How to lap the lintel, lap the upper reinforcement of the beam

First, the lap method:

1. After the roof template of the main structure is removed to the second floor, the secondary structure of the first layer can be inserted.

construction (at this time, the main structure is constructed to the sixth floor);

2, the construction progress of secondary structure, must follow the construction progress of main structure, that is, the roof template of main structure dismantles one layer, and the construction of secondary structure is completed one layer;

3. After the removal of the roof template of the main structure is completed, this floor must immediately clean up the garbage, erect protection, carry out structural chiseling and repair, and secondary pouring of the upper anti-beam, railing, etc.;

4. The construction of the secondary structure must first start from the kitchen and bathroom.

Water retaining foundation construction, structural column, door frame reinforcement and tension reinforcement binding begins;

5. After the masonry of the secondary structure begins, the installation of the flue duct begins;

6. The masonry of the secondary structure shall be cleared as much as possible, and the tail item shall not be retained;

7. After the masonry of the secondary structure is completed, leave one day for the power supply professional embedded wire pipe and wire box.

Installation and fixing, the third day is the start of secondary structural plastering.

Second, a brief introduction of the lintel:

When the door and window openings are set up on the wall and the wall openings are greater than 300mm, in order to support the various loads transmitted by the masonry on the upper part of the opening, and these loads are transmitted to the walls on both sides of the openings such as doors and windows, a cross beam is often arranged on the door and window opening, and the beam is called a lintel. There are two types of lintels, cast-in-place and prefabricated.

3. Illustration of lintel:

What does lintel lap mean? How is it placed on the wall?

The lintels are generally placed on the wall 200mm at each end.

However, there are also designers who design opposite stress ribs according to different geology, which will be noted on the drawings. 2. The steel bar in the middle of the frame beam is disconnected in the span, which is called the negative moment tendon of the support in professional terms, and is commonly known as the supporting tendon in the common language! From the analysis of the force, the place where the upper bending moment of the continuous beam is the largest is the beam end, and the place where the bending moment is 0 is generally the place where the span 1 3 places, and the position of the upper reinforcement joint should be arranged at the place where the bending moment is 0, so the general upper reinforcement joint of the beam is arranged at 1 2 places of the beam span.

3. According to the provisions of the Code for the Design of Concrete Structures, stirrups should be configured within the scope of the longitudinal stressed steel bar lap and the virtual length of the state shed, and its diameter should not be less than the times of the larger diameter of the lap steel bar. I hope mine can be helpful to you, thank you for your consultation, thank you! 

Summary. 1. The lap position of the upper reinforcement of the beam is at 1 3 places at the distance from the support or when the diameter of the steel bar is less than 28, it can be lapped at 1 3 places in the span.

2. Reinforcement lap refers to the connection method in which two steel bars have a certain overlapping length with each other and are tied with wires, which is suitable for smaller diameter steel bar connections. It is generally used for the reinforcing reinforcement mesh in concrete, the warp and weft are evenly arranged, and there is no need for welding, only the iron wire is fixed.

Hello, I have seen your question and am sorting out the answer, please wait a moment Oh Wait a minute. 1. The lap position of the upper reinforcement of the beam is at 1 3 places away from the support or when the diameter of the Bilu reinforcement is less than 28, it can be lapped at 1 3 places in the span. 2. Reinforcement lap refers to the connection method in which two steel bars have a certain overlapping length with each other and are tied with wires, which is suitable for smaller diameter steel bar connections.

It is generally used for the reinforcing reinforcement mesh in concrete, the warp and weft are evenly arranged, and there is no need for welding, only the iron wire is fixed.

According to the "Code for the Design of Concrete Structures", when the ring beam encounters a window void and must be disconnected, a lintel must be set on the window, and its lap length shall not be less than twice the vertical distance and shall not be less than 1m.

GL means that there is a beam on the opening of a door, window, or reserved opening, etc., which is called a "lintel".

The ring beam is set along the horizontal direction of the masonry wall at the elevation of the cornice, window roof, floor, crane beam roof or foundation top surface of the house.

Concrete beam members with closed structural reinforcement.

It is required that the ring beam should be continuous and closed on the same horizontal plane, but when the ring beam is opened by doors and windows (such as stairwell window openings).

When partitioning, an additional ring beam should be set at the upper part of the opening for lap reinforcement. The lap length of the additional ring beam should not be less than the height difference between the two beams.

twice and not less than 1000mm

For example, a beam of 3 meters is 1 meter and 3 points, etc., if it is truncated at 1 3, then if it is lapped, it is not at the end of the beam.

