Steel pipe pile construction method

Abstract

This invention relates to the technical field of steel pipe piles and discloses a construction method for steel pipe piles, including the following construction steps: 1) forming a soil layer hole; 2) forming a rock layer hole, the soil layer hole and the rock layer hole forming a pile hole; 3) lowering a reinforcing cage; 4) providing a steel pipe column, the steel pipe column and the tool section are combined to form a steel pipe tool column; 5) the steel pipe tool column and the reinforcing cage are simultaneously lowered into the pile hole, the lower section of the steel pipe column and the pile hole enclose to form a lower ring space; the upper section of the steel pipe column and the pile hole have an upper ring space; 6) first pouring concrete, the concrete fills the bottom space, the interior of the lower section and the lower ring space, forming a lower concrete section; 7) a gravel section is formed at the bottom of the upper ring space; 8) second pouring concrete, the concrete fills the interior of the upper section, forming an upper concrete section; 9) the tool section is separated from the steel pipe column; 10) filling with soil to form a soil section; the entire construction process is convenient and fast, greatly improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of steel pipe piles, and more specifically, to a method for constructing steel pipe piles. Background Technology

[0002] Steel pipe piles effectively constrain the internal concrete through the steel pipe column, placing the core concrete in a triaxial compressive stress state, thereby significantly improving its strength, plasticity, and toughness. Steel pipe piles have superior comprehensive performance, excellent pile body mechanical properties, high overall stiffness, good ductility, and good seismic performance.

[0003] In the existing technology, during the construction of steel pipe piles, the steel pipe column is connected to the tool column and then lowered into the pile hole. Concrete is then poured into the steel pipe column, and after the concrete has solidified, the tool column is removed to form the steel pipe pile. However, the current steel pipe pile construction method has the drawback of low construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for steel pipe piles, which aims to solve the problem of low construction efficiency in existing steel pipe pile construction methods.

[0005] This invention is implemented as follows: a steel pipe pile construction method, comprising the following construction steps: 1) Using a full-rotation drilling rig, a steel casing is lowered into the soil layer, and the soil in the steel casing is grabbed to form a soil hole in the soil layer, the bottom of which extends to the rock surface of the rock layer. 2) Drilling is carried out in the rock strata to form a rock strata hole, and the soil hole and the rock strata hole are connected vertically to form a pile hole; 3) Lower the reinforcing cage into the pile hole; 4) Provide a steel pipe column, the top of which is connected to a tool section. The steel pipe column and the tool section are arranged coaxially to form a steel pipe tool column. The bottom of the tool section has a butt joint section, and the outer periphery of the butt joint section is provided with multiple overflow holes. 5) Use lifting equipment to lift the horizontally arranged steel pipe tool column into a longitudinal arrangement, and then combine the steel pipe tool column with the reinforcing cage as one unit. The steel pipe tool column and the reinforcing cage are simultaneously lowered into the pile hole until the bottom of the reinforcing cage abuts against the bottom of the pile hole. When the bottom of the reinforcing cage abuts against the bottom of the pile hole, there is a bottom gap between the bottom of the steel pipe column and the bottom of the pile hole, and the top of the tool section is exposed above the pile hole. The lower part of the steel pipe column has a lower section, and the bottom of the lower section forms a bottom gap with the bottom of the pile hole. The lower section and the inner wall of the pile hole enclose each other to form an annular lower annular gap, and the reinforcing cage is surrounded in the lower annular gap. The upper part of the steel pipe column has an upper section, the bottom of which is connected to the top of the lower section, the tool section is connected to the top of the upper section, and there is an upper ring gap between the upper section and the inner wall of the pile hole. 6) Insert a guide pipe into the tool section. The guide pipe extends into the lower section. Concrete is poured for the first time through the guide pipe. The concrete is discharged through the bottom of the steel pipe column until the concrete fills the bottom gap, the interior of the lower section, and the lower ring gap, forming the lower concrete section. 7) Fill the lower part of the upper ring space with crushed stone to form crushed stone sections; 8) Pour concrete into the upper section through the guide pipe until the concrete fills the interior of the upper section, forming the upper concrete section; 9) After the concrete has solidified, the upper concrete section, the lower concrete section and the steel pipe column are combined to form a steel pipe pile. The tool section is then separated from the steel pipe column, and the tool section and the steel casing are pulled out of the soil. 10) Soil is filled in the upper part of the upper ring space to form a soil segment that covers the top of the steel pipe column and extends to the top of the pile hole.

