Building jacking deviation rectifying method
A building and deflection correction technology, which is applied in the direction of building construction, construction, building maintenance, etc., can solve the problems of foundation rebound and decline, and achieve the effect of ground elevation recovery, high success rate, and accurate control of jacking volume
Active Publication Date: 2015-03-25
CHEM IND GEOTECHN ENG
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Problems solved by technology
The existing jacking and underpinning correction method will cause the foundation rebound to decrease due to the load of the superstructure and the gap between the foundation and the prefabricated reinforced concrete pile after the jack is removed.
Method used
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Embodiment Construction
[0018] The present invention will be further described below in conjunction with the accompanying drawings.
[0019] This embodiment is to rectify the cracking of the wall caused by the uneven settlement of one side in a building.
[0020] First, estimate the required jacking amount according to the inclination of the wall, for example, the jacking amount is 350mm. Then excavate the pilot pit, compare figure 1 , excavate a pilot pit 3 on the outdoor floor 1 of the wall foundation 4 to be rectified, expand from the pilot pit 3 along the lateral direction of the wall foundation, and continue to excavate downwards to the bearing layer along the vertical bottom of the foundation, at this time An underpinning tunnel 5 is formed under the foundation; concrete underpinning pile piers 6 are poured in the underpinning tunnel 5 until the upper end surface of the underpinning pile pier 6 is 500 mm from the lower end surface of the building foundation. After the pouring of the underpinn...
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The invention relates to a building jacking deviation rectifying method which comprises the following steps of: excavating a guide pit on the outer side of a foundation of a building to be subjected to deviation rectification, transversely expanding from the guide pit along the foundation of the building, and excavating downward along the vertical direction of the foundation till a supporting layer to form an underpinning tunnel below the foundation; pouring a concrete underpinned pile pier in the underpinning tunnel, wherein a gap of certain distance is reserved between the upper end of the underpinned pile pier and the lower end of the building foundation; erecting a jack on the underpinned pile pier, and jacking the building foundation upward by use of the jack, and then placing a plurality of prefabricated reinforced concrete pile caps, wherein a plurality of expansion screws are arranged at the upper ends of the pile caps; applying force to the expansion bolts for expansion, and dismantling the jack; pouring expansion concrete on the side surfaces of the prefabricated reinforced concrete pile caps; and grouting between the underpinned pile piers so that a soil layer below the building foundation is dense. As the expansion bolts and expansion concrete are used in a construction process, the problem that the upper building foundation rebounds and drops after the jack is dismantled is solved.
Description
technical field [0001] The invention relates to the field of building methods, in particular to a method for correcting deviations in building jacking. Background technique [0002] The leaning of buildings is a problem all over the world. The center of gravity of the building deviates too much from the centroid of the base due to the uneven thickness of the foundation soil, uneven hardness, poor foundation stability, great influence from the environment, inaccurate survey, wrong design, insufficient foundation bearing capacity, improper layout or use. Large, weak foundation soil, small foundation burial depth and other reasons often cause the building to sink unevenly, causing inclination, warping, cracking, sinking and other diseases. In addition, there are row upon row of urban buildings, the development of underground space, and the excavation of deep foundation pits often cause uneven subsidence of buildings adjacent to the ground, causing cracking and tilting of the g...
Claims
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IPC IPC(8): E04G23/06
Inventor 程华根王涛
Owner CHEM IND GEOTECHN ENG