A connection structure between composite steel pipe pile and cap

Abstract

The present invention provides a connection structure between a composite steel pipe pile and a cap, and relates to the technical field of bridge engineering. The connection structure comprises a cap; a composite steel pipe pile fixedly connected to the cap, the composite steel pipe pile comprising a steel pipe and an outer covering part partially covering the outer surface of the steel pipe; wherein the outer covering part is formed of ultra-high performance concrete; and an anchoring steel bar partially arranged in the cap along the length extension direction of the steel pipe and adjacent to the inner wall surface of the steel pipe. The connection structure of the present invention improves the durability of the connection.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more specifically to a connection structure between a composite steel pipe pile and a cap. Background Art

[0002] The structure of the connection between the composite steel pipe pile and the cap involves the effectiveness and durability of the steel-concrete combined force transmission, and this part is the key part of this type of foundation.

[0003] The design of the connection structure between the related steel pipe pile and the cap adopts a method of directly connecting one end of the pipe pile to the cap and setting anchor bars at one end of the pipe pile. The connection structure is simple in layout, the connection strength between the steel pipe and the cap concrete is poor, and the durability of the structure is difficult to guarantee. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to provide a connection structure between a composite steel pipe pile and a cap, so as to solve the technical problem of how to improve the durability of the connection structure between the composite steel pipe pile and the cap.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] The present invention provides a connection structure between a composite steel pipe pile and a cap, comprising: a cap; a composite steel pipe pile fixedly connected to the cap, the composite steel pipe pile comprising a steel pipe and an outer casing partially covering the outer surface of the steel pipe; wherein the outer casing is formed of ultra-high performance concrete; and an anchoring steel bar partially arranged in the cap along the length extension direction of the steel pipe and adjacent to the inner wall surface of the steel pipe.

[0007] Furthermore, the connection structure between the composite steel pipe pile and the pedestal also includes: a first connecting rib, which is located above the outer casing, is arranged in the pedestal along the length extension direction of the steel pipe, and is connected to the steel pipe; a second connecting rib, one end of which is arranged in the outer casing, and the other end of the second connecting rib opposite to the one end is connected to the first connecting rib.

[0008] Furthermore, the steel pipe includes: a pipe body, which encloses a cavity; the outer surface of the pipe body is partially covered by the outer casing; a steel plate, which is arranged at one end of the pipe body, and the steel plate is provided with a first through hole connected to the cavity; wherein the anchor steel bar and the first connecting bar are both connected to the steel plate; an end plate, which is arranged in the cavity and located at the other end of the pipe body, and the end plate is connected to the pipe body.

[0009] Furthermore, along the radial direction of the steel plate, the inner edge and the outer edge of the steel plate are both provided with notched grooves, the end of the anchor steel bar is located in the notched groove of the inner edge, and the one end of the first connecting bar is located in the notched groove of the outer edge.

[0010] Furthermore, the anchoring steel bar includes a first steel bar, which is symmetrically arranged about the axial direction and connected to the inner wall surface of the tube body. The first steel bar partially extends into the base and is located in the notch groove of the inner edge.

[0011] Furthermore, the anchoring steel bar also includes a second steel bar, which is arranged in the cavity along a direction perpendicular to the axial line, and the second steel bar is located above the end plate and connected to the end plate; wherein the second steel bar is connected to the other end opposite to the first steel bar and is integrally formed with the first steel bar.

[0012] Furthermore, the end plate has an air outlet hole connected to the cavity; the connection structure also includes a cover plate, which is arranged on the end plate and is used to close the air outlet hole.

[0013] Furthermore, the cavity is used for placing core-filling concrete.

[0014] Furthermore, the connection structure between the composite steel pipe pile and the cap also includes a first shear nail, which is arranged in the outer casing, and the first shear nail connects the outer casing and the pipe body.

