Pole Screws

Pole Screws

Anchor bolts and Foundation bolts are screws used to fasten the equipment on the concrete foundation. Generally used in railways, highways, power enterprises, factories, mines, Bridges, tower cranes, longspan steel structures and large buildings and other infrastructure. Have a strong stability.

Anchor bolts generally use Q235, Q345, that is, light round. Rebar for the foundation use very little, but if the force required is fine. Screw steel (Q345) strength, do nut thread buckle no light round easy. For the optical anchor bolt, the burial depth is generally 25 times its diameter, and then make a 90-degree bending hook about 120mm long. If the bolt diameter is very large (such as 45mm) buried too deep, you can weld the square plate at the end of the bolt, that is, do a big head can be (but there are certain requirements). The buried depth and bent hook are to ensure the friction between the bolt and the foundation, so that the bolt will not be pulled out. Therefore, the tensile capacity of the anchor bolt is the tensile capacity of the round steel itself, the size is equal to the section area multiplied by the tensile strength design value (140MPa) is the allowable tensile capacity of the design. The ultimate tensile strength is multiplied by the section area (this should be the effective area at the thread) by the tensile strength of the steel (Q235 tensile strength is 235MPa). As the design value is biased towards safety, so the design tensile force is less than the ultimate tensile force.

Installation process

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

I. Perpendicularity of anchor bolt

Anchor bolts should be installed vertically without tilt.

Ii. Laying of anchor bolts

During the installation of anchor bolts, it is often encountered that the second grouting of the anchor bolts is performed. That is, when watering the foundation, the reserved holes of anchor bolts are set aside in advance on the foundation. When installing the equipment, the anchor bolts are put on, and then the anchor bolts are watered with concrete or cement mortar.

Iii. Anchor bolt installation - tightening

4. Make construction records of corresponding anchor bolt installation

During the installation of the anchor bolt, the corresponding construction records should be made in detail to truly reflect the type and specification of the anchor bolt, so as to provide effective technical data for future maintenance and replacement.

Generally, the embedded steel plate with higher installation accuracy should be made into the ground cage first (it needs to be worn on the embedded steel plate through the bolt hole, and installed with nuts to press tightly. Before pouring, the embedded parts are bound and fixed on the template to ensure the installation size of the foot bolts. If you want to save material, you can also use steel welding fixed, after the completion of welding need to check the geometric size. At this point, the foot bolt installation is really complete.

Type, standard

Hexagon head bolts GB/T5782-2000 cross recessed pan head tapping screws GB845-85

Hexagon socket head screws GB/T70.1-2000 square head bolts Class C GB8-88

Standard spring washer GB93-87 Cross recessed countersunk head Tapping screws GB846-85

Hexagon bolts, all thread GB/T5783-2000 Hexagon nuts - Class C GB/T41-2000

Square Nuts - Class C GB39-88 slotted cylindrical head Screws GB/T65-2000

Butterfly nuts GB62-88 Hexagon socket countersunk head screws GB/T70.3-2000

Screw GB/T15389-94 Anchor bolt GB799-88

Hexagon socket flat round head screws GB/T70.2-2000 semi-round head square neck bolts GB12-88

Hexagon socket setting screws with flat end GB/T77-2000 cross recessed pan head screws GB/T818-2000

Hexagon thick nuts GB56-88 cross recessed pan Head Self-drilling Self-tapping Screws GB/T15856.1-2002

Round nut GB812-88 Hexagon head Tapping Screws GB5285-85

Slotted countersunk head screws GB/T68-2000 Hexagon flange face bolts small series GB/T16674-1996

Hexagon flange face bolts - Extended Series - Class B GB5789-86 Plain washers Class C GB/T95-2002

Cover nut GB923-88 slotted Pan Head Tapping Screws GB5282-85

Wall panel tapping screws GB/T14210-93 cross slot semi-countersunk head tapping screws GB847-85 In addition, there are too many kinds of screw specifications, there are thousands of national standards included, you can see the relevant national standards.

Other standards

Moreover, different countries have different specifications and standards, such as British, legal, German, Australian and American standards.

Ordinary carbon steel: Q195,Q215, Q235, Q255, Q275, A3, SS400, Q345B, 10B21,

High quality Carbon steel: ML15AL,20# Steel, 35# Steel, 45# Steel, 65Mn, 08F,

Alloy steel: 40Cr,40CrMo, 30CrMo, 35CrMo, 42CrMo, 20MnB, 20CrMnTi, 25Cr2MoV,

Fastener grades are 4.8, 6.8, 8.8, 10.9, 12.9, fine teeth, back teeth bolts.

Another stainless steel 201,304,316,316 L, nylon bolts, etc.

Product standards: GB, HG, JB, SH, DIN, ANSI, BS, JIS, ISO and non-standard fasteners customized according to customer requirements.

External can provide customized processing of various large extended high strength bolts, all kinds of non-standard non-standard fastener bolts, nuts, can provide white zinc plating, color zinc, hot dip zinc, dacro, hot dip zinc, powder zinc plating, nickel plating, chrome plating, multi-alloy co-penetration, sealing treatment, oxidation and other surface treatment, to meet the needs of different customers.

Our products are widely used and we are committed to serving the following industries:

1. Transportation (highways, subways, Bridges, tunnels, etc.)

2. High-rise steel structure: Hangxiao steel structure, seiko steel structure, Dongguan Laigang steel structure.

3, equipment installation industry (petroleum, chemical and other large machinery and equipment).

4. Electric power industry (thermal power station, nuclear power plant, thermal power plant, chemical aluminum plant, transmission tower, etc.)

5. Equipment Manufacturing Industry (elevator, shipbuilding, water pump, etc.)