Self-resetting prefabricated assembled bridge pier and construction method thereof

Abstract

The present invention relates to the technical field of bridge engineering, and discloses a self-resetting prefabricated assembled bridge pier and a construction method thereof, wherein the self-resetting prefabricated assembled bridge pier comprises a prefabricated pier column and a foundation pedestal, and also comprises a first prestressed tendon and an energy-absorbing connector; the bottom of the prefabricated pier column and the foundation pedestal are connected to form a whole through the first prestressed tendon and the energy-absorbing connector respectively. The present invention has a simple structure, convenient operation, and high construction efficiency. The assembled bridge pier after construction has self-resetting property and good anti-overturning property, and effectively solves the problem that the corner of the existing assembled bridge pier is easily damaged and broken due to stress concentration, and is easy to repair the damaged part.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a self-resetting prefabricated assembled bridge pier and a construction method thereof. Background Art

[0002] In recent years, transportation infrastructure, especially high-speed railways, highways and urban expressways, has developed rapidly, among which bridge engineering occupies a pivotal position. The huge construction demand has put forward higher requirements on the construction quality and efficiency of bridge engineering. The prefabricated and assembled bridge structure can significantly improve the construction efficiency and ensure the construction quality with its standardized and modular construction method. It also has the advantages of less interference with existing traffic, green and environmental protection, etc., so it has been widely promoted and applied, and is very suitable for the construction of bridge engineering.

[0003] At present, in the application of prefabricated assembled bridges, the research and application practice of prefabricated assembled piers on the lower side of the bridge is still in its infancy, and its application is mainly concentrated in cross-river and cross-sea bridges and urban bridges in low-intensity earthquake fortification areas.

[0004] However, for high-intensity earthquake fortification areas, the existing assembled piers have poor anti-overturning performance. Due to the existence of the splicing structural joints between the pier body and the abutment, the lateral restraint of the prefabricated assembled piers is weak, and lateral slippage is prone to occur under the action of an earthquake. This also causes the pier corners to be damaged and broken due to stress concentration. Compared with cast-in-place integral piers, their seismic performance is obviously insufficient, and they are more susceptible to damage in an earthquake. Once damaged, they are extremely difficult to repair. Summary of the invention

[0005] The embodiment of the present invention provides a self-resetting prefabricated assembled bridge pier and a construction method thereof, which are used to solve the problems that the existing assembled bridge piers have poor anti-overturning performance and the pier corners are easily damaged and broken due to stress concentration.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a self-resetting prefabricated assembled bridge pier, including a prefabricated pier column and a foundation pedestal, and also includes: a first prestressed tendon and an energy-absorbing connecting piece; the bottom of the prefabricated pier column and the foundation pedestal are respectively connected to form a whole through the first prestressed tendon and the energy-absorbing connecting piece.

[0007] Wherein, the prefabricated pier comprises a plurality of columns, a carrying structure is arranged on the upper side of the prefabricated pier, and the top of the prefabricated pier and the carrying structure are respectively connected to form a whole through the first prestressed tendons and the energy-absorbing connecting parts; and / or, the prefabricated pier is provided with second prestressed tendons arranged along the long side direction thereof, and the prefabricated pier comprises a plurality of prefabricated segments.

[0008] Among them, one end of the first prestressed tendon is anchored on the prefabricated pier, and the other end passes through the foundation pedestal and is anchored on the side of the foundation pedestal, or both ends of the first prestressed tendon are anchored on the prefabricated pier, and at least a section of the middle part of the first prestressed tendon is located in the foundation pedestal.

[0009] Among them, a foot seat is provided at the bottom of the prefabricated pier, and the foot seat is connected to the foundation pedestal through a plurality of energy-absorbing connecting parts, and the plurality of energy-absorbing connecting parts are centrally symmetrically distributed along the vertical center line of the prefabricated pier; both ends of the first prestressed tendon are anchored on the upper surface of the foot seat, and the middle part of the first prestressed tendon is located in the foundation pedestal.

[0010] Among them, it also includes: a first pre-buried pipe; the first pre-buried pipe includes a first straight segment, a U-shaped segment and a second straight segment, the first straight segment and the second straight segment are pre-buried in the base, the U-shaped segment is pre-buried in the foundation pedestal and the two ends of the U-shaped segment are located on the upper surface of the foundation pedestal, the upper ends of the first straight segment and the second straight segment are both located on the upper surface of the base, the lower ends of the first straight segment and the second straight segment are both located on the lower surface of the base and correspond to the two ends of the U-shaped segment respectively; the first prestressed tendon is an unbonded prestressed tendon, the first prestressed tendon passes through the first pre-buried pipe, and the two ends of the first prestressed tendon extend from the two ends of the first pre-buried pipe and are anchored on the upper surface of the base.

