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original title: High-precision anchor bolt pre-embedded construction method 1. High-precision anchor bolt pre-embedded construction method, which is characterized by including the following steps: (a) Construction preparation: Organize and dispatch construction personnel, construction machinery, equipment and materials according to the construction organization design, do preliminary construction preparations, complete construction procedures, and ensure that construction starts smoothly as planned; (b) Establish a control network: Set out and position the lines at the construction site, select control points around them, establish a 40m measurement control grid, take closed measurements in both forward and reverse directions, and set up two horizontal and vertical control boundaries at the corners of the building to carry out reinforcement measures; High-precision anchor bolt pre-embedded construction method (c) Production of positioning fixtures and positioning control panels: Use a 15mm thick rigid frame to be processed and formed according to the design size. The joints are fully welded and smoothed. The bolt hole locations are drawn and the bolt holes are drilled. The diameter of the bolt holes is 1mm larger than the diameter of the anchor bolts to make a positioning fixture. After the positioning fixture is made qualified, 20_For a thick wooden formwork, use the positioning fixture as the master, place the positioning fixture above the wooden formwork, and clamp it with a mechanical clamp. The drilling machine will drill holes in the wooden formwork according to the positioning holes on the positioning fixture to complete the production of the positioning control board; (d) Pre-embedding the basic steel bars: Concrete is poured first to form a concrete cushion, and then the foundation steel bars are inserted into the cushion along the direction of the vertical pre-embedded anchor bolts, and then Φ12 horizontal steel bars are welded to the foundation steel bars, and then column foot formwork is set on the concrete cushion, and finally the foundation steel bars are tied and formed on the spot with 8# lead wire; (e) Positioning fixture installation: First, set up an independent bracket on the concrete cushion, use a level gauge to measure the level points on the bracket, and use fasteners to set up a triangular support steel pipe frame based on the level points. After the support steel pipe frame is erected, install the positioning fixture according to the measured elevation and plane positioning axis, and install it on the supporting steel pipe frame. Then fine-tune the plane position of the positioning fixture. After the adjustment is completed, review the elevation and horizontal axis displacement of the positioning fixture, and then add a concrete column formwork; (f) Installation of anchor bolts: Use a crane to vertically pass a single anchor bolt through the anchor bolt holes at the four corners of the top surface of the steel frame corresponding to the concrete column formwork. The screw rod passes through the corresponding positioning hole on the positioning fixture. After it is vertical, screw the upper part of the anchor bolt into the nut, and insert the positioning control plate into the anchor bolt. The positioning control plate is close to the upper surface of the nut, and at least 4 square logs are set between the positioning control plate and the steel frame. The square logs are connected to the steel frame, and then the Screw the nut into the upper part of the anchor bolt, screw the nut to the surface of the positioning control panel, and then use a wrench on the nut to adjust the elevation of the anchor bolt. After the adjustment of the top elevation of the anchor bolt is completed, you can use a hydrometer to measure the anchor bolt. To adjust the verticality, use an electric welder to connect and weld the anchor bolts to each other one by one with Φ12 steel bars. Finally, fully weld and fix the pre-embedded anchor bolt group with Φ12 steel bar heads and the reserved steel bars in the cushion; (g) Reinforcement and protection of anchor bolts: There is a clamping hole on the anchor bolt positioning fixture. According to the position of the anchor bolt, an elastic clamp is set on the outside of the anchor bolt, and the legs on the elastic clamp are inserted into the clamping hole. The spring clamp is engaged on the anchor bolt positioning clamp to further strengthen the anchor bolt. Then apply a layer of butter on the anchor bolt rod, wrap it with plastic paper, and then cut the PVC pipe into 300mm long and put it on the anchor bolt rod for protection; (h) Concrete Rao Construction: Carry out one-time concrete pouring for the installed pre-embedded anchor bolt foundation. Before the initial setting of the concrete, use the column center positioning cross and the level to check the horizontal position, elevation, embedded bolt spacing and verticality of the anchor bolts; (i) Remove the fixture; (j) Acceptance and handover to complete the embedded construction: Mark the axis and elevation on the side of the concrete, then inspect and accept the anchor bolts, then fill in the inspection batch acceptance information and handover records, and finally complete the construction.