Study on the relationship between bolt hole planning and quality of facility reserve

Due to the quality problems caused by the design, the investment efficiency of the equipment is reduced, which has become the primary problem of the basic quality of the equipment, and should be highly valued by the designers. The concept of islanding effect and the definition of islanding effect are the concepts proposed by the author for the local defects of concrete. The first is the bolt holes in the equipment foundation and the quality defects of the concrete. For example: concrete damage to the wall of the hole, insufficient or no strength of the concrete to be poured, and so on. These quality defects are a tiny part relative to the whole, and they are shaped like an island in the sea. The term of the island-shaped bolt hole defects is gradually emerging in the engineering community. The hazard is to weaken the connection between the equipment and the foundation, due to the island shape. Bolt hole defects make the equipment inoperable and have to be reinforced, resulting in significant losses. The island-shaped bolt hole defects in the equipment foundation are small, and may be a major defect with respect to the equipment, so the hazard must be highly valued. However, once there are island-shaped bolt hole defects, some equipment does not necessarily have quality problems immediately, which limits the degree of understanding of the hazards. This is because the location of the island-shaped bolt hole defects is different, and the degree of damage of the equipment is different. Therefore, the existence of the island-shaped bolt hole defect is not only discovered at the time, but also exposed during use, or it is not found for a long time. It is reasonable to use the island effect.

The islanding effect can be defined as follows: when the following conditions occur, the reserved bolt holes are misplaced or missing, and the bolt-injecting body has insufficient pull-out resistance due to improper boring; the bolt hole-filling material has no strength or strength; the bolt hole-filling material is generated. Shrinkage, so that it can not form a reliable overall work with the surrounding concrete; the bolt hole infusion material forms a void or imperfection in the hole; the bolt hole wall shear damage; the improper pouring method deflects the bolt. These conditions weaken the connection between the equipment base and the equipment, jeopardizing the reliability of the equipment operation, called the island effect. The hazard of the island effect can be dominant or implicit. Once the anchor hole is reserved, the static force of the equipment is mainly redistributed by the internal force, and the power of the equipment is shared by the bolts other than the islanding effect, which is extremely disadvantageous. The islanding effect is actually broad, and it also includes the unevenness of concrete materials and the development of cracks, and the quality formed is degraded. This article only describes the islanding effect caused by improper design of the bolt holes.

The design of the reserved bolt hole must obtain the information of the equipment and check with the processing hole of the equipment base. With the development of modern technology, the functions and materials of various equipments are improving faster, especially imported equipment, large equipment and special equipment. Equipment, almost every type of equipment has different levels of design improvements, often involving changes in the outline and base. Therefore, the information provided by the manufacturer to the user at the time of signing may be the information of the previous device. The general solution is that the manufacturer will then deliver the latest equipment information that has been put into production after signing the contract; or the manufacturer will sign the approval after the basic design of the equipment is completed. However, before the installation of the equipment foundation, it was found that the reserved bolt holes of the equipment foundation were inconsistent with the hole of the equipment base, and there were three main reasons.

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