[0006] Furthermore, in construction step 2), a down-the-hole hammer is used to drill a small-diameter hole in the rock stratum to form a hole, and a core drill is used to enlarge the small-diameter hole to form the rock stratum hole.

[0007] Furthermore, in construction step 3), after the steel cage is lowered to a predetermined depth, the steel cage is fixed, and the steel cage has an upper section extending above the pile hole; In construction step 5), after the steel pipe tool column is lowered into the pile hole to a predetermined depth, the upper section is connected to the steel pipe column of the steel pipe tool column so that the steel reinforcement cage and the steel pipe tool column are combined into a steel pipe reinforcement structure. The steel pipe reinforcement structure is then lowered into the pile hole until the bottom of the steel reinforcement cage abuts against the bottom of the pile hole.

[0008] Furthermore, in construction step 5), the outer periphery of the steel pipe column is provided with multiple upper hooks, which are arranged sequentially and at intervals along the circumference of the steel pipe column; the outer periphery of the upper section is provided with multiple lower hooks, which are arranged sequentially and at intervals along the circumference of the upper section; the multiple upper hooks and the multiple lower hooks are respectively arranged vertically and vertically, and the upper hooks and lower hooks are connected by connecting bars so that the steel pipe tool column and the reinforcing cage are connected as one unit.

[0009] Furthermore, in construction step 5), the upper end of the upper hook is connected to the steel pipe column, and the lower end of the upper hook is bent outward away from the steel pipe column to form the lower end position; the lower end of the lower hook is connected to the reinforcing cage, and the upper end of the lower hook is arranged longitudinally to form the upper end position; the upper end position and the lower end position are arranged longitudinally and are aligned; the upper end of the connecting bar is connected to the lower end position, and the lower end of the connecting bar is connected to the upper end position, and the connecting bar is arranged longitudinally.

[0010] Furthermore, in construction step 5), the lifting equipment includes a main crane and an auxiliary crane. The main crane is connected to the top of the tool section via a main lifting rope, and the auxiliary crane is connected to the outer periphery of the steel pipe column via an auxiliary lifting rope. The main lifting rope and the auxiliary lifting rope lift upwards synchronously, and the lifting speed of the main lifting rope is greater than that of the auxiliary lifting rope, so that the steel pipe tool column changes from a horizontal position to an inclined position. When the tilt angle of the steel pipe tool column exceeds the set angle, the auxiliary lifting rope is detached from the steel pipe column, and the main lifting rope is lifted independently upwards until the steel pipe tool column is arranged longitudinally.

[0011] Furthermore, in construction step 6), after the first concrete pour, the top of the lower concrete section extends beyond the bottom of the lower section and reaches above the reinforcing cage.

[0012] Furthermore, in construction step 4), the upper section is provided with a partition structure on its outer periphery, and the partition structure extends around the outer periphery of the upper section; the partition structure is provided with an elastically deformable annular cavity, and the annular cavity extends around the circumference of the upper section. In construction step 6), after the first concrete pour, the concrete presses against the partition structure from bottom to top, and the concrete enters the annular cavity from bottom to top, driving the annular cavity to expand and deform elastically upward. In construction step 7), after a crushed stone segment is formed in the lower part of the upper annular space, the bottom of the crushed stone segment presses against the partition structure, driving the annular cavity to elastically compress and deform downwards. The partition structure restricts the crushed stone in the crushed stone segment from entering the lower concrete segment.

