Prevention method for soft soil foundation settlement caused by open caisson manufacturing

[0031] Such as figure 1 with 2 As shown, a method for preventing and controlling soft soil foundation settlement caused by caisson manufacturing is characterized in that: comprising the following steps:

[0032] (a) Increase the frictional resistance of caisson 1 wall;

[0033] (b) The construction of the top structure of caisson 1 is postponed. After the shell of caisson 1 sinks and stabilizes, the construction of the top structure of caisson 1 will be completed together according to the measured elevation;

[0034] (c) Enlarging the bottom area of ​​the caisson 1 and increasing the width of the annular blade foot 4;

[0035] (d) Add a cross beam 2 at the bottom of the caisson 1 to prevent damage to the edge of the caisson 1 due to uneven stress during the sinking process.

[0036] In the step (a), in the process of making the caisson 1, in order to increase the frictional resistance of the caisson 1 wall, the earthwork can be excavated to -5m and then start to make the caiss

[0042] (1) Obtain the soil layer distribution and bearing capacity of the area where the caisson is located through the geological survey report; according to the characteristic value of the bearing capacity of each soil layer, judge the stability of the caisson during fabrication; if the stability cannot be maintained, take the following measures;

[0043] (2) Take technical measures to increase the friction resistance of the caisson wall. During the production process, the earthwork can be excavated to -5m and then the caisson will be made. After the caisson wall height exceeds 5m, the earthwork layering will be carried out on the outside of the caisson. backfill compaction;

[0044] (3) Delay the construction of the top structure of caisson 1; taking the swirl pool as an example, in order to meet the elevation control requirements and achieve the purpose of reducing the self-weight, the construction of the upper 3m of the outer wall of the swirl sedimentation tank can be postpo