Gravel pile with consolidated sand layer and reinforced concrete pipe joint, and construction method thereof

Abstract

The invention relates to the field of foundation treatment, which is particularly applicable to soft soil foundation treatment engineering. The invention especially relates to a gravel pile with a consolidated sand layer and a reinforced concrete pipe joint, and a construction method thereof. The gravel pile comprises a central pile body, wherein the consolidated sand layer used for improving theintegrality of the pile body is arranged at the outer side of the central pile body; and a protection layer with a protection function is arranged at the outer side of the consolidated sand layer, andcapable of effectively preventing grout from excessively permeating into the sand layer, thereby reducing the waste of construction materials; a pile foundation is good in forming effect, high in bearing performance, and capable of greatly improving the bearing capacity of foundation soil; with the adoption of the gravel pile with the consolidated sand layer and the reinforced concrete pipe joint, the bearing performance of the sand layer can be exerted, and the side friction of the pile body is improved; and meanwhile, due to the arrangement of the reinforced concrete pipe joint, constrainteffect can be acted on gravels to a certain extent, so that the effect of improving the integrality of the pile body is acted, and due to the arrangement of a pile end grout solid and a pile peripherygrout solid, the bearing performance of the pile foundation can be improved.

Description

technical field [0001] The invention relates to the field of foundation treatment, and is particularly suitable for soft soil foundation treatment projects, in particular to a consolidated sand-layer reinforced concrete pipe-jointed gravel pile and a construction method thereof. Background technique [0002] The foundations in coastal areas are characterized by high water content, and most of them are soft soil foundations. The sand layer of some foundations can be as thick as 3-5m or even thicker. Therefore, before constructing the geotechnical structure on the soft soil foundation, the foundation needs to be treated. In the engineering field, gravel piles are often used for soft soil foundation treatment. There are three kinds of construction methods similar to this patent in the current crushed stone pile construction method, namely traditional crushed stone grouting pile, cloth bag crushed stone grouting pile, cloth bag concrete tube crushed stone grouting pile etc. [...

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Problems solved by technology

However, this method makes it inconvenient to press the pipe pile after the geotextile bag is inserted during construction. The geotextile bag is easily damaged during pile pressing, which makes it impossible to sink with the pipe pile, so that the effect of preventing the blockage of the permeable hole cannot be achieved. Reduce the drainage effect of the pile body; if there is a sand layer in the foundation, the mortar will excessively infiltrate into the surrounding sand layer through the damaged cloth bag, resulting in a serious waste of materials; at the same time, this method has a preloading period, and the construction period is longer; Most of the woven bags are used, and the surface is relatively smooth, resulting in small side friction of the pile and low bearing capacity of the pile. Therefore, this technology has poor economic benefits and cannot solve the above problems well.

[0007] To sum up, the improvement for the construction of the foundation in the coastal area or within the port range, which is a relatively special construction environment, can improve the effect to a certain extent, but the cement slurry in the construction process is excessively to the sand layer. Problems such as internal penetration and poor bearing performance of the pile foundation after construction are still not well resolved. Obviously, the existing gravel piles cannot meet the engineering needs more effectively.

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