A corrosion-resistant prestressed concrete pipe pile

Abstract

The present invention relates to the field of engineering construction technology, in particular to a corrosion-resistant prestressed concrete pipe pile, comprising a prestressed steel frame, a concrete pile body, an end plate A, an end plate B, a bearing assembly and a pile head assembly. The interior of the concrete pile body is wrapped with a prestressed steel frame, and one end of the prestressed steel frame is clamped with an end plate A. The present invention provides a corrosion-resistant prestressed concrete pipe pile. When the pile head enters a hard soil layer and hammers the top of the pipe pile, the upper end surface of the hammer head is first subjected to an impact force, thereby causing a pressure rod and the pile head to bear the impact force and advance downward. When the upper end surface of the hammer head is lower than the upper end surface of the end plate A, the pipe pile bears the impact force and moves downward. In this way, after the pile head advances, the pile body moves downward again, which can reduce the resistance of the pile body when moving downward, and the pile head and the pressure rod can share the impact load borne by the pile body during piling, thereby reducing the loss of the pile body, and keeping the pile body concrete intact, thereby improving the corrosion resistance of the pipe pile.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction, in particular to a corrosion-resistant prestressed concrete pipe pile. Background Art

[0002] Since the 21st century, my country's population has been growing, but the available land has been gradually reduced, and the height of new buildings has been getting higher and higher. Therefore, the bearing capacity and strength requirements of pipe piles are also increasing. Because prestressed concrete pipe piles are buried deep underground, the environment they are in is complex, especially in some places with abnormal pH. When the outer concrete of the prestressed concrete pipe piles is damaged, the steel bars inside the pipe piles are corroded, causing the bending moment of the prestressed concrete pipe piles to decrease and the bearing capacity to weaken, which poses a safety hazard to the building.

[0003] During the piling process, when the prestressed concrete pipe piles penetrate into the hard soil layer, due to the high soil density of the hard soil layer, the impact load on the outer wall of the pipe pile increases dramatically during the hammering process. If you are not careful, the concrete pile body of the prestressed concrete pipe pile will crack, which will reduce the corrosion resistance of the prestressed concrete pipe pile and even make the pipe pile scrapped. In addition, when prestressed concrete pipe piles are used as pile foundations in high-rise buildings, the prestressed concrete pipe piles mostly need to be butt-jointed during the pile construction process. At present, most of the butt joints are positioned by pin holes, and steel hoops are added at the connection of the two pipe piles for welding. After the welding is completed, the steel hoops are removed. After the steel hoops are removed, the two pipe piles are connected only by pins and welds. Once there is a slight deviation during hammering, cracks are very likely to appear at the weld. Cracks at the weld are very likely to cause cracks at the interface or broken piles in subsequent construction. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a corrosion-resistant prestressed concrete pipe pile.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a corrosion-resistant prestressed concrete pipe pile, comprising a prestressed steel frame, a concrete pile body, an end plate A, an end plate B, a bearing assembly and a pile head assembly, the interior of the concrete pile body is wrapped with a prestressed steel frame, one end of the prestressed steel frame is clamped with the end plate A, the other end of the prestressed steel frame is clamped with the end plate B, one end of the end plate B is welded with the pile head assembly, one end surface of the pile head assembly is welded with the bearing assembly, and the other end of the bearing assembly and the end plate A form a matching mechanism;

[0006] The pile head assembly comprises a pile head base welded to one end surface of the end plate B, one end surface of the pile head base is provided with a pile head mounting groove, and the pile head is slidably fitted in the pile head mounting groove;

[0007] The bearing assembly includes a pressure-bearing rod with one end welded to the center position of the back side of the pile head, and a positioning ring is fixedly installed on the other end of the pressure-bearing rod by bolts, a connecting support assembly is arranged above the positioning ring, and the connecting support assembly is sleeved on the outer wall of the pressure-bearing rod, a hammer head is inserted above the connecting support assembly, and the hammer head and one end of the pressure-bearing rod form a matching mechanism.

[0008] Furthermore, the pressure-bearing rod is a stepped shaft with a hollow structure, and the pressure-bearing rod is made of metal material. An L-shaped groove is provided on the inner wall of one end of the fixing positioning ring of the pressure-bearing rod, and the L-shaped groove and the hammer head are a matching mechanism. The pile head slides in the pile head mounting groove, and tends to move downward under the action of gravity when the pipe pile is lifted. After the hammer head is assembled to the L-shaped groove, it can prevent the pile head and the pressure-bearing rod from falling off during lifting.

