Connecting structure of steel pipe pile and prefabricated bearing platform, construction method of connecting structure and supporting structure

Abstract

The invention discloses a connecting structure of a steel pipe pile and a prefabricated bearing platform, a construction method of the connecting structure and a supporting structure. The connecting structure comprises a connecting piece, the prefabricated bearing platform and the steel pipe pile. A connecting plate is arranged at the top of the prefabricated bearing platform, a pre-embedded steel pipe is arranged in the prefabricated bearing platform, the top of the pre-embedded steel pipe is closed through the connecting plate, the upper end of the steel pipe pile is inserted into the pre-embedded steel pipe, and an end plate is arranged at the upper end of the steel pipe pile. Grouting materials are filled between the steel pipe pile and the connecting plate and between the steel pipe pile and the inner wall of the embedded steel pipe, the connecting piece penetrates through the connecting plate and the end plate to connect the connecting plate with the end plate, and the connecting structure, the construction method of the connecting structure and the supporting structure can guarantee the construction precision.

Description

Technical Field

[0001] The invention belongs to the technical field of overhead power transmission line engineering, and relates to a connection structure of a steel pipe pile and a prefabricated cap, a construction method thereof and a supporting structure. Background Art

[0002] Mechanized construction is an inevitable trend in the development of power transmission and transformation engineering construction. The power transmission lines are distributed in point and line form, and it is difficult and expensive for mechanical equipment to enter and exit the site. This requires that construction machinery and equipment must be lightweight, and the miniaturization and miniaturization of foundation size are the prerequisites for lightweight construction machinery and equipment. At present, it is required to grasp the source of design, promote the application of micro pile foundation according to local conditions, and promote the comprehensive promotion of mechanized construction in power transmission and transformation engineering construction.

[0003] Micro pile foundation is a foundation composed of small diameter piles and a cap connected to the top of the pile. The pile body diameter is generally 150mm~400mm according to the pile forming method. The pile body can be a cast-in-place pile, a steel pipe pile, or a PHC pipe pile. The cap is generally cast on site. The current practical constraint is that the construction period of concrete pouring and wet maintenance is long, and construction cannot be carried out when the temperature is low in winter, which cannot meet the engineering requirements of rapid construction.

[0004] In the clay foundation of plains and hilly areas where overhead transmission lines of voltage levels of 500kV and below pass, the use of soil-squeezing micro steel pipe piles and reinforced concrete prefabricated caps can well meet the construction needs of on-site mechanized construction and less wet concrete pouring operations. Micro steel pipe piles and reinforced concrete prefabricated caps are generally connected mechanically, which requires high construction accuracy of micro steel pipe piles. However, the soil-squeezing micro steel pipe piles of transmission lines are generally constructed with hydraulic vibrating hammers or diesel hammers. Due to the unevenness of underground rock and soil and the uneven technical level of the construction team, it is inevitable that there will be construction accuracy errors such as pile position deviation, inclination, and uncontrolled pile top elevation. How to ensure the installation accuracy of micro piles and reinforced concrete prefabricated caps and take into account construction errors is a dilemma, so the design of the connection method between micro steel pipe piles and reinforced concrete prefabricated caps is particularly important. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a connection structure of a steel pipe pile and a prefabricated cap, a construction method thereof and a supporting structure, wherein the connection structure, the construction method thereof and the supporting structure can ensure construction accuracy.

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

[0007] In one aspect of the present invention, the connection structure between the steel pipe pile and the prefabricated cap comprises a connection piece, a prefabricated cap and a steel pipe pile;

[0008] A connecting plate is provided on the top of the prefabricated foundation, and an embedded steel pipe is provided in the prefabricated foundation. The top of the embedded steel pipe is closed by the connecting plate, and the upper end of the steel pipe pile is inserted into the embedded steel pipe. An end plate is provided on the upper end of the steel pipe pile. Grouting material is filled between the steel pipe pile and the connecting plate and the inner wall of the embedded steel pipe. The connecting piece passes through the connecting plate and the end plate to connect the connecting plate and the end plate.

[0009] The connection structure between the steel pipe pile and the prefabricated cap described in the present invention is further improved in that:

[0010] Furthermore, a cushion layer is provided at the bottom of the prefabricated foundation, and the steel pipe piles pass through the cushion layer and are inserted into the embedded steel pipes.

[0011] Furthermore, it also includes a plurality of embedded parts, the lower end of each embedded part is embedded in the prefabricated foundation, the upper end of each embedded part passes through the connecting plate, and the embedded part is connected to the connecting plate.