[0011] Among them, it also includes: a second embedded pipe arranged along the long side direction of the prefabricated pier; the second embedded pipe is embedded in the prefabricated pier in an integrated manner, or the second embedded pipe includes a plurality of segments, and is respectively embedded in each of the prefabricated segments; the second prestressed tendons are bonded prestressed tendons, the second prestressed tendons pass through the second embedded pipe, and cement mortar is filled between the second prestressed tendons and the second embedded pipe.

[0012] Wherein, the energy-absorbing connecting member comprises an energy-absorbing rod, which is arranged vertically, and the upper end of the energy-absorbing rod is connected to the foot seat, and the lower end of the energy-absorbing rod is connected to the foundation support.

[0013] Among them, it also includes: a fixed pad, a third embedded pipe and an anchor; the fixed pad is embedded in the upper surface of the base, the third embedded pipe is vertically embedded in the base, and the anchor is embedded in the foundation pedestal; the diameter of the energy-absorbing rod is smaller than the inner diameter of the third embedded pipe, and the energy-absorbing rod is inserted into the third embedded pipe, the upper end of the energy-absorbing rod is connected to the fixed pad, and the lower end of the energy-absorbing rod is threadedly connected to the anchor.

[0014] Wherein, a threaded groove is provided on the fixing pad, and the threaded groove is threadedly connected to the brim of the fixing cap, and the upper end of the energy dissipation rod extends from the upper side of the fixing pad and abuts against the top of the fixing cap.

[0015] On the other hand, an embodiment of the present invention further provides a construction method for the self-resetting prefabricated assembled pier as described above, comprising: S1, preparing a prefabricated pier column and a foundation pedestal; S2, hoisting the prefabricated pier column on the foundation pedestal, ensuring that the first straight section and the second straight section of the first pre-buried pipe correspond to the two ends of its U-shaped section respectively, and ensuring that the lower end of the third pre-buried pipe corresponds to the anchor piece; S3, inserting the first prestressed tendon into the first pre-buried pipe, the two ends of the first prestressed tendon extend from the two ends of the first pre-buried pipe and are anchored on the fixed pad, and inserting the energy-absorbing rod into the third pre-buried pipe, the lower end of the energy-absorbing rod is threadedly connected to the anchor piece, and the upper end of the energy-absorbing rod is fastened to the fixed pad.

[0016] Wherein, S2 further comprises: inserting the second prestressed tendon into the second pre-buried pipe of the prefabricated segment at the bottom of the prefabricated pier column, anchoring the lower end of the second prestressed tendon, and then hoisting the prefabricated segment on the foundation cap;

[0017] S3 further includes: installing other prefabricated sections of the prefabricated pier column upward layer by layer in sequence, injecting cement mortar into the second embedded pipe after the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, and anchoring the upper end of the second prestressed tendon to the top of the prefabricated pier column.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0019] The self-resetting prefabricated assembled bridge pier provided in the embodiment of the present invention connects the bottom of the prefabricated pier column with the foundation pedestal as a whole through the first prestressed tendon, so that when the prefabricated pier column moves laterally or swings under the action of an earthquake, the corresponding prestress can be applied to the bottom of the prefabricated pier column, so that the prefabricated pier column can quickly self-reset to the initial position, thereby greatly reducing the residual deformation of the corresponding structural parts of the prefabricated pier column and having good anti-overturning ability; at the same time, the connection ability and energy dissipation ability between the bottom of the prefabricated pier column and the foundation pedestal are further provided through the energy-absorbing connecting piece, effectively preventing the pier corner part of the prefabricated pier column from being damaged and broken due to stress concentration, correspondingly reducing the stress loss caused by local squeezing of the concrete structure at the bottom of the prefabricated pier column, and being conducive to supporting the prefabricated pier column to swing with a larger rotation radius under the cooperation of the first prestressed tendon, thereby enhancing the anti-overturning ability of the assembled bridge pier.

[0020] The construction method based on the self-resetting prefabricated assembled bridge pier provided by the present invention only requires the preparation of prefabricated pier columns and foundation caps in advance during construction, and then the hoisting of the prefabricated pier columns on the foundation caps at the construction site, and finally the installation of the first prestressed tendons and energy-consuming connectors. The entire construction process is convenient to operate, with high construction efficiency, and the assembled bridge piers after construction have self-resetting properties and good anti-overturning properties, which effectively solves the problem that the corners of the existing assembled bridge piers are easily damaged and broken due to stress concentration, and it is easy to repair the damaged parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the main structure of the first structure of the self-resetting prefabricated assembled bridge pier shown in an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the main structure of the second structure of the self-resetting prefabricated assembled bridge pier shown in an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the main structure of the third structure of the self-resetting prefabricated assembled bridge pier shown in the embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of a partial structure in which a footrest and a foundation cap are connected through a first prestressed tendon and an energy-absorbing connector respectively as shown in an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the top view of the fixed pad shown in an embodiment of the present invention;