[0009] Furthermore, a plurality of slots are provided on the inner wall of the end plate A, and the slots and the connecting support assembly form a matching mechanism.

[0010] Furthermore, the connecting support assembly includes a limit ring sleeved on the outer wall of the pressure-bearing rod, the limit ring is circumferentially provided with a plurality of threaded holes passing through both ends, a plurality of support rods are circumferentially fixedly welded on the outer wall of the limit ring, a limit block is fixedly welded on the other end of the support rod, and the limit block is slidably fitted in the groove opened by the end plate A, and the distance between the limit ring and the positioning ring is adjusted by applying bolts to the threaded holes set in the limit ring, thereby adjusting the position of the limit block in the groove.

[0011] Furthermore, the hammer head is a stepped shaft structure, the diameter of the first step is the same as the inner diameter of the pressure-bearing rod, the diameter of the second step is the same as the diameter of the steps at both ends of the pressure-bearing rod (51), the maximum diameter of the top is the same as the outer diameter of the limit ring, a protrusion is embedded on the outer wall of the bottom end of the first step of the hammer head, and the protrusion and the L-shaped slot are a matching mechanism. When the hammer head is matched in the pressure-bearing rod, the overall height of the hammer head and the pressure-bearing rod is greater than the distance between the mounting surface of the pile head in the pile head base and the upper end surface of the end plate A. When hammering the bottom pile, the protruding hammer head is first subjected to the impact load, causing the pile head to be forced downward, thereby reducing the intensity of the impact load on the outer wall of the pipe pile concrete.

[0012] Furthermore, the inner diameter of the end plate B is the same as the diameter of the circle where the inner wall of the groove opened in the end plate A is located. When connecting the pipe piles, the end plate B at the bottom of the top pipe pile is stuck on the outer wall of the limit block, and the impact load on the weld during piling is reduced by connecting the support assembly.

[0013] Furthermore, a circular hole is opened at the center position of the pile head base, and the diameter of the circular hole is larger than the outer diameter of the pressure-bearing rod. One end of the pressure-bearing rod passes through the pile head base and is welded to the center position of the back side of the pile head. During the subsequent lifting and transportation process, the circular hole opened in the pile head base plays a role in auxiliary support of the pressure-bearing rod.

[0014] Furthermore, an anti-corrosion coating is applied on the outer wall of the prestressed steel frame.

[0015] Beneficial effects of the present invention:

[0016] 1: A corrosion-resistant prestressed concrete pipe pile provided by the present invention, when hammering the bottom pipe pile, the connecting support assembly supports the pressure-bearing rod so that it will not tilt, when the pile head enters the hard soil layer and hammers the top of the pipe pile, the upper end surface of the hammer head is first subjected to the impact force, and then the pressure-bearing rod and the pile head are subjected to the impact force and advance downward, when the upper end surface of the hammer head is lower than the upper end surface of the end plate A, the pipe pile is subjected to the impact force and moves downward, in this way, after the pile head advances, the pile body moves downward again, which can reduce the resistance of the pile body when moving downward, and the pile head and the pressure-bearing rod can share the impact load borne by the pile body during piling, reduce the loss of the pile body, keep the pile body concrete intact, thereby improving the corrosion resistance of the pipe pile;

[0017] 2: A corrosion-resistant prestressed concrete pipe pile provided by the present invention, when the pipe piles are butt-jointed, the hammer head is removed, and the height of the connecting support assembly is adjusted by bolts so that the height of the limit block is higher than the upper end surface of the end plate A. After the butt-jointing is completed, the connecting support assembly supports the butt joint gap between the upper and lower pipe piles to make the connection more solid, and can effectively reduce the impact load on the weld in subsequent construction operations. At the same time, the limit ring in the connecting support assembly connects the pressure rods arranged in the upper and lower pipe piles, so that the pressure rods can be accurately butt-jointed, thereby transmitting the impact load on the upper pipe pile to the pipe pile head.

[0018] 3: The present invention provides a corrosion-resistant prestressed concrete pipe pile, in which the prestressed steel bars are coated with an anti-corrosion coating before the pipe pile is cast, so that the formed prestressed concrete pipe pile can still maintain good corrosion resistance after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 is an exploded view of the present invention;

[0021] Figure 2 It is the front view of the present invention;

[0022] Figure 3 The present invention Figure 2 Sectional view along AA;

[0023] Figure 4 The present invention Figure 3 Magnified view of area C in the middle;

[0024] Figure 5 It is a state diagram of the bottom pile interface when docking the present invention;

[0025] Figure 6 The present invention Figure 5 Magnified view of area D in the middle;

[0026] Figure 7 It is an exploded view of the pile head assembly of the present invention.

