Prefabricated tubular pile stand column steel supporting joint and construction method thereof

Abstract

The invention relates to the field of buildings, and discloses a prefabricated pipe pile stand column steel supporting node and a construction method thereof.The prefabricated pipe pile stand column steel supporting node comprises a prefabricated pipe pile stand column, a pile head is arranged at the top of the prefabricated pipe pile stand column, a micro-expansion concrete filling core is arranged in the prefabricated pipe pile stand column, and the bottom end of the micro-expansion concrete filling core is fixedly connected with a round thin steel plate through anchor bars; the top ends of the anchor bars are fixedly connected with anchor plates, overflow holes are formed in the anchor plates, and the top faces of the anchor plates are exposed out of the pile head. Longitudinal steel reinforcement frameworks and transverse stirrups are arranged in the pile head to form a steel reinforcement mesh cage, a micro-expansion concrete filling core is poured by adopting a layered pouring and layered vibrating process, and end hook type steel fibers are doped, so that concrete shrinkage can be compensated, cracks are inhibited, and meanwhile, the bending strength and the shearing strength of the pile head are enhanced; and the load of the steel support can be uniformly transmitted to the prefabricated tubular pile stand column through the anchor plate, so that the node has reliable bearing capacity and crack resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building technology, in particular to a prefabricated pipe pile column steel support node and a construction method thereof. BACKGROUND

[0002] In the pile and support structure of the foundation pit engineering, the vertical support member is usually combined by a column and a column pile, the column is usually an angle steel lattice column, a profile steel column, etc., and the column pile is usually a cast-in-place pile, a square pile, etc. At present, when the conditions permit, the engineering pile of the main structure is used as part of the support system in the engineering, and how to optimize the connection structure and construction process of the engineering pile column and the steel support becomes an important direction of the engineering technology.

[0003] In the prior art, the node connection structure of the engineering pile column and the steel support has the following deficiencies in the bearing capacity, crack resistance and load transmission efficiency: the overall strength of the pile head structure is weak, shrinkage cracks are easily generated after the concrete is poured, and the load transmission path between the steel support and the column is not clear enough, which may cause uneven stress of the node and affect the reliability and durability of the support system. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a prefabricated pipe pile column steel support node and a construction method thereof, which solves the problems of the prior art that the overall strength of the pile head structure is weak, shrinkage cracks are easily generated after the concrete is poured, and the load transmission path between the steel support and the column is not clear enough, which may cause uneven stress of the node and affect the reliability and durability of the support system.

[0005] To achieve the above purpose, the present application is implemented by the following technical solutions: a prefabricated pipe pile column steel support node, comprising: A prefabricated pipe pile column, a pile head is arranged at the top of the prefabricated pipe pile column, a micro-expansion concrete filling core is arranged in the prefabricated pipe pile column, the bottom end of the micro-expansion concrete filling core is fixedly connected with a circular thin steel plate through an anchor bar, the top end of the anchor bar is fixedly connected with an anchor plate, a overflow hole is arranged on the anchor plate, the top surface of the anchor plate is exposed from the pile head, and the number of anchor bars is not less than 4; A longitudinal steel reinforcement cage and a transverse stirrup are arranged in the pile head, the longitudinal steel reinforcement cage comprises a main reinforcement one and a main reinforcement two, the transverse stirrup comprises a stirrup one and a stirrup two, and the longitudinal steel reinforcement cage and the transverse stirrup are connected through binding; A steel support is arranged on the anchor plate, and the side surface of the steel support is connected with a channel steel through a fillet weld; The lower end of the prefabricated pipe pile column is embedded in the rock-soil body below the bottom of the foundation pit, and a water stop steel plate is arranged between the prefabricated pipe pile column and the bottom plate of the basement.

