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Construction organization design of foundation pit row pile support and tube well dewatering

building structure (including Basics ）The safety level of foundation pit is Grade II, the design level of foundation pit is Grade B, and the safety level of foundation pit is Grade I. It is proposed to use row piles and soil nailing walls for foundation pit side wall support, and pipe well dewatering is adopted for dewatering design.

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Construction organization design of foundation pit row pile support and tube well dewatering - Figure 1

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1. According to the analysis of the geological survey report and the relevant construction experience of our company in xx area, the foundation soil condition of this project is relatively poor, and the relatively weak ③ silty sand layer series is locally weak and partially saturated in soft plastic shape, which is easy to cause shrinkage and hole collapse during drilling. ⑤ Silty clay mixed with silty soil layer, because it contains more groundwater, and the silty clay layer is weak, hole collapse is easy to occur during drilling; For medium to dense ⑥ silty sand mixed with silt, due to slow drilling construction speed, stress release will occur on the hole wall, which often results in mud inclusion on the pile body; The bearing stratum at the pile end is ⑦ clay layer, and enough attention shall be paid to the construction technology and method during the construction of bored piles. 2. The soil layers involved in foundation pit excavation and enclosure include ① miscellaneous fill soil layer, ② silty soil layer series, ③ silty sand layer; The pit bottom is mainly located in ④ clay layer with poor engineering performance, so the enclosure must be strengthened. 3. The positioning accuracy and perpendicularity of the deep mixing pile construction of this project are strictly controlled to ensure the continuous and uninterrupted lapping, the cement consumption, the water stop effect, and the water stop curtain effect are the key to the success of this foundation pit. During the construction of deep mixing piles, the amount of gunite and the overlapping length must be controlled. 4. The positioning accuracy and perpendicularity shall be strictly controlled during the construction of cast-in-place piles in this project. 5. There are many construction personnel of various types of work on the same site, so personnel management should be strengthened and the relationship between various types of work and teams should be well coordinated. 6. Since the underground water level of the project is high, the drilling speed shall be well controlled during the construction of uplift piles. The whole construction process is carried out in the open air. Therefore, the construction progress is inevitably affected by natural factors such as wind, rain and temperature. Full consideration shall be given to the construction plan and technical measures.

Topic: Dewatering design of foundation pit support Foundation pit dewatering Slope excavation of foundation pit support
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According to the Geotechnical Engineering Investigation Report of Changxing Mansion Project, according to the drilling, the groundwater in the site is pore type phreatic water, which is mainly stored in the Quaternary sand and pebble layer, and is recharged by atmospheric precipitation and the Anchang River. The site is about 35m away from the Anchang River. During the investigation, the static groundwater level in the site measured in the borehole is 7.50~8.00m. According to the 1:50000 urban geological regional survey data of Mianyang City of Northwest Sichuan Geological Brigade of Sichuan Provincial Bureau of Geology and Mineral Resources, the groundwater level in the site varies between 1.00 and 2.00m in dry and wet seasons. The historical highest groundwater level is taken as 2.00m below the natural floor (corresponding elevation is 455.00m). The excavation depth of the foundation pit and the depth of the manually excavated supporting pile do not enter the underlying bedrock, and the heavy well point (tube well) dewatering scheme is adopted for groundwater. The dewatering wells are arranged around the foundation pit. The spacing between dewatering wells is about 10.00~20.00m, and the depth of dewatering wells is 20.00m. A total of 21 dewatering wells are arranged. See the Layout Plan of Foundation Pit Dewatering Wells.

Topic: Dewatering design of foundation pit support Foundation pit dewatering Foundation pit support and dewatering works
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Omit!

Topic: Foundation pit support scheme selection Foundation pit support and dewatering works Dewatering design of foundation pit support
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Topic: Deep foundation pit soil nailing wall support Special construction scheme for composite soil nailing wall Foundation pit soil nailing support scheme
[Henan] 12m deep foundation pit soil nailing wall and pile anchor support and pipe well dewatering construction drawing
The plan of the foundation pit of this project is roughly rectangular, with the east-west length of about 178m, the north-south width of about 176m, and the excavation depth of 11.0~11.5m. The design depth of the foundation pit is considered as 12.1m. The safety level of foundation pit support is Level I. The foundation pit is supported by the upper soil nailed wall, and the lower row of piles+anchor cable support structure; In order to prevent the adverse impact of precipitation on the surrounding environment, a row of high-pressure rotary jet grouting pile water stop curtain wall is constructed. The foundation pit dewatering adopts the method of tube well dewatering, with 83 tube wells arranged, and the depth of tube wells is 25m. 18 pieces were prepared in 2013.

Topic: Foundation pit support construction of soil nailing wall Henan support construction drawing Construction drawing of soil nailing wall dewatering
Construction Drawing of Deep Foundation Pit Support with SMW Construction Method Pile and Enlarged Head Anchor Rod (Tube Well Dewatering)
The drawings include the surrounding environment and general layout plan, foundation pit support plan, support layout plan (I), anchor rod and support layout plan (II), support layout plan (III), dewatering layout plan, profile, etc. for your reference!

Topic: Construction drawing of deep foundation pit tube well Deep foundation pit support Construction drawing of anchor rod for deep foundation pit
Selection and application of row pile support scheme for soft soil foundation pit
This data is for the selection and application of the row pile support scheme for soft soil foundation pit. At present, the basement construction has been completed, and the practice has proved that the support is safe and reliable. The design idea is advanced and the construction quality is excellent. The support technology can be used for reference in soft soil foundation pit. The content is detailed and worth downloading.

Topic: Foundation pit support scheme selection Foundation pit support scheme for earthwork excavation Foundation pit support in soft soil area