Concrete pile and mechanical pile splicing structure

Abstract

The utility model relates to a concrete pile, which comprises a pile body, a prestressed reinforcement in the pile body and an end plate at the end part of the pile body, and is characterized by further comprising a sleeve, a taper hole and an internal threaded hole are arranged in the sleeve, the internal threaded hole is positioned on the right side of the taper hole, the aperture of the taper hole is gradually enlarged from left to right, and a sleeve external thread is arranged on the periphery of the sleeve. The sleeve is in threaded connection with the end plate through the sleeve external thread, the right side of the internal threaded hole is open, and the internal threaded hole can be used for being in threaded connection with other components; the conical clamp is located in the conical hole, the peripheral face of the conical clamp is matched with the conical hole, an inner tooth hole is formed in the center of the clamp, clamping teeth are arranged on the peripheral wall of the inner tooth hole, and the prestressed reinforcement is locked by the inner tooth hole. The utility model further relates to a mechanical pile splicing structure. Compared with existing welding pile splicing, the pile splicing stability, firmness and consistency are higher, the mechanical property of the pile splicing position can be effectively improved, and additional pile splicing connecting holes do not need to be formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation engineering of various building structure systems, and in particular relates to a concrete pile that is conducive to mechanical pile connection. The utility model also relates to a mechanical pile connection structure using the above concrete pile. Background Art

[0002] Due to the high tensile strength of prestressed steel (for example, the design tensile strength of stranded steel is 1320 MPa, with a maximum tensile strength of 1960 MPa), Chinese companies and research institutions have conducted extensive research in recent years on the use of prestressed steel in centrifugal concrete piles. During the manufacturing process of these prestressed reinforced concrete piles, a key technical consideration is how to achieve locking with the end faces and tensioning of the prestressed steel.

[0003] For example, a Chinese invention patent with patent number ZL201410036904.X (publication number CN103758120B) "Pre-tensioned centrifugal concrete pile with steel strand and manufacturing method" discloses a prestressed steel strand locking mechanism, in which the steel strand at at least one end of the steel cage is tightly combined with an anchor ring, and the anchor ring has a stepped through hole, wherein the large hole portion of the stepped through hole is a threaded hole, and the small hole portion of the stepped through hole is a tapered hole with the aperture gradually increasing from the inside to the outside, a tapered chuck assembly is placed in the tapered hole, and the steel strand is locked through the inner tooth hole of the chuck assembly. The defect of this technology is that when the steel strand is inserted into the inner tooth hole of the chuck assembly, the chuck assembly clip will loosen and the inner tooth hole will deform, and it is impossible to ensure that the length of the inserted steel strand is consistent, thereby failing to ensure the consistency of the tensioning strength of each steel strand.

[0004] To this end, the invention application with publication number CN110499754A discloses a steel strand clamping component and a concrete pile, which has an external thread on the outer wall of the above-mentioned anchor ring to directly connect with the end plate, and an internal threaded hole in the anchor ring to fix the installation plug. This invention solves the problems of inconsistent insertion length and inconsistent tensioning strength of the steel strand. However, it is obvious that the above solutions all have the following defects: the internal threaded holes of the anchor rings are blocked by connecting bolts or plugs, the steel strands cannot extend beyond the end plates, and long-line production (producing two or more concrete piles in the same mold) cannot be realized, and the prestressed steel bars cannot be individually tensioned to ensure that the tension of each steel strand is consistent; in addition, the above concrete piles can only be connected by welding, and the welding method is easily affected by human factors and weather, the welding quality is not stable enough and the construction efficiency is low. Since the connecting bolts or plugs have been screwed into the internal threaded holes of the anchor rings, if the above concrete piles are to be mechanically connected, additional connecting holes need to be opened on the end plates, which will inevitably affect the strength of the concrete pile end plates and the density of the reinforcement in the pile body, making it difficult to manufacture concrete piles with ultra-high mechanical properties (because no reinforcement locking holes can be set in or around the additional connecting holes).