[0013] Furthermore, in construction step 4), the partition structure includes an elastic lower ring plate, which is arranged around the circumference of the upper section. The lower ring plate has multiple through holes arranged vertically. The inner end of the lower ring plate is connected to the outer periphery of the upper section, the middle part of the lower ring plate is bent downward and protrudes, and the outer end of the lower ring plate forms an outwardly curved ring, which abuts against the inner wall of the pile hole. The lower ring plate is provided with an elastic upper ring plate, which is arranged around the upper section in a circumferential direction; the inner end of the upper ring plate is connected to the lower ring plate, the middle part of the upper ring plate is bent upward and protrudes, the outer end of the upper ring plate is movably arranged and is spaced apart from the lower ring plate to form an annular gap, and the annular cavity is formed between the upper ring plate and the lower ring plate. In construction step 6), after the first concrete pour, the concrete enters the annular cavity through multiple through holes, fills the annular cavity, and drives the upper ring plate to elastically deform upward, while the annular cavity expands and deforms elastically in sync. In construction step 7), after the crushed stone segment is formed in the lower part of the upper ring interval, the bottom of the crushed stone segment presses against the upper ring plate, driving the upper ring plate to deform elastically downward. The annular cavity is simultaneously elastically compressed and deformed, and the concrete in the annular cavity is squeezed out from the annular interval upward, supporting the crushed stone segment in the opposite direction.

[0014] Furthermore, in construction step 4), the upper ring plate is provided with a plurality of vertically through strip holes, the plurality of strip holes are arranged at intervals around the circumference of the upper ring plate, and the strip holes are arranged to extend radially along the upper ring plate. In construction step 7), during the process of forming a crushed stone segment at the lower part of the upper ring space, the crushed stone segment is pressed downwards and the upper ring plate is elastically deformed downwards. The crushed stone at the bottom of the crushed stone segment is embedded in the annular cavity through the strip hole, and the concrete in the annular cavity supports the crushed stone segment in the direction of the direction.

[0015] Compared with existing technologies, the steel pipe pile construction method provided by this invention involves lowering a reinforcing cage into the pile hole, followed by lowering a steel pipe tool column. There is a bottom gap between the bottom of the steel pipe column and the bottom of the pile hole. During the initial concrete pouring, the concrete can rise upward through the bottom gap to form a lower concrete section. After the outer periphery of the steel pipe column is stabilized by a crushed stone section, a second concrete pour is made to form an upper concrete section inside the steel pipe column. Then, the tool section and the backfill soil section are removed. The entire construction process is convenient and fast, greatly improving construction efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the interior of the pile hole provided by the present invention; Figure 2 This is an internal schematic diagram of the pile hole prepared for the lowering of the reinforcing cage and steel pipe tool column, provided by the present invention. Figure 3 yes Figure 2 Enlarged diagram of point A in the diagram; Figure 4 This is an internal schematic diagram of the steel reinforcement cage and steel pipe tool column being lowered into the pile hole provided by the present invention; Figure 5This is a schematic diagram of the internal structure of the steel pipe column provided by the present invention; Figure 6 This is a front view schematic diagram of the partition structure provided by the present invention; Figure 7 This is a top view schematic diagram of the partition structure provided by the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0019] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Reference Figure 1-7 The image shown is a preferred embodiment of the present invention.

