A non-synchronous tensioning device and method for hybrid reinforced concrete pipe pile

Abstract

The present application relates to a kind of mixed reinforcement concrete pipe pile non-synchronous tensioning device and tensioning method, including driving device, fixed end component, tensioning end component and connecting plate, fixed end component includes guide rail, first inner and outer end plate, stop piece, tensioning end component includes second inner and outer end plate, by the end of various reinforcements is punted, and large hole end is passed through corresponding end plate, and is slid into small hole end, the stop cooperation of two ends is realized, then the first inner end plate of fixed end is stopped, the second inner and outer end plate are moved, so that the prestressed steel bar of stop cooperation with inner end plate is first tensioned, when first outer end plate and first inner end plate contact, hot-rolled threaded steel bar is tensioned, the tensioning of the reinforcement of two prestress requirements is realized simultaneously but not synchronously, and the tensioning of multiple reinforcements of two prestress requirements is realized once.

Description

Technical Field

[0001] This invention relates to a non-synchronous tensioning device and tensioning method for mixed reinforced concrete pipe piles. Background Technology

[0002] Prestressed concrete pipe piles have advantages such as meeting environmental protection requirements, reliable pile quality, fast construction speed, high efficiency, short construction period, and good bending and crack resistance. They are currently widely used in highways, bridges, ports, docks, and industrial and civil buildings.

[0003] However, the existing tensioning method for prestressed concrete pipe piles is relatively crude, only one steel bar can be tensioned at a time, which is inefficient and cannot tension multiple steel bars with different prestress requirements at the same time, thus limiting its application.

[0004] For mixed reinforced concrete pipe piles, multiple prestressed steel bars with different prestress requirements are involved. If the traditional method is used, it is not only time-consuming and labor-intensive and cannot meet the tensioning requirements, but also it is difficult to ensure the same prestress requirements for the same type of steel bars when tensioning them one by one, which affects the bearing capacity of the pipe pile.

[0005] Therefore, there is an urgent need for a new technology that is low in cost, simple in structure, practical, and, more importantly, can efficiently achieve one-time tensioning of mixed reinforced concrete pipe piles while ensuring tensioning quality. Summary of the Invention

[0006] The purpose of this invention is to provide a low-cost, simple, and practical non-synchronous tensioning device for mixed-reinforced concrete pipe piles that can efficiently achieve one-time tensioning of mixed-reinforced concrete pipe piles and ensure tensioning quality. The purpose of this invention is also to provide a non-synchronous tensioning method for mixed-reinforced concrete pipe piles using the aforementioned non-synchronous tensioning device.

[0007] The technical solution of the asynchronous tensioning device for hybrid reinforced concrete pipe piles of the present invention is as follows: The asynchronous tensioning device for hybrid reinforced concrete pipe piles includes: The drive mechanism includes a telescopic rod that can extend and retract. The fixed end assembly includes a guide rail and a first inner end plate and a first outer end plate that move freely along the guide rail under its guidance. The guide rail has a stop for limiting the movement of the first inner end plate toward the tensioning direction. The tensioning end assembly includes a second inner end plate and a second outer end plate; The first and second inner end plates are provided with multiple inner egg-shaped holes for prestressed steel bars to pass through and multiple inner steel bar through holes for hot-rolled threaded steel bars to pass through. The inner egg-shaped holes and inner steel bar through holes are arranged alternately on the same circumference. The diameter of the large end of the inner egg-shaped hole is larger than the outer diameter of the prestressed steel bar head. The diameter of the small end of the inner egg-shaped hole is between the outer diameter of the prestressed steel bar and the outer diameter of its head so that the head can slide from the large end to the small end and be stopped. The first and second outer end plates are provided with multiple outer egg-shaped holes for hot-rolled threaded steel bars to pass through. The outer egg-shaped holes are set one-to-one with the inner steel bar through holes. The diameter of the large end of the outer egg-shaped hole is larger than the outer diameter of the hot-rolled threaded steel bar head. The diameter of the small end of the outer egg-shaped hole is between the outer diameter of the hot-rolled threaded steel bar and the outer diameter of its head so that the head can slide from the large end to the small end and be stopped. The connecting plate is fixedly connected to the telescopic rod on one side and connected to the second inner and outer end plates on the other side by connecting bolts; During use, the ends of each prestressed steel bar are blocked on the small holes of the inner egg-shaped holes of the first and second inner end plates, respectively, and the ends of each hot-rolled threaded steel bar are blocked on the small holes of the outer egg-shaped holes of the first and second outer end plates, respectively. The telescopic rod of the drive device drives the second inner and outer end plates to tension through the connecting plate, so that each prestressed steel bar is tensioned first, and each hot-rolled threaded steel bar is tensioned when the first outer end plate contacts the first inner end plate.

