Prefabricated pier column connecting joint for circular single pile and construction method

Abstract

The invention discloses a prefabricated pier column connecting node for a circular single pile and a construction method, and belongs to the technical field of pier column connecting nodes, the connecting node comprises a pier column arranged in a cylindrical shape and a pile foundation fixedly connected with the pier column, and the connecting node is characterized in that the pier column is formed by pouring high-toughness concrete; a plurality of prestressed steel strands extending along the axis of the pier column are arranged in the pier column, a plastic hinge area is arranged at the bottom of the pier column, energy dissipation steel bars are arranged in the plastic hinge area of the pier column, a pile foundation expansion section coaxial with the pile foundation is arranged on the pile foundation, and the diameter of the pile foundation expansion section is larger than that of the pile foundation. A steel sleeve is arranged on the outer surface of the pile foundation expansion section, a socket section is arranged on the pile foundation expansion section, after concrete is poured to form the pile foundation expansion section, the pier column is hoisted into the steel sleeve, and then high-toughness concrete is poured into the steel sleeve to form the socket section connected with the pile foundation expansion section, so that the pier column is connected with the pile foundation. According to the invention, earthquake energy can be effectively dissipated.

Description

Technical Field

[0001] The invention belongs to the technical field of pier column connection nodes, and in particular relates to a prefabricated pier column connection node for a circular single pile and a construction method. Background Art

[0002] Bridges are the hubs connecting cities and regions, and the rescue channels for post-earthquake rescue and disaster relief. If a bridge collapses or is seriously damaged in an earthquake, it will threaten the safety of pedestrians, vehicles and other traffic participants, and will also hinder rescue and reconstruction work in the disaster area, resulting in serious economic losses and casualties.

[0003] Most bridge piers in the world are reinforced concrete piers designed based on ductility. Piers designed according to this concept can undergo plastic deformation under earthquakes to avoid brittle failure or even collapse. The ductility-based design concept allows plastic hinges to be generated at the bottom of the piers under earthquakes, dissipating earthquake energy through the deformation of the plastic hinges. The generation of plastic hinges can also reduce the stiffness of the piers, extend the basic period of the piers, and thus reduce earthquake damage. However, due to the plastic deformation of the plastic hinges, the residual displacement of reinforced concrete piers based on the ductility design concept is too large after the earthquake. Large residual displacement often makes repair difficult or even impossible, and requires demolition and reconstruction, which will consume a lot of time and money.

[0004] In order to speed up bridge construction and improve the constructability and safety of bridges in complex environments, the application of rapid bridge construction technology with factory prefabrication and on-site assembly has become more and more widespread in recent years. Bored piles are often used in high-intensity mountainous areas with complex geological conditions. Due to the special structure of prefabricated pile-column bridge piers, there is no cap between the pile foundation and the pier column, and the cross-sectional dimensions of the pier column are inconsistent with the cross-sectional dimensions of the pile foundation. How to solve the connection problem of prefabricated pile-column bridge piers is particularly important. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a prefabricated pier connection node and construction method for a circular single pile, in which the prestressed steel strands in the pier can provide reset capability and reduce the residual displacement of the pier when an earthquake occurs, and the energy-absorbing steel bars in the pier can dissipate the seismic energy.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a prefabricated pier column connection node for a circular single pile, comprising a pier column arranged in a cylindrical shape and a pile foundation fixedly connected to the pier column, wherein the pier column is cast by high-toughness concrete, a plurality of prestressed steel strands extending along the axis of the pier column are arranged in the pier column, the prestressed steel strands are pre-tensioned bonded steel strands, the bottom of the pier column is arranged as a plastic hinge area, the pier column is provided with energy-absorbing steel bars in the plastic hinge area, a pile foundation expansion section arranged coaxially with the pile foundation is arranged on the pile foundation, the diameter of the pile foundation expansion section is larger than the diameter of the pile foundation, a steel sleeve is arranged on the outer surface of the pile foundation expansion section, and a socket section is arranged on the pile foundation expansion section, after pouring concrete to form the pile foundation expansion section, the pier column is hoisted into the steel sleeve, and then high-toughness concrete is poured into the steel sleeve to form the socket section connected to the pile foundation expansion section, so that the pier column is connected to the pile foundation.

