Slip-casting lifting method for city tunnel passing through existing buildings

A grouting lifting and building technology, applied in construction, infrastructure engineering, soil protection and other directions, can solve existing buildings (structures) to achieve dynamic control without system method, pile end bearing capacity loss, weakened pile problems such as lateral constraints, to achieve the effects of high construction efficiency, reduced differential settlement, and inhibition of subsequent settlement

Inactive Publication Date: 2009-07-22
BEIJING JIAOTONG UNIV
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Problems solved by technology

Generally, pile foundation underpinning is required in the following situations: ① excavation passes through the vicinity of the pile foundation, which weakens the lateral restraint of the pile and reduces the bearing capacity of the pile; ② excavation passes through the pile itself, resulting in a significant increase in the bearing capacity of the pile Decrease or disappear; ③ Excavation passes through a place very

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  • Slip-casting lifting method for city tunnel passing through existing buildings
  • Slip-casting lifting method for city tunnel passing through existing buildings
  • Slip-casting lifting method for city tunnel passing through existing buildings

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[0027] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0028] This example adopts the technical scheme of the present invention for construction, and provides detailed implementation and specific operation procedures, but the protection scope of the present invention is not limited to the following examples.

[0029] Take a residential building underneath a tunnel in a certain city as an example. The residential building was built in 1994 and is a brick-concrete residential building. Its foundation is a mortared whole rubble foundation with a buried depth of 1.5m. The 7-story building has a total height of 20.1 meters and a rectangular plan shape with a length of 56 meters and a width of 10.5 meters. The first floor is a storage room with a height of 2.1 meters, and the other floors are 3.0 meters high. The surrounding rock of this section of the tunnel belongs to Grade VI, with no self-stabilization ability, and t...

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Abstract

The invention discloses a method used for realizing the grouting during lifting when the city tunnel is threaded through the existing buildings, belonging to the underground tunnel construction technology field. The method includes the following steps: (1) the vertical grouting-stop bracing is carried out; (2) the foundation of the existing building is reconstructed and the foundation is grouted for reinforcement; (3) the dynamic tracking lift-grouting is carried out; (4) the lifting of a reconstructed building is resumed to guarantee that the settlement and differential settlement of the building are still in the controllable scope and simultaneously the grouting is stopped when the single max lifting reaches 2 to 3 mm. The invention has the effects that the grouting-stop maintaining operation can effectively restrict the lateral displacement of a soil body so as to enhance the lifting effect on the existing building by the following grouting; the grouting to the foundation for reinforcement can enhance the density of foundation and form a bearing stratum so as to lead the grouting lifting process to be smooth, effectively restrict the succeeding settlement of the existing building and also reduce the differential settlement.

Description

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Application Information

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Owner BEIJING JIAOTONG UNIV
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