According to GB/T 799-1988 anchor bolt device standard: M6, M8, M10, M12, M16, M20, M24, M30, M36, M42, M48M, length from 80 to 1500. The number of anchor bolts of the equipment is selected according to the anchor bolt device grid of JB/T 4710-2005, and the bolt selection of the equipment flange is slightly different from the selection of anchor bolts in the same bolt area: small diameter and large diameter bolts are selected, first The consideration is the convenience of on-site installation.
Anchor bolt: When the mechanical component is installed on the concrete foundation, the bolt is J-shaped, and the L-shaped end is embedded in the concrete for use. The tensile strength of the anchor bolt is the tensile strength of the round steel itself. The size is equal to the cross-sectional area multiplied by the allowable stress. Bonded anchor is a common anchor bolt in recent years. Its methods and requirements are the same as those of expansion anchors. However, when bonding, be careful to blow away the debris in the hole and do not get wet. Operation process: 1. One-time burying method: When pouring concrete, the anchor bolts should be embedded. When the tower is overturned, the anchor bolts should be embedded once. The anchor bolts are generally made of Q235 steel, which is round. Rebar (Q345) has high strength and is not easy to make nut fasteners smooth. Regarding flat anchor bolts, the depth is usually 25 times the bolt diameter, and then a 90-degree hook with a length of about 120 mm is made. If the bolt diameter (such as 45mm) is too deep, the bolt can be welded to the end of the plate, that is, make a big head (but it is also required). To ensure the friction between the anchor rod and the foundation, the buried depth and hook are designed to avoid pulling out the bolt. There is a risk to install anchor bolts. When opening the weld seam, the tower crane often comes down, so let's do it according to the standard. "The bottom of the anchor bolt adopts a crochet type. In order to ensure accuracy, the embedded measurement and oscillation pay attention to the use of tension fixation, and the test after oscillation is generally no problem. In addition, there must be stress after welding, which will also cause the bolt to simply crack. If it is Welding words.
The length of the exposed part on the ground is determined by the foot thickness of the equipment. The length of the embedded concrete should be determined according to the force. When the size of the force cannot be determined, the length of the embedded concrete should be determined as: anchor bolt diameter ≈×20. 1. Steel structure anchor bolt standard Q235B, steel stud bolts cannot use shear and shear load-bearing keys. 2. It is composed of Q digital quality level symbols and deoxygenation method symbols. The steel number of steel is "Q", which represents the yield point of steel, the latter represents the yield point, the unit is Q 235, and the yield point (σs) is 235 MPa. If necessary, the symbol indicating the quality level and deoxidation method can be marked after the steel number. The symbols of quality grade are A, B, C, D. The symbol of the deoxidizing method is: F stands for boiling steel; b stands for semi-rolled steel; Z stands for high-strength steel; TZ stands for special high-strength steel, and steel-containing cannot be signed, that is, Z and TZ have no signs. For example, Q 235-AF stands for A-grade boiling steel. Generally, the pre-embedded with high device accuracy should be made into a cage (it is required to pass through the bolt hole on the pre-embedded steel plate, and then tighten it with a nut." Fix the insert on the template before to ensure the size of the bolt device. If you want to save data, you can also use steel welding to fix it. After welding, you need to check the geometric size. At this point, the anchor bolt device is truly complete. First of all, the materials of the anchor bolts meet the requirements, and the welding method is not allowed to be used in the relative position of the fixing bolts, because the bolts are made of materials with higher carbon content, and the welding at room temperature will simply cause cracks and the bolts will be broken; it should be locked. Flat washers and nuts. The thread on the upper part of the nut is not less than 3 teeth; when the verticality is adjusted by the washers, the washers shall not accumulate more than 3 pieces.