Prefabricated concrete component

Abstract

The utility model relates to a concrete prefabricated part which comprises a concrete body, a plurality of steel strands longitudinally arranged in the body, an end plate at the end of the body, a sleeve and a conical clamp with an inner tooth hole, a conical hole is formed in the sleeve, the conical clamp is contained in the conical hole, and the peripheral face of the conical clamp is matched with the conical hole. The periphery of the sleeve is provided with an external thread, and the sleeve is connected into the threaded hole of the end plate through the external thread; the device is characterized in that an opening is formed in the outer side of the conical hole in the sleeve, the steel strand is locked by the conical clamp, and the end of the steel strand axially penetrates through an inner tooth hole of the conical clamp. According to the prefabricated part of the structure, the precision of locking the positions of the steel strands by the conical clamp can be greatly improved, the tensioning force of the steel strands is consistent, the tensioning force of the steel strands can accurately reach a set value, and therefore the overall mechanical property of the prefabricated part is improved.

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 steel strand concrete prefabricated component. Background Art

[0002] Due to the high tensile strength of steel strands (its design tensile strength is 1320MPa, and the maximum tensile strength can reach 1960MPa), in recent years, Chinese enterprises and research institutions have also conducted extensive research on the application of steel strands in precast concrete components. The core technical issues considered are how to achieve the locking of steel strands and end plates and the consistency of tensioning force on each steel strand.

[0003] After investigation, the patent with application number CN201910705392.4 discloses a steel strand clamping component and a concrete pile, in which an anchor ring is threadedly connected to the end plate of the pile body, the inner section of the anchor ring has a tapered hole, and the outer section of the anchor ring has an internal threaded hole. The tapered chuck assembly is placed in the tapered hole of the anchor ring and locks the steel strand. The plug is threadedly installed in the internal threaded hole of the anchor ring to seal the outside of the anchor ring. The end of the steel strand passes through the tapered chuck assembly and is blocked by the plug in order to achieve consistent tensioning length of the steel strand. It adopts the overall tensioning method. However, its defect is that although the steel strand is blocked by the plug, the end of the steel strand will inevitably cause the chuck assembly to be dislocated or deformed due to friction during the insertion of the conical chuck assembly. The position accuracy of the chuck assembly clamping the steel strand end is not high, and it is difficult to ensure that the tensile length of each steel strand is consistent, so that the tensioning force of each steel strand is inconsistent, affecting the overall mechanical properties of the pile body; at the same time, the overall tensioning is only suitable for concrete piles with relatively small tensioning force. If piles with high mechanical properties and large tensioning force are to be produced, the overall tensioning requires a large tensioning machine with hundreds of tons of tensioning force. The tensioning threads and tensioning plates require special materials, which is very inconvenient and dangerous.

[0004] In summary, the aforementioned precast concrete components with steel strands need further improvement. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a concrete prefabricated component with a reasonable structure in response to the deficiencies of the above-mentioned prior art. The prefabricated component with this structure can greatly improve the accuracy of the tapered clamp in locking the steel strand position, so that the tensioning force of each steel strand is consistent, and the tensioning force of each steel strand can accurately reach the set value, thereby improving the overall mechanical properties of the prefabricated component.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a concrete precast component, including a concrete body, a plurality of steel strands arranged longitudinally in the body, an end plate at the end of the body, a sleeve and a conical clamp with an internal tooth hole, the sleeve has a conical hole, the conical clamp is accommodated in the conical hole and its outer circumference matches the conical hole, the outer circumference of the sleeve has an external thread, and the sleeve is connected to the threaded hole of the end plate through its external thread; it is characterized in that the outer side of the conical hole in the sleeve is open, the steel strand is locked by the conical clamp and its end axially passes through the internal tooth hole of the conical clamp.

[0007] To minimize the amount of jamming and resistance the steel strand experiences from the tapered clamp during tensioning, ensuring the strand can be tensioned to the desired value and avoiding damage to the strand and tapered clamp during tensioning, the sleeve further comprises a cavity located at one end of the large hole of the tapered aperture. The outer side of the cavity is open, allowing the tapered clamp to move within the cavity during tensioning. This cavity provides space for the tapered clamp to move within the sleeve, allowing the tapered clamp to move outward from the tapered aperture along with the strand during tensioning, thereby expanding the inner tooth hole of the tapered clamp and facilitating the strand's passage through the inner tooth hole with minimal or no jamming, ultimately achieving the desired tension value.

