Prestressed pipe pile pile head plugging device

Abstract

The present invention provides a plugging device for the pile head of a prestressed pipe pile, which is characterized by comprising: a lower plugging plate, an upper plugging plate arranged directly above the lower plugging plate and having the same shape and size as the lower plugging plate, a sealing rubber ring arranged around the edge between the lower plugging plate and the upper plugging plate, four jacking components arranged uniformly in the circumferential direction between the plugging plate and the upper plugging plate, a bearing plate arranged directly above the upper plugging plate and having a diameter smaller than that of the upper plugging plate, a vertical push block, a vertical push rod, and a pre-tightening component. The device of the present invention can quickly plug the pile head of a prestressed pipe pile, not only ensuring the plugging effect of the pile head, but also being simple to disassemble and reusable, thereby being beneficial to improving the construction quality and construction efficiency of prestressed pipe piles.

Description

Technical Field

[0001] The invention belongs to the technical field of PHC prestressed pipe pile construction, and particularly relates to a device for plugging the pile head of a prestressed pipe pile. Background Art

[0002] PHC pipe piles are prestressed high-strength concrete pipe piles. Since the concrete strength of the PHC pipe pile body is high, it can be driven into dense sand layers and strongly weathered rock layers. Through the extrusion effect, the bearing capacity of the pile tip can be increased by 70% - 80% compared with the original soil quality, and the side friction resistance of the pile can be increased by 20% - 40%. Therefore, the single-pile bearing capacity of PHC pipe piles is high. PHC pipe piles bear the upper load jointly by side resistance and end resistance. Therefore, various soil qualities such as strongly weathered rock layers, completely weathered rock layers, hard clay layers or dense sand layers (or pebble layers) can be selected as the bearing stratum, and it has strong adaptability to geological conditions with large fluctuations in the bearing stratum. Currently, it has been widely used in various high-rise buildings below 60 floors and low-capacity pile foundations of industrial and civil buildings, as well as engineering foundations such as railways, highways, bridges, ports, docks, water conservancy, municipal engineering, structures, and large equipment.

[0003] The construction methods of PHC pipe piles mainly include hammering and static pressure. Among them, for the construction of PHC pipe piles by the static pressure method, when the static pressure pile sinking construction is completed, usually the pipe pile is higher than the ground elevation. Therefore, the pipe pile needs to be cut below the ground elevation first, and then immediately sealed with C25 micro-expansion concrete, and then the pile head of the pipe pile is plugged to prevent people from easily stepping into the pile hole and getting injured, resulting in accidental safety accidents. At the same time, it can also prevent soil and sewage from entering the pipe pile and affecting the quality of the subsequent pile core concrete pouring. Currently, for the plugging of the PHC pipe pile head, the method of using an iron plate to plug is usually adopted, but there are the following deficiencies or drawbacks: If the iron plate is welded to the pile head, it is not only time-consuming and laborious, but also the welded iron plate is not easy to remove, which will affect the subsequent construction progress; if the iron plate is covered on the pile head, the iron plate is easy to shift, resulting in ineffective plugging due to improper sealing. Summary of the Invention

[0004] In view of the above problems, the invention provides a device for plugging the pile head of a prestressed pipe pile. Using the device of the invention, the pile head of the prestressed pipe pile can be quickly plugged, which can not only ensure the plugging effect of the pile head, but also is simple to disassemble and can be reused, thus being beneficial to improving the construction quality and construction efficiency of the prestressed pipe pile.

[0005] The invention is realized through the following technical solutions.

[0006] The prestressed pipe pile pile head plugging device is characterized by comprising: a lower plugging plate, an upper plugging plate arranged directly above the lower plugging plate and having the same shape and size as the lower plugging plate, a sealing rubber ring arranged around the edge between the lower plugging plate and the upper plugging plate, four jacking components arranged uniformly in the circumferential direction between the plugging plate and the upper plugging plate, a bearing plate arranged directly above the upper plugging plate and having a diameter smaller than that of the upper plugging plate, a vertical push block, a vertical push rod, and a pre-tightening component;

