Recently, Pinghu City issued a revision of the "Notice on Strengthening Quality and Safety Management of Deep Foundation Pit Projects" (Ping Jian Guan [2021] No. 10). On April 9, the Construction Management Center of Pinghu Municipal Construction Bureau organized a briefing session on the revised content. Relevant persons in charge of Pinghu Construction Management Center and representatives from construction, supervision, survey, design, and testing units attended the meeting.


　　The meeting conveyed Pinghu City's further requirements for deep foundation pits in construction projects regarding design, construction, monitoring, etc., with emphasis on controlling the impact of engineering construction on the surrounding environment to ensure the safety of ongoing projects and adjacent buildings (structures). All relevant units must strictly implement their main responsibilities, hold the bottom line, and standardize construction. First, hold the bottom line. Foundation pit engineering has always been one of the major hazard sources in construction projects. All relevant units must adhere to the bottom-line principle, standardize construction, and ensure project safety. Second, strictly implement. Relevant entities should strictly implement all requirements in accordance with the document, clarify the scope of use of stretched steel sheet piles, strengthen design requirements for complex foundation pits, and improve the closed review process. Third, be ready for inspection at any time. This year, our bureau will increase inspection efforts on standardized construction of foundation pit projects, supplemented by random sampling of raw materials and core sampling of mixing piles. Once illegal activities are discovered, they will be resolutely punished. We hope all units will manage projects with a mindset of being ready for inspection at any time.

　　The newly revised notice specifically made the following changes: First, strictly control the scope of use of stretched steel sheet piles. Within the central urban area of Pinghu City, the use of Larsen steel sheet piles as the main stress-bearing system is prohibited. For deep foundation pit projects in other built-up areas where existing vehicle roads are present within 3 times the excavation depth of building engineering foundation pits, Larsen steel sheet piles shall not be used as the main stress-bearing system. Second, improve design requirements for situations such as pits within pits. For pit-in-pit projects, if the horizontal distance between the two pits is less than three times the height difference within the pit, the design scheme shall be calculated according to the depth of the deep pit. For foundation pit projects that use soil unloading to reduce the excavation depth, the excavation depth in the design scheme shall be based on the initial site elevation. Third, further improve the review process. The review shall designate the head of the expert group. For schemes "approved after modification," the head shall perform review and examination procedures and sign and confirm on the revision review record form. If there are important buildings (structures), underground pipelines, or roads around the foundation pit, the head shall organize expert group members to survey the site environment before the review.