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Special construction design for earthwork excavation, deep foundation pit support and dewatering safety

This document is a special construction design for earthwork excavation, deep foundation pit support and dewatering safety. The content includes the special construction scheme for earthwork excavation, deep foundation pit support and dewatering safety. The contents are detailed for reference.

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Special construction design for earthwork excavation, deep foundation pit support and dewatering safety - Figure 1

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Special scheme for foundation pit support and dewatering of earthwork construction
Building 6 # 7 # 8 # of Phase III of Changzhou Feilong Living Area Lot 2 # Project is located on the roof of the basement. The basement is a negative floor, with an elevation of ± 0.000 equivalent to 5.550m of the Yellow Sea elevation. The design service life is 50 years. The number of floors above the ground of Building 6 # 7 # 8 # is 31, 30, and 28, with building heights of 96.25m, 93.15m, and 90.05m respectively. The total floor area above the ground is 58492m2, and the floor area of the basement is 6300m2. The foundation type is pile raft foundation. The prestressed hollow square pile (prestressed concrete pipe pile) is 10m long, and the pile type is PHS-AB500 (300) - 10. The structure type is frame shear wall structure. The seismic fortification intensity of the building is 7 degrees, and the seismic grade is II. The floor elevation of the basement under the main building is -5.40 m and -5.250 m, the floor thickness of the basement under 6 # 8 # building is 1.25 m, the floor thickness of the basement under 7 # building is 1.10 m, the floor elevation of the basement on the south side of 6 # 7 # 8 # building is -5.250 m, the floor thickness is 0.4 m, the cushion thickness is 0.1 m, and the natural floor elevation is -1.85 m, so the depth of large area excavation earthwork=5.4+1.25+0.1-1.85=4.9 m, The deepest part of the excavation is the sump 2.2 * 1.2 * 3.2m beside the elevator shaft, which needs foundation pit support and dewatering. The excavation site is relatively open, without building obstacles.

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Mechanical excavation and millisecond blasting are adopted in this project. The slope surface is supported by temporary mesh shotcreting and composite soil nailing, with mesh shotcreting.

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The waist beam of the anchor cable in this project is made of two 32 I-beam steel. The waist beam is temporarily fixed with the support pile by means of dowel bars. In addition, in order to ensure the stress contact between the anchor beam and the supporting pile, before the construction of I-beam steel, the "leveling" treatment should be achieved at the contact surface between the pile foundation and the anchor beam by means of digging the convex surface, spraying concrete (pouring) the concave surface, installing the anchor backing plate, working anchor plate and working clip, and pre locking the cable body.

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The direct organizer of the project technology and construction quality management work is responsible for leading the project technical management personnel to fully complete the contract according to the technical specifications and design drawings. He is the direct commander who fully implements the quality intentions of the superior and the supervising engineer. The technical work must be careful and practical to ensure that the construction quality meets the requirements of the construction contract.

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1) This project is the construction project of Shaoguan Moercheng Real Estate Co., Ltd. The total area of foundation pit excavation is about 52400 ㎡, of which the area of the north plot is about 38000 ㎡ (about 26000 ㎡ for plots A~B~C~D~E~F~A; E~H~I~J~E plot is about 12000 ㎡), and the south plot is about 14400 ㎡; 2) This project uses three types of steel: Grade III steel, Grade II steel, Grade I steel, and three types of steel. The reinforcement is designed to be lap joint for support pile, crown beam and waist beam reinforcement. The concrete strength grade is C25 and C20. 3) . See the construction design drawings for other details.

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The sewage discharged from the temporary toilet on site is settled in a 6m × 1.2m × 1.2m sediment tank, and then treated in a three-stage septic tank before being discharged to the municipal sewage pipeline. General domestic water, construction drainage, car wash tank drainage, etc. are discharged to the sedimentation tank through brick drainage ditch for sedimentation, and then discharged into the municipal pipeline.

