A prefabricated assembled bridge pier connection structure and construction method thereof

Abstract

The present invention provides a novel prefabricated pier connection structure and a construction method thereof, wherein the connection structure comprises an assembled pier, wherein a plurality of semi-grouting sleeves are arranged inside the assembled pier, wherein the plurality of semi-grouting sleeves are used to connect the longitudinal steel bars in the assembled pier and the reserved steel bars in the pedestal, wherein the pedestal is contacted and connected with a plurality of concrete piles below, wherein a plurality of steel bracket structures are arranged on the plurality of concrete piles, and each of the plurality of steel bracket structures is provided with non-bonded prestressed tendons; the present invention also provides a construction method of the connection structure, including prefabricated components, bottom construction, installation of prestressed tendons and hoisting steps. The present invention enables the bridge to be subjected to the self-resetting effect of the prestressed tendons in both horizontal directions, effectively improving the seismic performance of the bridge in the longitudinal and transverse directions, improving the seismic performance of the bridge while reducing the damage to the pier itself, and greatly improving the repairability of the bridge after an earthquake.

Description

Technical Field

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

[0002] With the continuous development of modern cities, the demand for bridge construction is also growing. As an important link connecting cities, bridges play a vital role. However, earthquakes are frequent in my country, which makes bridges face serious earthquake threats. The current seismic design methods of bridges at home and abroad mainly use the ductility of bridge piers for seismic design, allowing bridge piers to enter plasticity under strong earthquakes and form plastic hinges. Therefore, bridge piers may be seriously damaged and produce large plastic deformations. After the earthquake, bridge piers will produce permanent residual displacements. However, earthquake disasters in the past have shown that it is far from enough to only focus on the seismic performance goals of bridges with life safety and anti-collapse. Even if the bridge does not collapse after an earthquake, it may face a situation that is difficult to repair, resulting in huge economic losses.

[0003] Self-righting concrete structures are a potential structural form that can greatly improve the post-earthquake repairability of structures. Self-righting structures not only allow components to dissipate seismic energy during an earthquake, but also help components return to their initial positions after an earthquake, thereby reducing or eliminating residual deformation of the structure and improving the post-earthquake repairability of the structure. However, current self-righting bridge piers require the installation of prestressed tendons inside the piers, which is not conducive to on-site construction and post-earthquake replacement. At the same time, the self-righting swing of the piers also faces the risk of uncontrolled swinging and overturning and collapse. Therefore, it is necessary to propose a new type of bridge pier structure that is simple to construct, has excellent self-righting performance and seismic resistance, and is also convenient for post-earthquake repair. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated assembled pier connection structure and a construction method thereof, which adopts a foundation swing scheme to achieve a shock-absorbing effect, and at the same time adds unbonded prestressed tendons to the swing foundation to provide a self-resetting function, thereby improving the post-earthquake repairability of the bridge. In addition, a new type of steel bracket that can be flexibly arranged is adopted, so that the bridge can be affected by the self-resetting effect of the prestressed tendons in two horizontal directions, thereby ensuring the seismic performance of the structure while effectively improving the aforementioned technical problems.

[0005] The technical solution adopted by the present invention is: a prefabricated assembled pier connection structure, the connection structure includes an assembled pier, a plurality of semi-grouting sleeves are arranged inside the assembled pier, the plurality of semi-grouting sleeves are used to connect the longitudinal steel bars in the assembled pier and the reserved steel bars in the pedestal, a high-strength mortar base layer is also laid at the contact part between the assembled pier and the pedestal, a plurality of concrete piles are contacted and connected below the pedestal, a plurality of steel bracket structures are arranged on the plurality of concrete piles, a plurality of unbonded prestressed tendons are arranged on the plurality of steel bracket structures, the other ends of the plurality of unbonded prestressed tendons pass through the pedestal and are anchored to the top of the pedestal.

[0006] Preferably, a plurality of reserved grooves are provided at the bottom of the foundation, the upper part of the concrete pile is embedded in the reserved grooves, and the pile head is wrapped with a protective pad, the diameter of the reserved groove is larger than the diameter of the concrete pile, and the space formed by the difference between the diameter of the reserved groove and the diameter of the concrete pile is also provided with an elastic material for buffering, for example, the protective pad should be made of rubber and other materials with strong deformation and recovery capabilities, and the specific model can be flexibly selected according to actual conditions to reduce damage to the concrete pile and the foundation when they are swung, there is no bonding between the concrete pile and the foundation, and between the protective pad and the reserved groove, so as to facilitate the lifting and swinging of the foundation.