[0021] The construction method for steel pipe piles includes the following steps: 1) Using a full-rotation drilling rig, a steel casing is lowered into the soil layer 100, and the soil in the steel casing is grabbed to form a soil hole 101 in the soil layer 100. The bottom of the soil hole 101 extends to the rock surface of the rock layer 200. 2) Drilling is carried out in the rock stratum 200 to form a rock stratum hole 201 in the rock stratum 200. The soil hole 101 is connected to the rock stratum hole 201 vertically to form a pile hole. 3) Lower a 300mm steel reinforcement cage into the pile hole; 4) Provide a steel pipe column 400, the top of which is connected to a tool section 500. The steel pipe column 400 and the tool section 500 are arranged coaxially and combined to form a steel pipe tool column. The bottom of the tool section 500 has a butt joint section 502, and the outer periphery of the butt joint section 502 is provided with multiple overflow holes 501. 5) Use lifting equipment to lift the horizontally arranged steel pipe tool column into a longitudinal arrangement, and then combine the steel pipe tool column with the steel reinforcement cage 300 into one piece. The steel pipe tool column and the steel reinforcement cage 300 are simultaneously lowered into the pile hole until the bottom of the steel reinforcement cage 300 abuts against the bottom of the pile hole. After the bottom of the steel cage 300 abuts against the bottom of the pile hole, there is a bottom gap 108 between the bottom of the steel pipe column 400 and the bottom of the pile hole, and the top of the tool section 500 is exposed above the pile hole. The lower part of the steel pipe column 400 has a lower section, and the bottom of the lower section forms a bottom gap 108 with the bottom of the pile hole. The lower section and the inner wall of the pile hole form an annular lower annular gap 102, and the steel cage 300 is surrounded in the lower annular gap 102. The upper part of the steel pipe column 400 has an upper section, the bottom of which is connected to the top of the lower section. The tool section 500 is connected to the top of the upper section. There is an upper ring gap 103 between the upper section and the inner wall of the pile hole. 6) Insert the guide pipe into the tool section 500. The guide pipe extends into the lower section. Concrete is poured for the first time through the guide pipe. The concrete is discharged through the bottom of the steel pipe column 400 until the concrete fills the bottom gap 108, the interior of the lower section and the lower ring gap 102, forming the lower concrete section 104. 7) Fill the lower part of the upper ring interval 103 with crushed stone to form crushed stone section 106; 8) Pour concrete into the upper section through the guide pipe until the concrete fills the interior of the upper section, forming the upper concrete section 105; 9) After the concrete has solidified, the upper concrete section 105, the lower concrete section 104 and the steel pipe column 400 are combined to form a steel pipe pile. The tool section 500 is separated from the steel pipe column 400, and the tool section 500 and the steel casing are pulled out of the soil layer 100. 10) Soil is filled in the upper part of the upper ring spacing 103 to form a soil section 107, which covers the top of the steel pipe column 400 and extends to the top of the pile hole.

[0022] The steel pipe pile construction method described above involves lowering a reinforcing cage 300 into the pile hole, followed by lowering a steel pipe tool column 400. There is a bottom gap 108 between the bottom of the steel pipe column 400 and the bottom of the pile hole. During the initial concrete pouring, the concrete can rise upwards through the bottom gap 108 to form the lower concrete section 104. After the crushed stone section 106 pressurizes and stabilizes the outer periphery of the steel pipe column 400, a second concrete pour is made to form the upper concrete section 105 inside the steel pipe column 400. Then, the tool section 500 and the backfill soil section 107 are removed. The entire construction process is convenient and fast, greatly improving construction efficiency.

[0023] As an extended embodiment, in construction step 2), a down-the-hole hammer is used to drill down-the-hole in the rock stratum 200 to form a small-diameter hole, and a core drill is used to enlarge the small-diameter hole to form a rock stratum hole 201. In this way, the formation of the rock stratum hole 201 is facilitated by the combination of the down-the-hole hammer and the core drill.

[0024] As an extended embodiment, in construction step 3), after the steel cage 300 is lowered to a predetermined depth, the steel cage 300 is fixed, and the steel cage 300 has an upper section 301 extending above the pile hole; In construction step 5), after the steel pipe tool column is lowered into the pile hole to a predetermined depth, the upper section 301 is connected to the steel pipe column 400 of the steel pipe tool column so that the steel reinforcement cage 300 and the steel pipe tool column are combined into a steel pipe reinforcement structure. The steel pipe reinforcement structure is then lowered into the pile hole until the bottom of the steel reinforcement cage 300 abuts against the bottom of the pile hole.

[0025] This facilitates the installation and positioning of the rebar cage 300 and the steel pipe tool column, and ensures that the rebar cage 300 and the steel pipe tool column are lowered synchronously.

