High-strength bending-resistant prestressed concrete steel pipe pile based on deep foundation pit support

Abstract

The invention is suitable for the technical field of deep foundation pit supporting, and provides a high-strength bending-resistant prestressed concrete steel pipe pile based on deep foundation pit supporting. The limiting frame is fixedly arranged in the steel pipe body, a concrete layer is arranged in the limiting frame, and a reinforcement cage is arranged in the concrete layer. According to the high-strength anti-bending prestressed concrete steel pipe pile for deep foundation pit supporting, the second support of one steel pipe body can be in butt joint with the first support of the other steel pipe body through the splicing assembly, and therefore displacement of the two steel pipe bodies in the butt joint process is avoided; the through holes of the two steel pipe main bodies are connected through bolts, the butt joint effect of the two steel pipe main bodies can be achieved, the positions of the two steel pipe main bodies can be limited in the mode, the steel pipe main bodies are prevented from deviating in the splicing process, and the butt joint effect of the two steel pipe main bodies is improved. And convenience is provided for splicing work.

Description

Technical Field

[0001] This invention belongs to the field of deep foundation pit support technology, and particularly relates to high-strength bending-resistant prestressed concrete steel pipe piles for deep foundation pit support. Background Technology

[0002] Deep foundation pit support is an engineering technique that involves supporting, reinforcing, and protecting the sidewalls of a foundation pit to ensure the safety of underground structure construction and the surrounding environment. Its core objective is to prevent accidents such as collapse and water seepage, and to reduce the impact on adjacent buildings and underground facilities. The support scheme must be selected in combination with geological conditions, water level control, and other factors.

[0003] A search revealed existing technology (publication number: CN223562135U) for a spiral steel pipe pile used in offshore photovoltaic power stations. The text describes a structure comprising: "a reduced-diameter section, a transition section, and a reinforcing section; the reduced-diameter section is a quasi-cylindrical or equal-cylindrical shape with a gradually decreasing radius, set in the seabed; the transition section is a conical cylinder, gradually widening from the end connecting to the reduced-diameter section to the end connecting to the reinforcing section; the reinforcing section is cylindrical; the reduced-diameter section is equipped with a first spiral blade; the surfaces of the reduced-diameter section and the first spiral blade are coated with a protective coating." "Corrosion-resistant coating." However, the existing prestressing technology is poor, lacking bending and shear resistance. Furthermore, in deep foundation pit support, due to the excessive depth of the pit, the length of a single steel pipe pile is insufficient, usually requiring splicing to increase its length. However, during splicing, because the outer contour of the steel pipe pile is cylindrical, it is prone to rolling and shifting, requiring multiple people to work together, making the operation inconvenient and inefficient. Therefore, it is essential to design high-strength, bending-resistant prestressed concrete steel pipe piles for deep foundation pit support. Summary of the Invention

[0004] This invention provides high-strength, flexurally resistant prestressed concrete steel pipe piles for deep foundation pit support, aiming to solve the problem that in the existing technology, due to the cylindrical outer contour, the steel pipe piles are prone to rolling and shifting during splicing, which requires multiple people to cooperate and is not convenient and efficient.

[0005] This invention is implemented as follows: based on high-strength, flexurally resistant prestressed concrete steel pipe piles for deep foundation pit support, it includes a steel pipe body; a limiting frame fixedly installed inside the steel pipe body, the limiting frame having a concrete layer inside, the concrete layer having a reinforcing cage inside, a first support fixedly installed at one end of the steel pipe body, and a second support fixedly installed at the other end of the steel pipe body. Both the first and second supports are provided with splicing components for docking. Both the first and second supports have several fixing grooves equidistantly opened, and through holes are opened in the fixing grooves. Support components for increasing stress are provided in the through holes.

