A replaceable assembled earthquake-resistant bridge pier tie beam and construction method thereof

Abstract

The present invention discloses a replaceable assembled earthquake-resistant bridge pier tie beam and a construction method thereof. A replaceable assembled earthquake-resistant bridge pier tie beam comprises: a prefabricated pier column; a prefabricated tie beam, which is arranged between adjacent prefabricated pier columns, and has tie beam connectors at both ends; a prefabricated node collar, which is arranged at the outer periphery of the prefabricated pier column, and has a node collar connector on one side for connecting with the prefabricated tie beam; a post-cast strip, which is arranged at the connection between the prefabricated node collar and the prefabricated tie beam. The construction method comprises: prefabricating prefabricated pier columns, prefabricated tie beams and prefabricated node collars, and then sequentially installing the prefabricated pier columns, prefabricated node collars, and prefabricated tie beams, and pouring the post-cast strip. The present invention has important application value for rapid post-earthquake recovery and green development of public transportation.

Description

Technical Field

[0001] The invention relates to the field of civil engineering and transportation technology, and in particular to a replaceable assembled earthquake-resistant bridge pier tie beam and a construction method thereof. Background Art

[0002] Prefabricated concrete bridge structure is a concrete structure formed by assembling and connecting prefabricated components as the main load-bearing components. It is one of the important development directions of my country's transportation industry. It has the advantages of controllable production quality standards, high degree of industrialization, short on-site operation time, less delays to existing traffic, and low environmental pollution.

[0003] In order to reduce the reconstruction cost and speed up the reconstruction progress in the disaster area, in addition to some severely damaged bridge structures that need to be demolished and rebuilt, a large number of slightly and moderately damaged bridges can be repaired and reinforced after the technical condition level is assessed to meet the subsequent use function and bearing capacity requirements. At present, the application of prefabricated pier structures with recoverable functions in actual engineering is not common, and the research on the seismic performance and recoverability of prefabricated piers still has the following technical problems:

[0004] 1. At present, most bridge pier tie beams are constructed by cast-in-place method, which requires setting up an aerial casting platform between the piers. Workers need to tie steel bars, support formwork and cast concrete on site at high altitude. The high-altitude working surface is small, the wet work workload is large, the construction efficiency is low and the safety risk is high.

[0005] 2. A large number of earthquake damage investigations and studies have shown that connection nodes are often the weak link in the earthquake resistance of the structure. The strength and stiffness of the nodes where the piers and tie beams are connected are insufficient. The nodes are prone to large deformation or damage under the action of earthquakes, making it difficult to push the piers back to their original position for reinforcement. This problem is particularly prominent in prefabricated bridge structures.

[0006] 3. In the seismic design of bridges, the tie beams of bridge piers are generally used as energy-absorbing components to dissipate seismic energy. Therefore, the tie beams are often the first to be damaged under the action of an earthquake.

[0007] Therefore, it is necessary to propose an assembled tie beam structure and construction method to reduce the time and risk of high-altitude operations. The assembled tie beam structure should focus on improving the seismic performance of the nodes, reducing residual displacement, and realizing the repairability of bridge piers after earthquake damage. At present, the application of assembled pier tie beams with recoverable functions in actual engineering is still very limited. The development of a reasonable and replaceable assembled tie beam is the key to achieving rapid repair of bridges after earthquake damage. Summary of the invention

[0008] In order to solve the above technical problems, the present invention discloses a replaceable assembled earthquake-resistant pier tie beam and a construction method thereof, which has important application value for the rapid post-earthquake recovery and green development of public transportation.

[0009] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0010] A replaceable assembled earthquake-resistant bridge pier tie beam, comprising:

[0011] Prefabricated piers;

[0012] A prefabricated tie beam, which is arranged between adjacent prefabricated piers and has tie beam connectors at both ends;

[0013] A prefabricated node collar, which is arranged on the periphery of the prefabricated pier, and a node collar connector is arranged on one side for connecting with the prefabricated tie beam;

[0014] The post-cast strip is arranged at the connection between the prefabricated node sleeve and the prefabricated tie beam, and is cast after the tie beam connector and the node sleeve connector are fixed.

[0015] Furthermore, the prefabricated node collar comprises an inner collar and an outer collar, wherein the outer collar is arranged on a side away from the prefabricated tie beam, and the inner collar is arranged on a side close to the prefabricated tie beam.

