The value of the rebar diameter is the original rebar diameter plus about 21mm rib thickness

Whether there is any error in the construction drawing that is prone to error, the main inspection content is as follows:

1. Check whether the slope direction of the concrete top of the parapet wall is facing inward.

2. Check whether there are beams under the brick wall.

3. Whether the reinforcement of the beam in the structural plane is fully marked in the beam table.

4. Check whether the height of the main beam is lower than the height of the secondary beam.

5. When the span of beams, plates and columns is the same and similar, there is a large difference in reinforcement, if any, it needs to be checked.

6. When the beam and the shear wall are arranged in the same straight line, check whether the width of the beam exceeds the thickness of the wall.

7. When the beam is supported on the shear wall and the column edge respectively, check whether the center line of the beam is parallel or overlapping with the axis, check whether the beam width protrudes from the wall or column, if so, it should be submitted for design processing.

8. Check whether the minimum spacing of the stressed steel bar of the beam meets the requirements of the construction acceptance specification, when the ribbed threaded steel bar is used in the project, because the worker bends the ribless surface in the steel bar processing, the value of the steel bar diameter should be the original steel bar diameter plus about 21mm rib thickness.

9. Check whether there is a canopy on the door of the indoor terrace, and check whether the center of the canopy on the structural plane coincides with the center line of the door.

10. When there is any difference between the design requirements and the construction acceptance specifications. As often stated in the column table, less than 4 column bars on each side can be lapped in the same section. However, the construction acceptance specification requires that the lap area of the steel bar of the same section shall not exceed 50%.

11. Check whether there is any contradiction between the structural description and the contents of the structural plane, sample, beam and column table, as well as the construction description.

12. The two-way stress of the separate foundation system, the stressed steel bar along the short side direction is generally placed on the top of the long side stressed steel bar, and check whether the steel bar is drawn wrong in the foundation sample drawing of the construction drawing.

How much is the original gauge distance of ribbed steel bars with a diameter of 10! Hello, I am glad to answer for you<> the original gauge spacing of ribbed steel bars with a diameter of 10 is as follows: look at the grade and diameter of the rebar, because the final lead of the original gauge spacing is to test the elongation after breaking.

6 8 10 12 14 16 18 20 22 25。In reinforced concrete structures, the crack width is also smaller than that of bare round reinforcement. The steel has high strength, which can save construction steel and reduce the project cost.

Compared with hot-rolled round steel bars, cold-rolled ribbed steel bars can save 35% to 40% of steel when used in cast-in-place structures (especially in building roofs). If you consider not using hooks, the steel savings will be more. The original gauge of the steel bar is 5 times the diameter, but not less than 100mm.

According to the Revised Edition of the Highway Engineering Test Engineer's Manual, the original gauge distance of the model is proportional to the original cross-sectional area is called the proportional model, and the proportional model L. =k*√s。（l。

is the original gauge gauge, s. is the original cross-sectional area, s. for s.

open square (open square symbol cannot be played), k is constant). Internationally, K = the original gauge should not be less than 15mm. When the cross-sectional area of the model is too small to meet the minimum gauge spacing requirement by using the scale factor k, the higher value k= or the non-proportional gauge can be used for the gauge spacing.

When the steel pattern is a circular proportional type, the reinforcement l of (1) k=. = 5d, (2) k = of the reinforcement l. =10d。

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Do you have any other questions?

Summary. Hello, thank you for your patience and wait here for you to find d - represents the diameter of the reinforcement, 20d is 20 d. For example, d = 16 (mm), then 20d = 320 (mm).

Seismic formula: lle llae;

Non-seismic formula: ll lla.

The percentage of the area of the longitudinal reinforcement lap joint (%) is 25 50 100.

Before the reinforcement binding, carefully familiarize yourself with the drawings, check whether there are discrepancies between the batching list and the drawings and designs, carefully check whether the size of the finished product and the heart are consistent with the blanking table, and check that there is no error before binding.

When the diameter of the stressed steel bar of the beam is equal to or greater than 22, it is advisable to adopt a welded joint, and when it is less than 22, a binding joint can be adopted, and the lap length should comply with the provisions of the specification. The distance between the end of the lap length and the bend of the steel bar shall not be less than 10 times the diameter of the steel bar.

Rebar diameter 20

Hello, thank you for your patience and wait here for you to find d - represents the diameter of the reinforcement, 20d is 20 d. For example, d = 16 (mm), then 20d = 320 (mm). Seismic Formula:

lle＝ζllae；Non-seismic formula: ll lla. The percentage of the area of the lap joint of the longitudinal and vertical cover to the reinforcement (%) is 25 50 100.