[0006] Preferably, the splicing assembly includes a movable groove, a movable block, a connecting ball, a magnet, a connecting groove, a clamp, a support plate, and a spring; four movable grooves are symmetrically opened on the second support, and a movable block is connected to the movable groove through a shaft. A connecting ball is fixedly connected to the movable block. A magnet is fixedly installed inside the movable groove. Four connecting grooves are symmetrically opened at the bottom of the first support. A pair of clamps are connected to the inside of the connecting groove through a shaft. A support plate is fixedly connected to the outer wall of the clamp. A spring is fixedly connected to the support plate, and the other end of the spring is fixedly connected to the inner wall of the connecting groove.

[0007] Preferably, the movable block is made of ferritic stainless steel and can be magnetically connected to a magnet, and the movable block is in the shape of a right trapezoid.

[0008] Preferably, the support assembly includes a movable plate, a screw, a limiting plate, a support block, an insert rod, and a slot; the movable plate is hinged to the fixed slot, the screw is inserted into the movable plate, the limiting plate is fixedly connected to the screw, and the limiting plate is designed to fit snugly with the movable plate, the support block is sleeved on the limiting plate, the insert rods are fixedly connected to the limiting plates around the second support, and slots are provided on the limiting plates around the first support.

[0009] Preferably, the support assembly further includes a support plate fixedly mounted on the screw, and a nut is detachably mounted on the screw. The support plate and the nut are respectively designed to fit against both ends of the support block.

[0010] Preferably, the insert and the slot are the same size and shape, and both the screw and the slot are made of threaded steel.

[0011] Preferably, the reinforcing cage is composed of several reinforcing bars and several reinforcing rings. The reinforcing bars are arranged in a circular array, and the reinforcing rings are distributed at equal intervals within the reinforcing cage. The reinforcing rings are welded and fixed to the reinforcing bars. The outer periphery of the reinforcing cage is provided with spiral reinforcing bars, which are welded and fixed to the reinforcing bars.

[0012] Preferably, the reinforcing bar has several arc-shaped reinforcing bars, and several first reinforcing bars are welded between two adjacent arc-shaped reinforcing bars.

[0013] Preferably, a plurality of prestressed portions are fixedly disposed on the main body of the steel pipe, and a plurality of second reinforcing ribs are fixedly connected between each two adjacent prestressed portions, and the second reinforcing ribs are welded and fixed to the main body of the steel pipe.

[0014] Preferably, the thickness of the steel pipe body is 10~12mm, and the outer surface of the steel pipe body is coated with an epoxy asphalt anti-corrosion coating.

[0015] Compared with related technologies, the high-strength, flexurally-resistant prestressed concrete steel pipe piles for deep foundation pit support provided by this invention have the following beneficial effects:

[0016] 1. When two steel pipe bodies are joined, splicing components can be used to connect the second support of one steel pipe body to the first support of the other, thus preventing displacement of the two steel pipe bodies during the joining process. This would avoid misalignment of the through holes of the two steel pipe bodies and affect the joining work. By using bolts to connect the through holes of the two steel pipe bodies, the joining effect of the two steel pipe bodies can be achieved. This method can restrict the position of the two steel pipe bodies, prevent the steel pipe bodies from shifting during the splicing process, and provide convenience for the splicing work. At the same time, it can reduce the number of splicing workers and reduce the waste of labor resources. The concrete layer and steel cage can increase the strength of the steel pipe body, improve the overall bending resistance and prestress, thereby improving the support effect of deep foundation pit. The support components can increase the stress transfer effect between the two steel pipe bodies. The limiting frame is used to restrict the position of the concrete layer and steel cage, which is conducive to improving the connection line with the steel pipe body and increasing the strength of the steel pipe body.

[0017] 2. By flipping the movable plate, when the two steel pipe bodies are joined together, the insert rod can be inserted into the slot of the other steel pipe body to achieve the connection effect of the two screw rods. The stress on the screw rod can be transferred to the steel pipe body through the support block. The position of the support block on the screw rod can be fixed by the nut and the support plate.