[0027] Figure 6 It is a bottom view structural schematic diagram of the fixed pad shown in an embodiment of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the matching of the fixed pad and the embedded bolts when the fixed pad is embedded on the upper surface of the foot seat according to an embodiment of the present invention;

[0029] Figure 8 It is a flow chart of a construction method based on self-resetting prefabricated assembled bridge piers shown in an embodiment of the present invention;

[0030] Fig. 9 The present invention is a flowchart of a specific construction process of a self-resetting prefabricated assembled bridge pier shown in an embodiment of the present invention.

[0031] In the figure: 1. prefabricated pier; 2. foundation cap; 3. first prestressed tendon; 4. second prestressed tendon; 5. first embedded pipe; 6. second embedded pipe; 7. prefabricated cap beam; 8. foot seat; 9. energy-absorbing connector; 91. energy-absorbing rod; 92. fixed pad; 921. first through hole; 922. first threaded countersunk groove; 923. threaded countersunk hole; 924. second through hole; 925. second threaded countersunk groove; 93. embedded bolt; 94. third embedded pipe; 95. embedded joint; 96. anchor head; 97. locking nut; 98. first fixing cap; 99. second fixing cap. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1 to Figure 2 This embodiment provides a self-resetting prefabricated assembled bridge pier, including a prefabricated pier column 1 and a foundation pedestal 2, and also includes a first prestressed tendon 3 and an energy-absorbing connector 9; the bottom of the prefabricated pier column 1 and the foundation pedestal 2 are connected to form a whole through the first prestressed tendon 3 and the energy-absorbing connector 9 respectively.

[0035] Specifically, the self-resetting prefabricated assembled pier shown in this embodiment connects the bottom of the prefabricated pier column 1 and the foundation pedestal 2 as a whole through the first prestressed tendon 3, so that when the prefabricated pier column 1 moves laterally or swings under the action of an earthquake, a corresponding prestress can be applied to the bottom of the prefabricated pier column 1, so that the prefabricated pier column 1 can quickly self-reset to the initial position, thereby greatly reducing the residual deformation of the corresponding structural parts of the prefabricated pier column 1 and having good anti-overturning ability; at the same time, the energy-absorbing connector 9 further provides the connection ability and energy-absorbing ability between the bottom of the prefabricated pier column 1 and the foundation pedestal 2, effectively preventing the pier corner of the prefabricated pier column 1 from being damaged and broken due to stress concentration, correspondingly reducing the stress loss caused by local extrusion of the concrete structure at the bottom of the prefabricated pier column 1, and being conducive to supporting the prefabricated pier column 1 to swing with a larger rotation radius under the cooperation of the first prestressed tendon 3, thereby enhancing the anti-overturning ability of the assembled pier.

[0036] It should be pointed out here that Figure 1 This is a schematic diagram of the main structure of the first structure of the self-resetting prefabricated assembled bridge pier shown in this embodiment. Figure 1 In the embodiment, the prefabricated pier 1 comprises a plurality of prefabricated segments, which are spliced ​​into one piece along the vertical center line of the prefabricated pier 1 in a manner of being aligned end-to-end and vertically stacked. Figure 2 This is a schematic diagram of the main structure of the second structure of the self-resetting prefabricated assembled bridge pier shown in this embodiment. Figure 2 and Figure 1 The difference between the assembled piers shown is that Figure 2 The prefabricated pier column 1 shown is an integrated structure. In actual construction, in order to reduce the construction difficulty, it is preferred that the prefabricated pier column 1 is an assembled structure of multiple prefabricated segments.

[0037] At the same time, multiple prefabricated pier columns 1 can be provided, and the bottom of each prefabricated pier column 1 is connected to a corresponding foundation pedestal 2 through a first prestressed tendon 3 and an energy-absorbing connector 9 to form a whole, and a carrying structure is provided on the upper side of the prefabricated pier column 1, and the carrying structure can be a prefabricated cap beam known in the art, so that the top of the prefabricated pier column 1 and the prefabricated cap beam 7 are also connected to form a whole through a first prestressed tendon 3 and an energy-absorbing connector 9, wherein multiple prefabricated pier columns 1 are simultaneously connected to a prefabricated cap beam 7 to form an integrated structure, and form a structure such as Figure 3 The third type of self-resetting prefabricated assembled bridge pier is shown in Figure 3 In the embodiment, two prefabricated piers 1 are specifically provided, the bottoms of the two prefabricated piers 1 are respectively installed on a corresponding foundation pedestal 2, and a prefabricated cap beam 7 is commonly installed on the tops of the two prefabricated piers 1. Each prefabricated segment of the prefabricated pier 1, the foundation pedestal 2 and the prefabricated cap beam 7 can adopt a reinforced concrete structure known in the art.