[0012] Furthermore, the embedded parts are evenly distributed in the circumferential direction.

[0013] Furthermore, the embedded parts are located around the connecting part.

[0014] Furthermore, the connecting plate is provided with a central opening for the connecting piece to pass through and peripheral openings for the embedded piece to pass through, and the diameter of the central opening is larger than the diameter of the connecting piece.

[0015] Furthermore, the axis of the steel pipe pile may not coincide with the axis of the embedded steel pipe.

[0016] Furthermore, the grouting material is a cement-based micro-expansion grouting material.

[0017] In a second aspect of the present invention, a construction method for a connection structure between a steel pipe pile and a prefabricated cap according to the present invention comprises the following steps:

[0018] Making the prefabricated foundation;

[0019] Installing the steel pipe piles in place;

[0020] Sleeving the prefabricated cap onto the steel pipe pile, and connecting the connecting piece to the end plate at the upper end of the steel pipe pile;

[0021] The grouting material is poured, the connecting plate is installed, and the connecting plate is connected to the connecting piece.

[0022] In the third aspect of the present invention, the supporting structure of the present invention includes columns and a connection structure between steel pipe piles and prefabricated caps, wherein the connection structure between the steel pipe piles and the prefabricated caps is located below the ground, and the lower end of the column is located on the prefabricated cap in the connection structure between the steel pipe piles and the prefabricated caps.

[0023] The present invention has the following beneficial effects:

[0024] In the specific operation of the connection structure between the steel pipe pile and the prefabricated foundation, the construction method and the support structure described in the present invention, an end plate is provided at the upper end of the steel pipe pile, and grouting material is filled between the steel pipe pile and the connecting plate and the inner wall of the embedded steel pipe. The connecting piece passes through the connecting plate and the end plate to connect the connecting plate and the end plate, that is, a combination of mechanical connection and grouting and bonding is adopted to ensure the connection reliability between the two, while taking into account the precision error in the micro-pile construction process, and the practicability is extremely strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a structural diagram of the present invention;

[0027] Figure 2 is a structural diagram of a steel pipe pile 1;

[0028] Figure 3 It is a structural diagram of the connecting plate 4.

[0029] Among them, 1 is a steel pipe pile, 2 is a prefabricated foundation, 3 is a connecting piece, 4 is a connecting plate, 5 is a grouting material, 6 is an embedded part, 7 is an embedded steel pipe, 8 is a cushion layer, and 9 is a positioning ring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] As is known, cement-based micro-expansion grouting material is a high-performance building material, mainly composed of cement, mineral admixtures, retarders, thickeners and other materials, with micro-expansion properties. The following is a detailed introduction to cement-based micro-expansion grouting material: Performance characteristics: Micro-expansion: Cement-based micro-expansion grouting material will produce a certain volume expansion during the hydration process. This micro-expansion property can effectively reduce the interface stress between concrete and grouting materials, and improve the integrity and strength of the structure. High strength: The grouting material has high compressive and flexural strength, and can meet the requirements of various mechanical equipment and electrical equipment for the strength of grouting materials. High bonding force: It has good bonding properties with concrete and other substrates, and can quickly bond with concrete structures to form a high-strength and high-toughness composite structure. Good durability: It has excellent durability and can withstand erosion in various harsh environments for a long time, such as acid and alkali corrosion, salt spray corrosion, etc. Convenient construction: It can be used after adding a certain amount of water and stirring evenly on site. The construction process is simple and easy to operate. Application scope: Cement-based micro-expansion grouting materials are widely used in the reinforcement and repair projects of various concrete structures, such as: Bridge reinforcement: used for the reinforcement and repair of bridge piers and bridge decks to improve the bearing capacity and durability of bridges. Equipment foundation grouting: used for the installation of various mechanical equipment and electrical equipment, including the primary grouting and secondary grouting of the equipment foundation that requires high-precision installation. Building reinforcement and reconstruction: used for the reinforcement and reconstruction of building structures, such as the pouring of beam-column joints, deformation joints, and construction joints. Road emergency repair: used for emergency repair construction in roads, tunnels, airports and other projects to improve project quality and efficiency.

