Construction method for adding pile foundation in existing building

Abstract

The invention relates to the technical field of building reinforcement, in particular to a construction method for adding a pile foundation in an existing building, which comprises the following steps: S1, a site is leveled, and floor tiles are removed; S2, stress dissipation holes are formed, soil-squeezing buffer ditches are excavated, and coarse sand is backfilled; S3, a prefabricated concrete pipe pile is conveyed to the pile position for pile pressing; S4, when the pressure value reaches two times of the final pressure value of pile pressing and the designed single-pile bearing capacity characteristic value, and the pile length of the sunk pile is basically matched with the situation reflected by the pile position geological data of the corresponding position, pile pressing is stopped; S5, re-pressing is conducted, settlement observation is conducted, and whether the pile body bearing capacity meets the design requirement or not is checked; S6, the stress dissipation holes and the soil squeezing buffer ditches are backfilled; S7, a ground beam foundation trench is excavated, specifically, steel bars are planted on an original bearing platform beam of the existing building, and rectangular columns and embedded components are constructed on the ground beam foundation trench; and S8, the ground beam and a ground beam plate are poured by using concrete. The method has the effect of preventing secondary settlement of the existing building.

Description

technical field [0001] The invention relates to the technical field of building reinforcement, in particular to a construction method for adding pile foundations inside an existing building. Background technique [0002] Many construction sites in my country's coastal areas are located in areas where silty soft soil develops on the plain coast. During construction, the treatment of the deep and weak soil layer under the indoor floor of buildings such as large-span and large-area storage and factory buildings that is not used as the basic bearing layer is often neglected, and a little treatment is directly carried out on the soft soil layer and then according to construction practices The construction ground, and the weak soil layer under the ground is difficult to complete self-weight consolidation for a long time, resulting in uneven settlement and subsidence of the ground after the building is put into use, seriously affecting the building itself and the internal equipment...

AI Technical Summary

Problems solved by technology

These methods either have a long construction period or high cost, and secondary settlement may still occur after the reinforcement is completed, and the effect cannot fully meet the owner's requirements

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