Digitalized steel pipe pile and construction method

Abstract

The application discloses a digital and intelligent steel pipe pile and a construction method, and belongs to the technical field of foundation pit supporting. The steel pipe pile body is a hollow structure, adjacent pile bodies are connected through buckle engagement, a grouting channel is formed by welding of a steel plate and a buckle, a grouting hole is arranged, and a strain gauge is arranged to monitor the strain around the pile. An intelligent control system calculates the frictional resistance through strain data and dynamically controls the grouting pressure and quantity based on a big data model. The construction method comprises injecting drag-reducing grout during pile sinking and filling grout during pile pulling, so that intelligent construction is realized. The application is suitable for engineering scenes such as urban underground space development and bridge construction.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit support and cofferdam engineering technology, and specifically to a digital steel pipe pile and its construction method that integrates intelligent sensing and drag-reducing grouting technology. The pile is suitable for engineering scenarios requiring steel pipe pile support, such as urban underground space development, cross-river and cross-sea bridge construction, and artificial island construction. Background Art

[0002] In major projects such as urban underground space development, cross-river and cross-sea bridge construction, and artificial island construction, foundation pit support and cofferdam construction are key links to ensure the safe implementation of the project. As an important engineering structural material, steel pipe piles have significant advantages: high strength, good toughness, the ability to withstand large loads, good bending and shear resistance, fast construction speed, and the ability to use various pile driving methods such as vibration and static pressure, which can effectively shorten the construction period. Their diverse cross-sectional forms allow for flexible design based on project requirements, and they are recyclable and conform to the concept of green construction. Therefore, they are widely used in engineering fields such as foundation pits and cofferdams. However, in actual application, the friction between steel pipe piles and the soil makes pile driving difficult and requires a large amount of mechanical energy. This efficiency is significantly reduced, especially in hard soil layers or complex geological conditions. When removing steel pipe piles, excessive friction between the pile and the soil, coupled with soil loss around the piles, can easily cause ground subsidence or deformation of surrounding buildings. Traditional backfilling techniques (such as sand and soil filling) struggle to effectively fill the voids, posing a safety hazard. Existing steel pipe pile construction relies on empirical control, lacking real-time monitoring and dynamic adjustment mechanisms, and is unable to accurately match frictional resistance changes under complex geological conditions. The following are key issues: how to monitor soil stress changes around the piles in real time and dynamically adjust construction parameters; how to achieve integrated grouting and void filling through structural optimization; and how to improve the stiffness and sealing of steel pipe pile connection nodes to ensure coordinated load bearing across multiple piles. Traditional technologies have not yet addressed the following technical bottlenecks. Therefore, developing a digital steel pipe pile and construction method to effectively reduce friction between piles and soil is essential for industry development. Summary of the Invention

[0003] The present invention aims to provide a digital steel pipe pile and construction method. Through structural innovation and integration of intelligent control systems, the pile-soil friction during pile sinking and pile extraction can be reduced, thereby improving construction efficiency. By real-time monitoring of the strain around the pile, the grouting parameters can be dynamically adjusted to reduce energy consumption and environmental disturbances. Grouting can also be performed synchronously during pile extraction to fill gaps, avoiding secondary construction and improving safety and economy.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a digital steel pipe pile, including a steel pipe pile, a clip and a grouting channel. The main body of the steel pipe pile is a hollow structure with openings at both ends; the clip is welded along the entire length of the outer side of the steel pipe pile, and adjacent steel pipe piles are connected by clip bite; the grouting channel is formed by welding a steel plate and a clip to form a triangular cross-section, which is arranged along the longitudinal length of the pile body, and slurry outlet holes are provided on the steel plate and the bottom of the steel pipe below the grouting channel.