[0027] In the figure: 1. Prestressed steel frame; 2. Concrete pile body; 3. End plate A; 4. End plate B; 5. Bearing assembly; 6. Pile head assembly; 51. Pressure rod; 52. Positioning ring; 53. Connecting support assembly; 54. Hammer head; 61. Pile head; 62. Pile head base; 531. Limiting ring; 532. Support rod; 533. Limiting block. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] like Figure 1-Figure 7 As shown, a corrosion-resistant prestressed concrete pipe pile of the present invention comprises a prestressed steel frame 1, a concrete pile body 2, an end plate A3, an end plate B4, a bearing assembly 5 and a pile head assembly 6, the interior of the concrete pile body 2 is wrapped with the prestressed steel frame 1, one end of the prestressed steel frame 1 is clamped with the end plate A3, the other end of the prestressed steel frame 1 is clamped with the end plate B4, one end of the end plate B4 is welded with the pile head assembly 6, one end surface of the pile head assembly 6 is welded with the bearing assembly 5, and the other end of the bearing assembly 5 is a matching mechanism with the end plate A3;

[0030] The outer wall of the prestressed steel frame 1 is coated with an anti-corrosion coating, and the prestressed steel frame 1 is coated with the anti-corrosion coating before pouring the pipe piles, so that the formed prestressed concrete pipe piles can still maintain good corrosion resistance after long-term use.

[0031] like Figure 1 , Figure 3 , Figure 4 and Figure 7As shown, the pile head assembly 6 includes a pile head base 62 welded to one end face of the end plate B4, one end face of the pile head base 62 is provided with a pile head mounting groove, and the pile head 61 is slidably matched in the pile head mounting groove, the bearing assembly 5 includes a pressure-bearing rod 51 welded at one end to the center position of the back side of the pile head 61, the other end of the pressure-bearing rod 51 is fixedly installed with a positioning ring 52 by bolts, a connecting support assembly 53 is arranged above the positioning ring 52, and the connecting support assembly 53 is sleeved on the outer wall of the pressure-bearing rod 51, a hammer head 54 is inserted above the connecting support assembly 53, and the hammer head 54 and one end of the pressure-bearing rod 51 are a matching mechanism, a plurality of notches are provided on the inner wall of the end plate A3, and the notches and the connecting support assembly 53 are a matching mechanism, the inner diameter of the end plate B4 is the same as the diameter of the circle where the inner wall of the notch provided in the end plate A3 is located, and the pile head A circular hole is provided at the center of the base 62, and the diameter of the circular hole is larger than the outer diameter of the pressure-bearing rod 51. The pressure-bearing rod 51 is a stepped shaft with a hollow structure, and the pressure-bearing rod 51 is made of metal material. An L-shaped slot is provided on the inner wall of one end of the fixing positioning ring 52 of the pressure-bearing rod 51, and the L-shaped slot and the hammer head 54 are a matching mechanism. The hammer head 54 is a stepped shaft structure, the diameter of the first step is the same as the inner diameter of the pressure-bearing rod 51, the diameter of the second step is the same as the diameter of the steps at both ends of the pressure-bearing rod 51, and the maximum diameter of the top is the same as the outer diameter of the limit ring 531. A protrusion is embedded on the outer wall of the bottom end of the first step of the hammer head 54, and the protrusion and the L-shaped slot are a matching mechanism. When the hammer head 54 is matched in the pressure-bearing rod 51, the overall height of the hammer head 54 and the pressure-bearing rod 51 is greater than the distance between the mounting surface of the pile head 61 in the pile head base 62 and the upper end surface of the end plate A3.