[0015] Furthermore, the connection structure between the composite steel pipe pile and the cap also includes a second shear nail, which is arranged in the cavity and connects the core-filling concrete and the pipe body.

[0016] The present invention provides a connection structure of a composite steel pipe pile and a cap, comprising a cap, a composite steel pipe pile and an anchoring steel bar. The composite steel pipe pile is connected to the cap, a part of the anchoring steel bar is arranged in the cap, and the other part is connected to the composite steel pipe pile, and the durability of the connection structure is further improved through the connection between the components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the connection structure between a composite steel pipe pile and a cap according to an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of the end plate and anchor steel bars of another connection structure between a composite steel pipe pile and a cap;

[0019] Figure 3 A schematic diagram of a steel plate structure of a connection structure between a composite steel pipe pile and a cap according to an embodiment of the present invention;

[0020] Figure 4A schematic structural diagram of an end plate and anchor steel bars of a connection structure between a composite steel pipe pile and a cap according to an embodiment of the present invention;

[0021] Figure 5 A structural schematic diagram of a steel plate notch groove of a connection structure between a composite steel pipe pile and a cap according to an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the steel plate structure of another connection structure between a composite steel pipe pile and a cap.

[0023] Description of reference numerals:

[0024] 10-composite steel pipe pile, 11-steel pipe, 111-tube body, 1111-cavity, 112-steel plate, 1121-first through hole, 1122-notch groove, 1123-second through hole, 113-end plate, 1131-weld, 1132-flexible plugging, 1133-air vent, 114-cover plate, 12-outer package, 13-stirrup, 141-first shear nail, 142-second shear nail, 20-anchor steel bar, 21-first steel bar, 22-second steel bar, 31-first connecting bar, 32-second connecting bar, C-cap, O'-center axis, L1-distance between the upper end face of the outer package and the upper end face of the tube body DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of the specific technical features in the present invention will not be described separately.

[0027] In the following description, the terms "first\second" are only used to distinguish different objects, and do not mean that there is any similarity or connection between the two. It should be understood that the orientation descriptions "above" and "below" are both orientations in normal use.

[0028] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. The term "connected" includes both direct and indirect connections unless otherwise specified. "Adjacent" means that the corresponding two parts are in contact or, although not in contact, the width of the gap between the two parts is much smaller than the width of either of the two parts.

[0029] The present invention provides a connection structure that can be widely used in the field of bridge engineering. It can be used as a connection component to connect the pipe piles and the cap of the bridge. It can also be used as a foundation in the construction of marine engineering projects such as docks or ports. It should be noted that the application scenario type of the present invention does not limit the connection structure of the present invention.

[0030] like Figure 1 As shown, the connection structure between the composite steel pipe pile and the cap in the embodiment of the present invention may include a cap C, a composite steel pipe pile 10 and an anchoring steel bar 20. It should be noted that the cap C is the connecting part between the pile body and the column body or the pier body. The cap C can bear and distribute the load transmitted by the pier body. The cap C is a reinforced concrete platform arranged at the top of the pile foundation to connect the tops of the piles. For example, in an embodiment of the present invention, the cap C is located under the pier of the bridge, connecting the composite steel pipe pile 10 and the bridge pier. The composite steel pipe pile 10 is fixedly connected to the cap C. Specifically, the composite steel pipe pile 10 can be a long column, and the upper end of the composite steel pipe pile 10 is integrated with the cast-in-place cap C, so that the composite steel pipe pile 10 is connected to the cap C.

