Improved pipe pile connecting box and concrete pipe pile

Abstract

The utility model provides an improved tubular pile connecting box and concrete tubular pile, the connecting box comprises a box body, a first movable block, a second movable block, a first tower-shaped spring and a second tower-shaped spring, a containing cavity is formed in the box body, the first movable block and the second movable block are both movably arranged in the containing cavity, and the first tower-shaped spring is arranged in the containing cavity. An insertion through hole is formed between the adjacent ends of the first movable block and the second movable block, and a one-way inner sawtooth structure is arranged on the inner wall of the insertion through hole. The first tower-shaped spring and the second tower-shaped spring are both arranged in the containing cavity, the first tower-shaped spring is located at the end, away from the second movable block, of the first movable block, and the second tower-shaped spring is located at the end, away from the first movable block, of the second movable block. The pipe pile connecting box has the advantages that the size of the whole pipe pile connecting box can be effectively reduced, the application range of the pipe pile connecting box is wider, and the manufacturing cost is lower; and the first movable block and the second movable block can be better pushed to clamp the connecting pin inserted into the insertion through hole, so that the pulling resistance is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of pipe piles, in particular to an improved pipe pile connection box and a concrete pipe pile. [Background technology]

[0002] Prestressed concrete pipe piles are a kind of prefabricated high-strength concrete product with the advantages of high single pile bearing capacity, convenient transportation and wide range of selection. The reasonable selection of prestressed concrete pipe piles in construction can greatly improve the construction progress while ensuring the construction quality.

[0003] Prestressed concrete pipe piles are generally buried underground. In the actual construction process, prestressed concrete pipe piles often need to be connected. The traditional method is to connect the upper and lower sections of prestressed concrete pipe piles on site by welding. This connection method makes the construction speed slow, the cost high, and the connection quality difficult to guarantee.

[0004] In order to solve the above problems, a Chinese utility model patent with application number CN201120117627.7 discloses a mechanical meshing joint for prestressed concrete pipe piles, which includes a first end plate and a second end plate and a connecting pin respectively fixed to the connecting ends of the first section pipe pile and the second section pipe pile, wherein at least one threaded hole is provided in the circumferential direction of the first end plate, and a through hole corresponding to the threaded hole is provided on the second end plate, and two oppositely arranged clamping blocks are provided on the side of each through hole facing away from the first end plate, and first meshing teeth are provided on the opposite surfaces of the two clamping blocks, and the opposite surfaces of the two clamping blocks are provided with a first meshing tooth. Each of them contacts an elastic component. The first end of the connecting pin is provided with an external thread that can be matched with the threaded hole, and the second end is provided with a second meshing tooth. The second end of the connecting pin can be inserted into the two blocks through the through hole, and the second meshing tooth thereon can mesh with the first meshing tooth. The second end of the connecting pin is cylindrical, and the circumferential surface of the second end of the connecting pin is provided with a second meshing tooth extending in the circumferential direction. The opposite surfaces of the two blocks are concave cylindrical surfaces, and the opposite surfaces of the two blocks are provided with a first meshing tooth extending in the circumferential direction. It has the advantages of simple processing, convenient docking, high pull-out resistance, high bearing capacity, and corrosion resistance. However, the elastic component of the above-mentioned mechanical meshing joint adopts a cylindrical pressure spring. After the second end of the connecting pin is inserted between the two blocks and the pressure spring is compressed, the pressure spring still needs to occupy a long length in the connection box, resulting in the need to make the entire connection box very large, which not only limits the scope of use of the connection box, but also increases the manufacturing cost. In view of the above-mentioned problems, the inventor of this case conducted an in-depth study on the problem, and thus this case was created. [Contents of the utility model]

[0005] The technical problem to be solved by the utility model is to provide an improved pipe pile joint and concrete pipe pile, which can effectively reduce the volume of the connection box, thereby solving the problem that the volume of the existing connection box needs to be made very large, which not only limits the scope of use of the connection box but also increases the manufacturing cost.