[0008] Furthermore, the guide rail is semi-circular and has multiple locating pin holes spaced apart along the axial direction on its inner circumferential surface. The stop is selectively fixed to the locating pin holes by locating pins.

[0009] Furthermore, the guide rail constitutes the lower mold for pouring mixed reinforced concrete pipe piles, and the edge of the guide rail is provided with a flange for detachable connection with the semi-circular upper mold.

[0010] Furthermore, both the inner and outer egg-shaped holes include a large hole, a small hole, and a connecting hole connecting the large hole and the small hole, with the width of the connecting hole being the same as the diameter of the small hole.

[0011] The technical solution of the non-synchronous tensioning method for hybrid reinforced concrete pipe piles of the present invention is as follows: The non-synchronous tensioning method for hybrid reinforced concrete pipe piles includes: The lengths of the prestressed steel bars and hot-rolled threaded steel bars are calculated based on the prestress requirements that each reinforcement of the mixed reinforced concrete pipe pile needs to meet. The length of the hot-rolled threaded steel bars is greater than the length of the prestressed steel bars. According to the calculation, the ends of the prestressed steel bars and hot-rolled threaded steel bars are processed by the steel bar end-forming machine. Pass both ends of each hot-rolled threaded steel bar through the inner steel bar through holes in the first and second inner end plates respectively, and then pass the uphead through the large end of the outer egg-shaped hole in the first and second outer end plates respectively, and then slide it to the small end of the outer egg-shaped hole. The abutments at both ends of each prestressed steel bar pass through the large end of the inner egg-shaped hole in the first and second inner end plates, and then slide to the small end of the inner egg-shaped hole. The connecting plate is connected and fixed to the second inner and outer end plates of the tension breaking assembly by connecting bolts. The first inner and outer end plates are placed on the guide rail to ensure that the first inner and outer end plates can move along the guide rail. The displacement of the first inner end plate in the tensioning direction is restricted by the stop, and the connecting plate is moved away from the guide rail by the telescopic rod of the drive device, so that the prestressed steel bar is tensioned first, until the first outer end plate moves along the guide rail and is stopped by the first inner end plate, at which point the hot-rolled threaded steel bar begins to be tensioned.

[0012] Furthermore, stirrups are placed around the periphery of each prestressed steel bar and hot-rolled threaded steel bar, and tied with wire to form the steel reinforcement skeleton of the mixed reinforced concrete pipe pile.

[0013] Furthermore, the guide rail is configured as a semi-circular tube, and a plurality of locating pin holes spaced apart along the axial direction are provided on the inner circumferential surface of the guide rail. The stop member is selectively fixed to the locating pin holes by locating pins.

[0014] Furthermore, the guide rail constitutes the lower mold for pouring mixed reinforced concrete pipe piles. The edge of the guide rail is provided with a flange for detachable connection with the semi-circular upper mold. After connecting the upper mold, concrete pipe piles can be poured directly.

[0015] The beneficial effects of the present invention are as follows: The present invention has at least the following advantages: (1) The device and method can realize the tensioning of various prestressed reinforcements of mixed reinforced concrete pipe piles in one go. Compared with the prior art, the tensioning efficiency is high, the operation is simple and convenient, and the labor is saved; (2) It can ensure the stability of tensioning quality. Compared with the existing single-strand tensioning method, its one-time tensioning method ensures that the stress and deformation of each type of prestressed steel bar are basically the same, thereby providing basically uniform prestressed steel bars in the circumferential direction, and thus ensuring that the pipe pile can have stable bearing performance; (3) The device uses fewer parts and they are all easy to obtain. The device is easy to process and can be directly processed and modified with materials on site. It is relatively convenient and the cost is relatively low, which is easy to be accepted by customers; Furthermore, the guide rail is not only used to guide the first inner and outer end plates, but also as the lower mold for the concrete pouring of the pipe pile. Attached Figure Description

