Uplift pile construction method and system under complex geological conditions

Abstract

According to the uplift pile construction method and system under the complex geological condition, the construction process of the cast-in-situ bored pile is supported through the supporting full pile casing mechanism, and uplift pile construction under the complex geological condition is adapted; a footing reinforcing blade foot is arranged outside the footing of the supporting full casing; the structural strength of the bottom foot part of the supporting full protection cylinder is enhanced through the bottom foot reinforcing blade foot; a plurality of weld joint reinforcing plates are arranged at the weld joints on the two sides of the groove of the supporting full pile casing, so that the welding firmness is enhanced, and the welding sealing degree is increased; a pile casing inner support is arranged in a supporting full pile casing and used for supporting the pile casing, preventing the pile casing from deforming and improving the supporting strength.

Description

Technical Field

[0001] This invention relates to the field of precision machining control technology for pile foundation construction, and more specifically, to a method and system for constructing pull-out piles under complex geological conditions. Background Technology

[0002] Currently, bored piles, especially those used for tension pile engineering, face numerous challenges when constructed in complex geological conditions (such as soft soil, sand layers, water-rich strata, or rockfill areas). Traditional construction methods often employ partial casing support or bare-hole drilling without casing. However, in sites prone to borehole collapse, quicksand, or abundant groundwater, borehole wall stability is difficult to guarantee, leading to problems such as diameter reduction, borehole collapse, and excessive sediment buildup, severely impacting pile quality and tension bearing capacity. To address complex geological conditions, avoiding soil disturbance and borehole wall collapse remains a challenge, with several structural weaknesses. Systematically enhancing existing construction techniques, particularly improving the foundation's resistance to damage, weld reliability, and the casing's deformation resistance, to increase the success rate and pile quality of tension piles under complex geological conditions, remains to be solved. Therefore, it is necessary to propose construction methods and systems for tension piles under complex geological conditions to at least partially address the problems existing in current technologies. Summary of the Invention

[0003] The summary of this invention introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary of this invention does not mean that it attempts to limit the key features and essential technical features of the claimed technical solution, nor does it mean that it attempts to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a method for constructing tension piles under complex geological conditions, characterized by comprising:

[0005] S100 is a support system for the construction of bored piles, which is adapted to the construction of pull-out piles under complex geological conditions.

[0006] S200, a foot reinforcement cutting edge is installed on the outside of the bottom foot of the full casing support; the foot reinforcement cutting edge is used to strengthen the structural strength of the bottom foot of the full casing support.

[0007] S300, at the double-sided weld joint of the bevel of the full casing, multiple weld reinforcement plates are arranged to enhance the weld strength and increase the weld sealing.

[0008] S400, inside the support casing, an internal support is installed to support the casing, prevent casing deformation and increase support strength;

[0009] The construction process of tension piles under complex geological conditions includes: cleaning the hole with a long spiral drill rod and then installing a full casing, or hammering the casing with an impact hammer before drilling; pouring concrete for the tension piles under the protection of the casing, and removing the casing with a vibratory hammer after the concrete is poured; reducing the load when removing the casing; maintaining a set clearance distance from the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; maintaining the precision and accuracy of the tension pile structure under complex geological conditions; and maintaining the construction accuracy of tension piles under complex geological conditions.

[0010] Preferably, S100 includes:

[0011] S101, the support casing includes a steel casing; the steel casing is made of 8mm thick A3 steel plate processed into a set size and rolled into a section. The rolled joint is welded with a bevel on both sides. The bevel double-sided weld is continuous and full to maintain a sealed and waterproof seal.

[0012] S102, the inner diameter of the steel casing is 200-400mm larger than the design pile diameter;

[0013] S103 is a type of bored pile construction using full-casing support, suitable for both uniform and non-uniform deep soft soil strata, preventing borehole collapse during drilling. Complex geological conditions include: uniform or non-uniform deep soft soil strata; medium-stiffness drill rods are used in uniform deep soft soil strata; high-stiffness drill rods are used in non-uniform deep soft soil strata. Medium-stiffness drill rods include D-grade or E-grade steel strength drill rods; high-stiffness drill rods include X-grade, G-grade, or S-grade steel strength drill rods.