[0007] Preferably, the steel corbel structure comprises an upper end plate and a lower end plate, an intermediate connecting plate is further provided between the upper end plate and the lower end plate, a plurality of bolt insertion holes are provided on the upper end plate and the lower end plate, the steel corbel structure is connected to the concrete pile column by bolts through the plurality of bolt insertion holes, the contact surfaces between the steel corbel structure and the concrete pile column are both arc surfaces that fit the concrete pile column, thereby further improving the shear bearing capacity between the steel corbel and the pile column; the upper end plate, the lower end plate and the intermediate connecting plate are all made of solid steel thick plates.

[0008] Preferably, the contact parts of the upper end plate, the lower end plate and the concrete piles are all coated with high-strength glue.

[0009] Preferably, the bolt through holes are evenly distributed on the upper end plate and the lower end plate and the spacing between two adjacent bolt through holes is not less than one times of their own hole diameters, the distance between the bolt through holes located at both ends of the upper end plate and both ends of the upper end plate is not less than one times of their own hole diameters, the distance between the bolt through holes located at both ends of the lower end plate and both ends of the lower end plate is not less than one times of their own hole diameters, the positions of the bolt through holes on the upper end plate and the lower end plate correspond one to one, and all the bolt through holes on the lower end plate or the upper end plate of each steel corbel structure are located on the same axis, so that the bolts can play an effective anchoring role.

[0010] Preferably, a plurality of first prestressed embedded pipes are arranged in the pedestal, a second prestressed embedded pipe is arranged below each of the first prestressed embedded pipes and on the intermediate connecting plate, one end of the unbonded prestressed tendon is arranged on the lower side of the intermediate connecting plate, and the other end thereof passes through the second prestressed embedded pipe and the first prestressed embedded pipe in sequence and is anchored to the top of the pedestal.

[0011] Preferably, the unbonded prestressed tendons are made of steel strands or steel wire bundles; the unbonded prestressed tendons are arranged in one-to-one correspondence with the steel corbel structures on the concrete piles; the unbonded prestressed tendons arranged on the concrete piles are all parallel; the unbonded prestressed tendons can effectively prevent the sliding and dislocation of the pedestal during the swinging process, prevent the nonlinear behavior of the prefabricated piers themselves, and reduce the displacement of the bridge deck during earthquakes, while providing a self-resetting function when the prefabricated piers and the pedestals swing. When the seismic load exceeds the strength of the unbonded prestressed tendons, the design ensures that the steel bundles are damaged before the prefabricated piers are damaged, and the unbonded prestressed tendons are easy to maintain and replace after earthquake damage.

[0012] Preferably, the arc corresponding angle α of the contact surface between the steel corbel structure and the concrete pile column is 90°; the angle can be reduced according to the actual design, and the number of bolts is determined according to the required shear bearing capacity. The axis of each pair of steel corbel structures remains unchanged. The steel corbel structures and bolts are independent prefabricated components and are located at a shallow depth from the ground, which is easy to repair and replace after earthquake damage or rust.

[0013] Preferably, the concrete piles at the four corners of the pedestal are each provided with two of the steel corbel structures away from the center of the pedestal, and the remaining concrete piles are each provided with one of the steel corbel structures away from the center of the pedestal.

[0014] Preferably, when the number of the concrete piles is two, the concrete piles are symmetrically provided with four steel corbel structures, and the piles and the steel corbel structures are connected by bolts at the construction site; each of the steel corbel structures is symmetrically arranged on four sides of each of the concrete piles,

[0015] Preferably, when the number of the concrete piles is four, the four concrete piles are each provided with two of the steel corbel structures away from the center of the pedestal; when the number of the concrete piles is six, the concrete piles located at the four corners of the pedestal are each provided with two of the steel corbel structures away from the center of the pedestal, and the two concrete piles located in the middle of the pedestal are each provided with one of the steel corbel structures away from the center of the pedestal.