[0016] Furthermore, the tie beam connector is a tie beam energy-absorbing steel bar, both ends of which extend outward to the outside of both ends of the prefabricated tie beam, and the portion exposed from the prefabricated tie beam is provided with an external thread;

[0017] The node collar connector is a collar steel bar, which extends outward to the outside of one end of the prefabricated node collar close to the tie beam, and the portion exposed from the prefabricated node collar is provided with an external thread;

[0018] The tie beam energy-absorbing steel bars and the ring steel bars are connected via a threaded sleeve provided with an internal thread.

[0019] Furthermore, the energy-absorbing steel bars of the tie beam are arranged around the cross section of the prefabricated tie beam; and the positions of the ring steel bars match the positions of the energy-absorbing steel bars of the tie beam.

[0020] Furthermore, the inner side of the prefabricated node collar is provided with collar convex ribs, and the prefabricated pier column is provided with a pier column slot, and the collar convex ribs can be matched and embedded in the pier column slot;

[0021] Alternatively, a collar groove is provided on the inner side of the prefabricated node collar, and a collar rib is provided on the prefabricated pier column, and the collar rib can be matched and embedded in the collar groove.

[0022] Furthermore, the inner collar is provided with collar convex strips on the outer side surface close to the prefabricated tie beam, and the two end surfaces of the prefabricated tie beam are provided with tie beam notches, and the collar convex strips can be matched and inserted into the tie beam notches;

[0023] Alternatively, the inner collar is provided with collar grooves on the outer side surface close to the prefabricated tie beam, and the two end surfaces of the prefabricated tie beam are provided with tie beam convex strips, and the tie beam convex strips can be matched and inserted into the collar grooves.

[0024] Furthermore, two ends of the inner ring connected to the outer ring are provided with raised prestressed anchor blocks, and two ends of the outer ring connected to the inner ring are also provided with raised prestressed anchor blocks.

[0025] Furthermore, the inner ring and the outer ring are both provided with annular prestressed steel strands, and both ends of the prestressed steel strands respectively pass through the prestressed anchor blocks of the inner ring / outer ring where they are located, and pass through the prestressed anchor blocks of the outer ring / inner ring on the opposite side, and are fixed by prestressed anchors.

[0026] The construction method of the replaceable assembled earthquake-resistant bridge pier tie beam described above comprises the following steps:

[0027] S1. Prefabricate precast piers, precast tie beams and precast node collars;

[0028] S2. Install the prefabricated pier, put the prefabricated node collar around the designed position of the prefabricated pier, tension the prestressed steel strand, inject grouting material, and complete the installation of the prefabricated node collar;

[0029] S3. The threaded sleeve is inserted into the energy-absorbing steel bar of the tie beam to expose the part of the prefabricated tie beam, the prefabricated tie beam is hoisted to a corresponding height, the prefabricated tie beam is spliced ​​to the corresponding position of the prefabricated node collar, and the threaded sleeve is screwed in the direction of the collar steel bar to achieve the connection between the energy-absorbing steel bar of the tie beam and the collar steel bar;

[0030] S4. Construct the post-cast strip and complete the construction of the assembled seismic pier tie beam;

[0031] If the prefabricated tie beam is damaged, remove the small part of the damaged protective layer outside the threaded sleeve, loosen the threaded sleeve, and then take out the damaged prefabricated tie beam horizontally. Repeat steps S3 and S4 to complete the installation of the new prefabricated tie beam.

[0032] The construction method for adding replaceable assembled seismic pier tie beams to existing bridge piers is as follows: After cutting grooves on the existing bridge piers, construction is carried out according to the above steps S1 to S4.

[0033] The replaceable assembled seismic pier tie beam described above has the following advantages:

[0034] 1. The present invention is a prefabricated assembly component, which is easy to construct and does not require complex or large machinery. It can reduce the workload of on-site high-altitude formwork engineering and wet work, effectively improve construction efficiency, and the components are uniformly prefabricated in the factory to ensure construction quality and standardization.

