CN113981953A - Steel pipe stirring composite pile and construction method thereof - Google Patents
Steel pipe stirring composite pile and construction method thereof Download PDFInfo
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- CN113981953A CN113981953A CN202111182055.5A CN202111182055A CN113981953A CN 113981953 A CN113981953 A CN 113981953A CN 202111182055 A CN202111182055 A CN 202111182055A CN 113981953 A CN113981953 A CN 113981953A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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Abstract
本发明公开了一种钢管搅拌复合桩及其施工方法，属于地基处理技术领域。施工方法具体包括：步骤一、桩机定位：移动桩机到达指定位置，调整桩机的垂直度；步骤二、搅拌喷料下钻：启动桩机，将钢管搅拌芯向下旋转钻进地基，同时钢管搅拌芯喷射水泥浆；步骤三、成桩：钢管搅拌芯旋转至桩底后，将钢管搅拌芯从桩机上拆除。本发明利用了钢管搅拌芯的结构特征，在钢管搅拌芯下沉切土的同时进行水泥浆的喷射和搅拌，能够三步成桩，节省了传统复合桩施工时的压桩步骤，施工效率较快，弥补了传统桩型施工流程繁琐的缺点。且本发明的复合桩具有受力结构好、承载力高、质量稳定、施工效率高和施工流程简单的特点。
The invention discloses a steel pipe stirring composite pile and a construction method thereof, belonging to the technical field of foundation treatment. The construction method specifically includes: step 1, positioning of the pile driver: moving the pile driver to a designated position, and adjusting the verticality of the pile driver; step 2, stirring and spraying material to drill down: start the pile driver, rotate the steel pipe stirring core downward and drill into the foundation, At the same time, the steel pipe stirring core is sprayed with cement slurry; step 3, forming a pile: after the steel pipe stirring core is rotated to the bottom of the pile, the steel pipe stirring core is removed from the pile driver. The invention utilizes the structural characteristics of the steel pipe stirring core, and the cement slurry is sprayed and stirred while the steel pipe stirring core sinks and cuts the soil. Fast, make up for the shortcomings of the traditional pile construction process is cumbersome. And the composite pile of the present invention has the characteristics of good stress structure, high bearing capacity, stable quality, high construction efficiency and simple construction process.
Description
Technical Field
The invention belongs to the technical field of foundation treatment, and particularly relates to a steel pipe stirring composite pile and a construction method thereof.
Background
Soft soil is widely distributed in the southeast coastal region of China, and the problem of soft soil foundation treatment is inevitable when various engineering constructions are carried out. The treatment of soft soil foundations has become one of the important factors affecting construction period, project quality and construction cost.
At present, the soft soil foundation treatment technology has some defects, such as: the pile forming quality is unstable, the reinforcing depth is limited, the treatment effect is unstable, the pile strength is low, the construction automation control degree is low, the influence on the environment is large, the manufacturing cost and the management cost are high, and the like.
Through retrieval, relevant patents are disclosed at present for solving the defects of unstable pile forming quality and the like of the existing composite pile construction method. For example, the Chinese patent application number is: CN201810943268.7, filed as follows: the invention patent of 2018, 8 and 17 discloses a construction method of a composite stiff pile, which comprises the following steps: step one, adopting a rotary stirring mechanism to stir soil within a preset range to obtain a cement soil pile; step two, adopting a spiral drilling machine to carry out hole taking and grouting on the cement soil pile to form a cement soil composite pile; and thirdly, pressing a plurality of rigid piles into the cement-soil composite pile by using a pile driver to obtain the composite strong pile. Although the method ensures the concentricity of the peripheral pile and the rigid pile and improves the stability of pile forming quality, the method needs to obtain the cement-soil composite pile first and then press the rigid pile into the cement-soil composite pile to obtain the composite stiff pile, and has the disadvantages of complicated construction method and slow construction efficiency.
Disclosure of Invention
Aiming at the problems of more complicated construction method and lower construction efficiency of the existing composite pile, the invention provides the steel pipe stirring composite pile and the construction method thereof, which correspondingly improve the structure of the steel pipe stirring core, simplify the construction method, have a three-step pile forming technology and make up the defect of complicated traditional pile type construction process.
In order to solve the above problems, the present invention adopts the following technical solutions.