Before the reinforcement binding, carefully familiarize yourself with the drawings, check whether there are discrepancies between the batching list and the drawings and the design, carefully check whether the size of the finished product and the heart are consistent with the blanking table, and check that there is no error before binding. When the diameter of the stressed steel bar of the beam is equal to or greater than 22, it is advisable to adopt a welded joint, and when it is less than 22, a binding joint can be adopted, and the lap length should comply with the provisions of the specification. The distance between the end of the lap length and the bend of the steel bar shall not be less than 10 times the diameter of the steel bar.

The light round steel bar is actually the small round steel and disc circle 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 steel bar is 8-50 mm, and the recommended diameter is mm.

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

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

I hope mine is helpful to you and I wish you a great life.

Answer: The ribbed steel bar is not the outer diameter, nor the inner diameter, but the nominal diameter.

Let's take a look at what it says in "Steel for Reinforced Concrete Part 2 Hot-rolled Ribbed Steel Bars":

Look at the nominal diameter of 40mm, the nominal cross-sectional area: 1257 mm.

Nominal diameter d, only nominal diameter d40, inner diameter d1 nominal size,.

According to the requirements only the inner diameter requirements, and negative tolerance requirements, in addition to meeting this condition, the weight of the steel bar meter must also meet the requirements.

The principle of replacing the diameter of 22 with a diameter of 20 reinforcement: equal strength substitution (you can only answer in principle).

In the specific operation of construction, the same strength substitution or equal cross-section substitution should be applied. To meet the provisions of the Code for the Design of Concrete Structures GB 50010-2010. "Code for Construction of Concrete Structure Engineering" GB50666-2011 echoes the mandatory provisions:

Strip. The implication is that the construction unit shall obtain the consent of the design in advance and handle the design change documents regardless of whether the same strength or the same cross-section replacement is used in the construction.

Code for the Design of Concrete Structures GB 50010-2010.

Code for Construction of Concrete Structure Engineering GB50666-2011 refers to Code for Design of Concrete Structure GB 50010-2010 and Code for Construction of Concrete Structure Engineering GB50666-2011.

Equal cross-section instead.

314·n1=380·n2

n1=380/314·n2

where the number of roots with a diameter of n2 is 22, and n1 is the number of roots with a diameter of 20.

The replacement of steel bars generally adopts the same strength substitution, that is, it is necessary to ensure that the overall strength of the replaced steel bar is not less than the strength of the original steel bar, and the specific replacement calculation method is:

1. For the same strength grade and model of steel bar, it can be replaced by the same area, assuming that the number of roots of the original 22 steel bar is n, then the number of roots of 20 steel bar is 22 * 22 (20 * 20), that is, the number is multiple and above of the original, and cannot be less than this number.

2. For the steel bar in the plate, if the horizontal spacing of the original 22 steel bars is 200mm, the horizontal spacing after using the steel bars of 20 is 200, that is, the spacing after replacement shall not be greater than 165mm.

2&22 (per rib) in a rebar drawing usually indicates the number and arrangement of reinforcing bars in a concrete beam or slab. The number 2 indicates two bars per rib, and the number 22 indicates that each bar has 22 spacing.

Specifically, each number on a rebar drawing typically represents a specific Kage rebar size and diameter, while "per rib" represents the number of these rebars distributed laterally along the concrete member. For example, in a concrete beam with a width of 3 meters, if the design requires 2 20 reinforcements per rib and 22 spacing per rib, then "2&22 (per rib)" will be marked on the reinforcement drawing to illustrate.

It should be noted that in the actual engineering design and construction, the number of steel bars and the layout mode need to be reasonably optimized and adjusted according to the specific structural requirements, load strip and safety and other factors to ensure the stability and bearing capacity of the structure.

When the nominal diameter of the ribbed steel bar is greater than 5 mm;

Answer: It is the first paragraph of the anchorage length correction factor of the longitudinal tension ordinary steel bar of the "Concrete Design Code" GB50010-2010 A should be used according to the following provisions:

1. When the nominal diameter of the ribbed steel bar is greater than 25mm;

The literal interpretation of this paragraph from this article stipulates that when calculating the anchorage length of longitudinal tension ordinary steel bar, when the diameter of the ribbed steel bar >25 mm, it should be multiplied by the coefficient.

In order to reflect the influence of the relative reduction of the relative rib height of the coarse-diameter ribbed steel bar on the reduction of the anchoring effect, the anchorage length of the coarse-diameter ribbed steel bar with a diameter greater than 25mm should be appropriately increased and multiplied by the correction factor.

1,1 is its correction factor, and the minimum lap is according to the atlas specification.

Multiply on the basis of the original lap length.