[0026] As an extended embodiment, in construction step 5), the outer periphery of the steel pipe column 400 is provided with multiple upper hooks 401, which are arranged sequentially and at intervals along the circumference of the steel pipe column 400; the outer periphery of the upper section 301 is provided with multiple lower hooks 302, which are arranged sequentially and at intervals along the circumference of the upper section 301; the multiple upper hooks 401 and the multiple lower hooks 302 are respectively arranged vertically and vertically, and the upper hooks 401 and the lower hooks 302 are connected by connecting bars 403 so that the steel pipe tool column and the reinforcing cage 300 are connected as one unit.

[0027] By arranging multiple upper hooks 401 and multiple lower hooks 302, and connecting the upper hooks 401 and lower hooks 302 with connecting bars 403, the relative fixation between the rebar cage 300 and the steel pipe tool column is maintained, so that the rebar cage 300 and the steel pipe tool column can be lowered synchronously.

[0028] As an extended embodiment, in construction step 5), the upper end of the upper hook 401 is connected to the steel pipe column 400, and the lower end of the upper hook 401 is bent outward away from the steel pipe column 400 to form the lower end position 402; the lower end of the lower hook 302 is connected to the reinforcing cage 300, and the upper end of the lower hook 302 is arranged longitudinally to form the upper end position 303; the upper end position 303 and the lower end position 402 are arranged longitudinally and positively aligned, the upper end of the connecting bar 403 is connected to the lower end position 402, the lower end of the connecting bar 403 is connected to the upper end position 303, and the connecting bar 403 is arranged longitudinally.

[0029] The upper hook 401 is bent to form the lower end 402, keeping the lower end 402 and the upper end 303 aligned vertically. After the connecting bar 403 is connected to the upper end 303 and the lower end 402, it ensures the coaxial arrangement between the reinforcing cage 300 and the steel pipe tool column. Furthermore, during the process of lowering the reinforcing cage 300 and the steel pipe tool column, interference between the reinforcing cage 300 and the inner wall of the pile hole is avoided, thus preventing the cage from getting stuck.

[0030] As an extended embodiment, in construction step 5), the lifting equipment includes a main crane and an auxiliary crane. The main crane is connected to the top of the tool section 500 via a main lifting rope, and the auxiliary crane is connected to the outer periphery of the steel pipe column 400 via an auxiliary lifting rope. The main lifting rope and the auxiliary lifting rope lift upwards synchronously, and the lifting speed of the main lifting rope is greater than that of the auxiliary lifting rope, so that the steel pipe tool column changes from a horizontal position to an inclined position. When the tilt angle of the steel pipe tool column exceeds the set angle, the auxiliary lifting rope is detached from the steel pipe column by 400 degrees, and the main lifting rope is lifted independently upwards until the steel pipe tool column is arranged longitudinally.

[0031] By arranging the main lifting rope and the auxiliary lifting rope, the steel pipe tool column can be raised steadily during the lifting process, avoiding large lateral swaying and thus achieving stable lifting of the steel pipe tool column.

[0032] As an extended embodiment, in construction step 6), after the first concrete pour, the top of the lower concrete section 104 extends beyond the bottom of the lower section and above the reinforcing cage 300, thus ensuring that the entire reinforcing cage 300 is placed in the lower concrete section 104 to ensure the stability of the steel pipe pile.

[0033] As an extended embodiment, in construction step 4), a partition structure is provided on the outer periphery of the upper section, and the partition structure extends around the outer periphery of the upper section; the partition structure is provided with an elastically deformable annular cavity 602, and the annular cavity 602 extends around the circumference of the upper section. In construction step 6), after the first concrete pour, the concrete presses against the partition structure from bottom to top, and enters the annular cavity 602 from bottom to top, driving the annular cavity 602 to expand and deform elastically upward. In construction step 7), after the crushed stone section 106 is formed in the lower part of the upper ring gap 103, the bottom of the crushed stone section 106 presses against the partition structure, driving the annular cavity 602 to elastically compress and deform downwards. The partition structure restricts the crushed stone in the crushed stone section 106 from entering the lower concrete section 104.

