What information is needed for the entry of steel raw materials

1. A list of incoming materials (indicate where they are used).

2. The quality assurance documents of the materials (such as: certificates, quality certificates) generally have to be provided by the material supplier.

3. The materials that must be inspected should be reported before use, which means that the materials entering the site should be sampled or retested, and even witness sampling is required.

4. Finally, attach the declaration form for the use of materials to the construction unit.

Or the supervision unit for inspection.

Material entry declaration. The following attachments are required:

1. List of incoming materials, (including factory brand, quantity, batch).

2. Factory quality assurance data (including certificates, factory test reports, etc.) 3. On-site sampling and retest data (that is, on-site inspection test reports, the results must be qualified).

Material entry declaration. The following attachments are required:

1. List of incoming materials, (including the factory brand, the number of generations, and batches) 2. The factory warranty information.

Including certificates, factory test reports, etc.).

3. On-site sampling and retest data.

That is, the on-site test report should be qualified).

The data clerk needs to fill in the application form for entry materials, and also ask for inspection reports, certificates, etc., and inspection batches with suppliers who provide steel bars.

Generally, it is done when rebar processing and rebar binding, and there is no need to write about the incoming material and reed material.

Hello dear! Glad for your question! What should be done when the materials used in the reinforcement enter the site:

1) When the steel bar enters the site, it should be straight and without damage, and there should be no cracks, oil stains, granular or flake rust on the surface. (2) When the steel bar enters the site, the specimen should be extracted for mechanical property inspection in accordance with the provisions of the current national standards, and its quality must meet the provisions of the relevant standards. (3) For the frame structure with seismic fortification requirements, the strength of its longitudinal stressed steel bars should meet the design requirements; When there are no specific requirements for the design, yes.

For the first and second level seismic grades, the measured strength value obtained from the test shall comply with the following provisions: the ratio of the measured value of the tensile strength of the steel bar to the measured value of the yield strength shall not be less than; The ratio of the measured yield strength of the steel bar to the strength standard value should not be greater than. (4) When it is found that the steel bar is brittle, the welding performance is poor or the mechanical properties are significantly abnormal, the chemical composition of the batch of steel bars should be tested or other special inspections.

Raw materials such as steel bars need to be supervised to do the following things: 1. The variety, appearance, specification, packaging, model, and land number of the rebar entering the reed yard are inspected and accepted. Verify quality certification documents, factory certificates, Chinese manuals, and performance test reports; Imported materials shall be inspected for entry and exit commodities in accordance with the relevant regulations.

2. Test items: Required: tensile test (yield point, tensile strength, elongation) bending test.

Others: reverse bending, chemical composition of 3 groups of batch principles and sampling methods: (1) the same plant, the same furnace number, the same specification, the same delivery state, every 60t for an acceptance batch, less than 60t also according to a batch (2) each acceptance batch of 2 tensile specimens, 2 bending specimens.

Cut in the optional two rebars).

The requirements of the construction site are very high, and every link is not allowed to make any mistakes, otherwise the loss is very large. So what are the requirements for the storage of steel bars at the construction site, and the problems that need to be paid attention to when steel bars enter the site, do you understand? Now let's take a look.

1. What are the requirements for the storage of steel bars at the construction site?

1. The disc round steel bar needs to be classified, and then placed on the skids according to the different categories; 2. The wooden pad or other materials used to store the steel bar need to ensure that the thickness is more than 20cm, and the distance between the support pads should be more than 2m; 3. The steel bar not only needs to be classified according to the different installation categories, but also tries to ensure that the ends of the steel bar are aligned.

Second, the problems that need to be paid attention to when the steel bar enters the site.

1. Before entering the site, the steel bar needs to be prepared: In the position of storing the steel bar, it is necessary to ensure the smoothness of the ground; A layer of gravel needs to be laid on the ground; Starting from the middle, make a drainage slope to both sides to avoid water accumulation; The skids need to be ply under the steel bar, and the thickness of the skids needs to be more than 20cm, and the spacing should be spacing.

