Seismic-resistant bridge pile foundation and pile foundation construction method

Abstract

The present invention provides an earthquake-resistant bridge pile foundation, comprising a pile body made of at least one group of protective tubes, wherein a pedestal is cast on the upper end surface of the pile body, and a pedestal base is cast on the lower end surface of the pile body, and a steel cage is arranged inside the pile body, the protective tube comprises a protective tube body, a fixing groove and a connecting groove, the fixing groove is arranged on the upper end surface of the protective tube body, and the connecting groove is arranged on the inner wall of the fixing groove; the pedestal base comprises a fixing seat body, a casting groove, a support reinforcement groove, a main reinforcement groove and an anchor column, the casting groove is arranged on the upper end surface of the fixing seat body, the support reinforcement groove and the main reinforcement groove are both arranged at the bottom of the casting groove, and the anchor column is fixedly connected to the lower end surface of the fixing seat body; the steel cage comprises main reinforcement, connecting rings, cast annular reinforcement, connecting annular reinforcement, support reinforcement and metal rods. The present invention performs splicing and connection by the steel cage during casting, and protects the steel cage by the protective tube, thereby effectively improving the strength of the pile foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pile foundations, in particular to an earthquake-resistant bridge pile foundation and a pile foundation construction method. Background Art

[0002] A deep foundation consisting of a pile and a pile cap connected to the top of the pile (referred to as the cap), or a single pile foundation consisting of a column connected to the pile base, is referred to as a pile foundation. If the pile is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low-cap pile foundation. If the upper part of the pile is exposed to the ground and the bottom of the cap is above ground, it is called a high-cap pile foundation. Building pile foundations are generally low-cap pile foundations. Pile foundations are widely used in high-rise buildings. Similarly, pile foundations are often used for support in bridge construction.

[0003] The locations where existing bridge pile foundations are set up have high water content. Steel casings need to be set up first when pouring the pile foundations. In addition, the steel cages of the pile foundations are generally very long. Therefore, it is very inconvenient to directly place the steel cages in the pile foundation pit for pouring. In addition, the pile foundations directly cast with the steel cages are affected by the water impact at the bridge location, and their own lifespan will be seriously reduced. In addition, the pouring environment is not suitable for the solidification of concrete, resulting in low strength of the pile foundations. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides an earthquake-resistant bridge pile foundation and a pile foundation construction method to solve the problems raised in the above background technology.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an earthquake-resistant bridge pile foundation, comprising a pile body made of at least one set of protective tubes, a cap cast on the upper end surface of the pile body, a cap base cast on the lower end surface of the pile body, a steel cage disposed inside the pile body, the protective tube comprising a protective tube body, a fixing groove, and a connecting groove, the fixing groove being provided on the upper end surface of the protective tube body, and the connecting groove being provided on the inner wall of the fixing groove;

[0008] The cap base includes a fixed seat body, a casting groove, a support rib groove, a main rib groove and an anchor column, the casting groove is provided on the upper end surface of the fixed seat body, the support rib groove and the main rib groove are both provided at the bottom of the casting groove, and the anchor column is fixedly connected to the lower end surface of the fixed seat body;

[0009] The steel cage includes main reinforcement, connecting rings, cast annular reinforcement, connecting annular reinforcement, support reinforcement and metal rods. The connecting rings have at least one group slidingly connected to the side end face of the main reinforcement, and a total of four groups of support reinforcements are symmetrically fixedly connected to the side end face of the connecting rings. The cast annular reinforcement and the connecting annular reinforcement are both fixedly connected to the connecting rings by metal rods, and the support reinforcement is arranged on the inner side wall of the cast annular reinforcement.

[0010] As a further preference, at least one group of supporting steel bars is provided on the lower end surface of the protection tube, and the height of the supporting steel bars on the lower end surface of the protection tube is 2-3 cm higher than the depth of the fixing groove.

[0011] As a further preference, a fixing groove is provided on the upper end surface of the fixing seat body, the fixing groove frames the casting groove inside, and the connecting groove provided inside the fixing groove is connected to the casting groove.

[0012] As a further preference, one end of the support rib is arranged inside the support rib groove, and one end of the main rib is arranged inside the main rib groove.

[0013] As a further preference, the at least one group of connecting rings are spaced apart on the side end face of the main reinforcement, and adjacent connecting rings are rotated 45°, and the connection points between the metal rod and the cast annular reinforcement are connected together with the support reinforcement through steel wires.

