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Water-rich sand layer deep foundation pit underwater construction method
The invention discloses a water-rich sand layer deep foundation pit underwater construction method. A row of continuous walls is arranged around a pre-excavated foundation pit, a crown beam is arranged at the top of the continuous walls, and concrete supports are erected among the continuous walls. The method includes the following steps that the foundation pit among the continuous walls is excavated to reach the preset depth, and water is poured into the foundation pit to reach the position below the concrete supports; a hole is drilled in the bottom of the foundation pit in the vertical direction, an uplift pile steel framework is put in the hole, a bottom-sealed plate steel framework is put in the preset position of the foundation pit in the horizontal direction, and the bottom-sealed plate steel framework, the uplift pile steel framework and the continuous walls are fixed separately; underwater pouring of uplift pile holes and the bottom-sealed plate steel framework is performed; and grout in the foundation pit is drained, and a plurality of steel supports are erected in the foundation pit along different heights to reach the bottom of the foundation pit. By means of an underwater excavation mode, water pressure of inside and outside of the pit can be mutually cancelled out, the construction danger of excavation of a deep foundation pit support structure is reduced, the built-in depth of the continuous walls can be reduced after a top sealing plate is arranged, and the cost is reduced.
Water-rich sand layer deep foundation pit underwater construction method
The invention discloses a water-rich sand layer deep foundation pit underwater construction method. A row of continuous walls is arranged around a pre-excavated foundation pit, a crown beam is arranged at the top of the continuous walls, and concrete supports are erected among the continuous walls. The method includes the following steps that the foundation pit among the continuous walls is excavated to reach the preset depth, and water is poured into the foundation pit to reach the position below the concrete supports; a hole is drilled in the bottom of the foundation pit in the vertical direction, an uplift pile steel framework is put in the hole, a bottom-sealed plate steel framework is put in the preset position of the foundation pit in the horizontal direction, and the bottom-sealed plate steel framework, the uplift pile steel framework and the continuous walls are fixed separately; underwater pouring of uplift pile holes and the bottom-sealed plate steel framework is performed; and grout in the foundation pit is drained, and a plurality of steel supports are erected in the foundation pit along different heights to reach the bottom of the foundation pit. By means of an underwater excavation mode, water pressure of inside and outside of the pit can be mutually cancelled out, the construction danger of excavation of a deep foundation pit support structure is reduced, the built-in depth of the continuous walls can be reduced after a top sealing plate is arranged, and the cost is reduced.
Water-rich sand layer deep foundation pit underwater construction method
ZHAI SHIHONG (author) / YANG ZHAO (author) / JIANG DAODONG (author) / LUO WEI (author) / YANG QING (author)
2016-01-13
Patent
Electronic Resource
English
IPC:
E02D
FOUNDATIONS
,
Gründungen
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