[0006] The utility model is achieved in this way:

[0007] In a first aspect, an improved pipe pile connection box comprises:

[0008] A box body, wherein a containing cavity is formed in the box body;

[0009] A first movable block and a second movable block, wherein the first movable block and the second movable block are both movably disposed in the accommodating cavity, a plug-in through hole is formed between adjacent ends of the first movable block and the second movable block, and an inner wall of the plug-in through hole is provided with a unidirectional inner sawtooth structure;

[0010] It also includes a first conical spring and a second conical spring; the first conical spring and the second conical spring are both arranged in the accommodating cavity, and the first conical spring is located at an end of the first movable block away from the second movable block, and the second conical spring is located at an end of the second movable block away from the first movable block.

[0011] Furthermore, before the connecting pin is inserted into the plug-in through hole, the size of the plug-in through hole is smaller than the size of the insertion end of the connecting pin; after the connecting pin is inserted into the plug-in through hole, the lengths of the first conical spring and the second conical spring after compression are equal to 1.5-2.5 times the wire diameter of the spring.

[0012] Furthermore, the cavity wall of the accommodating cavity is provided with a positioning protrusion separating the first movable block from the second movable block, and the outer wall of the box body is formed with a recess at a position corresponding to the positioning protrusion.

[0013] Furthermore, the positioning protrusion is integrally formed with the box body.

[0014] Furthermore, the small end of the first conical spring abuts against the first movable block, and the large end of the first conical spring abuts against the inner wall of the accommodating cavity; the small end of the second conical spring abuts against the second movable block, and the large end of the second conical spring abuts against the inner wall of the accommodating cavity.

[0015] Furthermore, the first conical spring and the second conical spring are both conical helical springs with circular cross-sections.

[0016] Furthermore, the first movable block is formed with a first plane that presses against the first conical spring in the middle part facing one end of the first conical spring, and the first movable block is formed with first arc surfaces on both sides of the first plane; the second movable block is formed with a second plane that presses against the second conical spring in the middle part facing one end of the second conical spring, and the second movable block is formed with second arc surfaces on both sides of the second plane.

[0017] Furthermore, the upper edge of the box body is formed with a flange outwardly, and the outer circle of the flange is a wave-shaped structure.

[0018] In a second aspect, a concrete pipe pile comprises a first pipe pile section, a second pipe pile section, a connecting pin and the above-mentioned improved pipe pile connecting box; the first pipe pile section and the second pipe pile section are connected via the connecting pin and the improved pipe pile connecting box.

[0019] Furthermore, the box body of the improved pipe pile connection box is buried in the connecting end of the second pipe pile section, and the plug-in through hole on the improved pipe pile connection box faces the connecting end of the first pipe pile section; the connecting end of the first pipe pile section is formed with a screw hole at a position corresponding to the plug-in through hole, one end of the connecting pin is threadedly connected to the screw hole on the first pipe pile section, and the other end of the connecting pin is meshedly connected to the plug-in through hole on the second pipe pile section.

[0020] By adopting the technical solution of the utility model, at least the following beneficial effects are achieved:

[0021] 1. By arranging a first conical spring at one end of the first movable block away from the second movable block, and arranging a second conical spring at one end of the second movable block away from the first movable block, since the conical spring is characterized by small volume, large load and variable stiffness, in the same installation space, the conical spring of the same volume can withstand greater pressure than the ordinary compression spring, and correspondingly can store more energy, and can withstand greater pressure under the same deformation amount; therefore, by adopting the technical solution of the utility model, not only can the volume of the entire pipe pile connection box be effectively reduced, so that the use range of the pipe pile connection box is wider and the manufacturing cost is lower; but also the first movable block and the second movable block can be better pushed to clamp the connecting pin inserted into the plug-in through hole, thereby improving the pull-out resistance.

[0022] 2. By setting a positioning protrusion between the first movable block and the second movable block, on the one hand, when the connecting pin is not inserted, the positioning protrusion can be used in cooperation with the first conical spring and the second conical spring to realize the positioning of the first movable block and the second movable block, and on the other hand, it can prevent the first movable block and the second movable block from being too close, thereby facilitating the insertion of the connecting pin into the plug-in through hole between the first movable block and the second movable block during assembly.

