Introduction of foundation pit enclosure requirements?

What is the basic situation of foundation pit enclosure in China at present? What is the basic profile? The following is the related content of Zhong Da Consulting Xiaobian about the requirements of foundation pit enclosure, and the basic situation is as follows:

When building deep foundation or underground engineering, it is often necessary to carry out deep earthwork excavation. This underground space excavated downward from the ground is called foundation pit. Deep foundation pit excavation involves the basement of a building or deep foundation pit, subway, municipal engineering, underground space development and utilization and other projects.

What are the requirements and basic conditions of building foundation pit enclosure in China at this stage?

(1) Ensure that the foundation pit maintenance system can play the role of retaining soil and stabilize the slope around the foundation pit;

(2) Ensure the safety of adjacent buildings, underground pipelines and roads. Around the foundation pit, it is not harmed by soil deformation, settlement, collapse or displacement during earthwork excavation and underground engineering construction;

(3) In areas with groundwater, measures such as drainage, precipitation and water interception should be taken to ensure that foundation pit construction is carried out above groundwater.

Matters needing attention in foundation pit enclosure requirements:

Points for attention in foundation pit enclosure are similar to those in adjacent tunnels. Mainly set warning signs, such as railings and other basic settings. The maintenance of foundation pit should be based on the looseness and weakness of foundation soil. Generally, railings are erected within a safe distance of 50 cm around the foundation pit. Railings can be assembled and erected with scaffolding steel pipes and connecting fasteners, and necessary lighting should be set around them to prevent accidents in construction at night.

Pay attention to drainage in rainy season, and check and reinforce the temporary enclosure regularly. When construction vehicles enter the site, the speed should be strictly controlled to prevent damage to maintenance facilities.

Requirements for construction in rainy season, winter and night:

1) Conduct a comprehensive inspection of the original drainage system, dredge it, and increase drainage measures when necessary to ensure smooth water flow.

2) When excavating a foundation pit (ditch) or pipe trench, fill ridges should be built around it to prevent rainwater from flowing in, and pay attention to the stability of slopes and straight walls. Support can be added when necessary, and the inspection of slope and support should be strengthened.

3) The construction in rainy season shall not rely on building walls and fences to pile up soil to prevent collapse accidents.

4) In winter, due to freezing, the soil becomes hard and difficult to dig. Therefore, technical measures to ensure construction safety should be specially formulated, and safety education should be given to operators. We should keep abreast of climate change so as to take protective measures in advance.

5) Anti-skid measures should be taken in rainy season and winter to ensure normal transportation and safety. Construction should be suspended during heavy wind and rain.

6) There should be sufficient lighting for construction at night, and red light signs should be added in dangerous areas such as deep pits and steep slopes to prevent casualties.

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