Prefabricated component and method suitable for connecting circular permanent support pile wall and outrigger support

Abstract

The present invention relates to the field of foundation pit engineering technology, and provides a prefabricated component and method suitable for connecting a circular permanent support pile wall with an outrigger support. The prefabricated component includes an outrigger support connection device and a positioning and fixing device fixed to the steel cage; the outrigger support connection device includes a steel plate, a sealing cover, and an embedded part. The two open ends of the embedded part are arranged along the radial direction of the steel cage, and the open end of the embedded part facing away from the steel cage can be opened and closed with the sealing cover. The other open end of the embedded part is covered and connected with a prefabricated connection plate; a reserved hole is provided on the steel plate, and the outrigger support main reinforcement is fixed in the reserved hole; the embedded part is provided with a clamping hole at both ends along the axial direction of the steel cage, and the steel cage main reinforcement passes through the clamping hole and is welded to it. This solution achieves precise positioning of the outrigger support main reinforcement. The prefabricated component adopts a modular design, which improves the level of standardization, is conducive to the promotion of permanent support structures, and comprehensively improves engineering effects and construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit engineering, and in particular to a prefabricated component and a method suitable for connecting a circular permanent support pile wall with an outrigger support. Background Art

[0002] Permanent support structures for deep foundation pits, a key indicator and direction for high-quality development in foundation pit engineering, are gaining increasing industry recognition and are being rapidly adopted. Currently, the CECS "Technical Specification for Permanent Support Structures for Deep Foundation Pit" has been released and implemented. Double-wall, separate-wall permanent support structures require connections to external supports. The construction of these connections is crucial, and their quality directly impacts the overall stability and safety of the foundation pit. Currently, the most commonly used construction methods are pre-embedded connectors and post-embedded reinforcement.

[0003] The pre-embedded connector method requires pre-reinforcement of the piles through binding and welding. However, this method has numerous drawbacks. For one thing, the reliability of its connection is poor, making it difficult to achieve ideal strength at the connection nodes. When subjected to significant external forces, the nodes are prone to loosening, breaking, and other safety hazards. Furthermore, during concrete pouring, the pre-embedded connectors are susceptible to positional deviations due to factors such as vibration. This not only weakens the bearing capacity of the connection nodes but also complicates the subsequent connection to the extended support reinforcement, increasing construction difficulty and time costs.

[0004] The subsequent rebar embedding method involves inserting the extended support reinforcement into the pile. However, this method faces the challenge of accurately determining the position of the main reinforcement within the pile during construction, which greatly increases the blindness of the construction operation. Furthermore, its construction process is more complex than the pre-embedded connector method. From drilling and cleaning to rebar embedding and maintenance, numerous uncertainties are involved. Deviations in any of these steps can seriously affect the embedding effect and the quality of the node connection.

[0005] In summary, the current pre-embedded connector method and post-embedded reinforcement method have failed to establish a stable and reliable connection mode within the pile, and are inefficient, which is not conducive to the promotion of permanent support structures. It also poses potential risks to the overall safety of foundation pit projects. It is urgent to develop a more optimized, reliable, and standardized component connection solution to meet the connection requirements of circular permanent support pile walls and outrigger supports, and ensure the safe and stable operation of foundation pit projects. Summary of the Invention

[0006] In order to solve the problems existing in the background technology, the present invention proposes prefabricated components and methods suitable for connecting circular permanent support pile walls with outrigger supports, which realizes the precise positioning of the main reinforcement of the outrigger supports and ensures the reliability of the connection. The prefabricated components can be processed in a standardized manner, which improves the level of standardization, enhances the controllability of quality, and comprehensively improves the engineering effect and construction efficiency.

[0007] To achieve the above object, the present invention adopts the following scheme:

[0008] A prefabricated component adapted for connecting a circular permanent retaining pile wall to an outrigger support, the retaining pile wall comprising a steel cage with a plurality of main steel cage bars arranged axially along the steel cage, the prefabricated component comprising an outrigger support connection device fixed to the steel cage and a positioning and fixing device;

[0009] The outward extending support connection device includes a steel plate, a sealing cover and an embedded part, the embedded part is a box-shaped structure with openings at both ends, the two open ends of the embedded part are arranged along the radial direction of the steel cage, the open end of the embedded part away from the steel cage can be opened and closed connected to the sealing cover, and the other open end of the embedded part is covered and connected with a prefabricated connecting plate; the steel plate is fixed to the inside of the embedded part near one end of the sealing cover, the steel plate is provided with a reserved hole, the reserved hole is fixed with an outward extending support main reinforcement, the outward extending support main reinforcement is arranged along the radial direction of the supporting pile wall, and extends from the reserved hole in a direction away from the steel cage; the embedded part is provided with a clamping hole at both ends along the axial direction of the steel cage, the steel cage main reinforcement passes through the clamping hole and is welded to it; the positioning and fixing device is used to fix the two ends of the outward extending support connection device in the axial direction of the steel cage.