[0038] As for the specific arrangement of the first prestressed tendons 3, it is preferred that the first prestressed tendons 3 can pass through the prefabricated pier 1 and the foundation pedestal 2 at the same time, so that the first prestressed tendons 3 can play a better stress conduction role, so that when the prefabricated pier 1 moves laterally or swings under the action of an earthquake, it can self-reset to its initial position under the stress of the first prestressed tendons 3.

[0039] In one of the preferred embodiments, one end of the first prestressed tendon 3 can be arranged to be anchored on the prefabricated pier 1, and the other end of the first prestressed tendon 3 can pass through the foundation pedestal 2 and be anchored on the side of the foundation pedestal 2. This is beneficial to transferring the stress generated on the first prestressed tendon 3 to the foundation pedestal 2, thereby greatly enhancing the lateral strength of the prefabricated pier 1, ensuring the self-resetting and anti-overturning properties of the prefabricated pier 1, and anchoring the other end of the first prestressed tendon 3 on the side of the foundation pedestal 2 is also beneficial to post-earthquake damage detection of the anchoring part and facilitates repair of damage.

[0040] In another preferred embodiment, both ends of the first prestressed tendon 3 can be anchored on the prefabricated pier 1, and at least a section of the middle part of the first prestressed tendon 3 is located in the foundation pedestal 2. In this way, on the basis of facilitating the transmission of the stress generated on the first prestressed tendon 3 to the foundation pedestal 2, it is also convenient to increase the length of the first prestressed tendon 3 as much as possible in a limited structural space, thereby further enhancing the lateral strength of the prefabricated pier 1 and ensuring the self-resetting and anti-overturning properties of the prefabricated pier 1. At the same time, anchoring both ends of the first prestressed tendon 3 on the prefabricated pier 1 greatly facilitates the on-site anchoring construction and subsequent maintenance operations of the anchoring parts by the staff.

[0041] The energy-absorbing connector 9 can be understood as an elastic connecting member with a certain rigidity known in the art, such as a shear rod, a steel plate, etc. As an auxiliary connection between the bottom of the prefabricated pier 1 and the foundation pedestal 2, the energy-absorbing connector 9 can be arranged vertically on the outer side or inside of its splicing structure, which is not specifically limited here. Of course, in order to achieve a better energy-absorbing effect, it is preferred that the energy-absorbing connector 9 is arranged vertically inside the splicing structure between the bottom of the prefabricated pier 1 and the foundation pedestal 2, so that when the prefabricated pier 1 moves laterally or swings under the action of an earthquake, the concrete structure at the bottom of the prefabricated pier 1 is effectively prevented from directly and rigidly contacting the foundation pedestal 2, thereby effectively preventing the corner of the prefabricated pier 1 from being damaged and broken due to stress concentration.

[0042] The prefabricated pier 1 can be a solid concrete structure or a hollow concrete structure. When the prefabricated pier 1 is a solid concrete structure, its cross-sectional shape can be circular, elliptical, rectangular or oval-shaped. When the prefabricated pier 1 is a hollow concrete structure, its cross-sectional shape can be a hollow circular, elliptical, rectangular or oval-shaped shape, which can greatly reduce its weight while ensuring the overall mechanical strength of the prefabricated pier 1.

[0043] At the same time, the prefabricated pier 1 is provided with second prestressed tendons 4 arranged along the long side direction thereof, one end of the second prestressed tendons 4 is anchored at the top of the prefabricated pier 1, and the other end is anchored in the sinking groove at the bottom of the prefabricated pier 1. A plurality of second prestressed tendons 4 can be provided, and the plurality of second prestressed tendons 4 are centrally symmetrically distributed along the vertical center line of the prefabricated pier 1 in the prefabricated pier 1, so as to ensure that the prefabricated pier 1 has relatively close lateral strength in different directions and has sufficient rigidity to ensure the self-resetting and anti-overturning properties of the prefabricated pier 1.