[0031] like Figure 1As shown, the composite steel pipe pile 10 includes a steel pipe 11 and an outer package 12 partially covering the outer surface of the steel pipe 11. Specifically, in order to strengthen the connection between the steel pipe 11 and the outer package 12 and the cap C, during the construction of the cast-in-place cap C, concrete is poured on the upper end of the steel pipe 11 and the upper end of the outer package 12 to form the cap C, that is, the upper end of the steel pipe 11 and the upper end of the outer package 12 are both embedded in the cast-in-place cap C. Therefore, the upper end surface of the steel pipe 11 and the upper end surface of the outer package 12 are both higher than the lower end surface of the cap C by a certain distance. The number of steel pipes 11 is arbitrary, it can be one or more, and multiple pipes can be arranged in a head-to-tail splicing manner. The cross-sectional shape of the steel pipe 11 is arbitrary, it can be circular, it can be rectangular, or it can be polygonal. It should be noted that the cross section refers to a surface perpendicular to the length extension direction of the steel pipe 11. In an exemplary embodiment, a steel pipe 11 with a circular cross section is used for subsequent description. The steel pipe 11 can be a solid cylinder or a hollow cylinder with a certain wall thickness. Considering the economic efficiency, a hollow cylinder with a certain wall thickness is used in this embodiment for subsequent explanation. In practical applications, the steel pipe 11 is easily damaged in a corrosive harsh environment such as seawater due to the long-term and continuous erosion of seawater, which affects the durability of its support. The outer package 12, as a material with good corrosion resistance, is coated on the outer surface of the steel pipe 11 to protect the steel pipe 11 from erosion by the external environment. In addition, the pipe pile requires sufficient structural strength to withstand the gravity of the pedestal C and the beam body. The outer package 12 has a certain thickness and is coated on the outer surface of the steel pipe 11. It can participate in the structural force and share the gravity of the structure above the pipe pile with the steel pipe 11. The upper end of the steel pipe 11 is higher than the upper end of the outer package 12 by a distance L1. In an exemplary embodiment, the distance L1 is 10 to 15 cm. In this way, during the construction of the sinking steel pipe 11, the portion of the outer casing 12 near the upper end will not be damaged due to the construction operation of the sinking steel pipe 11. That is, the outer surface of the steel pipe 11 is partially covered with the outer casing 12.

[0032] The outer casing 12 is formed of ultra-high performance concrete. Specifically, ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), is a cement-based composite material with ultra-high strength, high toughness, high durability and good volume stability. It has extremely low permeability, high resistance to environmental medium erosion and good wear resistance. This material can adapt to the harsh marine environment, effectively prevent seawater and corrosive air from corroding the steel pipe, and significantly improve the corrosion resistance of the composite steel pipe pile.

[0033] like Figure 1As shown, the anchoring steel bar 20 is partially arranged in the cap C along the length extension direction of the steel pipe 11, and is adjacent to the inner wall surface of the steel pipe 11. Specifically, the central axis of the steel pipe 11 is O', and the anchoring steel bar 20 is symmetrically arranged about the central axis O', and the upper end of the anchoring steel bar 20 extends into the cap C and is fixedly connected to the cap C. The anchoring steel bar 20 is arranged adjacent to the inner wall surface of the steel pipe 11. It should be noted that adjacent means that the corresponding two parts are in contact or not in contact, but the width of the gap between the two parts is much smaller than the width of any of the two parts. Specifically, the anchoring steel bar 20 and the inner wall surface of the steel pipe 11 can be connected, or a certain gap can be maintained. The anchoring steel bar 20 can be fixedly connected to the steel pipe 11 by welding, and the anchoring steel bar 20 can also be directly attached to the inner wall surface of the steel pipe 11. The space inside the steel pipe 11 can be poured with concrete. There can be multiple anchoring steel bars 20, which are arranged at intervals along the circumferential direction of the steel pipe 11.

[0034] The structure of the anchoring steel bar 20 in the embodiment of the present invention may also have other specific implementations. For example, Figure 2 The anchoring steel bars 20 shown are arranged symmetrically about the central axis O′, and the upper ends of the anchoring steel bars 20 are arranged in the base C and adjacent to the inner wall surface of the steel pipe 11.