[0014] As a further preference, the connecting annular reinforcement is arranged inside the fixing groove, and the metal rod passes through the connecting groove.

[0015] Also included is a construction method for earthquake-resistant bridge pile foundations, comprising the following steps:

[0016] S1: Positioning measurement to determine the position of the pile foundation, and casting the protective tube and the cap base through the mold while positioning;

[0017] S2: Drilling, using a drilling rig to drill out the pouring pit for the pile foundation;

[0018] S3: Clean up the debris, remove the water in the casting pit, and clean the inner wall of the casting pit;

[0019] S4: Install the cap base to the bottom of the installation pit, and insert the anchor column into the soil at the bottom of the casting pit;

[0020] S5: Insert one end of the main reinforcement into the main reinforcement groove, insert one end of the support reinforcement into the support reinforcement groove, wrap the connecting ring reinforcement around the main reinforcement and the support reinforcement and place them in the fixing groove on the upper end face of the cap base, connect the cast ring reinforcement between the four sets of metal rods on the connecting ring, then wrap the connecting ring with the cast ring reinforcement around the side end face of the main reinforcement, and wrap the cast ring reinforcement around the support reinforcement and slide it along the main reinforcement until the end of the metal rod facing away from the connecting ring slides through the connecting groove into the fixing groove, and tie the metal rod and the connecting ring reinforcement tightly with steel wire;

[0021] S6: The protective tube is wrapped around the main reinforcement and the support reinforcement, so that the supporting reinforcement on the lower end face of the protective tube enters the interior of the fixing groove provided with the connecting ring reinforcement, and then concrete is poured into the interior of the protective tube. When the concrete is flush with the bottom of the connecting groove on the protective tube, the connecting ring reinforcement is wrapped around the main reinforcement and the support reinforcement and placed into the interior of the fixing groove on the upper end face of the protective tube, and the cast ring reinforcement is connected between the four sets of metal rods on the connecting ring. Then, the connecting ring with the cast ring reinforcement is wrapped around the side end face of the main reinforcement, and the cast ring reinforcement is wrapped around the support reinforcement and slid along the main reinforcement until the end of the metal rod away from the connecting ring slides through the connecting groove into the interior of the fixing groove, and the metal rod and the connecting ring reinforcement are tied tightly with steel wire;

[0022] S7: Repeat step S6 until the last set of protective tubes is set on the ground, and then the foundation is poured with concrete.

[0023] S8: Carry out concrete curing on the poured pile foundation.

[0024] (3) Beneficial effects

[0025] The present invention provides an earthquake-resistant bridge pile foundation and a pile foundation construction method, which have the following beneficial effects:

[0026] 1. Prefabricate the protective tube and the cap base through the model, so that the steel cage does not need to be tied directly. When pouring the pile foundation, it can be poured layer by layer, making the operation easier when pouring the pile foundation. Compared with the direct placement of the steel cage, the pile foundation is also safer.

[0027] 2. The protective tube and the pedestal base, as well as the protective tubes and the protective tubes, are connected by inserting supporting steel bars into the fixed groove, and the connecting ring steel bars on the steel cage are arranged inside the fixed groove, so that the protective tube, the pedestal base and the steel cage form a whole when cast together, so that the stability of the pile foundation is also higher. At the same time, the protective tube has a protective effect on the steel cage, and the cement pile formed by the casting of the steel cage will also be protected by the protective tube. In this way, the cement pile formed by the casting of the steel cage does not directly contact the groundwater, which effectively improves the service life of the steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the earthquake-resistant bridge pile foundation structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the front view structure of the earthquake-resistant bridge pile foundation of the present invention;

[0030] Figure 3 This is a schematic diagram of the protective tube structure of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the platform base of the present invention;

[0032] Figure 5 It is a schematic diagram of the steel cage structure of the present invention;

[0033] Figure 6 It is a schematic diagram of the connecting ring structure of the present invention.

