Anchor screw fixing plate 20 q235 a

How to do a good screw and nut factory, fastener consultant Yu Wenlong believes that the screw and nut factory wants to do a good job, one is to locate a good customer, position a good product, the same is to do screws and nuts, due to different customer positioning, different product objects, the same screws and nuts, sales ** difference several times; Yu Wenlong, a fastener consultant, believes that the second is to do a good job in sales, as long as the boss knows how to divide profits, there will be a large number of talents to join, there are talents to sell, and these talents are based on the business to share profits, the boss basically does not need any investment in the early stage; Yu Wenlong, a fastener consultant, believes that the third is to save costs, and the cost savings are mainly to reduce procurement costs, reduce sales costs, and reduce production costs. Fourth, hire fastener consultants, fastener consultants have a large number of first-class business lists, customer lists, understand fastener-related technology, quality assurance, quality inspection, procurement, business, understand which customers are the most profitable, can greatly improve the sales unit price, increase customers, reduce procurement costs, and obtain the company's maximum benefits and maximum development.

Yu Wenlong, a fastener consultant, believes that it is best to check the relevant information by yourself, and it is always fake on the Internet. Of course, fastener consultant Yu Wenlong believes that if you have the strength, it is also a good choice to ask a fastener consultant to refer to your technology, grasp the direction of enterprise development, position products, and position customers. Yu Wenlong, a fastener consultant, has been engaged in the fastener industry for more than 10 years, and has been engaged in technology, quality inspection, quality assurance, procurement, business, etc. in the fastener industry, and has accumulated rich industry experience, and has accumulated a large number of technical information, customer information, and supplier information.

Yu Wenlong, a fastener consultant, provides paid consulting services, provides standard consulting, customer positioning, product positioning consulting, supplier information, business development method consulting, and provides paid consulting and consulting services for all related matters in the screw industry.

What companies need to order a large number of screws, nuts, non-standard parts customization, fastener consultant Yu Wenlong believes that a large number of screws, nuts, non-standard parts of the company many, many fastener companies have sold more than 100 million, net profits of tens of millions, a single contract from tens of yuan to tens of millions of yuan, fastener consultant Yu Wenlong has seen the largest single contract of domestic fasteners is a contract amount of 18 million yuan. Fastener consultant Yu Wenlong believes that the total consumption of screws, nuts and non-standard parts is huge, and the total domestic demand and foreign trade demand is hundreds of billions of dollars a year, but these dosages do not belong to you, so it depends on your customer positioning, product positioning, product quality, service quality, product quality, and marketing methods. Fastener consultant Yu Wenlong believes that the smallest domestic fastener company has annual sales of hundreds of thousands, the largest fastener company has annual sales of hundreds of billions, how many domestic enterprises have millions of annual purchases, how many enterprises have tens of millions of buyers every year, fastener consultant Yu Wenlong believes that the key is not to see how many orders the purchasing company needs, the key is to see if you can win, otherwise the largest amount of purchases, you can only swallow saliva.

It is necessary to fix the plate with anchor bolts.

The thickness of the representative steel plate is 28 mm, the length is 1036 mm, and the width is 204 mm.

Also, all countries have different specifications and standards, such as the British system, the legal system, the German system, the Australian standard, and the American standard.

1. The verticality of the anchor bolts, the anchor bolts should be installed vertically without inclination.

2. The laying of anchor bolts, in the process of anchor bolt installation, is often encountered is the secondary grouting of dead anchor bolts, that is, when pouring the foundation, leave the reserved holes of anchor bolts on the foundation in advance, wear anchor bolts when installing equipment, and then use concrete or cement mortar to water the anchor bolts to death.

3. Anchor bolt installation - tightening.

4. Make construction records of the corresponding anchor bolt installation.

The installation of anchor bolts is generally divided into 4 processes.

One. Anchor bolt verticality.

The anchor bolts should be installed vertically and without inclination.

Two. Laying of anchor bolts.

In the process of anchor bolt installation, what is often encountered is the secondary grouting of dead anchor bolts, that is, when pouring the foundation, leave the reserved hole of the anchor bolt on the foundation in advance, wear the anchor bolt when installing the equipment, and then use concrete or cement mortar to water the anchor bolt to death.