[0006] Preferably, the application also provides a construction method of a prefabricated tubular pile column steel support node, comprising the following steps: S1, hoist the prefabricated tubular pile column to the designed position and sink the pile to the steel support bottom; S2, clean the pile head, install the longitudinal steel reinforcement cage composed of main reinforcement one and main reinforcement two and the transverse stirrup composed of stirrup one and stirrup two, and connect the anchor bar with the round thin steel plate and the longitudinal steel reinforcement cage; S3, perform micro-expansion concrete pouring in the pile head, discharge air through the overflow hole on the anchor plate during pouring and monitor the pouring state, vibrate the concrete, and form a micro-expansion concrete filling core; S4, fixedly connect the anchor plate with the top end of the longitudinal steel reinforcement cage, erect the steel support on the anchor plate, and form a limiting structure by welding the channel steel.

[0007] Preferably, in the step S1, the prefabricated tubular pile column is sunk by static pressure, and the verticality deviation of the pile body during sinking is controlled to be not more than 0.5%.

[0008] Preferably, in the step S2, a concrete pouring height scale line is marked on the steel reinforcement cage.

[0009] Preferably, in the step S3, the micro-expansion concrete filling core pouring adopts a layered pouring and layered vibrating process, and the interval between layers during pouring is not more than 2 / 3 of the initial setting time of the concrete.

[0010] Preferably, the layered pouring and layered vibrating process comprises: the first layer is poured to 300mm above the round thin steel plate, and a diameter 50mm vibrating rod is inserted for vibration; the second layer is poured to 1 / 2 of the pile head height, and a diameter 30mm vibrating rod is used for supplementary vibration in the steel dense area; after the third layer is poured to the designed elevation, a flat plate vibrator is used for overall vibration for 1-2 minutes 2-3 hours before the initial setting of the concrete, and a diameter 25mm vibrating rod is used for intensive vibration around the anchor plate and the steel dense area.

[0011] Preferably, in the step S3, end hook type steel fibers are mixed in the micro-expansion concrete, the mixing amount is 1%-1.5% of the volume of the concrete, and the concrete slump is controlled to be 160-180mm.

[0012] Preferably, in the step S4, when the anchor plate is installed with the steel support, a symmetrical welding method is used to control the welding deformation.

[0013] Preferably, in the step S4, after the channel steel is welded with the steel support and the anchor plate, ultrasonic flaw detection is performed on the weld.

[0014] Preferably, in the step S3, during the pouring of the micro-expansion concrete, air is discharged through overflow holes in the anchor plate and the pouring height is monitored.

[0015] The application provides a prefabricated pipe pile column steel support node and a construction method thereof. 1. The application sets the longitudinal steel reinforcement cage and the transverse stirrup to form a steel mesh cage in the pile head, pours micro-expansion concrete filling cores by using the layered pouring and layered vibrating process, and combines with the mixed end hook type steel fiber to compensate for the concrete shrinkage, inhibit the crack generation, and simultaneously enhance the bending and shearing strength of the pile head.

[0016] 2. The application uses the prefabricated pipe pile as the column pile, and compared with the traditional cast-in-place pile, the prefabricated pipe pile has the characteristics of factory prefabrication, which saves the complex process and maintenance time of site pouring, significantly improves the construction efficiency, simultaneously, the material cost of the prefabricated pipe pile is lower, a large number of site operation equipment is not needed, the labor and mechanical investment is reduced, the engineering cost is effectively reduced, and the project economic index is improved.

[0017] 3. In the construction process, the application marks the concrete pouring height scale line on the steel reinforcement cage, uses the symmetrical welding to control the deformation, uses the overflow hole to monitor the pouring state, simplifies the construction operation process, improves the construction precision, the steel support is welded with the anchor plate to form the limiting structure, and the ultrasonic flaw detection is performed on the weld to ensure that the steel support and the prefabricated pipe pile column are firmly connected, effectively limit the horizontal and vertical displacement of the steel support, and guarantee the stability and safety of the whole pile support supporting system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a prefabricated pipe pile column and steel support connection schematic view of a prefabricated pipe pile column steel support node of the application; Figure 2 It is a main reinforcement local structure schematic view of a prefabricated pipe pile column steel support node of the application; Figure 3 It is a stirrup local structure schematic view of a prefabricated pipe pile column steel support node of the application; Figure 4 It is a prefabricated pipe pile head processing large sample schematic view of a prefabricated pipe pile column steel support node of the application; Figure 5 It is an anchor reinforcement local structure schematic view of a prefabricated pipe pile column steel support node of the application; Figure 6 It is an anchor plate local structure schematic view of a prefabricated pipe pile column steel support node of the application; Figure 7A channel steel local structure schematic view of a prefabricated pipe pile stand column steel support node of the present application; Figure 8 A steel support and pile head connection large sample view of a prefabricated pipe pile stand column steel support node of the present application; Figure 9 A construction method flow chart of a prefabricated pipe pile stand column steel support node of the present application.