[0014] Preferably, S200 includes:

[0015] S201, a base reinforcement cutting edge is installed on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support; the reinforcement cutting edge includes a steel strip with a thickness of 20cm-50cm or an alloy strip with a thickness of 20cm-50cm.

[0016] S202, the bottom foot reinforcement cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

[0017] Preferably, S300 includes:

[0018] S301, at the double-sided weld of the bevel of the full casing, multiple weld reinforcement plates are arranged around the double-sided weld to enhance the weld strength, increase the weld sealing, and improve the weld quality.

[0019] S302, multi-pass weld reinforcement plates are welded to the outer wall of the full casing at the weld joint; the multi-pass weld reinforcement plates include: 2-pass weld reinforcement plates to 8-pass weld reinforcement plates; the weld reinforcement plate dimensions include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

[0020] Preferably, S400 includes:

[0021] S401, multiple internal support points are set on the inner wall of the full casing within the support casing;

[0022] S402, based on multiple internal support points, sets internal supports for the casing, and fixes multiple internal support points on the inner wall of the entire casing; used to support the casing, prevent casing deformation and increase support strength; the internal supports for the casing include: star-shaped internal supports, cross-shaped internal supports, cross-shaped internal supports or arc-shaped internal supports.

[0023] This invention relates to a system for constructing anti-tension piles under complex geological conditions, comprising:

[0024] The full casing support mechanism supports the construction process of bored piles and is suitable for tension pile construction under complex geological conditions.

[0025] The base reinforcement cutting edge mechanism is set on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support.

[0026] The casing weld reinforcement mechanism involves placing multiple weld reinforcement plates at the double-sided weld joints of the bevel supporting the entire casing to enhance weld strength and increase weld sealing.

[0027] The casing internal support mechanism is installed inside the entire casing to support the casing, prevent casing deformation, and increase support strength.

[0028] The construction process of tension piles under complex geological conditions includes: cleaning the hole with a long spiral drill rod and then installing a full casing, or hammering the casing with an impact hammer before drilling; pouring concrete for the tension pile under the protection of the casing, and removing the casing with a vibratory hammer after the concrete is poured; removing the casing with a vibratory hammer; reducing the load when removing the casing; maintaining a set clearance distance from the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; maintaining the precision and accuracy of the tension pile structure under complex geological conditions; and maintaining the accuracy of tension pile construction under complex geological conditions.

[0029] Preferably, the support mechanism for the entire casing includes:

[0030] The support consists of a full casing structure, which includes a steel casing. The steel casing is made of 8mm thick A3 steel plate, processed to a set size, and rolled into a section. The rolled joint is welded with a bevel on both sides, and the bevel weld is continuous and full to maintain a sealed and waterproof seal.

[0031] The steel casing has a radial structure, with an inner diameter 200–400 mm larger than the designed pile diameter.

[0032] The casing support rigidity structure, through the support of the entire casing for bored pile construction, is suitable for tensile pile construction in thick soft soil strata with uniform or non-uniform strata, preventing borehole collapse during drilling. Complex geological conditions include: thick soft soil strata with uniform or non-uniform strata; medium-rigidity drill rods are used for drilling in thick soft soil strata with uniform strata; high-rigidity drill rods are used for drilling in thick soft soil strata with non-uniform strata. Medium-rigidity drill rods include D-grade or E-grade steel-strength drill rods; high-rigidity drill rods include X-grade, G-grade, or S-grade steel-strength drill rods.

[0033] Preferably, the base-reinforced cutting edge mechanism includes:

[0034] The cutting edge structure is reinforced by installing a reinforced cutting edge on the outside of the bottom foot of the full casing support. The reinforced cutting edge strengthens the structural strength of the bottom foot of the full casing support. The reinforced cutting edge is provided by a steel strip or an alloy strip with a thickness of 20cm-50cm.