[0016] Figure 1This is a structural schematic diagram of an embodiment of a non-synchronous tensioning device for a hybrid reinforced concrete pipe pile according to the present invention (the connecting bolts, prestressed steel bars and hot-rolled threaded steel bars are arranged in a staggered manner in the figure for easy illustration; in reality, the three are on the same circumference). Figure 2 This is the front view of the first and second outer end plates; Figure 3 This is a front view of the first and second inner end plates; In the diagram: 1-Telescopic rod, 2-Connecting plate, 3-Connecting bolt, 4-Second outer end plate, 5-Second inner end plate, 6-Prestressed steel bar, 7-Hot-rolled threaded steel bar, 8-Stirrup, 9-Guide rail, 10-Stop, 11-First inner end plate, 12-First outer end plate, 13-Head, 14-Inner steel bar through hole, 15-Inner oval hole, 16-Outer oval hole, 17-Large hole, 18-Small hole, 19-Connecting hole, 20-Center hole, 21-Hydraulic cylinder. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0021] An embodiment of the asynchronous tensioning device for hybrid reinforced concrete pipe piles according to the present invention: The asynchronous tensioning device for hybrid reinforced concrete pipe piles includes: The driving device includes a hydraulic cylinder 21 and a telescopic rod 1 that can extend and retract. In other embodiments, other linear reciprocating motion devices with greater driving force may also be used. The fixed-end assembly includes a guide rail 9 and a first inner end plate 11 and a first outer end plate 12 that move freely along the guide rail 9 under its guidance. The guide rail 9 has a stop 10 for restricting the movement of the first inner end plate 11 in the tensioning direction. The guide rail 9 is a semi-circular tubular structure made of steel. The structures of the first inner end plate 11 and the first outer end plate 12 are shown below. Figure 2 , 3 As shown. The stop 10 has a semi-circular tubular structure, and its outer circumferential surface has the same diameter as the inner circumferential surface of the guide rail for complete fit. Multiple pin holes are evenly distributed on the guide rail, and multiple pin holes are also provided on the stop 10. The stop 10 is locked relative to the guide rail by the pins.

[0022] The tensioning end assembly includes a second inner end plate 5 and a second outer end plate 4; the structure of the second inner end plate 5 is exactly the same as the structure of the first inner end plate 11, and the structure of the second outer end plate 4 is the same as the structure of the first outer end plate 12.

[0023] The first and second inner end plates and the first and second outer end plates are all thick circular steel plates with a central hole 20 in the middle.

[0024] like Figure 3 As shown, the first and second inner end plates are provided with multiple inner egg-shaped holes 15 for prestressed steel bars 6 to pass through and multiple inner steel bar through holes 14 for hot-rolled threaded steel bars 7 to pass through. The inner egg-shaped holes 15 and inner steel bar through holes 14 are arranged alternately on the same circumference. The diameter of the large hole 17 end of the inner egg-shaped hole 15 is larger than the outer diameter of the pier head 13 of the prestressed steel bar 6. The diameter of the small hole 18 end of the inner egg-shaped hole 15 is between the outer diameter of the prestressed steel bar 6 and the outer diameter of its pier head 13 so that the pier head 13 can slide from the large hole 17 end to the small hole 18 end to be stopped. The inner egg-shaped hole 15 includes a large hole 17, a small hole 18 and a connecting hole 19. The diameter of the large hole 17 is slightly larger than the diameter of the pier head 13 so that the pier head 13 can pass through. The diameter of the small hole 18 and the width of the connecting hole 19 are slightly larger than the diameter of the corresponding steel bar and smaller than the diameter of the pier head 13 so that the pier head 13 can slide to the small hole 18 and be stopped by the hole edge of the small hole 18.