[0035] The connection structure between the composite steel pipe pile and the cap in the embodiment of the present invention is achieved by partially covering the outer surface of the steel pipe with an outer covering, and burying one end of the steel pipe and the outer covering in the cap, so that the steel pipe and the outer covering are fixedly connected to the cap, and the anchor steel bar is arranged adjacent to the steel pipe and partially buried in the cap, so that the anchor steel bar and the cap are fixedly connected. The multiple components of the connection structure are arranged in multiple levels, so that the components are connected and linked to each other, thereby forming a firm and tight connection. The connection structure between the composite steel pipe pile and the cap in the embodiment of the present invention greatly improves the durability of the connection.

[0036] In some embodiments, Figure 1 As shown, the connection structure between the composite steel pipe pile and the cap also includes a first connection rib 31 and a second connection rib 32. Specifically, the first connection rib 31 and the second connection rib 32 are both long strip steel bars, and the extension direction of the length is the direction of the central axis O'. The number of the first connection rib 31 and the second connection rib 32 is arbitrary, and there can be multiple, which are arranged at intervals along the circumference of the steel pipe 11.

[0037] The first connecting rib 31 is located above the outer casing 12, is arranged in the cap C along the length extension direction of the steel pipe 11, and is connected to the steel pipe 11. Specifically, the first connecting rib 31 is arranged in the cap C and is connected to the upper end of the steel pipe 11. The first connecting rib 31 can not only strengthen the structural strength of the cap C, but also further strengthen the connection between the upper end of the steel pipe 11 and the cap C. One end of the second connecting rib 32 is arranged in the outer casing 12, and the other end of the second connecting rib 32 opposite to the one end is connected to the first connecting rib 31. Specifically, a part of the second connecting rib 32 is arranged in the outer casing 12, and the other part protrudes from the upper end of the outer casing 12 and extends into the cap C, and is fixedly connected to the end of the first connecting rib 31. On the one hand, the second connecting rib 32 can improve the overall structural strength and extensibility of the outer casing 12 along the center axis O' direction. On the other hand, the second connecting rib 32 further strengthens the connection between the upper end of the outer casing 12 and the base C, and also strengthens the connection between the upper end of the outer casing 12 and the upper end of the steel pipe 11.

[0038] The connection between the steel pipe and the cap is further strengthened by setting the first connecting rib, and the connection between the outer package, the cap and the steel pipe is further strengthened by setting the second connecting rib. This setting method is flexible and ingenious, so that the components are connected to each other and it is also easy to construct.

[0039] Optionally, stirrups 13 may be provided in the outer casing 12. The stirrups 13 may be circular steel bars, which are provided around the steel pipe 11. There may be multiple stirrups 13, which are provided at intervals along the center axis O' direction. The stirrups 13 may improve the structural strength of the outer casing 12 in the horizontal direction.

[0040] In some embodiments, Figure 1 and Figure 2 As shown, the steel pipe 11 includes a pipe body 111, a steel plate 112 and an end plate 113. The pipe body 111 encloses a cavity 1111, and the outer surface of the pipe body 111 is partially covered by the outer casing 12. Specifically, the pipe body 111 is an elongated column, and its cross-sectional shape is arbitrary, which can be circular, rectangular and polygonal. In the exemplary embodiment, the pipe body 111 adopts a cylinder with a circular cross-sectional shape for subsequent description. The pipe body 111 has a cavity 1111 that runs through one end to the other opposite end. As shown in FIG. Figure 1 As shown, an outer cover 12 is laid on the outer surface of the pipe body 111 to protect the outer surface of the pipe body 111 from corrosion by the external environment. The length of the outer cover 12 is less than the length of the pipe body 1111, and the upper end surface of the outer cover 12 is L1 away from the upper end surface of the pipe body 1111. In this way, the portion of the outer cover 12 close to the upper end will not be damaged due to the construction operation of sinking the steel pipe 11. In addition, the portion of the pipe body 1111 close to the upper end is located in the foundation C, and the outer cover 12 is not laid on this portion.