[0005] The slurry channel is formed by welding steel plates and clips to form a triangular cross-section. The triangular cross-section is a mechanically stable structure. By welding the steel plates and clips, the stiffness and integrity of the connection node between the clips and the steel pipe piles are significantly enhanced, ensuring the coordinated force of multiple piles and improving the stability of the support structure. The longitudinal full-length arrangement allows the slurry to be evenly transported along the entire length of the pile body. The slurry outlet holes (matrix distribution) on the lower steel plate and the bottom of the steel pipe ensure that the slurry seeps out synchronously from the inner and outer peripheries of the pile side walls, covering the entire pile-soil contact surface, achieving drag reduction along the entire pile length during pile sinking and full-depth void filling after pile extraction, avoiding local frictional resistance concentration or loose filling. The integrated structural design integrates the drag reduction grouting and void filling functions into the same channel. Bentonite slurry is injected to reduce drag during pile sinking, and cement slurry is injected to fill the voids during pile extraction. No additional equipment or secondary construction is required, shortening the process cycle and reducing construction costs.

[0006] Furthermore, the grouting holes are arranged in a matrix pattern on the steel plate and steel pipe, with a diameter of 5-10 mm and a spacing of 150-250 mm. This matrix distribution ensures uniform slurry penetration along the circumference and longitudinal direction of the pile, covering the pile-soil interface along the entire length of the pile. This prevents localized frictional concentration or loose filling of voids, ensuring continuity and consistency in the drag reduction and filling effects during both pile sinking and pile extraction. The 5-10 mm hole diameter optimizes the fluidity of common slurries such as bentonite slurry and cement slurry. This prevents both slurry blockage caused by too small a hole diameter and insufficient pressure and uncontrolled slurry diffusion caused by too large a hole diameter. This ensures that the slurry penetrates the soil interstices at a reasonable pressure, forming an effective drag-reducing layer or filler. The 150-250 mm hole spacing balances the slurry diffusion range and drilling density, ensuring that the slurry penetration areas of adjacent grouting holes overlap (forming a continuous grouting zone) while reducing the number of ineffective drilling operations, lowering processing costs and the risk of weakening the pile structure, thereby improving construction efficiency.

[0007] Furthermore, strain gauges are arranged circumferentially on the outer surface of the steel pipe pile, a monitoring section is set every 0.5-1.5m, and 4 strain gauges are evenly distributed on each section.

[0008] On the other hand, the present invention provides a digital intelligent control system for steel pipe pile construction, which is suitable for the above-mentioned steel pipe piles, including a grouting pipeline, a slurry pool, a pile periphery strain gauge, a data transmission line, a data analysis module, a data storage module, a display device, a grouting pressure manual input unit, a grouting pressure control unit and a high-pressure grouting device; the strain gauge is arranged on the periphery of the steel pipe pile, and 4 strain gauges are evenly arranged on each section, with a section spacing of 0.5-1.5m; the data analysis module calculates the pile side friction resistance through strain data, and generates grouting control instructions based on the big data model; the data transmission line mainly transmits the monitoring data of the strain gauge during the steel pipe pile construction process; the data storage module is mainly used to store the process and results of data analysis; the display device mainly displays the results of data analysis; the grouting pressure control unit mainly controls The high-pressure grouting equipment receives the grouting pressure and grouting volume data from the data analysis module, and controls the grouting according to the received data; at the same time, the grouting pressure control unit can also receive instructions for manual input of data, and control the grouting according to the requirements of manual input; the grouting pressure manual input unit mainly provides an interface for manual input of grouting pressure and grouting volume, and can manually control the grouting; one end of the high-pressure grouting equipment is connected to the slurry pool, and the other end is connected to the grouting pipe to grout the grouting channel. The high-pressure grouting equipment mainly provides grouting pressure, controls the grouting volume, and receives instructions from the grouting pressure control unit; the grouting pipe connects the high-pressure grouting equipment and the grouting channel on the steel pipe pile, injects the slurry into the grouting channel, and the grouting pipe is tightly connected to the grouting channel to ensure sealing; the slurry pool is mainly used to store slurry.