[0025] like Figure 2As shown, the first and second outer end plates are provided with multiple oval holes 16 for hot-rolled threaded steel bars 7 to pass through. The oval holes 16 correspond one-to-one with the inner steel bar through holes 14. The diameter of the large hole 17 end of the oval hole 16 is larger than the outer diameter of the head 13 of the hot-rolled threaded steel bar 7, and the diameter of the small hole 18 end of the oval hole 16 is between the outer diameter of the hot-rolled threaded steel bar 7 and the outer diameter of its head 13, so that the head 13 can slide from the large hole 17 end to the small hole 18 end and be stopped. Among them, some of the inner steel bar through holes 14 and the corresponding oval holes 16 are reserved, for example, eight circumferentially distributed holes are reserved as connecting holes 19 for later use of connecting bolts 3 to connect the connecting plate 2, the first inner end plate 11, and the first outer end plate 12. That is, some evenly distributed holes are reserved in the first inner and outer end plates for use when connecting bolts 3 are connected. Overall, all the connecting bolts 3 are evenly distributed in the circumferential direction, all the prestressed steel plates are evenly distributed in the circumferential direction, and all the hot-rolled threaded steel bars 7 are evenly distributed in the circumferential direction.

[0026] The connecting plate 2 is fixedly connected to the telescopic rod 1 on one side and connected to the second inner and outer end plates on the other side by connecting bolts 3. The connecting plate 2 is a circular thick steel plate, and connecting holes 19 for mounting connecting bolts 3 are provided on it corresponding to the reserved inner steel bar through holes 14.

[0027] The guide rail 9 is semi-circular and tubular. Multiple locating pin holes are spaced apart axially on the inner circumferential surface of the guide rail 9. The stop member 10 is selectively fixed to the locating pin holes by locating pins. The guide rail 9 constitutes the lower mold for pouring mixed reinforced concrete pipe piles. The edge of the guide rail 9 is provided with a flange for detachable connection to the semi-circular tubular upper mold. Both the inner and outer egg-shaped holes 16 include a large hole 17, a small hole 18, and a connecting hole 19 connecting the large hole 17 and the small hole 18. The width of the connecting hole 19 is the same as the diameter of the small hole 18.

[0028] During use, the ends 13 of each prestressed steel bar 6 are blocked on the small holes 18 of the inner egg-shaped holes 15 of the first and second inner end plates, and the ends 13 of each hot-rolled threaded steel bar 7 are blocked on the small holes 18 of the outer egg-shaped holes 16 of the first and second outer end plates. The telescopic rod 1 of the drive device drives the second inner and outer end plates to tension through the connecting plate 2, so that each prestressed steel bar 6 is tensioned first, and each hot-rolled threaded steel bar 7 is tensioned when the first outer end plate 12 contacts the first inner end plate 11.

[0029] An embodiment of the asynchronous tensioning method for hybrid reinforced concrete pipe piles according to the present invention: The asynchronous tensioning method for hybrid reinforced concrete pipe piles includes the following steps, the steps of which are not strictly in the order of appearance: The lengths of the prestressed steel bars and hot-rolled threaded steel bars are calculated based on the prestress requirements that each reinforcement of the mixed reinforced concrete pipe pile needs to meet. The length of the hot-rolled threaded steel bars is greater than the length of the prestressed steel bars. According to the calculation, the ends of the prestressed steel bars and hot-rolled threaded steel bars are processed by the steel bar end-forming machine. Pass both ends of each hot-rolled threaded steel bar through the inner steel bar through holes in the first and second inner end plates respectively, and then pass the uphead through the large end of the outer egg-shaped hole in the first and second outer end plates respectively, and then slide it to the small end of the outer egg-shaped hole. The abutments at both ends of each prestressed steel bar pass through the large end of the inner egg-shaped hole in the first and second inner end plates, and then slide to the small end of the inner egg-shaped hole. The connecting plate is connected and fixed to the second inner and outer end plates of the tension breaking assembly by connecting bolts. The first inner and outer end plates are placed on the guide rail to ensure that the first inner and outer end plates can move along the guide rail. The displacement of the first inner end plate in the tensioning direction is restricted by the stop, and the connecting plate is moved away from the guide rail by the telescopic rod of the drive device, so that the prestressed steel bar is tensioned first, until the first outer end plate moves along the guide rail and is stopped by the first inner end plate, at which point the hot-rolled threaded steel bar begins to be tensioned.

[0030] Stirrups are wrapped around the periphery of each prestressed steel bar and hot-rolled threaded steel bar, and tied with wire to form a steel reinforcement skeleton for the mixed reinforced concrete pipe pile.