[0035] The welding structure of the reinforcing cutting edge is reinforced, and the bottom reinforcing cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

[0036] Preferably, the casing weld reinforcement mechanism includes:

[0037] The weld reinforcement structure consists of multiple weld reinforcement plates arranged around the double-sided weld at the bevel of the full casing to enhance weld strength, increase weld sealing, and improve weld quality.

[0038] The reinforced plate welding structure consists of multiple welded reinforcing plates welded to the outer wall of the entire casing at the weld joints; the multiple welded reinforcing plates include: 2-pass welded reinforcing plates to 8-pass welded reinforcing plates; the dimensions of the welded reinforcing plates include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

[0039] Preferably, the internal support mechanism of the casing includes:

[0040] The inner wall has a multi-support point structure, with multiple inner support points set on the inner wall of the entire casing within the support casing;

[0041] The internal support fixing structure is set according to multiple internal support points, and the internal support of the casing is fixedly connected to multiple internal support points on the inner wall of the entire casing; it is used to support the casing, prevent the casing from deforming and increase the support strength; the internal support of the casing includes: star-shaped internal support, cross-shaped internal support, cross-shaped internal support or arc-shaped internal support.

[0042] The beneficial effects of the above technical solution include:

[0043] This invention provides a method and system for constructing tension piles under complex geological conditions. It utilizes a full-casing support mechanism to support the construction of bored cast-in-place piles, adapting to tension pile construction under complex geological conditions. A reinforcing cutting edge is installed on the outside of the bottom of the full-casing support, strengthening the structural strength of the bottom of the full-casing support. Multiple weld reinforcement plates are arranged at the double-sided weld joints of the bevel of the full-casing support to enhance weld strength and increase weld sealing. An internal support is installed inside the full-casing support to support the casing, prevent deformation, and increase support strength. The tension pile construction process under complex geological conditions includes: using a long spiral drill rod to clean... After drilling, a full casing is installed, or an impact hammer is used to hammer down the full casing before drilling; under the protection of the full casing, concrete is poured to create pull-out piles; after the concrete is poured, a vibratory hammer is used to remove the full casing; the load during casing removal is reduced; a set clearance distance is maintained between the pile and the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; the precision and accuracy of the pull-out pile structure are maintained under complex geological conditions; the construction accuracy of the pull-out piles under complex geological conditions is maintained.

[0044] This design solves the problem of high load during casing extraction while ensuring a set clearance distance from the subway diaphragm wall throughout the construction process; significantly improves the accuracy of pull-out pile construction; uses high-rigidity drill rods for drilling in deep, soft, and non-uniform strata to maintain drilling quality; and prevents borehole collapse during drilling in deep, soft soil conditions by using a full steel casing for bored pile construction. The steel casing is made of 8mm thick A3 steel plate, modularly formed, and transported to the construction site. The inner diameter of the casing is approximately 200-400mm larger than the designed pile diameter, and a 30cm wide steel strip of equal thickness is added to the outer edge of the casing as a reinforcing cutting edge. The steel casing is fabricated into a single section using double-sided bevel welding, ensuring all welds are continuous and full to prevent leakage. Four 20cm×20cm×10mm reinforcing plates are installed around the weld to guarantee weld quality. Multiple types of internal supports are used during the casing fabrication process, with adjustments or rework to ensure a diameter error of no more than 5cm. Multiple laser ranging sensors are installed inside and outside the upper part of the casing to continuously monitor the distance from multiple points on the upper inner wall of the casing to the center of the pile diameter and the distance from multiple points on the upper outer wall of the casing to the edge of the foundation pit during the anti-uplift pile construction process. If the distance from multiple points on the upper inner wall of the casing to the center of the pile diameter or from multiple points on the upper outer wall of the casing to the edge of the foundation pit deviates from the theoretical value by more than the set maximum deviation value, an out-of-range warning will be triggered immediately. A digital file for each casing and a digital file for the construction process of each casing-type tensile pile will be established. The casing data in each casing digital file will be linked to the construction data in the subsequent digital files for the construction process of each casing-type tensile pile, so as to achieve data connection and accurate monitoring, timely warning, timely correction and complete digital file records from processing quality to tensile pile construction quality.