[0005] In summary, the aforementioned concrete piles and pile connection methods need further improvement. Utility Model Content

[0006] The first technical problem to be solved by the present invention is to provide a concrete pile with a reasonable structure and an open outer side of the internal threaded hole of the sleeve in response to the above-mentioned deficiencies in the prior art. The concrete pile with this structure allows the prestressed steel bars to extend out of the pile body so that the long-line method can be adopted for production, and each steel bar can be tensioned individually during production, thereby ensuring both production efficiency and pile body quality; and the internal threaded hole of the sleeve can be screwed into the top-butting component to tighten the conical chuck assembly to lock the prestressed steel bar, and the top-butting component can be screwed out of the internal threaded hole after the pile body is formed so that the internal threaded hole can be used for mechanical pile connection.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a concrete pile, including a pile body, prestressed steel bars in the pile body and an end plate at the end of the pile body, characterized in that: it also includes a sleeve, the sleeve has a tapered hole and an internal threaded hole axially arranged in sequence from left to right, the internal threaded hole is located on the right side of the tapered hole, the aperture of the tapered hole gradually expands from left to right, the outer periphery of the sleeve has a sleeve external thread, the sleeve is threadedly connected to the end plate through the sleeve external thread, the right side of the internal threaded hole is open, and the internal threaded hole can be used for threaded connection with other components; a tapered clamp is located in the tapered hole and its outer peripheral surface is adapted to the tapered hole, the center of the clamp has an internal tooth hole, the peripheral wall of the internal tooth hole has locking teeth, and the prestressed steel bar is locked by the internal tooth hole.

[0008] Preferably, the right end of the sleeve is flush with or lower than the outer end surface of the end plate. The outer end of the sleeve does not protrude from the end plate, which does not affect pile driving and pile connection.

[0009] As an improvement, the sleeve is shaped like a stepped shaft, with an external thread disposed on the outer periphery of the small shaft portion on the right side of the sleeve. The sleeve's shoulder abuts against the inner end surface of the end plate. This abutment serves as an installation indicator. When the sleeve is screwed into the end plate, the abutment indicates that the sleeve is properly installed, eliminating the need to observe whether the sleeve is exposed outside the end plate, making installation more user-friendly.

[0010] As a further improvement, the thread direction of the internal threaded hole on the sleeve is opposite to the thread direction of the external thread on the sleeve. In this way, when the top cylinder is screwed into place, the rotation of the top cylinder will not cause the sleeve to be screwed out of the threaded connection hole on the end plate.

[0011] The specific pile body selection may be that the pile body is centrifugally formed or vibration-formed, and the cross section of the pile body is circular, square, H-shaped or special-shaped.

[0012] Of course, the end plate is further provided with end plate threaded holes or end plate through holes that can be used to connect other components.

[0013] Compared with the existing technology, the advantages of this concrete pile are: the concrete pile with this structure allows the prestressed steel bars to extend out of the pile body so that the long-line method can be used for production, and each steel bar can be tensioned individually during production, thereby ensuring both production efficiency and pile quality; and the internal threaded hole of the sleeve can be screwed into the top support component to tighten the conical chuck assembly to lock the prestressed steel bar, and after the pile body is formed, the top support component can be screwed out of the internal threaded hole so that the internal threaded hole can be used for mechanical pile connection; no additional connecting parts are required between the end plate and the pile body, thereby reducing costs.

[0014] The second technical problem solved by the present invention is to address the defects of the above-mentioned pile connection technology, and to provide a new pile connection structure by making full use of the characteristics that the outer side of the end of the above-mentioned concrete pile is open and the internal threaded hole of the sleeve can be connected to other components for mechanical pile connection.