[0039] Embodiment 1

[0040] refer to Figure 1 , Figure 2 and Figure 3 The connection structure between the steel pipe pile and the prefabricated cap described in the present invention comprises a connector 3, a prefabricated cap 2 and a steel pipe pile 1; a connecting plate 4 is provided on the top of the prefabricated cap 2, an embedded steel pipe 7 is provided in the prefabricated cap 2, the top of the embedded steel pipe 7 is closed by the connecting plate 4, a cushion layer 8 is provided on the bottom of the prefabricated cap 2, the upper end of the steel pipe pile 1 passes through the cushion layer 8 and is inserted into the embedded steel pipe 7, an end plate is provided on the upper end of the steel pipe pile 1, and grouting material 5 is filled between the steel pipe pile 1 and the connecting plate 4 and the inner wall of the embedded steel pipe 7. Preferably, the grouting material 5 is a cement-based micro-expansion grouting material, and the connector 3 passes through the connecting plate 4 and the end plate to connect the connecting plate 4 with the end plate.

[0041] In addition, the present embodiment further includes a plurality of embedded parts 6, the lower end of each embedded part 6 is embedded in the prefabricated base 2, the upper end of each embedded part 6 passes through the connecting plate 4, the embedded part 6 is connected to the connecting plate 4, and each embedded part 6 is evenly distributed around the connecting part 3 along the circumferential direction, so that when the connecting part 3 is loosened from any direction, each embedded part 6 can play a lifting role.

[0042] The connecting plate 4 is provided with a central opening for the connecting member 3 to pass through and peripheral openings for the embedded member 6 to pass through. The diameter of the central opening is larger than the diameter of the connecting member. The axis of the steel pipe pile 1 and the axis of the embedded steel pipe 7 may not coincide.

[0043] It should be noted that the connection between the steel pipe pile 1 and the prefabricated foundation 2 in the present invention adopts a combination of mechanical connection and grouting and bonding, which not only ensures the connection reliability between the two, but also takes into account the precision error in the micropile construction process. The on-site construction is simple, convenient and fast. The upper tower can be erected after 7 days, which can meet the needs of rapid construction of power grid projects.

[0044] Embodiment 2

[0045] refer to Figure 1 , Figure 2 and Figure 3A certain power research institute adopts the connection structure of the micro steel pipe pile and the reinforced concrete prefabricated cap by the above-mentioned bolt mechanical connection and grouting bonding connection composite, wherein M56 connecting bolts are selected as the connecting parts 3, M24 bolts made of 45# steel are selected as the embedded parts 6, and the prefabricated cap 2 is a reinforced concrete prefabricated cap 2. In addition, a positioning ring 9 and an anchor plate are welded on the outer wall of the embedded steel pipe 7, the lower end of the M24 bolt is located on the anchor plate, and the upper end of the M24 bolt passes through Each positioning ring 9 and the connecting plate 4 are sleeved with nuts. Specifically, an M24 bolt made of 45# steel is embedded in the prefabricated cap 2 to form an anchor and an embedded steel pipe 7, forming an embedded steel pipe 7 that passes through from top to bottom. The inner diameter of the embedded steel pipe 7 is 100mm to 150mm larger than the diameter of the steel pipe pile 1. The diameter of the steel pipe pile 1 is generally 152mm, 203mm, or 219mm. The height of the prefabricated cap 2 made of Q235 or Q355B is at least 400mm. The exposed height of the steel pipe pile 1 is lower than the height of the prefabricated cap 2. The top of the steel pipe pile 1 is preset with an M56 connecting bolt made of 45# carbon structural steel, which passes through the embedded steel pipe 7 of the prefabricated cap 2 and is fastened and connected with the embedded bolts of the prefabricated cap 2 through the connecting plate 4. The diameter of the opening in the middle of the connecting plate 4 is Φ80mm, and the diameter of the outer opening is Φ30mm. The number of openings is consistent with the number of M24 embedded bolts of the prefabricated foundation 2. The plate thickness is 20-40mm, and the material is Q355B. The central opening size of the connecting plate 4 is larger than the diameter of the pile top connecting bolt of the steel pipe pile 1, which solves the construction accuracy error problem of the deviation and inclination of the micro steel pipe pile 1.

[0046] The steel pipe pile 1 is connected to the prefabricated foundation 2 by grouting. An early-strength cement-based slightly expansive grouting material is poured between the steel pipe pile 1 and the embedded steel pipe 7. The strength grade is not less than C60. During construction, it can be poured from the hole mouth. Before pouring, the debris on the exposed part of the steel pipe pile 1 needs to be cleaned up. The addition ratio of cement-based slightly expansive grouting material to mixing water is about 13%. The grouting connection solves the problem of construction accuracy error of the uncontrolled construction elevation of the steel pipe pile 1.