[0032] When making the pipe pile, the end plate A3 and the end plate B4 are clamped at the two ends of the processed prestressed steel frame 1. The prestressed steel frame 1, the end plate A3, the end plate B4, and the concrete pile body are made into an integrated prestressed concrete pipe pile through production equipment. When piling is required during construction, the pile head assembly 6 and the bearing assembly 5 are installed in the prestressed concrete pipe pile for piling operation. First, one end of the pressure-bearing rod 51 is fixedly welded to the center position of the back of the pile head 61, and one end of the pressure-bearing rod 51 needs to be concentric with the pile head 61, and then the pressure-bearing rod 51 is passed through the pile head base 62. , so that the pile head 61 and the pile head base 62 are matched, and then the other end of the pressure rod 51 is inserted into the prestressed concrete pipe pile, so that the pile head base 62 coincides with one end face of the end plate B4, and the connecting support component 53 is installed in the groove opened at one end of the end plate A3. The connecting support component 53 is sleeved on the outer wall of the step at one end of the pressure rod 51. The circular hole opened by the connecting support component 53, the pile head 61 and the pile head base 62 supports the pressure rod 51, and the pile head base 62 is fixedly installed on one end face of the end plate B4 by bolts, and then the connecting gap is welded, and wait for the self After cooling, the first step of the hammer head 54 is inserted into one end of the pressure rod 51 and the connecting support assembly 53, and the convex block set at the bottom end of the first step is matched in the L-shaped slot. When the pipe pile is erected during hoisting, the pile head 61 and the pressure rod 51 tend to move downward under the action of gravity. At this time, the lower end surface of the top cone of the hammer head 54 fits with the upper end surface of the connecting support assembly 53, and the pile head 61 and the pressure rod 51 are pulled up so that they will not fall off the pipe pile. When the pile head 61 encounters a hard soil layer during piling, the back of the pile head 61 fits with the pile head base 62. At this time, the hammer The step surface of the second step of the hammer head 54 fits with the top of the pressure-bearing rod 51, and the upper end surface of the hammer head 54 is higher than the upper end surface of the end plate A3. When hammering, the hammer head 54 is first subjected to the impact force, thereby causing the pile head 61 to advance. When the pile head 61 moves downward, the upper end surface of the hammer head 54 is lower than the upper end surface of the end plate A3, thereby causing the pipe pile to move downward under the impact force. In this process, the pile head 61 and the pressure-bearing rod 51 are used to reduce the resistance of the pipe pile when it moves downward, and at the same time reduce the intensity of the impact load on the pipe pile itself when hammering, thereby avoiding the occurrence of cracks in the pile body when piling in hard soil layers.

[0033] like Figure 5 and Figure 6As shown, the connecting support assembly 53 includes a limit ring 531 sleeved on the outer wall of the pressure-bearing rod 51, and the limit ring 531 is circumferentially provided with a plurality of threaded holes penetrating both ends. A plurality of support rods 532 are circumferentially fixedly welded on the outer wall of the limit ring 531, and a limit block 533 is fixedly welded on the other end of the support rod 532, and the limit block 533 is slidably fitted in the groove opened in the end plate A3. When the pipe piles need to be docked, the height of the connecting support assembly 53 is adjusted by installing bolts on the limit ring 531, so that the limit block 533 is exposed, and the exposed height is between 1 / 3 and 1 / 2 of the total height of the limit block 533. At this time, the upper end surface height of the pressure-bearing rod 51 is lower than the height of the limit ring 531. When docking, the connecting support assembly 53 is installed at the end plate A3 of the upper pipe pile, and the pressure-bearing rod 51 and the hammer head 54 are installed. Then, the pipe piles are hoisted and connected so that the inner surface of the end plate B4 of the upper pipe pile fits the arc outer wall of the limit block 533, and the pressure rod 51 in the upper pipe pile is inserted in the limit ring 531. Then, the upper and lower layers of the pipe piles are clamped and welded. After welding, they are naturally cooled and then the steel hoop is removed for piling operations. In this process, the connecting support assembly 53 supports the upper and lower pressure rods 51 so that they are always concentric with the pipe piles to enable them to play a role. In addition, at the connection between the two pipe piles, the connecting support assembly 53 supports the inner wall of the connection between the pipe piles, so that the lateral load on the weld during the hammering process is reduced, thereby avoiding weld cracking and pile breaking during the construction process. When the pipe piles are driven into the designed depth, the connecting support assembly 53, the hammer head 54 and the pressure rod 51 in the upper pipe pile are removed to facilitate subsequent pile cutting and core pouring operations.

[0034] Working principle:

[0035] Anti-corrosion treatment: Before pouring the pipe piles, the prestressed steel frame 1 is coated with an anti-corrosion layer so that the formed prestressed concrete pipe piles can still maintain good corrosion resistance after long-term use. Then the end plates A3 and B4 are clamped at both ends of the treated prestressed steel frame 1, and the prestressed steel frame 1, end plates A3, end plates B4, and concrete pile bodies are made into an integrated prestressed concrete pipe pile through production equipment.