[0008] Preferably, the end of the steel strand is accommodated in the cavity.

[0009] Preferably, the axial length of the cavity is 6 mm to 10 mm.

[0010] The cross section of the cavity is circular, square, polygonal, or the cavity is an extension of the tapered hole.

[0011] The tapered hole at least partially extends to the outer thread of the sleeve. This will cause at least a portion of the side wall of the tapered hole to be wrapped by the threaded hole of the end plate, thereby increasing the strength of the side wall of the tapered hole.

[0012] The specific selection of the body can be that the body is centrifugally formed or vibrationally formed, and the cross section of the body is circular, square, H-shaped or special-shaped.

[0013] 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.

[0014] For easy installation, the sleeve is in the shape of a stepped shaft, the external thread of the sleeve is arranged on the outer periphery of the small shaft portion of the sleeve, and the shoulder of the sleeve abuts against the inner end surface of the end plate.

[0015] Compared with the existing technology, the advantages of this precast concrete component are: the outer side of the tapered hole on the sleeve is open, so that during production, the steel strand can extend out of the pile end plate and be tensioned individually by the tensioning jack. After the steel strand is tensioned to the set value, the tapered clamp is tightened into the tapered hole by the inner push rod of the tensioning jack, so that the steel strand is accurately locked in the tapered clamp and finally released. Because the tapered clamp does not lock the end of the steel strand, the length and clamping position accuracy of the steel strand are not required to be high, which greatly improves the convenience of production and ensures that the tensioning force of each steel strand is consistent. During the tensioning process of the steel strand, the tapered clamp can move from the tapered hole outward toward the open direction with the steel strand, causing the inner tooth hole of the tapered clamp to expand, so that the steel strand can pass through the inner tooth hole of the tapered clamp with as little or no jamming as possible during the tensioning process, and reach the set tensioning value. Therefore, the structure of the prefabricated component of the present application can ensure both production efficiency and overall mechanical properties of the prefabricated component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a prefabricated concrete component according to an embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of an end portion of a prefabricated concrete component according to an embodiment of the present utility model;

[0018] Figure 3 This is a three-dimensional schematic diagram of a sleeve in an embodiment of the present utility model;

[0019] Figure 4 This is a cross-sectional view of a sleeve in an embodiment of the present utility model;

[0020] Figure 5 Schematic diagram of the three-dimensional structure of the conical clamp in the concrete pile embodiment;

[0021] Figure 6 It is a three-dimensional exploded view of the conical clamp in the concrete pile embodiment. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 6 FIG. 1 shows a preferred embodiment of a precast concrete component.

[0024] A precast concrete component includes a concrete body 1, steel strands 4 arranged longitudinally within the body 1, an end plate 2 at the end of the body, a sleeve 3, and a tapered fixture 5 with an internal tooth hole 51. The body 1 can be centrifugally formed or vibration-formed, and the cross-section of the body 1 can be circular, square, H-shaped, or irregular. Figure 1In this example, a vibration-formed precast concrete pile with an H-shaped cross section is used. The sleeve 3 has a tapered hole 3a therein, and the tapered fixture 5 can be placed in the tapered hole 3a, with its outer circumference matching the tapered hole 3a. The sleeve 3 has external threads 3b on its outer circumference, and the sleeve 3 is connected to the threaded hole 2a of the end plate 2 via these external threads 3b.

[0025] like Figure 5 、 6 As shown, the tapered clamp 5 is composed of two or more clamps spliced ​​together, and the inner wall of each clamp is formed with a latching tooth 52. The outer peripheral surface of the tapered clamp 5 forms a cone surface 53 that matches the tapered hole 3a.

[0026] The outer side of the tapered hole 3a on the sleeve 3 is open, and the end of the steel strand 4 axially passes through the inner tooth hole 51 of the tapered clamp 5 placed in the tapered hole 3a and passes out of the tapered hole 3a. The steel strand 4 can be locked by the inner tooth hole 51 of the tapered clamp 5.

