at the steel bar sign, there should be steel bar specifications, weight, grade, manufacturer and production date, heat number, etc., and you can also use calipers to measure the diameter of the steel bar.

If all of the above are met, you will be allowed to enter the venue. Organize the inspection and sampling personnel of the supervision and construction unit to sample and submit the steel bars for inspection in batches, and they are allowed to be used after they are qualified.

It is necessary to check whether the performance of the steel bar and the label are in good condition, and when using it, it is appropriate to look at whether its tensile bending and strength are similar according to their own experience!

The focus of the quality inspection of reinforcement engineering includes three aspects:

1. Raw materials.

Second, steel bar processing.

3. Reinforcement installation.

The quality standards and inspection methods of reinforcement engineering shall be implemented in the "Code for Acceptance of Construction Quality of Concrete Structure Engineering" (GB 50204-2002) in the relevant reinforcement parts.

Raw material sampling:

When the steel bar enters the site, the test pieces should be extracted according to the provisions of GB1499 and so on for mechanical inspection product certification, performance test, and its quality must meet the provisions of the relevant standards.

Frame structures with seismic requirements:

For the frame structure with seismic fortification requirements, the strength of its longitudinal stress reinforcement should meet the design requirements. When there are no specific requirements for the design, for the first and second level seismic grades, the measured values obtained from the test should meet the following values.

General provisions: (1) the ratio of the measured value of tensile strength to the measured value of yield strength of steel bar shall not be less than; (2) The ratio of the measured value of the yield strength of the steel bar to the standard value of the strength should not be greater than.

Special inspection of chemical composition:

When it is found that the steel bar is brittle, the welding performance is poor or the mechanical properties are significant, and the chemical composition is not checked and the chemical composition is normal, the chemical composition inspection or its inspection report or other special inspection should be carried out on the batch of steel bars.

Stressed rebar hooks and bending:

1) The end of the HPB235 grade steel bar should be hooked at 180 degrees, and the straight arc should not be less than the diameter of the steel bar, and the length of the straight part of the hook after bending should not be less than 3 times the diameter of the steel bar.

2) When the design requires that the end of the steel bar needs to be hooked at 135 degrees, the arc of HRB335 and HRB400 steel bars should not be less than directly.

4 times the diameter of the steel bar, and the length of the straight part of the hook after bending should meet the design requirements.

3) When the steel bar is bent at no more than 90 degrees, the diameter of the arc at the bend should not be less than 5 times the diameter of the steel bar.

Stirrup end hook:

In addition to the welded closed ring stirrups, the end of the stirrups should be hooked, and the hook form should meet the design requirements; When there are no specific requirements in the design, the following list of provisions shall be met: (1) In addition to meeting the provisions of item 4 of the main control item of this table, the inner diameter of the bending arc of the stirrup bending bar shall not be less than the diameter of the stressed steel bar; (2) the bending angle of the stirrup hook; For general structures, it should not be less than 90 degrees; For structures with eye earthquake resistance, it should be 135 degrees; (3) the length of the straight part after stirrup bending; For general structures, it should not be less than 5 times the diameter of the stirrups, and for structures with seismic requirements, it should not be less than 10 times the diameter of the stirrups.

Rebar surface quality:

The tendons should be straight and undamaged, and there should be no cracks, grease, granular or flake rust on the surface.

Straightening of steel bars: It should meet the design requirements and the provisions of the relevant standards of the line.

1. Whether the raw materials are qualified for the retest; 2. Whether the specifications, types, quantities and protective layers used meet the design requirements; 3. Whether the anchorage length and joint position meet the requirements of the specification; 4. Whether the binding is in place; 5. Whether the reserved reinforcement is in place.

What are the contents of the steel bar approach inspection, and what items should be inspected when the steel bar enters the site.

: Represents a first-class steel bar, that is, round steel, with a diameter of 6 12mm in general engineering, which is used to make stirrups or plate reinforcements.

Check the logo, look at the appearance, measure the size.

The main inspection of the reinforcement: diameter, spacing, binding sense, the encryption area of the stirrups, the position of the waist reinforcement binding, and the protective layer of the reinforcement are also the focus, because the protective layer is not padded up.

The main body is easy to expose the ribs, and it is more important to look at the nodes of the beams and columns in a key point, and to look at the nodes of the beams and columns, the density, spacing, and the nodes of the beams and reinforcements of the columns.

Template: mainly depends on the cleanliness of the cleaning, the size, flatness, gaps, and the height of the arch of the design drawings are 3 1000, and the general description of the early drawings.

Now the supervision of all the inspection of the reinforcement should be in the beam steel bar, according to the design requirements of the beam of the steel bar all check clearly, can not miss the misplaced steel bar, and the beam steel bar anchor into the support of the anchor length is enough, the beam column node at the stirrup is encrypted, the beam has the part of the infill stirrup is encrypted? If the position of the reinforcement is accurate when the column is changed to a cross-section, whether the protective layer of the beam is correct, the most important thing is whether the reinforcement at the cantilever beam is correctly placed, and whether the stirrups are encrypted. Whether the plate reinforcement is anchored according to the atlas, whether the plate protective layer is padded, and whether the formwork is firmly reinforced.

If the floor is more than one meter and the construction plan of the high formwork is still being prepared, the formwork must be constructed according to the plan. Do a good job of supervising the side station log.