[0036] Hoisting process: When piling, the pile head assembly 6 and the bearing assembly 5 are installed in the prestressed concrete pipe pile for piling operation. First, one end of the pressure-bearing rod 51 is fixedly welded to the center position of the back of the pile head 61, and one end of the pressure-bearing rod 51 needs to be concentric with the pile head 61, and then the pressure-bearing rod 51 is passed through the pile head base 62, so that the pile head 61 and the pile head base 62 are matched, and then the other end of the pressure-bearing rod 51 is inserted into the prestressed concrete pipe pile, so that the pile head base 62 coincides with one end face of the end plate B4, and the connecting support assembly 53 is installed in the groove opened at one end of the end plate A3, and the connecting support assembly 53 is sleeved on the outer wall at the step at one end of the pressure-bearing rod 51. The circular holes formed by the component 53, the pile head 61 and the pile head base 62 support the pressure rod 51. The pile head base 62 is fixedly installed on one end face of the end plate B4 by bolts, and then the connecting gap is welded. After natural cooling, the first step of the hammer head 54 is inserted into the end of the pressure rod 51 that cooperates with the connecting support component 53. The protrusion set at the bottom end of the first step cooperates in the L-shaped slot. When the pipe pile is erected during lifting, the pile head 61 and the pressure rod 51 tend to move downward under the action of gravity. At this time, the lower end face of the top cone of the hammer head 54 fits with the upper end face of the connecting support component 53, and the pile head 61 and the pressure rod 51 are pulled up so that they will not fall off the pipe pile.

[0037] Hammering the bottom pile: During pile driving, when the pile head 61 encounters a hard soil layer, the back of the pile head 61 fits against the pile head base 62. At this time, the step surface of the second step of the hammer head 54 fits against the top of the pressure rod 51. The upper end surface of the hammer head 54 is higher than the upper end surface of the end plate A3. During hammering, the hammer head 54 is first subjected to the impact force, causing the pile head 61 to advance. After the pile head 61 moves downward, the upper end surface of the hammer head 54 is lower than the upper end surface of the end plate A3, causing the pipe pile to move downward under the impact force. In this process, the pile head 61 and the pressure rod 51 are used to reduce the resistance of the pipe pile when it moves downward, and at the same time reduce the impact load strength of the pipe pile itself when hammering, thereby avoiding cracks in the pile body during pile driving in hard soil layers.