[0008] Furthermore, the pier is provided with spiral stirrups spirally arranged along the axis of the pier, and a plurality of stand bars axially arranged in the direction of the axis of the pier, the stand bars are tied and fixed to the spiral stirrups, the energy-absorbing steel bars are tied and fixed to the spiral stirrups, and the prestressed steel strands are arranged on the inner sides of the plurality of stand bars.

[0009] Furthermore, on the outer wall of the pier extending to the socket section, teeth and keys surrounding the pier are arranged side by side along the axis of the pier.

[0010] Furthermore, a pile foundation steel cage and pile foundation main bars tied and fixed to the pile foundation steel cage are arranged in the pile foundation, a plurality of pile foundation main bars are arranged circumferentially with the pile foundation axis as the center, a plurality of expanded section steel bars are arranged circumferentially with the pile foundation expanded section axis as the center, the pile foundation main bars are arranged in the inner circle of the expanded section steel bars, and the pier column is arranged in the inner circle of the pile foundation main bars.

[0011] Furthermore, the pile foundation expansion section is connected with a ground tie beam, and the ground tie beam is provided with main reinforcement of the ground tie beam. The main reinforcement of the ground tie beam is inserted into the pile foundation expansion section and is located below the socket section. The steel sleeve is provided with reserved holes for the main reinforcement of the ground tie beam to pass through. After the main reinforcement of the ground tie beam is inserted into the reserved holes of the steel sleeve, concrete is poured into the steel sleeve to cover the main reinforcement of the ground tie beam to form the pile foundation expansion section, the pier is hoisted onto the pile foundation expansion section, and then high-toughness concrete is poured to form the socket section so that the pier and the pile foundation are connected as one.

[0012] Furthermore, an energy absorbing plate arranged in a U shape is connected between the pier and the socket section, and multiple energy absorbing plates are circumferentially arranged with the pier axis as the center, the first arm of the energy absorbing plate vertically extends into the pier, the second arm of the energy absorbing plate vertically extends into the socket section, the arc section of the energy absorbing plate is arranged in the pile foundation expansion section, and a socket for inserting the energy absorbing plate is reserved in the pier, and multiple energy absorbing components arranged vertically side by side are fixedly connected between the two arms of the energy absorbing plate, and the energy absorbing component includes a sleeve in the middle of the interior, and two slides are connected in a limited sliding friction manner in the sleeve, and a spring in a compressed state is fixedly connected between the two slides, and a connecting rod is fixedly connected to the slide, and the two connecting rods are respectively extended in opposite directions from the sleeve and fixedly connected with threaded rods, and the ends of the threaded rods close to the sleeve are abutted against the ends of the sleeve, and a threaded hole matching the threaded rod is provided on the energy absorbing plate, and the threaded rod is threadedly connected to the threaded hole.

[0013] Furthermore, a radial hole is radially arranged in the pier column and is connected to the insertion hole in a one-to-one manner. The radial hole is coaxially arranged with the threaded hole. The sleeve is plugged into the radial hole. A groove is coaxially arranged with the threaded hole. The energy dissipation plate is provided with a groove, wherein the diameter of the groove on the first arm of the energy dissipation plate is larger than the diameter of the threaded hole, and the diameter of the groove on the second arm of the energy dissipation plate is smaller than the diameter of the threaded hole.

[0014] A construction method for a prefabricated pier column connection node for a circular monopile, comprising the following steps:

[0015] S1: Precast piers by pouring high-toughness concrete;

[0016] S2: excavate a pile hole at the construction site, and place the steel sleeve, pile foundation steel cage, pile foundation expansion section steel cage and steel sleeve into the pile hole;

[0017] S3: Insert the main reinforcement of the ground tie beam from the reserved hole of the steel sleeve to the pile foundation expansion section, cast the pile foundation expansion section, pile foundation and ground tie beam, and realize the connection of the pile foundation expansion section, pile foundation and ground tie beam;

[0018] S4: After the pile foundation expansion section, pile foundation and ground tie beam reach the preset strength, the pier column is hoisted to the inner side of the main reinforcement of the pile foundation;

[0019] S5: Pour high-toughness concrete in the steel sleeve to form a socket section that is integrated with the pile foundation expansion section, so that the pier column is connected to the pile foundation expansion section.

