Connecting structure for concrete piles

Abstract

The utility model discloses a connecting structure for a concrete pile, which comprises an upper sleeve arranged in an upper section pile, a lower sleeve arranged in a lower section pile, an inserting rod, a limiting connecting sleeve and a locking piece, and the inserting rod is fixedly connected with the upper sleeve; the limiting connecting sleeve and the locking piece are mounted in the lower sleeve; when the upper sleeve is connected with the lower sleeve, the inserting rod penetrates through the limiting connecting sleeve to be connected with the locking piece; a flexible plugging check ring is arranged on the upper end face of the limiting connecting sleeve, the lower surface of the flexible plugging check ring is in sealed connection with the upper surface of the limiting connecting sleeve, and the upper surface of the flexible plugging check ring is higher than the end face of the lower pile section. The utility model has the beneficial effects that the flexible blocking check ring is additionally arranged at the port of the lower sleeve, so that gap filling materials such as epoxy resin can be prevented from entering the lower sleeve, and the connection reliability of upper and lower section piles is realized; and meanwhile, the flexible plugging check ring avoids hard impact on the end faces of the upper and lower sections of piles in the pile connecting process, so that the connecting quality problem is avoided.

Description

Technical Field

[0001] The utility model relates to a connecting device for concrete piles, in particular to a connecting structure for concrete piles, and belongs to the technical field of production of concrete precast members. Background Art

[0002] At present, in foundation engineering, seamless-end concrete precast piles mostly adopt plug-in mechanical connection. In this connection method, upper and lower connecting sleeves are embedded at the connecting ends of the upper and lower piles. An insertion rod is installed in the upper connecting sleeve, and a limit nut, a card, and a spring are installed in the lower connecting sleeve. When connecting the piles, the insertion rod of the upper pile is inserted into the lower connecting sleeve of the lower pile, and the connection of the upper and lower piles is realized through the compression of the card and the spring. However, since the concrete end faces between the upper and lower piles cannot be guaranteed to be absolutely flat and smooth, there will inevitably be gaps at the connection surfaces of the upper and lower piles after pile connection, resulting in durability damage of the joint and skip waves in small-strain detection in the use environment. Therefore, it is often necessary to apply a sealing material such as epoxy resin to the upper end face of the lower pile to fill the gaps. Since the lower connecting sleeve at the end face of the lower pile is lower than the pile end face, a large amount of epoxy resin will flow into the lower connecting sleeve. After the insertion rod of the upper pile is inserted, the spring and the lock piece in the lower connecting sleeve will have an increased reset resistance or even cannot be reset after compression or expansion, resulting in the failure of the connection between the insertion rod and the lock piece. Summary of the Invention

[0003] Object of the Invention: The object of the utility model is to provide a connecting structure for concrete piles aiming at the problems existing in the prior art. The utility model sets a flexible sealing retaining ring at the upper port of the lower sleeve to prevent epoxy resin or similar gap-filling materials from entering the lower sleeve, thereby realizing the effective connection of the upper and lower piles.

[0004] Technical Solution: A connecting structure for concrete piles includes an upper sleeve arranged in the upper pile, a lower sleeve arranged in the lower pile, an insertion rod, a limit connecting sleeve, and a locking member. The insertion rod is fixedly connected with the upper sleeve; the limit connecting sleeve and the locking member are installed inside the lower sleeve; when the upper sleeve and the lower sleeve are connected, the insertion rod passes through the limit connecting sleeve and is connected with the locking member; a flexible sealing retaining ring is arranged on the upper end face of the limit connecting sleeve, the lower surface of the flexible sealing retaining ring is hermetically connected with the upper surface of the limit connecting sleeve, and the upper surface of the flexible sealing retaining ring is higher than the end face of the lower pile.

