Post-grouting gravel pile with sand wall wing plates and construction method

Abstract

The invention relates to a post-grouting gravel pile with sand wall wing plates. The post-grouting gravel pile with the sand wall wing plates is characterized by mainly comprising a grouting gravel pile, a plurality of sets of sand wall wing plates and precast reinforced concrete pile tips, wherein the sand wall wing plates are uniformly distributed along the ring direction of the grouting gravel pile and are connected with the grouting gravel pile to form a whole body, the top part of a pile body extends into a sound cushion layer, the precast reinforced concrete pile tips comprise a gravel pile tip and a sand wall pile tip and are respectively arranged at the bottoms of the gravel pile and a sand wall, a grouting pipe is preset in the middle of the grouting gravel pile body, and the bottom of the grouting pipe is connected with the precast pile tips. With the adoption of the post-grouting gravel pile, the performance of water drainage of a granular material during a prepressing period can be exerted, and the grout can also be grouted into the pile body by a grouting pipe according to the sedimentation condition to form a rigid composite pile type, thus increasing the effective reinforcing depth of a gravel pile foundation and realizing effective unification of a drainage consolidation method and a composite foundation method.

Description

technical field [0001] The invention relates to a post-grouting gravel pile with a sand wall wing plate and a construction method. The foundation reinforcement method can take into account the advantages of both the drainage consolidation method and the composite foundation method. It belongs to the field of foundation engineering and is suitable for foundation treatment of highways, municipalities, airports and dams in soft soil areas. Background technique [0002] There are many types of soft soil foundations in my country, which are widely distributed, and generally have the characteristics of high water content, high compressibility, low strength, and poor water permeability. Buildings built on soft soil foundations often have engineering problems such as excessive total settlement, obvious differential settlement, excessive later settlement, and insufficient bearing capacity, which affect the normal use and safety performance of the building. In this regard, in order t...

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Problems solved by technology

The crushed stone pile has the advantages of simple construction, low cost, and short reinforcement period, and has become one of the commonly used composite foundation reinforcement methods for civil engineering construction in soft soil areas. Depth is usually less than 20m

Although this kind of design can achieve relatively good engineering results under suitable engineering background and geological conditions, this kind of reinforcement method involves two different types of foundation treatment methods: composite foundation, bagged sand well or plastic drainage board. The organization is difficult, and the project cost is high; at the same time, the vertical drainage body is set between the piles of the composite foundation, and the distance between them is relatively large, which does not meet the "thin and dense" design principle of the vertical drainage channel, and its drainage reinforcement effect is relatively limited

[0006] At present, there is a method of building a vertical drainage body in the foundation. In this method, lateral drainage pipes are arranged on the vertical drainage pipes, so that the drainage path of the foundation soil is greatly improved. shortening, the drainage direction changes from the traditional single to three-dimensional, and at the same time, it can achieve the purpose of uniform drainage of foundation soil consolidation and uniform improvement of foundation bearing capacity, but this method only has the purpose of accelerating soil consolidation

[0007] In summary, the existing composite foundation reinforcement methods are difficult to effectively solve the problem of soil consolidation between piles and the multiple utilization of pile materials. Although the vertical drainage body in the soil can accelerate the consolidation of the soil between the piles to a certain extent, due to its single drainage direction, relatively long drainage path, and the existence of smear or well resistance effects

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