Foundation pit support and dewatering project for Xi’an Science and Architecture Building
1. Introduction
The foundation pit was excavated vertically, with an average depth of 17.40m and a dewatering depth of 19.80m. In the process of foundation pit excavation and foundation pit dewatering, it was to ensure the safety of foundation pit and avoid the influence on the normal use of buildings and urban road around the foundation pit. At the same time the construction was difficult and long time limit for a project.
Foundation pit plan
The foundation pit was excavated without fertilizer trough (vertical), with an average depth of 17.40m and a dewatering depth of 19.80m. In the foundation pit excavation and dewatering, it is necessary to ensure the safety of the foundation pit and avoid affecting the normal use of buildings around the foundation pit and urban roads. At the same time, the construction was difficult and the construction period was long.
2. Solution
In order to ensure the foundation pit deformation of surrounding structures in the range of security, prestressed anchor cable composite supporting structure was mainly used in the pile foundation pit. In order to ensure the excavation, the precipitation was controlled, the design and construction of the project were carried on carry on according to the principle of "informatization construction, dynamic design". Horizontal deformation monitoring was conducted for the supporting structure of the foundation pit, settlement observation was conducted for surrounding buildings and urban roads, and water level observation holes were set at key positions around the foundation pit to monitor the change of underground water level.
3. Construction situation
The total area of the foundation pit is 11,248m2, and the construction period was 120 days. 337 pile revetings with pile diameter 800mm and 14 pile revetings with pile diameter 600mm were completed, total volume of 3,690.3 m3; 260.9 m3 crown beam, 21,953m anchor cable, 995.6m2 soil nailing wall support, 9,272.11 m2 shotcrete were completed. Foundation pit dewatering took 2 years.
Construction site of rotary excavation and drilling construction of revetment pile
Pre-stressed anchor cable
The total area of foundation pit is 11248m2, and the construction period was 120 days.337 slope protection piles with a pile diameter of 800mm and 14 slope protection piles with a pile diameter of 600mm have been completed and concrete of 3690.3 m3in total has been poured; crown beams (260.9 m3), anchor cables (21,953m), soil nailing wall support (995.6m2) and sprayed concrete (9272.11 m2) have been completed. Foundation pit dewatering lasted for 2 years.
4. Achieved accomplishment
The project has been completed safely and successfully, with qualified construction quality, in line with national and industrial engineering construction acceptance codes and relevant requirements of construction units, ensuring the safety of surrounding buildings and urban roads; After the completion of the project, significant economic and social benefits will be generated, providing technical references for similar deep and large foundation pit supporting and dewatering projects.
The slope protection pile construction completion
Supporting effect of foundation pit
The project was completed safely and the construction quality was qualified, which met the national and industrial engineering construction acceptance specifications and the relevant requirements of the construction unit, ensuring the safety of surrounding buildings and urban roads; After the completion of the project, it will produce significant economic and social benefits, and provide technical reference for similar large-scale deep foundation pit support and dewatering projects.
5. FAQ
Q1: Why don’t use regular foundation pit support such as the slope supporting?
A: According to the situation on site, it is considered that under the premise of safety, the excavation quantity of earthwork should be reduced as far as possible, the project cost should be reduced and the occupation area should be reduced.
Q2:What is the purpose of construction monitoring？
A: In order to ensure the safety of the surrounding buildings, it is necessary to strengthen the monitoring during the construction, timely and accurately grasp the deformation situation, to ensure the safety of the surrounding environment, and timely feedback information, so as to achieve information construction.
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