[0018] 3. The main structure of the steel cage is formed by steel bars and steel rings. Spiral steel bars can improve the vertical strength of the steel cage, while curved steel bars and first reinforcing bars can improve the horizontal strength. The prestressed part and second reinforcing bars can improve the overall strength of the steel pipe body. By spraying an epoxy asphalt anti-corrosion coating, it can be used for wharf and bridge bearing columns, with strong durability. This prestressed concrete steel pipe pile has good bending and shear resistance, and is safer and more reliable when used as a deep foundation pit support pile. Its high strength can replace channel steel and be used as a factory building support column or load-bearing beam. Attached Figure Description

[0019] Figure 1 This is an overall isometric view of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the bottom structure of the present invention;

[0022] Figure 4 This is an overall sectional view of the present invention;

[0023] Figure 5 This is a cross-sectional view of the movable groove of the present invention;

[0024] Figure 6 This is a cross-sectional view of the connecting groove of the present invention;

[0025] Figure 7 This is an overall top view of the present invention;

[0026] Figure 8 This is an isometric view of the reinforcing cage of the present invention;

[0027] Figure 9 This is a schematic diagram of the steel cage structure of the present invention.

[0028] In the diagram: 1. Steel pipe body; 2. Limiting frame; 3. Concrete layer; 4. Reinforcing cage; 41. Reinforcing bar; 42. Reinforcing ring; 43. Spiral reinforcement; 44. Curved reinforcement; 45. First reinforcing rib; 5. First support; 6. Second support; 7. Splicing assembly; 71. Movable groove; 72. Movable block; 73. Connecting ball; 74. Magnet; 75. Connecting groove; 76. Clamp; 77. Support plate; 78. Spring; 8. Fixing groove; 9. Through hole; 10. Support assembly; 101. Movable plate; 102. Screw; 103. Limiting plate; 104. Support block; 105. Insert rod; 106. Slot; 107. Support plate; 108. Nut; 11. Prestressed part; 12. Second reinforcing rib. Detailed Implementation

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] Example 1

[0032] The preferred embodiment of the high-strength, flexurally resistant prestressed concrete steel pipe piles for deep foundation pit support provided by this invention is as follows: Figures 1 to 9 As shown: a high-strength, flexurally resistant prestressed concrete steel pipe pile for deep foundation pit support includes a steel pipe body 1; a limiting frame 2 fixedly installed inside the steel pipe body 1, a concrete layer 3 inside the limiting frame 2, a reinforcing cage 4 inside the concrete layer 3, a first support 5 fixedly installed at one end of the steel pipe body 1, and a second support 6 fixedly installed at the other end of the steel pipe body 1. Both the first support 5 and the second support 6 are provided with splicing components 7 for docking. Several fixing grooves 8 are equally spaced on both the first support 5 and the second support 6, and through holes 9 are provided on the fixing grooves 8. Support components 10 for increasing stress are provided on the through holes 9.

[0033] In this embodiment, when two steel pipe bodies 1 are joined, the splicing component 7 can be used to connect the second support 6 of one steel pipe body 1 with the first support 5 of the other steel pipe body 1, thereby preventing displacement of the two steel pipe bodies 1 during the joining process, which would cause the through holes 9 of the two steel pipe bodies 1 to shift and affect the joining work. By using bolts to connect the two steel pipe bodies 1 at the through holes 9, the joining effect of the two steel pipe bodies 1 can be achieved. The concrete layer 3 and the reinforcing cage 4 can increase the strength of the steel pipe body 1, improve the overall bending resistance and prestress, thereby improving the deep foundation pit support effect. The support component 10 can increase the stress transfer effect between the two steel pipe bodies 1. The limiting frame 2 is used to limit the position of the concrete layer 3 and the reinforcing cage 4, which is conducive to raising the connection line with the steel pipe body 1 and increasing the strength of the steel pipe body 1.