[0005] By arranging a flexible sealing retaining ring on the upper end face of the limit connecting sleeve, hermetically connecting the lower surface of the flexible sealing retaining ring with the upper surface of the limit connecting sleeve, and making the upper surface of the flexible sealing retaining ring higher than the end face of the lower pile, the utility model can prevent the gap-filling material from entering the lower sleeve when applying a sealing material such as epoxy resin to the upper end face of the lower pile to fill the gaps.

[0006] Preferred option: To ensure the coating thickness of the sealing material and effective sealing, the upper end face of the flexible plugging retaining ring is 1 mm - 5 mm higher than the end face of the lower pile section. The coating thickness is less than the height difference between the upper end face of the flexible plugging retaining ring and the end face of the lower pile section, which can effectively prevent the sealing material from entering the lower sleeve during the coating process. At the same time, in order to improve the reliability of the connection between the upper and lower pile sections, the thickness of the flexible plugging retaining ring cannot be too thick.

[0007] Preferred option: To improve the sealing performance of the flexible plugging retaining ring, the flexible plugging retaining ring is a hollow ring structure, including a plugging boss and a retaining ring body. The plugging boss is located at the bottom of the retaining ring body, and the plugging boss matches the process card slot on the limit connecting sleeve.

[0008] The lower surface of the retaining ring body contacts the upper surface of the limit connecting sleeve to form a seal; at the same time, the plugging boss is filled into the process card slot, which can limit the displacement of the flexible plugging retaining ring, prevent displacement caused by touching the flexible plugging retaining ring during the coating of the sealing material, affect the sealing performance, and can further improve the sealing performance.

[0009] Preferred option: To further improve the sealing performance of the flexible plugging retaining ring, the flexible plugging retaining ring further includes a sealing ring. The retaining ring body is placed above the limit connecting sleeve, and the outer diameter of the sealing ring matches the inner diameter of the limit connecting sleeve. By setting the sealing ring, the gap between the plugging boss and the process card slot can be blocked, and the gap between the retaining ring body and the limit connecting sleeve can also be blocked, further improving the sealing performance of the plugging retaining ring.

[0010] Preferred option: To further improve the sealing performance of the flexible plugging retaining ring, the height of the sealing ring is greater than or equal to the height of the plugging boss. By making the height of the sealing ring greater than or equal to the height of the plugging boss, the gap between the inner side of the plugging boss and the bottom of the process card slot near the inner diameter can be blocked, further improving the sealing performance of the flexible plugging retaining ring.

[0011] Preferred option: To further improve the sealing performance of the plugging retaining ring, the outer diameter of the sealing ring is in interference fit with the inner diameter of the limit connecting sleeve. The interference fit can further improve the sealing performance, and at the same time fix the relative position of the flexible plugging retaining ring and the limit connecting sleeve, preventing displacement caused by touching the flexible plugging retaining ring during the coating of the sealing material, which affects the sealing performance.

[0012] Preferred option: To further improve the sealing performance of the plugging retaining ring, an open valve is provided at the upper part of the central hole of the retaining ring body. When the inserting rod is inserted, the valve can be opened by extrusion. The open valve forms a semi-sealed structure. There are 4 - 6 valves arranged at the upper part of the central hole of the retaining ring body. When the clamping part of the inserting rod is inserted, the valve can be opened by extrusion to form a seal with the clamping part.

[0013] Preferred option: To further improve the sealing performance of the flexible plugging retaining ring, the flexible plugging retaining ring is an integrally formed silicone rubber ring. The integrally formed silicone rubber ring can be compressed and deformed to absorb a certain impact force, avoiding hard impacts on the end faces of the upper and lower pile sections, thereby preventing the concrete on the end faces of the upper and lower pile sections from breaking, enabling better filling of gap filling materials such as epoxy resin into the connection end faces of the upper and lower pile sections, and reducing connection quality problems caused by uneven concrete on the pile end faces.