[0034] In the figure: 1 pedestal, 2 protective tube, 3 pedestal base, 4 steel cage, 5 protective tube body, 6 fixing groove, 7 connecting groove, 8 fixing seat body, 9 casting groove, 10 support reinforcement groove, 11 main reinforcement groove, 12 anchor column, 13 main reinforcement, 14 connecting ring, 15 cast ring reinforcement, 16 connecting ring reinforcement, 17 support reinforcement, 18 metal rod. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] An embodiment of the present invention provides an earthquake-resistant bridge pile foundation, comprising a pile body made of at least one set of protective tubes 2, a cap 1 cast on the upper end surface of the pile body, a cap base 3 cast on the lower end surface of the pile body, a steel cage 4 disposed inside the pile body, the protective tube 2 comprising a protective tube body 5, a fixing groove 6, and a connecting groove 7, the fixing groove 6 being provided on the upper end surface of the protective tube body 5, and the connecting groove 7 being provided on the inner wall of the fixing groove 6;

[0041] The cap base 3 includes a fixed seat body 8, a casting groove 9, a support reinforcement groove 10, a main reinforcement groove 11 and an anchor column 12. The casting groove 9 is provided on the upper end surface of the fixed seat body 8, the support reinforcement groove 10 and the main reinforcement groove 11 are both provided at the bottom of the casting groove 9, and the anchor column 12 is fixedly connected to the lower end surface of the fixed seat body 8;

[0042] The steel cage 4 includes main reinforcement 13, connecting rings 14, cast annular reinforcement 15, connecting annular reinforcement 16, support reinforcement 17 and metal rods 18. The connecting rings 14 have at least one group slidingly connected to the side end face of the main reinforcement 13, and a total of four groups of support reinforcement 17 are symmetrically fixedly connected to the side end face of the connecting rings 14. The cast annular reinforcement 15 and the connecting annular reinforcement 16 are fixedly connected to the connecting rings 14 through metal rods 18, and the support reinforcement 17 is arranged on the inner wall of the cast annular reinforcement 15.

[0043] In this embodiment, at least one group of supporting steel bars is provided on the lower end surface of the protective tube 2. The height of the supporting steel bars on the lower end surface of the protective tube 2 is 2-3 cm higher than the depth of the fixing groove 6. The supporting steel bars enable the protective tubes 2 and the protective tubes 2 as well as the protective tubes 2 and the pedestal base 3 to be connected together when pouring concrete.

[0044] Specifically, a fixing groove 6 is provided on the upper end surface of the fixing seat body 8, and the fixing groove 6 frames the casting groove 9 inside. The connecting groove 7 provided inside the fixing groove 6 is connected to the casting groove 9. By providing the fixing groove 6 on the pedestal base 3, the protective tube 2 and the pedestal base 3 can be conveniently connected to each other.

[0045] In this embodiment, one end of the support bar 17 is set inside the support bar groove 10, and one end of the main bar 13 is set inside the main bar groove 11. The casting trough 9 sets the steel cage 4 inside through the support bar groove 10 and the main bar groove 11.

[0046] Among them, the main reinforcement 13, cast annular reinforcement 15 and support reinforcement 17 on the steel cage 4 are covered inside by the protective tube 2, so that when the protective tube 2 and the steel cage 4 are poured with concrete, the protective tube 2 is a constraint on the steel cage 4. At the same time, the protective tube 2 has a certain protective effect on the steel cage 4. After the concrete is poured, the steel cage 4 cooperates with the protective tube 2, and the structural strength is higher.

[0047] In this embodiment, at least one group of connecting rings 14 are arranged at intervals on the side end surface of the main reinforcement 13, and the adjacent connecting rings 14 are rotated 45°. The connection points of the metal rod 18 and the cast annular reinforcement 15 are connected together through steel wires and support bars 17, where there are eight groups of support bars 17, and the eight groups of support bars 17 are symmetrically arranged on the inner wall of the cast annular reinforcement 15.

[0048] Among them, two groups of metal rods 18 of the four groups of metal rods 18 on the connecting ring 14 are separated from each other and are above the cast annular steel bars 15, and the other two groups of metal rods 18 are below the cast annular steel bars 15, so that the metal rods 18 are connected and fastened to the cast annular steel bars 15. At the same time, the connection points between the metal rods 18 and the cast annular steel bars 15 are passed through by support bars 17, so that the cast annular steel bars 15, the support bars 17 and the metal rods 18 are tightened by steel wire.

[0049] In this embodiment, the connecting annular steel bar 16 is arranged inside the fixed groove 6, and the metal rod 18 passes through the connecting groove 7. The metal rod 18 passes through the connecting groove 7 and enters the fixed groove 6 and is tightened with the connecting annular steel bar 16 by steel wire. In this way, when pouring concrete into the steel cage 4, the protective tube 2, the base 3 and the steel cage 4 will be cast together.