[0047] In addition, after the construction was completed, field tests were carried out on the foundation pull-out and compressive bearing characteristics of several 2×2 arranged micro steel pipe piles 1 with precast reinforced concrete caps 2. The bearing capacity test results were good, and the project was piloted and promoted in the supporting project, with generally good feedback from the construction units.

[0048] Embodiment 3

[0049] refer to Figure 1 , Figure 2 and Figure 3The present embodiment discloses a construction method for a connection structure between a steel pipe pile and a prefabricated cap, wherein the connection structure between the steel pipe pile 1 and the prefabricated cap 2 comprises a connection piece 3, a prefabricated cap 2 and a steel pipe pile 1; a connection plate 4 is provided on the top of the prefabricated cap 2, a pre-buried steel pipe 7 is provided in the prefabricated cap 2, and the top of the pre-buried steel pipe 7 is closed by the connection plate 4, the upper end of the steel pipe pile 1 is inserted into the pre-buried steel pipe 7, an end plate is provided on the upper end of the steel pipe pile 1, grouting material 5 is filled between the steel pipe pile 1 and the connection plate 4 and the inner wall of the pre-buried steel pipe 7, and the connection piece 3 passes through the connection plate 4 and the end plate to connect the connection plate 4 with the end plate; specifically, the construction method for the connection structure between the steel pipe pile and the prefabricated cap comprises the following steps:

[0050] 1) manufacturing the prefabricated foundation 2;

[0051] Specifically, the prefabricated foundation 2 is manufactured in the factory.

[0052] 2) Install the steel pipe pile 1 in place;

[0053] Specifically, after the steel pipe pile 1 is transported to a certain location, it is driven into the ground using a pile driver.

[0054] 3) Sleeve the prefabricated cap 2 onto the steel pipe pile 1, and connect the connector 3 to the end plate at the upper end of the steel pipe pile 1;

[0055] 4) pouring the grouting material 5 , installing the connecting plate 4 , and connecting the connecting plate 4 with the connecting piece 3 .

[0056] Embodiment 4

[0057] refer to Figure 1 , Figure 2 and Figure 3 The present embodiment discloses a supporting structure, which includes a column and a connecting structure between a steel pipe pile and a prefabricated cap, wherein the connecting structure between the steel pipe pile and the prefabricated cap includes a connecting piece 3, a prefabricated cap 2 and a steel pipe pile 1; a connecting plate 4 is provided on the top of the prefabricated cap 2, a pre-buried steel pipe 7 is provided in the prefabricated cap 2, and the top of the pre-buried steel pipe 7 is closed by the connecting plate 4, the upper end of the steel pipe pile 1 is inserted into the pre-buried steel pipe 7, an end plate is provided on the upper end of the steel pipe pile 1, and grouting material 5 is filled between the steel pipe pile 1 and the connecting plate 4 and the inner wall of the pre-buried steel pipe 7, the connecting piece 3 passes through the connecting plate 4 and the end plate to connect the connecting plate 4 with the end plate, the connecting structure between the steel pipe pile 1 and the prefabricated cap 2 is located underground, and the lower end of the column is located on the prefabricated cap 2 in the connecting structure between the steel pipe pile 1 and the prefabricated cap 2.

[0058] In addition, it should be noted that the number of the steel pipe piles 1 in the present invention is multiple, wherein each steel pipe pile 1 is evenly distributed along the circumferential direction, and at the same time, a plurality of embedded steel pipes 7 and a plurality of connecting plates 4 are arranged on the prefabricated cap 2, wherein one steel pipe pile 1 corresponds to one embedded steel pipe 7 and one connecting plate 4, and correspondingly, each embedded steel pipe 7 is evenly distributed along the circumferential direction. Each connecting plate 4 is arranged around the column.

[0059] Embodiment 5

[0060] refer to Figure 1 , Figure 2 and Figure 3 The present embodiment discloses a construction method of a support structure, wherein the support structure includes a column and a connection structure of a steel pipe pile and a prefabricated cap, wherein the connection structure of the steel pipe pile and the prefabricated cap includes a connector 3, a prefabricated cap 2 and a steel pipe pile 1, wherein the number of the steel pipe piles 1 is multiple, wherein each steel pipe pile 1 is evenly distributed along the circumferential direction, and at the same time, a plurality of embedded steel pipes 7 and a plurality of connecting plates 4 are arranged on the prefabricated cap 2, wherein one steel pipe pile 1 corresponds to one embedded steel pipe 7 and one connecting plate 4, and correspondingly, each embedded steel pipe 7 is evenly distributed along the circumferential direction. Each connecting plate 4 is arranged around the column.