[0034] In a further preferred embodiment of the present invention, the splicing component 7 includes a movable groove 71, a movable block 72, a connecting ball 73, a magnet 74, a connecting groove 75, a clamp 76, a support plate 77, and a spring 78; four movable grooves 71 are symmetrically opened on the second support 6, and a movable block 72 is connected to the movable groove 71 by a shaft. A connecting ball 73 is fixedly connected to the movable block 72. A magnet 74 is fixedly installed inside the movable groove 71. Four connecting grooves 75 are symmetrically opened at the bottom of the first support 5. A pair of clamps 76 are connected to the inside of the connecting groove 75 by a shaft. A support plate 77 is fixedly connected to the outer wall of the clamp 76. A spring 78 is fixedly connected to the support plate 77, and the other end of the spring 78 is fixedly connected to the inner wall of the connecting groove 75.

[0035] In this embodiment, by rotating the movable block 72 to make it stand upright, the movable block 72 can be magnetically fixed by the magnet 74 to prevent it from tipping over during the docking process. When the second support 6 of the steel pipe body 1 is in contact with the first support 5 of the other steel pipe body 1, under the action of the squeezing force, the connecting ball 73 will push the two clamps 76 to the sides and move between the two clamps 76. When the clamps 76 move outward, the support plate 77 will simultaneously squeeze the spring 78. When the connecting ball 73 moves into the space between the two clamps 76, the spring 78 will release the tension and push the support plate 77 to reset, thus restricting the connecting ball 73 within the two clamps 76, thereby achieving the initial positioning of the two steel pipe bodies 1 and facilitating the docking work of the steel pipe bodies 1.

[0036] In a further preferred embodiment of the present invention, the movable block 72 is made of ferritic stainless steel and can be magnetically connected to the magnet 74. The movable block 72 is in the shape of a right trapezoid.

[0037] In this embodiment, the right-angled trapezoid shape can provide good support for the movable block 72, and the position of the movable block 72 can be restricted by the magnet 74.

[0038] In a further preferred embodiment of the present invention, the support assembly 10 includes a movable plate 101, a screw 102, a limiting plate 103, a support block 104, an insert rod 105, and a slot 106; the movable plate 101 is hinged to the fixed groove 8, the screw 102 is inserted into the movable plate 101, the limiting plate 103 is fixedly connected to the screw 102, and the limiting plate 103 is designed to fit snugly with the movable plate 101, the support block 104 is sleeved on the limiting plate 103, the insert rod 105 is fixedly connected to the limiting plates 103 around the second support 6, and the slot 106 is opened on the limiting plates 103 around the first support 5.

[0039] In this embodiment, by flipping the movable plate 101, when the two steel pipe bodies 1 are connected, the insertion rod 105 can be inserted into the slot 106 of the other steel pipe body 1 to achieve the connection effect of the two screws 102. The stress on the screw 102 can be transferred to the steel pipe body 1 through the support block 104.

[0040] In a further preferred embodiment of the present invention, the support assembly 10 further includes a support plate 107 fixedly disposed on the screw 102, and a nut 108 detachably disposed on the screw 102. The support plate 107 and the nut 108 are respectively designed to fit against both ends of the support block 104.

[0041] In this embodiment, the position of the support block 104 on the screw 102 can be fixed by using the nut 108 and the support plate 107.

[0042] In a further preferred embodiment of the present invention, the insert 105 and the slot 106 are the same in size and shape, and the screw 102 and the slot 106 are both made of threaded steel.

[0043] In this embodiment, the insertion rod 105 and the slot 106 are the same size and shape, which can improve the connection effect when they are connected, and the threaded steel can increase the strength of the screw 102.

[0044] Example 2

[0045] Based on Example 1, the preferred embodiment of the present invention based on high-strength flexural prestressed concrete steel pipe piles for deep foundation pit support is as follows: Figures 1 to 9 As shown: The reinforcing cage 4 is composed of several reinforcing bars 41 and several reinforcing rings 42. The reinforcing bars 41 are arranged in a circular array. The reinforcing rings 42 are distributed at equal intervals inside the reinforcing cage 4 and are welded and fixed to the reinforcing bars 41. The outer periphery of the reinforcing cage 4 is provided with spiral reinforcing bars 43, which are welded and fixed to the reinforcing bars 41.