Three. Anchor bolt installation – tightened.

Four. Do a good job of the construction record of the corresponding anchor bolt installation.

In the process of installing anchor bolts, the corresponding construction records should be made in detail, and the models and specifications of anchor bolts should be truly reflected, so as to provide effective technical information for future maintenance and replacement.

Generally, the embedded with high installation accuracy must be made into a ground cage first (it needs to be worn on the embedded steel plate with bolt holes first, and the nut is installed and pressed. Before pouring, the embedded parts are tied to the template and fixed, so that the installation size of the foot bolts can be guaranteed. If you want to save materials, you can also use steel bar welding to fix, and the geometric dimensions need to be calibrated after the welding is completed.

At this point, the installation of the foot bolts is truly completed.

The principle is very simple, which side of the column is poured, indicating which side of the anchor nut (the adjusting nut under the bottom plate of the column) is low, and the corresponding one can be tightened up. The specific operation is like this: generally the axis direction and vertical direction of the column are adjusted twice, and the theodolite is used to check which side the column is poured (poured more, and the naked eye can also see that there is no theodolite, you can also use a hanging wire hammer, preferably a magnetic line hammer, which can be glued to the steel column), determine which side is low, loosen the compression nut on the bottom plate on the side, don't loosen too much, and then slowly tighten the adjustment nut under the bottom plate, pay attention to the change of the verticality of the column while tightening, and tighten the two side by side at the same time. You can tighten it a little bit and then press the nut on top and the post will come back, and that's just right.

Generally speaking, there will be 4 or 6, 8 anchor bolts in the column base, or even more, 4 is the best adjustment, with the above method, two 90-degree directions can be adjusted in place. If it is 6, or 8 or more, when adjusting, loosen all the upper nuts that exceed the center line of the column, and then start adjusting from the outermost adjustment nut, and when it is in place, then put the middle top up.

In short, the operation is stronger than the theory, and it is easy to try it yourself. Remember to bring an open-end wrench (for adjusting the nut underneath), a hammer (sometimes there is not enough space to pull it, use a hammer to knock it slowly), a torx wrench (tighten the nut above), and prepare a crowbar if possible, sometimes the low side is a little up, and you can quickly turn the nut with your hands.

Generally, in non-cold and severe cold areas, Q235B bolts can replace Q235C bolts.

According to the GB T700-2006 standard of "Carbon Structural Steel", the chemical composition and mechanical properties of Q235B and Q235C are basically the same.

Feature 1: The material has high strength and light weight.

Steel has high strength and high modulus of elasticity. Compared with concrete and wood, the ratio of its density to yield strength is relatively low, so the component section of the steel structure is small under the same stress conditions, the self-weight is light, it is convenient for transportation and installation, and it is suitable for the structure with large span, high height and heavy load.

2. The toughness and plasticity of the steel are good, the material is uniform, and the structural reliability is high.

It is suitable for bearing impact and dynamic loads, and has good seismic performance. The internal structure of the steel is uniform, which is close to the isotropic homogeneous body. The actual working performance of the steel structure is more in line with the calculation theory. Therefore, the steel structure has high reliability.

3. The degree of mechanization of steel structure manufacturing and installation is high.

The steel structure components are easy to manufacture in the factory and assemble on the construction site. The mechanized manufacturing of steel structure components in the factory has high precision, high production efficiency, fast assembly speed and short construction period. Steel structure is one of the most industrialized structures.

4. The sealing performance of the steel structure is good.

Because the welded structure can be completely sealed, it can be made into high-pressure vessels, large oil pools, pressure pipelines, etc., which have good air tightness and water tightness.

5. The steel structure is heat-resistant or fire-resistant.

When the temperature is below 150, the properties of the steel change very little. Therefore, the steel structure is suitable for the hot workshop, but when the surface of the structure is exposed to about 150 heat radiation, it is necessary to use a heat insulation board to protect it. The temperature is 300 -400 °C.