[0045] The present invention relates to a method and system for constructing anti-tension piles under complex geological conditions. Other advantages, objectives and features of the present invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0046] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0047] Figure 1 This is an embodiment of the anti-uplift pile construction method and system support casing mechanism under complex geological conditions according to the present invention.

[0048] Figure 2 This is an example of the tensile pile construction method and system under complex geological conditions according to the present invention.

[0049] Figure 3 This is an example of the construction method and system for anti-tension piles under complex geological conditions according to the present invention, which is used for cast-in-place pile construction. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the specification; for example Figures 1-3 As shown, this invention provides a method for constructing tension piles under complex geological conditions, including:

[0051] S100 is a support system for the construction of bored piles, which is adapted to the construction of pull-out piles under complex geological conditions.

[0052] S200, a foot reinforcement cutting edge is installed on the outside of the bottom foot of the full casing support; the foot reinforcement cutting edge is used to strengthen the structural strength of the bottom foot of the full casing support.

[0053] S300, at the double-sided weld joint of the bevel of the full casing, multiple weld reinforcement plates are arranged to enhance the weld strength and increase the weld sealing.

[0054] S400, inside the support casing, an internal support is installed to support the casing, prevent casing deformation and increase support strength;

[0055] The construction process of anti-uplift piles under complex geological conditions includes: cleaning the hole with a long spiral drill rod and then installing a full casing, or hammering down the full casing with an impact hammer, followed by drilling; pouring concrete for the anti-uplift pile under the protection of the full casing, and then removing the full casing with a vibratory hammer after the concrete pouring is completed; removing the full casing with a vibratory hammer; reducing the load during casing removal; maintaining a set clearance distance from the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; and continuously monitoring the upper part of the casing during the anti-uplift pile construction process by arranging multiple laser ranging sensors inside and outside the casing. The distances from multiple points on the casing wall to the center of the pile diameter and from multiple points on the upper outer wall of the casing to the edge of the pit are monitored. When the distances from multiple points on the upper inner wall of the casing to the center of the pile diameter or from multiple points on the upper outer wall of the casing to the edge of the pit deviate from the theoretical value to a set maximum deviation value, an out-of-range warning is immediately triggered. A digital file is established for each casing and a digital file for the construction process of each casing-type tension pile. The casing data in each casing digital file is linked to the construction data in the subsequent digital files for the construction process of each casing-type tension pile, realizing data connection and accurate monitoring from processing quality to tension pile construction quality, timely warning, timely correction, and complete digital file records. The precision and accuracy of the tension pile structure and the construction accuracy of tension piles under complex geological conditions are maintained.

[0056] In one embodiment, S100 includes:

[0057] S101, the support casing includes a steel casing; the steel casing is made of 8mm thick A3 steel plate processed into a set size and rolled into a section. The rolled joint is welded with a bevel on both sides. The bevel double-sided weld is continuous and full to maintain a sealed and waterproof seal.

[0058] S102, the inner diameter of the steel casing is 200-400mm larger than the design pile diameter;

[0059] S103 is a type of bored pile construction using full-casing support, suitable for both uniform and non-uniform deep soft soil strata, preventing borehole collapse during drilling. Complex geological conditions include: uniform or non-uniform deep soft soil strata; medium-stiffness drill rods are used in uniform deep soft soil strata; high-stiffness drill rods are used in non-uniform deep soft soil strata. Medium-stiffness drill rods include D-grade or E-grade steel strength drill rods; high-stiffness drill rods include X-grade, G-grade, or S-grade steel strength drill rods.

[0060] In one embodiment, S200 includes:

[0061] S201, a base reinforcement cutting edge is installed on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support; the reinforcement cutting edge includes a steel strip with a thickness of 20cm-50cm or an alloy strip with a thickness of 20cm-50cm.