[0023] 3. The first movable block is designed to have a first plane that matches the first conical spring, and first arc surfaces are formed on both sides of the first plane; similarly, the second movable block has a second plane that matches the second conical spring, and second arc surfaces are formed on both sides of the second plane. This makes it convenient to install the first movable block and the second movable block into the accommodating cavity, and can better compress the first conical spring and the second conical spring into a sheet-like structure.

[0024] 4. The upper edge of the box body is designed to have a flange extending outward, and the outer circle of the flange is a wavy structure, so that when the box body is pre-buried in the connecting end of the pipe pile, the contact area between the box body and the pipe pile can be increased, so that the box body can be better combined with the connecting end of the pipe pile, ensuring that the box body is not easy to loosen.

Brief Description of the Drawings

[0025] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0026] Figure 1 It is a top view of an improved pipe pile connection box of the utility model;

[0027] Figure 2 It is a front view of an improved pipe pile connection box of the utility model;

[0028] Figure 3 It is a cross-sectional view of an improved pipe pile connection box of the utility model;

[0029] Figure 4 It is a cross-sectional view of a concrete pipe pile of the utility model;

[0030] Figure 5 It is a structural schematic diagram of a connecting pin in the utility model.

[0031] Description of reference numerals:

[0032] Improved pipe pile connection box 100;

[0033] Concrete pipe piles 200;

[0034] Box body 1, accommodation cavity 11, positioning convex part 12, concave part 13, flange 14, wavy structure 141;

[0035] A first movable block 2, a first plane 21, and a first arc surface 22;

[0036] A second movable block 3, a second plane 31, and a second arc surface 32;

[0037] A first conical spring 4;

[0038] Second conical spring 5;

[0039] Insertion through hole 6, one-way inner sawtooth structure 61;

[0040] First pipe pile section 7, screw connection hole 71, first end plate 72;

[0041] A second pipe pile section 8, a second end plate 81, and a circular through hole 82;

[0042] Connecting pin 9, external thread 91, one-way external serration structure 92. [Specific implementation method]

[0043] In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] It should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing these embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. In addition, the terms "first", "second", etc., etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0045] Example 1

[0046] See also Figures 1 to 3 As shown, a preferred embodiment of an improved pipe pile connection box 100 of the utility model, the improved pipe pile connection box 100 comprises:

[0047] A box body 1, wherein a receiving cavity 11 is formed in the box body 1; the box body 1 is in a square structure, and the bottom of the box body 1 is closed, and the top of the box body 1 is open, so as to facilitate the installation of required components into the receiving cavity 11;

[0048] A first movable block 2 and a second movable block 3, wherein the first movable block 2 and the second movable block 3 are both movably disposed in the accommodating cavity 11, and an inserting through hole 6 is formed between one end of the first movable block 2 and the second movable block 3 adjacent to each other, and an inner wall of the inserting through hole 6 is provided with a one-way inner sawtooth structure 61, so as to utilize the one-way inner sawtooth structure 61 to achieve meshing with a connecting pin 9 inserted into the inserting through hole 6;

[0049] A first conical spring 4 and a second conical spring 5, wherein the first conical spring 4 and the second conical spring 5 are both arranged in the accommodating cavity 11, and the first conical spring 4 is located at an end of the first movable block 2 away from the second movable block 3, and the second conical spring 5 is located at an end of the second movable block 3 away from the first movable block 2.

[0050] When the improved pipe pile connection box 100 of the utility model is used, when the connecting pin 9 is not inserted into the plug-in through hole 6, the first movable block 2 and the second movable block 3 move toward the middle position under the elastic force of the first conical spring 4 and the second conical spring 5; when the connecting pin 9 is inserted into the plug-in through hole 6, the first movable block 2 and the second movable block 3 can move toward both ends under the pressure of the connecting pin 9 and compress the first conical spring 4 and the second conical spring 5, and the first conical spring 4 can apply a reverse force to the first movable block 2, and the second conical spring 5 can apply a reverse force to the second movable block 3, so that the connecting pin 9 can be clamped by the unidirectional inner serrated structure 61 in the plug-in through hole 6.