[0046] In this embodiment, the main structure of the steel cage 4 is formed by the steel bar rod 41 and the steel bar ring 42, and the spiral steel bar 43 can improve the strength of the steel cage 4 in the vertical direction.

[0047] In a further preferred embodiment of the present invention, a plurality of arc-shaped steel bars 44 are provided on the steel bar 41, and a plurality of first reinforcing bars 45 are welded between two adjacent arc-shaped steel bars 44.

[0048] In this embodiment, the horizontal strength of the steel cage 4 can be improved by using the curved steel bar 44 and the first reinforcing bar 45.

[0049] In a further preferred embodiment of the present invention, a plurality of prestressed portions 11 are fixedly disposed on the steel pipe body 1, and a plurality of second reinforcing ribs 12 are fixedly connected between two adjacent prestressed portions 11, and the second reinforcing ribs 12 are welded and fixed to the steel pipe body 1.

[0050] In this embodiment, the prestressed part 11 and the second reinforcing rib 12 can be used to improve the overall strength of the steel pipe body 1.

[0051] In a further preferred embodiment of the present invention, the thickness of the steel pipe body 1 is 10~12mm, and the outer surface of the steel pipe body 1 is coated with an epoxy asphalt anti-corrosion coating.

[0052] In this embodiment, the epoxy asphalt anti-corrosion coating is applicable to the load-bearing columns of docks and bridge supports, and has strong durability.

[0053] In use, the two steel pipe bodies 1 are arranged vertically or horizontally. By rotating the movable block 72, it is brought into an upright position. The movable block 72 can be magnetically fixed in its upright state using the magnet 74, preventing it from tipping over during the docking process. When the second support 6 of the steel pipe body 1 is in contact with the first support 5 of the other steel pipe body 1, under the action of the compressive force, the connecting ball 73 will push the two clamps 76 apart to the sides and move between the two clamps 76. When the clamps 76 move outward, the support plate 77 will simultaneously compress the spring 78. When the connecting ball 73 moves between the two clamps 76, the spring... Spring 78 releases tension and pushes support plate 77 to reset, which can confine connecting ball 73 within two clamps 76, thereby achieving initial positioning of the two steel pipe bodies 1 and preventing displacement of the two steel pipe bodies 1 during the docking process, which would cause the through holes 9 of the two steel pipe bodies 1 to shift. This facilitates the docking of the steel pipe bodies 1. By using bolts to connect the two steel pipe bodies 1 at the through holes 9, the docking effect of the two steel pipe bodies 1 can be achieved. After docking, by flipping the movable plate 101, when the two steel pipe bodies 1 are docked, the insertion rod 105 can be inserted into the slot 106 of the other steel pipe body 1. To achieve the connection between the two screws 102, the support block 104 can transfer the stress on the screws 102 to the steel pipe body 1, thereby increasing the stress transfer effect between the two steel pipe bodies 1. When one of the steel pipe bodies 1 is subjected to external forces, the force can be better dispersed. The concrete layer 3 and the reinforcing cage 4 can increase the strength of the steel pipe body 1, improve the overall bending resistance and prestress, thereby improving the deep foundation pit support effect. The limiting frame 2 is used to limit the position of the concrete layer 3 and the reinforcing cage 4, which is conducive to raising the connection line with the steel pipe body 1 and increasing the strength of the steel pipe body 1. 1 and 42 are used to form the main structure of the steel cage 4. The spiral steel bar 43 can improve the vertical strength of the steel cage 4. The arc steel bar 44 and the first reinforcing bar 45 can improve the horizontal strength of the steel cage 4. The prestressed part 11 and the second reinforcing bar 12 can improve the overall strength of the steel pipe body 1. By spraying an epoxy asphalt anti-corrosion coating, it can be used for wharf and bridge bearing columns. It has strong durability. This prestressed concrete steel pipe pile has good bending and shear resistance. It is safer and more reliable when used as a deep foundation pit support pile. Its high strength can replace channel steel and be used as a factory building support column or load-bearing beam.