[0007] The jacking component includes a jacking plate that makes a jacking fit with the inner wall of the sealing rubber ring, a spring fixing sleeve fixedly arranged between the lower plugging plate and the upper plugging plate, push block clamping plates arranged on both sides of the horizontal push block and fixedly connected to the upper plugging plate at the upper end and to the lower plugging plate at the lower end, a horizontal push block that can slide horizontally in the rectangular chute enclosed by the push block clamping plates, the lower plugging plate, and the upper plugging plate, a return spring with one end connected to the spring fixing sleeve and the other end connected to the horizontal push block, a trapezoidal horizontal push block, and a horizontal push rod; the horizontal push rod sequentially penetrates through the spring coils of the return spring and the spring fixing sleeve, and one end of the horizontal push rod is fixedly connected to the inner side surface of the jacking plate and the other end is fixedly connected to the horizontal push block;

[0008] The vertical push rod penetrates through the upper plugging plate and can slide freely up and down, and the upper end of the vertical push rod is fixedly connected to the upper plugging plate and the lower end is connected to the vertical push block;

[0009] The vertical push block is a trapezoid, and the four side surfaces of the vertical push block respectively make a jacking fit with the side surfaces of the horizontal push blocks in the four jacking components;

[0010] The pre-tightening component includes a pre-tightening connecting rod and a pre-tightening nut; the pre-tightening connecting rod sequentially penetrates through the upper plugging plate, the vertical push rod, and the vertical push block from top to bottom, and the upper end of the pre-tightening connecting rod is threadedly connected to the pre-tightening nut and the lower end is fixedly connected to the lower plugging plate.

[0011] As a preferred technical solution, the present invention further includes a closed seam collar, and the closed seam collar includes a fixed sleeve fixedly sleeved on the outer edge of the bearing plate and plastic filaments vertically fixed on the outer side surface of the fixed sleeve.

[0012] As a specific technical solution, the outer diameter of the closed seam collar is 0.5 - 1 cm larger than the diameter of the pile hole in the prestressed pipe pile pile head.

[0013] As a preferred technical solution, the present invention further includes a handle (11) arranged on the upper surface of the upper plugging plate.

[0014] As a preferred technical solution, lubricating oil is applied to the contact surfaces of the horizontal push block with the push block clamping plates, the lower plugging plate, and the upper plugging plate.

[0015] As a preferred technical solution, the upper end of the sealing rubber ring is fixedly connected to the lower surface edge of the upper plugging plate, and the lower end of the sealing rubber ring is fixedly connected to the upper surface edge of the lower plugging plate.

[0016] As a preferred technical solution, the diameter of the bearing plate is 1 - 2 cm smaller than the diameter of the upper plugging plate.

[0017] As a preferred technical solution, the outer wall of the pushing plate is arc-shaped along both the circumference and height direction of the sealing rubber ring.

[0018] As a preferred technical solution, the radian of the outer wall of the pushing plate along the circumferential direction of the sealing rubber ring is 35 - 40°.

[0019] As a specific technical solution, the upper plugging plate, the lower plugging plate and the bearing plate are made of steel plates, and the thickness of the steel plates is 4 - 6 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects: Through the mutual cooperation among the pushing assembly, the bearing plate, the vertical pushing block, the vertical push rod and the pre-tightening assembly, the present invention can push the sealing rubber ring outwards, so that the whole sealing rubber ring expands outwards and abuts against the inner wall of the prestressed pipe pile head, thereby achieving the effect of plugging the prestressed pipe pile head. Compared with the traditional method of using steel plates for plugging, when using the device of the present invention to plug the prestressed pipe pile head, only need to slowly lower the device of the present invention into the pile hole, and then rotate the pre-tightening nut downwards; when it is necessary to remove the device of the present invention from the pile hole, just rotate the pre-tightening nut upwards, and the device of the present invention can be taken out from the pile hole; Therefore, the device of the present invention can quickly plug the prestressed pipe pile head, which can not only ensure the plugging effect of the pile head, but also has the characteristics of simple disassembly and reusable, thus being beneficial to reducing the construction cost and improving the construction quality and construction efficiency of the prestressed pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present invention;

[0022] Figure 2 is Figure 1 the cross-sectional view at A - A in

[0023] Figure 3 is the front view of the present invention;