[0019] 1, prefabricated pipe pile stand column; 2, foundation pit bottom; 3, water stop steel plate; 4, basement bottom plate; 5, pile head; 6, anchor plate; 7, channel steel; 8, steel support; 9, fillet weld; 10, micro-expansion concrete filling core; 11, main reinforcement one; 12, main reinforcement two; 13, stirrup one; 14, stirrup two; 15, anchor bar; 16, round thin steel plate; 17, overflow hole. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 9 The present application provides a prefabricated pipe pile stand column steel support node, which comprises: The prefabricated pipe pile stand column 1 is provided with a pile head 5 at the top, and a micro-expansion concrete filling core 10 is arranged in the prefabricated pipe pile stand column 1. The bottom end of the micro-expansion concrete filling core 10 is fixedly connected with a round thin steel plate 16 through an anchor bar 15, and the top end of the anchor bar 15 is fixedly connected with an anchor plate 6. The anchor plate 6 is provided with an overflow hole 17, and the top surface of the anchor plate 6 is exposed from the pile head 5. The number of anchor bars 15 is not less than 4. The pile head 5 is provided with a longitudinal steel reinforcement framework and a transverse stirrup. The longitudinal steel reinforcement framework comprises main reinforcement one 11 and main reinforcement two 12, and the transverse stirrup comprises stirrup one 13 and stirrup two 14. The longitudinal steel reinforcement framework and the transverse stirrup are connected through binding. The steel support 8 is arranged on the anchor plate 6, and the side surface of the steel support 8 is connected with the channel steel 7 through the fillet weld 9 formed by welding. The lower end of the prefabricated pipe pile stand column 1 is embedded in the rock-soil body below the foundation pit bottom 2, and the water stop steel plate 3 is arranged between the prefabricated pipe pile stand column 1 and the basement bottom plate 4.

[0022] Specifically, the prefabricated pipe pile column 1 is a foundation bearing component, the top pile head 5 is a key area for connecting the steel support, the micro-expansion concrete filling core 10 arranged in the pile head compensates shrinkage through micro-expansion characteristics to avoid cracks, the bottom end circular thin steel plate 16 limits concrete pouring, the number of anchor bars 15 is not less than 4, the lower end is connected with the circular thin steel plate, and the upper end is fixed with the anchor plate 6, so that the steel support load is transmitted to the pile body, the top surface of the anchor plate 6 is exposed to the pile head and is provided with an overflow hole 17, which is used for concrete pouring, air exhaust and monitoring, the longitudinal steel reinforcement cage main reinforcement one 11 and main reinforcement two 12 and the transverse stirrup one 13 and stirrup two 14 are bound to form a steel mesh cage, so that the integrity of the pile head is enhanced, the steel support 8 is welded with the channel steel 7 on the anchor plate through the fillet weld 9 to form a limiting structure, horizontal and vertical loads are transmitted, the prefabricated pipe pile column is embedded in the rock-soil body below the foundation pit bottom 2, the waterproof steel plate 3 between the prefabricated pipe pile column and the basement bottom plate 4 prevents underground water leakage, and the cooperation of various components enables the node to have good bearing, crack resistance and waterproof performance.