[0020] Furthermore, a construction method for a prefabricated pier column connection node for a circular monopile comprises the following steps:

[0021] A1: Prefabricated piers are cast with high-toughness concrete, where sockets and radial holes are reserved.

[0022] A2: Dig a pile hole at the construction site, put the steel sleeve, pile foundation steel cage, pile foundation expansion section steel cage and steel sleeve into the pile hole, and fix the energy dissipation plate in the steel sleeve;

[0023] A3: Insert the main reinforcement of the ground tie beam from the reserved hole of the steel sleeve to the pile foundation expansion section, cast the pile foundation expansion section, pile foundation and ground tie beam, and realize the connection of the pile foundation expansion section, pile foundation and ground tie beam, in which concrete is poured to cover the arc section of the energy dissipation plate;

[0024] A4: After the pile foundation expansion section, pile foundation and ground tie beam reach the preset strength, the pier column is hoisted to the inner side of the main reinforcement of the pile foundation, and the first arms of the multiple energy dissipation plates are respectively inserted into the corresponding sockets;

[0025] A5: Fix the energy dissipation assembly between the two arms of the energy dissipation plate, wherein the threaded rods at both ends of the sleeve are respectively threadedly connected with the threaded holes of the two arms of the energy dissipation plate 20, and the two ends of the sleeve are against the groove;

[0026] A6: Pour high-toughness concrete in the steel sleeve to form a socket section that is integrated with the pile foundation expansion section, so that the pier column is connected to the pile foundation expansion section; wherein, the high-toughness concrete wraps the energy-absorbing plate and the energy-absorbing components.

[0027] The beneficial effects of the present invention are as follows: under normal use, the connection node between the prefabricated pier column and the pile foundation is equivalent to a cast-in-place node; when an earthquake occurs, the prestressed steel strands in the pier column can provide a reset capability to reduce the residual displacement of the pier column, and the energy-absorbing steel bars in the pier column can play a role in dissipating earthquake energy; the construction method of prefabricating the pier column in the factory and hoisting it on site can effectively shorten the construction period and achieve the effect of rapid construction.

[0028] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the pier column structure according to the first embodiment of the present invention;

[0032] Figure 3 For the first embodiment of the present invention Figure 2 Schematic diagram of the cross section of the middle section aa;

[0033] Figure 4 For the first embodiment of the present invention Figure 2 Schematic diagram of the cross section of the middle section bb;

[0034] Figure 5 It is a schematic diagram of the connection between the pier column and the socket section, the pile foundation and the pile foundation expansion section according to the first embodiment of the present invention;

[0035] Figure 6 For the first embodiment of the present invention Figure 5 Schematic diagram of the cross section of the middle section cc;

[0036] Figure 7 It is a cross-sectional view of the socket section of the first embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the connection between the ground tie beam and the pile foundation expansion section according to the first embodiment of the present invention;

[0038] Fig. 9 This is a schematic diagram of the installation of the energy-consuming board and energy-consuming components according to the second embodiment of the present invention;

[0039] Fig.10 It is a cross-sectional view of the installation structure of the energy-consuming component of the second embodiment of the present invention.

