A kind of repair bridge pier based on scalable pier body

Abstract

The application relates to a kind of rescue bridge piers based on scalable pier body, N section tubular pier body, N is greater than or equal to 2 positive integer, the last section pier body is sleeved in the next section pier body adjacent thereto;Lifting drive mechanism is used to drive the pier body above the first section pier body vertically to realize the rescue bridge pier expansion and contraction;Limiting guide mechanism for expansion and contraction movement is arranged between the two adjacent section pier bodies, and the positioning connection mechanism for fixing the last section pier body with the next section pier body after being lifted to the preset position is arranged.The application solves the technical problem of slow speed of existing railway rescue bridge pier assembly erection, and improves the traffic speed of the rescued bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge emergency repair technology, and in particular to an emergency repair pier with a retractable pier body. Background Technology

[0002] my country has a large number of railway bridges, which are widely distributed and account for a large proportion of the total. They may be damaged in the event of natural disasters and are also key targets of enemy attacks in wartime. Therefore, the rapid repair of damaged bridges is a key research topic in the field of transportation emergency support.

[0003] The existing standard emergency repair bridge piers have a single structural form, which is a steel tower pier with multiple rows of columns and connecting systems (such as the Chinese invention patent application with publication number CN104894955A entitled "A Steel Pier for Emergency Repair of High-Speed ​​Railway"). The on-site assembly work is large and complicated, requiring the cooperation of large lifting equipment. The assembly speed is slow, the bolt hole gap is large, the pier top displacement is large, the lateral stiffness is poor, and the overall integrity is poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an integrally deployable emergency repair pier, which solves the technical problem of slow assembly and erection speed of existing railway emergency repair piers, and at the same time improves the speed of opening the repaired bridge to traffic.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A key technology of an emergency repair bridge pier based on a retractable pier body includes:

[0007] N tubular pier sections, where N is a positive integer greater than or equal to 2. The bottom section is the first pier section, and the top section is the Nth pier section. Each pier section is nested within the next adjacent pier section.

[0008] The lifting drive mechanism is used to drive the vertical lifting of the pier body above the first pier section to realize the expansion and contraction of the bridge pier during emergency repairs.

[0009] The bottom of the first pier section is provided with a flange plate for fixing the pier under emergency repair, and the top of the Nth pier section is provided with a flange plate for connecting the bridge.

[0010] A limiting and guiding mechanism for telescopic movement is installed between two adjacent pier sections, and

[0011] A positioning and connection mechanism used to fix the previous pier section to the next pier section after it has been raised to a preset position.

[0012] As one embodiment of the present invention, the limiting and guiding mechanism includes several sets of vertically continuous internal stiffening ribs disposed on the inner wall of the first to N-1th pier sections, and several sets of vertically continuous external stiffening ribs disposed on the outer wall of the second to Nth pier sections, wherein the external stiffening ribs of the pier section above and the internal stiffening ribs of the pier section below are adapted to each other.

[0013] In one embodiment of the present invention, each set of external stiffening ribs consists of two parallel vertical plates, and each set of internal stiffening ribs consists of a vertical rib plate with a cross-section in the shape of an "[". The open end of the "[" shaped vertical rib plate is fixedly connected to the inner wall of the pier body, and the internal stiffening rib of the next pier body is inserted into the external stiffening rib of the previous pier body.

[0014] In one embodiment of the present invention, the positioning connection mechanism between the topmost Nth pier section and the adjacent N-1th pier section is an adjustable positioning connection mechanism, so that the extension height of the Nth pier section can be adjusted to meet the emergency repair needs of different pier heights.

[0015] In one embodiment of the present invention, the adjustable positioning connection mechanism comprises a plurality of first connecting parts disposed on the top of the N-1th pier section and a second connecting part vertically extending along the outer wall of the Nth pier section. The first connecting parts and the second connecting parts are adapted to each other, and a plurality of bolt holes are provided at equal intervals on the first connecting parts and the second connecting parts. The first connecting parts and the second connecting parts are fixedly connected by bolts.

[0016] As one embodiment of the present invention, the lifting drive mechanism includes multiple winches installed on the outer wall of the first pier section, and multiple steel wire ropes respectively fixedly installed at the bottom of the second to Nth pier sections.