[0009] Furthermore, the data analysis module has a built-in frictional resistance calculation formula:

[0010] ;

[0011] ;

[0012] ;

[0013] Where, E is the elastic modulus of the steel pipe pile; ε is the monitoring data of the strain gauge; n for i The number of strain gauges at the cross section; for i Compressive stress at the cross section; for i The internal friction angle of the soil at the cross section can be determined based on geological survey data; for i The soil cohesion at the cross section can be determined from geological survey data; for iShear strength of soil at the surface of the cross-section pile; D 1 is the inner diameter of the steel pipe pile; D 2 is the outer diameter of the steel pipe pile; L is the length of the steel pipe pile;

[0014] According to the above formula, the friction resistance around the pile is:

[0015] .

[0016] Furthermore, the high-pressure grouting equipment has an output pressure of 0-20 MPa and a flow rate of 0-150 L / min, and can inject bentonite slurry or cement slurry. The grouting pipe and the grouting channel are connected by flange sealing.

[0017] In one aspect, the present invention further provides a digital steel pipe pile construction method, which uses the above-mentioned digital steel pipe pile construction intelligent control system, including the following steps:

[0018] S1, level the site, measure and stake out the positions of steel pipe piles;

[0019] S2, construction positioning guide beam, control guide beam elevation and verticality;

[0020] S3: Drive the first steel pipe pile using static pressure, vibration, or hammering. Simultaneously inject drag-reducing grouting fluid through the grouting channel and dynamically adjust grouting parameters based on strain monitoring.

[0021] S4, driving subsequent steel pipe piles in sequence and connecting them by snap fasteners to form a continuous wall;

[0022] S5: After the main structure is completed, the steel pipe piles are removed and the filling slurry is injected simultaneously.

[0023] Furthermore, the drag reduction slurry is bentonite slurry with a density of 1.05-1.2 g / cm 3 The filling slurry is M10-M15 cement slurry with a water-cement ratio of 0.45-0.55.

[0024] Furthermore, during the pile sinking process, when the pile side friction resistance exceeds 80% of the design value, the grouting pressure is automatically increased to 1.0-2.0MPa; when pulling out the pile, the grouting pressure and the pile pulling speed are controlled in conjunction to ensure that the gaps are filled densely.

[0025] Furthermore, the intelligent control algorithm based on big data analysis determines the grouting pressure and post-grouting volume according to the analysis of the friction force around the pile, and outputs the instructions and calculation results to the data storage module, and displays them on the display device; when the friction resistance around the pile is large, the grouting pressure and grouting volume are correspondingly large; when the friction resistance on the pile side decreases, the grouting pressure and grouting volume are correspondingly reduced; when the friction resistance on the pile side remains at a small value, the grouting can be stopped according to the actual situation.

[0026] Beneficial effects of the present invention:

[0027] (1) The snap-fit ​​connection enhances the pile's coordinated force and sealing, achieving water-stopping and soil-retaining properties. The grouting channel is integrated with the pile body, combining the functions of pile sinking and pile pulling to fill the pile, thus avoiding secondary construction. The matrix distribution of the grouting holes optimizes the grouting penetration effect, improving the drag reduction and filling efficiency.

[0028] (2) Strain gauges are combined with big data models to calculate pile side friction in real time and automatically match grouting parameters (pressure, flow rate) to accurately respond to complex geological conditions and reduce reliance on manual experience. During pile sinking, if friction exceeds a threshold, grouting is automatically increased with pressure. During pile extraction, pressure and speed are linked to ensure that voids are densely filled, reducing the risk of ground subsidence.

[0029] (3) Static pressure / vibration / hammer pile driving combined with drag reduction grouting reduces pile driving energy consumption and improves construction efficiency. Recyclable steel pipe piles conform to the concept of green construction. Bentonite slurry and cement slurry are used for drag reduction and filling, respectively. These materials are environmentally friendly and reduce soil disturbance and environmental pollution. The intelligent control system integrates data monitoring, analysis, storage, and display functions to improve construction safety and traceability. The continuous wall is connected by snap-fit ​​to form an integral structure, which enhances support rigidity and ensures the safety of the foundation pit and cofferdam projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the front view of the steel pipe pile.

[0031] Figure 2 This is a schematic diagram of the overall appearance of steel pipe piles.

