Combined type lattice form prefabricated pile wall support protecting structure and construction method thereof

Abstract

The invention discloses a combined type lattice form prefabricated pile wall support protecting structure. The combined type lattice form prefabricated pile wall support protecting structure comprisesa front-row pile wall, a back-row pile wall, middle pile walls, a platform plate and a buttress retaining wall, wherein the front-row pile wall and the back-row pile wall are front and back two rowsof parallel close-packed prefabricated prestress concrete hollow square piles, the middle pile walls are a plurality of rows of close-packed prefabricated prestress concrete hollow square piles vertically located between the front-row pile wall and the back-row pile wall, and cavities of the prefabricated prestress concrete hollow square piles are internally provided with cast-in-place steel bar concrete filling cores. Accordingly, an inventor further establishes a corresponding construction method. By means of the combined type lattice form prefabricated pile wall support protecting structureand the construction method thereof, the defects of the insufficient rigidity and bearing capacity of prefabricated support protecting piles used in deep foundation pit high slopes are overcome, a new solution scheme capable of performing construction rapidly is provided for foundation pit support protecting without support and anchor requirements, the combined type lattice form prefabricated pile wall support protecting structure has the characteristics of saving the construction period, saving the cost and having neat and attractive structural surfaces, and a water-stopping earth-retainingsupport protecting structural system of the combined type lattice form prefabricated pile wall support protecting structure and the construction method thereof is suitable for soft soil foundation foundation-pit projects and road slope and wharf revetment support protecting projects.

Description

technical field [0001] The invention belongs to the technical field of support structures in geotechnical engineering, and in particular relates to a combined lattice configuration prefabricated pile wall support structure and a construction method thereof. Background technique [0002] In order to solve the support problem of large deep foundation pit engineering in soft soil areas without internal support requirements, the Chinese patent "Lattice Underground Wall Self-supporting Wall Protection Structure" (application number 200510027744.3 publication date 2007-01-17) consists of several T-shaped arrangements The inner and outer ground connecting walls are connected one by one by perforated steel plates and the in-line middle underground wall to form a grid-shaped underground continuous wall with huge rigidity. The self-supporting retaining wall structure uses the huge lateral stiffness of its own lattice structure to resist the bending moment generated by the huge lateral...

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Problems solved by technology

[0003] (1) In the soft soil area, the construction of the ground connection wall into a groove is easy to collapse the hole, and often requires additional reinforcement of the groove wall (usually using stirring piles and jet grouting piles), mud retaining wall and subsequent mud treatment, and the mud retaining wall may be damaged during construction. Pollution of groundwater, higher additional costs

[0004] (2) Due to the mechanical construction technology of the trough forming of the ground connection wall, the width of the trough is generally not less than 2m, and the wall thickness is not less than 0.6m, so the planar size of the lattice-shaped underground wall support structure composed of the ground connection wall is large (the structure width is usually greater than 6m), the flexibility of the combination method is poor, and it will cause unnecessary waste for foundation pits that require less rigid support

However, due to the convenience of production, handling, transportation and construction conditions, the length of the prefabricated prestressed concrete hollow square pile is relatively short (generally no more than 15m), and the cross-sectional size is small (side length is 400mm-800mm). The bending resistance and shear resistance are low, so its application in the deep foundation pit support and retaining wall usually requires the installation of internal support or anchor structure, which cannot be applied to deep foundation pit projects with large depth of foundation pit without support and anchor requirements

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