[0040] The markings in the attached drawings are as follows: pier 1, socket 101, radial hole 102, prestressed steel strand 2, socket section 3, steel sleeve 4, expanded section steel bar 5, pile foundation 6, pile foundation main bar 7, ground beam 8, ground beam main bar 9, anchor 10, energy-absorbing steel bar 11, spiral stirrups 12, high-toughness concrete 13, pile foundation expanded section 14, tooth key 15, pile foundation steel bar cage 16, ground beam steel bar cage 17, expanded section steel bar cage 18, frame bar 19, energy-absorbing plate 20, casing 21, slide plate 22, spring 23, connecting rod 24, threaded rod 25, threaded hole 26, groove 27. DETAILED DESCRIPTION

[0041] Embodiment 1, as Figures 1 to 8As shown, the present invention provides a prefabricated pier column connection node for a circular single pile, comprising: a pier column 1 arranged in a cylindrical shape and a pile foundation 6 fixedly connected to the pier column 1, the pier column 1 is prefabricated by pouring high-toughness concrete 13, the pier column 1 is provided with a spiral stirrup 12 spirally arranged along the axis of the pier column 1, and a plurality of frame bars 19 circumferentially arranged in the direction of the axis of the pier column 1, the frame bars 19 are tied and fixed with the spiral stirrup 12, the spiral stirrup 12 and the frame bars 19 are tied together and arranged along the entire length of the pier column, a plurality of prestressed steel strands 2 extending along the axial direction of the pier column 1 are arranged in the middle array in the pier column 1, the prestressed steel strands 2 are pre-tensioned bonded steel strands, a plastic hinge area is provided at the bottom of the pier column 1, and the pier column 1 is plastically hinged. An energy-absorbing steel bar 11 is provided in the hinge area to effectively dissipate seismic energy. An anchor 10 anchored to the energy-absorbing steel bar 11 is provided at the bottom of the pier 1. The anchor 10 is arranged inside the pier 1 and wrapped by high-toughness concrete 13 to prevent the lower end of the prestressed steel strand 2 from bonding and slipping. The pile foundation 6 is provided with a pile foundation expansion section 14 coaxially arranged with the pile foundation 6. The diameter of the pile foundation expansion section 14 is larger than the diameter of the pile foundation 6. A steel sleeve 4 is provided on the outer surface of the pile foundation expansion section 14. A socket section 3 is provided on the pile foundation expansion section 14. After pouring concrete to form the pile foundation expansion section 14, the pier 1 is hoisted into the steel sleeve 4, and then high-toughness concrete is poured into the steel sleeve 4 to form the socket section 3 connected to the pile foundation expansion section 14, so that the pier 1 is connected to the pile foundation 6.

[0042] The pier 1 extends to the outer wall of the socket section 3, and tooth keys 15 surrounding the pier 1 are arranged side by side along the axis of the pier 1. After the pier 1 is inserted into the groove, high-toughness concrete is poured to provide connection strength between the socket section 3 and the pier 1.

[0043] The pile foundation 6 is provided with a pile foundation steel cage 16 and pile foundation main reinforcement 7 tied and fixed to the pile foundation steel cage 16. The pile foundation main reinforcement 7 is circumferentially arranged with the axis of the pile foundation 6 as the center. The pile foundation enlarged section 14 is provided with multiple enlarged section reinforcements 5 circumferentially arranged with the axis of the pile foundation enlarged section 14 as the center. The pile foundation main reinforcement 7 is arranged in the inner circle of the enlarged section reinforcement 5, and the pier 1 is arranged in the inner circle of the pile foundation main reinforcement 7.

[0044] The pile foundation expansion section 14 is connected to the ground tie beam 8, and the ground tie beam 8 is provided with the ground tie beam main reinforcement 9. The ground tie beam main reinforcement 9 is inserted into the pile foundation expansion section 14 and is located below the socket section 3. The steel sleeve 4 is provided with a reserved hole for the ground tie beam main reinforcement 9 to pass through. After the ground tie beam main reinforcement 9 is inserted into the reserved hole of the steel sleeve 4, concrete is poured into the steel sleeve 4 to cover the ground tie beam main reinforcement 9 to form the pile foundation expansion section 14, the pier 1 is hoisted onto the pile foundation expansion section 14, and then high-toughness concrete is poured to form the socket section 3 so that the pier 1 and the pile foundation 6 are connected as a whole.