[0034] The partition structure can prevent crushed stone from entering the lower concrete section 104 to avoid affecting the quality of the steel pipe pile; secondly, by forming an elastic annular cavity 602, during the formation of the crushed stone section 106, the crushed stone section 106 presses against the annular cavity 602, which allows the concrete in the annular cavity 602 to support the crushed stone section 106 in the opposite direction, further restricting the crushed stone from entering the lower concrete section 104.

[0035] As an extended embodiment, in construction step 4), the partition structure includes an elastic lower ring plate 600, which is arranged around the upper section in a circumferential manner. The lower ring plate 600 has multiple through holes arranged vertically. The inner end of the lower ring plate 600 is connected to the outer periphery of the upper section, the middle part of the lower ring plate 600 is bent downward and protruded, and the outer end of the lower ring plate 600 forms an outwardly curved ring 607, which abuts against the inner wall of the pile hole. The lower ring plate 600 is provided with an elastic upper ring plate 601, which is arranged around the upper section in a circumferential direction; the inner end of the upper ring plate 601 is connected to the lower ring plate 600, the middle part of the upper ring plate 601 is bent upward and protrudes, the outer end of the upper ring plate 601 is movably arranged and is spaced apart from the lower ring plate 600 to form an annular gap 603, and an annular cavity 602 is formed between the upper ring plate 601 and the lower ring plate 600; In construction step 6), after the first concrete pour, the concrete enters the annular cavity 602 through multiple through holes, fills the annular cavity 602, and drives the upper ring plate 601 to elastically deform upward, while the annular cavity 602 expands and deforms elastically in sync. In construction step 7), after the crushed stone section 106 is formed in the lower part of the upper ring interval 103, the bottom of the crushed stone section 106 presses against the upper ring plate 601, driving the upper ring plate 601 to deform elastically downward. The annular cavity 602 is simultaneously elastically compressed and deformed. The concrete in the annular cavity 602 is squeezed and squeezed out from the annular interval upward, supporting the crushed stone section 106 in the opposite direction.

[0036] Concrete enters the annular cavity 602 through multiple through holes. When the crushed stone section 106 presses against the annular cavity 602 and undergoes elastic compression deformation, the concrete in the annular cavity 602 flows out through the annular gap 603 and flows toward the inner wall of the pile hole, supporting the crushed stone section 106 in the opposite direction and restricting the crushed stone from entering the lower concrete section 104 through the outer curved ring 607 and the inner wall of the pile hole. Secondly, by forming an outer curved ring 607, which abuts against the inner wall of the pile hole in the opposite direction, the upward floating of the steel pipe tool column can be restricted. As an extended embodiment, in construction step 4), the upper ring plate 601 is provided with a plurality of vertically through strip holes 605, the plurality of strip holes 605 are arranged around the upper ring plate 601 at intervals in the circumference, and the strip holes 605 are arranged to extend radially along the upper ring plate 601. In construction step 7), during the process of forming the crushed stone section 106 at the lower part of the upper ring interval 103, the crushed stone section 106 presses the upper ring plate 601 downwards and elastically deforms downwards. The crushed stone at the bottom of the crushed stone section 106 is embedded in the annular cavity 602 through the strip hole 605. The concrete in the annular cavity 602 supports the crushed stone section 106 in the direction of the direction.