[0023] The embodiment also provides a construction method of the prefabricated pipe pile column steel support node, which comprises the following steps: S1, hoisting the prefabricated pipe pile column 1 to a designed position and sinking the pile to the bottom of the steel support 8; S2, cleaning the pile head 5, installing the longitudinal steel reinforcement cage composed of the main reinforcement one 11 and the main reinforcement two 12 and the transverse stirrup composed of the stirrup one 13 and the stirrup two 14, and connecting the anchor bar 15 with the circular thin steel plate 16 and the longitudinal steel reinforcement cage; S3, pouring the micro-expansion concrete in the pile head 5, discharging air and monitoring the pouring state through the overflow hole 17 on the anchor plate 6 during the pouring process, vibrating the concrete to form the micro-expansion concrete filling core 10; S4, fixedly connecting the anchor plate 6 with the top end of the longitudinal steel reinforcement cage, and erecting the steel support 8 on the anchor plate 6 to form the limiting structure through the welding of the channel steel 7.

[0024] Specifically, S1 hoists the prefabricated pipe pile column to a designed position and sinks the pile to the bottom of the steel support 8 to provide stable foundation support for the whole node; S2, after cleaning the pile head, installs the longitudinal steel reinforcement cage and the transverse stirrup, connects the anchor bar with the circular thin steel plate and the longitudinal steel reinforcement cage, and forms the steel reinforcement cage system of the pile head, thereby laying a foundation for subsequent concrete pouring and load transmission; S3 pours the micro-expansion concrete in the pile head, discharges air through the overflow hole and monitors the state, vibrates to form the filling core, and enhances the integrity and bearing capacity of the pile head; S4, fixedly connects the anchor plate with the top end of the longitudinal steel reinforcement cage, erects the steel support and welds the channel steel to form the limiting structure, reliably connects the steel support with the prefabricated pipe pile column, and ensures that the node can effectively transmit horizontal and vertical loads.

[0025] In step S1, the prefabricated pipe pile column 1 is sunk in a static pressure mode, and the verticality deviation of the pile body is controlled to be not more than 0.5% during the sinking process.

[0026] Specifically, the verticality of the pile body is adjusted in real time by using monitoring equipment such as the theodolite during the pile sinking process, so as to ensure that the deviation is controlled within 0.5%, thereby ensuring that the prefabricated pipe pile vertical column is vertically inserted into the soil, providing a flat and stable foundation for subsequent pile head treatment and steel support installation, avoiding uneven stress on the nodes due to the inclination of the pile body, and affecting the stability and safety of the overall structure.

[0027] In step S2, the concrete pouring height scale line is marked on the steel reinforcement cage.

[0028] Specifically, after the longitudinal steel reinforcement cage composed of main reinforcement one and main reinforcement two and the transverse stirrup composed of stirrup one and stirrup two are installed, the concrete pouring height scale line is marked on the main reinforcement of the steel reinforcement cage by using paint or a marker pen. The interval of the scale line is determined according to the layer pouring process, so as to ensure that the pouring thickness of each layer of concrete meets the design requirements. By marking the scale line, the construction personnel can intuitively control the pouring height of the micro-expansive concrete core, avoid over-pouring or under-pouring, ensure the accuracy of the top elevation of the core, and match the installation height of the anchor plate, so as to ensure the flatness and stress uniformity when the steel support is erected, and improve the node construction quality.

[0029] In step S3, the micro-expansive concrete core 10 is poured by using the layer pouring and layer vibrating process, and the pouring interval between layers is not more than 2 / 3 of the initial setting time of the concrete.

[0030] The layer pouring and layer vibrating process includes: The first layer is poured to 300mm above the round thin steel plate 16, and a diameter of 50mm vibrating rod is inserted for vibration; The second layer is poured to 1 / 2 of the height of the pile head 5, and a diameter of 30mm vibrating rod is used for supplementary vibration in the steel dense area; After the third layer is poured to the design elevation, the concrete is fully vibrated by using a flat vibrator for 1-2 minutes 2-3 hours before the initial setting of the concrete, and a diameter of 25mm vibrating rod is used for intensive vibration in the anchor plate periphery and the steel dense area.

