I. Technical Specifications for Foundation Cleaning and Dimensional Verification Old Foundation Pretreatment Process The cleaning of the original anchoring groove adopts the combined process of "mechanical crushing + manual chiseling": first, hydraulic hammers are used to break the wedge blocks, then pneumatic picks are used to chisel off the loose concrete in the groove, and finally the roughness of the groove wall is made to reach 50-80mm; The sludge cleaning on the foundation plane must meet the standard of "exposing the original color of cement". Vacuum suction machines are used to remove sludge particles with a particle size of ≤0.5mm. Accumulated water is drained by means of drainage ditches + catchment wells to ensure that there is no open water on the base surface during construction. 3D Dimensional Verification System

               I

I. Key Technologies and Quality Control of Rebar Planting Engineering Five-Step Drilling Construction ① Positioning and Setting-Out: Mark the bolt positions according to the drawings and identify them with red paint; ② Trial Drilling Detection: Select 5% of the bolt holes for trial drilling (depth 50mm), and conduct formal drilling only after confirming there are no reinforcing bars; ③ Aperture Control: For M36 bolts, the drilling diameter is 42mm, and the hole depth is 1100mm (100mm exceeding the design depth); ④ Hole Cleaning: Blow the hole with a high-pressure air gun 3 times, with an interval of 2 minutes each time, to ensure no dust remains in the hole; ⑤ Perpendicularity Calibration: Use a perpendicularity detector; if the deviation exceeds 1°, redrill the hole. Rebar Planting Adhesive Construction Process Select Grade A modified epoxy rebar planting adhesive, which must be used within 20 minutes after mixing; Control the glue injection amount to 2/3 of the hole depth. After inserting the bolt, rotate it 3 times to expel air bubbles; no disturbance is allowed duringcuring; Sampling rules for pull-out tests: Take 3 bolts for every 100 bolts. If 1 is unqualified, double the sampling; if still unqualified, rework is required.

III. Pipeline Groove Cutting and Foundation Treatment Technology Construction Requirements for High-Pressure Hose Grooves A diamond cutting machine is used for grooving: first, cut the contour line (depth 50mm), then excavate in layers to the design depth of 150mm; The inner surface of the groove shall be ground to a roughness of Ra ≤ 25μm, and the corners shall be rounded with R ≥ 10mm to prevent hose abrasion; The pipe-passing groove of the middle pier shall run through the upstream and downstream, with a groove width of 200mm and depth of 180mm, and a Φ50mm galvanized steel pipe shall be pre-embedded. Foundation Repair and Reinforcement Technology Treatment of damaged surfaces: Chisel off loose concrete until reaching the dense layer, apply an interface agent, and then repair with C40 fine aggregate concrete; Treatment of side wall surfaces: First, grind flat with an angle grinder, then apply two layers of polyurethane waterproof coating (dry film thickness ≥ 1.5mm); Reinforcement of inflation and exhaust pipe grooves: Implant a Φ12mm@200mm steel mesh, and pour a C25 fine aggregate concrete protective layer (thickness ≥ 50mm).

IV. Technical Difficulties and Countermeasures Conflict with steel bars in old foundations: If steel bars are encountered during drilling, the hole position can be offset by ≤50mm, but the bolt spacing deviation must be ≤±1mm. Meanwhile, the hole position of the upper pressure plate should be adjusted and recorded; Control of curing time for rebar planting adhesive: During summer construction, the curing time of the adhesive is shortened to 12 hours. In winter, electric tracing heating should be used for thermal insulation (temperature ≥15℃) to ensure that the 7-day compressive strength is ≥30MPa; Waterproof treatment of grooves: Before backfilling the pipeline groove, a 2mm-thick HDPE waterproof board should be laid, with an overlap width of ≥100mm with the side wall waterproof layer to prevent later leakage.