Super-large planar area partially prestressed concrete open caisson foundation and construction method thereof

Abstract

The invention discloses a super-large planar area partially prestressed concrete open caisson foundation and a construction method thereof. The super-large planar area partially prestressed concrete open caisson foundation comprises a lower initial partially prestressed concrete open caisson section and a jointing partially prestressed concrete or common reinforced concrete open caisson section above the initial partially prestressed concrete open caisson section, wherein the initial partially prestressed concrete open caisson section (1) is in a partially prestressed concrete structure, a partially prestressed 'crossed' beam is formed on longitudinal and transverse internal partition walls with prestressed steel wire bundles, and the partially prestressed 'crossed' beam and an identicallyprestressed caisson wall can form a partially prestressed concrete 'beam lattice' capable of effectively resisting complex stress conditions; the initial partially prestressed concrete open caisson section is sunk down to a designated position, and then every subsequent standard section is sequentially jointed and sunk down to the designated position until final sinking is completed. The super-large planar area partially prestressed concrete open caisson foundation and the construction method thereof can improve the structural safety and the anti-cracking performance of an open caisson sunk through pot-like excavating and sinking, thereby being particularly applicable to large rectangular, round, elliptical and end-circular open caisson foundations of 4000-10000 m2.

Description

technical field [0001] The invention relates to the technical field of large bridge foundation structures, in particular to a partially prestressed concrete caisson foundation with a super large plane area and a construction method thereof. Background technique [0002] At present, caissons commonly used in engineering include steel caissons, steel shell concrete, and low-grade reinforced concrete caissons, etc. For the foundation of large bridge caissons, with the increase of the plane area of ​​caissons, the influence of unevenness of the foundation soil under the caissons It is more and more obvious that the stress is complicated during the construction process, and problems such as cracking increase significantly. If the foundation of a large caisson is excavated and sunk using the traditional “big pot bottom”, due to its small relative height and small vertical bending stiffness (this effect is exacerbated by the huge plane size of the large caisson), the structure of t...

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Problems solved by technology

[0002] At present, caissons commonly used in engineering include steel caissons, steel shell concrete, and low-grade reinforced concrete caissons, etc. For the foundation of large bridge caissons, with the increase of the plane area of ​​caissons, the influence of unevenness of the foundation soil under the caissons More and more obvious, the stress is complicated during the construction process, and problems such as cracking increase significantly

If the foundation of a large caisson is excavated and sunk using the traditional “big pot bottom”, due to its small relative height and small vertical bending stiffness (this effect is exacerbated by the huge plane size of the large caisson), the structure of the caisson Under the action of self-weight, the concrete structure at the bottom of the partition wall is under great stress, and large-scale cracking will occur, which will endanger the safety of the caisson structure and affect its durability

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