[0031] Specifically, the micro-expansion concrete core 10 is poured by using a layered pouring and layered vibrating process. The first layer is poured to 300 mm above the round thin steel plate 16, a 50 mm diameter vibrating rod is inserted for vibration to ensure that the concrete fills the bottom space and is tightly combined with the round thin steel plate. The second layer is poured to 1 / 2 of the pile head 5 height, a 30 mm diameter vibrating rod is used to supplement vibration in the steel bar dense area to ensure that the concrete around the steel bar is dense. The third layer is poured to the design elevation, and 2-3 hours before the concrete initial setting, a flat vibrator is used for overall vibration for 1-2 minutes, and then a 25 mm diameter vibrating rod is used for intensive vibration around the anchor plate and steel bar dense area to eliminate surface cracks and improve flatness. The interval between layers is not more than 2 / 3 of the initial setting time of the concrete to ensure that the concrete of each layer is tightly combined to form an overall load-bearing structure. Through this process, the micro-expansion concrete core 10 cooperates with the pile head 5, anchor bar 15 and anchor plate 6 to effectively transfer the load and enhance the overall integrity and durability of the node.

[0032] In step S3, end-hook type steel fibers are mixed in the micro-expansion concrete, and the mixing amount is 1%-1.5% of the volume of the concrete, and the concrete slump is controlled at 160-180 mm.

[0033] Specifically, end-hook type steel fibers are mixed in the micro-expansion concrete, and the mixing amount is controlled at 1%-1.5% of the volume of the concrete, and the concrete slump is controlled at 160-180 mm to ensure good fluidity and filling property. The addition of steel fibers can significantly improve the crack resistance and toughness of the concrete, and inhibit the development of micro-cracks, and the appropriate slump ensures that the concrete can fully fill the gap between the pile head steel bars and the surrounding area of the anchor plate during layered pouring, avoiding the problems of holes or insufficient vibration caused by insufficient fluidity. The combination of the two makes the micro-expansion concrete core 10 form a high-strength and high-anti-crack composite structure after hardening, effectively improving the bearing capacity and durability of the pile head node, and ensuring that the load of the steel support is evenly transmitted to the prefabricated pipe pile column through the anchor plate.

[0034] In step S4, when the anchor plate 6 and the steel support 8 are installed, a symmetrical welding method is used to control the welding deformation.

[0035] Specifically, when the anchor plate 6 and the steel support 8 are installed, a symmetrical welding method is used, that is, synchronous welding operations are performed along the symmetrical positions on both sides of the steel support 8, the two end welds on the same side are welded first, and then the corresponding position welds on the other side are welded, and each weld uses a segmented back-off method, and the length of each segment is controlled at 200-300 mm. By using symmetrical welding and segmented back-off, the thermal stress generated during welding can be balanced, the deformation of the anchor plate 6 and the steel support 8 caused by uneven local heating can be effectively controlled, the axial deviation of the steel support 8 is not more than 5 mm, and the top surface elevation deviation is not more than ±3 mm, so that the steel support 8 and the anchor plate 6 form a stable rigid connection, the node stress is uniform, and the stability and safety of the overall structure are improved.

[0036] In step S4, after the channel steel 7 is welded with the steel support 8 and the anchor plate 6, ultrasonic flaw detection is performed on the weld.

[0037] Specifically, after the channel steel 7 is welded with the steel support 8 and the anchor plate 6, ultrasonic flaw detection is performed on the weld. During the detection, the internal signals of the weld are analyzed by professional equipment to determine whether there are defects, so as to ensure that the welding quality meets the requirements, eliminate hidden dangers in time, ensure that the channel steel is reliably connected with the steel support and the anchor plate, make the limiting structure effectively transfer the load, and enhance the structural safety and durability of the joint.

[0038] In step S3, during the pouring of the micro-expansive concrete, the overflow hole 17 on the anchor plate 6 is used to discharge air and monitor the pouring height.

[0039] Specifically, during the pouring of the micro-expansive concrete, the overflow hole 17 on the anchor plate 6 is used to discharge air in the pile head 5 to avoid the formation of air bubbles and cavities in the concrete. At the same time, by observing whether the concrete overflows from the overflow hole, it can be directly determined whether the pouring height reaches the design elevation, so as to ensure that the micro-expansive concrete core 10 is fully poured and tightly combined with the bottom surface of the anchor plate 6, and the integrity and load transfer efficiency of the joint are ensured.