[0032] Figure 3 This is an enlarged view of the slurry outlet hole at the bottom of the grouting channel.

[0033] Figure 4 It is a schematic diagram of the slurry intelligent control system.

[0034] Description of Figure Numbers:

[0035] 1-Steel pipe pile; 2-Snap fastener; 3-Grouting channel. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0037] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0038] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. As used herein, "one" not only means "only one" but also "more than one."

[0039] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0040] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and rear) used to explain the structure and movement of various components of the present invention are not absolute but relative. These descriptions are applicable when the components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, the directional indications will also change accordingly.

[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0043] The steel pipe pile structure proposed in this embodiment is as follows Figure 1-3 As shown, it includes 1-steel pipe pile, 2-clip, 3-grouting channel. The details of each part are as follows:

[0044] 1) The steel pipe pile is a hollow structure with openings at both ends. It is the main load-bearing structure and is inserted into the soil layer. The steel pipe and the soil are jointly loaded with the load. The length of the steel pipe pile can be extended by welding according to actual needs.

[0045] 2) The clips are connected to the steel pipe piles by welding and are set along the entire length of the outer side of the steel pipe piles. Two adjacent steel pipe piles are connected by the clips. The clips bite to stop water and retain soil, allowing multiple steel pipe piles to bear force in a coordinated manner.

[0046] 3) The grouting channel is a triangular channel formed by the steel plate and the steel pipe clip. The steel plate should be firmly welded to the steel pipe and the clip. The structure significantly improves the integrity and rigidity of the clip and the steel pipe pile. Slurry holes are provided on the steel plate and the steel pipe below the grouting channel to ensure that after grouting, the slurry can seep into the inner and outer periphery of the steel pipe side wall, thereby achieving a drag reduction effect during the injection and removal of the steel pipe pile.

[0047] The grouting intelligent control system in this embodiment mainly consists of pile-circumferential strain gauges, data transmission lines, data analysis modules, data storage modules, display devices, grouting pressure control units, grouting pressure manual input units, high-pressure grouting equipment, grouting pipelines, and slurry tanks. Figure 4 The schematic diagram of each part is described in detail as follows:

[0048] 1) Strain gauges are attached to the outer circumference of the steel pipe pile, with four gauges attached to each section. A strain gauge monitoring section is set every 1m to monitor the strain during the construction of the steel pipe pile in real time. The strain gauges and their data transmission lines are closely attached to the steel pipe pile and are reinforced to prevent damage.

[0049] 2) Data transmission line, mainly transmits the monitoring data of strain gauges during the construction of steel pipe piles;

[0050] 3) Data analysis module, which mainly receives the pile circumferential strain data, analyzes the pile side friction resistance, and analyzes the required grouting pressure based on big data artificial intelligence. The calculation formula for the pile side friction resistance is:

[0051] ;

[0052] ;

[0053] ;

[0054] Where, E is the elastic modulus of the steel pipe pile; ε is the monitoring data of the strain gauge; n for i The number of strain gauges at the cross section; for i Compressive stress at the cross section; for i The internal friction angle of the soil at the cross section can be determined based on geological survey data; for i The soil cohesion at the cross section can be determined from geological survey data; for i Shear strength of soil at the surface of the cross-section pile; D 1 is the inner diameter of the steel pipe pile; D 2 is the outer diameter of the steel pipe pile; L is the length of the steel pipe pile;

[0055] According to the above formula, the friction resistance around the pile is:

[0056] .

[0057] Then, using big data and artificial intelligence, the grouting pressure and post-grouting volume are determined based on the friction analysis around the pile. The instructions and calculation results are then output to the data storage module and displayed on the display device. When the friction around the pile is high, the grouting pressure and volume are increased accordingly. When the friction around the pile decreases, the grouting pressure and volume are reduced accordingly. When the friction around the pile remains low, grouting can be stopped according to the actual situation.

