Open caisson construction method suitable for silt soft soil foundation and high underground water level

Abstract

The invention relates to an open caisson construction method suitable for the slit soft soil foundation and the high underground water level. An open caisson adopts a circular open caisson, and the construction steps are as follows: S1, measuring and positioning are carried out; S2, basic leveling and tamping are carried out; S3, a waterproof curtain is built; S4, cement mixing pile support is built; S5, open caisson blade feet and the well wall are built on the cement mixing pile support; S6, open caisson sinking is carried out, cement stirring pile support is cut off segment by segment in the sinking process and dug out, and the open caisson gradually sinks; and S7, bottom sealing is carried out, when the sinking well sinks to the height which is 0.1 m higher than the designed elevation,soil digging and water pumping in the well are stopped, the sinking well is enabled to sink to or approach the designed elevation under the action of the dead weight, and after sinking and stabilizing, open caisson bottom sealing can be carried out. According to the open caisson construction method suitable for the slit soft soil foundation and the high underground water level, the waterproof curtain and the cement stirring pile support are built, the eccentric and uneven settlement of the open caisson can be prevented, the pressure of the lateral slit soft soil is resisted, and collapse anda large amount of water inrush are prevented.

Description

technical field [0001] The invention belongs to the field of bridge foundation technology or underground structures, and relates to the construction technology of caissons, in particular to a construction method of caissons suitable for muddy soft soil foundation and high groundwater level. Background technique [0002] The caisson is generally used as a supporting structure for the construction of auxiliary underground structures or as an underground permanent building. It is mostly used in places with poor foundation bearing capacity and high groundwater level. With the development of society, in order to meet people's development needs, the country has new requirements for land utilization. Some places with weak foundation bearing capacity and high groundwater level now need to build foundations for some large building structures. This poses new challenges to underground engineering or large-scale foundation pit construction measures and technologies. When the caisson is...

AI Technical Summary

Problems solved by technology

When the caisson is constructed in high water level and muddy soil, it is not easy to control the verticality and drainage problems

When the caisson sinks in a soft soil layer such as a deep silt layer, the excavation speed of the soil in the well is too fast. When the difference in soil pressure inside and outside the well is large, the soil outside the well is easy to flow into the well from the underground, and the caisson will suddenly sink. other construction problems

[0003] No technical solution similar to this patent was found after searching the prior art

Images