[0062] S202, the bottom foot reinforcement cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

[0063] In one embodiment, S300 includes:

[0064] S301, at the double-sided weld of the bevel of the full casing, multiple weld reinforcement plates are arranged around the double-sided weld to enhance the weld strength, increase the weld sealing, and improve the weld quality.

[0065] S302, multi-pass weld reinforcement plates are welded to the outer wall of the full casing at the weld joint; the multi-pass weld reinforcement plates include: 2-pass weld reinforcement plates to 8-pass weld reinforcement plates; the weld reinforcement plate dimensions include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

[0066] In one embodiment, S400 includes:

[0067] S401, multiple internal support points are set on the inner wall of the full casing within the support casing;

[0068] S402, based on multiple internal support points, sets internal supports for the casing, which are fixedly connected to multiple internal support points on the inner wall of the entire casing; used to support the casing, prevent casing deformation and increase support strength; the internal supports for the casing include: star-shaped internal supports, cross-shaped internal supports, intersecting internal supports or arc-shaped internal supports; the length of the internal supports for the casing forms a matching support with the casing diameter, pile diameter and pit diameter, or the length of the internal supports for the casing exceeds the pit diameter.

[0069] This invention relates to a system for constructing anti-tension piles under complex geological conditions, comprising:

[0070] The full casing support mechanism supports the construction process of bored piles and is suitable for tension pile construction under complex geological conditions.

[0071] The base reinforcement cutting edge mechanism is set on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support.

[0072] The casing weld reinforcement mechanism involves placing multiple weld reinforcement plates at the double-sided weld joints of the bevel supporting the entire casing to enhance weld strength and increase weld sealing.

[0073] The casing internal support mechanism is installed inside the entire casing to support the casing, prevent casing deformation, and increase support strength.

[0074] The construction process of anti-uplift piles under complex geological conditions includes: cleaning the hole with a long spiral drill rod and then installing a full-casing support, or using an impact hammer to drive down the full-casing support before drilling; pouring concrete for the anti-uplift pile under the protection of the full-casing support, and then removing the full-casing support using a vibratory hammer after the concrete pouring is completed; removing the full-casing support using a vibratory hammer; reducing the load during the removal of the casing; maintaining a set clearance distance from the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; and continuously monitoring the upper part of the casing during the anti-uplift pile construction process by arranging multiple laser ranging sensors inside and outside the casing. The distances from multiple points on the casing wall to the center of the pile diameter and from multiple points on the upper outer wall of the casing to the edge of the pit are monitored. When the distances from multiple points on the upper inner wall of the casing to the center of the pile diameter or from multiple points on the upper outer wall of the casing to the edge of the pit deviate from the theoretical value to a set maximum deviation value, an out-of-range warning is immediately triggered. A digital file is established for each casing and a digital file for the construction process of each casing-type tension pile. The casing data in each casing digital file is linked to the construction data in the subsequent digital files for the construction process of each casing-type tension pile, realizing data connection and accurate monitoring from processing quality to tension pile construction quality, timely warning, timely correction, and complete digital file records. The precision and accuracy of the tension pile structure and the construction accuracy of tension piles under complex geological conditions are maintained.

[0075] In one embodiment, the support mechanism for the entire casing includes:

[0076] The support consists of a full casing structure, which includes a steel casing. The steel casing is made of 8mm thick A3 steel plate, processed to a set size, and rolled into a section. The rolled joint is welded with a bevel on both sides, and the bevel weld is continuous and full to maintain a sealed and waterproof seal.

[0077] The steel casing has a radial structure, with an inner diameter 200–400 mm larger than the designed pile diameter.

[0078] The casing support rigidity structure, through the support of the entire casing for bored pile construction, is suitable for tensile pile construction in thick soft soil strata with uniform or non-uniform strata, preventing borehole collapse during drilling. Complex geological conditions include: thick soft soil strata with uniform or non-uniform strata; medium-rigidity drill rods are used for drilling in thick soft soil strata with uniform strata; high-rigidity drill rods are used for drilling in thick soft soil strata with non-uniform strata. Medium-rigidity drill rods include D-grade or E-grade steel-strength drill rods; high-rigidity drill rods include X-grade, G-grade, or S-grade steel-strength drill rods.