The strength and elastic modulus of the steel are significantly reduced, and the strength of the steel tends to zero at a temperature of about 600. In buildings with special fire protection needs, the steel structure must be protected with refractory materials to improve the fire resistance level.

6. The corrosion resistance of the steel structure is poor.

Especially in the environment of humid and corrosive media, it is easy to rust. Generally, the steel structure should be derusted, galvanized or painted, and it should be maintained regularly. For offshore platform structures in seawater, special measures such as "zinc block anode protection" are required to prevent corrosion.

7. Low carbon, energy saving, green and environmental protection, reusable.

The demolition of steel structure buildings will hardly produce construction waste, and steel can be reused.

First, the general anchor bolt is made of Q235 steel, that is, it is light and round. Rebar (Q345) has high strength and is made of screws.

The thread buckle of the mother does not have a smooth round capacitance.

Easy. Second, a brief introduction of anchor bolts:

When the mechanical component is installed on the concrete foundation, the J-shaped, L-shaped end of the bolt is buried in the concrete for use.

The tensile capacity of the anchor bolt is the tensile capacity of the round steel itself, and the size is equal to the cross-sectional area multiplied by the allowable stress value (Q235B: 140MPa, 16Mn or Q345: 170MPa) is the allowable tensile bearing capacity during design.

3. Illustration:

1.Anchor bolt material selection.

Generally speaking, the anchor bolt material is best Q235, when the strength is not enough, you can choose 16mn after calculation Q235 is generally used, and the bolts are tensile and pull-resistant.

According to the actual situation, anchor bolts no longer play a big role after the installation of the steel structure. There is only a part of the shear force, because after the installation is completed, the main role is the support, so when selecting anchor bolts, we must refer to the specification. In fact, we generally only use Q235B or Q235A, and generally do not use Q345, and the hook length is not less than 150mm

Anchor bolts: can be divided into equipment anchor bolts and structural anchor bolts, the selection of anchor bolts should be considered from the perspective of force, that is, as a fixed support bolt to bear the shear, tension, torsion, at the same time as the anchor bolt should be mainly subjected to shear force, so in most cases choose Q235 (while considering the ambient temperature, to avoid the occurrence of "blue brittle"). When the building, structure or equipment fixed by anchor bolts has obvious tension or torsion on the anchor bolts, the former needs to be calculated to select the diameter or directly select 16mn with higher tensile strength, and the latter is recommended to increase the number of anchor bolts to solve, after all, the material is very expensive now.

It is best to use Q235A, Q235B is more expensive than Q235A, and the anchor bolts do not need to be welded, so it is okay to use grade A.

2.Anchor bolt material processing technology.

Anchor bolt processing technology: first threaded, then bent hook, and a horizontal tree of the same material near the hook is 150mm long

In addition, it should be noted that A3 is an old brand, and now it corresponds to Q235A A3 steel is the name of the past, although it is still used, but it is limited to spoken language, it is best not to use it in written documents, it is Class A steel, this kind of steel manufacturer only guarantees mechanical properties and not chemical composition when leaving the factory, so impurities such as S, P may be a little more, and its carbon content is about the same, roughly equivalent to No. 20 steel, and the new standard Q235 is equivalent. A3 and A3F are both used to be called Q235-A, ;

Q235 is carbon structural steel, which is compared with the old standard GB700-79 grade A3 and C3

Q345 is a low-alloy structural steel, compared with the old standard 1591-88 grade 12mnv, 16mn 16mnre, 18nb, 14mnnb

As for the performance and application, there are too many, Q235 - metal structural parts, carburized or cyanide parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and weldments.

Q345 - good comprehensive mechanical properties, low temperature performance is also acceptable, good plasticity and weldability, used as medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load structures, mechanical parts, building structures, general metal structural parts, hot rolled or normalized state of use, can be used in a variety of structures in cold areas below -40.

Generally, it refers to the connecting bolts between the steel column or equipment base and the concrete foundation, which are pre-buried during the construction of pouring concrete, and are also poured after the reserved hole.

It is a bolt that is connected to the ground or a cement foundation, and the kind that is buried in the ground.