Method for repairing ground surface settlement or underground pipe deformation on outer side of foundation pit enclosure wall

Abstract

The invention discloses a method for repairing ground surface settlement or underground pipe deformation on the outer side of a foundation pit enclosure wall, which comprises the following construction steps of: arranging a plurality of monitoring points on the ground surface on the outer side of the foundation pit enclosure wall, monitoring equipment is adopted to timely obtain a ground surface soil body settlement value on the outer side of a foundation pit enclosure wall or an underground pipe deformation settlement value or an underground pipe deformation horizontal movement value when the foundation pit is excavated; according to the height position, the transverse position and the horizontal direction or the inclined direction which are obtained according to the monitoring values and need to be repaired, the position and the direction of a construction hole in the foundation pit support wall are determined; a drilling machine is adopted for drilling holes, grouting pipes, anchor rods and a plurality of geotechnical cloth bags extending in the axial direction are placed, each geotechnical cloth bag is filled with cement grout through grouting, and the solidified grouting bodies form a set of grout bags so as to lift earth surface sinking soil bodies on the outer side of a foundation pit or reset deformed underground pipes. According to the method, construction is not conducted on the earth surface on the outer side of the foundation pit, grouting is highly targeted to lifting recovery of the earth surface or resetting of the underground pipe, and the recovery or resetting effect is good.

Description

technical field [0001] The invention relates to the technical field of foundation reinforcement, in particular to a method for repairing surface settlement or deformation of underground pipes on the outer side of a retaining wall of a foundation pit. Background technique [0002] During the development and construction of the underground space in the soft soil area, the soil excavation process in the foundation pit will generally cause the foundation pit retaining wall or the foundation pit retaining structure such as the underground diaphragm wall or the outer water-stop curtain and the inner supporting piles. The formed retaining wall is displaced to the inside of the foundation pit, and this displacement will cause the soil outside the foundation pit or the outer side of the foundation pit retaining wall to deform toward the foundation pit retaining wall, resulting in surface settlement or various pre-buried underground of municipal engineering. Tube deformation. In part...

AI Technical Summary

Problems solved by technology

The grouting repair method of surface settlement outside the foundation pit or underground pipe deformation in the above prior art still has the following deficiencies: due to vertical grouting or oblique grouting from the surface down, the lifting recovery of the ground surface or the reset of the deformation of the underground pipe The pertinence is not strong. For example, the lifting effect on subsidence or subsidence is not obvious, the position that needs to be lifted may not be lifted, and the position that does not need to be lifted may be lifted again

Therefore, the restoration or reset effect of this grouting method is not obvious, and the proportion of cement grout that does not play the role of restoration or reset is relatively large, resulting in a large waste of grout and high repair costs

And because the grouting is performed on the surface that needs to be repaired outside the foundation pit, traffic control is required throughout the construction process, which brings inconvenience to traffic, and the construction space is limited, which may hinder normal construction and may damage the original road surface and facilities, and the construction equipment vibrates on the surface or ground to be repaired, and may cause new surface settlement or deformation of underground pipes

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