Drainage cast-in-situ concrete thin-wall pipe pile construction method

Abstract

The invention relates to a drainage cast-in-situ concrete thin-wall pipe pile construction method. The method comprises the following steps: preparing before construction, paving solidified soil, driving a sinking steel pipeline and a pile casing, mounting a precast reinforced concrete sleeve, pouring concrete in a pile body, vibrating and drawing the pipeline, filling the pile top, pre-burying connecting screw rods and a water drainage pipe, and mounting a pile top precast cover plate. According to the method, mechanical properties of the upper part of the pile body and a soil body around the pile body are improved, the effect that pile groups compact soil is relieved, the consolidation settlement amount caused by the change of underground water level in foundation soil and other reasons is reduced, and better technical and economic benefits are realized.

Description

technical field [0001] The invention relates to a cast-in-place thin-wall pipe pile, in particular to a construction method of a drainage type cast-in-place concrete thin-wall pipe pile. The utility model belongs to the field of foundation treatment and is suitable for foundation treatment projects, especially for soft soil foundation treatment projects with shallow buried depth and small pile spacing. Background technique [0002] The technology of cast-in-place concrete thin-walled pipe piles absorbs the advantages of prestressed concrete pipe piles, vibratory sinking pipe piles and vibratory sinking formwork thin-wall cut-off walls, and pours concrete through double-layer steel immersed pipes to form large-diameter thin-walled pipe piles. It has the economic and technical benefits of high single pile bearing capacity and relatively low cost, and has been widely used in soft soil foundation treatment projects in coastal areas such as Jiangsu and Zhejiang. [0003] However...

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Problems solved by technology

[0003] However, in the actual construction process, since the cast-in-place concrete thin-walled pipe piles belong to the soil-squeezing pile type, the setting of adjacent pile sinking pipes and the movement of the pile driver will have adverse effects on the concrete piles that have not yet initially set. Even if the construction plan is optimized in terms of sequence, device penetration, etc., there will still be pile body deviation in the pile top area, or broken piles, pile concrete segregation, weak interlayer and other diseases, which will seriously affect the pile quality of cast-in-place thin-walled pipe piles and bearing capacity; and the soft soil around the cast-in-place thin-walled pipe piles is prone to consolidation settlement caused by overlying loads and groundwater level changes, resulting in large negative friction resistance, reducing the bearing capacity of the pile and increasing post-construction settlement

[0004] There is a thin-walled tubular pile, which comprises a concrete pile body with a circular cross section, a reinforcement cage arranged in the concrete pile body, and an end plate and a hoop fixed at the end of the concrete pile body, Although this type of pile has a simple structure, it can also restrain the deformation of the pile tip to a certain extent, but since the constraint is only set at the pile tip, it is difficult to effectively solve the problem of mutual extrusion deformation and damage between the pile bodies

[0005] To sum up, cast-in-place thin-walled pipe piles have the advantages of strong applicability, high bearing capacity, and good bending resistance. However, due to the large diameter and thin pipe wall of the pipe pile, some quality problems are likely to occur during construction, resulting in pile failure. It is difficult to effectively exert the bearing capacity of the body, which seriously affects the quality of the pile body and the effect of foundation treatment

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