[0014] Preferred option: To improve the connection efficiency and connection reliability, the inserting rod includes a clamping portion that is clamped with the locking member and a threaded connection portion that is connected to the upper sleeve. The threaded connection portion is located above the clamping portion; a clamping portion is provided at the center of the locking member. When the upper sleeve and the lower sleeve are connected, the clamping portion of the inserting rod cooperates with the clamping portion of the locking member to restrict the pulling back of the inserting rod. When the upper sleeve and the lower sleeve are connected, the inserting rod sequentially passes through the flexible plugging retaining ring and the limit connection sleeve and is connected to the locking member in a quick and reliable anti-withdrawal manner. When the inserting rod and the locking member are installed in place, the plugging boss is located in the process card slot, and the upper and lower surfaces of the flexible plugging retaining ring are in close contact with the inserting rod and the limit connection sleeve respectively, improving the sealing performance after installation.

[0015] Preferred option: To improve the sealing effect, an unthreaded stop portion is provided at the bottom of the threaded connection portion; the outer diameter of the limit connection sleeve is provided with a threaded portion and a limit portion. The threaded portion cooperates with the internal thread at the upper part of the lower sleeve; the limit portion is located above the threaded portion. The setting of the stop portion can prevent the threaded connection portion of the inserting rod from entering the upper sleeve too deeply, and the stop portion is exposed outside the upper sleeve and is in full contact with the upper surface of the flexible plugging retaining ring; the setting of the limit portion can prevent the limit connection sleeve from entering the lower sleeve too deeply, and the limit portion is exposed outside the lower sleeve and is in full contact with the lower surface of the flexible plugging retaining ring, which can increase the contact area and improve the sealing effect.

[0016] Beneficial effects: By adding a flexible plugging retaining ring at the port of the lower sleeve in the present utility model, it can prevent gap filling materials such as epoxy resin from entering the lower sleeve, ensure the effective opening, closing, compression and rebound of the locking member and the spring in the lower sleeve, and achieve the reliability of the connection between the upper and lower pile sections; at the same time, the flexible plugging retaining ring can be compressed and deformed to absorb a certain impact force during the connection process of the piles, avoiding hard impacts on the end faces of the upper and lower pile sections, thereby preventing the concrete on the end faces of the upper and lower pile sections from breaking, enabling better filling of gap filling materials such as epoxy resin into the connection end faces of the upper and lower pile sections, and reducing connection quality problems caused by uneven concrete on the pile end faces. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0018] Figure 1 Structural schematic diagram of the connection state of the upper and lower piles of the present invention;

[0019] Figure 2 Structural schematic diagram of the installation of a flexible sealing ring on the lower pile of the present invention;

[0020] Figure 3 Structural schematic diagram of the insertion rod of the present invention;

[0021] Figure 4 Structural schematic diagram of the limit connection sleeve of the present invention;

[0022] Figure 5 First axonometric view of the first implementation of the sealing ring of the present invention;

[0023] Figure 6 Second axonometric view of the first implementation of the sealing ring of the present invention;

[0024] Figure 7 Bottom view of the first implementation of the sealing ring of the present invention;

[0025] Figure 8 First axonometric view of the second implementation of the sealing ring of the present invention;

[0026] Figure 9 Second axonometric view of the second implementation of the sealing ring of the present invention;

[0027] Figure 10 Bottom view of the second implementation of the sealing ring of the present invention. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 to the present utility model.

[0030] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0031] As Figure 1 and 2 As shown, a connecting structure for a concrete pile includes an upper sleeve 1 provided in the upper pile section, a lower sleeve 2 provided in the lower pile section, an insertion rod 3, a limit connecting sleeve 4 and a locking member 5. The insertion rod 3 is fixedly connected to the upper sleeve 1; the limit connecting sleeve 4 and the locking member 5 are installed inside the lower sleeve 2; when the upper sleeve 1 and the lower sleeve 2 are connected, the insertion rod 3 passes through the limit connecting sleeve 4 and is connected to the locking member 5; characterized in that: a flexible sealing retaining ring 6 is provided on the upper end surface of the limit connecting sleeve 4, and the lower surface of the flexible sealing retaining ring 6 is sealingly connected to the upper surface of the limit connecting sleeve 4, and the upper surface of the flexible sealing retaining ring 6 is higher than the end surface of the lower pile section.