[0041] like Figure 2As shown, the steel plate 112 is disposed at one end of the tube body 111, and the steel plate 112 is provided with a first through hole 1121 communicating with the cavity 1111. Specifically, the steel plate 112 is disposed in the support platform C, located on the upper end surface of the tube body 111, and fixedly connected to the tube body 111. Figure 3 As shown, the steel plate 112 may be a ring-shaped steel plate, and the through hole in the middle of the ring is the first through hole 1121. Figure 2 As shown, the first through hole 1121 is connected to the cavity 1111, and the first through hole 1121 can be used as an inlet for pouring concrete into the steel pipe 11. Figure 1 As shown, the anchoring steel bar 20 and the first connecting bar 31 are both connected to the steel plate 112. Specifically, the anchoring steel bar 20 and the first connecting bar 31 are both penetrated in the steel plate 112, and the anchoring steel bar 20 and the first connecting bar 31 can be welded to the steel plate 112, or can be fixedly connected to the steel plate 112 by concrete pouring.

[0042] like Figure 1 As shown, the end plate 113 is arranged in the cavity 1111 and is located at the other end of the tube body 111, and the end plate 113 is connected to the tube body 111. Specifically, the end plate 113 is horizontally arranged near the lower end of the cavity 1111. The shape of the end plate 113 is determined according to the shape of the tube body 111. The end plate 113 in the embodiment of the present invention is a circular end plate, and the diameter of the end plate 113 is substantially the same as the diameter of the tube body 111. The end plate 113 can be fixedly connected to the inner wall surface of the tube body 111 by welding or bonding. Figure 2 As shown, a weld 1131 can be provided on the outer edge of the end plate 113 to weld it to the tube body 111. Figure 4 As shown, the end plate 113 can be connected to the tube body 111 by setting a flexible plug 1132 on the outer edge of the upper end surface of the end plate 113, and at the same time, the space enclosed by the bottom can be ensured to have good sealing performance, and concrete can be poured in the space. In addition, the supporting effect of the end plate 113 can also improve the structural strength of the lower end of the tube body 111.

[0043] By arranging the steel pipe into a pipe body, a steel plate and an end plate, and the various components are interconnected and connected with anchor steel bars and connecting bars, the reliability and durability of the connection structure are further improved.

[0044] In some implementations, such as Figure 5As shown, along the radial direction of the steel plate 112, the inner edge and the outer edge of the steel plate 112 are provided with a notch groove 1122, the end of the anchoring steel bar 20 is located in the notch groove 1122 of the inner edge, and one end of the first connecting bar 31 is located in the notch groove 1122 of the outer edge. Specifically, along the circumferential direction of the steel plate 112, a plurality of notch grooves 1122 are provided on the inner edge and the outer edge of the steel plate 112, and the shape of the notch groove 1122 is arbitrary. In an exemplary embodiment, the notch groove 1122 can be a U-shaped groove, that is, the arc edge of the notch connects two straight edges. The width of the notch groove 1122 of the inner edge is greater than the diameter of the anchoring steel bar 20, so that the anchoring steel bar 20 can be inserted into the notch groove 1122. It should be noted that the width refers to the distance between the two opposite straight edges of the notch groove. The anchoring steel bar 20 is connected to the steel plate 112 through the notch groove 1122 of the inner edge. The width of the notch groove 1122 at the outer edge is greater than the width of the first connecting rib 31, so that the first connecting rib 31 can be inserted into the notch groove 1122, and the first connecting rib 31 is connected to the steel plate 112 through the notch groove 1122 at the outer edge. By providing a notch groove at the edge of the steel plate and arranging the anchoring steel bar and the first connecting rib in the notch groove, the connection between each steel bar and the steel plate is achieved. This arrangement is simple in structure and easy to construct.

[0045] Optional, such as Figure 6 As shown, a second through hole 1123 may be opened in the steel plate 112 , and the anchoring steel bar 20 and the first connecting bar 31 pass through the second through hole 1123 to form a connection with the steel plate 112 .