[0027] The sleeve 3 also has a cavity 3c located at the large end of the tapered hole 3a. The outside of the cavity 3c is open, and the tapered clamp 5 can move within the cavity 3c during the tensioning process of the steel strand 4. The end of the steel strand 4 is accommodated in the cavity 3c. The axial length of the cavity 3c is 6mm to 10mm. The cross-section of the cavity 3c can be circular, square, or polygonal. Figure 3 、 Figure 4 Cavity 3c has a circular cross-section. Alternatively, cavity 3c can be an extension of tapered hole 3a, meaning that cavity 3c also has a taper, which facilitates simultaneous machining and forming with the tapered hole. The purpose of this invention can be achieved by leaving the inner wall of cavity 3c free of internal threads, thereby simplifying the machining and production process and saving costs.

[0028] The tapered hole 3a at least partially extends to the range of the external thread 3b of the sleeve 3, thereby enhancing the side wall strength of the tapered hole and preventing the side wall of the tapered hole from being pulled apart.

[0029] The right end of the sleeve 3 is flush with or lower than the outer end surface of the end plate 2. The sleeve 3 is in the shape of a stepped shaft, and the outer thread 3b of the sleeve 3 is set on the outer periphery of the small shaft part on the right side of the sleeve 3. The shoulder 31 of the sleeve 3 abuts against the inner end surface of the end plate 2.

[0030] The left and right directions in this application are based on the directions shown in the figure. If the end plate 2 is at the other end, the left and right directions are just the opposite, that is, in use, the side close to the outer end surface of the end plate 2 is the right, and the side close to the inner end surface of the end plate 2 is the left. The outside is relative to the inside of the prefabricated component body 1. Figure 2 The mediolateral side is the side facing the endplate

[0031] The concrete component of this structure allows the steel strand to extend out of the main body 1 so that each steel bar can be tensioned individually during production, thereby ensuring both production efficiency and the overall mechanical properties of the prefabricated component; in the process of tensioning the steel strand 4, the conical clamp can move the conical clamp 5 from the conical hole 3a to the open direction along with the steel strand 4, which can expand the inner tooth hole 51 of the conical clamp 5, making it easier for the steel strand 4 to pass through the inner tooth hole 51 with as little or no jamming as possible and reach the set tensioning value.

[0032] 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 precast concrete component, comprising a concrete body (1), a plurality of steel strands (4) arranged longitudinally in the body (1), an end plate (2) at the end of the body, a sleeve (3), and a tapered fixture (5) having an internal tooth hole (51), wherein the sleeve (3) has a tapered hole (3a), the tapered fixture (5) is accommodated in the tapered hole (3a) and its outer peripheral surface matches the tapered hole (3a), the outer periphery of the sleeve (3) has an external thread (3b), and the sleeve (3) is connected to the threaded hole (2a) of the end plate (2) through the external thread (3b); characterized in that: The outer side of the tapered hole (3a) in the sleeve (3) is open, the steel strand (4) is locked by the tapered clamp (5) and its end axially passes through the inner tooth hole (51) of the tapered clamp (5).

2. The precast concrete component according to claim 1, characterized in that: The sleeve (3) also has a cavity (3c) located at one end of the large hole of the tapered hole (3a), the outer side of the cavity (3c) is open, and the tapered clamp (5) can move in the cavity (3c) during the process of tensioning the steel strand (4).

3. The precast concrete component according to claim 2, characterized in that: The end of the steel strand (4) is accommodated in the cavity (3c).

4. The precast concrete component according to claim 2, characterized in that: The axial length of the cavity (3c) is 6 mm to 10 mm.

5. The precast concrete component according to any one of claims 2 to 4, characterized in that: The cross section of the cavity (3c) is circular, square, or polygonal, or the cavity (3c) is an extension of the tapered hole (3a).

6. The precast concrete component according to claim 1, characterized in that: The tapered hole (3a) at least partially extends into the range of the external thread (3b) of the sleeve (3).

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

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

9. The precast concrete component according to claim 8, characterized in that: The sleeve (3) is in the shape of a stepped shaft, the external thread (3b) of the sleeve (3) is arranged on the outer periphery of the small shaft portion of the sleeve (3), and the shoulder (31) of the sleeve (3) abuts against the inner end surface of the end plate (2).

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