A construction method of a steel pipe stirring composite pile comprises the following steps:
step one, pile machine positioning: moving the pile driver to an appointed position, and adjusting the verticality of the pile driver;
step two, stirring, spraying and drilling: starting the pile machine, drilling the steel pipe stirring core into the foundation in a downward rotating mode, and spraying cement slurry to the steel pipe stirring core at the same time;
step three, forming a pile: and after the steel pipe stirring core rotates to the bottom of the pile, the steel pipe stirring core is detached from the pile machine.
The steel pipe stirring core is used as a stirring shaft, the top of the steel pipe stirring core is provided with an expansion head, cement paste is filled in the expansion head, the bottom of the steel pipe stirring core is provided with a paste outlet, the steel pipe stirring core is sprayed with the cement paste while sinking and cutting soil for stirring, after the cement paste is cooled and formed, the steel pipe stirring cement soil composite pile is formed, and the pile can be formed by three steps, so that the construction method is simplified.
According to a further technical scheme, in the step one, the steel pipe stirring core is detachably mounted on a motor of the pile machine, and the perpendicularity error of the steel pipe stirring core is smaller than 1%.
The further technical scheme comprises the following steps of: and after the cement paste is cooled, cleaning cement soil on the top of the steel pipe stirring core.
A steel pipe stirring composite pile comprises a steel pipe stirring core, wherein an expansion head is arranged at the top of the steel pipe stirring core, and cement or concrete is filled in the expansion head; the bottom of the steel pipe stirring core is provided with a plurality of slurry outlets. The vertical bearing capacity is enhanced through the steel pipe stirring core and the expanding head.
According to the further technical scheme, the plurality of grout outlets are distributed at equal intervals along the peripheral direction of the steel pipe stirring core, so that the cement grout is uniformly sprayed.
Further technical scheme, along the length direction of steel pipe stirring core, be equipped with spiral stirring fin in the periphery of steel pipe stirring core, spiral stirring fin is used for stirring grout, strengthens the cohesiveness of steel pipe stirring core and grout, simultaneously, can further improve composite pile's bearing capacity.
Further technical scheme is equipped with a plurality of stirring wings in the bottom of steel pipe stirring core, and every stirring wing average level sets up, and the stirring wing is used for stirring grout, further strengthens the cohesiveness of steel pipe stirring core and grout.
According to a further technical scheme, the stirring wings comprise a first horizontal stirring wing, a second horizontal stirring wing and a third horizontal stirring wing, and the second horizontal stirring wing is positioned between the first horizontal stirring wing and the third horizontal stirring wing; the first horizontal stirring wing and the third horizontal stirring wing are parallel; the second horizontal stirring wing is vertical to the first horizontal stirring wing or the third horizontal stirring wing. The grout outlet is positioned between the first horizontal stirring wing and the second horizontal stirring wing, so that the stirring wings can stir the grout conveniently.
According to the further technical scheme, the diameter of the expansion head is larger than that of the steel pipe stirring core, and cement slurry is filled in the expansion head.
According to the further technical scheme, the length of the steel pipe stirring core is matched with the depth of the foundation, the steel pipe stirring core can be selected according to different fields, and the application range is wide.
Compared with the prior art, the invention has the beneficial effects that:
(1) the composite pile has simple construction process, utilizes the special steel pipe stirring core, sprays cement slurry while sinking and cutting soil for stirring, has three-step pile forming technology, has higher construction efficiency, and overcomes the defect of complicated traditional pile type construction process.
(2) The composite pile of the invention is provided with the enlarged head at the upper part and the steel pipe stirring core inside, which can fully exert the capability of rigid materials and improve the vertical bearing capacity of the foundation.
(3) The steel pipe stirring core and the spiral stirring fins on the steel pipe stirring core of the composite pile can improve the horizontal bearing capacity; the spiral blade increases the bonding degree of the rigid body and the cement, optimizes the internal stress form, fully exerts the performance of the composite pile and makes up for the defect of low horizontal and vertical resistance of the traditional pile.
(4) The composite pile has the characteristics of good stress structure, high bearing capacity, stable quality, high construction efficiency and simple construction process, and has good economic benefit and certain application prospect.
Drawings
FIG. 1 is a flow chart of the construction of a composite pile according to the present invention;
FIG. 2 is a schematic structural view of a steel pipe stirring core according to the present invention;
FIG. 3 is a bottom view of the stirring core of a steel pipe according to the present invention.