[0016] A construction method for prefabricated assembled bridge piers comprises the following steps:

[0017] S1: Prefabricated components: including prefabricating the assembled bridge pier, anchoring the lower end of the longitudinal steel bar in the semi-grouting sleeve; prefabricating the cap, setting the reserved groove at the bottom of the cap; prefabricating the steel bracket structure, opening the bolt through holes on the lower end plate and the upper end plate; prefabricating the concrete pile column, and opening screw holes matching the bolt through holes on the concrete pile column;

[0018] S2: Bottom construction: first excavate the foundation, then press the concrete pile into the soil, and reserve space for installing the steel corbel structure, then fix the steel corbel structure on the concrete pile by bolts, and fix the protective pad with high-strength glue to wrap around the pile head of the concrete pile; finally, hoist the cap and adjust the angle so that the pile head of the concrete pile is inserted into the reserved groove; S3: Insert, tension and anchor prestressed tendons: anchor one end of the unbonded prestressed tendon at the lower end of the second prestressed embedded pipe and below the middle connecting plate, and the other end thereof passes through the second prestressed embedded pipe and the first prestressed embedded pipe in sequence and is anchored to the top of the cap, thereby connecting the cap and the concrete pile into a whole;

[0019] S4: hoist the prefabricated pier and adjust the angle, place the prefabricated pier on the cap, insert the reserved steel bars in the cap into the semi-grouting sleeve of the prefabricated pier, then lay a high-strength mortar base layer on the bottom of the prefabricated pier, and then inject grouting material into the semi-grouting sleeve, so as to anchor the longitudinal steel bars and the reserved steel bars in the semi-grouting sleeve, and the on-site construction is completed.

[0020] Beneficial effects: Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1) A new type of prefabricated pier connection structure is proposed to avoid damage to the prefabricated piers themselves; at the same time, prestressed self-reset measures are used to make the foundation sway controllable, avoiding the risk of the prefabricated piers swaying out of control and thus overturning and collapsing as a whole.

[0022] 2) A prefabricated steel corbel connection scheme is proposed. The steel corbel structure on the concrete pile column can be flexibly arranged to make the overall steel corbel structure of the foundation symmetrical and balanced in force, taking into account practical rationality and economy. The layout of the steel corbel structure can be freely designed and changed, which increases the selectivity of the construction plan and better meets the construction needs of different sites.

[0023] 3) The symmetrical arrangement of the steel bracket structure can provide self-reset constraints on the prefabricated bridge piers in both the longitudinal and transverse directions of the bridge. Under different seismic wave incident angles, the prefabricated bridge piers can self-reset and swing.

[0024] 4) The present invention adopts a prefabricated assembly manufacturing and construction scheme, which is easy to install, can speed up the construction progress, reduce environmental impact, increase the speed of bridge construction, and at the same time ensure excellent earthquake resistance and post-earthquake repairability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure after deformation of the present invention;

[0027] Figure 3 For the present invention Figure 1 Middle AA section;

[0028] Figure 4 For the present invention Figure 1 Middle BB cross section;

[0029] Figure 5 This is a schematic diagram of the connection between the steel corbel structure and the pile column of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the steel bracket structure flexibly arranged in the present invention when encountering earthquake action;

[0031] Figure 7 This is a schematic diagram of the flexible arrangement of steel bracket structures in the six-pile foundation of the present invention;

[0032] In the figure: 1. Prefabricated bridge pier; 2. Capping platform; 3. Concrete pile column; 4. Steel corbel structure; 5. Unbonded prestressed tendons; 6. Semi-grouting sleeve; 7. High-strength mortar seat layer; 8. Reserved groove; 9. Protective pad; 10. First prestressed embedded pipe; 11. Second prestressed embedded pipe; 12. Bolt insertion hole; 13. Bolt; 14. Lower end plate; 15. Middle connecting plate; 16. Upper end plate. DETAILED DESCRIPTION

[0033] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, a prefabricated assembled pier connection structure and a construction method thereof, the main structure of the invention includes: an assembled pier 1, a cap 2, a concrete pile 3, and a steel corbel structure 4; a reserved groove 8 connected to the concrete pile 3 is reserved at the bottom of the cap 2, a first prestressed embedded pipe 10 is reserved inside the cap 2, the concrete pile 3 is provided with a steel corbel structure 4, a second prestressed embedded pipe 11 is reserved inside the steel corbel structure 4, and an unbonded prestressed tendon 5 is used to connect the cap 2 and the steel corbel structure 4.

[0035] like Figure 1 and Figure 2As shown, the prefabricated pier 1 is connected to the cap 2 through a semi-grouting sleeve 6, and a high-strength mortar base layer 7 is provided at the bottom of the prefabricated pier 1; the concrete pile 3 is symmetrically provided with four steel corbel structures 4, and the steel corbel structure 4 is connected to the concrete pile 3 through bolts 13; the top of the concrete pile 3 is inserted into the reserved groove 8 at the bottom of the cap 2, and the cap 2 is connected to the steel corbel structure 4 through unbonded prestressed tendons 5.