[0079] In one embodiment, the bottom-foot reinforced cutting edge mechanism includes:

[0080] The cutting edge structure is reinforced by installing a reinforced cutting edge on the outside of the bottom foot of the full casing support. The reinforced cutting edge strengthens the structural strength of the bottom foot of the full casing support. The reinforced cutting edge is provided by a steel strip or an alloy strip with a thickness of 20cm-50cm.

[0081] The welding structure of the reinforcing cutting edge is reinforced, and the bottom reinforcing cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

[0082] In one embodiment, the casing weld reinforcement mechanism includes:

[0083] The weld reinforcement structure consists of multiple weld reinforcement plates arranged around the double-sided weld at the bevel of the full casing to enhance weld strength, increase weld sealing, and improve weld quality.

[0084] The reinforced plate welding structure consists of multiple welded reinforcing plates welded to the outer wall of the entire casing at the weld joints; the multiple welded reinforcing plates include: 2-pass welded reinforcing plates to 8-pass welded reinforcing plates; the dimensions of the welded reinforcing plates include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

[0085] In one embodiment, the internal support mechanism of the casing includes:

[0086] The inner wall has a multi-support point structure, with multiple inner support points set on the inner wall of the entire casing within the support casing;

[0087] The internal support fixing structure is set according to multiple internal support points, and the internal support of the casing is fixedly connected to multiple internal support points on the inner wall of the entire casing; it is used to support the casing, prevent the casing from deforming and increase the support strength; the internal support of the casing includes: star-shaped internal support, cross-shaped internal support, cross-shaped internal support or arc-shaped internal support; the length of the internal support of the casing and the casing diameter, pile diameter and pit diameter form a matching support, or the length of the internal support of the casing exceeds the pit diameter.

[0088] The principle and effects of the above technical solution are as follows: This invention adopts a full-casing support mechanism, which supports the construction process of bored piles and adapts to the construction of pull-out piles under complex geological conditions; a bottom-foot reinforcement cutting edge mechanism is set on the outside of the bottom foot of the full-casing support; the bottom-foot reinforcement cutting edge strengthens the structural strength of the bottom foot of the full-casing support; a casing weld reinforcement mechanism is set at the double-sided weld seam of the bevel of the full-casing support, with multiple weld reinforcement plates arranged to enhance the weld firmness and increase the weld sealing; an internal casing support mechanism is set inside the full-casing support to support the casing, prevent casing deformation, and increase support strength; the full-casing support mechanism supports the construction process of bored piles and adapts to the construction of pull-out piles under complex geological conditions; a bottom-foot reinforcement cutting edge is set on the outside of the bottom foot of the full-casing support; the bottom-foot reinforcement cutting edge strengthens the structural strength of the bottom foot of the full-casing support; the double-sided weld seam of the bevel of the full-casing support... At the weld joints, multiple weld reinforcement plates are installed to enhance weld strength and increase weld sealing. Inside the full-casing support, internal supports are installed to support the casing, prevent deformation, and increase support strength. The construction process for tension piles under complex geological conditions includes: using a long spiral drill rod to clean the hole before lowering the full-casing support, or using an impact hammer to hammer down the full-casing support before drilling; under the protection of the full-casing support, concrete is poured to create tension piles; after concrete pouring, a vibratory hammer is used to remove the full-casing support; the load during casing removal is reduced; a set clearance distance is maintained between the pile and the subway diaphragm wall throughout the construction process; the set clearance distances include: 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, or 1.5 meters; maintaining the precision and accuracy of the tension pile structure under complex geological conditions; maintaining the accuracy of tension pile construction under complex geological conditions.

