CN-122013758-A - Composite stirring pile with self-healing repair capability and self-healing repair method thereof

Abstract

The invention relates to the technical field of civil engineering, in particular to a composite stirring pile with self-healing repair capability and a self-healing repair method thereof, the composite stirring pile comprises a coaxial pile core and an annular pile shell coated on the periphery of the pile core, wherein the pile core is a flexible pile body and is in a softening flow state after being heated, and the annular pile shell is a rigid pile body. The osmotic pressure value of the annular pile shell is monitored through the monitoring component, the heating component heats the pile core when receiving an osmotic pressure abnormal signal of the monitoring component, so that the pile core is in a softened flow state, and cracks are automatically plugged. The invention, through the combination of rigid-flexible composite structure (coaxial composite pile body) and self-healing repair system, not only fundamentally solves the contradiction that single material can not give consideration to bearing capacity and deformation adaptability, so that the pile body has high strength and good toughness, but also endows the pile body with intelligent characteristics of self-diagnosis and self-healing of damage, changes passive maintenance into active repair, and greatly improves long-term durability and safety of engineering.

Inventors

• DENG JIANQIANG
• LIU SHIMING
• WEI HAIYONG
• GAN HONGQUAN
• LIN DONGCAI
• WU GUOYOU
• WANG FUWAN
• LONG QIHUA
• CHEN RONGHUA
• Huang Michang
• ZHAN JIE
• Wei Tingrui
• HUANG QINGLONG
• Su Hongkuan
• LIAO RUOCHUAN
• Guo Yeshui
• ZHOU YINGFEI
• WEI CHANGSHENG
• WU QIANG
• TAN YING
• CUI WEI
• ZHU YINBANG
• LIU JINGHUI
• ZHU XINMIN
• YANG LUFEI
• ZHENG XIAOYANG
• CHEN GUIBIN

Assignees

• 中国水利水电科学研究院
• 广西壮族自治区水利电力勘测设计研究院有限责任公司

Dates

Publication Date

20260512

Application Date

20251226

Claims (10)

1. 1. A composite stirring pile with self-healing repair capability, comprising: The coaxial composite pile body comprises a pile core (1) positioned at the center and an annular pile shell (2) coaxially coated on the periphery of the pile core (1), wherein the pile core (1) is a flexible pile body, is in a solidification state at normal temperature, and is in a softening flow state after being heated, and the annular pile shell (2) is a rigid pile body; A self-healing repair system comprising a monitoring assembly (3) embedded in the annular pile shell (2) and a heating assembly (4) activated in response to feedback from the monitoring assembly (3); The monitoring assembly (3) is used for monitoring the osmotic pressure value of the annular pile shell (2), and the heating assembly (4) is used for heating the pile core (1) when receiving an osmotic pressure abnormal signal of the monitoring assembly (3) so that the pile core (1) is in a softening flow state.
2. 2. The composite stirring pile with the self-healing repair capability according to claim 1 is characterized in that the pile core (1) is an asphalt stirring pile with the diameter of 0.8-1.2 m, the annular pile shell (2) is an cement stirring pile with the thickness of 0.2-0.3 m, and the overall diameter of the coaxial composite pile body is 1.4-1.6 m.
3. 3. The composite stirring pile with self-healing repair capability according to claim 1, wherein the monitoring component (3) comprises an osmometer embedded in the annular pile shell (2) or embedded in the outer peripheral surface of the annular pile shell (2).
4. 4. A composite stirring pile with self-healing repair capability according to claim 3, characterized in that the monitoring assembly (3) comprises a plurality of sets of said osmometers, which are evenly distributed along the circumferential and axial direction of the annular pile shell (2).
5. 5. Composite stirring pile with self-healing repair capability according to claim 1, characterized in that the heating assembly (4) comprises a heating rod arranged at the joint interface of the pile core (1) and the annular pile casing (2).
6. 6. A composite stirring pile with self-healing repair capability according to claim 5, characterized in that the heating assembly (4) comprises a plurality of the heating rods, which are evenly arranged circumferentially around the pile core (1).
7. 7. The composite stirring pile with self-healing repair capability according to claim 5, wherein the power of the heating rod is 5-8 kw, and the operating temperature of the heating rod is controlled within a range of 60-80 ℃ to ensure that the pile core (1) is fully softened and melted while aging or combustion is avoided.
8. 8. A self-healing repair method for a composite stirring pile, which is applicable to the composite stirring pile with self-healing repair capability according to any one of claims 1 to 7, comprising: Monitoring the osmotic pressure value of the annular pile shell (2) in real time through a monitoring assembly (3); Comparing the osmotic pressure value monitored by the monitoring component (3) with a preset osmotic pressure threshold value, and judging that a damage crack occurs in the pile body and generating an osmotic pressure abnormal signal when the osmotic pressure value exceeds the preset osmotic pressure threshold value; Starting a heating assembly (4) to heat the pile core (1) according to the osmotic pressure abnormal signal; Based on the heating of the heating component (4), the pile core (1) is in a softening flow state, and is filled into a damaged crack of the pile body to perform plugging and self-healing repair.
9. 9. A self-healing repair method of a composite stirring pile according to claim 8, wherein the preset osmotic pressure threshold is 110% of a standard osmotic pressure value.
10. 10. A foundation reinforcing structure, which is characterized in that a plurality of composite stirring piles with self-healing repair capability according to any one of claims 1 to 7 are arranged in a rectangle or quincuncial shape in a soft foundation, the center distance between adjacent composite stirring piles is 1.8-2.2 m, and the depth of embedding a stable rock layer at the pile bottom of the composite stirring piles is not less than 1.5 m.