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The foundation pit of the project is divided into four areas, the first area is the foundation pit west of axis 1-11; The second zone is the foundation pit where axis 1-11 intersects axis 2-1 and axis 1-L intersects axis 1-B; The foundation pit in the third area except for the first, second and fourth areas; The fourth zone is the foundation pit with axis 2-1 and axis 2-25 intersecting axis 2-L and axis H. The excavation sequence is Zone 1 → Zone 2 → Zone 3 → Zone 4 The slope of foundation pit in Zone 1 is designed to be 60 degrees, and the depth is 6.8m-7.8m; The slope of foundation pit in Zone 2 to Zone 4 is 45 degrees, and the depth is 2.8m-4.0m

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Deep foundation pit Cad drawing of excavation, support and dewatering scheme
This drawing is a cad drawing of deep foundation pit excavation, support and dewatering scheme, including foundation pit guardrail, foundation pit temporary staircase drawing, foundation pit inspection record sheet, etc., for reference

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Excavators and transport vehicles can only be parked on the subgrade box, not directly on the horizontal support. The transportation road in the site shall be made according to the design requirements.

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The foundation pit enclosure design of this project adopts the scheme of Φ 426 (locally Φ 500) sinking cast-in-place pile plus a reinforced concrete internal support retaining soil, and single row (locally double row) Φ 500 cement mixing pile for water stop. The project ± 0.000 is relative to the elevation of 4.150m in the Yellow Sea. For the cast-in-place pipe sinking pile, the concrete strength of the pile body is C25, and the reinforcement is set throughout the length. See the design drawing for details; 42.5MPa ordinary cement is used for cement mixing pile, and the mixing amount is 15% of the weight of the reinforced soil (the soil weight is 18.5KN/m3); The base of the elevator shaft shall be reinforced by compaction grouting.

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Key, during excavation, the grab bucket shall be at least 30cm away from the enclosure to avoid impact. ② Excavators and transport vehicles can only be parked on the subgrade box, not directly on the horizontal support. The transportation road in the site shall be made according to the design requirements. ③ Monitor enclosures and pipelines,

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Control points: 1. The deepest part of the foundation excavation depth shall be selected: the equipment foundation at the exit section (-7.55m) and the equipment foundation at the entrance section (-7.10m) shall be designed for foundation pit excavation. Other parts with excavation depth of more than 4m (including 4m) shall also be constructed according to this. Overall arrangement of foundation pit construction: earth excavation of equipment foundation in entrance section → earth excavation of equipment foundation in exit section.

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The metallurgical logistics center business building project is located in Zhangjiagang City. The main building of the project has 10 floors, and some auxiliary buildings have 3 and 5 floors. The first floor of the underground civil air defense has a building height of 42.3m. The total building area is 20148 ㎡, including 4406 ㎡ underground building area and 15742 ㎡ aboveground building area; The main building structure of the building is a frame structure, and the foundation is a pile raft composite foundation. The project is invested and constructed by Jiangsu Yangzijiang International Metallurgical Industrial Park, designed by Huadian Architectural Design and Research Institute, geological survey by Zhangjiagang Architectural Design and Research Institute Co., Ltd., supervised by Jiangsu Zhongxin Engineering Investment Project Management Consulting Co., Ltd., and construction organized by Jiangsu Huaiyin Construction Engineering Co., Ltd.

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① Project name: Phase I of Mingzhu Huayuan Community in XX City ② Project location: Qinggong Road in the west, Daqiao West Road in the north, Xindaihe in the south ③ Construction unit: XX Jinchengguan Real Estate Co., Ltd. ④ Design unit: XX Civil Architecture Design and Research Institute ⑤ Foundation pit maintenance design unit: XX Geological Engineering Survey Institute of the Ministry of Chemical Industry ⑥ Safety supervision department: XX Municipal Construction Project Safety Supervision Station ⑦ Quality requirements: acceptable ⑧ Scope of work: basement foundation pit support, dewatering and earthwork excavation ⑨ Contracting method: according to the drawings provided by the Employer, project nature, project characteristics and construction site conditions, our company will undertake the contracting by way of contracting for materials, quality, construction period, safety and civilized construction.