[0032] By providing the flexible sealing retaining ring 6 on the upper end surface of the limit connecting sleeve 4 in the present utility model, the lower surface of the flexible sealing retaining ring 6 is sealingly connected to the upper surface of the limit connecting sleeve 4, and the upper surface of the flexible sealing retaining ring 6 is higher than the end surface of the lower pile section, it can prevent the gap filling material from entering the lower sleeve when filling the gap with a sealing material such as epoxy resin on the upper end surface of the lower pile section.

[0033] As Figure 2 As shown, in order to ensure the coating thickness of the sealing material and effective sealing, the upper end surface of the flexible sealing retaining ring 6 is 1 mm - 5 mm higher than the end surface of the lower pile section. The coating thickness is less than the height difference between the upper end surface of the flexible sealing retaining ring 6 and the end surface of the lower pile section, which can effectively prevent the sealing material from entering the lower sleeve 2 during the coating process. At the same time, in order to improve the reliability of the connection between the upper and lower pile sections, the thickness of the flexible sealing retaining ring 6 cannot be too thick. Embodiment

[0034] As shown Figure 4 in 5 Figures 6 and 7, in order to improve the sealing performance of the flexible sealing retaining ring 6, the flexible sealing retaining ring 6 is a hollow ring structure, including a sealing boss 61 and a retaining ring body 62. The sealing boss 61 is located at the bottom of the retaining ring body 62, and the sealing boss 62 matches the process card slot 41 on the limit connecting sleeve 4.

[0035] The lower surface of the retaining ring body 62 contacts the upper surface of the limit connecting sleeve 4 to form a seal; at the same time, the sealing boss 61 is filled into the process card slot 41, which can limit the displacement of the flexible sealing retaining ring 6, avoid touching the flexible sealing retaining ring 6 during the coating of the sealing material and causing displacement, affecting the sealing performance, and can further improve the sealing performance.

[0036] As shown Figure 4 in 5 Figures 6 and 7, in order to further improve the sealing performance of the flexible sealing retaining ring 6, the flexible sealing retaining ring 6 further includes a sealing ring 63. The retaining ring body 62 is placed above the limit connecting sleeve 4, and the outer diameter of the sealing ring 63 matches the inner diameter of the limit connecting sleeve 4.

[0037] By providing the sealing ring 63, the gap between the sealing boss 61 and the process card slot 41 can be sealed, and the gap between the retaining ring body 62 and the limit connecting sleeve 4 can also be sealed, further improving the sealing performance of the retaining ring 6.

[0038] As shown Figure 6 in Figure 6, in order to further improve the sealing performance of the flexible sealing retaining ring 6, the height of the sealing ring 63 is greater than or equal to the height of the sealing boss 61. By having the height of the sealing ring 63 greater than or equal to the height of the sealing boss 61, the gap between the inner side of the sealing boss 61 and the bottom of the process card slot 41 near the inner diameter can be sealed, further improving the sealing performance of the flexible sealing retaining ring 6.

[0039] As shown Figure 1 in 2 Figures 4 and 6, in order to further improve the sealing performance of the retaining ring 6, the outer diameter of the sealing ring 63 has an interference fit with the inner diameter of the limit connecting sleeve 4. By means of the interference fit, the sealing performance can be further improved, and at the same time, the relative position of the flexible sealing retaining ring 6 and the limit connecting sleeve 4 can be fixed, avoiding touching the flexible sealing retaining ring 4 during the coating of the sealing material and causing displacement, affecting the sealing performance.

