ground reinforcement

（2） Foundation reinforcement:

(1) The situation of building subsidence:

Usually, after the foundation sinks, the house will experience a relatively uniform overall sinking without tilting in any direction; And there are also some cases where the houses experience uneven sinking and tilt towards a certain side. Usually, after reaching a certain degree of inclination, the building becomes overwhelmed and tilts at an increasing speed, affecting the use of the house and even affecting adjacent buildings.

(2) The main methods of foundation reinforcement are:

1) Foundation grouting reinforcement

The foundation grouting method is to inject certain solidifiable grout into the cracks or pores of the rock and soil foundation, in order to improve its physical and mechanical properties. It can achieve the purpose of anti-seepage, leak repair, reinforcement, and correction of building tilt.

2) Building foundation reinforcement and correction method

The existing building correction and reinforcement methods can be divided into two categories: forced landing correction and jacking correction. Emergency landing correction starts from the foundation and forces the building to sink by changing the original stress state of the foundation; Lifting correction starts from the building structure and adjusts the structure itself to meet the purpose of correction. Therefore, overall, emergency landing correction is more economical and easier to construct than jacking correction, but when it is not suitable to use emergency landing correction, jacking correction can be used. In special circumstances, multiple correction methods can be used comprehensively.

Firstly, the principle of housing correction:

Before correction, a detailed investigation should be conducted on the settlement, inclination, cracking, structure, foundation, surrounding environment, geology, hydrology, and other conditions of the correction project to customize a thorough correction plan.

2. It is necessary to combine the original data, cooperate with supplementary exploration and measurement, clarify the actual situation and state of the foundation and upper structure, and analyze and identify the reasons for the deviation.

When carrying out correction design, full consideration should be given to the remaining deformation of the foundation soil, as well as the impact of different forms of foundations and surrounding building foundations on settlement caused by correction.

4. The building being corrected should have a certain overall stiffness. If the stiffness cannot meet the correction requirements, temporary reinforcement should be carried out first.

Secondly, the method of correcting the deviation of the house:

1. Pile driving and soil excavation correction method

The method of pile driving and soil excavation correction involves using anchor rod static pressure pile method to first press the pile on the side of the building with large settlement, and immediately anchor the pile to the foundation to stop the building from sinking further. Then, soil excavation is carried out on the side of the foundation with small settlement to reduce the pressure bearing area under the foundation bottom, increase the stress in the foundation on the excavation side, and achieve plastic deformation of the foundation, causing the building to slowly and uniformly sink and tilt back.

2. Lifting correction method

Lifting correction is achieved through the structural support and reinforcement technology of reinforced concrete or masonry, which separates the foundation and upper structure of a building along a specific position, uses reinforced concrete for reinforcement, segmented support, and forms a fully enclosed lifting support beam (column) system. Set up several support points that can support the entire building, and by activating the lifting equipment at these support points, the building can rotate in a plane along a certain line (point) to correct the tilting of the building. If the top height of each support point is significantly adjusted, the elevation of the building can be raised.