[0051] The utility model adopts a method of arranging a first conical spring 4 at the end of the first movable block 2 away from the second movable block 3, and arranging a second conical spring 5 at the end of the second movable block 3 away from the first movable block 2. Since the conical spring is characterized by small volume, large load and variable stiffness, in the same installation space, the conical spring of the same volume can withstand greater pressure than the ordinary compression spring, and correspondingly can store more energy, and can withstand greater pressure under the same deformation amount; therefore, by adopting the technical solution of the utility model, not only can the volume of the entire pipe pile connection box be effectively reduced, so that the use range of the pipe pile connection box is wider and the manufacturing cost is lower; but also the first movable block 2 and the second movable block 3 can be better pushed to clamp the connecting pin 9 inserted into the plug-in through hole 6, thereby improving the pull-out resistance.

[0052] In some embodiments of the utility model, before the plug-in through hole 6 is inserted into the connecting pin 9, the size of the plug-in through hole 6 is smaller than the size of the insertion end of the connecting pin 9, so that when the connecting pin 9 is inserted into the plug-in through hole 6, the connecting pin 9 can squeeze the first movable block 2 and the second movable block 3, so that the first movable block 2 and the second movable block 3 move outward and compress the first conical spring 4 and the second conical spring 5, and the first movable block 2 and the second movable block 3 reliably clamp the connecting pin 9 by means of the deformation pressure of the first conical spring 4 and the second conical spring 5;

[0053] After the plug-in through hole 6 is inserted into the connecting pin 9, the lengths of the first conical spring 4 and the second conical spring 5 after being compressed are both equal to 1.5-2.5 times of the wire diameter of the spring, that is, the first conical spring 4 and the second conical spring 5 can be approximately sheet-like structures after being compressed, which is not only conducive to making the volume of the pipe pile connection box smaller, but also the deformation of the first conical spring 4 and the second conical spring 5 is large, which can more reliably clamp the connecting pin 9. Preferably, the lengths of the first conical spring 4 and the second conical spring 5 after being compressed are both equal to twice of the wire diameter of the spring.

[0054] In some embodiments of the utility model, the cavity wall of the accommodating cavity 11 is provided with a positioning protrusion 12 separating the first movable block 2 from the second movable block 3, and the outer wall of the box body 1 is formed with a recess 13 at a position corresponding to the positioning protrusion 12. The utility model provides a positioning protrusion 12 between the first movable block 2 and the second movable block 3. On the one hand, when the connecting pin 9 is not inserted, the positioning protrusion 12 can be used to cooperate with the first conical spring 4 and the second conical spring 5 to realize the positioning of the first movable block 2 and the second movable block 3. On the other hand, it can prevent the first movable block 2 and the second movable block 3 from being too close, so that the connecting pin 9 can be inserted into the plug-in through hole 6 between the first movable block 2 and the second movable block 3 during assembly.

[0055] More specifically, the positioning protrusion 12 is integrally formed with the box body 1 , that is, the positioning protrusion 12 is integrally formed with the box body 1 during manufacturing, which is convenient to manufacture and can ensure the strength of the positioning protrusion 12 .

[0056] In some embodiments of the present invention, in order to make the first conical spring 4 better press against the first movable block 2, the small end of the first conical spring 4 presses against the first movable block 2, and the large end of the first conical spring 4 presses against the inner wall of the accommodating chamber 11. In order to make the second conical spring 5 better press against the second movable block 3, the small end of the second conical spring 5 presses against the second movable block 3, and the large end of the second conical spring 5 presses against the inner wall of the accommodating chamber 11.

[0057] As a preferred embodiment of the present invention, the first conical spring 4 and the second conical spring 5 are both conical helical springs with circular cross-sections. Of course, the present invention is not limited thereto, and conical helical springs with other cross-section shapes may also be used in specific implementations, for example, conical helical springs with square cross-sections.