[0040] In order to further improve the sealing performance of the flexible sealing retaining ring 6, the flexible sealing retaining ring 6 is an integrally formed silicone rubber ring. The integrally formed silicone rubber ring can be compressed and deformed to absorb a certain impact force, avoiding hard impacts on the end faces of the upper and lower pile sections, thereby preventing the concrete on the end faces of the upper and lower pile sections from being broken, enabling better filling of gap filling materials such as epoxy resin into the connecting end faces of the upper and lower pile sections, and reducing connection quality problems caused by uneven concrete on the pile end faces.

[0041] As Figure 1 , 3 , 4, 5, 6 and 7 show, in order to improve the connection efficiency and connection reliability, the insertion rod 3 includes a clamping portion 31 that is clamped with the locking member 5 and a threaded connection portion 32 that is connected to the upper sleeve 1, and the threaded connection portion 32 is located above the clamping portion 31; a clamping portion 51 is provided at the center of the locking member 5. When the upper sleeve 1 and the lower sleeve 2 are connected, the clamping portion 31 of the insertion rod 3 cooperates with the clamping portion 51 of the locking member 5 to restrict the pulling back of the insertion rod 3.

[0042] When the upper sleeve 1 and the lower sleeve 2 are connected, the insertion rod 3 sequentially passes through the flexible sealing retaining ring 6 and the limit connection sleeve 4 and is connected to the locking member 5 in a quick and reliable anti-retreat manner. When the insertion rod 3 and the locking member 5 are installed in place, the sealing boss 61 is located in the process card slot 41, and the upper and lower surfaces of the flexible sealing retaining ring 6 are in close contact with the insertion rod 3 and the limit connection sleeve 4 respectively, improving the sealing performance after installation.

[0043] As Figure 3 and 4 show, in order to improve the sealing effect, an unthreaded stop portion 33 is provided at the bottom of the threaded connection portion 32; a threaded portion 42 and a limit portion 43 are provided on the outer diameter of the limit connection sleeve 4, and the threaded portion 42 is matched with the internal thread on the upper part of the lower sleeve 2; the limit portion 43 is located above the threaded portion 42.

[0044] The setting of the stop portion 33 can prevent the threaded connection portion 32 of the insertion rod 3 from entering the upper sleeve 1 too deeply, and the stop portion 33 is exposed outside the upper sleeve 1 and is in full contact with the upper surface of the flexible sealing retaining ring 6; the setting of the limit portion 43 can prevent the limit connection sleeve 4 from entering the lower sleeve 2 too deeply, and the limit portion 43 is exposed outside the lower sleeve 3 and is in full contact with the lower surface of the flexible sealing retaining ring 6, which can increase the contact area and improve the sealing effect. Embodiment

[0045] As Figure 8 , 9As shown in Figs. 9 and 10, in order to further improve the sealing performance of the plugging retaining ring 6, an open valve 64 is provided at the upper part of the central hole of the retaining ring body 62. When the inserting rod 3 is inserted, the valve 64 can be opened under extrusion. The open valve 64 forms a semi-sealed structure. There are 4 to 6 valves 64 provided at the upper part of the central hole of the retaining ring body 62. When the clamping part 31 of the inserting rod 3 is inserted, the valve 64 can be opened under extrusion to form a seal with the clamping part 31.

[0046] As Figure 4 , 8 As shown in Figs. 7, 9 and 10, in order to improve the sealing performance of the flexible plugging retaining ring 6, the flexible plugging retaining ring 6 is a hollow ring structure, including a plugging boss 61 and a retaining ring body 62. The plugging boss 61 is located at the bottom of the retaining ring body 62, and the plugging boss 62 matches with the process card slot 41 on the limit connecting sleeve 4.

[0047] The lower surface of the retaining ring body 62 contacts the upper surface of the limit connecting sleeve 4 to form a seal; at the same time, the plugging boss 61 is filled into the process card slot 41, which can limit the displacement of the flexible plugging retaining ring 6, avoid touching the flexible plugging retaining ring 6 during the coating of the sealing material to cause displacement and affect the sealing performance, and can further improve the sealing performance.