[0061] Specifically, the construction method of the support structure includes the following steps:

[0062] 1) Producing the prefabricated foundation 2 in a factory;

[0063] 2) driving each steel pipe pile 1 into the ground by a pile driver;

[0064] 3) Install the cushion layer 8, install the prefabricated cap 2, and insert each steel pipe pile 1 into the embedded steel pipe 7 of the prefabricated cap 2;

[0065] 4) Install the connecting parts 3, pour the grouting material 5, and install the connecting plate 4.

[0066] It should be noted that the present invention proposes a connection method of a composite of bolt mechanical connection and grouting bonding for the connection between micro steel pipe piles and reinforced concrete prefabricated caps for power transmission line foundations. On the one hand, a mechanically reliable connection between the steel pipe piles 1 and the prefabricated caps 2 is achieved to meet the bearing performance requirements under various working conditions such as upward pulling, downward pressing and horizontal. On the other hand, the construction accuracy errors such as pile position deviation, inclination, and uncontrolled pile top elevation during the micro pile construction process can be taken into account, and finally the construction requirement of the upper tower can be erected within 7 days after the foundation construction is completed.

[0067] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0068] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A connection structure between a steel pipe pile and a prefabricated cap, characterized in that: It comprises a connecting piece (3), a prefabricated cap (2) and a steel pipe pile (1); A connecting plate (4) is provided at the top of the prefabricated foundation (2), a pre-buried steel pipe (7) is provided inside the prefabricated foundation (2), the top of the pre-buried steel pipe (7) is closed by the connecting plate (4), the upper end of the steel pipe pile (1) is inserted into the pre-buried steel pipe (7), an end plate is provided at the upper end of the steel pipe pile (1), grouting material (5) is filled between the steel pipe pile (1) and the connecting plate (4) and the inner wall of the pre-buried steel pipe (7), and the connecting piece (3) passes through the connecting plate (4) and the end plate to connect the connecting plate (4) with the end plate.

2. The connection structure between the steel pipe pile and the prefabricated cap according to claim 1 is characterized in that: A cushion layer (8) is provided at the bottom of the prefabricated foundation (2), and the steel pipe pile (1) passes through the cushion layer (8) and is inserted into the embedded steel pipe (7).

3. The connection structure between the steel pipe pile and the prefabricated cap according to claim 1 is characterized in that: It also includes a plurality of embedded parts (6), the lower end of each embedded part (6) is embedded in the prefabricated support platform (2), the upper end of each embedded part (6) passes through the connecting plate (4), and the embedded part (6) is connected to the connecting plate (4).

4. The connection structure between the steel pipe pile and the prefabricated cap according to claim 3 is characterized in that: The embedded parts (6) are evenly distributed in the circumferential direction.

5. The connection structure between the steel pipe pile and the prefabricated cap according to claim 3 is characterized in that: The embedded parts (6) are located around the connecting part (3).

6. The connection structure between the steel pipe pile and the prefabricated cap according to claim 3 is characterized in that: The connecting plate (4) is provided with a central opening for the connecting piece (3) to pass through and peripheral openings for the embedded piece (6) to pass through, and the diameter of the central opening is greater than the diameter of the connecting piece (3).

7. The connection structure between the steel pipe pile and the prefabricated cap according to claim 3 is characterized in that: The axis of the steel pipe pile (1) and the axis of the embedded steel pipe (7) may not coincide with each other.

8. The connection structure between the steel pipe pile and the prefabricated cap according to claim 3 is characterized in that: The grouting material (5) is a cement-based micro-expansion grouting material.

9. A construction method for the connection structure between the steel pipe pile and the prefabricated cap according to claim 1, characterized in that: The following steps are involved: Making the prefabricated foundation (2); Installing the steel pipe pile (1) in place; The prefabricated cap (2) is sleeved onto the steel pipe pile (1), and the connecting piece (3) is connected to the end plate at the upper end of the steel pipe pile (1); The grouting material (5) is poured, the connecting plate (4) is installed, and the connecting plate (4) is connected to the connecting piece (3).

10. A support structure, characterized in that: It comprises a column and a connection structure between a steel pipe pile and a prefabricated cap as claimed in any one of claims 1 to 8, wherein the connection structure between the steel pipe pile and the prefabricated cap is located below the ground, and the lower end of the column is located on the prefabricated cap (2) in the connection structure between the steel pipe pile and the prefabricated cap.

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