Answer: Your example is not good, the beam of 3 meters is so short and you don't say whether the net span is or not! 3 aliquots (which is not usually treated as such).

Your question looks at the picture below, and your question can't find the LLE! How do you know that the lap is at the end of the beam? If you see that the lap is only 150mm, how can it reach the beam end?

3 meters of beams, plus the frame ribs, generally two ends of the face support meters, the middle frame ribs are generally meters to meters.

It should be that the center point of the lashing lap at both ends is located in the middle of the span 1 3, not the end of one of the end laps is at 1 3

It doesn't matter. Don't take it too seriously. It won't pour.

Yes, but the lap length must be greater than or equal to 60 times d (rebar diameter), and the rebar lap in the same beam.

The positions must be staggered, and the same longitudinal stressed reinforcement.

It is not advisable to set up two or more joints. The distance from the end of the head of the joint group to the starting point of the steel bend should not be less than 10 times the diameter of the steel bar.

There is another view of frame beams for frame beams, which is beams that need to be involved in earthquake resistance. Pure frame construction.

With high-rise buildings.

The rise of the shear wall structure is becoming rarer.

The frame beams are mainly the beams that participate in the seismic resistance.

According to the current national standard "Code for Seismic Design of Buildings".

Article GB50011-2010 stipulates that in the ** area, the suitable construction height of the frame structure is related to the local fortification intensity. Because the lateral shift resistance of the frame structure is lower than that of the shear wall structure, the suitable construction height of the frame structure is lower than that of the shear wall structure, and the pure frame structure is rarely used in high-rise buildings.

Summary. Hello, friend<>

There are several main ways to connect concrete beams: flange connection: the side edges of two beams are joined.

Suitable for short-span concrete beam joints. Flange connection: The upper and lower edges of the two beams are rubbed together.

Generally, it is rarely used in construction. Reinforcement anchor connection: A certain number of reinforcement bars are set at the intersection of two beams, and then concrete is poured to realize the anchorage connection.

Flange connection: A flange face with a matching concave and convex surface is prefabricated at the intersection of two beams and filled with concrete for connection. Corrugated steel plate connection:

Corrugated steel plates were installed at the intersection of the two beams, and concrete was poured to strengthen the connection. Sonau connection: The intersection of two precast beams is machined into a running-in tapered surface, and concrete is poured.

Stirrup connection: Reserve a certain length of cavity at the beam joint, then bury the annular steel bar, and then pour concrete. Large-hole nail fixing:

Holes are drilled at the intersection and settled large hole nails, and finally the holes are sealed with glue or poured concrete.

How to connect concrete beams.

Hello, friend<>

There are several main ways to connect concrete beams: flange connection: the side edges of two beams are joined.

Suitable for short-span concrete beam joints. Flange connection: The upper and lower edges of the two beams are rubbed together.

Generally, it is rarely used in construction. Reinforcement anchor connection: A certain number of reinforcement bars are set at the intersection of two beams, and then concrete is poured to realize the anchorage connection.

Flange connection: A flange face with a matching concave and convex surface is prefabricated at the intersection of two beams and filled with concrete for connection. Corrugated steel plate connection:

Corrugated steel plates were installed at the intersection of the two beams, and concrete was poured to strengthen the connection. Sonao connection: The intersection of the two precast beams of Douxiao is processed into a running-in conical surface, and then concrete is poured.

Stirrup connection: reserve a certain length of cavity at the beam joint, then bury the annular steel bar, and then pour the concrete air attack draft. Large-hole nail fixing:

Holes are drilled at the junction and large hole nails are settled, and finally the holes are sealed with glue or poured concrete old earth.

Rebar anchoring land crack connection and flange connection are the most common concrete beam connection methods, the main advantages and disadvantages are as follows: Advantages of steel bar anchorage connection: mature technology, simple construction and convenient operation.

The anchored reinforcement provides an effective bond and high connection strength. The cost is low and it is suitable for various types of beams. Cons:

It is necessary to accurately calculate the number of steel bars in advance, and the implementation of the reinforcement process requires high acres of early. It is difficult to ensure the concrete pouring thickness of the connecting node, and it is easy to have holidays. Flange connection advantages:

The connecting surface is prefabricated, there is no accumulation of dimensional errors, and the construction accuracy is high. The flange faces are complex in shape but match each other, and the connection strength is reliable. Reducing the amount of rebar used is conducive to concrete pouring and source cleaning.

Disadvantages: The flange surface processing is complex, and the prefabrication production is difficult. The cost is relatively high and requires a special mold.

It is only suitable for precast concrete beams and cannot be applied to cast-in-place beams.