The quality acceptance criteria for the construction of anti-float anchor rods mainly include the following aspects:

**I. Raw Materials**

Rebar:

Rebar types, specifications, and properties should comply with design requirements and current national standards.

For instance, the mechanical properties such as yield strength, tensile strength, and elongation of steel rebars should meet the corresponding standard requirements.

- Verify quality certification documents and sample retest reports to ensure the reliability of the steel reinforcement quality.

Cement:

Cement types and strength grades should meet the design requirements.

- It is strictly prohibited to mix cement of different varieties and strength grades.

- Tests are conducted on the cement's stability, setting time, and strength, ensuring that its performance indicators meet the relevant standards.

3. Sand, stone, and other aggregates:

- The fineness modulus, silt content, and mud ball content of the sand should meet the specifications.

The particle gradation, silt content, clay lumps content, and needle-like and flake-like particle content of the stone should meet the respective standards.

**II. Construction Process**

Drilling:

The bore diameter, depth, and position deviation of the holes should meet the design requirements.

Generally, the aperture deviation does not exceed ±10mm of the designed aperture, the hole depth deviation does not exceed ±50mm of the designed depth, and the hole position deviation does not exceed 100mm.

- Inspect using measuring tools (such as calipers, measuring tapes, etc.).

2. Deburring:

- The cleaning of holes should be thorough, and the thickness of sediment at the bottom of the holes should meet the design requirements.

- Normally, the thickness of sediment at the bottom of a well does not exceed 50mm, and it can be measured using a measuring line or sediment meter.

3. Anchor Rod Manufacturing and Installation:

Anchoring bar reinforcement or steel strand length, diameter, and connection methods should comply with design specifications.

The quality of steel reinforcement welding must meet relevant standards, with the weld joints being full, free of slag and pores, and other defects.

- Anchor rods should be centered within the holes, and collision with the hole wall should be avoided during installation.

4. Grouting:

- The mixing ratio of the casting material should meet the design specifications.

- The water-cement ratio of slurry and the sand-cement ratio of mortar should be accurately controlled.

- The grouting pressure and volume should meet the design requirements to ensure that the grout fills the boreholes completely and bonds well with the surrounding soil or rock mass.

- Review grouting records and the actual grouting conditions on-site.

5. Anchor Rod Tensioning and Locking

- The tensioning of anchor rods should be carried out after the grouting body reaches a certain proportion of the designed strength (usually 75% or more).

- The tension should meet the design requirements and be applied using calibrated tensioning equipment.

- After locking, the anchor should be tightly attached to the anchor rod, and the locking force should meet the design requirements.

Section 3: Quality Inspection

Anchor Bolt Pull-Out Test

- The anchor rod's pull-out resistance is tested on-site to ensure it meets design requirements.

- The number of tests should comply with relevant specifications, generally not less than 3% of the total number of anchor rods, and at least 3 rods.

- During testing, the load is分级applied, with each level being 10% - 20% of the design tensile force. Record the displacement of the anchor rod at each load level. Stop loading when the anchor rod shows signs of failure or when there is a sharp increase in displacement.

- The measured pull-out resistance of anchor rods should not be less than the design value.

2. Grouting Density Inspection

- Dense packing of grouting can be detected using methods such as acoustic wave testing and core drilling.

- The Soundwave Detection method determines compactness by measuring the propagation speed and attenuation of sound waves within the grouting material, while core drilling allows for direct observation of the grout filling and the strength of the结石 bodies.

The density of the castable should meet the design requirements, with no obvious defects such as voids or looseness.

Section 4: Other Aspects

Construction Records and Acceptance Documents

- All records during the construction process should be comprehensive and accurate, including drilling records, grouting records, and anchor tensioning records.

- All acceptance documents should be complete, including quality certificates for raw materials, inspection reports, construction plans, and records of concealed work acceptance.

2. Appearance Quality:

Anchoring rods should be free from visible rust, damage, or other defects.

- Corrosion protection for anchor heads and equipment should meet design requirements.