[0058] In some embodiments of the utility model, the first movable block 2 is formed with a first plane 21 that presses against the first conical spring 4 in the middle part facing one end of the first conical spring 4, and the first movable block 2 is formed with first arc surfaces 22 on both sides of the first plane 21; the second movable block 3 is formed with a second plane 31 that presses against the second conical spring 5 in the middle part facing one end of the second conical spring 5, and the second movable block 3 is formed with second arc surfaces 32 on both sides of the second plane 31. The utility model is designed that the first movable block 2 has a first plane 21 that matches with the first conical spring 4, and the first arc surfaces 22 are formed on both sides of the first plane 21; similarly, the second movable block 3 has a second plane 31 that matches with the second conical spring 5, and the second arc surfaces 32 are formed on both sides of the second plane 31, so that the first movable block 2 and the second movable block 3 can be easily installed in the accommodating cavity 11, and the first conical spring 4 and the second conical spring 5 can be better compressed into a sheet-like structure. In addition, in some other embodiments of the utility model, a limiting protrusion (not shown) can be formed on the first plane 21 and the second plane 31, and the small ends of the first conical spring 4 and the second conical spring 5 can be limited on the limiting protrusion, so that the first conical spring 4 and the second conical spring 5 are not easy to separate from the box body 1.

[0059] In some embodiments of the utility model, the upper edge of the box body 1 is formed with a flange 14 outwardly, and the outer ring of the flange 14 is a wavy structure 141. Since the box body 1 can be pre-buried in the connecting end of the pipe pile during the specific implementation of the utility model, the upper edge of the box body 1 is designed to have a flange 14 extending outwardly, and the outer ring of the flange 14 is a wavy structure 141, so that when the box body 1 is pre-buried in the connecting end of the pipe pile, the contact area between the box body 1 and the pipe pile can be increased, so that the box body 1 can be better combined with the connecting end of the pipe pile, ensuring that the box body 1 is not easy to loosen.

[0060] Example 2

[0061] See also Figures 1 to 5As shown, a preferred embodiment of a concrete pipe pile 200 of the utility model, the concrete pipe pile 200 comprises a first pipe pile section 7, a second pipe pile section 8, a connecting pin 9 and an improved pipe pile connecting box 100. The specific structure of the improved pipe pile connecting box 100 is described in detail in Example 1, which will not be described here; the first pipe pile section 7 and the second pipe pile section 8 are connected by the connecting pin 9 and the improved pipe pile connecting box 100, and more specifically, the first pipe pile section 7 and the second pipe pile section 8 are connected by a plurality of the connecting pins 9 and the improved pipe pile connecting box 100. The connection between the first pipe pile section 7 and the second pipe pile section 8 is achieved by using the improved pipe pile connecting box 100 and the connecting pin 9, which has the advantages of simple construction, convenient connection, high pull-out resistance, etc., and the overall volume of the pipe pile connecting box is small and has a wide range of uses.

[0062] In some embodiments of the present invention, the box body 1 of the improved pipe pile connection box 100 is buried in the connection end of the second pipe pile section 8, and the plug-in through hole 6 on the improved pipe pile connection box 100 faces the connection end of the first pipe pile section 7; since the pipe pile connection box of the present invention adopts a conical spring, and the conical spring can be compressed to a certain extent to form a nearly sheet-like structure, the overall size of the pipe pile connection box can be made smaller than that of the traditional connection box. In this way, after the box body 1 of the improved pipe pile connection box 100 is buried in the connection end of the second pipe pile section 8, the box body 1 occupies a small volume, so that the strength of the second pipe pile section 8 can be guaranteed, and it can also better adapt to a variety of pipe piles of different specifications, and has a wider range of use;

[0063] The connection end of the first pipe pile section 7 is formed with a screw hole 71 at a position corresponding to the plug-in through hole 6, one end of the connecting pin 9 is threadedly connected with the screw hole 71 on the first pipe pile section 7, and the other end of the connecting pin 9 is meshedly connected with the plug-in through hole 6 on the second pipe pile section 8, so as to achieve the connection between the first pipe pile section 7 and the second pipe pile section 8. In the specific implementation of the utility model, one end of the connecting pin 9 is formed with an external thread 91, so as to achieve threaded connection with the screw hole 71 by using the external thread 91; the other end of the connecting pin 9 is formed with a one-way external serration structure 92, so as to achieve meshing with the one-way internal serration structure 61 on the inner wall of the plug-in through hole 6 by using the one-way external serration structure 92.

