What are the requirements for the minimum length of two steel bars for welding, lapping, etc.?

What are the requirements for the minimum length of two steel bars for welding, lapping, etc.?

A: 1The minimum length of the two steel bars welded "Steel Welding and Acceptance Regulations" JGJ18-2012 has requirements:

2.The minimum length of the two steel bars for lashing lap "Code for Design of Concrete Structures" GB50010-2010 has requirements: (Because you are asking about the "minimum length", I will not answer you for earthquake resistance!)

and other specifications and atlases should be derived from this specification, and it is not interesting to repeat other specifications and atlases! Therefore, it is also exempt. What I want to ask is how small is the length requirement for two steel bars to be lapped, welded, etc.?

Metaphorically, if I want a meter of steel bar, can I weld it with a 9-meter steel bar and another meter of steel bar? Assuming the length of the weld meets the requirements, thank you! A:

It is necessary to comply with and meet the "Code for Design of Concrete Structures" GB50010-2010Bars: Rebar connections can be lashed lap joints, mechanical connections or welded.

The type and quality of mechanical joints and welded joints shall comply with the provisions of the current national standards. The connecting joints of the stressed steel bars in the concrete structure should be arranged at the place where the stress is small. It is advisable to set fewer joints on the same stressed steel bar.

In the important components and key force transmission parts of the structure, the longitudinal stressed steel should not be provided with connecting joints. The longitudinal stress reinforcement of axial tension and small eccentric tension members shall not be lashed and lapped; When the steel bars in other components are tied and lapped, the diameter of the tensile steel bar should not be greater than 25mm, and the diameter of the compression steel bar should not be greater than 28mm. Therefore, assuming that the length of the weld meets the requirements, it is still necessary to meet the above

Requirements. Welding with a 9-meter, another meter of steel bar does not necessarily meet: "less stressed" and "important components of the structure and key force transmission parts".

To put it bluntly, reinforcing steel workers should be cut and matched according to the above principles! It doesn't have to be a 9-meter-long steel bar, you can use it one by one! This is the minimum knowledge that reinforcing steel workers should remember.

1. Welding is divided into single-sided welding and double-sided welding, single-sided welding requires the welding length to reach 10 times D, and the double-sided welding welding length is 5 times the lap length of the steel bar, please refer to page 53 of 11G101-1 for details, according to the different seismic grades, the length of the lap is also different.

Welding: 10d for single-sided welding, 5d for double-sided welding

For lashing laps, see 11g101-1, p. 55.

Yes, if the steel bar is so ten or twenty centimeters apart, you have to connect it if you don't connect it. It's just that your assumption is too one-sided, because the connection position of the reinforcement is required, and the connection position should avoid the place where the force is large, such as the upper steel bar of the beam, the connection position should be in the middle of the span 1 3, and the bottom reinforcement should be 1 3 at the support, so theoretically there are few of you in this kind of batching connection, and the actual construction depends on the supervision.

The welding length should meet 10 times the diameter of the steel bar for single-sided welding, and 5 times the diameter of the steel bar for double-sided welding. For the problem you mentioned, it is okay to weld with meters of steel bar, but the premise of the problem is that if this steel bar is used in the beam, it is best to put the joint position within the allowable range of the lap.

The minimum length of lap welding (single-sided, double-sided) is shown in JGJ18-2012 "Steel Welding and Acceptance Regulations". Splitting and ribbed are different. The minimum length of the lashing lap is shown in the table on page 55 of 11G101-1. Page 53 is the anchor length, not the lap length.

JGJ18-2003 in the steel bar welding specification mentions that the lap welding lap length in arc welding is 10DDouble-sided welding is 5d.

The lap length of the steel bar is 45 decimeters, 35 decimeters, 30 decimeters, and 25 decimeters. The length of ribbed steel bars is 55 dm, 45 dm, 35 dm, 30 dm.

Rebar connections. Method: Tied and rolled connection, welded connection, cold pressing connection and spiral connection.

Except in individual cases, welded connections should be used as much as possible to ensure quality, improve efficiency and save steel. Steel bar welding is divided into two forms: pressure welding and fusion welding. Pressure welding includes flash butt welding.

resistance spot welding and pneumatic welding; Fusion welding includes arc welding.

and electroslag pressure welding.

Precautions for rebar welding.

Control the rebar welding process.

When the ambient temperature reaches -5, it is the "low-temperature welding" of the steel bar, and the low-temperature welding process of the steel bar is strictly implemented, and it is strictly forbidden to directly contact the ice and snow during the welding process.

In windy and snowy weather, the welding operation part needs to take closed enclosure and insulation measures to cool the welding part slowly to prevent the temperature of the joint from dropping too quickly after the welding is completed, resulting in cold brittleness and affecting the welding quality. Before the steel bar is welded, it must be tested according to the local construction conditions and temperature conditions, and the test can be formally welded only after passing the test.

The lap length of the steel bar during joint welding and strip welding: double-sided welding is not less than 5d (steel bar diameter); Single-sided welding should not be less than 10d, and the lap length of steel bar binding should not be less than 35d. There shall be no 2 welded or lashed joints on the same vertical section, and the welded or lashing joints of adjacent steel bars shall be staggered by more than 500mm and 900mm respectively.

As shown in the figure below:

The lap welding head is suitable for welding HPB235, HRB335, HRB400 steel bars with a diameter of 10 40mm. Double-sided welding should be used for steel lap welding. When double-sided welding is not possible, single-sided welding can be used.

Before welding, the steel bar should be pre-bent to ensure that the axis of the two steel bars is on a straight line, so that the joint has good mechanical performance.