[0024] Figure 4 is the top view of the present invention;

[0025] Figure 5 is a schematic diagram of plugging the pile hole of the pipe pile by using the present invention;

[0026] Figure 6 is Figure 5Enlarged schematic diagram at B in the figure;

[0027] The meanings of the various markings in the above figures are as follows: lower sealing plate 1, upper sealing plate 2, sealing rubber ring 3, jacking assembly 4, jacking plate 401, horizontal push rod 402, return spring 403, horizontal push block 404, push block clamping plate 405, spring fixing sleeve 406, bearing plate 5, vertical push block 6, vertical push rod 7, prestressed pipe pile pile head 8, pre-tightening assembly 9, pre-tightening connecting rod 901, pre-tightening nut 902, closing ring 10, fixing sleeve 1001, plastic wire 1002, handle 11. Specific implementation mode

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] Embodiment

[0031] For the prestressed pipe pile pile head plugging device, please refer to Figures 1 to 4 , which includes: a lower sealing plate 1, an upper sealing plate 2 disposed directly above the lower sealing plate 1 and having the same shape and size as the lower sealing plate 1, a sealing rubber ring 3 disposed around the edges between the lower sealing plate 1 and the upper sealing plate 2, four jacking assemblies 4 uniformly arranged in the circumferential direction between the lower sealing plate 1 and the upper sealing plate 2, a bearing plate 5 disposed directly above the upper sealing plate 2 and having a diameter smaller than that of the upper sealing plate 2, a vertical push block 6, a vertical push rod 7, and a pre-tightening assembly 9;

[0032] The pushing component 4 includes a pushing plate 401 that is in pushing cooperation with the inner wall of the sealing rubber ring 3, a spring fixing sleeve 406 fixedly arranged between the lower sealing plate 1 and the upper sealing plate 2, pushing plate clamps 405 arranged on both sides of the horizontal pushing block 404 and fixedly connected to the upper sealing plate 2 at the upper end and to the lower sealing plate 1 at the lower end, a horizontal pushing block 404 that can slide horizontally along the rectangular chute enclosed by the pushing plate clamps 405, the lower sealing plate 1 and the upper sealing plate 2, a return spring 403 with one end connected to the spring fixing sleeve 406 and the other end connected to the horizontal pushing block 404, a trapezoidal horizontal pushing block 404, and a horizontal push rod 402; the horizontal push rod 402 passes through the coils of the return spring 403 and the spring fixing sleeve 406 in sequence, and one end of the horizontal push rod 402 is fixedly connected to the inner side surface of the pushing plate 401 and the other end is fixedly connected to the horizontal pushing block 404;

[0033] The vertical push rod 7 passes through the upper sealing plate 2 in a freely sliding up and down manner, and the upper end of the vertical push rod 7 is fixedly connected to the upper sealing plate 2 and the lower end is connected to the vertical pushing block 6;

[0034] The vertical pushing block 6 is a trapezoid body, and the four side surfaces of the vertical pushing block 6 are respectively in pushing cooperation with the side surfaces of the horizontal pushing blocks 404 in the four pushing components 4;

[0035] The pre-tightening component 9 includes a pre-tightening connecting rod 901 and a pre-tightening nut 902; the pre-tightening connecting rod 901 passes through the upper sealing plate 2, the vertical push rod 7 and the vertical pushing block 6 in a movable manner from top to bottom, and the upper end of the pre-tightening connecting rod 901 is threadedly connected to the pre-tightening nut 902 and the lower end is fixedly connected to the lower sealing plate 1;

[0036] Based on the above structure, when the bearing plate 5 is not subjected to an external vertical force, that is, the horizontal pushing block 404 only bears the horizontal thrust exerted by the bearing plate 5, the self-weights of the vertical push rod 7 and the vertical pushing block 6, at this time the return spring 403 will be in a natural state, and the outer wall of the pushing plate 401 is not in contact with the inner wall of the sealing rubber ring 3 (but the distance between the outer wall of the pushing plate 401 and the inner wall of the sealing rubber ring 3 should not be too large), so that the pushing plate 401 will not push against the sealing rubber ring 3 to cause the overall outward expansion of the sealing rubber ring 3; preferably, when the return spring 403 is in a natural state, the radial distance between the outer wall of the pushing plate 401 and the inner wall of the sealing rubber ring 3 is 1 to 3 mm;

