How to distinguish the upper groove and the lower groove of ribbed steel bar?

How to distinguish ribbed steel bars from facing up and down? Well, if you look up and down, you have to look at his lines, and the lines are screwed in the clockwise direction to the clockwise.

The difference between a light round steel bar and a ribbed steel bar is mainly whether there is a rib on the surface, which can be a longitudinal force or a transverse rib, if it is a steel bar with two longitudinal forces or a transverse rib that is evenly distributed along the length.

If you want to distinguish between the upper layer and the lower groove, their size is different from one of their messages, and you need to observe it yourself to see it.

Tear steel bars can distinguish the upper and lower length and height.

If you want to better facilitate the entry and exit of such a kongjing, you must observe its main features and orientation in order to be better. Discern.

Bring the piano how to distinguish a little bit and then you can look at his kind of range, and then as long as it is large, this should be able to better carry out some practical.

This can be convenient for both the upper and lower heads, and the specific painting is carried out according to the actual rules.

How to distinguish the ribbed steel bar, the upper and lower heads, the head has a cow smell and twist.

How to distinguish the upper groove and the lower grass of ribbed steel bar, there are specific standards for this to see the steel bar**.

If you want to distinguish between the upper and lower grooves, you can ask a professional.

The way to tell is very simple, you can tell by his appearance.

1. Hot drawn disc rods and hot drawn straight strips are directly measured with vernier calipers, and direct readings can be done.

2. When the hot tie ribbed steel bar is measured with vernier caliper, one end of the caliper should be stuck on the rib and one end should be stuck on the smooth surface under the rib. If both ends are stuck in the ribs or on the smooth surface under the ribs, it is not right.

1. Circular. It is also called a stall pin to dress up the wire rod.

Also called wire, the shape is a whole plate, the surface is smooth, and there are only two ends in a bundle.

2. Thread, Tianjin Tiantaicheng, the thread surface is a spiral strip-shaped steel bar;

3. There are three kinds of ribbed steel bars on the surface, one is threaded, one is herringbone, and one is crescent-shaped. Whether it is a disc or a thread or a ribbed steel bar, it belongs to the bucket and the steel bar.

Commonly used steel bars, the drawings mark HPB300 (the original specification HPB235) as light round steel bars, other HPB335, HRB400, HRB500 are ribbed steel bars, the marking symbols see the structural description, you can also view the relevant chapters of the "Reinforced Concrete Design Code".

The previous 3 refers to a yield strength of 335

Ribbed steel bars are steel bars that have protrusions on top of them. As shown below:

In addition to the first-class round steel, the steel bars above the second level are ribbed, which is the protrusion on the surface of the steel bar, which plays the role of increasing friction resistance and concrete grip and wrapping force.

Rebar is a common name for hot-rolled ribbed steel bars. It is divided into two categories: ordinary hot-rolled steel bars and fine-grained hot-rolled steel bars.

Cold-rolled ribbed steel bar is a kind of steel bar with a two-sided or three-sided crescent shape formed by using hot-rolled wire rod to reduce the diameter of multiple cold-rolled ribs, pressing ribs and eliminating internal stress. Cold-rolled ribbed steel bar in the prestressed concrete member, is the replacement product of cold-drawn low-carbon steel wire, in the cast-in-place concrete structure, then can replace the grade steel bar, to save steel, is a better one of the same kind of cold-worked steel.

[Cold-tied ribbed steel bar].

Cold-rolled ribbed steel bar is a kind of construction steel newly developed at the end of the seventies in the world, it is an ordinary low-carbon hot-rolled disc rod as raw material, through cold-rolled diameter rolling ribs, rolled into a deformed section steel bar with transverse ribs on three sides, with high strength, good plasticity, strong grip and wrapping force between concrete, used in concrete components, not only can save steel, cement, but also fundamentally improve some quality problems caused by poor bonding and anchoring performance of light round cold dialed low-carbon steel wire, and improve the safety and reliability of concrete components.

Cold-drawn ribbed steel bars are substitute materials for cold drawn wire and class I steel bars, which are widely used. The first is to improve the quality of the project; second, it has the effect of saving steel and cement; The third is to reduce the project cost of 10 12 yuan per square meter, which is a kind of high-efficiency and energy-saving steel.

The steel bars commonly used in construction can be roughly divided into round and ribbed, (in addition to cold-rolled buttons). It is distinguished by appearance. Ribbed steel bars are further divided into hot-rolled ribbed steel bars and cold-rolled ribbed steel bars, which are distinguished from the processing technology.

If you're not a professional researcher, knowing these is enough.

Simply put, it is a threaded steel bar.

In appearance, as long as it is not light, it is ribbed.

The difference between the reinforced concrete beamless type and the beamed type of the strip foundation is whether there is a beam reinforcement in it, and the reinforcement without beams in the strip foundation is the beamless strip foundation.

If h1=0, it is a strip-shaped foundation without ribs, if h1 is not equal to 0, and the ratio of rib height to rib width h1:a 4:1 is a belt-shaped foundation (the rib height of the strip base in the figure is h1, and the rib width is a), the volume of the rib is combined with the foundation to calculate, and the ribbed strip foundation quota project is executed; When h1:

A>4:1, the volume of the rib above the foundation expansion surface is calculated according to the reinforced concrete wall, and the volume below the expansion surface is calculated according to the plate foundation.

Looking directly at the construction drawings, it is not clear what you are referring to.

Cold-rolled ribbed steel bar is made of ordinary wire rod through cold rolling extrusion into ribbed steel bar, the diameter is generally 5mm, commonly known as small thread, mainly used for various cast-in-place plates, the strength is much higher than that of first-class steel.

CRB550 cold-rolled ribbed steel bar The executive standard JGJ95-2003 is a steel bar with ordinary low-carbon steel, high-quality carbon steel or low-alloy steel hot-rolled rod as the base metal, and cold-rolled on its surface after cold-rolled diameter reduction.

To put it simply, it is a threaded steel bar.