[0045] The construction method of the first embodiment includes the following steps:

[0046] S1: Prefabricated pier 1 by pouring high-toughness concrete;

[0047] S2: excavating a pile hole at the construction site, placing the steel sleeve 4, the pile foundation steel cage 17, the pile foundation expansion section steel cage 18 and the steel sleeve 4 into the pile hole;

[0048] S3: insert the main reinforcement 9 of the ground tie beam from the reserved hole of the steel sleeve 4 to the pile foundation expansion section 14, cast the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8, and realize the connection of the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8;

[0049] S4: After the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8 reach the preset strength, the pier column 1 is hoisted to the inner side of the pile foundation main reinforcement 7;

[0050] S5: pouring high-toughness concrete in the steel sleeve 4 to form the socket section 3 integrated with the pile foundation expansion section 14 , so that the pier 1 is connected to the pile foundation expansion section 14 .

[0051] Embodiment 2, as Figures 9-10 As shown, based on the first embodiment, an energy-absorbing plate 20 arranged in a U shape is connected between the pier column 1 and the socket section 3, and a plurality of energy-absorbing plates 20 are arranged circumferentially with the axis of the pier column 1 as the center. The first arm of the energy-absorbing plate 20 extends vertically into the pier column 1, and the second arm of the energy-absorbing plate 20 extends vertically into the socket section 3. The arc section of the energy-absorbing plate 20 is arranged in the pile foundation expansion section 14. A socket 101 for inserting the energy-absorbing plate 20 is reserved in the pier column 1. A plurality of energy-absorbing components arranged vertically side by side are fixedly connected between the two arms of the energy-absorbing plate 20. The energy-absorbing components The component includes a sleeve 21, which is hollow inside. Two slide plates 22 are connected by limited sliding friction inside the sleeve 21. A spring 23 in a compressed state is fixedly connected between the two slide plates 22. A connecting rod 24 is fixedly connected to the slide plate 22. The two connecting rods 24 extend out of the sleeve 21 in opposite directions and are fixedly connected to threaded rods 25. The end of the threaded rod 25 close to the sleeve 21 is abutted against the end of the sleeve 21. A threaded hole 26 cooperating with the threaded rod 25 is provided on the energy dissipation plate 20, and the threaded rod 25 is threadedly connected to the threaded hole 26.

[0052] In this solution, the energy dissipation component achieves the energy dissipation effect through two slide plates 22 and a spring 23. The sleeve 21 is used to provide a sliding space to avoid concrete pouring so that the spring 23 and the slide plate 22 are fixed in the socket section 3. The energy dissipation plate 20 and the sleeve 21 strengthen the connection strength of the pier 1, the pile foundation expansion section 14 and the socket section 3.

[0053] Further, the pier 1 is radially provided with radial holes 102 in one-to-one communication with the insertion holes 101, the radial holes 102 are coaxially arranged with the threaded holes 26, the sleeve 21 is plugged and matched with the radial holes 102, and the energy dissipation plate 20 is provided with grooves 27 coaxially arranged with the threaded holes 26, wherein the diameter of the grooves 27 on the first arm of the energy dissipation plate 20 is larger than the diameter of the threaded holes 26, and the diameter of the grooves 27 on the second arm of the energy dissipation plate 20 is smaller than the diameter of the threaded holes 26. This facilitates the installation of the energy dissipation assembly on the energy dissipation plate 20.

[0054] The construction method of the second embodiment includes the following steps:

[0055] A1: Prefabricate the pier 1 by pouring high-toughness concrete, wherein the pier 1 is provided with a plug hole 101 and a radial hole 102.