The reference numbers in the figures denote: 1. a pile machine; 2. a soil body surface crust layer; 3. a soft soil layer; 4. a support layer; 5. a motor; 6. a steel pipe stirring core; 7. a head is expanded; 8. a helical mixing fin; 9. a third horizontal stirring wing; 10. a second horizontal stirring wing; 11. a first horizontal stirring wing; 12. and a pulp outlet.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
Example 1
A steel pipe stirring composite pile is shown in figures 2 and 3, a steel pipe stirring core 6 rotates and sinks to penetrate through a soil body surface hard shell layer 2, a soft soil layer 3 and a bearing layer 4 of a field in sequence, cement slurry is sprayed while the steel pipe stirring core 6 rotates and sinks, and the cement slurry is bonded outside the steel pipe stirring core 6 after being cooled to form the composite pile.
The diameter and the length of the steel pipe stirring core 6 are selected according to the horizontal bearing capacity, the vertical bearing capacity and the site conditions, and the equal sections and the variable sections can be manufactured according to different sites and different requirements. The bottom of the steel pipe stirring core 6 is provided with a lower drill, the shape of the lower drill can be selected according to different fields, and the preferred shape of the lower drill in the embodiment is a cone.
The top of the steel pipe stirring core 6 is provided with an expansion head 7, and cement paste or concrete is filled in the expansion head 7. The diameter of the expanded head 7 is larger than that of the steel pipe stirring core 6, and the diameter of the expanded head is about 2-3 times of that of the steel pipe stirring core 6. The inside cavity of steel pipe stirring core 6, a plurality of thick liquid mouths 12 have been seted up to its bottom, and a plurality of thick liquid mouths 12 are along the equidistant distribution of steel pipe stirring core 6's peripheral direction. And the material of enlarged footing 7 is steel, and the upper portion of composite pile has steel enlarged footing 7, and inside has steel pipe stirring core 6, can full play rigid material's ability, can improve the vertical bearing capacity of ground.
Along the length direction of the steel pipe stirring core 6, the spiral stirring fins 8 are arranged on the periphery of the steel pipe stirring core 6 and used for stirring cement paste when the cement paste is sprayed, the cohesiveness of the steel pipe stirring core 6 and the cement paste is enhanced, the internal stress form is optimized, and the performance of the composite pile is fully exerted. And, the helical mixing fin 8 can improve the horizontal bearing capacity of the composite pile.
In order to further enhance the cohesiveness of the cement paste and the steel pipe stirring core 6, a plurality of stirring wings are arranged at the bottom of the steel pipe stirring core 6, and each stirring wing is horizontally arranged and used for stirring the cement paste, so that the cement paste is uniformly cohered with the steel pipe stirring core 6. The distance between the stirring wings and the horizontal length of the stirring wings are determined according to the site conditions, and the shape and the length of the stirring wings are selected according to the site conditions.
This example provides a preferred embodiment: the stirring wings comprise a first horizontal stirring wing 11, a second horizontal stirring wing 10 and a third horizontal stirring wing 9, and the second horizontal stirring wing 10 is positioned between the first horizontal stirring wing 11 and the third horizontal stirring wing 9; the first horizontal stirring wing 11 and the third horizontal stirring wing 9 are parallel; the second horizontal stirring wing 10 is perpendicular to the first horizontal stirring wing 11 or the third horizontal stirring wing 9. And the grout outlet 12 is positioned between the first horizontal stirring wing 11 and the second horizontal stirring wing 10, so that the stirring wings can stir the grout conveniently.
Example 2
A construction method of a steel pipe stirring composite pile is shown in figure 1, and specifically comprises the following construction steps:
step one, designing a scheme: according to the survey data, determining the depth of the soft soil layer 3 of the site to be treated, and designing the length and the diameter of the composite pile, the parameters of the enlarged head 7, the parameters of the spiral stirring wing pieces 8, the parameters of the horizontal stirring wing pieces, the parameters of the lower drill bit, the mixing amount of cement and the like according to the requirements of site buildings.
Step two, cleaning the field: cleaning a field, measuring and paying off, positioning a drilling point according to the requirement of a drawing and marking.