[0046] In some implementations, such as Figure 2 As shown, the anchoring steel bar 20 includes a first steel bar 21, which is symmetrically arranged about the axis direction and connected to the inner wall surface of the tube body 111. Specifically, the first steel bar 21 can be a long strip steel bar, and the extension direction of its length is the same as the direction of the central axis O'. The first steel bar 21 is arranged adjacent to the inner wall surface of the tube body 111, and the lower end of the first steel bar 21 can be fixedly connected to the inner wall surface of the tube body 111 by welding or bonding. In an exemplary embodiment, the first steel bar 21 and the tube body 111 can be welded together by setting a weld 1131 between the first steel bar 21 and the inner wall surface of the tube body 111. The first steel bar 21 partially extends into the cap C and is located in the notch groove 1122 of the inner edge. Specifically, the upper end of the first steel bar 21 is buried in the cap C, and extends into the notch groove 1122 to connect with the steel plate 112. By setting the anchor steel bar as a long strip-shaped first connecting bar, burying the first connecting bar in the base, and connecting it with the steel pipe, the connection between the various components is further strengthened, and the durability and reliability of the connection structure are improved; and the structure is simple and the setting is more flexible.

[0047] In other implementations, such as Figure 4As shown, the anchoring steel bar 20 also includes a second steel bar 22, which is arranged in the cavity 1111 along a direction perpendicular to the axis. The second steel bar 22 is located above the end plate 113 and connected to the end plate 113; wherein the second steel bar 22 is connected to the other end opposite to the first steel bar 21 and is integrally formed with the first steel bar 21. Specifically, the second steel bar 22 can be an arc-shaped steel bar, which is symmetrically arranged about the central axis O'. The second steel bar 22 is located below the first steel bar 21 and is integrally formed with the first steel bar 21, and the second steel bar 22 forms an arc transition with the first steel bar 21. The second steel bar 22 can be fixedly connected to the end plate 113 through a weld 1131, effectively reducing the risk of displacement of the second steel bar 22. The first steel bar and the second steel bar are integrally formed to form a U-shaped steel bar, and the U-shaped steel bar can improve the structural strength of the concrete in the cavity, thereby further improving the durability and reliability of the connection structure.

[0048] In some implementations, such as Figure 2 As shown, the end plate 113 has an air outlet 1133 connected to the cavity 1111. Specifically, the air outlet 1133 is opened in the approximate middle area of ​​the end plate 113 for discharging the gas in the tube body 111, and the diameter of the air outlet 1133 is much smaller than the diameter of the end plate 113. The connection structure also includes a cover plate 114, which is arranged on the end plate 113 and is used to close the air outlet 1133. Specifically, the cover plate 114 is located in the approximate middle area of ​​the upper surface of the end plate 113, and the shape of the cover plate 114 is arbitrary. In an exemplary embodiment, the cover plate 114 can be a circular cover plate, and the diameter is larger than the diameter of the air outlet 1133, so that the cover plate 114 can close the air outlet 1133 and ensure the sealing of the lower end of the tube body 111.

[0049] In some implementations, such as Figure 2 As shown, the cavity 1111 is used to place the core-filled concrete. Specifically, the cavity 1111 of the tube body 111 is used to fill the core-filled concrete and is integrated with the anchoring steel bar 20. The core-filled concrete is easy to construct, has a long service life, and has a low construction cost.