[0050] The present invention also provides a construction method for an earthquake-resistant bridge pile foundation, comprising the following steps:

[0051] S1: Positioning measurement to determine the position of the pile foundation, and casting the protective tube 2 and the cap base 3 through the mold during positioning;

[0052] S2: Drilling, using a drilling rig to drill out the pouring pit for the pile foundation;

[0053] S3: Clean up the debris, remove the water in the casting pit, and clean the inner wall of the casting pit;

[0054] S4: Install the cap base 3 to the bottom of the installation pit, and insert the anchor column 12 into the soil at the bottom of the casting pit;

[0055] S5: Insert one end of the main reinforcement 13 into the main reinforcement groove 11, insert one end of the support reinforcement 17 into the support reinforcement groove 10, put the connecting ring reinforcement 16 around the main reinforcement 13 and the support reinforcement 17 and place them in the fixing groove 6 on the upper end surface of the base 3, connect the cast ring reinforcement 15 between the four groups of metal rods 18 on the connecting ring 14, then put the connecting ring 14 with the cast ring reinforcement 15 around the side end surface of the main reinforcement 13, and slide the cast ring reinforcement 15 around the support reinforcement 17 along the main reinforcement 13 until the end of the metal rod 18 away from the connecting ring 14 slides into the fixing groove 6 through the connecting groove 7, and fasten the metal rod 18 to the connecting ring reinforcement 16 with a steel wire;

[0056] S6: Put the protective tube 2 over the main reinforcement 13 and the support reinforcement 17, so that the supporting reinforcement on the lower end face of the protective tube 2 enters the fixed groove 6 provided with the connecting ring reinforcement 16, and then pour concrete into the protective tube 2. When the concrete is flush with the bottom of the connecting groove 7 on the protective tube 2, put the connecting ring reinforcement 16 over the main reinforcement 13 and the support reinforcement 17 and place them in the fixed groove 6 on the upper end face of the protective tube 2, connect the cast ring reinforcement 15 between the four groups of metal rods 18 on the connecting ring 14, and then put the connecting ring 14 with the cast ring reinforcement 15 over the side end face of the main reinforcement 13, and put the cast ring reinforcement 15 over the support reinforcement 17 and slide along the main reinforcement 13 until the end of the metal rod 18 away from the connecting ring 14 slides into the fixed groove 6 through the connecting groove 7, and fastens the metal rod 18 to the connecting ring reinforcement 16 with a steel wire;

[0057] S7: Repeat step S6 until the last set of protective tubes 2 is set on the ground, and then pour concrete into the foundation 1.

[0058] S8: Carry out concrete curing on the poured pile foundation.

[0059] In summary, the present invention provides an earthquake-resistant bridge pile foundation, which prefabricates the protective tube 2 and the pedestal base 3 through the model, so that the steel cage 4 does not need to be directly tied and can be poured layer by layer during the pile foundation pouring, making the operation simpler during the pile foundation pouring and safer than the pile foundation pouring with the steel cage directly placed.

[0060] Secondly, the protective tube 2 and the pedestal base 3 and the protective tubes 2 and the protective tubes 2 are connected by inserting supporting steel bars into the fixed groove 6, and the connecting annular steel bars 16 on the steel cage 4 are arranged inside the fixed groove 6, so that the protective tube 2, the pedestal base 3 and the steel cage 4 will form a whole when cast together, so that the stability of the pile foundation is also higher. At the same time, the protective tube 2 has a protective effect on the steel cage 4, and the cement pile formed by the casting of the steel cage 4 will also be protected by the protective tube 2. In this way, the cement pile formed by the casting of the steel cage 4 does not directly contact the groundwater, effectively improving the service life of the steel cage 4.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An earthquake-resistant bridge pile foundation, comprising a pile body made of at least one set of protective tubes (2), a cap (1) provided on the upper end surface of the pile body, a cap base (3) provided on the lower end surface of the pile body, and a steel cage (4) provided inside the pile body, characterized in that: The protective tube (2) comprises a protective tube body (5), a fixing groove (6) and a connecting groove (7), wherein the fixing groove (6) is provided on the upper end surface of the protective tube body (5), and the connecting groove (7) is provided on the inner wall of the fixing groove (6); The pedestal base (3) comprises a fixed seat body (8), a casting trough (9), a support rib groove (10), a main rib groove (11) and an anchor column (12); the casting trough (9) is provided on the upper end surface of the fixed seat body (8); the support rib groove (10) and the main rib groove (11) are both provided at the bottom of the casting trough (9); and the anchor column (12) is fixedly connected to the lower end surface of the fixed seat body (8); The steel cage (4) comprises a main reinforcement (13), a connecting ring (14), a cast annular reinforcement (15), a connecting annular reinforcement (16), a support reinforcement (17) and a metal rod (18), at least one group of the connecting ring (14) is slidably connected to the side end face of the main reinforcement (13), and there are four groups of the metal rods (18), and the four groups of the metal rods (18) are symmetrically fixedly connected to the side end face of the connecting ring (14), the cast annular reinforcement (15) and the connecting annular reinforcement (16) are both fixedly connected to the connecting ring (14) through the metal rod (18), and the support reinforcement (17) is arranged on the inner side wall of the cast annular reinforcement (15); A fixing groove (6) is provided on the upper end surface of the fixing seat body (8), the fixing groove (6) frames the casting groove (9) inside, and the connecting groove (7) provided inside the fixing groove (6) is connected to the casting groove (9).

