Precautions for installation of foundation bolts

The precautions for installing anchor bolts need to be controlled from multiple aspects such as pre installation preparation, installation process control, and post installation inspection. The following are specific instructions:

1、 Preparation before installation

Material Inspection

Specification verification: Check whether the specifications, models, lengths, and other parameters of the anchor bolts are consistent with the design drawings to avoid installation failure or unstable equipment operation caused by the use of incorrect specifications. For example, if the device requires the use of M24 bolts but actually uses M20 bolts, it cannot meet the strength requirements for fixing the device.

Quality inspection: Carefully inspect the surface of the bolt for defects such as cracks, rust, deformation, etc., and also check whether the nut and gasket are compatible and of qualified quality. If severe corrosion is found on the surface of the bolt, it may affect its bonding strength with the concrete and reduce the fixing effect.

Anti corrosion (based on actual reports) (based on actual reports) treatment: For anchor bolts used in humid or corrosive environments, anti-corrosion (based on actual reports) treatment should be carried out in advance, such as galvanizing, coating with anti rust paint, etc., to extend their service life.

Preparation of tools and equipment

Tool inspection: Confirm that the tools required for installation, such as wrenches, drills, level gauges, theodolites, etc., have good performance, accuracy, and excellence. For example, the accuracy of the level directly affects the verticality of the anchor bolts. If the level is not accurate, it may cause the bolt installation to tilt.

Equipment debugging: If using large equipment such as cranes for lifting and installing anchor bolts, it is necessary to debug and inspect the equipment in advance to confirm its normal operation and excellent safety device effect.

Technical briefing and personnel training

Technical briefing: Organize construction personnel to conduct technical briefings to familiarize them with construction drawings, installation processes, and quality requirements. For example, clearly inform the construction personnel of key parameters such as the burial scale of anchor bolts and the allowable range of verticality deviation.

Anran Training: Provide Anran training to construction personnel, emphasizing safety precautions during installation, such as correctly wearing personal protective equipment and complying with safety regulations for high-altitude operations.

2、 Installation process control

Positioning and laying out

Benchmark determination: Based on the construction drawings and the actual situation on site, accurately determine the benchmark points and axes of the equipment foundation, and use measuring instruments such as theodolites and level gauges to measure them on the equipment foundation, and mark them properly.

Position setting out: Use tools such as steel rulers and ink pens to set out the position lines of the anchor bolts on the equipment foundation. The error of the position lines should be controlled within the specified range, generally not exceeding ± 2mm. During the setting out process, attention should be paid to avoiding cross interference and confirming the accurate position of each bolt.

Bolt-on

Fixed frame production and installation: The fixed frame should have sufficient strength and rigidity to protect the anchor bolts from displacement and deformation during the concrete pouring process. The material of the fixed frame is generally steel, such as angle steel, channel steel, etc., and its size and shape should be designed according to the actual situation. When installing the fixed frame, bolts or welding should be used to firmly fix it, and a level and theodolite should be used to level and adjust the fixed frame, confirming that its levelness and verticality meet the requirements.

Bolt installation and adjustment: Insert the anchor bolts into the reserved holes of the fixed frame according to the design position, and use nuts and washers to preliminarily fix them. Adjust the verticality and elevation of the anchor bolts using a level and steel ruler, with a verticality deviation not exceeding 1/100 of the bolt length and an elevation deviation not exceeding ± 5mm. After adjustment, weld the anchor bolts firmly to the fixing frame to prevent displacement during concrete pouring.

Concreting

Layered pouring: Concrete should be poured in layers, with each layer not exceeding 300mm in thickness, and compacted using a vibrator to confirm the compactness of the concrete. Layered pouring can avoid the occurrence of voids and bubbles inside the concrete, and improve the strength and performance stability of the concrete.

Bolt protection: During the concrete pouring process, attention should be paid to protecting the anchor bolts to avoid collision and displacement. Plastic film or wooden boards can be used to cover and protect the anchor bolts to prevent concrete from splashing onto them and affecting their use.