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The project is a Class II high-rise building with a total floor area of about 213101 ㎡ (including 49784.4m2 underground), consisting of 27 floors above ground and one floor underground of 1 #, 2 #, 5 #, 6 #, 7 #, 8 #, 17 # and 18 # buildings. The first and second floors of 1 # and 2 # buildings are shops. Eleven floors above the ground of 3 #, 4 #, 9 # and 15 # buildings One floor underground, six floors above the ground and one floor underground of buildings 10 # and 11 #. Building 12 # has four floors above ground and one floor underground. Building 30 #, 31 # and 32 # are shops on the second floor. The underground garage is the first floor underground, and the underground garage is the garage Parking area.

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The residential buildings of Block A-4 B - 3 and 1 # underground garage project of Phase II of the United Company's No. 7 Yard; Project construction site: South of Huayang Middle Road, Zhuozhou City, Hebei Province; Shear wall structure; Block A-4 has 2 floors underground and 9 floors above the ground. The standard floor height is 2.9m, the total building area is 8500.8m2, and the building height is 26.4m; Block B-3 has 2 floors underground and 26 floors above the ground; The total building area is 19420.4 square meters, and the building height is 75.7 meters. 1 # underground garage is 4500 square meters. The excavation depth is -7.93m.

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The plane of the foundation pit of the project is roughly rectangular, with the maximum length from north to south of about 235m and the maximum width from east to west of about 195m. At present, the natural ground is relatively low, about -0.5m below ± 0.00. Some areas of the site have been excavated to - 3.0m. The construction waste in the north has a certain impact on the construction of the soil nailing wall.

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The project adopts open pumping and open drainage to deal with the problem of water seepage in the pit during the excavation of foundation pit. Considering that the depth of foundation pit excavation is relatively large, in case of water inrush and other problems, the excavation construction can be combined with the construction situation.

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2.3 Overview of foundation pit support design 1. ± 0.000 of the project is equivalent to the Dagu elevation of 2.850, and the Dagu elevation on the site is considered as 2.30, which is equivalent to the building elevation of -0.550. The following are the relative elevations of buildings.

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During mechanical excavation, always use a theodolite to drive the axis into the foundation pit to prevent the excavation of the foundation pit from being large or small.

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The public building supporting project in Dayuan core area has a total land area of 7299.96m2 and a total building area of 28831.26m2, including 13322.86m2 above ground and 15508.40m2 underground; the number of floors: 6 above ground and 3 underground; The building height is 27.35m.

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The land scope of the project is located at Zhongmensigou in Mentougou District in the north, Xifu Road of the Sixth Ring Road in the east, Xiyuan Road in the west and high-voltage corridor in the south.

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Hengxian Citizen Center Construction Project is developed and constructed by Guangxi Hengxian Guotai Investment Development Co., Ltd. The project is located in the south of Molihua Avenue, Hengxian County, Nanning, Guangxi. The built municipal road is 10 m to the east and 10 m to the west of the basement, and the proposed municipal road is 10 m to the south of the basement.

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The general contracting project for the construction of an apartment building project is located in Hailian Road, Guangzhou City. The foundation pit support is rotary excavation cast-in-place pile+reinforced concrete internal support. The foundation is rotary excavation cast-in-place pile foundation, frame shear structure, 2 floors underground, 3555.8 m2 underground building surface, 22 floors above ground, 16079.75 m2 above ground building area, 72.7 m total building height, and 19635.55 m2 total building area. 2. The project adopts the Pearl River elevation; The design elevation ± 0.000 is equivalent to the absolute elevation of 8.000m.

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The metallurgical logistics center business building project is located in Zhangjiagang City. The main building of the project has 10 floors, and some auxiliary buildings have 3 and 5 floors. The first floor of the underground civil air defense has a building height of 42.3m. The total building area is 20148 ㎡, including 4406 ㎡ underground building area and 15742 ㎡ aboveground building area; The main building structure of the building is a frame structure, and the foundation is a pile raft composite foundation. The project is invested and constructed by Jiangsu Yangzijiang International Metallurgical Industrial Park, designed by Huadian Architectural Design and Research Institute, geological survey by Zhangjiagang Architectural Design and Research Institute Co., Ltd., supervised by Jiangsu Zhongxin Engineering Investment Project Management Consulting Co., Ltd., and construction organized by Jiangsu Huaiyin Construction Engineering Co., Ltd.