Description

Composite stirring pile with self-healing repair capability and self-healing repair method thereof Technical Field The invention relates to the technical field of civil engineering, in particular to a composite stirring pile with self-healing repair capability and a self-healing repair method thereof. Background In hydraulic engineering, road engineering and various civil engineering constructions, soft foundations such as deep soft plastic/slush and the like are often encountered, and the foundations have low bearing capacity and high compressibility, and have great stability and deformation risks when engineering constructions are directly carried out on the foundations. Stirring piles are widely used for reinforcing and impermeable treatment of foundation as a common foundation treatment method by forcibly stirring a curing agent and foundation soil to form a reinforcement. The traditional stirring pile adopts a single material system, and is mainly a cement soil stirring pile or an asphalt soil stirring pile. The cement-soil mixing pile has the advantages of high strength and strong bearing capacity, but the material brittleness is large, cracking is easy to occur under the action of uneven load or foundation deformation, and the seepage prevention performance and long-term stability of the cement-soil mixing pile are affected. The prior art attempts to improve the performance of the mixing pile by material modification or optimization of construction parameters, for example, some schemes propose cement soil with different proportions or add external additives, and others focus on the improvement of construction machinery and technology, however, most of the schemes fail to fundamentally solve the contradiction that the 'rigidity' and the 'flexibility' are difficult to be compatible. More importantly, the cement pile body and the asphalt pile body lack self-repairing capability after cracking, once the pile body is cracked due to fatigue, sedimentation or external load, the performance of the pile body can be irreversibly attenuated, and the pile body needs to be repaired by relying on expensive and complicated external intervention and even needs to be rebuilt, so that the maintenance cost and the time cost are greatly increased. Disclosure of Invention The invention provides a composite stirring pile with self-healing repair capability and a self-healing repair method thereof, which are used for solving the defects that the traditional stirring pile in the prior art cannot simultaneously consider the properties of permeation resistance and rigid bearing and does not have the self-healing capability. The invention provides a composite stirring pile with self-healing repair capability, which comprises a coaxial composite pile body and a self-healing repair system, wherein the coaxial composite pile body comprises a pile core positioned at the center and an annular pile shell coaxially coated on the periphery of the pile core, the pile core is a flexible pile body and is in a solidification state at normal temperature, the pile core is heated to be in a softening flow state, the annular pile shell is a rigid pile body, the self-healing repair system comprises a monitoring component buried in the annular pile shell and a heating component started in response to feedback of the monitoring component, the monitoring component is used for monitoring the osmotic pressure value of the annular pile shell, and the heating component is used for heating the pile core when receiving an osmotic pressure abnormal signal of the monitoring component so that the pile core is in the softening flow state. The composite stirring pile with the self-healing repair capability is characterized in that the pile core is an asphalt stirring pile with the diameter of 0.8-1.2 m, the annular pile shell is an cement stirring pile with the thickness of 0.2-0.3 m, and the overall diameter of the coaxial composite pile body is 1.4-1.6 m. According to the composite stirring pile with the self-healing repair capability provided by the invention, the monitoring assembly comprises an osmometer, and the osmometer is embedded in the annular pile shell or embedded in the outer peripheral surface of the annular pile shell. According to the composite stirring pile with the self-healing repair capability provided by the invention, the monitoring assembly comprises a plurality of groups of osmometers, and the plurality of groups of osmometers are uniformly distributed along the circumferential direction and the axial direction of the annular pile shell. According to the composite stirring pile with the self-healing repair capability, the heating assembly comprises the heating rod, and the heating rod is arranged at the joint interface of the pile core and the annular pile shell. According to the composite stirring pile with the self-healing repair capability, the heating assembly comprises a plurality of heating rods, and the heating rods are unifo