[0015] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a mechanical pile connection structure, characterized in that: it includes a pile connection component and a connecting member that can be set between two adjacent end plates of the two aforementioned concrete piles, the connecting member having a connecting portion and a head, and the outer periphery of the connecting portion is provided with an external connecting member thread connected to the internal threaded hole of the sleeve; the pile connection component includes two connecting plates for respectively connecting to the two adjacent end plates and a connecting rib plate for fixing the two connecting plates, each connecting plate is provided with a connecting hole corresponding to the position of each sleeve, and after the connecting member passes through the connecting hole, the external connecting member thread can be screwed into the internal threaded hole of the sleeve to fix the connecting plate and the end plate, thereby connecting and fixing the two concrete piles.

[0016] Alternatively, the connector may include an axially extending through-hole or a blind hole opening toward the sleeve. The through-hole facilitates receiving the prestressed steel bar within the internally threaded hole and secondary tensioning of the steel bar; the blind hole merely accommodates the steel bar within the internally threaded hole, facilitating screwing the connector into the internally threaded hole.

[0017] In order to facilitate screwing the top cylinder into the sleeve and enable the head to press the connecting plate onto the end plate, the head is polygonal and its outer diameter is larger than the outer diameter of the connecting part.

[0018] Compared with the existing technology, the advantages of this mechanical pile connection structure are: it is a new mechanical pile connection structure. Compared with the existing welded pile connection, the pile connection is more stable, reliable and consistent, and can effectively increase the mechanical properties of the pile connection position; compared with the existing mechanical pile connection, there is no need to set additional pile connection holes, that is, there is no need to set too many holes on the end plate, which increases the strength of the end plate and provides the possibility for high-density reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1is a cross-sectional view of an embodiment of a concrete pile;

[0020] Figure 2 A partial cross-sectional view of an embodiment of a concrete pile;

[0021] Figure 3 is a perspective schematic diagram of a sleeve in an embodiment of a concrete pile;

[0022] Figure 4 is a cross-sectional view of the top tube in the concrete pile embodiment;

[0023] Figure 5 Schematic diagram of the three-dimensional structure of the clamp in the concrete pile embodiment;

[0024] Figure 6 is a perspective exploded view of the clamp in the concrete pile embodiment;

[0025] Figure 7 This is a structural diagram of a first embodiment of a pile connection structure;

[0026] Figure 8 This is a side view of the pile connection member at the integral end portion in the first embodiment of the pile connection structure;

[0027] Figure 9 This is a structural diagram of a second embodiment of a pile connection structure;

[0028] Figure 10 It is a structural diagram of the third embodiment of the pile connection structure. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 6 Shown is a preferred embodiment of a concrete pile.

[0031] A concrete pile comprising

[0032] The pile body 4, the prestressed steel bars 2 in the pile body 4, and the end plates 3 at the ends of the pile body 4, the end plates 3 can be provided at only one end of the pile body 4, or at both ends of the pile body 4. The pile body 4 can be centrifugally formed or vibration formed, and the cross section of the pile body 4 can be circular, square, H-shaped or special-shaped.

[0033] The sleeve 1 has a tapered hole 1a and an internal threaded hole 1b arranged axially in sequence from left to right. The internal threaded hole 1b is located on the right side of the tapered hole 1a. The aperture of the tapered hole 1a gradually expands from left to right. The outer periphery of the sleeve 1 has a sleeve external thread 1c. The sleeve 1 is threadedly connected to the end plate 3 through the sleeve external thread 1c. The right side of the internal threaded hole 1b is open. The internal threaded hole 1b can be used for threaded connection with other components. The thread rotation direction of the internal threaded hole 1b on the sleeve 1 is opposite to the thread rotation direction of the sleeve external thread 1c on the sleeve 1.

[0034] The conical clamp 5 is located within the conical hole 1a, and its outer circumference matches the conical hole 1a. The clamp 5 has an inner tooth hole 51 at its center, and the peripheral wall of the inner tooth hole 51 has locking teeth 52, and the prestressed steel bar 2 is locked by the inner tooth hole 51. The clamp 5 is formed by splicing two or three clips, and the outer circumference of the clamp 5 forms a conical surface 53 that matches the conical hole 1a.