[0035] 2. The prefabricated node collar of the present invention fixes two prefabricated node collars on the prefabricated pier column by setting prestressed anchor blocks, thereby increasing the cross section of the pier column. At the same time, by setting annular prestressed steel strands, annular prestress is formed, which can effectively improve the compressive strength and ductility of the core concrete, achieve the purpose of "strong node", and ensure that the energy consumption or damage parts of the bridge pier under the action of earthquake appear on the tie beam, effectively realizing the safety and repairability of the bridge during earthquake disasters. In addition, the prefabricated node collar is prefabricated with high-performance concrete, generally UHPC ultra-high performance concrete, which can better ensure its seismic performance.

[0036] 3. The ring steel bar is connected to the tie beam energy-absorbing steel bar through a threaded sleeve. The prefabricated tie beam can be replaced after being damaged. The damaged protective layer outside the threaded sleeve, i.e., the post-casting strip, can be removed horizontally after loosening the threaded sleeve. The new prefabricated tie beam can be prefabricated and installed to quickly repair the pier tie beam. When the prefabricated node ring is damaged and cracked, the prefabricated node ring can be replaced after releasing the prestress of the ring. The construction is simple and fast.

[0037] 4. The present invention can also be used for the rapid repair of existing bridge piers after earthquake damage, or for reinforcement projects where the lateral stiffness of bridge piers is insufficient. Prefabricated tie beams can be added after grooving the existing bridge piers. It has a wide range of applications and can significantly reduce bridge maintenance costs and shorten the time that existing bridges are closed to traffic due to construction. It has great application value and good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0039] Figure 2 It is a schematic diagram of the exploded structure of the connection between the prefabricated sleeve ring and the prefabricated tie beam of the present invention.

[0040] Figure 3 It is a schematic diagram of the exploded structure of the connection between the prefabricated pier column and the prefabricated sleeve ring of the present invention.

[0041] Figure 4 It is a perspective structural diagram in the main viewing direction after the prefabricated sleeve ring and prefabricated pier column are installed.

[0042] Figure 5 It is a perspective three-dimensional structural diagram after the prefabricated collar and prefabricated pier are installed.

[0043] Figure 6 The ring steel bar and the tie beam energy-absorbing steel bar are connected through a threaded sleeve.

[0044] In the figure, there are prefabricated pier 1, prefabricated node ring 2, outer ring 201, inner ring 202, prefabricated tie beam 3, prestressed steel strand 4, post-cast strip 5, threaded sleeve 6, ring steel bar 7, tie beam notch 8, tie beam energy-absorbing steel bar 9, ring convex strip 10, grouting material 11, ring convex rib 12, pier slot 13, prestressed anchor block 14, and prestressed anchor 15. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0046] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] A replaceable assembled seismic pier tie beam, such as Figure 1 and 2 As shown, it includes a prefabricated pier 1, a prefabricated tie beam 3, a prefabricated node collar 2 and a post-cast strip 5: wherein: a plurality of prefabricated piers 1 are provided, which are selected according to the actual situation of the bridge, arranged vertically, and prefabricated with ordinary concrete; a prefabricated tie beam 3 is prefabricated with ordinary concrete, arranged between two adjacent prefabricated piers 1, and has tie beam connectors at both ends; a prefabricated node collar 2 is prefabricated with high-performance concrete, arranged at the periphery of the prefabricated pier 1, and has a node collar connector on one side, which is used to connect with the prefabricated tie beam 3 through high-performance concrete prefabrication; a post-cast strip 5 is provided at the connection between the prefabricated node collar 2 and the prefabricated tie beam 3, and is cast after the tie beam connector and the node collar connector are fixed. The concrete used for casting the post-cast strip 5 is one grade higher than the concrete used for the tie beam.

[0049] Further, combined with Figure 3 As shown, each prefabricated node collar 2 is assembled from two prefabricated node collar units, including an inner collar 202 and an outer collar 201. The outer collar 201 is arranged on a side away from the prefabricated tie beam 3, and the inner collar 202 is arranged on a side close to the prefabricated tie beam 3, and connected to the prefabricated tie beam 3. After the prefabricated node collar units are assembled and fixed to the prefabricated pier 1, it is not only convenient to connect with the prefabricated tie beam 3, but also increases the cross-section of the prefabricated node collar 2 and the prefabricated pier 1. At the same time, the prefabricated node collar 2 is prefabricated with UHPC ultra-high performance concrete, which can effectively improve the seismic performance of the connection node.

