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Subdivided unequal-strength grouting reinforcement method adapted to tunnel construction close to building

A technology of grouting reinforcement and building, which is applied in the field of strong grouting reinforcement to achieve the effect of reducing reinforcement cost and good differential settlement

Inactive Publication Date: 2017-07-21
BEIJING MUNICIPAL CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems and deficiencies existing in the existing single-strength grout reinforcement of the stratum, the present invention provides a unequal-strength grouting reinforcement method suitable for the construction of tunnels adjacent to buildings. Improve the deficiencies of the existing grouting pre-reinforcement technology to achieve the goal of controlling the differential settlement of buildings and ensuring the coordinated deformation of structures

Method used

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  • Subdivided unequal-strength grouting reinforcement method adapted to tunnel construction close to building
  • Subdivided unequal-strength grouting reinforcement method adapted to tunnel construction close to building

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Embodiment 1

[0035] like figure 1 As shown, when the tunnel 2 needs to pass through the bottom of the building 1, grouting reinforcement is required between the building foundation 5 and the tunnel 2, and the reinforcement method of the present invention is realized through the following steps.

[0036] Step 1, determining the scope of the grouting reinforcement area according to the positional relationship between the tunnel 2 and the building 1;

[0037] In the construction where the tunnel 2 passes through the building 1, the grouting reinforcement area is generally set up under the building foundation 5 and above the tunnel 2. The length of the grouting reinforcement zone is mainly determined by the settlement tank width coefficient i (see figure 2 ) to determine, generally 5i length. The thickness of the grouting reinforcement area is generally 2-4m, and the width of the grouting reinforcement area is determined according to the width of the building foundation 5, usually not less ...

Embodiment 2

[0050] When the tunnel passes through the lower side of the building, this embodiment is different from Embodiment 1 when implementing the reinforcement method of the present invention: the grouting reinforcement area can be divided into left and right areas, which are respectively low-strength grouting The ratio of the length and dimension of the high-strength grouting area and the high-strength grouting area can be determined according to the geological conditions and the positional relationship with the building, and the width of the grouting reinforcement area is not less than the width of the building foundation. And choose the type of slurry reasonably according to the geological conditions and the conditions of the buildings. The strengthening method will be further described below through specific examples.

[0051] In a heat power external line project, the whole heat power line is constructed by submerged underground excavation method. The west side of the tunnel pro...

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Abstract

The invention relates to a zonal unequal-strength grouting reinforcement method suitable for the construction of a tunnel adjacent to a building. The method determines the range of the grouting reinforcement area according to the positional relationship between the tunnel and the building; and divides the grouting reinforcement area; Before the tunnel is excavated to the position close to the building, drill holes in the ground between the tunnel and the building and arrange multiple settlement monitoring points at the bottom of the building foundation; carry out unequal-strength grouting in the grouting reinforcement area and strengthen it in different areas ; After the grouting is completed, the excavation construction of the tunnel passing through the building is carried out, and the settlement monitoring point at the bottom of the building foundation is monitored in real time, and it is determined whether to carry out reinforcement grouting in the grouting reinforcement area according to the monitoring results; After the tunnel excavation is completed and the secondary lining is applied, the final effect of the sub-area grouting reinforcement of the tunnel adjacent to the construction of the building is judged by extracting the settlement data of the settlement monitoring points. The invention ensures uniform settlement and coordinated deformation of buildings during tunnel construction, and reduces reinforcement costs.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a unequal-strength grouting reinforcement method suitable for the construction of tunnels adjacent to buildings. Background technique [0002] In tunnel construction, the situation of passing through buildings sometimes happens. While digging the tunnel, it is necessary to strictly control the maximum settlement of the building caused by the excavation of the tunnel. As an effective measure to strengthen the ground, reduce ground settlement, and protect the safety of existing buildings on the ground, the grouting reinforcement control technology has been widely used in the engineering of tunnels passing through existing buildings. However, the current grouting pre-reinforcement technology is mainly considered from the control of the overall settlement of the building. Using a single-strength grout to strengthen the ground does not fully consider the differential settlement of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 连新增王海涛谢伟东黄明利李建华王建设孙宇潘政赵建明张旭王超李瀛
Owner BEIJING MUNICIPAL CONSTR
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