[0035] The right end of the sleeve 1 is flush with or lower than the outer end surface of the end plate 3. The sleeve 1 is in the shape of a stepped shaft, and the sleeve external thread 1c is set on the outer periphery of the small shaft part on the right side of the sleeve 1. The shoulder 11 of the sleeve 1 abuts against the inner end surface of the end plate 3.

[0036] The left and right directions in this application are based on the directions shown in the figure. If the end plate 3 is at the other end, the left and right directions are exactly opposite, that is, in use, the side close to the outer end surface of the end plate 3 is right, and the side close to the inner end surface of the end plate 3 is left.

[0037] The concrete pile of this structure allows the prestressed steel bars to extend out of the pile body so that the long-line method can be used for production, and each steel bar can be tensioned individually during production, thereby ensuring both production efficiency and pile quality; and the internal threaded hole 1b of the sleeve 1 can be screwed into the abutment component to tighten the conical chuck assembly to lock the prestressed steel bar, and after the pile body is formed, the abutment component can be screwed out of the internal threaded hole so that the internal threaded hole can be used for mechanical pile connection; there is no need to use additional connecting parts between the end plate and the pile body, which reduces costs.

[0038] like Figure 7 、 8 FIG. 1 shows a first embodiment of a mechanical pile connection structure.

[0039] A mechanical pile connection structure includes a pile connection member 7 and a connecting member 6 that can be arranged between two adjacent end plates 3 of two concrete piles of the aforementioned embodiments. The connecting member 6 has a connecting portion 61 and a head 62. The outer periphery of the connecting portion 61 is provided with a connecting member external thread 6b connected to the internal threaded hole 1b of the sleeve; the pile connection member 7 includes two connecting plates 7a for respectively connecting to the two adjacent end plates 3 and a connecting rib plate 7b for fixing the two connecting plates 7a, each connecting plate 7a is provided with a connecting hole 7a1 corresponding to the position of each sleeve 1, and after the connecting member 6 passes through the connecting hole 7a1, the connecting member external thread 6b can be screwed into the internal threaded hole 1b of the sleeve 1 to fix the connecting plate 7a to the end plate 3, thereby connecting and fixing the two concrete piles.

[0040] The connecting member 6 has an axially penetrating through hole 6a or a blind hole opening toward the sleeve 1. The head 62 is polygonal and has an outer diameter greater than that of the connecting portion 61.

[0041] like Figure 9 FIG. 2 shows a second embodiment of the mechanical pile connection structure.

[0042] This embodiment differs from the first embodiment of the mechanical pile connection structure in that end plates 3 are provided with additional threaded holes 3a or through-holes 3b for connecting to other components. The pile connection member 7 comprises two connecting plates 7a for connecting to adjacent end plates 3, respectively, and connecting ribs 7b for securing the two connecting plates 7a. Each connecting plate 7a is provided with a connecting hole 7a1 corresponding to the position of the threaded holes 3a in the end plates. After the connecting member passes through the connecting hole 7a1, the external thread 6b of the connecting member can be screwed into the threaded hole 3a in the end plate for a threaded connection.

[0043] like Figure 10 FIG. 1 shows a third embodiment of the mechanical pile connection structure.

[0044] The difference between this embodiment and the second embodiment of the mechanical pile connection structure is that: each connecting plate 7a is provided with a connecting hole 7a1 corresponding to the position of each end plate through-hole 3b, and the connecting member 6 passes through the connecting hole 7a1 and the end plate through-hole 3b and is threadedly connected to the connecting nut 8 on the back side of the end plate 3.

[0045] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "upper, lower" and the like indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A concrete pile comprising a pile body (4), prestressed steel bars (2) in the pile body (4) and an end plate (3) at the end of the pile body (4), characterized in that: Also includes A sleeve (1), wherein the sleeve (1) has a tapered hole (1a) and an internal threaded hole (1b) arranged axially in sequence from left to right, the internal threaded hole (1b) is located on the right side of the tapered hole (1a), and the aperture of the tapered hole (1a) gradually increases from left to right. The outer periphery of the sleeve (1) has a sleeve external thread (1c), and the sleeve (1) is threadedly connected to the end plate (3) via the sleeve external thread (1c). The right side of the internal threaded hole (1b) is open, and the internal threaded hole (1b) can be used for threaded connection with other components; A conical clamp (5) is located in the conical hole (1a) and its outer peripheral surface is adapted to the conical hole (1a). The center of the clamp (5) has an inner tooth hole (51), and the peripheral wall of the inner tooth hole (51) has locking teeth (52). The prestressed steel bar (2) is locked by the inner tooth hole (51).