Double-sided welds should be used when the design of welded joints is required, and single-sided welds can generally be used when there are no special requirements. For the lap welding or strip welding of grade steel bar, the total length of the weld should not be less than 8d; For the grade steel bar, the total length of the weld of lap welding or strip welding should not be less than 10d, and the length of the weld on both sides of the joint should be equal when the strip is welded.

According to the welding specifications of the rebar.

Article JGJ18-2012 "Steel Welding and Acceptance Regulations" stipulates that double-sided welding should be used when lap welding, and single-sided welding can be used when double-sided welding cannot be carried out. The lap length of the steel bar when single-sided welding is not less than 10 times the diameter of the steel bar, and the lap length of the steel bar when double-sided welding is not less than 5 times the diameter of the steel bar.

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According to the relevant specifications and standards, a lap length of 220 is sufficient for a single-sided lap weld with a diameter of 20.

The lap length of the rebar is not only related to the diameter of the rebar, but also to the material of the rebar.

Rebar grade: HPB300, in lap welding, single-sided welding 8D, double-sided welding 4D;

Rebar grade: HRB335, HRBF335, HRB400, HRBF400, HRB500, HRBF500, RRB400W, in lap welding, single-sided welding 10D, double-sided welding 5D.

Determines the material of the rebar. If it is not certain, it should be carried out according to the requirements of the higher level, that is, in lap welding, 10d for single-sided welding and 5d for double-sided welding.

Summary. Hello, according to the query of the steel bar above the secondary steel, the minimum diameter of the welding is more than 16, that is to say, 18 can be welded, 16 and below can not be welded, but there is a problem, this refers to the use of lap welding Gang bar welding requirements The construction process of electroslag pressure welding environment and welding are different from lap welding, now the specification has not been specified, it depends on the regulations of various places, Shenyang is 14 and 14 or more can be In the specification, the welding diameter of the first-class steel is also specified, and the steel bar of 10 and above can be welded, below, Only lap in addition, cold-worked steel bars, welding is strictly prohibited.

What is the size of the steel bar of the beam that requires welding, whether it must be welded or it can also be lapped. Are there any specifications? Be detailed.

Hello, I am inquiring for you here, please wait a while, I will reply to you immediately

Hello, according to the query of steel bars above the secondary steel, the minimum diameter of welding is more than 16, that is to say, 18 can be welded, 16 and below can not be welded, but there is a problem of skin cracking, this refers to the use of lap welding Gang bar welding requirements The construction process of electroslag pressure welding environment and welding conditions are different from lap welding, and now the specification also refers to no provisions, depending on the local regulations, Shenyang is 14 and 14 or more can be In the specification, the welding diameter of the first-class steel is also specified, Is 10 and above steel bars can be welded, below, can only lap in addition, cold-worked steel bars, welding is strictly prohibited.

Steel bars with a diameter of 25 cannot be lap welded under the condition of primary and secondary seismic resistance, and mechanical connection is required. Mechanical connection of rebar.

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Rebar grade: HPB300, in lap welding, single-sided welding 8D, double-sided welding 4D;

Rebar grade: HRB335, HRBF335, HRB400, HRBF400, HRB500, HRBF500, RRB400W, in lap welding, single-sided welding 10D, double-sided welding 5D.

In the "Code for Design of Concrete Structures", it is stipulated that the longitudinal stress reinforcement of axial tension and small eccentric tension members shall not be used for lashing lap joints. When the diameter of the tensile steel bar is d>25mm and the diameter of the compression steel bar is d>28mm, it is not suitable to use the lashing lap joint.

The rebar lap length is the length required for two rebar bars to pass through the lap joint. Considering this, after research and practice, researchers have introduced a correction factor greater than one multiplied by the anchorage length to compensate for the standard application, as the length of the lashing lap. Therefore, the length of the welded lap of the reinforcement = the length of the anchorage correction factor.

Take a diameter 16 steel bar as an example: a steel bar with a diameter of 16, its lap length is, so its lap length should be.

Double-sided welding should not be less than 5d (d is the diameter of the steel bar), and single-sided welding should not be less than 10d. The lap length of the reinforcement binding should not be less than 35 d.

The number of welded or binding steel bars on the same vertical section should not exceed 25 of the total number of steel bars in the section, and the welding or binding joints of adjacent steel bars should be staggered by 500mm or 1 000mm respectively. Longitudinal continuous steel bars should be set up with a lashing joint every 30m. The allowable deviation of the installation position of the pavement, bridge deck reinforcement and reinforcement skeleton shall comply with the provisions of the table.

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

Summary. The lap length of the steel bar during lap welding and gang welding: double-sided welding is not less than 5d (steel bar diameter); Single-sided welding should not be less than 10d, and the lap length of steel bar binding should not be less than 35d.

The lap length of the steel bar during lap welding and gang welding: double-sided Nian Min welding is not less than 5d (the diameter of the steel bar is ruined); Single-sided welding should not be less than 10d, and the length of the steel bar binding lap should not be less than 35d

There are four commonly used joining methods for rebar connection: tie-roll connection, welded connection, cold pressed connection and spiral connection. Except in individual cases (such as no open flames), welded connections should be used as much as possible to ensure quality, improve efficiency and save steel.

The pure joint of steel bar welding refers to two forms: volcanic pressure welding and fusion welding. Pressure welding includes flash butt welding, resistance spot welding, and pneumatic welding; Fusion welding includes arc welding and electroslag pressure welding. In addition, the welding of the T-joint between the steel bar and the embedded parts should be submerged arc pressure welding.

Arc welding has a wide range of applications, such as the length of steel bars, the welding of steel skeletons, the welding of Natan steel bars and steel plates, the welding of prefabricated structural joints and the welding of various steel structures.

There is also a relationship between the length of the street and the size of the steel bar.