[0031] The guide rail is configured as a semi-circular tube, and a plurality of locating pin holes are provided on the inner circumferential surface of the guide rail at intervals along the axial direction. The stop is selectively fixed to the locating pin holes by locating pins.

[0032] The guide rail forms the lower mold for pouring mixed reinforced concrete pipe piles. The edge of the guide rail is provided with a flange for detachable connection with the semi-circular upper mold. After connecting the upper mold, concrete pipe piles can be poured directly.

[0033] This invention can achieve tensioning of various prestressed reinforcements in mixed-reinforced concrete pipe piles in one operation. Compared with existing technologies, it has high tensioning efficiency, simple and convenient operation, and saves labor. It can ensure stable tensioning quality. Compared with the existing single-strand tensioning method, its one-time tensioning method ensures that the stress and deformation of each type of prestressed steel bar are basically the same, thereby providing basically uniform prestressed steel bars in the circumferential direction, and thus ensuring that the pipe pile can have stable bearing performance. The device uses fewer parts, and they are all easily obtained components. The device is easy to process and can be directly processed and modified with on-site materials, which is convenient, low-cost, and easily accepted by customers. Furthermore, the guide rail is not only used to guide the first inner and outer end plates, but also serves as the lower mold for the concrete pouring of the pipe pile.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A non-synchronous tensioning device for mixed-reinforced concrete pipe piles, characterized in that, include: The drive mechanism includes a telescopic rod that can extend and retract; The fixed end assembly includes a guide rail and a first inner end plate and a first outer end plate that move freely along the guide rail under its guidance. The guide rail has a stop for limiting the movement of the first inner end plate toward the tensioning direction. The tensioning end assembly includes a second inner end plate and a second outer end plate; The first and second inner end plates are provided with multiple inner egg-shaped holes for prestressed steel bars to pass through and multiple inner steel bar through holes for hot-rolled threaded steel bars to pass through. The inner egg-shaped holes and inner steel bar through holes are arranged alternately on the same circumference. The diameter of the large end of the inner egg-shaped hole is larger than the outer diameter of the prestressed steel bar head. The diameter of the small end of the inner egg-shaped hole is between the outer diameter of the prestressed steel bar and the outer diameter of its head so that the head can slide from the large end to the small end and be stopped. The first and second outer end plates are provided with multiple outer egg-shaped holes for hot-rolled threaded steel bars to pass through. The outer egg-shaped holes are set one-to-one with the inner steel bar through holes. The diameter of the large end of the outer egg-shaped hole is larger than the outer diameter of the hot-rolled threaded steel bar head. The diameter of the small end of the outer egg-shaped hole is between the outer diameter of the hot-rolled threaded steel bar and the outer diameter of its head so that the head can slide from the large end to the small end and be stopped. The connecting plate is fixedly connected to the telescopic rod on one side and connected to the second inner and outer end plates on the other side by connecting bolts; During use, the ends of each prestressed steel bar are blocked on the small holes of the inner egg-shaped holes of the first and second inner end plates, respectively, and the ends of each hot-rolled threaded steel bar are blocked on the small holes of the outer egg-shaped holes of the first and second outer end plates, respectively. The telescopic rod of the drive device drives the second inner and outer end plates to tension through the connecting plate, so that each prestressed steel bar is tensioned first, and each hot-rolled threaded steel bar is tensioned when the first outer end plate contacts the first inner end plate.

2. The asynchronous tensioning device for mixed-reinforced concrete pipe piles according to claim 1, characterized in that, The guide rail is semi-circular and has multiple locating pin holes spaced apart along the axial direction on its inner circumferential surface. The stop is selectively fixed to the locating pin holes by locating pins.

3. The asynchronous tensioning device for mixed-reinforced concrete pipe piles according to claim 2, characterized in that, The guide rail forms the lower mold for pouring mixed reinforced concrete pipe piles, and the edge of the guide rail is provided with a flange for detachable connection with the semi-circular upper mold.

4. The asynchronous tensioning device for mixed-reinforced concrete pipe piles according to claim 1, characterized in that, Both the inner and outer egg-shaped holes include a large hole, a small hole, and a connecting hole that connects the large hole and the small hole. The width of the connecting hole is the same as the diameter of the small hole.

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