[0040] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A prefabricated pipe pile column steel support node, characterized in that: include: A prefabricated pipe pile column (1), wherein a pile head (5) is provided on the top of the prefabricated pipe pile column (1), a micro-expansion concrete core (10) is provided in the prefabricated pipe pile column (1), the bottom end of the micro-expansion concrete core (10) is fixedly connected to a circular thin steel plate (16) via an anchor bar (15), the top end of the anchor bar (15) is fixedly connected to an anchor plate (6), an overflow hole (17) is provided on the anchor plate (6), the pile head (5) is exposed on the top surface of the anchor plate (6), and the number of the anchor bars (15) is not less than 4; A longitudinal steel frame and transverse stirrups are provided in the pile head (5), wherein the longitudinal steel frame comprises a main reinforcement 1 (11) and a main reinforcement 2 (12), and the transverse stirrups comprise a stirrup 1 (13) and a stirrup 2 (14), and the longitudinal steel frame and the transverse stirrups are connected by binding; A steel support (8), the steel support (8) being arranged on the anchor plate (6), and the side surface of the steel support (8) being connected to the channel steel (7) by welding to form a fillet weld (9); The lower end of the prefabricated pipe pile column (1) is embedded in the rock and soil below the bottom of the foundation pit, and a water-stop steel plate (3) is provided between the prefabricated pipe pile column (1) and the basement floor (4).

2. A construction method for a prefabricated pipe pile column steel support node, used for a prefabricated pipe pile column steel support node according to claim 1, characterized in that: The following steps are involved: S1. Hoist the prefabricated pipe pile column (1) to the designed position and sink the pile to the bottom of the steel support (8); S2, clean the pile head (5), install the longitudinal reinforcement skeleton consisting of main reinforcement 1 (11) and main reinforcement 2 (12) and the transverse stirrups consisting of stirrup 1 (13) and stirrup 2 (14), and connect the anchor bar (15) with the round thin steel plate (16) and the longitudinal reinforcement skeleton; S3, pouring micro-expansion concrete in the pile head (5), exhausting air through the overflow hole (17) on the anchor plate (6) during the pouring process, monitoring the pouring status, and vibrating the concrete to form a micro-expansion concrete core (10); S4. The anchor plate (6) is fixedly connected to the top of the longitudinal steel bar skeleton, the steel support (8) is erected on the anchor plate (6), and a limiting structure is formed by welding the channel steel (7).

3. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In the step S1, the prefabricated pipe pile column (1) is sunk by static pressure, and the verticality deviation of the pile body is controlled to be no more than 0.5% during the sinking process.

4. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S2, a scale line indicating the concrete pouring height is marked on the steel frame.

5. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S3, the micro-expansive concrete core filling (10) is poured using a layered pouring and layered vibration process, with the interval between layers not exceeding 2 / 3 of the initial setting time of the concrete.

6. The construction method of a prefabricated pipe pile column steel support node according to claim 5, characterized in that: The layered pouring and layered vibration process includes: The first layer is poured to 300 mm above the circular thin steel plate (16), and a 50 mm diameter vibrating rod is inserted and vibrated; The second layer is poured to 1 / 2 of the height of the pile head (5), and a 30mm diameter vibrator is used to supplement the vibration of the densely reinforced area; After the third layer is poured to the designed elevation, use a flat vibrator to fully vibrate for 1-2 minutes 2-3 hours before the initial setting of the concrete, and then use a 25mm diameter vibrating rod to intensify the vibration around the anchor plate and the area with dense steel bars.

7. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S3, end hook-shaped steel fibers are added to the slightly expansive concrete in an amount of 1%-1.5% of the concrete volume, and the slump of the concrete is controlled at 160-180 mm.

8. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S4, when the anchor plate (6) and the steel support (8) are installed, a symmetrical welding method is used to control welding deformation.

9. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S4, after the channel steel (7) is welded to the steel support (8) and the anchor plate (6), the weld is subjected to ultrasonic flaw detection.

10. The construction method of a prefabricated pipe pile column steel support node according to claim 2, characterized in that: In step S3, during the pouring of the micro-expansive concrete, air is discharged through the overflow hole (17) on the anchor plate (6) and the pouring height is monitored.

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