[0036] like Figure 1 , Figure 2 and Figure 4 As shown, the steel corbel structure 4 is a solid steel thick plate, including an upper end plate 16, an intermediate connecting plate 15 and a lower end plate 14; the lower end plate and the upper end plate of the steel corbel structure are both provided with a row of bolt through holes 12, and the contact surfaces between the steel corbel and the pile column are both arc surfaces that fit the concrete pile column.

[0037] The spacing between the bolt holes 12 of the steel corbel structure shall not be less than one hole diameter, and the distance between the bolt holes 12 and the two end boundaries of the contact surface shall not be less than one hole diameter. All the bolt holes 13 on the contact surface of the lower end plate or upper end plate of each steel corbel structure 4 are located on the same axis, so that the bolts 13 can effectively play an anchoring role.

[0038] like Figure 5 As shown, the concrete pile column 3 and the steel corbel structure 4 are processed and connected at the construction site. The steel corbel structure 4 is anchored on the concrete pile column 3 by bolts 13. When the design requires stronger shear bearing capacity, high-strength glue can also be used to fix the contact surface of the steel corbel structure 4 and the concrete pile column 3. The steel corbel structure 4 and the bolts 13 are both independent prefabricated components and are close to the ground. They are easy to repair and replace in case of damage or rust. The embedding depth of the concrete pile column 3 in the reserved groove 8 is 0.5 times the diameter of the concrete pile column. The steel corbel structure 4 is located at a height of 2 times the pile diameter from the top surface of the concrete pile column 3 in contact with the pedestal 2, and the steel corbel structure is no more than 2 times the pile diameter from the ground. This makes it easy for the pedestal 2 to be lifted and swung during an earthquake, thereby achieving the effect of sway isolation.

[0039] like Figure 1 and Figure 3 As shown, a protective pad 9 is arranged on the top of the concrete pile column 3, which surrounds the pile head and is fixed with high-strength glue; the diameter of the reserved groove 8 at the bottom of the cap 2 is slightly larger than the diameter of the concrete pile column 3, the top of the concrete pile column 3 is inserted into the groove of the cap 2, and the gap is filled with elastic materials such as rubber; the embedding depth of the concrete pile column 3 in the reserved groove 8 at the bottom of the cap is 0.5 times the pile diameter, and the embedding depth can be adjusted according to the actual design; there is no bonding between the concrete pile column 3 and the cap 2, and between the protective pad 9 and the reserved groove 8, so that the cap can be freely lifted and swung under the action of an earthquake.

[0040] like Figure 1and Figure 4 As shown, the pedestal 2 is provided with a first prestressed embedded pipe 10, the middle connecting plate 15 of the steel corbel structure 4 is provided with a second prestressed embedded pipe 11, the unbonded prestressed tendons 5 are inserted in the pedestal 2 and the steel corbel structure 4, and the unbonded prestressed tendons are connected in a straight line; the unbonded prestressed tendons 5 are arranged one-to-one with the steel corbel structure 4 on the concrete pile column 3; the unbonded prestressed tendons 5 arranged on each concrete pile column 3 of the pier foundation are parallel, the lower end of the unbonded prestressed tendons 5 is anchored on the steel corbel structure 4, and the upper end is tensioned and anchored on the top of the pedestal 2, the unbonded prestressed tendons 5 can effectively prevent the sliding and dislocation of the pedestal 2 during the swinging process, prevent the nonlinear behavior of the pier itself, and reduce the displacement of the bridge deck during an earthquake, while providing a self-resetting function when the pier and the foundation swing.

[0041] The number and position of the steel corbel structure 4 can be flexibly determined according to the number and arrangement of the concrete piles 3. The arrangement of the steel corbel structure 4 can be freely designed and changed under the premise of ensuring the symmetrical arrangement of the steel corbel structure 4, so that the structure can be subjected to the self-resetting effect of the unbonded prestressed tendons 5 under the action of bidirectional earthquakes. Figure 6 As shown, when the pedestal 2 is a four-pile pedestal, it is not necessary to arrange four steel corbel structures 4 on each concrete pile 3. It is only necessary to arrange two steel corbel structures 4 on the outside of each concrete pile 3, so that the entire foundation forms a symmetrically distributed whole of the steel corbel structures 4. When subjected to horizontal bidirectional earthquake action, the bridge can be acted upon by the unbonded prestressed tendons 5 in both the longitudinal and transverse directions of the bridge.