[0089] This design solves the problem of high load during casing extraction while ensuring a set clearance distance from the subway diaphragm wall throughout the construction process; significantly improves the accuracy of pull-out pile construction; uses high-rigidity drill rods for drilling in deep, soft, and non-uniform strata to maintain drilling quality; and prevents borehole collapse during drilling in deep, soft soil conditions by using a full steel casing for bored pile construction. The steel casing is made of 8mm thick A3 steel plate, modularly formed, and transported to the construction site. The inner diameter of the casing is approximately 200-400mm larger than the designed pile diameter, and a 30cm wide steel strip of equal thickness is added to the outer edge of the casing as a reinforcing cutting edge. The steel casing is processed into a single section, using double-sided bevel welding. All welds are continuous and full to ensure no leakage. Four 20cm×20cm×10mm reinforcing plates are laid around the weld to ensure weld quality. Multiple types of internal supports are used during the processing of the steel casing. Correction or reprocessing is required, and the diameter error should not exceed 5cm. The precision and accuracy of the anti-uplift pile structure are maintained under complex geological conditions, and the construction accuracy of the anti-uplift pile under complex geological conditions is maintained.

[0090] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for constructing tension piles under complex geological conditions, characterized in that, include: S100 is a support system for the construction of bored piles, which is adapted to the construction of pull-out piles under complex geological conditions. S200, a foot reinforcement cutting edge is installed on the outside of the bottom foot of the full casing support; the foot reinforcement cutting edge is used to strengthen the structural strength of the bottom foot of the full casing support. S300, at the double-sided weld joint of the bevel of the full casing, multiple weld reinforcement plates are arranged to enhance the weld strength and increase the weld sealing. S400, inside the support casing, an internal support is installed to support the casing, prevent casing deformation and increase support strength; The construction process of anti-tension piles under complex geological conditions includes: using a long spiral drill rod to clean the hole and then installing a full casing, or using an impact hammer to hammer down the full casing and then drilling to form a hole; Under the protection of the full casing, concrete is poured to form anti-uplift piles. After the concrete is poured, a vibratory hammer is used to remove the full casing. The use of a vibratory hammer to remove the full casing reduces the load when removing the casing. The set distance is maintained between the construction process and the subway diaphragm wall throughout the entire process. The structure of the anti-uplift piles under complex geological conditions is kept precise and accurate. The construction accuracy of the anti-uplift piles under complex geological conditions is maintained.

2. The method for constructing anti-tension piles under complex geological conditions according to claim 1, characterized in that, S100 includes: S101, the support casing includes a steel casing; the steel casing is made of 8mm thick A3 steel plate processed into a set size and rolled into a section. The rolled joint is welded with a bevel on both sides. The bevel double-sided weld is continuous and full to maintain a sealed and waterproof seal. S102, the inner diameter of the steel casing is 200-400mm larger than the design pile diameter; S103 is a type of bored pile construction supported by a full casing, which is suitable for tensile pile construction in thick soft soil uniform strata or thick soft soil non-uniform strata, and prevents hole collapse during drilling.

3. The method for constructing anti-tension piles under complex geological conditions according to claim 1, characterized in that, S200 includes: S201, a base reinforcement cutting edge is installed on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support; the reinforcement cutting edge includes a steel strip with a thickness of 20cm-50cm or an alloy strip with a thickness of 20cm-50cm. S202, the bottom foot reinforcement cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

4. The method for constructing anti-tension piles under complex geological conditions according to claim 1, characterized in that, The S300 includes: S301, at the double-sided weld of the bevel of the full casing, multiple weld reinforcement plates are arranged around the double-sided weld to enhance the weld strength, increase the weld sealing, and improve the weld quality. S302, multi-pass weld reinforcement plates are welded to the outer wall of the full casing at the weld joint; the multi-pass weld reinforcement plates include: 2-pass weld reinforcement plates to 8-pass weld reinforcement plates; the weld reinforcement plate dimensions include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

5. The method for constructing anti-tension piles under complex geological conditions according to claim 1, characterized in that, The S400 includes: S401, multiple internal support points are set on the inner wall of the full casing within the support casing; S402, based on multiple internal support points, sets internal supports for the casing, and fixes multiple internal support points on the inner wall of the entire casing; used to support the casing, prevent casing deformation and increase support strength; the internal supports for the casing include: star-shaped internal supports, cross-shaped internal supports, cross-shaped internal supports or arc-shaped internal supports.