2. The steel bars cannot be stacked at will, and they need to be placed in the appropriate position according to the designed plan. If it is said that it is placed at will for the convenience of disassembly, it will not only cause certain damage to the steel bar, but also increase the difficulty of handling in the process of construction, and the construction period will also increase, which is not conducive to the progress of the later process.

3. After the processing of the steel bar is completed, it should not be mixed in a certain storage, which is easy to increase the difficulty of the later work. Generally, the processed steel bars will be stacked according to the names of divisions, layers, sections, and components, and use labels to make clear notes, so that the construction will become simpler.

What are the requirements for the storage of steel bars at the construction site, and the problems that need to be paid attention to when the steel bars enter the site, I will introduce them here, do you understand? There are many problems that need to be paid attention to in the storage of steel bars, and only by storing them according to specifications can the quality of steel bars be ensured, and at the same time facilitate the later construction.

The base metal of the rebar is the rebar to which it is connected. The raw materials for the incoming steel bar include the base steel bar.

The types of steel bar base metal include hot-rolled park, hot-rolled ribbed, cold-rolled park, and cold-rolled ribbed.

For example, if you do a mechanical connection of 20 to 18, the base steel bar is one for each of 20 and 18.

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which has a circular cross-section and sometimes a square with rounded corners. Including round steel bars, ribbed steel bars, and torsion steel bars. The steel bar for reinforced concrete refers to the straight bar or wire strip steel used for reinforced concrete reinforcement, and its shape is divided into two types: light round steel bar and deformed steel bar, and the delivery state is straight bar and disc round.

The light round steel bar is actually the small round steel and disc round steel of ordinary low carbon steel. Deformed steel bars are ribbed steel bars with a surface, usually with 2 longitudinal ribs and transverse ribs evenly spaced along the length. There are three types of transverse ribs: spiral, herringbone, and crescent.

It is expressed in millimeters of nominal diameter. The nominal diameter of the deformed reinforcement is equivalent to the nominal diameter of the light round reinforcement with equal cross-section. The nominal diameter of the rebar is 8-50 mm, and the recommended diameter is mm.

Steel grade: 20MnSi, 20MnV, 25MnSi, BS20Mnsi. Steel bars are mainly subjected to tensile stresses in concrete.

Due to the action of ribs, the deformed steel bar has a greater bonding capacity with concrete, so it can better withstand the action of external force. Steel bars are widely used in various building structures. Especially large, heavy, lightweight, thin-walled and high-rise building structures.

Steel bar processing generally has to go through four processes: steel bar rust removal; Straightening of rebar; rebar cutting; Rebar forming.

When the rebar joint is connected by straight thread or conical thread, the upsetting and threading operation of the rebar end should also be added. Rebar batching and substitution.

Rebar substitution. 1) When replacing the steel bars specified in the design documents with another steel number or diameter, the following provisions shall be observed:

It should be carried out according to the principle of equal design value of steel bearing capacity, and the structural requirements such as the specified steel bar spacing, anchorage length, and minimum steel bar diameter should be met after the steel bar replacement.

When replacing the lower level of steel bar with a higher level of steel bar, it is advisable to use the method of changing the diameter of the steel bar rather than the method of changing the number of steel bars to reduce the cross-sectional area of the steel bar.

2) When replacing another diameter of steel bar with a certain diameter steel bar of the same steel number, the diameter change range should not exceed 4mm, and the ratio of the total cross-sectional area of the steel bar after the change to the cross-sectional area specified in the design document shall not be less than 98% or greater than 103%.

3) When the design of the main reinforcement is replaced by the same steel number, the spacing should be kept unchanged, and the two types of steel bar interval configuration can be replaced with two types of steel bar interval configuration with a diameter larger than the design steel bar diameter and a smaller level.

The base metal is determined by the structural part. For example, pile foundation, vertical large main reinforcement is the base material, spiral reinforcement, inner ring reinforcement, positioning reinforcement, etc. are auxiliary materials. For example, the longitudinal coarse steel bar is the base material, and the other reinforcements (such as stirrups) are auxiliary materials.

Visual inspection, check whether it is the designated brand, witness sampling.