[0042] like Figure 7 As shown, when the pedestal 2 is a six-pile pedestal, two steel corbel structures 4 are arranged on the surrounding piles toward the outside of the foundation, and only one steel corbel structure 4 is arranged on the outside of the middle pile, so that the entire foundation can still form a symmetrically distributed steel corbel structure as a whole. When subjected to horizontal bidirectional earthquake action, the bridge can be acted upon by unbonded prestressed tendons 5 in both the longitudinal and transverse directions of the bridge.

[0043] The working principle of the present invention is:

[0044] When an earthquake strikes, Figure 2As shown in the figure, since the cap 2 and the concrete pile column 3 are not consolidated, under the action of earthquake force, the cap 2 and the concrete pile column 3 will produce relative displacement, lift up and swing, thereby dissipating the earthquake energy, and the assembled bridge pier 1 itself does not develop large inelastic displacement, thereby effectively reducing the damage to the bridge pier column. The swing between the cap 2 and the concrete pile column 3 effectively prevents part of the earthquake energy from being transmitted to the upper structure, so that the main body of the bridge structure above the cap 2 is subjected to less force during the earthquake. At the same time, since the unbonded prestressed tendons 5 connected to the steel bracket structure 4 of the cap 2 and the concrete pile column 3 provide tension when the cap 2 is lifted, the lift and swing between the concrete pile column 3 and the cap 2 do not exceed a certain limit, so that the displacement of the bridge deck can be controlled within the set range, avoiding the cap 2 from swinging too much and causing overturning and collapse. The unbonded prestressed tendons 5 provide a self-reset function when the bridge pier and foundation swing, which can limit the maximum displacement and permanent residual displacement of the bridge deck during the earthquake, greatly improving the seismic performance of the bridge substructure, and effectively improving the repairability of the bridge after the earthquake. When the earthquake load exceeds the unbonded prestressed tendons 5, the unbonded prestressed tendons 5 are damaged before the piers yield or suffer serious damage, so that the prestressed tendons have the function of a "fuse", providing the first line of defense for the bridge substructure under earthquakes; at the same time, the unbonded prestressed tendons 5 are anchored at the top of the pedestal 2 and the steel bracket structure 4 at a short distance from the ground, so that they are easy to maintain and replace after earthquake damage. At the same time, the present invention adopts a steel bracket connection scheme, which can flexibly arrange the prestressed tendons according to the actual pile column arrangement. When the brackets are symmetrically arranged, they can provide self-reset effects in the longitudinal and transverse directions of the bridge, thereby improving the seismic performance and post-earthquake repairability of the bridge structure; the patent of the present invention combines prefabricated piers, flexibly arranged steel bracket structures, the self-reset function of post-tensioned prestressed tendons and foundation swing technology, which speeds up the construction progress of the bridge, reduces environmental impact, and improves the seismic performance and post-earthquake repairability of the bridge structure, thereby improving the development level of bridge seismic toughness.

[0045] Finally, it should be noted that this embodiment is only used to illustrate the technical solution of the present invention and is not intended to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which are all covered by the scope of the claims of the present invention.