[0056] A2: excavate a pile hole at the construction site, put the steel sleeve 4, the pile foundation steel cage 17, the pile foundation expansion section steel cage 18 and the steel sleeve 4 into the pile hole, and fix the energy dissipation plate 20 in the steel sleeve 4;

[0057] A3: Insert the main reinforcement 9 of the ground tie beam from the reserved hole of the steel sleeve 4 to the pile foundation expansion section 14, cast the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8, and realize the connection of the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8, wherein the concrete is cast to cover the arc section of the energy dissipation plate 20;

[0058] A4: After the pile foundation expansion section 14, the pile foundation 6 and the ground tie beam 8 reach the preset strength, the pier column 1 is hoisted to the inner side of the pile foundation main reinforcement 7, and the first arms of the plurality of energy dissipation plates 20 are respectively inserted into the corresponding insertion holes 101;

[0059] A5: Fix the energy dissipation assembly between the two arms of the energy dissipation plate 20, wherein the threaded rods 25 at both ends of the sleeve 21 are threadedly connected with the threaded holes 26 of the two arms of the energy dissipation plate 20 respectively, and the two ends of the sleeve 21 abut against the grooves 27;

[0060] A6: Pour high-toughness concrete in the steel sleeve 4 to form a socket section 3 integrated with the pile foundation expansion section 14, so that the pier 1 is connected to the pile foundation expansion section 14; wherein the high-toughness concrete 13 wraps the energy dissipation plate 20 and the energy dissipation components.

[0061] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A prefabricated pier column connection node for a circular single pile, comprising a pier column arranged in a cylindrical shape and a pile foundation fixedly connected to the pier column, characterized in that: The pier is cast by high-toughness concrete, and a plurality of prestressed steel strands extending along the axis of the pier are arranged in the pier, and the prestressed steel strands are pre-tensioned bonded steel strands. The bottom of the pier is arranged as a plastic hinge area, and the pier is provided with energy-absorbing steel bars in the plastic hinge area. A pile foundation expansion section coaxially arranged with the pile foundation is provided on the pile foundation, and the diameter of the pile foundation expansion section is larger than the diameter of the pile foundation. A steel sleeve is provided on the outer surface of the pile foundation expansion section, and a socket section is provided on the pile foundation expansion section. After pouring concrete to form the pile foundation expansion section, the pier is hoisted into the steel sleeve, and high-toughness concrete is poured into the steel sleeve to form a socket section connected to the pile foundation expansion section, so that the pier is connected to the pile foundation.

2. The prefabricated pier column connection node for a circular monopile according to claim 1, characterized in that: The pier is provided with spiral stirrups spirally arranged along the axis of the pier, and a plurality of stand bars axially arranged in the direction of the axis of the pier. The stand bars are tied and fixed to the spiral stirrups, the energy-absorbing steel bars are tied and fixed to the spiral stirrups, and the prestressed steel strands are arranged on the inner sides of the plurality of stand bars.

3. The prefabricated pier column connection node for circular monopile according to claim 2, characterized in that: The outer wall of the pier column extending to the socket section is provided with tooth keys surrounding the pier column in parallel along the axis of the pier column.

4. The prefabricated pier column connection node for a circular monopile according to claim 3, characterized in that: The pile foundation is provided with a pile foundation steel cage and pile foundation main bars fixed to the pile foundation steel cage. The pile foundation main bars are arranged circumferentially with the pile foundation axis as the center. The pile foundation expansion section is provided with multiple expansion section steel bars circumferentially with the pile foundation expansion section axis as the center. The pile foundation main bars are arranged in the inner circle of the expansion section steel bars, and the pier is arranged in the inner circle of the pile foundation main bars.

5. The prefabricated pier column connection node for circular monopile according to claim 4, characterized in that: The pile foundation expansion section is connected with a ground tie beam, and the ground tie beam is provided with main reinforcement of the ground tie beam. The main reinforcement of the ground tie beam is inserted into the pile foundation expansion section and is located below the socket section. The steel sleeve is provided with reserved holes for the main reinforcement of the ground tie beam to pass through. After the main reinforcement of the ground tie beam is inserted into the reserved holes of the steel sleeve, concrete is poured into the steel sleeve to cover the main reinforcement of the ground tie beam to form the pile foundation expansion section, the pier is hoisted onto the pile foundation expansion section, and then high-toughness concrete is poured to form the socket section so that the pier and the pile foundation are connected as one.