[0050] Furthermore, both ends of the inner ring 202 connected to the outer ring 201 are provided with raised prestressed anchor blocks 14, and both ends of the outer ring 201 connected to the inner ring 202 are also provided with raised prestressed anchor blocks 14, which are used to set anchors or fixing parts to fix the inner ring 202 and the outer ring 201 together.

[0051] Furthermore, this embodiment provides a fixing and restraining structure of the inner ring 202 and the outer ring 201, combined with Figure 4 and Figure 5 As shown, the inner ring 202 and the outer ring 201 are both provided with annular prestressed steel strands 4, and both ends of the prestressed steel strands 4 respectively pass through the prestressed anchor blocks 14 of the inner ring 202 / outer ring 201 where they are located, and pass through the prestressed anchor blocks 14 of the outer ring 201 / inner ring 202 on the opposite side, and are fixed by prestressed anchors 15. It should be noted that the annular prestressed steel strands 4 can not only fix the precast node ring 2 on the precast pier 1, but also provide annular restraint force to the core concrete of the precast node ring 2, thereby improving the compressive strength and ductility of the core concrete, and further improving the seismic performance of the node. The number of prestressed steel strands 4 is not limited to that shown in the figure, and can be adjusted according to actual needs.

[0052] Further, combined with Figure 6As shown, the tie beam connector is a tie beam energy-absorbing steel bar 9, and the two ends of the tie beam energy-absorbing steel bar 9 extend outward to the outside of the two ends of the prefabricated tie beam 3, and the part exposed by the prefabricated tie beam 3 is provided with external threads; the node collar connector is a collar steel bar 7, which extends outward to the outside of one end of the prefabricated node collar 2 close to the tie beam, and the part exposed by the prefabricated node collar 2 is provided with external threads; the tie beam energy-absorbing steel bar 9 and the collar steel bar 7 are connected by a threaded sleeve 6 provided with an internal thread. After the collar steel bar 7 and the tie beam energy-absorbing steel bar 9 are connected by the threaded sleeve 6, the cast-in concrete is then cast to seal the threaded sleeve 6, the tie beam energy-absorbing steel bar 9 and the collar steel bar 7, that is, the cast post-cast strip 5 can complete the sealing of the threaded sleeve 6, the tie beam energy-absorbing steel bar 9 and the collar steel bar 7. The length of the threaded sleeve 6 is determined according to the specification requirements, and the thread length of the tie beam energy-absorbing steel bar 9 is slightly greater than the length of the threaded sleeve 6. When installing the prefabricated tie beam 3, first completely screw the threaded sleeve 6 into the part of the tie beam energy-absorbing steel bar 9 that is exposed from the prefabricated tie beam 3, and after the prefabricated tie beam 3 is moved in horizontally and the tie beam energy-absorbing steel bar 9 is aligned and tightened with the ring steel bar 7, screw the threaded sleeve 6 toward the ring steel bar 7 to achieve the connection between the threaded sleeve 6 and the tie beam energy-absorbing steel bar 9 and the inner ring steel bar 7. The number of ring steel bars 7 is determined according to the number of tie beam energy-absorbing steel bars 9.

[0053] Furthermore, the tie beam energy-absorbing steel bars 9 are arranged around the cross section of the prefabricated tie beam 3 ; the position of the ring steel bars 7 matches the position of the tie beam energy-absorbing steel bars 9 .

[0054] Furthermore, in order to facilitate the installation of the prefabricated node collar 2 and the stability of its connection with the prefabricated pier column 1, Figure 3 As shown, the inner side of the prefabricated node collar 2 is provided with a collar rib 12, and the prefabricated pier 1 is provided with an inwardly recessed pier slot 13, and the collar rib 12 can be matched and embedded in the prefabricated pier 1. The prefabricated pier 1 has a pre-opened pier slot 13, so that the quick alignment and quick fixed connection of the installation can be achieved, and the vertical slip phenomenon of the prefabricated node collar 2 can be better prevented. The collar rib 12 can also provide a transmission path for the annular prestress, so that the annular prestress is effectively transmitted to the core concrete of the prefabricated pier 1. Or the setting can also be exchanged, with a collar slot provided on the inner side of the prefabricated node collar 2, and a pier rib provided on the prefabricated pier 1, and the pier rib can be matched and embedded in the collar slot, which is not shown in the figure.