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The total construction area of the project is 111487.17m2, which is composed of 14 residential buildings, 2 # basement, 3 # distribution room, 1 # switching station, etc. The design elevation ± of this project is the absolute elevation of the Yellow Sea elevation. The natural ground elevation is considered to be+5.5m. The elevation of the foundation slab of 2 # and 3 # plots is+1.05m, the slab thickness is 450mm, and the cushion cap height is 1150mm. The elevation of the foundation slab of 11 #, 16 # and 26 # buildings on the east side is+2.87,+4.37, and the slab thickness is 300~350mm. The excavation of the foundation pit is considered as the cushion layer of the slab bottom (or cushion cap), and the excavation depth is 1.58 m~5.8m, The 2 # basement is multilateral, with the longest from north to south of about 160m and the widest from east to west of about 215m.

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The project is located in Yuelu District, Changsha City, Hunan Province. It is adjacent to Changshaolou Expressway in the south, Yuchi Road in the east and Zhida Road in the west. The project consists of two plots, S1 and S2, with a total construction area of 317998.43 ㎡, of which S1 has a construction area of 144840.43 ㎡.

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Xx station Deep foundation pit Special construction scheme for earthwork excavation and support
Contract section 12 of xx project of xx metro includes one station and one section, namely, xx station, xx station to Nanbalizhuang station. Xx Station is located at the west side of the intersection of the east-west Zuoan Road and the south-north East Third Ring Road South Inner Auxiliary Road. It is arranged in a northeast southwest direction across Zuoan Road, with a starting and ending mileage of K25+509.45~K25+723.000, and a total length of 213.55 meters. The open excavation of the station is a two story, three span box frame structure. The width of the standard section is 23.1m, the buried depth of the bottom plate is 17m, and the thickness of the top plate is 4m. The auxiliary structure of the station includes three entrances and exits, three transfer channels and two air ducts; The south end is the shield launching shaft. The foundation pit support system adopts the form of bored pile+steel support structure. Most of the crown beams set on the top of the retaining pile are 800 * 800mm, and the top of the crown beam of the pile top is set with a 200mm thick C25 reinforced concrete retaining wall. Two steel purlins are set in the middle of the foundation pit, and the steel purlins are made of double jointed I45b steel. Three steel supports are set in xx station. The first steel support is set along the crown beam, and the middle distance of steel pipe support is mostly 6m. The second and third steel supports are set along the steel purlin, and the middle distance of steel pipe support is mostly 3m. A concrete retaining wall is set at both ends of the station excavation section.

Topic: Special construction scheme for deep foundation pit support Special construction scheme for earthwork excavation and support Special construction scheme for earthwork slope support
Deep foundation pit Safe construction scheme for earthwork excavation
This project is the earthwork excavation of the comprehensive water pump house of Guangshan Kangheng Environmental Biomass Cogeneration Project. According to the Geotechnical Investigation Report (Project No. 17-053 Guangshan Kangheng) provided by Xinyang Architectural Design and Survey Institute, - 0.6m~-2.8m is the plain soil layer, - 2.8m~- 8m is the silty clay layer, and the site elevation of the comprehensive water pump house area is about - 0.6m, The excavation depth includes suction tank, fire water tank, suction tank, compressed clean water tank, sludge tank, backwash buffer tank, and the bottom design elevation of -5.800m, -5.100m, -6.600m, -5.600m are all on the silty clay layer.

Topic: Safe construction scheme for foundation pit earthwork excavation Safety technical disclosure of foundation pit earthwork excavation Earth excavation and foundation pit support
Deep foundation pit Safety Assurance Measures for Earth Excavation. doc

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Deep foundation pit earthwork excavation safety construction scheme Deep foundation pit earthwork excavation safety construction scheme Excavation safety construction scheme

Topic: Safe construction scheme for foundation pit earthwork excavation Safety technical disclosure of foundation pit earthwork excavation Earth excavation and foundation pit support