6. The prefabricated pier column connection node for circular monopile according to claim 5, characterized in that: An energy absorbing plate arranged in a U shape is connected between the pier and the socket section, and multiple energy absorbing plates are circumferentially arranged with the pier axis as the center, the first arm of the energy absorbing plate extends vertically into the pier, the second arm of the energy absorbing plate extends vertically into the socket section, the arc section of the energy absorbing plate is arranged in the pile foundation expansion section, and a socket for inserting the energy absorbing plate is reserved in the pier, and multiple energy absorbing components arranged vertically side by side are fixedly connected between the two arms of the energy absorbing plate, and the energy absorbing component includes a sleeve in the middle of the interior, and two slide plates are connected in a limited sliding friction manner in the sleeve, and a spring in a compressed state is fixedly connected between the two slide plates, and a connecting rod is fixedly connected to the slide plate, and the two connecting rods are respectively extended out of the sleeve in reverse directions and fixedly connected with threaded rods, and the ends of the threaded rods close to the sleeve are abutted against the ends of the sleeve, and a threaded hole matching the threaded rod is provided on the energy absorbing plate, and the threaded rod is threadedly connected to the threaded hole.

7. The prefabricated pier column connection node for circular monopile according to claim 6, characterized in that: A radial hole is radially arranged in the pier column and is connected to the insertion hole in a one-to-one manner. The radial hole is coaxially arranged with the threaded hole. The sleeve is plugged into the radial hole. A groove is coaxially arranged with the threaded hole. The energy dissipation plate is provided with a groove, wherein the diameter of the groove of the first arm of the energy dissipation plate is larger than the diameter of the threaded hole, and the diameter of the groove on the second arm of the energy dissipation plate is smaller than the diameter of the threaded hole.

8. The construction method of a prefabricated pier column connection node for a circular monopile according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Precast piers by pouring high-toughness concrete; S2: excavate a pile hole at the construction site, and place the steel sleeve, pile foundation steel cage, pile foundation expansion section steel cage and steel sleeve into the pile hole; S3: Insert the main reinforcement of the ground tie beam from the reserved hole of the steel sleeve to the pile foundation expansion section, cast the pile foundation expansion section, pile foundation and ground tie beam, and realize the connection of the pile foundation expansion section, pile foundation and ground tie beam; S4: After the pile foundation expansion section, pile foundation and ground tie beam reach the preset strength, the pier column is hoisted to the inner side of the main reinforcement of the pile foundation; S5: Pour high-toughness concrete in the steel sleeve to form a socket section that is integrated with the pile foundation expansion section, so that the pier column is connected to the pile foundation expansion section.

9. The construction method of a prefabricated pier column connection node for a circular monopile according to any one of claims 1 to 7, characterized in that: The following steps are involved: A1: Prefabricated piers are cast with high-toughness concrete, where sockets and radial holes are reserved. A2: Dig a pile hole at the construction site, put the steel sleeve, pile foundation steel cage, pile foundation expansion section steel cage and steel sleeve into the pile hole, and fix the energy dissipation plate in the steel sleeve; A3: Insert the main reinforcement of the ground tie beam from the reserved hole of the steel sleeve to the pile foundation expansion section, cast the pile foundation expansion section, pile foundation and ground tie beam, and realize the connection of the pile foundation expansion section, pile foundation and ground tie beam, in which concrete is poured to cover the arc section of the energy dissipation plate; A4: After the pile foundation expansion section, pile foundation and ground tie beam reach the preset strength, the pier column is hoisted to the inner side of the main reinforcement of the pile foundation, and the first arms of the multiple energy dissipation plates are respectively inserted into the corresponding sockets; A5: Fix the energy dissipation assembly between the two arms of the energy dissipation plate, wherein the threaded rods at both ends of the sleeve are respectively threadedly connected with the threaded holes of the two arms of the energy dissipation plate 20, and the two ends of the sleeve are against the groove; A6: Pour high-toughness concrete in the steel sleeve to form a socket section that is integrated with the pile foundation expansion section, so that the pier column is connected to the pile foundation expansion section; wherein, the high-toughness concrete wraps the energy-absorbing plate and the energy-absorbing components.

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