Enter the code 1 2 3 4 5 6 for the reinforcement level

The type and code of the reinforcing bar: grade (i.e. Q235 Guangyuan rebar), grade (16 manganese herringbone rebar), grade (25 manganese silicon herringbone rebar), grade (garden or thread bar), grade (thread bar).

Cold-drawn rebar, cold-drawn rebar, cold-drawn rebar, cold-drawn rebar, cold-drawn low-carbon steel wire.

Reinforcement is divided according to the function:

1. Stressed ribs: Mainly subjected to tensile stress (usually called main reinforcement) acting on the area of bending and eccentric compression members, it is divided into straight ribs and bending ribs.

2. Stirrups: fix the position of the stressed ribs, bear a part of the oblique tensile stress, and use them in the beam and column.

3. Erection bar: fix the position of the stirrup in the beam, form the steel skeleton in the beam, and set the upper part and centipede bar.

4. Distributed ribs: It is used for the vertical arrangement of the stressed ribs of the slab (roof, floor) and the slab, evenly transmits the weight to the stressed ribs, fixes the position of the stressed ribs, and bears the shrinkage and temperature stress perpendicular to the direction of the slab span.

5. Others: structural reinforcements, waist reinforcements, embedded anchor reinforcements, suspension reinforcements, etc. Hooks, half-garden hooks, straight hooks of steel bars.

The cross-sectional diameter of the reinforcement is determined to be several times the length of its hook area.

Such as: set 12 hooks (.

10 hooks (.

Straight hooks are usually bent in length no more than 1 3 of the thickness of the plate.

The lap length of the steel bar: the joint position of the stressed rib should be staggered from each other, and the length of the binding method shall not be less than 300mm or 30d; The welding method, the length shall not be less than 500mm or 30d, and it should be welded on both sides.

Protective layer: beams, columns with a minimum thickness of 25mm; The minimum thickness of the board and wall is 10 15mm; The net distance of the beam by the stressed ribs should not be less than a d or 25mm.

Lap method of reinforcement:

1. Binding method; 2. Welding method; 3. Flash welding (contact butt welding) without sleeve; 4. Electroslag pressure welding (arc pressure welding) has a sleeve; 5. Mechanical connection of cone thread. It can connect 16 40 steel bars of the same diameter and different diameters, save 5 8 times of reinforcement than lashing (50d), save 58 times more electricity than single-sided lap arc welding (10d), and improve work efficiency by 9 times; 6. Rolling straight threaded steel bar mechanical connection; 7. Sleeve extrusion mechanical connection.

Steel lap and quality, cost have a direct relationship, what method is used is very particular, a 20-storey building consumes various types of steel bars thousands of tons, each ton of steel bar has hundreds of joints, the cost of each joint from ten yuan to dozens of yuan, you can imagine how much processing and lap costs are needed? What technology, process, construction method can be used to save how much steel, auxiliary cost (electricity) labor cost?

How did this come to this?

Dear, I'm glad to answer for you: the rebar level symbol is only one to four levels one, two, three, and four rebar symbols: grade 1 steel; Grade 2 steel has a small horizontal bar added below on the basis of grade 1 steel ( ); Grade 3 steel: add a vertical bar in the upper circle of the foundation hall of grade 2 steel; Grade 4 steel: On the basis of grade 3 steel, the letter "r" in the upper right corner.

There are three common ones, 1 3 grades, the representative type is HPB235 HRB335 HRB400, and there are four grade steel, which is not used for a long time in the project. From the production process is divided into cold rolling and hot rolling, as well as the processing technology has cold drawing and engraving to divide: the symbol of 1 grade car steel, is a circle in the addition of 1 vertical 2 steel symbol, is a circle in the addition of 1 vertical and then a horizontal, plus at the bottom of the symbol of 3 grade steel, is a circle in the addition of 2 vertical and then add a horizontal, plus at the bottom of the top is hot rolling, cold rolled symbol, is a circle, add a small Z on the circle, the type is HRB33 cold drawn and engraved wire and cold rolling similar, is to change Z to lowercase B, The type is HRB335, and the type is not divided by material, but by the allowable tensile stress of the steel bar.

Hello dear, I'm glad to answer your question about rotten! The symbols of 1234 grade steel bars are: grade 1 steel; Grade 2 steel has a small horizontal bar added below on the basis of grade 1 steel ( ); Grade 3 steel: add a vertical bar to the base circle of grade 2 steel; Grade 4 steel: On the basis of grade 3 steel, Zheng Da stares at the letter "R" in the upper right corner.

There are many ways to represent the symbol of the reinforcement, and in different constructions, the representation methods are also different, and the rebar (rebar) refers to the steel steel for steel and reinforced concrete and prestressed reinforced concrete, and its cross-section is circular and 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.

Summary. There are three commonly used materials for steel bars: HRB335, HRB400 and HRB500, and the welding rods are naturally different for different material strength grades; However, if the versatility is taken into account, the J557 electrode can be taken, and the strength level is equivalent to that of HRB400, taking into account the upper and lower strength levels; If you also want to take into account the corrosion problem, you can choose J576CUCRNI weathering steel electrode, and the general ordinary electrode refers to acid carbon steel electrode (such as J422).

What are the symbols of grade reinforcement?

Hello, I am glad to answer for you The grade reinforcement symbols are shown in the figure below. I hope you find my reply helpful! Have a great day! Be in a good mood every day! Thank you!

What electrodes are used for steel bar welding?

What brand of electrode is used for steel bar welding from level 1 to 4, J or E.

There are three commonly used materials for steel bars: HRB335, HRB400 and HRB500, and the welding rods are naturally different for different material strength grades; However, if the versatility is taken into account, the J557 electrode can be taken, and the strength level is equivalent to that of HRB400, taking into account the upper and lower strength levels; If you also want to take into account the corrosion problem, you can choose J576CUCRNI weathering steel electrode, and the general ordinary electrode refers to acid carbon steel electrode (such as J422).

That means that the J-shaped electrode can weld HRB400 steel bars? Don't need to use an E-prefix electrode?

Yes. I don't understand very well, last year on the construction site supervision required to use the E-word welding rod, J422 welding electrode was not allowed to use, that fooled me.

Hello, I don't know what material you are talking about steel bar, if it is Q235 steel, use E43 type welding rod (GB T 5117), when welding materials of different strengths, use steel matching with lower strength grade.

The steel bar used in our project is HRB235

hrb335

hrb400

Please, I won't bother you anymore.

J50 is also available.