6. A construction system for anti-tension piles under complex geological conditions, characterized in that, include: The full casing support mechanism supports the construction process of bored piles and is suitable for tension pile construction under complex geological conditions. The base reinforcement cutting edge mechanism is set on the outside of the base of the full casing support; the base reinforcement cutting edge strengthens the structural strength of the base of the full casing support. The casing weld reinforcement mechanism involves placing multiple weld reinforcement plates at the double-sided weld joints of the bevel supporting the entire casing to enhance weld strength and increase weld sealing. The casing internal support mechanism is installed inside the entire casing to support the casing, prevent casing deformation, and increase support strength. The construction process of anti-tension piles under complex geological conditions includes: using a long spiral drill rod to clean the hole and then installing a full casing, or using an impact hammer to hammer down the full casing and then drilling to form a hole; Under the protection of the full casing, concrete is poured to form anti-uplift piles. After the concrete is poured, a vibratory hammer is used to remove the full casing. The use of a vibratory hammer to remove the full casing reduces the load when removing the casing. The set distance is maintained between the construction process and the subway diaphragm wall throughout the entire process. The structure of the anti-uplift piles under complex geological conditions is kept precise and accurate. The construction accuracy of the anti-uplift piles under complex geological conditions is maintained.

7. The anti-tension pile construction system under complex geological conditions according to claim 6, characterized in that, The support mechanism for the entire casing includes: The support consists of a full casing structure, which includes a steel casing. The steel casing is made of 8mm thick A3 steel plate, processed to a set size, and rolled into a section. The rolled joint is welded with a bevel on both sides, and the bevel weld is continuous and full to maintain a sealed and waterproof seal. The steel casing has a radial structure, with an inner diameter 200–400 mm larger than the designed pile diameter. The casing support rigidity structure supports the construction of bored piles through full casing support, adapting to the construction of pull-out piles in thick soft soil uniform strata or thick soft soil non-uniform strata, and preventing hole collapse during drilling.

8. The anti-uplift pile construction system under complex geological conditions according to claim 6, characterized in that, The base-strengthened cutting edge mechanism includes: The cutting edge structure is reinforced by installing a reinforced cutting edge on the outside of the bottom foot of the full casing support. The reinforced cutting edge strengthens the structural strength of the bottom foot of the full casing support. The reinforced cutting edge is provided by a steel strip or an alloy strip with a thickness of 20cm-50cm. The welding structure of the reinforcing cutting edge is reinforced, and the bottom reinforcing cutting edge is welded to the outside of the bottom foot of the support casing through side-to-side welding.

9. The anti-tension pile construction system under complex geological conditions according to claim 6, characterized in that, The casing weld reinforcement mechanism includes: The weld reinforcement structure consists of multiple weld reinforcement plates arranged around the double-sided weld at the bevel of the full casing to enhance weld strength, increase weld sealing, and improve weld quality. The reinforced plate welding structure consists of multiple welded reinforcing plates welded to the outer wall of the entire casing at the weld joints; the multiple welded reinforcing plates include: 2-pass welded reinforcing plates to 8-pass welded reinforcing plates; the dimensions of the welded reinforcing plates include: 20cm×20cm×5mm, 20cm×20cm×10mm or 20cm×20cm×15mm.

10. The anti-uplift pile construction system under complex geological conditions according to claim 6, characterized in that, The internal support mechanism of the casing includes: The inner wall has a multi-support point structure, with multiple inner support points set on the inner wall of the entire casing within the support casing; The internal support fixing structure is set according to multiple internal support points, and the internal support of the casing is fixedly connected to multiple internal support points on the inner wall of the entire casing; it is used to support the casing, prevent the casing from deforming and increase the support strength; the internal support of the casing includes: star-shaped internal support, cross-shaped internal support, cross-shaped internal support or arc-shaped internal support.

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