[0058] 4) Data storage module, mainly used to store the process and results of data analysis;

[0059] 5) Display device, mainly displays the results of data analysis;

[0060] 6) Grouting pressure control unit, which mainly controls the high-pressure grouting equipment, receives the grouting pressure and grouting volume data from the data analysis module, and controls the grouting according to the received data; at the same time, the grouting pressure control unit can also receive instructions for manually input data and control the grouting according to the requirements of manual input;

[0061] 7) Grouting pressure manual input unit, which mainly provides an interface for manual input of grouting pressure and grouting volume, and can manually control grouting;

[0062] 8) High-pressure grouting equipment, which mainly provides grouting pressure, controls the grouting volume, and receives instructions from the grouting pressure control unit;

[0063] 9) Grouting pipe: connect the high-pressure grouting equipment and the grouting channel on the steel pipe pile, inject the slurry into the grouting channel, and connect the grouting pipe and the grouting channel tightly to ensure sealing;

[0064] 10) Slurry pool, the main function is to store slurry.

[0065] Another embodiment proposes a specific solution for digital steel pipe pile construction as follows:

[0066] The first step is to level the construction site and measure and mark the construction position of the steel pipe piles.

[0067] The second step is the construction of steel pipe pile positioning guide beams.

[0068] Third step, the first number of intelligent steel pipe pile is hit into construction, mainly adopts static pressure or vibration pile sinking, and also adopts hammer pile sinking in the area with low environmental requirement. In the process of hitting, the bentonite mud is injected through the grouting channel to reduce the side friction resistance around the pile, and the grouting pressure and grouting amount are automatically adjusted in real time by the intelligent system according to the lateral strain of the steel pipe pile. When the side friction resistance around the pile is large, the grouting pressure and grouting amount are large; when the side friction resistance of the pile is reduced, the grouting pressure and grouting amount are reduced; when the side friction resistance of the pile is maintained at a small value, the grouting can be stopped according to the actual situation; when the steel pipe pile construction experience in the area is rich, the manual grouting parameters can also be directly inputted to control the grouting manually. The length of the steel pipe pile can be welded to be lengthened according to the actual engineering needs.

[0069] Fourth step, repeat the third step, and hit the second number of intelligent steel pipe pile, and the steel pipe piles are connected through buckles to ensure that the steel pipe piles are connected tightly.

[0070] Fifth step, repeat the third step and the fourth step until all the steel pipe piles are constructed.

[0071] Sixth step, when the main structure is completed, the steel pipe pile is pulled out, the cement slurry is injected through the grouting channel, and the grouting pressure and grouting amount are automatically adjusted in real time by the intelligent system according to the lateral strain of the steel pipe pile; at this time, the cement slurry has two functions, the first is to reduce the side friction resistance of the steel pipe pile, and the second is to fill the gap after the steel pipe pile is pulled out to avoid the ground subsidence caused by the gap after the steel pipe pile is pulled out.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A digital intelligent control system for steel pipe pile construction, characterized in that: It includes digital steel pipe piles, grouting pipelines, slurry pools, pile-circumferential strain gauges, data transmission lines, data analysis modules, data storage modules, display devices, grouting pressure manual input units, grouting pressure control units and high-pressure grouting equipment; the strain gauges are arranged on the periphery of the steel pipe piles, and 4 strain gauges are evenly arranged on each monitoring section, with a section spacing of 0.5-1.5m; the data analysis module calculates the pile side friction resistance through strain data, and generates grouting control instructions based on the big data model; the data transmission line mainly transmits the monitoring data of the strain gauges during the construction of the steel pipe piles; the data storage module is mainly used to store the process and results of data analysis; the display device mainly displays the results of data analysis; the grouting pressure control unit mainly controls the high-pressure grouting equipment and receives the grouting pressure from the data analysis module and grouting volume data, and controls grouting according to the received data; at the same time, the grouting pressure control unit can receive instructions for manually input data and control grouting according to the requirements of manual input; the grouting pressure manual input unit mainly provides an interface for manually inputting grouting pressure and grouting volume, and can manually control grouting; one end of the high-pressure grouting equipment is connected to the slurry pool, and the other end is connected to the grouting pipe to grout the grouting channel. The high-pressure grouting equipment mainly provides grouting pressure, controls the grouting volume, and receives instructions from the grouting pressure control unit; the grouting pipe connects the high-pressure grouting equipment and the grouting channel on the steel pipe pile to inject slurry into the grouting channel. The grouting pipe is tightly connected to the grouting channel to ensure sealing; the slurry pool is mainly used to store slurry; the data analysis module has a built-in friction resistance calculation formula: ； ； ； Where, E is the elastic modulus of the steel pipe pile; ε is the monitoring data of the strain gauge; n for i The number of strain gauges at the cross section; for i Compressive stress at the cross section; for i The internal friction angle of the soil at the cross section can be determined based on geological survey data; for i The soil cohesion at the cross section can be determined from geological survey data; for i Shear strength of soil at the surface of the cross-section pile; D 1 is the inner diameter of the steel pipe pile; D 2 is the outer diameter of the steel pipe pile; L is the length of the steel pipe pile; According to the above formula, the friction resistance around the pile is: ； The digital steel pipe pile comprises a steel pipe pile (1), a clip (2) and a grouting channel (3); the main body of the steel pipe pile is a hollow structure with two ends open; the clip is welded along the entire length of the outer side of the steel pipe pile, and adjacent steel pipe piles are connected by snapping the clip; the grouting channel is formed by welding a steel plate and the clip to form a triangular cross-section, and is arranged along the longitudinal length of the pile body, and grouting holes are provided on the steel plate and the bottom of the steel pipe below the grouting channel.