Step three, the pile driver 1 is in place: the pile machine 1 is conveyed to a construction site, a mast is erected, a steel pipe stirring core 6 is hoisted by a crane, and the steel pipe stirring core 6 is fixed with a motor 5 on a guide frame of the pile machine 1; the hydraulic device is adjusted to move the guide frame, so that the steel pipe stirring core 6 is driven to move to an appointed point position, the perpendicularity of the pile driver 1 is corrected, and the perpendicularity error of the steel pipe stirring core 6 is within 1%.
Step four, stirring, spraying and drilling: the mortar pump is started, when the cement slurry is smoothly sprayed out from the slurry outlet 12 of the steel pipe stirring core 6, the motor 5 is started, the steel pipe stirring core 6 rotates and sinks, the cement slurry is sprayed from the slurry outlet 12, the sinking speed of the steel pipe stirring core 6 is set according to relevant specifications and requirements, when the steel pipe stirring core 6 descends to the proper position of the soft soil layer 3, the steel pipe stirring core 6 stays for a period of time to continue stirring and grouting, the pile forming uniformity is ensured, the grouting pressure of the slurry outlet 12 is designed as required, and the grouting amount is determined according to the size of a designed pile foundation.
Step five, forming a pile: and the steel pipe stirring core 6 continuously sinks to the bottom of the pile, stays at the bottom of the pile for a period of time for continuous stirring and grouting, ensures the pile forming uniformity of the composite pile, and removes the buckle connected with the pile machine 1 at the top of the steel pipe stirring core 6 after the stirring is finished.
Step six, cleaning the pile head: after the cement paste is cooled and the composite pile is finished and reaches proper strength, removing cement soil on the top of the composite pile and cleaning residues;
step seven, constructing a foundation: the construction of different foundations, such as pile caps, bearing platforms, composite foundations and the like, can be carried out according to different requirements.
The construction method of the composite pile in the embodiment utilizes the structural characteristics of the steel pipe stirring core 6, the cement paste is sprayed and stirred while the steel pipe stirring core 6 sinks and cuts soil, the pile can be formed in three steps through the third step, the fourth step and the fifth step, the pile pressing step in the traditional composite pile construction is saved, the construction efficiency is high, and the defect that the traditional pile type construction process is complicated is overcome. The composite pile in the embodiment has the characteristics of good stress structure, high bearing capacity, stable quality, high construction efficiency and simple construction process.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111182055.5A CN113981953A (en) | 2021-10-11 | 2021-10-11 | Steel pipe stirring composite pile and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111182055.5A CN113981953A (en) | 2021-10-11 | 2021-10-11 | Steel pipe stirring composite pile and construction method thereof |
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| CN113981953A true CN113981953A (en) | 2022-01-28 |
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| CN202111182055.5A Pending CN113981953A (en) | 2021-10-11 | 2021-10-11 | Steel pipe stirring composite pile and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024234505A1 (en) * | 2023-05-16 | 2024-11-21 | 中铁上海设计院集团有限公司 | Design and construction method for variable-diameter concrete-filled steel tube mixing composite pile |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001140251A (en) * | 1999-11-12 | 2001-05-22 | Tenox Corp | Composite pile and execution method therefor |
| CN109505305A (en) * | 2018-11-23 | 2019-03-22 | 绍兴大明电力设计院有限公司 | High-pressure rotary-spray formula Screw Anchor composite foundation and preparation method thereof |
| CN110847165A (en) * | 2019-11-29 | 2020-02-28 | 河海大学 | Construction method of spiral anchor core-inserting cement mixing pile |
-
2021
- 2021-10-11 CN CN202111182055.5A patent/CN113981953A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001140251A (en) * | 1999-11-12 | 2001-05-22 | Tenox Corp | Composite pile and execution method therefor |
| CN109505305A (en) * | 2018-11-23 | 2019-03-22 | 绍兴大明电力设计院有限公司 | High-pressure rotary-spray formula Screw Anchor composite foundation and preparation method thereof |
| CN110847165A (en) * | 2019-11-29 | 2020-02-28 | 河海大学 | Construction method of spiral anchor core-inserting cement mixing pile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024234505A1 (en) * | 2023-05-16 | 2024-11-21 | 中铁上海设计院集团有限公司 | Design and construction method for variable-diameter concrete-filled steel tube mixing composite pile |
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Application publication date: 20220128 |
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