Construction method of high-precision integral pre-embedded large-diameter bolt group structure for raft foundation

Abstract

The invention relates to a raft plate basic high-precision overall pre-embedded large-diameter bolt group structure. The structure is characterized in that the structure comprises an upper-layer positioning plate, a lower-layer positioning plate, a bottom support seat, pre-embedded foundation bolts, connecting bolts, fine-adjustment bolts and leveling bolts; unit positioning steel plates are connected and assembled through node plates and the bolts to respectively form the upper- and lower-layer positioning plates, the pre-embedded foundation bolts are disposed between the upper- and lower-layer positioning plates, the pre-embedded foundation bolts and the upper-layer positioning plate are connected through the fine-adjustment bolts, the pre-embedded foundation bolts is in anchor connection with the lower-layer positioning plate; and the leveling bolts are disposed between the lower-layer positioning plate and the bottom support seat to perform connection, and the bottom support seat and a concrete cushion are connected through the pre-embedded bolts. The bolt group structure can perform three-dimensional dynamic adjustments on the pre-embedded bolts, ensures accuracy of center coordinates and scale heights of the bolts, achieves high-precision pre-embedment of a bolt group, and has a good economic technical benefit. The invention further provides a construction method for the raft plate basic high-precision overall pre-embedded large-diameter bolt group structure.

Description

Technical field [0001] The invention relates to a construction method for a high-precision integral pre-embedded large-diameter bolt group structure of a raft foundation. It belongs to the field of foundation treatment and is suitable for high-precision pre-buried installation construction of raft foundations of buildings. Background technique [0002] At present, the installation of power transmission substations, nuclear power plants, and various large-scale industrial equipment including steel structure workshops is increasing. Various foundations, especially the embedded bolts of equipment foundations, are widely used. Compared with traditional buildings, the embedded bolts of this type of building Bolts have large specifications, large quantities, and high installation accuracy requirements. Once individual bolts in the bolt group have large deviations, they will directly affect the normal installation and debugging of various equipment, and more likely affect future use. [...

AI Technical Summary

Problems solved by technology

The bolt direct burial method is to weld and fix the bolts and the steel bars of the foundation floor one by one, the construction operation rate is low, the bolt position cannot be adjusted after the welding is completed, the positioning accuracy is poor, and secondary deviations will occur during the concrete pouring process; the positioning formwork is pre-embedded The method is to fix the upper part of the bolt on the foundation formwork with square wood or positioning formwork, and the lower part is tied with steel bars and welded. This pre-embedded method consumes a lot of wood and formwork, and is not suitable for concrete structures with large structural dimensions and large structures. The pre-embedded structure of large-scale equipment; the steel bracket fixing method fixes the bolts on the steel bracket and pre-embeds together, and the embedded parts are fixed after the installation is completed. If there is a deviation, it cannot be corrected later; the equipment base is directly placed. First place the equipment base, Then install the bolts according to the bolt hole position of the equipment base, and then pour the concrete

For the overall pre-embedding of the bolt group of large-scale equipment, due to the large bottom area, the large number of bolts and the high requirements for bolt precision, the above-mentioned bolt pre-embedded construction methods are not suitable, which may easily cause accidents

[0004] In summary, the existing bolt pre-embedding methods have been difficult to meet the technical requirements for the overall pre-embedded construction of large-diameter bolt groups in raft foundations. Pre-embedded structure of large-diameter bolt groups with excellent benefits

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