[0037] In this way, during the elastic compression deformation of the annular cavity 602, the concrete in the annular cavity 602 can be ensured to rise upwards in multiple directions, thereby achieving multi-position reverse support of the crushed stone section 106 and further restricting the crushed stone from entering the lower concrete section 104; secondly, by arranging multiple strip holes 605, the elastic deformation of the upper ring plate 601 is facilitated.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing steel pipe piles, characterized in that, The construction steps include the following: 1) Using a full-rotation drilling rig, a steel casing is lowered into the soil layer, and the soil in the steel casing is grabbed to form a soil hole in the soil layer, the bottom of which extends to the rock surface of the rock layer. 2) Drilling is carried out in the rock strata to form a rock strata hole, and the soil hole and the rock strata hole are connected vertically to form a pile hole; 3) Lower the reinforcing cage into the pile hole; 4) Provide a steel pipe column, the top of which is connected to a tool section. The steel pipe column and the tool section are arranged coaxially to form a steel pipe tool column. The bottom of the tool section has a butt joint section, and the outer periphery of the butt joint section is provided with multiple overflow holes. 5) Use lifting equipment to lift the horizontally arranged steel pipe tool column into a longitudinal arrangement, and then combine the steel pipe tool column with the reinforcing cage as one unit. The steel pipe tool column and the reinforcing cage are simultaneously lowered into the pile hole until the bottom of the reinforcing cage abuts against the bottom of the pile hole. When the bottom of the reinforcing cage abuts against the bottom of the pile hole, there is a bottom gap between the bottom of the steel pipe column and the bottom of the pile hole, and the top of the tool section is exposed above the pile hole. The lower part of the steel pipe column has a lower section, and the bottom of the lower section forms a bottom gap with the bottom of the pile hole. The lower section and the inner wall of the pile hole enclose each other to form an annular lower annular gap, and the reinforcing cage is surrounded in the lower annular gap. The upper part of the steel pipe column has an upper section, the bottom of which is connected to the top of the lower section, the tool section is connected to the top of the upper section, and there is an upper ring gap between the upper section and the inner wall of the pile hole. 6) Insert a guide pipe into the tool section. The guide pipe extends into the lower section. Concrete is poured for the first time through the guide pipe. The concrete is discharged through the bottom of the steel pipe column until the concrete fills the bottom gap, the interior of the lower section, and the lower ring gap, forming the lower concrete section. 7) Fill the lower part of the upper ring space with crushed stone to form crushed stone sections; 8) Pour concrete into the upper section through the guide pipe until the concrete fills the interior of the upper section, forming the upper concrete section; 9) After the concrete has solidified, the upper concrete section, the lower concrete section and the steel pipe column are combined to form a steel pipe pile. The tool section is then separated from the steel pipe column, and the tool section and the steel casing are pulled out of the soil. 10) Fill the upper part of the upper ring space with soil to form a soil segment that covers the top of the steel pipe column and extends to the top of the pile hole.

2. The steel pipe pile construction method as described in claim 1, characterized in that, In construction step 2), a down-the-hole hammer is used to drill a small-diameter hole in the rock stratum to form a hole, and a core drill is used to enlarge the small-diameter hole to form the rock stratum hole.

3. The steel pipe pile construction method as described in claim 1, characterized in that, In construction step 3), after the steel cage is lowered to a predetermined depth, the steel cage is fixed, and the steel cage has an upper section extending above the pile hole. In construction step 5), after the steel pipe tool column is lowered into the pile hole to a predetermined depth, the upper section is connected to the steel pipe column of the steel pipe tool column so that the steel reinforcement cage and the steel pipe tool column are combined into a steel pipe reinforcement structure. The steel pipe reinforcement structure is then lowered into the pile hole until the bottom of the steel reinforcement cage abuts against the bottom of the pile hole.

4. The steel pipe pile construction method as described in claim 3, characterized in that, In construction step 5), the outer periphery of the steel pipe column is provided with multiple upper hooks, which are arranged sequentially and at intervals along the circumference of the steel pipe column; the outer periphery of the upper section is provided with multiple lower hooks, which are arranged sequentially and at intervals along the circumference of the upper section; the multiple upper hooks and the multiple lower hooks are respectively arranged vertically and vertically, and the upper hooks and lower hooks are connected by connecting bars so that the steel pipe tool column and the reinforcing cage are connected as one unit.

5. The steel pipe pile construction method as described in claim 4, characterized in that, In construction step 5), the upper end of the upper hook is connected to the steel pipe column, and the lower end of the upper hook is bent outward away from the steel pipe column to form the lower end position; the lower end of the lower hook is connected to the reinforcing cage, and the upper end of the lower hook is arranged longitudinally to form the upper end position; the upper end position and the lower end position are arranged longitudinally and are aligned; the upper end of the connecting bar is connected to the lower end position, the lower end of the connecting bar is connected to the upper end position, and the connecting bar is arranged longitudinally.