[0044] In one of the preferred embodiments, a second embedded pipe 6 arranged along the long side direction of the prefabricated pier 1 can be set in the prefabricated pier 1; when the prefabricated pier 1 is an integrated structure, the second embedded pipe 6 is set and embedded in the prefabricated pier 1 as a whole, and when the prefabricated pier 1 is an assembled structure of multiple prefabricated segments, the second embedded pipe 6 correspondingly includes multiple segments and is respectively embedded in each prefabricated segment, wherein the second embedded pipe 6 in adjacent prefabricated segments can play a better positioning role, which is convenient for assembling the prefabricated segments of each layer of the prefabricated pier 1 from top to bottom in sequence, thereby speeding up the efficiency of on-site assembly construction; here, the second prestressed tendon 4 is a bonded prestressed tendon, the second prestressed tendon 4 passes through the second embedded pipe 6, and cement mortar is filled between the second prestressed tendon 4 and the second embedded pipe 6. In this way, by bonding the second prestressed tendons 4 and the second embedded pipes 6 with cement mortar to form an integrated prestressed structure, the overall tensile strength of the integrated prestressed structure is enhanced, thereby correspondingly enhancing the self-resetting and anti-overturning properties of the prefabricated pier 1.

[0045] Furthermore, in this embodiment, a foot seat 8 is provided at the bottom of the prefabricated pier 1, and the foot seat 8 is connected to the foundation pedestal 2 through a plurality of energy-absorbing connectors 9, and the plurality of energy-absorbing connectors 9 are centrally symmetrically distributed along the vertical center line of the prefabricated pier 1; both ends of the first prestressed tendon 3 are anchored on the upper surface of the foot seat 8, and the middle part of the first prestressed tendon 3 is located in the foundation pedestal 2.

[0046] Specifically, by providing the foot 8, the problem of damage and breakage of the corner of the prefabricated pier 1 due to stress concentration can be effectively prevented, and the stress loss caused by local extrusion of the concrete structure at the bottom of the prefabricated pier 1 can be correspondingly reduced. In actual construction, the foot 8 can be set as an integrated structure with the prefabricated segment at the bottom of the prefabricated pier 1, that is, when the prefabricated pier 1 is a columnar structure, the foot 8 is also a columnar structure, and the foot 8 has the same cross-sectional shape as the prefabricated pier 1, but the cross-sectional area of ​​the foot 8 is larger than the cross-sectional area of ​​the prefabricated pier 1. The foot 8 can be made of high-strength or high-performance concrete, or a steel pipe can be wrapped around the foot 8 to prevent the concrete at the bottom joint of the prefabricated pier 1 from being severely broken during the lateral swing of the prefabricated pier 1.

[0047] At the same time, a plurality of energy dissipation connectors 9 are distributed symmetrically along the vertical center line of the prefabricated pier 1 , so as to ensure the consistency of energy dissipation at various locations around the footrest 8 .

[0048] In addition, both ends of the first prestressed tendon 3 are anchored on the upper surface of the foot seat 8, and the middle part of the first prestressed tendon 3 is located in the foundation pedestal 2. By designing the arrangement of the first prestressed tendon 3 in this way, not only can the two ends of the first prestressed tendon 3 be anchored conveniently, but also no matter in which direction the prefabricated pier 1 moves laterally or swings under the action of an earthquake, at least one end of the first prestressed tendon 3 will generate stress in time and quickly transmit the stress to the foundation pedestal 2, thereby facilitating the prefabricated pier 1 to swing with a larger turning radius and enhancing the anti-overturning ability of the assembled bridge pier.

[0049] In one preferred embodiment, the first prestressed tendon 3 is also provided with a first pre-buried pipeline 5 accordingly; Figure 1 and Figure 2 As shown, the first pre-buried pipe 5 includes a first straight segment, a U-shaped segment and a second straight segment, the first straight segment and the second straight segment are pre-buried in the foot seat 8, the U-shaped segment is pre-buried in the foundation pedestal 2 and the two ends of the U-shaped segment are located on the upper surface of the foundation pedestal 2, the upper ends of the first straight segment and the second straight segment are both located on the upper surface of the foot seat 8, the lower ends of the first straight segment and the second straight segment are both located on the lower surface of the foot seat 8 and correspond to the two ends of the U-shaped segment respectively; the first prestressed tendon 3 is a non-bonded prestressed tendon, the first prestressed tendon 3 passes through the first pre-buried pipe 5, and the two ends of the first prestressed tendon 3 extend from the two ends of the first pre-buried pipe 5 and are anchored on the upper surface of the foot seat 8.

[0050] Specifically, by providing the first embedded pipe 5, the arrangement path of the first prestressed tendons 3 is further optimized, and the first prestressed tendons 3 are provided with deformation support, which greatly facilitates the transmission of stress on the first prestressed tendons 3, thereby ensuring the self-resetting and anti-overturning properties of the prefabricated pier 1. It should be pointed out here that in order to further improve the self-resetting and anti-overturning properties of the prefabricated pier 1, multiple first prestressed tendons 3 and their corresponding first embedded pipes 5 can be provided, but it should be ensured that the axial symmetry line of each first embedded pipe 5 coincides with the vertical center line of the prefabricated pier 1.