[0010] Preferably, the arrangement of the reserved holes matches the number and position of the outwardly extending supporting main ribs.

[0011] Preferably, guide grooves are provided on both end faces of the embedded part along the axial direction of the steel cage, and baffles are welded on the inner sides of the two end faces respectively, and the baffles are provided with card slots, the guide grooves open inward from one end of the embedded part close to the prefabricated connecting plate, and the card slots open inward from one end of the baffle close to the steel plate.

[0012] Preferably, the engaging hole is formed by overlapping the guide groove and the engaging groove located at the same end.

[0013] Preferably, the positioning and fixing device includes two frame bars, which are located at both ends of the embedded part, arranged along the circumferential direction of the steel cage, and fixed to the main bars of the steel cage.

[0014] Preferably, the steel plate is welded to the inner edge of the embedded part.

[0015] Preferably, one end of the sealing cover is connected to the embedded part through a hinge.

[0016] A method for connecting a circular permanent retaining pile wall with an outrigger includes the following steps:

[0017] Step 1, prefabricate the outrigger support connection device: weld the steel plate with the reserved hole to either end of the embedded part, and then install an openable sealing cover at the open end of the embedded part close to the steel plate to form an outrigger support connection device; Step 2, fix the outrigger support connection device to the steel cage: determine the outrigger support position according to the design drawing, weld the outrigger support connection device to the main reinforcement of the steel cage through the guide groove, and then fix two frame bars along the circumference of the cross section of the steel cage. The two frame bars are welded to the two ends of the outrigger support connection device respectively, and at the same time ensure that the side of the steel cage connected to the outrigger support connection device is facing the inside of the foundation pit; Step 3, anti-seepage treatment: weld baffles on the inner side of the two ends of the embedded part along the axial direction of the steel cage, and the baffles are clamped The main reinforcement of the steel cage in the groove and the outrigger support connecting device is clamped and welded to fix. After confirming that the connection is reliable, the open end of the embedded part away from the sealing cover is covered and welded with a prefabricated connecting plate; Step 4, concrete pouring: When constructing the support pile wall, the steel cage and the outrigger support connecting device are cast as a whole, the slump is controlled in the range of 160-180mm, and the layers are vibrated and compacted; Step 5, connecting the support pile wall and the outrigger support: at the connection position of the outrigger support and the support pile wall, the concrete is cut along the radial direction of the support pile wall to the sealing cover, and after opening the sealing cover, the main reinforcement of the outrigger support is implanted in the reserved hole of the steel plate, and after confirming that the main reinforcement of the outrigger support is horizontal, it is spot welded to the reserved hole of the steel plate. According to the needs of the project, prestress is applied to the main reinforcement of the outrigger support after spot welding.

[0018] Preferably, in step five, the conditions for the connection construction of the supporting pile wall and the outrigger support are: the main structure construction is carried out when the concrete strength of the integrally cast steel cage and the outrigger support connection device reaches 100%, and the outrigger support is connected to the supporting pile wall when the main structure is constructed to the same height as the outrigger support connection device.

[0019] The present invention has the following beneficial effects: First, this solution connects the circular permanent support pile wall to the outrigger through prefabricated components. The prefabricated components include an outrigger connection device and a positioning and fixing device. The outrigger connection device adopts a modular design and can be processed in a standardized manner, which improves the level of standardization, reduces on-site welding, and improves construction efficiency. The embedded parts, sealing covers, baffles, and prefabricated connecting plates make the outrigger connection device a relatively sealed box, preventing hole blockage caused by concrete infiltration, ensuring connection reliability, and enhancing the quality controllability of the connection nodes. Furthermore, the steel plates fixed to the embedded parts are provided with reserved holes that match the main reinforcement of the outrigger, enabling precise positioning with the main reinforcement of the outrigger.