[0055] It should be noted that the inner diameter of the prefabricated node ring 2 is slightly larger than the diameter of the prefabricated pier 1. A certain gap is reserved between the prefabricated node ring 2 and the prefabricated pier 1, but the ring rib 12 and the pier slot 13 are tightly pressed against each other to prevent the prestressed steel strand 4 from tensioning and causing the prefabricated node ring 2 to crack. After the prestressing is completed, grouting material 11 is injected into the gap between the prefabricated node ring 2 and the prefabricated pier 1 to enhance the integrity of the prefabricated node ring 2 and the prefabricated pier 1.

[0056] Further, in order to facilitate the installation of the prefabricated tie beam 3 and the stability of its connection with the prefabricated node collar 2, Figure 2 As shown, the inner ring 202 is provided with a ring convex strip 10 near the outer side surface of the precast tie beam 3, and the ring convex strip 10 is generally arranged horizontally, and the two end surfaces of the precast tie beam 3 are provided with tie beam grooves 8, and the ring convex strip 10 can match and embed into the tie beam grooves 8 pre-opened in the precast tie beam 3. In order to ensure that the ring convex strip 10 can be smoothly inserted into the tie beam groove 8, the inner ring 202 is provided with a square convex block near the outer side surface of the precast tie beam 3. The square convex block is at the same height as the ring steel bar 7, so that it can fit with the tie beam convex block on the outer side surface of the precast tie beam 3 where the tie beam groove 8 is located; after the precast tie beam 3 is lifted to the corresponding height and the tie beam groove 8 is aligned with the ring convex strip 10, the precast tie beam 3 can be horizontally embedded and installed, and the ring convex strip 10 can vertically fix the precast tie beam 3 on the inner ring 202, and can also be used as a positioning piece to facilitate the alignment of the top-tightening tie beam energy-absorbing steel bars 9 and the ring steel bars 7. Alternatively, the inner collar 202 is provided with collar grooves near the outer side surface of the prefabricated tie beam 3, and the two end surfaces of the prefabricated tie beam 3 are provided with tie beam convex strips, which can be matched and inserted into the collar grooves. This method is not shown in the figure.

[0057] The construction method of the replaceable assembled earthquake-resistant bridge pier tie beam described above comprises the following steps:

[0058] S1. Prefabricate the pier 1, prefabricate the tie beam 3 and prefabricate the node collar 2 in the factory in advance, and pay attention to pre-embedding the corresponding steel bars (the collar steel bars 7 and the tie beam energy-absorbing steel bars 9). After prefabrication, transport them to the construction site;

[0059] S2. Install the prefabricated pier 1, the prefabricated node collar 2 is set on the periphery of the design position of the prefabricated pier 1, the inner collar 202, the outer collar 201 of the collar rib 12 is aligned with the pier slot 13, the prestressed steel strand 4 is tensioned in the annular direction, the grouting material 11 is injected, and the installation of the prefabricated node collar 2 is completed;

[0060] S3. The threaded sleeve 6 is inserted into the part of the tie beam energy-absorbing steel bar 9 that exposes the prefabricated tie beam 3, the prefabricated tie beam 3 is hoisted to a corresponding height, the prefabricated tie beam 3 is spliced ​​to the corresponding position of the prefabricated node collar 2, and after the tie beam notch 8 is aligned with the collar convex strip 10, the prefabricated tie beam 3 can be horizontally embedded and installed, and the threaded sleeve 6 is screwed in the direction of the collar steel bar 7 to achieve the connection between the tie beam energy-absorbing steel bar 9 and the collar steel bar 7;

[0061] S4. Construct post-cast strip 5 and complete the construction of assembled seismic pier tie beams;

[0062] During operation, if the prefabricated tie beam 3 is damaged, the small part of the protective layer damaged by the shock outside the threaded sleeve is removed, and the damaged prefabricated tie beam 3 can be horizontally taken out after loosening the threaded sleeve 6, and a new prefabricated tie beam 3 is remade, and steps S3 and S4 are repeated to complete the installation of the new prefabricated tie beam 3. When the prefabricated node collar is damaged and cracked by the shock, the collar prestress (prestressed anchor 15 and prestressed steel strand 4) can also be released for replacement, which is simple and fast to construct.