[0051] Preferably, if Figure 4 As shown, the energy dissipation connecting member 9 in this embodiment includes an energy dissipation rod 91 , which is arranged vertically. The upper end of the energy dissipation rod 91 is connected to the foot seat 8 , and the lower end is connected to the foundation platform 2 .

[0052] Specifically, the energy dissipation rod 91 is preferably a metal rod that is easy to recover its deformation, such as a steel rod or a titanium alloy rod. By arranging the energy dissipation rod 91 in a vertical arrangement, it is convenient to realize the connection between the footrest 8 and the foundation pedestal 2, and it is convenient for the prefabricated pier 1 to undergo compression deformation during the lateral swinging process. Thus, the potential energy consumed by the energy dissipation rod 91 during the deformation process can assist the prefabricated pier 1 to reset itself to the initial position under the stress of the first prestressed tendons 3 and the second prestressed tendons 4, and prevent the corner of the prefabricated pier 1 from being damaged and broken due to stress concentration.

[0053] Preferably, if Figure 4 As shown, the present embodiment also includes: a fixed pad 92, a third embedded pipe 94 and an anchor; the fixed pad 92 is embedded in the upper surface of the foot seat 8, the third embedded pipe 94 is vertically embedded in the foot seat 8, and the anchor is embedded in the foundation base 2; the diameter of the energy-absorbing rod 91 is smaller than the inner diameter of the third embedded pipe 94, and the energy-absorbing rod 91 is inserted into the third embedded pipe 94, the upper end of the energy-absorbing rod 91 is connected to the fixed pad 92, and the lower end of the energy-absorbing rod 91 is threadedly connected to the anchor.

[0054] Specifically, the anchoring piece includes an embedded joint 95 and an anchor head 96, wherein the embedded joint 95 can be a threaded sleeve, and the anchor head 96 can be an embedded steel bar in the form of a 90° hook. The length of the embedded steel bar can be adaptively set according to the requirements of the anchoring force, so that the lower end of the threaded sleeve can be connected to the end of the embedded steel bar away from the hook, and embedded together in the foundation pedestal 2. When assembling the energy dissipation connector 9, the lower end of the energy dissipation rod 91 is threadedly connected to the upper end of the threaded sleeve, and the upper end of the energy dissipation rod 91 is connected to the fixed pad 92.

[0055] At the same time, Figure 4As shown, the energy dissipation rod 91 includes a middle section and two threaded connection sections. The two threaded connection sections are arranged at both ends of the middle section, and the diameter of the threaded connection section is larger than the diameter of the middle section. The diameter of the middle section is smaller than the inner diameter of the third pre-buried pipe 94. Therefore, there is a certain gap between the middle section of the energy dissipation rod 91 and the third pre-buried pipe 94 along the radial direction, so that the energy dissipation rod 91 has sufficient space for compression deformation.

[0056] In addition, Figure 5 A fixed pad 92 in the shape of a rectangular ring structure is specifically illustrated, the inner edge of the fixed pad 92 is adapted to the periphery of the prefabricated pier 1, and the outer edge of the fixed pad 92 is matched in shape to the periphery of the foot 8. The fixed pad 92 is provided with a plurality of first through holes 921 arranged along its circumference.

[0057] like Figure 4 and Figure 5 As shown, a first threaded groove 922 corresponding to the first through hole 921 is provided on the front side end face of the fixing pad 92, and the first threaded groove 922 is threadedly connected to the brim of the first fixing cap 98, wherein the first fixing cap 98 is cylindrical and has an open structure at the bottom, so that the upper end of the energy dissipation rod 91 extends from the upper side of the fixing pad 92 after passing through the first through hole 921, and is fastened by the locking nut 97, and at the same time, the upper end of the energy dissipation rod 91 extends into the first fixing cap 98 and abuts against the cap top of the first fixing cap 98. Therefore, the first fixing cap 98 can not only effectively prevent rainwater and other external debris from entering the third pre-buried pipe 94 and causing erosion to the third pre-buried pipe 94 and the energy dissipation rod 91, but also limit the upper end of the energy dissipation rod 91, ensuring the stability of the installation structure of the energy dissipation rod 91 during the deformation and energy dissipation process. It should be pointed out here that in order to achieve waterproof and rust-proof treatment of the two anchoring ends of the first prestressed tendon 3, a second through hole 924 and a second threaded groove 925 corresponding to the anchoring end of the first prestressed tendon 3 can also be opened on the fixing pad 92, and the corresponding second fixing cap 99 can be installed in the second threaded groove 925 to protect the anchoring end of the first prestressed tendon 3.

