Method for reinforcing soft soil foundation in cushion layer replacement mode

Abstract

The invention relates to a method for reinforcing soft soil foundation in a cushion layer replacement mode. The method for reinforcing the soft soil foundation in the cushion layer replacement mode comprises the steps that (1) a position to be excavated is marked out in the soft soil foundation and an excavator is arranged at the position to be excavated; (2) a pit slot is excavated through the excavator and a soil layer and surface dust are cleaned up; (3) filling-replacement filling materials are prepared; (4) the filling-replacement filling materials are filled in the pit slot and are paved flatly and smoothly; (5) a vibration roller is used for grinding the pit slot filled with the filled filling-replacement filling materials; (6) the surface of the filling-replacement filling materials is kept being wet after being grinded, maintenance is started after the filling-replacement filling materials are finally coagulated, and the maintenance time is 30 to 40 days. Compared with the prior art, the method for reinforcing the soft soil foundation in the cushion layer replacement mode enables the soft soil foundation to be high in reinforcing quality, high in intensity, convenient to construct, low in cost, and significant in economical benefit.

Description

technical field [0001] The invention relates to a method for strengthening soft ground, in particular to a method for strengthening soft ground by replacing cushion layers. Background technique [0002] With the rapid development of power grid construction, the basic design of transmission lines is related to the safe operation of the line, and more importantly, the investment and comprehensive benefits of the project. At present, the commonly used foundation types are: ① slab foundation; ② bored pile foundation. Among them, the straight column foundation is generally used in areas with good geological conditions, while the cast-in-situ pile foundation is generally used in unfavorable geological areas such as river ponds and soft soils. [0003] In the area of ​​soft soil foundation, the design of the tower foundation in the soft soil foundation area has its particularity because the design of the tower foundation should not only meet the design requirements of the general ...

AI Technical Summary

Problems solved by technology

[0005] (1) The bearing capacity of the foundation of the bearing layer is low, and the shallow covering soil layer is thick, which results in a larger area and deeper foundation burial for the general iron tower shallow foundation (slab foundation) compared with other areas. Deep, the excavation volume of earthwork is large, and the amount of concrete and steel bars is also large

[0006] (2) The width of the slab foundation bottom plate is large, and the foundation is greatly affected by external interference. For example, uneven loading near the tower position or excavation of fish ponds and ditches will cause damage to the stability of the foundation foundation

[0007] (3) For iron towers with a large foundation bearing capacity such as four circuits on the same tower and 500kV lines, if the slab foundation is used, the width of the floor will be very large, and even the slab foundation cannot meet the design requirements, so the entire line must use bored pile foundations

The pile foundation is a deep foundation, and the investment cost is large, and its cost is 2 to 4 times that of the slab foundation, which makes the foundation cost of the entire line very high