Claims

1. A prefabricated assembled bridge pier connection structure, characterized in that: The connection structure comprises an assembled bridge pier (1), wherein a plurality of semi-grouting sleeves (6) are arranged inside the assembled bridge pier (1), and the plurality of semi-grouting sleeves (6) are used to connect the longitudinal steel bars in the assembled bridge pier (1) and the reserved steel bars in the cap (2), and a high-strength mortar base layer (7) is also laid at the contact portion between the assembled bridge pier (1) and the cap (2), and a plurality of concrete piles (3) are contact-connected below the cap (2), and a plurality of steel bracket structures (4) are arranged on the plurality of concrete piles (3), and unbonded prestressed tendons (5) are arranged on the plurality of steel bracket structures (4), and the other ends of the plurality of unbonded prestressed tendons (5) penetrate the cap (2) and are anchored to the top of the cap (2); The bottom of the cap (2) is provided with a plurality of reserved grooves (8), the upper part of the concrete pile (3) is embedded in the reserved grooves (8), and the pile head is wrapped with a protective pad (9), the diameter of the reserved groove (8) is greater than the diameter of the concrete pile (3), and an elastic material for buffering is also provided in the space formed by the difference between the diameter of the reserved groove (8) and the diameter of the concrete pile (3), and the embedding depth of the concrete pile (3) in the reserved groove (8) is 0.5 times the diameter of the soil pile; The steel bracket structure (4) comprises an upper end plate (16) and a lower end plate (14), an intermediate connecting plate (15) is further provided between the upper end plate (16) and the lower end plate (14), a plurality of bolt insertion holes (12) are provided on the upper end plate (16) and the lower end plate (14), the steel bracket structure (4) is connected to the concrete pile column (3) by bolts (13) through the plurality of bolt insertion holes (12), and the upper end plate (16), the lower end plate (14) and the intermediate connecting plate (15) are all made of solid steel thick plates; The contact parts of the upper end plate (16), the lower end plate (14) and the concrete pile column (3) are all coated with high-strength glue; The bolt through holes (12) are evenly distributed on the upper end plate (16) and the lower end plate (14), and the distance between two adjacent bolt through holes (12) is not less than one times of their own hole diameters; the distance between the bolt through holes (12) at both ends of the upper end plate (16) and the two ends of the upper end plate (16) is not less than one times of their own hole diameters; the distance between the bolt through holes (12) at both ends of the lower end plate (14) and the two ends of the lower end plate (14) is not less than one times of their own hole diameters; the positions of the bolt through holes (12) on the upper end plate (16) and the lower end plate (14) correspond to each other; A plurality of first prestressed pre-buried pipes (10) are arranged in the cap (2); a second prestressed pre-buried pipe (11) is arranged below each of the first prestressed pre-buried pipes (10) and on the intermediate connecting plate (15); one end of the unbonded prestressed tendon (5) is arranged on the lower side of the intermediate connecting plate (15), and the other end thereof passes through the second prestressed pre-buried pipe (11) and the first prestressed pre-buried pipe (10) in sequence and is anchored to the top of the cap (2); The concrete piles (3) located at the four corners of the cap (2) are each provided with two of the steel bracket structures (4) away from the center of the cap (2) and outwardly, and the remaining concrete piles (3) are each provided with one of the steel bracket structures (4) away from the center of the cap (2) and outwardly,; When the number of the concrete piles (3) is four, the four concrete piles (3) are each provided with two steel bracket structures (4) away from the center of the cap (2); when the number of the concrete piles (3) is six, the concrete piles (3) located at the four corners of the cap (2) are each provided with two steel bracket structures (4) away from the center of the cap (2), and the two concrete piles (3) located in the middle of the cap (2) are each provided with one steel bracket structure (4) away from the center of the cap (2).

2. The construction method of a prefabricated assembled bridge pier connection structure according to claim 1, characterized in that: The following steps are involved: S1: Prefabricated components: including prefabricating the assembled bridge pier (1), and then anchoring the lower end of the longitudinal steel bar in the semi-grouting sleeve (6); prefabricating the cap (2), and providing the reserved groove (8) at the bottom of the cap (2); prefabricating the steel bracket structure (4), and providing the bolt insertion holes (12) on the lower end plate (14) and the upper end plate (16); prefabricating the concrete pile column (3), and providing screw holes matching the bolt insertion holes (12) on the concrete pile column (3); S2: Bottom construction: firstly, excavate the foundation, then press the concrete pile column (3) into the soil, and reserve space for installing the steel bracket structure (4), then fix the steel bracket structure (4) on the concrete pile column (3) by bolts (13), and fix the protection pad (9) around and wrap it on the pile head of the concrete pile column (3) with high-strength glue; finally, hoist the cap (2) and adjust the angle so that the pile head of the concrete pile column (3) is inserted into the reserved groove (8); S3: installing the unbonded prestressed tendons: anchoring one end of the unbonded prestressed tendons (5) at the lower end of the second prestressed pre-buried pipe (11) and below the intermediate connecting plate (15), and the other end of the unbonded prestressed tendons (5) sequentially passing through the second prestressed pre-buried pipe (11) and the first prestressed pre-buried pipe (10) and anchoring at the top of the cap (2), thereby connecting the cap (2) and the concrete pile column (3) into a whole; S4: The assembled pier (1) is hoisted and the angle is adjusted, and the assembled pier (1) is placed on the cap (2). The reserved steel bars in the cap (2) are inserted into the semi-grouting sleeve (6) of the assembled pier (1). Then, a high-strength mortar base layer (7) is laid at the bottom of the assembled pier (1), and then grouting material is injected into the semi-grouting sleeve (6), so that the longitudinal steel bars and the reserved steel bars are anchored in the semi-grouting sleeve (6), and the on-site construction is completed.

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