[0048] As Figure 4 , 8 As shown in Figs. 7, 9 and 10, in order to further improve the sealing performance of the flexible plugging retaining ring 6, the flexible plugging retaining ring 6 further includes a sealing ring 63. The retaining ring body 62 is placed above the limit connecting sleeve 4, and the outer diameter of the sealing ring 63 matches the inner diameter of the limit connecting sleeve 4.

[0049] By providing the sealing ring 63, the gap between the plugging boss 61 and the process card slot 41 can be plugged, and the gap between the retaining ring body 62 and the limit connecting sleeve 4 can also be plugged, further improving the sealing performance of the plugging retaining ring 6.

[0050] As Figure 9 shown, in order to further improve the sealing performance of the flexible plugging retaining ring 6, the height of the sealing ring 63 is greater than or equal to the height of the plugging boss 61. By the height of the sealing ring 63 being greater than or equal to the height of the plugging boss 61, the gap between the inner side of the plugging boss 61 and the bottom of the process card slot 41 near the inner diameter can be plugged, further improving the sealing performance of the flexible plugging retaining ring 6.

[0051] As Figure 1 , 2, as shown in Figures 4 and 9, in order to further improve the sealing performance of the plugging retaining ring 6, the outer diameter of the sealing ring 63 is in interference fit with the inner diameter of the limit connecting sleeve 4. The interference fit can further improve the sealing performance, and at the same time fix the relative position of the flexible plugging retaining ring 6 and the limit connecting sleeve 4, avoiding displacement of the flexible plugging retaining ring 4 when applying the sealing material and affecting the sealing performance.

[0052] In order to further improve the sealing performance of the flexible plugging retaining ring 6, the flexible plugging retaining ring 6 is an integrally formed silicone rubber ring. The integrally formed silicone rubber ring can be compressed and deformed to absorb a certain impact force, avoiding the hard impact on the end faces of the upper and lower pile segments, thereby preventing the concrete at the end faces of the upper and lower pile segments from being broken, enabling better filling of gap filling materials such as epoxy resin into the connecting end faces of the upper and lower pile segments, and reducing the connection quality problems caused by the unevenness of the concrete at the pile end faces.

[0053] As Figure 1 , 3 , as shown in Figures 4, 8, 9 and 10, in order to improve the connection efficiency and connection reliability, the plug rod 3 includes a clamping portion 31 that is clamped with the locking member 5 and a threaded connection portion 32 that is connected to the upper sleeve 1, and the threaded connection portion 32 is located above the clamping portion 31; a clamping portion 51 is provided at the center of the locking member 5. When the upper sleeve 1 and the lower sleeve 2 are connected, the clamping portion 31 of the plug rod 3 cooperates with the clamping portion 51 of the locking member 5 to limit the pulling back of the plug rod 3.

[0054] When the upper sleeve 1 and the lower sleeve 2 are connected, the plug rod 3 sequentially passes through the flexible plugging retaining ring 6 and the limit connecting sleeve 4 and is connected to the locking member 5 in a quick and reliable anti-withdrawal manner. When the plug rod 3 and the locking member 5 are installed in place, the plugging boss 61 is located in the process card slot 41, and the upper and lower surfaces of the flexible plugging retaining ring 6 are in close contact with the plug rod 3 and the limit connecting sleeve 4 respectively, improving the sealing performance after installation.

[0055] As Figure 3 and 4 shown, in order to improve the sealing effect, an unthreaded stop portion 33 is provided at the bottom of the threaded connection portion 32; a threaded portion 42 and a limit portion 43 are provided on the outer diameter of the limit connecting sleeve 4, and the threaded portion 42 is matched with the internal thread of the upper part of the lower sleeve 2; the limit portion 43 is located above the threaded portion 42.