[0037] When the pressure plate 5 is subjected to the vertical external force, the return spring 403 is in a compressed state, and the vertical external force on the pressure plate 5 can be generated by the soil piled on the pressure plate 5, or by the pre-tightening nut 902 rotating downward, or by both of the above; at this time, the vertical external force on the pressure plate 5 will be transmitted to the vertical push block 6 through the vertical push rod 7, and then the vertical push block 6 will cooperate with the top support of the horizontal push block 404 to convert the vertical external force into a horizontal thrust applied to the horizontal push block 404, so that the horizontal push block 404 slides horizontally outward and then drives the horizontal push rod 402 and the top push plate 401 outward in turn. When the external force disappears, the return spring 403 can push the horizontal push block 404 to move inward (toward the vertical push block 6), thereby driving the push plate 401 to break away from the contact with the sealing rubber ring 3. Due to the elasticity of the sealing rubber ring 3 itself, the sealing rubber ring 3 will shrink as a whole and will not abut against the inner wall of the prestressed pipe pile head 8. At this time, the return spring 403 returns to its natural state.

[0038] Based on the above principle, the method of using the device of the present invention is as follows: Figures 5 - 6 , lift the pile head plugging device of the present invention to the position just above the prestressed pipe pile head 8, then slowly lower it vertically until the device of the present invention is located about 10 cm below the prestressed pipe pile head 8, then tighten the pretightening nut 902 downward, the sealing rubber ring 3 will expand outward as a whole and contact with the hole wall of the prestressed pipe pile head, under the friction between the outer wall of the sealing rubber ring and the hole wall of the prestressed pipe pile head, firstly, the position of the pile head plugging device of the present invention can be fixed, and secondly, the contact between the outer wall of the sealing rubber ring and the hole wall of the prestressed pipe pile head can achieve a better sealing effect to prevent rainwater and sewage from entering the pipe pile, thereby effectively plugging the pile head; and in the construction process, if mud falls into the blocked pile head and mechanical equipment passes on the pile head, the mud will Although the load on the pressure plate 5 will increase and transmit the external vertical force, at the same time, the pressure plate 5 will convert the vertical force generated by the soil into a horizontal thrust to increase the overall outward expansion force of the outer wall of the sealing rubber ring, thereby increasing the friction between the outer wall of the sealing rubber ring and the hole wall of the prestressed pipe pile head to resist the adverse effects of the vertical force generated by the outside world; when it is necessary to remove it from the prestressed pipe pile head, it is only necessary to rotate the pre-tightening nut 902 upward. At this time, the push plate 401 will be out of contact with the sealing rubber ring 3, and due to the elastic effect of the sealing rubber ring 3 itself, the sealing rubber ring 3 will shrink as a whole without abutting against the inner wall of the prestressed pipe pile head 8, thereby eliminating the friction between the outer wall of the sealing rubber ring and the hole wall of the prestressed pipe pile head, so that the device of the present invention can be taken out.

[0039] In order to smoothly lower the device of the present invention and install it in the pile hole of the prestressed pipe pile head, and at the same time ensure that the sealing rubber ring 3 can achieve a sealing effect after expanding outward, in a specific implementation scheme, the diameters of the upper sealing plate 2 and the lower sealing plate 1 should be slightly smaller than the pile hole diameter of the prestressed pipe pile head, and the outer diameter of the sealing rubber ring 3 should be the same as the diameter of the upper sealing plate 2, or slightly smaller than the diameter of the upper sealing plate 2; preferably, the diameters of the upper sealing plate 2 and the lower sealing plate 1 are 3 to 5 mm smaller than the pile hole diameter of the prestressed pipe pile head; because the outer diameter of the sealing rubber ring 3 will slightly increase after a long time and multiple outward expansions, preferably, the outer diameter of the sealing rubber ring 3 is 2 to 3 mm smaller than the diameter of the upper sealing plate 2, so that the sealing rubber ring 3 does not affect the installation of the device of the present invention.

