Underwater anti-sliding cast-in-situ bored pile foundation and construction method thereof

Abstract

The invention discloses an underwater anti-sliding cast-in-situ bored pile foundation and a construction method thereof. The underwater anti-sliding cast-in-situ bored pile foundation is used for underwater soft soil slopes on river alluvial plains, river estuaries and continental shelves, and is formed by sequentially sealing and connecting at least one section of novel steel protection barrel and at least one section of common steel protection barrel from bottom to top. The novel steel protection barrel comprises an inner barrel, an outer barrel and an automatic hole pressure adjusting system, through holes are evenly distributed in the barrel wall of the outer barrel in the circumferential direction, and the through holes are located in an underwater soft soil layer. According to the underwater anti-sliding cast-in-situ bored pile foundation and the construction method thereof, the pore water pressure in peripheral soil can be automatically adjusted at the construction stage and theoperation stage of the underwater anti-sliding cast-in-situ bored pile foundation; when penetration of the steel protection barrel in the construction process is difficult, pressurized water injection is carried out in a cavity of the novel steel protection barrel, the peripheral soil is softened, the penetration resistance of the steel protection barrel is reduced, and the mounting efficiency isimproved; and when the super-static pore water pressure in the operation process exceeds a pore water pressure prewarning value capable of causing soil shear failure, an alarm gives an alarm, and a water pump is started to draw water.

Description

technical field [0001] The invention relates to the technical field of underwater bored pile foundations, in particular to an underwater anti-skid bored pile foundation and a construction method thereof. Background technique [0002] With the rapid advancement of my country's urbanization process, a large number of cross-river / river bridges, sea-crossing bridges, river / river roads, coastal roads, and a series of water (river / river or sea) viewing platforms and other engineering projects have emerged. Pile-like foundations (especially underwater bored pile foundations) have played an important role in the smooth construction and normal operation of the above-mentioned projects. [0003] Weak soils with large porosity, low shear strength, high sensitivity, and easily disturbed are widely distributed on the alluvial plains of rivers, river estuaries, and continental shelves, and underwater soft soil slopes are formed in areas extending from land to rivers and oceans. When const...

AI Technical Summary

Problems solved by technology

In fact, under the action of construction load, wave load, vibration of the structure itself and its upper working load, storm surge, earthquake and other natural disasters, not only the microstructure of the underwater soft soil will be destroyed and the strength softened after the disturbance, but also the The excess static pore water pressure gradually forms in the soft soil layer around the foundation of the underwater bored pile. According to the principle of effective stress, the effective stress will decrease with the increase of the pore water pressure in the soft soil layer, resulting in the deformation of the soil. The shear strength also decreases accordingly, which may cause landslides on underwater soft soil slopes, and then induce slippage or fracture of the foundation of underwater bored piles, and even cause damage to the foundation of underwater bored piles and its superstructure. Overall overturning and destruction, which may cause casualties and huge property losses

Images