[0054] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A high-strength, flexurally resisting prestressed concrete steel pipe pile for deep foundation pit support, characterized in that, include: Steel pipe body (1); A limiting frame (2) is fixedly installed inside the steel pipe body (1). A concrete layer (3) is provided inside the limiting frame (2). A steel cage (4) is provided inside the concrete layer (3). A first support (5) is fixedly installed at one end of the steel pipe body (1). A second support (6) is fixedly installed at the other end of the steel pipe body (1). A splicing component (7) for docking is provided on both the first support (5) and the second support (6). Several fixing grooves (8) are equally spaced on both the first support (5) and the second support (6). A through hole (9) is provided on the fixing groove (8). A support component (10) for increasing stress is provided on the through hole (9).

2. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 1, characterized in that, The splicing component (7) includes a movable groove (71), a movable block (72), a connecting ball (73), a magnet (74), a connecting groove (75), a clamp (76), a support plate (77), and a spring (78). Four movable slots (71) are symmetrically opened on the second support (6), and movable blocks (72) are connected to the movable slots (71) by a shaft. A connecting ball (73) is fixedly connected to the movable block (72). A magnet (74) is fixedly installed inside the movable slot (71). Four connecting slots (75) are symmetrically opened at the bottom of the first support (5). A pair of clamps (76) are connected to the inside of the connecting slots (75) by a shaft. A support plate (77) is fixedly connected to the outer wall of the clamps (76). A spring (78) is fixedly connected to the support plate (77), and the other end of the spring (78) is fixedly connected to the inner wall of the connecting slot (75).

3. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 2, characterized in that, The movable block (72) is made of ferritic stainless steel and can be magnetically connected to the magnet (74). The movable block (72) is in the shape of a right trapezoid.

4. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 1, characterized in that, The support assembly (10) includes a movable plate (101), a screw (102), a limiting plate (103), a support block (104), a plug rod (105), and a slot (106). A movable plate (101) is hinged to the fixed groove (8). A screw (102) is inserted into the movable plate (101). A limiting plate (103) is fixedly connected to the screw (102). The limiting plate (103) is designed to fit the movable plate (101). A support block (104) is sleeved on the limiting plate (103). Insert rods (105) are fixedly connected to the limiting plates (103) around the second support (6). Slots (106) are opened on the limiting plates (103) around the first support (5).

5. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 4, characterized in that, The support assembly (10) also includes a support plate (107) fixedly mounted on the screw (102), and a nut (108) is detachably mounted on the screw (102). The support plate (107) and the nut (108) are respectively designed to fit against both ends of the support block (104).

6. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 4, characterized in that, The insert (105) and slot (106) are the same size and shape, and both the screw (102) and slot (106) are made of threaded steel.

7. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 1, characterized in that, The steel cage (4) is composed of several steel rods (41) and several steel rings (42). The steel rods (41) are arranged in a circular array. The steel rings (42) are distributed at equal intervals inside the steel cage (4). The steel rings (42) are welded and fixed to the steel rods (41). The outer periphery of the steel cage (4) is provided with spiral steel bars (43), and the spiral steel bars (43) are welded and fixed to the steel rods (41).

8. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 7, characterized in that, The steel bar (41) is provided with a number of arc-shaped steel bars (44), and a number of first reinforcing bars (45) are welded between two adjacent arc-shaped steel bars (44).

9. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 1, characterized in that, Several prestressed parts (11) are fixedly installed on the main body of the steel pipe (1), and several second reinforcing ribs (12) are fixedly connected between two adjacent prestressed parts (11). The second reinforcing ribs (12) are welded and fixed to the main body of the steel pipe (1).

10. The high-strength, flexurally-resistant prestressed concrete steel pipe pile for deep foundation pit support as described in claim 1, characterized in that, The thickness of the steel pipe body (1) is 10~12mm, and the outer surface of the steel pipe body (1) is coated with an epoxy asphalt anti-corrosion coating.

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