[0050] In some implementations, such as Figure 1As shown, the connection structure between the composite steel pipe pile and the cap also includes a first shear nail 141, which is arranged in the outer casing 12, and the first shear nail 141 connects the outer casing 12 and the pipe body 111. Specifically, there may be a plurality of first shear nails 141, which are arranged at intervals along the direction of the central axis O' and are arranged at intervals around the circumference of the pipe body 111. The first shear nail 141 is adjacent to the second connecting rib 32, and one end of the first shear nail 141 is fixedly connected to the pipe body 111, so that the outer casing 12 can be firmly attached to the outer surface of the pipe body 111, thereby improving the tightness of the connection between the two and reducing the risk of gradual delamination between the outer casing 12 and the pipe body 111 as the service life increases. The connection relationship between the outer casing and the main body is strengthened by arranging the first shear nail in the outer casing, and the arrangement method has a simple structure.

[0051] In some implementations, such as Figure 1 As shown, the connection structure between the composite steel pipe pile and the cap also includes a second shear nail 142, which is arranged in the cavity 1111 to connect the core-filled concrete and the pipe body 111. Specifically, there can be a plurality of second shear nails 142, which are arranged at intervals along the direction of the central axis O' and are arranged at intervals around the circumferential surface of the inner surface of the pipe body 111. The second shear nail 142 is adjacent to the anchoring steel bar 20, and one end of the second shear nail 142 is fixedly connected to the inner wall surface of the pipe body 111, so that the connection between the core-filled concrete and the inner wall surface of the pipe body 111 can be strengthened. The connection relationship between the core-filled concrete and the main body is strengthened by arranging the second shear nail in the cavity, and the arrangement method has a simple structure.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A connection structure between a composite steel pipe pile and a cap, characterized in that: include: platform; A composite steel pipe pile is fixedly connected to the cap, the composite steel pipe pile comprises a steel pipe and an outer covering part partially covering the outer surface of the steel pipe; wherein the outer covering part is formed of ultra-high performance concrete, the steel pipe comprises a pipe body, a steel plate and an end plate, the pipe body is surrounded to form a cavity, the cavity is used to place core-filling concrete, the steel plate is arranged at one end of the pipe body, the end plate is arranged in the cavity and located at the other end of the pipe body, and the end plate is connected to the pipe body; Anchoring steel bars are partially arranged in the cap along the length extension direction of the steel pipe and are adjacent to the inner wall surface of the steel pipe, the anchoring steel bars include a first steel bar and a second steel bar connected to the first steel bar, the first steel bar is symmetrically arranged about the central axis direction of the steel pipe and connected to the inner wall surface of the pipe body, the first steel bar partially extends into the cap, the first steel bar is connected to the steel plate, and the second steel bar is arranged in the cavity along a direction perpendicular to the central axis direction of the steel pipe and connected to the end plate; A first connecting rib, located above the outer package, disposed in the cap along the length extension direction of the steel pipe, and connected to the steel pipe; A second connecting rib, one end of which is disposed in the outer package, and the other end of which, opposite to the one end, is connected to the first connecting rib; A first shear nail is disposed in the outer casing, and the first shear nail connects the outer casing and the tube body; The second shear nail is arranged in the cavity and connects the core-filling concrete and the pipe body.

2. The connection structure between the composite steel pipe pile and the cap according to claim 1, characterized in that: The steel plate is provided with a first through hole communicating with the cavity.

3. The connection structure between the composite steel pipe pile and the cap according to claim 2, characterized in that: Along the radial direction of the steel plate, the inner edge and the outer edge of the steel plate are both provided with notched grooves, the end of the anchor steel bar is located in the notched groove of the inner edge, and one end of the first connecting bar is located in the notched groove of the outer edge.

4. The connection structure between the composite steel pipe pile and the cap according to claim 3, characterized in that: The first steel bar portion extends into the cap and is located in the notch groove of the inner edge.

5. The connection structure between the composite steel pipe pile and the cap according to claim 4, characterized in that: The second steel bar is located above the end plate; the second steel bar is integrally formed with the first steel bar.

6. The connection structure between the composite steel pipe pile and the cap according to claim 2, characterized in that: The end plate has an air outlet hole connected to the cavity; the connection structure also includes a cover plate, which is arranged on the end plate and is used to close the air outlet hole.

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