[0058] like Figure 6 and Figure 7 As shown, when the fixing pad 92 is embedded in the upper surface of the foot seat 8, a plurality of threaded countersunk holes 923 arranged along its circumference are opened on the back end surface of the fixing pad 92, and each threaded countersunk hole 923 is matched with an embedded bolt 93, and the embedded bolt 93 is embedded in the foot seat 8 along the direction of the above-mentioned vertical center line, so that the fixing pad 92 can be embedded in the upper surface of the foot seat 8.

[0059] In addition, it should be pointed out that in Figure 3In the structure shown, a foot 8 is also provided on the top of the prefabricated pier 1, and the foot 8 and the prefabricated cap beam 7 can also be connected by the same method as shown in the figure. Figure 4 The energy dissipation connecting member 9 shown is connected to the first prestressed tendon 3 .

[0060] Preferably, if Figure 8 As shown, the present embodiment also provides a construction method for the self-resetting prefabricated assembled pier as described above, comprising: S1, preparing a prefabricated pier column and a foundation pedestal; S2, hoisting the prefabricated pier column on the foundation pedestal, ensuring that the first straight section and the second straight section of the first pre-buried pipe correspond to the two ends of its U-shaped section respectively, and ensuring that the lower end of the third pre-buried pipe corresponds to the anchor piece; S3, inserting the first prestressed tendon into the first pre-buried pipe, the two ends of the first prestressed tendon extend from the two ends of the first pre-buried pipe and are anchored on the fixed pad, and inserting the energy-absorbing rod into the third pre-buried pipe, the lower end of the energy-absorbing rod is threadedly connected to the anchor piece, and the upper end of the energy-absorbing rod is fastened to the fixed pad.

[0061] Specifically, during actual construction, the preparation of prefabricated piers can be completed in a prefabrication yard near a factory or a construction site, and the prefabrication of the corresponding prefabricated segments of the prefabricated piers can be carried out in the prefabrication yard. The positions of the embedded components are fixed after the steel cage is tied and the formwork is assembled. The second embedded pipe is fixed at the corresponding position in the steel cage. For the prefabricated segments at the bottom of the prefabricated pier, the first straight line segment and the second straight line segment of the first embedded pipe and the third embedded pipe should also be embedded in the foot seat, and the fixing pads are fixedly connected on the upper surface thereof by embedded bolts. After the embedded components are installed, concrete is poured into the assembly formwork and cured to the design strength.

[0062] like Fig. 9 As shown, the foundation cap can be prefabricated in advance or cast on the construction site. When making the foundation cap, the U-shaped section and anchoring piece of the first embedded pipe can be embedded in the foundation cap in the same manner as described above.

[0063] Then, the prefabricated pier is transported to the construction site, the second prestressed tendon is pre-inserted into the second embedded pipe of the prefabricated segment at the bottom of the prefabricated pier, and the lower end of the second prestressed tendon is anchored. Then, the prefabricated segment is hoisted on the foundation pedestal, ensuring that the first straight section and the second straight section of the first embedded pipe correspond to the two ends of its U-shaped section respectively, and ensuring that the lower end of the third embedded pipe corresponds to the anchor.

[0064] Next, the first prestressed tendon is inserted into the first embedded pipe, the two ends of the first prestressed tendon extend from the two ends of the first embedded pipe and are anchored on the fixed pad, and the energy-absorbing rod is inserted into the third embedded pipe, the lower end of the energy-absorbing rod is threadedly connected to the anchor, and the upper end of the energy-absorbing rod is fastened to the fixed pad.

[0065] Finally, the other prefabricated sections of the prefabricated pier are installed upward layer by layer. After the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, cement mortar is injected into the second embedded pipe, and the upper end of the second prestressed tendon is anchored to the top of the prefabricated pier, and the installation is completed.

[0066] From the above, it can be seen that the construction method based on the above-mentioned self-resetting prefabricated assembled piers provided in this embodiment is convenient to operate during construction, with high construction efficiency, and the assembled piers after construction have self-resetting properties and good anti-overturning properties, which effectively solves the problem that the corners of the existing assembled piers are easily damaged and broken due to stress concentration, and it is easy to repair the damaged parts.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-resetting prefabricated assembled bridge pier, comprising a prefabricated pier column and a foundation cap, characterized in that: Also includes: The first prestressed tendons and the energy-absorbing connector; the bottom of the prefabricated pier column and the foundation cap are connected to form a whole through the first prestressed tendons and the energy-absorbing connector respectively; The prefabricated pier column is provided with second prestressed tendons arranged along the long side direction thereof, one end of the second prestressed tendons is anchored at the top of the prefabricated pier column, and the other end is anchored in a sinking groove at the bottom of the prefabricated pier column; A foot seat is provided at the bottom of the prefabricated pier, and the foot seat is connected to the foundation pedestal through a plurality of energy-absorbing connectors, and the plurality of energy-absorbing connectors are centrally symmetrically distributed along the vertical center line of the prefabricated pier; both ends of the first prestressed tendon are anchored on the upper surface of the foot seat, and the middle part of the first prestressed tendon is located in the foundation pedestal.

