Quality inspection and acceptance of drainage wells (slots), drains and drainage tunnels

1. After the foundation pit is excavated, it shall be inspected and accepted according to the requirements of the concealed project. After the acceptance is passed, the drainage well and the sink shall be constructed.
2. The depth of the foundation pit of the drainage well and the drainage chute shall not be undercut, and the over-excavation value shall not be greater than O.lm. The over-excavated portion of the substrate is applied with a tear level backfill of not less than C15.
3. The offset of the center of the wellbore should not exceed 10mm. The inner diameter of the well is allowed to offset by 20mm; the window diameter of the well seat, the top of the well and the window drainage well, the height of the frame beam of the framed drainage well, etc. Dimensions should meet the requirements.

1. After the excavation of the foundation trough, it should be inspected and accepted according to the requirements of concealed works. After the acceptance is passed, the drainage pipe construction can be carried out.
2. The base pipe of the drain pipe shall not be dug, and the over-excavation value shall not be greater than 50mm. The overcut part is applied with a concrete backfill of not less than C15.
3. The drain pipe thickness deviation must not have a negative value. The allowable deviation of the drainage pipe laying slope is 10% of the design value.

1. Tunnel excavation should not be undercut, and the average over-excavation value of the excavation radius of the flat hole should not exceed 250mm. The inclined hole and the vertical hole should not be larger than 250mm o The over-excavation control standard for the bad section can be agreed by the supervision engineer organization. , reported to the construction unit to determine.
2. The quality inspection of tunnel excavation shall be carried out before the completion of each excavation cycle and before the temporary support construction.

1. After the tunnel is completed, intermediate acceptance should be carried out before lining.
2. The contents of the tunnel lining quality inspection and the required values ​​or allowable deviation standards:
(1) Concrete strength: qualified.
(2) Section size: +10mm; Pre-buried and reserved parts: meet the design requirements.
(3) Flatness: 10mm.