Construction process of first-inserting last-jetting type steel churning pile enclosing structure under low net space
A technology of enclosure structure and construction technology, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve problems such as deepening, impossibility of implementation, and difficulty in using in urban central areas, and achieve the effect of saving investment and small project scale
Inactive Publication Date: 2010-06-09
SHANGHAI URBAN CONSTR GRP +1
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Problems solved by technology
Although this method can deepen the original enclosure structure, it is relatively safe and reliable, but it is difficult to use in the urban center area
On the one hand, the construction using this method will affect ground traffic and involve the relocation of underground pipelines. On the other hand, this method cannot be implemented when the basement of the added layer construction is close to other underground structures
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[0025] The project example is the downward addition project of the underground shopping mall on the west side of Xujiahui Station of Shanghai Metro Line 1. figure 1 The current status of the underground structure is shown in the figure. As shown in the figure, the structure is an underground shopping mall structure with only one floor, and its headroom is only 4.1m. A plurality of columns 4 are provided between the top plate 2 and the bottom plate 3 as a vertical support structure; in addition, a lining 5 is also provided on the end sides of the top plate 2 and the bottom plate 3 . Among them, the enclosure structure 1 of the underground structure is in the form of reinforced concrete sheet piles. In order to ensure the safety of the underground structure, the length of the sheet piles is usually twice the excavation depth of the original underground structure. When the underground structure is added downwards, the depth of the original enclosure structure 1 cannot meet the ex...
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The invention provides a construction process of a first-inserting last-jetting type steel churning pile enclosing structure under a low net space. An underground space is utilized as a construction enclosure, and an enclosure structure is renewedly constructed at the inner side of an original enclosure structure by adopting a method that profile steel is first inserted, and then churning reinforcement is carried out. The process does not influence normal ground traffics during construction, does not need to carry out pipeline removal, has little environmental influence and is suitable for renewedly constructing enclosure structures of underground structures in the city center, particularly for renewedly constructing the enclosure structures of basement structures next to the traditional underground structures.
Description
technical field [0001] The invention relates to an urban underground construction method, in particular to a construction process for a section steel rotary grouting pile enclosure structure in which section steel is inserted first in a low-clean space, and then the rotary grouting pile is constructed. Background technique [0002] Rational development and utilization of urban underground space resources is to meet the needs of urban modernization and urban sustainable development. Due to the lack of scientific planning and overall arrangement, some existing basement structures cannot make full use of the underground space due to their small depth, resulting in a waste of underground resources. In order to expand the underground space, it has become an important idea to add floors to the existing basement structure. [0003] The basement structure usually consists of an enclosure structure, floor slabs, vertical columns and inner lining. In order to ensure the safety of the...
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IPC IPC(8): E02D7/26E02D5/36
Inventor 何拥军朱雁飞陶利张帆夏元旦李永迪
Owner SHANGHAI URBAN CONSTR GRP