A Groundwater Treatment Method for Underground Excavation Construction in Composite Stratum Under Existing Buildings
A technology of existing buildings and composite strata, applied in the field of groundwater treatment, can solve problems such as poor feasibility, high demolition cost, and difficult coordination, and achieve the effects of avoiding demolition, speeding up the progress, and saving project costs
Active Publication Date: 2022-02-18
徐州地铁集团有限公司 +1
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Problems solved by technology
Problems such as the huge cost of demolition of existing underground structures, difficulty in coordination, poor feasibility, etc.
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Embodiment 1
[0025] Pengcheng Square Station of Xuzhou Line 1 is an open-concealed excavation and separation island station, and part of the platform layer is an excavation and separation island type station. It is located directly below the existing fashion avenue, and is constructed using the CRD underground excavation method. Fashion Avenue is a business with one basement and some two floors, with a total construction area of more than 13,000 square meters, and most of the shops are owned by individuals; the underground commercial street of Fashion Avenue takes into account the crossing functions of the four quadrants at the intersection of Huaihai Road and Zhongshan Road. Located in the commercial center of Xuzhou City, the passenger flow is very large, and the coordination of demolition and relocation is extremely difficult. According to the conventional design, it is impossible to construct a dewatering well in the existing structure, and it is also impossible to set a dewatering we...
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The invention discloses a groundwater treatment method for underground excavation construction in composite strata under existing buildings, which comprises the steps of: a) completing the main structure of an open excavation hall; 1 cross-section drainage pipe, and another 1 cross-section drainage pipe is auxiliary installed at the central position; c) Cutting down the underground diaphragm wall in sequence; d) Construction of initial support, temporary vertical braces and temporary horizontal braces within the thickness range of the underground diaphragm wall, And spray C25 early-strength concrete to achieve side frame spraying; e) set up large pipe sheds for the arch of the main tunnel excavated on the right and left lines, and actively release the water bag at the soil-rock joint surface of the arch; The pipe shed is grouted, and the grout is evenly diffused into the soil through the small holes on the wall of the large pipe shed; when the CRD is constructed one by one, small conduits are set in advance between the pipe sheds for grouting. The invention saves the engineering cost, accelerates the progress of the engineering, saves the construction period, and solves the difficult problem of arranging the dewatering well.
Description
technical field [0001] The invention relates to a groundwater treatment method for underground excavation construction in a compound stratum under an existing building, and belongs to the technical field of underground engineering. Background technique [0002] With the development of cities and the continuous accumulation of population to big cities, the building space in the city center is denser, and the traffic on the main road is more busy, which puts forward higher requirements for the construction of underground projects in the future. Problems such as the huge cost of demolition and relocation of existing underground structures, difficulty in coordination, and poor feasibility. Contents of the invention [0003] Aiming at the above-mentioned problems in the prior art, the present invention provides a groundwater treatment method for underground excavation in complex strata under existing buildings. [0004] In order to achieve the above object, a kind of undergrou...
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IPC IPC(8): E21D9/00E21D11/10E21F16/02E21D11/14E02D5/18
CPCE21D9/00E21D11/10E21F16/02E21D11/14E02D5/18
Inventor 姚西平张存胡清茂倪吉栋张国良王敦显翟可李龙王怀东梅展军杨晓猛李舸鹏孙浩徐小涛赵国智
Owner 徐州地铁集团有限公司