[0063] The construction method of adding a replaceable assembled earthquake-resistant pier tie beam to an existing bridge pier is as follows: a prefabricated node collar 2 is installed after an annular groove is made on the existing bridge pier, and the construction is carried out according to the above steps S1 to S4 (without prefabricating the pier column 1). It can be seen that the use of the prefabricated node collar 2 can also apply the prefabricated tie beam 3 to the existing bridge pier, and the prefabricated tie beam 3 can be added after the groove is made on the existing bridge pier, which is widely used.

Claims

1. A replaceable assembled seismic pier tie beam, characterized in that include: Precast piers, which are precast using ordinary concrete; Prefabricated tie beams, which are prefabricated with ordinary concrete and are arranged between adjacent prefabricated piers, with tie beam connectors arranged at both ends; A prefabricated node collar, which is prefabricated with high-performance concrete and arranged on the periphery of the prefabricated pier, and a node collar connector is arranged on one side for connecting with the prefabricated tie beam; A post-cast strip is provided at the connection between the prefabricated node collar and the prefabricated tie beam, and is cast after the tie beam connector and the node collar connector are fixed; The prefabricated node collar comprises an inner collar and an outer collar, wherein the outer collar is arranged on a side away from the prefabricated tie beam, and the inner collar is arranged on a side close to the prefabricated tie beam; The tie beam connector is a tie beam energy-absorbing steel bar, both ends of which extend outward to the outside of both ends of the prefabricated tie beam, and the portion exposed from the prefabricated tie beam is provided with an external thread; The node collar connector is a collar steel bar, which extends outward to the outside of one end of the prefabricated node collar close to the tie beam, and the portion exposed from the prefabricated node collar is provided with an external thread; The tie beam energy-absorbing steel bars and the ring steel bars are connected by a threaded sleeve provided with an internal thread; The tie beam energy-absorbing steel bars are arranged around the prefabricated tie beam cross section; the position of the ring steel bars matches the position of the tie beam energy-absorbing steel bars; The inner side of the prefabricated node collar is provided with collar convex ribs, and the prefabricated pier column is provided with a pier column slot, and the collar convex ribs can be matched and embedded in the pier column slot; The inner collar is provided with collar convex strips on the outer side surface close to the prefabricated tie beam, and the two end surfaces of the prefabricated tie beam are provided with tie beam notches, and the collar convex strips can be matched and inserted into the tie beam notches; Or, the inner collar is provided with collar grooves on the outer side surface close to the prefabricated tie beam, and the two end surfaces of the prefabricated tie beam are provided with tie beam convex strips, and the tie beam convex strips can be matched and inserted into the collar grooves; Both ends of the inner ring connected to the outer ring are provided with raised prestressed anchor blocks, and both ends of the outer ring connected to the inner ring are also provided with raised prestressed anchor blocks; The inner ring and the outer ring are both provided with annular prestressed steel strands, and both ends of the prestressed steel strands pass through the prestressed anchor blocks of the inner ring / outer ring where they are located, and pass through the prestressed anchor blocks of the outer ring / inner ring on the opposite side, and are fixed by prestressed anchors.

2. The construction method of replaceable assembled earthquake-resistant bridge pier tie beam according to claim 1, characterized in that The following steps are involved: S1. Prefabricate precast piers, precast tie beams and precast node collars; S2. Install the prefabricated pier, put the prefabricated node collar around the designed position of the prefabricated pier, tension the prestressed steel strand, inject grouting material, and complete the installation of the prefabricated node collar; S3. The threaded sleeve is inserted into the energy-absorbing steel bar of the tie beam to expose the part of the prefabricated tie beam, the prefabricated tie beam is hoisted to a corresponding height, the prefabricated tie beam is spliced ​​to the corresponding position of the prefabricated node collar, and the threaded sleeve is screwed in the direction of the collar steel bar to achieve the connection between the energy-absorbing steel bar of the tie beam and the collar steel bar; S4. Construct the post-cast strip and complete the construction of the assembled seismic pier tie beam; If the prefabricated tie beam is damaged, remove a small part of the damaged protective layer, loosen the threaded sleeve, and then take out the damaged prefabricated tie beam horizontally, and repeat steps S3 and S4 to complete the installation of the new prefabricated tie beam.

Images