2. The concrete pile according to claim 1, characterized in that: The right end of the sleeve (1) is flush with or lower than the outer end surface of the end plate (3).

3. The concrete pile according to claim 2, characterized in that: The sleeve (1) is in the shape of a stepped shaft, and the sleeve external thread (1c) is arranged on the outer periphery of the small shaft portion on the right side of the sleeve (1). The shoulder (11) of the sleeve (1) abuts against the inner end surface of the end plate (3).

4. The concrete pile according to claim 1, characterized in that: The thread rotation direction of the internal threaded hole (1b) on the sleeve (1) is opposite to the thread rotation direction of the sleeve external thread (1c) on the sleeve (1).

5. The concrete pile according to claim 1, characterized in that: The pile body (4) is centrifugally formed or vibrationally formed, and the cross section of the pile body (4) is circular, square, H-shaped or special-shaped.

6. The concrete pile according to any one of claims 1 to 5, characterized in that: The end plate (3) is further provided with an end plate threaded hole (3a) or an end plate through hole (3b) which can be used to connect other components.

7. A mechanical pile connection structure, characterized in that: The invention comprises a pile connection member (7) and a connecting member (6) which can be arranged between two adjacent end plates (3) of two concrete piles as described in any one of claims 1 to 5, wherein the connecting member (6) has a connecting portion (61) and a head portion (62), and the outer periphery of the connecting portion (61) is provided with a connecting member external thread (6b) connected to the internal thread hole (1b) of the sleeve; the pile connection member (7) comprises two connecting plates (7a) for respectively connecting to the two adjacent end plates (3) and a connecting rib plate (7b) for fixing the two connecting plates (7a), each of the connecting plates (7a) is provided with a connecting hole (7a1) corresponding to the position of each sleeve (1), and after the connecting member (6) passes through the connecting hole (7a1), the connecting member external thread (6b) can be screwed into the internal thread hole (1b) of the sleeve (1) to fix the connecting plate (7a) and the end plate (3), thereby connecting and fixing the two concrete piles.

8. The mechanical pile connection structure according to claim 7, characterized in that: The connecting piece (6) has an axially penetrating through hole (6a) or a blind hole opening toward the sleeve (1).

9. The mechanical pile connection structure according to claim 8, characterized in that: The head portion (62) is polygonal and has an outer diameter greater than an outer diameter of the connecting portion (61).

10. A mechanical pile connection structure, characterized in that: The invention comprises a pile connection member (7) and a connecting member (6) which can be arranged between two adjacent end plates (3) of two concrete piles as claimed in claim 6, wherein the connecting member (6) has a connecting portion (61) and a head portion (62), and the outer periphery of the connecting portion (61) is provided with a connecting member external thread (6b); the pile connection member (7) comprises two connecting plates (7a) for respectively connecting to the two adjacent end plates (3) and a connecting rib plate (7b) for fixing the two connecting plates (7a); each of the connecting plates (7 a) is provided with a connecting hole (7a1) corresponding to the position of each threaded hole of the end plate, and after the connecting member passes through the connecting hole (7a1), the external thread (6b) of the connecting member can be screwed into the threaded hole (3a) of the end plate for threaded connection, or, each connecting plate (7a) is provided with a connecting hole (7a1) corresponding to the position of each end plate through-hole (3b), and after the connecting member (6) passes through the connecting hole (7a1) and the end plate through-hole (3b), it is threadedly connected to the connecting nut (8) on the back of the end plate (3).

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