2. The digital intelligent control system for steel pipe pile construction according to claim 1 is characterized in that: The slurry outlet holes are distributed in a matrix on the steel plate and the steel pipe body, with a hole diameter of 5-10 mm and a hole spacing of 150-250 mm.

3. The digital intelligent control system for steel pipe pile construction according to claim 2 is characterized in that: Strain gauges are arranged circumferentially on the outer surface of the steel pipe pile (1), with a monitoring section set every 0.5-1.5 m, and 4 strain gauges are evenly distributed on each section.

4. The digital intelligent control system for steel pipe pile construction according to claim 1 is characterized by: The high-pressure grouting equipment has an output pressure of 0-20 MPa and a flow rate of 0-150 L / min, and can inject bentonite slurry or cement slurry. The grouting pipe and the grouting channel are connected by flange sealing.

5. A digital steel pipe pile construction method, using the digital steel pipe pile construction intelligent control system according to any one of claims 1 to 4, characterized in that The following steps are involved: S1, level the site, measure and stake out the positions of steel pipe piles; S2, construction positioning guide beam, control guide beam elevation and verticality; S3: Drive the first steel pipe pile using static pressure, vibration, or hammering. Simultaneously inject drag-reducing grouting fluid through the grouting channel and dynamically adjust grouting parameters based on strain monitoring. S4, driving subsequent steel pipe piles in sequence and connecting them by snap fasteners to form a continuous wall; S5: After the main structure is completed, the steel pipe piles are removed and the filling slurry is injected simultaneously.

6. The construction method according to claim 5, characterized in that: The drag reduction slurry is bentonite slurry with a density of 1.05-1.2 g / cm 3 The filling slurry is M10-M15 cement slurry with a water-cement ratio of 0.45-0.

55.

7. The construction method according to claim 5, characterized in that: During the pile sinking process, when the pile side friction resistance exceeds 80% of the design value, the grouting pressure is automatically increased to 1.0-2.0MPa; when pulling out the pile, the grouting pressure and the pile pulling speed are controlled in conjunction to ensure that the gaps are filled densely.

8. The construction method according to claim 5, characterized in that: The intelligent control algorithm based on big data analysis determines the grouting pressure and post-grouting volume according to the friction analysis around the pile, and outputs the instructions and calculation results to the data storage module and displays them on the display device; when the friction resistance around the pile is large, the grouting pressure and grouting volume are correspondingly large; when the friction resistance on the pile side decreases, the grouting pressure and grouting volume are correspondingly reduced; when the friction resistance on the pile side remains at a small value, the grouting can be stopped according to the actual situation.

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