[0038] Butt jointing of pipe piles: during butt jointing, the connecting support assembly 53 is installed at the end plate A3 of the upper pipe pile, and the pressure rod 51 and the hammer head 54 are installed, and then the butt jointing is performed, so that the inner surface of the end plate B4 of the upper pipe pile fits the arc outer wall of the limit block 533, and the pressure rod 51 in the upper pipe pile is inserted into the limit ring 531, and then the upper and lower pipe piles are clamped and welded, and after the welding is completed, they are naturally cooled and then the steel hoop is removed for pile driving. In this process, the connecting support assembly 53 supports the upper and lower pressure rods 51, so that they are always concentric with the pipe piles to play a role. In addition, at the connection of the two pipe piles, the connecting support assembly 53 supports the inner wall of the connection of the pipe piles, so that the lateral load on the weld during the hammering process is reduced, thereby avoiding the occurrence of weld cracking and pile breaking during the construction process. When the pipe pile is driven into the designed depth, the connecting support assembly 53, the hammer head 54 and the pressure rod 51 in the upper pipe pile are removed to facilitate the subsequent pile cutting and core pouring operations.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A corrosion-resistant prestressed concrete pipe pile, comprising a prestressed steel frame (1), a concrete pile body (2), an end plate A (3), an end plate B (4), a bearing assembly (5) and a pile head assembly (6), characterized in that: A prestressed steel frame (1) is wrapped inside the concrete pile body (2); an end plate A (3) is clamped on one end of the prestressed steel frame (1); an end plate B (4) is clamped on the other end of the prestressed steel frame (1); a pile head assembly (6) is welded to one end of the end plate B (4); a bearing assembly (5) is welded to one end surface of the pile head assembly (6); and the other end of the bearing assembly (5) and the end plate A (3) form a matching mechanism; The pile head assembly (6) comprises a pile head base (62) welded to one end surface of the end plate B (4); one end surface of the pile head base (62) is provided with a pile head mounting groove, and a pile head (61) is slidably fitted in the pile head mounting groove; The bearing assembly (5) comprises a pressure-bearing rod (51) with one end welded to the center position of the back side of the pile head (61); a positioning ring (52) is fixedly mounted on the other end of the pressure-bearing rod (51) by means of bolts; a connecting support assembly (53) is arranged above the positioning ring (52); the connecting support assembly (53) is sleeved on the outer wall of the pressure-bearing rod (51); a hammer head (54) is inserted above the connecting support assembly (53); and the hammer head (54) and one end of the pressure-bearing rod (51) form a matching mechanism; When piling is required during construction, the pile head assembly (6) and the bearing assembly (5) are installed in the prestressed concrete pipe pile for piling operation. First, one end of the pressure-bearing rod (51) is fixedly welded to the center position of the back of the pile head (61), and one end of the pressure-bearing rod (51) needs to be concentric with the pile head (61). Then, the pressure-bearing rod (51) is passed through the pile head base (62) so that the pile head (61) and the pile head base (62) are matched. Then, the other end of the pressure-bearing rod (51) is passed through the prestressed concrete pipe pile so that the pile head (61) and the pile head base (62) are matched. The head base (62) overlaps with one end face of the end plate B (4), a connecting support assembly (53) is installed in a notch provided at one end of the end plate A (3), the connecting support assembly (53) is sleeved on the outer wall at the step of one end of the pressure-bearing rod (51), the connecting support assembly (53), the pile head (61) and the circular hole provided in the pile head base (62) support the pressure-bearing rod (51), the pile head base (62) is fixedly installed on one end face of the end plate B (4) by bolts, and then the connecting gap is welded, and the pressure-bearing rod (51) is supported by the natural rotation of the pile head base (62). After cooling, the first step of the hammer head (54) is inserted into one end of the pressure rod (51) and the connecting support assembly (53), and the protrusion arranged at the bottom end of the first step is matched in the L-shaped slot. When the pipe pile is erected during hoisting, the pile head (61) and the pressure rod (51) tend to move downward under the action of gravity. At this time, the lower end surface of the top round table of the hammer head (54) fits with the upper end surface of the connecting support assembly (53), and the pile head (61) and the pressure rod (51) are pulled up so that they will not fall off from the pipe pile. When the pile head (61) encounters a hard soil layer, the back side of the pile head (61) fits with the pile head base (62), and at this time, the step surface of the second step of the hammer head (54) fits with the top of the pressure-bearing rod (51), and the upper end surface of the hammer head (54) is higher than the upper end surface of the end plate A (3). When hammering, the hammer head (54) is first subjected to the impact force, so that the pile head (61) advances. When the pile head (61) moves downward, the upper end surface of the hammer head (54) is lower than the upper end surface of the end plate A (3), so that the pipe pile is subjected to the impact force and moves downward; The pressure bearing rod (51) is a stepped shaft with a hollow structure, and the pressure bearing rod (51) is made of metal material. An L-shaped groove is provided on the inner wall of one end of the pressure bearing rod (51) fixing the positioning ring (52), and the L-shaped groove and the hammer head (54) form a matching mechanism; The inner wall of the end plate A (3) is provided with a plurality of slots, and the slots and the connecting support assembly (53) form a matching mechanism; The connecting support assembly (53) comprises a limit ring (531) sleeved on the outer wall of the pressure bearing rod (51), the limit ring (531) is circumferentially provided with a plurality of threaded holes penetrating through both ends, a plurality of support rods (532) are circumferentially fixedly welded on the outer wall of the limit ring (531), a limit block (533) is fixedly welded on the other end of the support rod (532), and the limit block (533) is slidably fitted in a groove opened in the end plate A (3); The hammer head (54) is a stepped shaft structure, the diameter of the first step is the same as the inner diameter of the pressure-bearing rod (51), the diameter of the second step is the same as the diameter of the steps at both ends of the pressure-bearing rod (51), the maximum diameter of the top end is the same as the outer diameter of the limit ring (531), a convex block is embedded on the outer wall of the bottom end of the first step of the hammer head (54), and the convex block and the L-shaped slot form a matching mechanism, when the hammer head (54) is matched in the pressure-bearing rod (51), the overall height of the hammer head (54) and the pressure-bearing rod (51) is greater than the distance between the mounting surface of the pile head 61 in the pile head base (62) and the upper end surface of the end plate A (3); The inner diameter of the end plate B (4) is the same as the diameter of the circle where the inner wall of the notch of the end plate A (3) is located; A circular hole is provided at the center of the pile head base (62), and the diameter of the circular hole is larger than the outer diameter of the pressure bearing rod (51); An anti-corrosion coating is applied on the outer wall of the prestressed steel bar frame (1).

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