[0056] The setting of the stop portion 33 can prevent the threaded connection portion 32 of the plug rod 3 from entering the upper sleeve 1 too deeply, and the stop portion 33 is exposed outside the upper sleeve 1 and is in full contact with the upper surface of the flexible plugging retaining ring 6; the setting of the limit portion 43 can prevent the limit connecting sleeve 4 from entering the lower sleeve 2 too deeply, and the limit portion 43 is exposed outside the lower sleeve 3 and is in full contact with the lower surface of the flexible plugging retaining ring 6, which can increase the contact area and improve the sealing effect.

[0057] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A connection structure for concrete piles, comprising an upper sleeve (1) arranged in an upper pile section, a lower sleeve (2) arranged in a lower pile section, an insertion rod (3), a limit connection sleeve (4) and a locking piece (5), wherein the insertion rod (3) is fixedly connected to the upper sleeve (1); the limit connection sleeve (4) and the locking piece (5) are installed inside the lower sleeve (2); when the upper sleeve (1) and the lower sleeve (2) are connected, the insertion rod (3) passes through the limit connection sleeve (4) and is connected to the locking piece (5); characterized in that: The upper end surface of the position limiting connection sleeve (4) is provided with a flexible blocking ring (6), the lower surface of the flexible blocking ring (6) is sealingly connected to the upper surface of the position limiting connection sleeve (4), and the upper surface of the flexible blocking ring (6) is higher than the end surface of the lower pile.

2. The connection structure for concrete piles according to claim 1, characterized in that: The upper end surface of the flexible blocking ring (6) is 1 mm to 5 mm higher than the end surface of the lower pile.

3. The connection structure for concrete piles according to claim 1, characterized in that: The flexible blocking retaining ring (6) is a hollow ring structure, comprising a blocking boss (61) and a retaining ring body (62), wherein the blocking boss (61) is located at the bottom of the retaining ring body (62), and the blocking boss (61) matches the process groove (41) on the limiting connecting sleeve (4).

4. The connection structure for concrete piles according to claim 3, characterized in that: The flexible blocking retaining ring (6) further comprises a sealing ring (63); the retaining ring body (62) is placed above the limiting connecting sleeve (4); and the outer diameter of the sealing ring (63) matches the inner diameter of the limiting connecting sleeve (4).

5. The connection structure for concrete piles according to claim 4, characterized in that: The height of the sealing ring (63) is greater than or equal to the height of the sealing boss (61).

6. The connection structure for concrete piles according to claim 4, characterized in that: The outer diameter of the sealing ring (63) is interference fit with the inner diameter of the limiting connecting sleeve (4).

7. The connection structure for concrete piles according to claim 3, 4, 5 or 6, characterized in that: An open valve (64) is provided at the upper portion of the central hole of the retaining ring body (62); when the insertion rod (3) is inserted, the valve (64) is squeezed and can be opened.

8. The connection structure for concrete piles according to claim 1, characterized in that: The flexible blocking ring (6) is an integrally formed silicone ring.

9. The connection structure for concrete piles according to claim 1, characterized in that: The insert rod (3) comprises a clamping portion (31) clamped with the locking element (5) and a threaded connection portion (32) connected to the upper sleeve (1), wherein the threaded connection portion (32) is located above the clamping portion (31); a clamping portion (51) is provided at the center of the locking element (5); when the upper sleeve (1) and the lower sleeve (2) are connected, the clamping portion (31) of the insert rod (3) cooperates with the clamping portion (51) of the lock element (5) to restrict the insert rod (3) from being pulled back.

10. The connection structure for concrete piles according to claim 9, characterized in that: A stopper portion (33) without threaded parts is provided at the bottom of the threaded connection portion (32); a threaded portion (42) and a limit portion (43) are provided on the outer diameter of the limit connection sleeve (4); the threaded portion (42) cooperates with the internal thread of the upper portion of the lower sleeve (2); and the limit portion (43) is located above the threaded portion (42).

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