6. The steel pipe pile construction method as described in claim 1, characterized in that, In construction step 5), the lifting equipment includes a main crane and an auxiliary crane. The main crane is connected to the top of the tool section via a main lifting rope, and the auxiliary crane is connected to the outer periphery of the steel pipe column via an auxiliary lifting rope. The main lifting rope and the auxiliary lifting rope lift upwards synchronously, and the lifting speed of the main lifting rope is greater than that of the auxiliary lifting rope, so that the steel pipe tool column changes from a horizontal position to an inclined position. When the tilt angle of the steel pipe tool column exceeds the set angle, the auxiliary lifting rope is detached from the steel pipe column, and the main lifting rope is lifted independently upwards until the steel pipe tool column is arranged longitudinally.

7. The steel pipe pile construction method as described in claim 1, characterized in that, In construction step 6), after the first concrete pour, the top of the lower concrete section extends beyond the bottom of the lower section and reaches above the reinforcing cage.

8. The steel pipe pile construction method according to any one of claims 1 to 7, characterized in that, In construction step 4), the upper section is provided with a partition structure on its outer periphery, and the partition structure extends around the outer periphery of the upper section; the partition structure is provided with an elastically deformable annular cavity, and the annular cavity extends around the circumference of the upper section. In construction step 6), after the first concrete pour, the concrete presses against the partition structure from bottom to top, and the concrete enters the annular cavity from bottom to top, driving the annular cavity to expand and deform elastically upward. In construction step 7), after a crushed stone segment is formed in the lower part of the upper annular space, the bottom of the crushed stone segment presses against the partition structure, driving the annular cavity to elastically compress and deform downwards. The partition structure restricts the crushed stone in the crushed stone segment from entering the lower concrete segment.

9. The steel pipe pile construction method as described in claim 8, characterized in that, In construction step 4), the partition structure includes an elastic lower ring plate, which is arranged around the circumference of the upper section. The lower ring plate has multiple through holes arranged vertically. The inner end of the lower ring plate is connected to the outer periphery of the upper section. The middle part of the lower ring plate is bent downward and protrudes. The outer end of the lower ring plate forms an outwardly curved ring, which abuts against the inner wall of the pile hole. The lower ring plate is provided with an elastic upper ring plate, which is arranged around the upper section in a circumferential direction; the inner end of the upper ring plate is connected to the lower ring plate, the middle part of the upper ring plate is bent upward and protrudes, the outer end of the upper ring plate is movably arranged and is spaced apart from the lower ring plate to form an annular gap, and the annular cavity is formed between the upper ring plate and the lower ring plate. In construction step 6), after the first concrete pour, the concrete enters the annular cavity through multiple through holes, fills the annular cavity, and drives the upper ring plate to elastically deform upward, while the annular cavity expands and deforms elastically in sync. In construction step 7), after the crushed stone segment is formed in the lower part of the upper ring interval, the bottom of the crushed stone segment presses against the upper ring plate, driving the upper ring plate to deform elastically downward. The annular cavity is simultaneously elastically compressed and deformed, and the concrete in the annular cavity is squeezed out from the annular interval upward, supporting the crushed stone segment in the opposite direction.

10. The steel pipe pile construction method as described in claim 9, characterized in that, In construction step 4), the upper ring plate is provided with a plurality of vertically through strip holes, the plurality of strip holes are arranged at intervals around the upper ring plate in the circumferential direction, and the strip holes are arranged in the radial direction of the upper ring plate. In construction step 7), during the process of forming a crushed stone segment at the lower part of the upper ring space, the crushed stone segment is pressed downwards and the upper ring plate is elastically deformed downwards. The crushed stone at the bottom of the crushed stone segment is embedded in the annular cavity through the strip hole, and the concrete in the annular cavity supports the crushed stone segment in the direction of the direction.

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