[0040] Furthermore, in a preferred embodiment, the upper sealing plate 2, the lower sealing plate 1 and the pressure plate 5 are made of steel plates with a thickness of 4 to 6 mm, which can ensure that the upper sealing plate 2, the lower sealing plate 1 and the pressure plate 5 have a certain strength and are not easily deformed.

[0041] In order to enable the device of the present invention to be smoothly lowered into the pile hole, the diameter of the pressure plate 5 should be smaller than the inner diameter of the pile hole. However, after the device of the present invention is lowered into the pile hole, there will be a gap between the pressure plate 5 and the inner wall of the pile hole. In order to prevent soil from entering the gap between the pressure plate 5 and the inner wall of the pile hole to the bottom of the pressure plate 5 and hindering the downward movement of the pressure plate 5, further, in a preferred embodiment, please refer to Figures 1 to 6 The present invention also includes a closed-seam ring 9, which includes a fixing sleeve 1001 fixed on the outer side of the edge of the pressure plate 5 in an annular manner, and a plastic wire 1002 vertically fixed on the outer side of the fixing sleeve 1001; when the device of the present invention is lowered into the pile hole, the closed-seam ring 9 will be accommodated in the gap between the pressure plate 5 and the inner wall of the pile hole, thereby sealing the gap.

[0042] Furthermore, in a preferred embodiment, the outer diameter of the closed-seam collar 9 is 0.5 to 1.0 cm larger than the diameter of the pile hole in the prestressed pipe pile head 8; when installing the device of the present invention, the closed-seam collar 9 will block the gap between the pressure plate 5 and the inner wall of the prestressed pipe pile head, and even if the end of the plastic wire 1002 will contact the inner wall of the prestressed pipe pile head, the plastic wire 1002 has a certain flexibility, and therefore the plastic wire 1002 will not affect the installation of the device of the present invention.

[0043] Further, in a preferred embodiment, see Figure 1 , Figure 3 and Figure 4 The present invention further comprises a handle 11 disposed on the upper surface of the upper blocking plate 2 , so that the device of the present invention can be installed and disassembled by holding the handle 11 .

[0044] To reduce the resistance of the horizontal pushing block 404 during movement, further, in a preferred embodiment, lubricating oil is applied to the contact surfaces of the horizontal pushing block 404 with the pushing block clamping plate 405, the lower sealing plate 1, and the upper sealing plate 2.

[0045] To prevent soil, sewage, etc. from entering the cavity between the lower end and the lower sealing plate 1, further, in a preferred embodiment, the upper end of the sealing rubber ring 3 is fixedly connected to the edge of the lower surface of the upper sealing plate 2, and the lower end of the sealing rubber ring 3 is fixedly connected to the edge of the upper surface of the lower sealing plate 1.

[0046] Further, in a preferred embodiment, the diameter of the bearing plate 5 is 1 - 2 cm smaller than the diameter of the upper sealing plate 2.

[0047] To enable the pushing plate 401 to better push and support the entire sealing rubber ring 3 to expand outward, further, in a preferred embodiment, please refer to Figure 1 、 Figure 2 and Figure 6 , the outer wall of the pushing plate is arc-shaped along the circumference and height direction of the sealing rubber ring 3, and the radian of the outer wall of the pushing plate 401 along the circumferential direction of the sealing rubber ring 3 is 35 - 40°; based on the above settings, the pushing plates 401 of the four pushing assemblies 4 can almost surround the inner wall of the sealing rubber ring 3 for pushing and supporting, so that the entire sealing rubber ring 3 expands outward; and, since the outer wall of the pushing plate is arc-shaped along the height direction of the sealing rubber ring 3, the middle position of the sealing rubber ring 3 can contact the arc-shaped protruding part of the pushing plate, which can easily make the sealing rubber ring 3 expand outward and contact the inner wall of the pipe pile.