2. The self-resetting prefabricated assembled bridge pier according to claim 1 is characterized in that: The prefabricated piers include a plurality of columns, a carrying structure is disposed on the upper side of the prefabricated piers, and the top of the prefabricated piers and the carrying structure are connected to form a whole through the first prestressed tendons and the energy-absorbing connectors respectively; And / or, the prefabricated pier comprises a plurality of prefabricated segments.

3. The self-resetting prefabricated assembled bridge pier according to claim 2 is characterized in that: It also includes: a first pre-buried pipeline; the first pre-buried pipeline includes a first straight segment, a U-shaped segment and a second straight segment, the first straight segment and the second straight segment are pre-buried in the foot seat, the U-shaped segment is pre-buried in the foundation pedestal and both ends of the U-shaped segment are located on the upper surface of the foundation pedestal, the upper ends of the first straight segment and the second straight segment are both located on the upper surface of the foot seat, and the lower ends of the first straight segment and the second straight segment are both located on the lower surface of the foot seat and correspond to the two ends of the U-shaped segment respectively; The first prestressed tendon is an unbonded prestressed tendon, the first prestressed tendon passes through the first embedded pipe, and two ends of the first prestressed tendon extend from two ends of the first embedded pipe and are anchored on the upper surface of the foot seat.

4. The self-resetting prefabricated assembled bridge pier according to claim 2 is characterized in that: It also includes: a second pre-buried pipe arranged along the long side direction of the prefabricated pier column; the second pre-buried pipe is pre-buried in the prefabricated pier column in an integrated manner, or the second pre-buried pipe includes a plurality of segments, and is respectively pre-buried in each of the prefabricated segments; The second prestressed tendons are bonded prestressed tendons, the second prestressed tendons pass through the second pre-buried pipe, and cement mortar is filled between the second prestressed tendons and the second pre-buried pipe.

5. The self-resetting prefabricated assembled bridge pier according to claim 2 is characterized in that: The energy dissipation connecting member comprises an energy dissipation rod, and the energy dissipation rod is arranged vertically; It also includes: a fixed pad, a third embedded pipe and an anchor; the fixed pad is embedded in the upper surface of the base, the third embedded pipe is vertically embedded in the base, and the anchor is embedded in the foundation base; the diameter of the energy-absorbing rod is smaller than the inner diameter of the third embedded pipe, and the energy-absorbing rod is inserted into the third embedded pipe, the upper end of the energy-absorbing rod is connected to the fixed pad, and the lower end of the energy-absorbing rod is threadedly connected to the anchor.

6. The self-resetting prefabricated assembled bridge pier according to claim 5 is characterized in that: The fixing pad is provided with a threaded groove, the threaded groove is threadedly connected to the brim of the fixing cap, and the upper end of the energy dissipation rod extends from the upper side of the fixing pad and abuts against the top of the fixing cap.

7. A construction method for a self-resetting prefabricated assembled bridge pier according to any one of claims 1 to 6, characterized in that: include: S1, prepare prefabricated piers and foundation caps; S2, hoisting the prefabricated pier column onto the foundation cap, ensuring that the first straight section and the second straight section of the first pre-buried pipe correspond to the two ends of its U-shaped section respectively, and ensuring that the lower end of the third pre-buried pipe corresponds to the anchor; S3, insert the first prestressed tendon into the first embedded pipe, the two ends of the first prestressed tendon extend from the two ends of the first embedded pipe and are anchored on the fixed pad, and the energy-absorbing rod is inserted into the third embedded pipe, the lower end of the energy-absorbing rod is threadedly connected to the anchor, and the upper end of the energy-absorbing rod is fastened to the fixed pad.

8. The construction method according to claim 7, characterized in that: S2 further includes: inserting the second prestressed tendon into the second pre-buried pipe of the prefabricated segment at the bottom of the prefabricated pier column, anchoring the lower end of the second prestressed tendon, and then hoisting the prefabricated segment on the foundation cap; S3 further includes: installing other prefabricated sections of the prefabricated pier column upward layer by layer in sequence, injecting cement mortar into the second embedded pipe after the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, and anchoring the upper end of the second prestressed tendon to the top of the prefabricated pier column.

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