[0020] Secondly, the proposed construction method for connecting the circular permanent retaining pile wall and the extended support based on prefabricated components solves the pain points of traditional connection failure and establishes a reliable connection system between the retaining pile wall and the extended support, which is conducive to the promotion of permanent support structures. The use of guide groove embedding and double-frame vertical reinforcement for circumferential fixation reduces the positioning error between the embedded parts and the main reinforcement of the steel cage. During construction, the embedded part guide groove first embeds the main reinforcement of the steel cage, and the baffle groove further secures the main reinforcement of the steel cage and is welded to the embedded part to form a clamping hole for the main reinforcement of the steel cage. The open end of the embedded part is then covered with a welded prefabricated connecting plate to ensure the sealing of the extended support connection device. A steel plate with a reserved hole is welded to the embedded part body and an openable sealing cover is installed to create conditions for subsequent connection while protecting the internal structure. When connecting the retaining pile wall and the extended support, radial cutting, implantation of the extended support main reinforcement, and application of prestressing achieve a rigid connection and coordinated force between the two, greatly improving the overall stability and safety of the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the node structure of the circular permanent retaining pile wall and the outrigger support of the present invention;

[0022] Figure 2 This is a schematic diagram of the front view of the structure of the outward-extending support connecting device of the present invention placed inside the pile;

[0023] Figure 3 A flow chart of a method for connecting a circular permanent retaining pile wall with an outrigger support adapted to the present invention;

[0024] Figure 4 It is a structural schematic diagram of the outward-extending support connecting device and the baffle clamping the main reinforcement of the steel cage according to the present invention.

[0025] Numbers in the figure: 1. Steel cage; 2. Steel plate; 3. Sealing cover; 4. Embedded parts; 5. Prefabricated connecting plate; 6. Reserved hole; 7. Snap-in hole; 8. Guide groove; 9. Snap-in groove; 10. Baffle; 11. Frame reinforcement; 12. Main reinforcement of the steel cage; 13. Main reinforcement of the extended support. DETAILED DESCRIPTION

[0026] In order to make the present invention clearer and more understandable, the present invention is described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the embodiment given is only one implementation method and does not represent all embodiments.

[0027] Example 1

[0028] Combine Figure 1-Figure 4This embodiment provides a prefabricated component suitable for connecting a circular permanent retaining pile wall with an outrigger support. The retaining pile wall includes a steel cage 1, and a plurality of main steel cage bars 12 are arranged axially along the steel cage 1. The prefabricated component includes an outrigger support connection device fixed to the steel cage 1 and a positioning and fixing device.

[0029] The outward extending support connecting device includes a steel plate 2, a sealing cover 3 and an embedded part 4. The embedded part 4 is a box-shaped structure with openings at both ends. The two open ends of the embedded part 4 are arranged along the radial direction of the steel cage 1. The open end of the embedded part 4 away from the steel cage 1 can be opened and closed with the sealing cover 3, and the other open end of the embedded part 4 is covered and connected with a prefabricated connecting plate 5; the steel plate 2 is fixed to the inside of the embedded part 4 near one end of the sealing cover 3, and a reserved hole 6 is provided on the steel plate 2. An outward extending support main reinforcement 13 is fixed in the reserved hole 6. The outward extending support main reinforcement 13 is arranged along the radial direction of the supporting pile wall and extends from the reserved hole 6 in the direction away from the steel cage 1; the embedded part 4 is provided with a clamping hole 7 at both ends along the axial direction of the steel cage 1, and the steel cage main reinforcement 12 passes through the clamping hole 7 and is welded to it; the positioning and fixing device is used to fix the two ends of the outward extending support connecting device in the axial direction of the steel cage 1.

[0030] The embedded components 4, with openings at both ends, the sealing cover 3, and the prefabricated connecting plate 5 form a relatively sealed box, preventing hole blockage caused by concrete infiltration and ensuring a reliable connection. It should be noted that the prefabricated connecting plate 5 is coated with a waterproofing agent to prevent moisture penetration. The modular assembly structure of the outrigger connecting device reduces the number of custom-shaped parts to be processed, thereby reducing construction costs.