Claims

1. Prestressed pipe pile pile head plugging device, characterized in that Comprising: A lower sealing plate (1), an upper sealing plate (2) arranged directly above the lower sealing plate (1) and having the same shape and size as the lower sealing plate (1), a sealing rubber ring (3) arranged around the edges between the lower sealing plate (1) and the upper sealing plate (2), four jacking components (4) arranged circumferentially and evenly between the lower sealing plate (1) and the upper sealing plate (2), a bearing plate (5) arranged directly above the upper sealing plate (2) and having a diameter smaller than that of the upper sealing plate (2), a vertical push block (6), a vertical push rod (7), a pre-tightening component (9); The jacking component (4) includes a jacking plate (401) that makes a jacking fit with the inner wall of the sealing rubber ring (3), a spring fixing sleeve (406) fixedly arranged between the lower sealing plate (1) and the upper sealing plate (2), push block clamping plates (405) arranged on both sides of the horizontal push block (404) and having their upper ends fixedly connected to the upper sealing plate (2) and their lower ends fixedly connected to the lower sealing plate (1), a horizontal push block (404) that can slide horizontally in the rectangular chute enclosed by the push block clamping plates (405), the lower sealing plate (1) and the upper sealing plate (2), a return spring (403) having one end connected to the spring fixing sleeve (406) and the other end connected to the horizontal push block (404), a trapezoidal horizontal push block (404), and a horizontal push rod (402); the horizontal push rod (402) is arranged successively through the coils of the return spring (403) and the spring fixing sleeve (406), and one end of the horizontal push rod (402) is fixedly connected to the inner side surface of the jacking plate (401) and the other end is fixedly connected to the horizontal push block (404); The vertical push rod (7) penetrates through the upper sealing plate (2) and can slide freely up and down, and the upper end of the vertical push rod (7) is fixedly connected to the upper sealing plate (2) and the lower end is connected to the vertical push block (6); The vertical push block (6) is a trapezoid body, and the four side surfaces of the vertical push block (6) respectively make a jacking fit with the side surfaces of the horizontal push blocks (404) in the four jacking components (4); The pre-tightening component (9) includes a pre-tightening connecting rod (901) and a pre-tightening nut (902); the pre-tightening connecting rod (901) successively penetrates through the upper sealing plate (2), the vertical push rod (7) and the vertical push block (6) from top to bottom, and the upper end of the pre-tightening connecting rod (901) is threadedly connected to the pre-tightening nut (902) and the lower end is fixedly connected to the lower sealing plate (1); Lubricating oil is applied to the contact surfaces of the horizontal push block (404) with the push block clamping plates (405), the lower sealing plate (1) and the upper sealing plate (2); the upper end of the sealing rubber ring (3) is fixedly connected to the lower surface edge of the upper sealing plate (2), and the lower end of the sealing rubber ring (3) is fixedly connected to the upper surface edge of the lower sealing plate (1).

2. The prestressed pipe pile pile head plugging device according to claim 1, characterized in that It further includes a closing seam sleeve (10), and the closing seam sleeve (10) includes a fixing sleeve (1001) with a ring sleeve fixed on the outer side of the edge of the bearing plate (5), and plastic filaments (1002) vertically fixed on the outer side surface of the fixing sleeve (1001).

3. The prestressed pipe pile pile head plugging device according to claim 2, characterized in that The outer diameter of the closing seam sleeve (10) is 0.5 - 1 cm larger than the diameter of the pile hole in the prestressed pipe pile pile head (8).

4. The prestressed pipe pile pile head plugging device according to claim 1, characterized in that It further includes a handle (11) disposed on the upper surface of the upper sealing plate (2).

5. The prestressed pipe pile pile head plugging device according to claim 1, characterized in that The diameter of the bearing plate (5) is 1-2 cm smaller than the diameter of the upper sealing plate (2).

6. The prestressed pipe pile pile head plugging device according to claim 1, characterized in that The outer wall of the push plate (401) is arc-shaped along the circumference and height direction of the sealing rubber ring (3).

7. The prestressed pipe pile pile head plugging device according to claim 6, characterized in that The radian of the outer wall of the push plate (401) along the circumferential direction of the sealing rubber ring (3) is 35-40°.

8. The prestressed pipe pile pile head plugging device according to claim 1, characterized in that The upper sealing plate (2), the lower sealing plate (1) and the bearing plate (5) are made of steel plates with a thickness of 4-6 mm.

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