2. The earthquake-resistant bridge pile foundation according to claim 1, characterized in that: The lower end surface of the protection tube (2) is provided with at least one group of supporting steel bars.

3. The earthquake-resistant bridge pile foundation according to claim 1, characterized in that: One end of the support rib (17) is arranged inside the support rib groove (10), and one end of the main rib (13) is arranged inside the main rib groove (11).

4. The earthquake-resistant bridge pile foundation according to claim 1, characterized in that: At least one group of the connecting rings (14) is arranged at intervals on the side end surface of the main reinforcement (13), and adjacent connecting rings (14) are staggered by 45 degrees. The connection points of the metal rod (18) and the cast annular reinforcement (15) are connected together through steel wires and support reinforcements (17).

5. The earthquake-resistant bridge pile foundation according to claim 1, characterized in that: The connecting annular reinforcement bar (16) is arranged inside the fixing groove (6), and the metal rod (18) passes through the connecting groove (7).

6. A construction method for earthquake-resistant bridge pile foundation according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Positioning measurement to determine the position of the pile foundation, and casting the protective tube (2) and the base of the pile cap (3) through the mold while positioning; S2: Drilling, using a drilling rig to drill out the pouring pit for the pile foundation; S3: Clean up the debris, remove the water in the casting pit, and clean the inner wall of the casting pit; S4: Install the cap base (3) to the bottom of the installation pit, and insert the anchor column (12) into the soil at the bottom of the casting pit; S5: insert one end of the main reinforcement (13) into the main reinforcement groove (11), insert one end of the support reinforcement (17) into the support reinforcement groove (10), put the connecting annular reinforcement (16) around the main reinforcement (13) and the support reinforcement (17) into the fixing groove (6) on the upper end face of the pedestal base (3), connect the cast annular reinforcement (15) to the four groups of metal rods (18) on the connecting ring (14), then put the connecting ring (14) with the cast annular reinforcement (15) around the side end face of the main reinforcement (13), and put the cast annular reinforcement (15) around the support reinforcement (17) and slide along the main reinforcement (13) until the end of the metal rod (18) away from the connecting ring (14) slides into the fixing groove (6) through the connecting groove (7), and fastens the metal rod (18) and the connecting annular reinforcement (16) with a steel wire; S6: The protective tube (2) is covered with the main reinforcement (13) and the support reinforcement (17), so that the supporting reinforcement on the lower end surface of the protective tube (2) enters the interior of the fixing groove (6) provided with the connecting ring reinforcement (16), and then concrete is poured into the interior of the protective tube (2). When the concrete is flush with the bottom of the connecting groove (7) on the protective tube (2), the connecting ring reinforcement (16) is covered with the main reinforcement (13) and the support reinforcement (17) and placed in the interior of the fixing groove (6) on the upper end surface of the protective tube (2). The ribs (15) are connected between the four groups of metal rods (18) on the connecting ring (14), and then the connecting ring (14) with the cast annular reinforcement (15) is placed on the side end surface of the main reinforcement (13), and the cast annular reinforcement (15) is placed on the support reinforcement (17) and slid along the main reinforcement (13) until the end of the metal rod (18) away from the connecting ring (14) slides into the inside of the fixing groove (6) through the connecting groove (7), and the metal rod (18) and the connecting annular reinforcement (16) are tied tightly by steel wire; S7: Repeat step S6 until the last set of protective cylinders (2) is set on the ground, and then the foundation (1) is poured with concrete; S8: Carry out concrete curing on the poured pile foundation.

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