[0031] Specifically, the arrangement of the pre-set holes 6 matches the number and location of the extended support bars 13. That is, the pre-set holes 6 are precisely targeted and adaptable. Specifically, the number and specific location of the extended support bars 13 must be carefully considered. Based on the actual distribution of the extended support bars 13, the arrangement and layout of the pre-set holes 6 on the relevant components should be rationally planned to ensure that the extended support bars 13 can smoothly and accurately pass through the pre-set holes 6, achieving a stable and reliable connection between the two and enhancing the controllability of construction quality.

[0032] Specifically, the embedded part 4 is provided with guide grooves 8 on both end faces along the axial direction of the steel cage 1, and baffles 10 are welded on the inner sides of the two end faces, and the baffles 10 are provided with clamping grooves 9. In order to facilitate operation during construction, the guide grooves 8 are opened inward from the end of the embedded part 4 close to the prefabricated connecting plate 5, which is convenient for embedding the main reinforcement 12 of the steel cage. The clamping grooves 9 are opened inward from the end of the baffle 10 close to the steel plate 2, and are arranged opposite to the open end of the guide grooves 8 to facilitate cooperation with the guide grooves 8 to further clamp the main reinforcement 12 of the steel cage passing through the embedded part 4. The clamping hole 7 is formed by the overlapping of the guide grooves 8 and the clamping grooves 9 located at the same end, so as to prevent the concrete from seeping into the embedded part 4 along the gaps in the guide grooves 8 during pouring, thereby avoiding the situation where the main reinforcement 13 of the extended support cannot be embedded in the extended support connection device.

[0033] Specifically, the positioning and fixing device includes two frame bars 11, which are located at both ends of the embedded part 4, arranged along the circumference of the steel cage 1, and fixed to the main steel cage bars 12. The frame bars 11 are welded to the outrigger support connection device to enhance the integrity of the supporting pile wall and the outrigger support, distribute the force applied to the outrigger support connection device to the entire steel cage 1, and reduce local stress concentration.

[0034] As a preferred solution, the steel plate 2 is welded to the inner edge of the embedded part 4 to ensure that the steel plate 2 and the embedded part 4 become one. One end of the sealing cover 3 is connected to the embedded part 4 through a hinge. In the later stage of construction, the staff can easily open the sealing cover 3 by rotating the hinge, which provides convenience for the subsequent installation of the extended supporting main reinforcement 13, greatly improving the convenience and operability of construction.

[0035] Example 2

[0036] This embodiment provides a method for connecting a circular permanent retaining pile wall with an outrigger support, comprising the following steps:

[0037] Step 1: Prefabricate the overhanging support connection: Weld a steel plate 2 with pre-set holes 6 to either end of the embedded component 4. Then, install a removable sealing cover 3 on the open end of the embedded component 4 near the steel plate 2 to form the overhanging support connection. The overhanging support connection can be prefabricated in the factory, reducing on-site welding and adjustment workload, shortening the construction period, and improving installation accuracy. Before shipment, the overhanging support connection can be dimensional-calibrated to ensure compliance with design requirements. In particular, the pre-set holes 6 must be aligned with the layout of the overhanging support main reinforcement 13.

[0038] Step 2, fix the extended support connection device to the steel cage 1: determine the extended support position according to the design drawings, fit the extended support connection device with the main reinforcement 12 of the steel cage through the guide groove 8 and then weld it to fix it, then fix two frame bars 11 along the circumference of the cross section of the steel cage 1, and weld the two frame bars 11 to the two ends of the extended support connection device respectively, while ensuring that the side of the steel cage 1 connected to the extended support connection device is facing the inside of the foundation pit. The setting of the guide groove 8 enhances the contact area between the extended support connection device and the main reinforcement 12 of the steel cage, forming a rigid connection after welding, and effectively transferring the load. At the same time, the welding position needs to avoid the area where the main reinforcement 12 of the steel cage is subjected to greater force to ensure that the strength of the main reinforcement 12 of the steel cage is not affected. Through precise positioning, rigid connection and structural reinforcement, the coordinated force of the extended support connection device and the steel cage 1 is achieved, which not only ensures the construction accuracy, but also improves the bearing capacity and anti-deformation performance of the overall structure, laying the foundation for the subsequent foundation pit support and extended support construction.