[0064] In some embodiments of the utility model, the first pipe pile section 7 is fixed with a first end plate 72 at the connection end, and a plurality of the screw holes 71 are arranged on the first end plate 72 along the circumferential direction; the second pipe pile section 8 is fixed with a second end plate 81 at the connection end, and a circular through hole 82 is arranged on the second end plate 81 corresponding to each of the screw holes 71, and the improved pipe pile connection box 100 is buried under each of the circular through holes 82. During the specific construction, it is only necessary to screw the external thread 91 of the connection pin 9 with the screw hole 71 on the first pipe pile section 7, and then operate the first pipe pile section 7 to pass the one-way external serration structure 92 of the connection pin 9 through the circular through hole 82, and insert it into the plug-in through hole 6 of the improved pipe pile connection box 100, which is very convenient to operate.

[0065] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An improved pipe pile connection box, comprising: A box body, wherein a receiving cavity is formed in the box body; A first movable block and a second movable block, wherein the first movable block and the second movable block are both movably disposed in the accommodating cavity, a plug-in through hole is formed between adjacent ends of the first movable block and the second movable block, and an inner wall of the plug-in through hole is provided with a unidirectional inner sawtooth structure; It is characterized in that it also includes a first conical spring and a second conical spring; the first conical spring and the second conical spring are both arranged in the accommodating cavity, and the first conical spring is located at an end of the first movable block away from the second movable block, and the second conical spring is located at an end of the second movable block away from the first movable block.

2. An improved pipe pile connection box as claimed in claim 1, characterized in that: Before the connecting pin is inserted into the plug-in through hole, the size of the plug-in through hole is smaller than the size of the insertion end of the connecting pin; after the connecting pin is inserted into the plug-in through hole, the lengths of the first conical spring and the second conical spring after compression are both equal to 1.5-2.5 times the wire diameter of the spring.

3. An improved pipe pile connection box as claimed in claim 1, characterized in that: The cavity wall of the accommodating cavity is provided with a positioning protrusion separating the first movable block from the second movable block, and the outer wall of the box body is formed with a recess at a position corresponding to the positioning protrusion.

4. An improved pipe pile connection box as claimed in claim 3, characterized in that: The positioning protrusion is integrally formed with the box body.

5. The improved pipe pile connection box according to claim 1, characterized in that: The small end of the first conical spring abuts against the first movable block, and the large end of the first conical spring abuts against the inner wall of the accommodating cavity; the small end of the second conical spring abuts against the second movable block, and the large end of the second conical spring abuts against the inner wall of the accommodating cavity.

6. The improved pipe pile connection box according to claim 1, characterized in that: The first conical spring and the second conical spring are both conical helical springs with circular cross-sections.

7. The improved pipe pile connection box according to claim 1, characterized in that: The first movable block is formed with a first plane that presses against the first conical spring in the middle part facing one end of the first conical spring, and the first movable block is formed with first arc surfaces on both sides of the first plane; the second movable block is formed with a second plane that presses against the second conical spring in the middle part facing one end of the second conical spring, and the second movable block is formed with second arc surfaces on both sides of the second plane.

8. An improved pipe pile connection box according to any one of claims 1 to 7, characterized in that: The upper edge of the box body is formed with a flange outwardly, and the outer circle of the flange is in a wave-shaped structure.

9. A concrete pipe pile, characterized in that: It comprises a first pipe pile section, a second pipe pile section, a connecting pin and the improved pipe pile connecting box as claimed in any one of claims 1 to 8; the first pipe pile section and the second pipe pile section are connected via the connecting pin and the improved pipe pile connecting box.

10. A concrete pipe pile as claimed in claim 9, characterized in that: The box body of the improved pipe pile connection box is buried in the connection end of the second pipe pile section, and the plug-in through hole on the improved pipe pile connection box faces the connection end of the first pipe pile section; the connection end of the first pipe pile section is formed with a screw hole at a position corresponding to the plug-in through hole, one end of the connection pin is threadedly connected to the screw hole on the first pipe pile section, and the other end of the connection pin is meshedly connected to the plug-in through hole on the second pipe pile section.

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