Method for supporting underground layer increasing of existing building by supporting structure and underpinning structure

Abstract

The invention discloses a method for supporting underground layer increasing of an existing building by a supporting structure and an underpinning structure. The method comprises the steps that an annular reinforced concrete underground continuous wall is constructed on the outer side of a frame structure independent foundation; (2) reinforced concrete underpinning piles are constructed on the outer sides of the four corners of several rows of independent foundation frame columns in the middle and the outer sides of two corners on the inner side of an outer side independent foundation frame column; (3) a horizontal underpinning beam is constructed at the height position on the top of the independent foundation, the beam wraps the frame columns from the periphery, the lower end of the beam is supported at the top ends of the underpinning piles, the frame columns in different axes are also connected into a whole through the underpinning beam, and the two ends of the underpinning beam are connected with the underground continuous wall on the outer side; (4) the independent foundation at the lower ends of the frame columns is cut off; (5) a layer of basement earthwork within the layer high range is dug, and the next layer of horizontal underpinning beam is constructed at a pit bottom; (6) the step (5) is executed again until the bearing earth stratum of a basement bottom plate is reached; (7) the basement bottom plate, all layers of floor slabs and a top plate are constructed from bottom to top, and the basement structure construction is completed.

Description

technical field [0001] The invention relates to a civil construction technology, in particular to a method for using a support structure and an underpinning structure to support an existing underground building. Background technique [0002] Orderly, reasonable, comprehensive and efficient development and utilization of underground space resources of existing buildings has become one of the most effective ways to expand infrastructure capacity, improve urban comprehensive disaster prevention capabilities, improve land use efficiency and save land resources. According to the requirements of urban planning, most new buildings have considered the development and utilization of underground space. However, a large number of existing buildings have not designed underground parking lots due to historical reasons and lack of forward-looking. With the increase in the number of cars, it is difficult to park. Therefore, the development of the underground space of existing buildings is...

AI Technical Summary

Problems solved by technology

Although this method sets a circle of cast-in-place piles and jet grouting piles as the soil retaining and water-stop support of the foundation pit, the structure is not connected with the underpinning structure and cannot share the upper load, and there is no horizontal member as the support structure The internal support and the stress system of the support structure are not reasonable

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