[0039] Step 3: Anti-seepage treatment: Baffles 10 are welded to the inner sides of the embedded components 4 along the axial direction of the steel cage 1. The slots 9 of the baffles 10 engage with the main reinforcement cage bars 12 in the extended support connection device and are then welded securely. After confirming the connection is secure, a prefabricated connecting plate 5 is welded to the open end of the embedded component 4 away from the sealing cover 3. This step, through the welding of the baffles 10, the engagement of the slots 9, and the covering of the prefabricated connecting plate 5, forms a multi-layered anti-seepage barrier, effectively blocking the leakage path and improving the sealing of the extended support connection device. The prefabricated connecting plate 5 can be made of Q235B steel plate 2, and the surface of the Q235B steel plate 2 is sandblasted to increase the roughness of the weld joint.

[0040] Step 4, concrete pouring: When constructing the support pile wall, cast the steel cage 1 and the outward support connection device as a whole, control the slump within the range of 160-180mm, and vibrate and compact them layer by layer to ensure that the outward support connection device and the steel cage 1 are evenly wrapped with concrete to form a high-strength and well-dense support pile wall structure.

[0041] Step 5, connecting the supporting pile wall and the outrigger support: when the concrete strength of the integrally cast steel cage 1 and the outrigger support connecting device reaches 100%, the main structure is constructed. When the main structure is constructed to the same height as the outrigger support connecting device, the outrigger support is connected to the supporting pile wall. At the connection position of the outrigger support and the supporting pile wall, the concrete is cut along the radial direction of the supporting pile wall to the sealing cover 3. After opening the sealing cover 3, the outrigger support main reinforcement 13 is implanted in the reserved hole 6 of the steel plate 2. After confirming that the outrigger support main reinforcement 13 is horizontal, it is spot welded to the reserved hole 6 of the steel plate 2. According to the project requirements, prestress is applied to the outrigger support main reinforcement 13 after spot welding. This step achieves a rigid connection and coordinated force between the supporting pile wall and the external support through precise sectioning, implantation of the external support main reinforcement 13 and prestressing. Radial sectioning ensures that the implantation angle of the external support main reinforcement 13 is consistent with the axis of the embedded part 4, ensuring that the external support can achieve the best coordinated force state with the external support connection device and the supporting pile wall when subjected to force. In addition, after implanting the external support main reinforcement 13, its horizontal state must be carefully confirmed. Only when the external support main reinforcement 13 is in a horizontal position can the external support be uniformly stressed in the horizontal direction, avoiding the generation of additional bending moment or torque during use of the external support due to the inclination of the main reinforcement, which affects the normal working performance of the structure. When the project requires the application of prestress, a through-type jack can be used in conjunction with a pressure sensor to tension the external support to the design value in stages.

[0042] In summary, the present invention uses prefabricated components of an outrigger support connection device and a positioning and fixing device to connect the circular permanent support pile wall with the outrigger support, thereby constructing a reliable connection system between the support pile wall and the outrigger support, which is conducive to the promotion of permanent support structures. The modular design of the outrigger support connection device improves the level of standardization, reduces on-site welding, and improves construction efficiency. The relatively sealed box body is constructed with embedded parts 4, etc., which avoids concrete infiltration and enhances the quality controllability at the connection node. Precise positioning with the outrigger support main reinforcement 13 is achieved through the reserved hole 6. Based on this, the proposed construction method solves the problem of traditional connection failure, reduces the positioning error by fitting the guide groove 8, ensures the sealing of the device during construction, creates conditions for connection and protects the internal structure, and finally realizes the rigid connection and coordinated force between the support pile wall and the outrigger support through radial cutting, implanting the outrigger support main reinforcement 13 and applying prestress, thereby improving the stability and safety of the building structure.

[0043] The specific embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned specific embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned specific embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the specific embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A prefabricated component adapted for connecting a circular permanent support pile wall with an outrigger support, the support pile wall comprising a steel cage (1), a plurality of steel cage main bars (12) being arranged along the axial direction of the steel cage (1), and characterized in that: The prefabricated component comprises an outwardly extending support connection device and a positioning and fixing device fixed to the steel cage (1); The outward-extending support connecting device comprises a steel plate (2), a sealing cover (3) and an embedded part (4); the embedded part (4) is a box-shaped structure with two opposite ends open; the two open ends of the embedded part (4) are arranged along the radial direction of the steel cage (1); the open end of the embedded part (4) facing away from the steel cage (1) is openably connected to the sealing cover (3); the other open end of the embedded part (4) is covered and connected with a prefabricated connecting plate (5); the steel plate (2) is fixed inside the embedded part (4) near one end of the sealing cover (3 ... ) is provided with a reserved hole (6), an outward-extending support main reinforcement (13) is fixed in the reserved hole (6), the outward-extending support main reinforcement (13) is arranged along the radial direction of the supporting pile wall, and extends from the reserved hole (6) in a direction away from the steel cage (1); the embedded part (4) is provided with a clamping hole (7) at both ends along the axial direction of the steel cage (1), the steel cage main reinforcement (12) passes through the clamping hole (7) and is welded to the same; the positioning and fixing device is used to fix the two ends of the outward-extending support connecting device in the axial direction of the steel cage (1).

2. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 1, characterized in that: The arrangement of the reserved holes (6) matches the number and position of the outwardly extending supporting main ribs (13).

3. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 1, characterized in that: The embedded part (4) is provided with guide grooves (8) on both end surfaces along the axial direction of the steel cage (1), and baffles (10) are respectively welded on the inner sides of the two end surfaces, and both baffles (10) are provided with a clamping groove (9), the guide groove (8) opens inward from one end of the embedded part (4) close to the prefabricated connecting plate (5), and the clamping groove (9) opens inward from one end of the baffle (10) close to the steel plate (2).

4. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 3, characterized in that: The clamping hole (7) is formed by overlapping the guide groove (8) and the clamping groove (9) located at the same end.

5. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 4, characterized in that: The positioning and fixing device comprises a frame rib (11), two of which are provided. The two frame ribs (11) are located at both ends of the embedded part (4), are arranged along the circumferential direction of the steel cage (1), and are fixed to the main ribs (12) of the steel cage.

6. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 1, characterized in that: The steel plate (2) is welded to the inner edge of the embedded part (4).

7. The prefabricated component adapted for connection between a circular permanent retaining pile wall and an outrigger according to claim 1, characterized in that: One end of the sealing cover (3) is connected to the embedded part (4) via a hinge.

8. A method for connecting a circular permanent retaining pile wall with an outrigger support, characterized in that: The method uses the prefabricated component adapted for connecting a circular permanent retaining pile wall with an outrigger support as claimed in claim 5, and comprises the following steps: Step 1: prefabricate the outward-extending support connection device: weld the steel plate (2) with the reserved hole (6) to either end of the embedded part (4), and then install an openable sealing cover (3) on the open end of the embedded part (4) close to the steel plate (2) to form the outward-extending support connection device; Step 2, fix the extension support connection device to the steel cage (1): determine the extension support position according to the design drawing, fit the extension support connection device with the main reinforcement (12) of the steel cage through the guide groove (8) and weld it to fix it, then fix two frame reinforcements (11) along the circumference of the cross section of the steel cage (1), and weld the two frame reinforcements (11) to the two ends of the extension support connection device respectively, and ensure that the side of the steel cage (1) connected to the extension support connection device is facing the inside of the foundation pit; Step 3, anti-seepage treatment: baffles (10) are welded to the inner sides of both ends of the embedded part (4) along the axial direction of the steel cage (1), the clamping groove (9) of the baffle (10) is clamped with the main reinforcement (12) of the steel cage in the extended support connection device and then welded and fixed. After confirming that the connection is reliable, the open end of the embedded part (4) away from the sealing cover (3) is covered and welded with a prefabricated connecting plate (5); Step 4, concrete pouring: When constructing the supporting pile wall, integrally pour the steel cage (1) and the outward supporting connection device, control the slump within the range of 160-180mm, and vibrate and compact the concrete layer by layer; Step 5, connecting the supporting pile wall and the outrigger support: at the connection position between the outrigger support and the supporting pile wall, cut the concrete along the radial direction of the supporting pile wall to the sealing cover (3), open the sealing cover (3), and implant the outrigger support main reinforcement (13) at the reserved hole (6) of the steel plate (2), confirm that the outrigger support main reinforcement (13) is horizontal, and then spot weld it to the reserved hole (6) of the steel plate (2), and apply prestress to the outrigger support main reinforcement (13) after spot welding according to engineering needs.

9. The method for connecting a circular permanent retaining pile wall with an outrigger according to claim 8, characterized in that: In step 5, the conditions for the connection construction of the supporting pile wall and the outrigger support are as follows: when the concrete strength of the integrally cast steel cage (1) and the outrigger support connection device reaches 100%, the main structure construction is carried out; when the main structure is constructed to the same height as the outrigger support connection device, the outrigger support and the supporting pile wall are connected.

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