[0017] The second to Nth sections of the pier are raised one by one to a preset position and fixed by pulling the wire rope with the winch, or

[0018] After the second to N-1 pier sections are simultaneously raised to the preset position and fixed, the winch pulls the Nth pier section to the preset position and fixes it.

[0019] In one embodiment of the present invention, the wire rope on the second pier section passes over the fixed pulley fixedly installed at the top of the first pier section and is connected to the corresponding winch. The wire ropes on the third to N-1th pier sections pass over the fixed pulley fixedly installed at the top of the next pier section and are fixedly connected to the top of the next pier section after that, where N≥4. When the winch is working, the second to N-1th pier sections rise and fall synchronously. After the second to N-1th pier sections rise synchronously to the preset position and are fixed, the connection between the wire rope on the second pier section and the winch is released. The wire rope on the Nth pier section passes over the fixed pulley fixedly installed at the top of the N-1th pier section and is connected to the winch. The winch pulls the Nth pier section up to the preset position and is fixed.

[0020] In one embodiment of the present invention, the positioning and connecting mechanism includes a bottom flange plate disposed on the outer circumference of the bottom of the upper pier section and a top flange plate disposed on the inner circumference of the top of the lower pier section. The bottom flange plates and top flange plates of two adjacent pier sections are adapted to each other and are fixedly connected by bolts.

[0021] In one embodiment of the present invention, the emergency repair pier is filled with structural material to form a composite structure as a permanent pier.

[0022] In one embodiment of the present invention, an inflatable core mold is set within a certain height range inside the emergency repair pier, and a hollow pier is formed after being filled with structural materials.

[0023] In one embodiment of the present invention, the cross-section of the tubular pier is circular, rectangular, or regular polygonal.

[0024] In one embodiment of the present invention, the bridge pier for emergency repair is made of lightweight, high-strength metal material.

[0025] An emergency repair bridge pier column includes 2-4 emergency repair bridge piers as described above, with the 2-4 emergency repair bridge piers arranged closely to form the emergency repair bridge pier column.

[0026] The beneficial effects of adopting the above technical solution are as follows:

[0027] The emergency repair pier based on a retractable pier body provided by this invention has a simple structure, fewer components, and high assembly efficiency. The components constituting the pier body have large cross-sections and are few in number. Through precise guidance and flange connections, the displacement of the pier top is significantly reduced, the lateral stiffness of the pier is improved, and the speed of traffic on the bridge being repaired is increased. It extends into place by its own mechanism, eliminating the need for large lifting machinery for installation, thus improving repair efficiency compared to existing bridge pier repair equipment assembled using derricks or cranes. The emergency repair pier is stored in a retracted, stacked state and extended in a working state, saving storage space and facilitating transportation and assembly compared to existing bridge pier repair equipment.

[0028] Bridge pier damage often occurs in valleys and rivers, where large machinery cannot or cannot quickly reach the repair site. This invention extends into place using its own mechanism, eliminating the need for large lifting machinery for installation, thus broadening its applicability.

[0029] This system effectively combines temporary repairs to bridge piers with permanent functionality. Previously, existing emergency repair equipment for bridge piers required dismantling the equipment before constructing permanent piers, disrupting normal traffic flow and resulting in poor economic returns. Deployable repair piers with extendable bodies, after being filled with concrete or other structural materials, can be transformed into permanent piers. A single equipment system enables both temporary repairs and permanent functional restoration of bridge piers. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention (sections two and three are slightly extended).

[0031] Figure 2 This is a schematic diagram of the top partial structure of Embodiment 1 of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the first pier section of Embodiment 1 of the present invention.

[0033] Figure 4 yes Figure 3 A magnified schematic diagram of part A in the middle.

[0034] Figure 5 This is a structural schematic diagram of the second pier section of Embodiment 1 of the present invention.

[0035] Figure 6 This is a schematic diagram of the top partial structure of the second pier section of the present invention, according to Embodiment 1 of the present invention.

[0036] Figure 7 This is a schematic diagram of the topmost pier of Embodiment 1 of the present invention.

[0037] Figure 8 This is a schematic diagram of the plan layout of a single-column pier (a single emergency repair pier).

