Three-dimensional-drainage precast reinforced concrete pile and construction method

Abstract

The invention discloses a three-dimensional-drainage precast reinforced concrete pile and a construction method. The three-dimensional-drainage precast reinforced concrete pile comprises a precast reinforced concrete pile body, at least one vertical drainage groove, at least one vertical drainage body, 2 to 5 horizontal ring-direction drainage grooves and 2 to 5 horizontal ring-direction drainage bodies. The precast reinforced concrete pile body comprises a class-A pile main body, a class-B pile main body and a class-C pile main body. The vertical drainage grooves are formed in the side faces of the class-A pile main body, the class-B pile main body and the class-C pile main body. The vertical drainage bodies are arranged in the vertical drainage grooves. The ring-direction drainage grooves are formed in the side face of the class-C pile main body. The ring-direction drainage bodies are arranged in the ring-direction drainage grooves. The three classes of main pile bodies are combined, driven and spliced according to geological survey data, lap joint is conducted on the drainage bodies at the pile slicing positions so that continuous vertical drainage bodies distributed along the full length of the pile body can be formed, and a three-dimensional drainage system is formed by the vertical drainage bodies and the horizontal ring-direction drainage bodies. The three-dimensional-drainage precast reinforced concrete pile and the construction method have the beneficial effects that the excess pore water pressure generated in the pile sinking process can be effectively reduced, the after-construction consolidation settlement is reduced, meanwhile, under the effect of earthquakes, the excess pore pressure accumulation of a soil body around the pile can be effectively reduced, and earthquake damage caused by foundation liquidation is prevented.

Description

technical field [0001] The invention belongs to the technical field of anti-seismic engineering of geotechnical engineering, and particularly relates to a prefabricated reinforced concrete pile with three-dimensional drainage and a construction method. Background technique [0002] my country is located at the intersection of the two seismic belts in the world, the Pacific Rim Seismic Belt and the Eurasian Seismic Belt. It is a country with frequent earthquakes. In recent years, from Wenchuan County in Sichuan Province, Yushu County in Yushu Tibetan Autonomous Prefecture in Qinghai Province to Ludian in Yunnan Province, the liquefaction phenomenon of the foundation soil layer (sand soil) can be found, causing foundation damage, which in turn leads to a large number of earthquakes. The collapse of the structure has caused great losses to the lives and properties of the Chinese people. Therefore, the seismic design of the structure foundation is particularly important. [00...

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Problems solved by technology

[0004] For the application of pile foundations in anti-seismic aspects, gravel piles are mainly used to form vertical drainage channels to resist the liquefaction of foundation soil in engineering, but gravel piles have the disadvantages of relatively low bearing capacity and weak settlement control ability, which limit the The scope of application of stone piles

[0005] Before the present invention, the Chinese patent "Scattered Pile-Permeable Concrete Pile Binary Composite Foundation and Treatment Method" improved the gravel pile, which has both the water permeability of the bulk pile and the high water permeability of the permeable concrete pile. The compressive strength improves the vertical bearing capacity of the foundation, but the permeable concrete pile is a plain concrete pile, which has a low shear strength, so it is difficult to apply it to the seismic design of the liquefied soil foundation; Drainage piles mainly collect water into the drainage channel inside the pile through the permeable concrete at the pile end or side, and then pump the water out through a vacuum pump. These methods not only increase the cost, but also do not consider the drainage channel of the drainage pile. Forming a three-dimensional drainage system cannot achieve the purpose of quickly eliminating the excess pore water pressure generated during the earthquake

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