Construction method of in-tube grouting, extrusion and expansion root-fixed pile

A construction method and a technology of grouting in pipes, which are applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of reducing vertical bearing capacity, crushing of pile foundations, and consuming more concrete, etc., to improve the soil layer at pile ends Bearing capacity, improvement of pile tip bearing capacity, and wide range of soil applicability effects

CN111172971APending Publication Date: 2020-05-19周同和
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-05-19

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Abstract

The invention relates to the technical field of geotechnical engineering and discloses a construction method of an in-tube grouting, extrusion and expansion root-fixed pile. The construction method comprises the following steps of: (1) at the position of the pile, taking away soil by using a drilling machine to form a guide hole; (2) drilling into the bottom elevation position of the guide hole byusing the drilling machine, and pumping grouting material into the guide hole and simultaneously lifting the drilling machine in the pumping process; and (3) implanting a precast pile into the guidehole and pressing the precast pile to the bottom elevation position of the pile, wherein the distance from the bottom elevation of the precast pile to the bottom elevation of the guide hole is smallerthan or equal to 1 / 10 of the depth of the grouting material in the guide hole; the pile end of the precast pile is fixedly connected with a closed type pile tip; when the precast pile is pressed to the bottom elevation of the pile, and a part of the grouting material in the guide hole is extruded into the surrounding soil body at the bottom of the guide hole so as to form a pile end root fixed body. The construction method provided by the invention can increase the bearing capacity of the pile end; the bearing capacity of the pile end is increased by more than 40% in comparison with the bearing capacity of a cast-in-place bored pile with the same diameter; and meanwhile, the compression bearing capacity and the pressure uplift bearing capacity of the pile body can also be increased.
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Description

technical field

[0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a construction method for grouting in pipes to squeeze and expand root-fixed piles. Background technique

[0002] With the development of the construction industry, the scale of the building is increasing day by day, and the additional load on the foundation is increasing. For some high-rise and super high-rise buildings, the natural foundation and composite foundation can no longer meet the requirements of the foundation bearing capacity. Under this condition, the pile foundation It is a commonly used basic form. For some areas where the engineering property of the upper soil layer of the pile foundation is better than that of the lower soil layer of the pile body, the pile foundation generally adopts increasing the pile length to penetrate the weak layer or increasing the pile diameter to increase the lateral resistance to ensure the bearing capacit...

Examples

Embodiment 1

[0030] A construction method for grouting in pipes to squeeze and expand root-fixed piles, such as figure 1 shown, including the following steps:

[0031] (1) At the pile position, use an auger drill to take soil to form an approach hole with a diameter of 600mm and a depth of 12m;

[0032] (2) After the auger drill drills to the bottom elevation of the pilot hole, pump the grouting material into the pilot hole through the pipeline, and lift the drilling rig at the same time. The depth of the grouting material in the pilot hole is 0.3 times the depth of the pilot hole (that is, the The depth of the grouting material is 3.6m), the grouting material is cement mortar mixture, the cement mortar mixture is composed of the following raw materials: cement 15 wt%, sand 60 wt%, fly ash 5wt%, water 15 wt%, Additive 5 wt% (the additive is made by mixing water reducer and retarder at a mass ratio of 1:1); the strength of cement mortar mixture is not less than 15Mpa;

[0033] (3) Implant...

Embodiment 2

[0035] A construction method for grouting in pipes to squeeze and expand root-fixed piles, such as figure 1 shown, including the following steps:

[0036] (1) At the pile position, use an auger drill to take soil to form an approach hole with a diameter of 750mm and a depth of 16m;

[0037](2) After the auger drilling rig reaches the bottom elevation of the pilot hole, pump the grouting material into the pilot hole through the pipeline, and lift the drilling rig at the same time. The depth of the grouting material in the pilot hole is 0.5 times the depth of the pilot hole (that is, the The depth of the grouting material is 8m), the grouting material is cement mortar mixture, the cement mortar mixture is composed of the following raw materials: cement 12wt%, sand 65wt%, fly ash 5wt%, water 15wt%, water reducer 3wt%; the strength of the cement mortar mixture is not less than 15Mpa;

[0038] (3) Implant prefabricated piles into the lead holes, the prefabricated piles are PHC pi...