[0038] Figure 9 This is a schematic diagram of the plan layout of the double-column piers (two emergency repair piers).

[0039] Figure 10 This is a schematic diagram of the plan layout of the double-column piers (an array of multiple emergency repair piers).

[0040] Figure 11 This is a schematic diagram of the plan layout of a single-column pier (an array of multiple emergency repair piers).

[0041] in:

[0042] 1-First pier section; 11-First internal stiffening rib; 12-First bottom flange plate; 13-First bottom stiffening plate; 14-First top flange plate; 15-First top stiffening plate; 16-First fixed pulley;

[0043] 2-Second pier section; 21-Second internal stiffening rib; 22-Second external stiffening rib; 23-Second bottom flange plate; 24-Second bottom stiffening plate; 25-Second wire rope; 26-Second fixed pulley;

[0044] 3-Third pier section; 31-Third external stiffening rib; 32-Third bottom flange plate; 33-Third top flange plate; 34-Third top stiffening plate; 35-Third wire rope;

[0045] 4-Winding machine;

[0046] 100 - Bridge pier for emergency repair; 200 - Pier cap. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the invention will be described clearly and completely below in conjunction with specific embodiments.

[0048] Example 1

[0049] like Figure 1 and Figure 2 The diagram illustrates a repair pier based on a retractable pier body, comprising three tubular pier sections and a lifting drive mechanism. The bottom section is the first pier section 1, and the top section is the third pier section 3. Each pier section is fitted inside the adjacent next pier section; that is, the second pier section 2 is fitted inside the first pier section 1, and the third pier section 3 is fitted inside the second pier section 2. The three pier sections are coaxial. The cross-section of the tubular pier body is circular, rectangular, or a regular polygon. This embodiment uses a circular structure. The repair pier is made of lightweight, high-strength metal material, preferably aluminum alloy; steel can also be used.

[0050] The lifting drive mechanism is used to drive the pier body above the first pier body to rise and fall vertically to realize the expansion and contraction of the bridge pier for emergency repair; in this embodiment, the lifting drive mechanism drives the second pier body 2 and the third pier body 3 to rise and fall.

[0051] like Figure 3 As shown, the bottom of the first pier section 1 is provided with a first bottom flange plate 12 for fixing the emergency repair pier. Several first bottom stiffening plates 13 are distributed between the first bottom flange plate 12 and the first pier section 1. The first bottom flange plate 12 is provided with bolt holes, and the first bottom flange plate 12 is fixedly connected to the pier cap or the remaining pier by bolts, so as to fix the entire emergency repair pier.

[0052] like Figure 2 and7 As shown, the top of the third pier section is provided with a third top flange plate 33 for connecting the bridge; the third top flange plate 33 can be directly rigidly connected to the beam structure, or rigidly connected to the pier cap structure, or connected to the beam structure through a support. Several third top stiffening plates 34 are distributed between the third top flange plate 33 and the outer wall of the third pier section 1.

[0053] The retractable pier for emergency repair described in this invention includes a limit guide mechanism between adjacent pier sections to ensure smooth lifting and lowering of each section. The retractable pier also includes a positioning connection mechanism for fixing one pier section to the next after it has been raised to a preset position, thus securing the pier section after it has been raised.

[0054] The limiting and guiding mechanism includes several sets of vertically continuous internal stiffening ribs arranged on the inner wall of the first to N-1th pier sections, and several sets of vertically continuous external stiffening ribs arranged on the outer wall of the second to Nth pier sections. The external stiffening ribs of the pier section above and the internal stiffening ribs of the pier section below are adapted to each other and are in a clearance fit.

[0055] Specifically, see Figure 2-7 As shown, in this embodiment, the inner walls of the first pier section 1 and the second pier section 2 are respectively provided with several sets of vertically continuous first internal stiffening ribs 11 and second internal stiffening ribs 21, which are evenly distributed along the circumference. The outer walls of the second pier section 2 and the third pier section 3 are respectively provided with several sets of vertically continuous second external stiffening ribs 22 and third external stiffening ribs 31.

[0056] Each set of external stiffening ribs (22, 31) consists of two parallel vertical plates, and each set of internal stiffening ribs (11, 21) consists of a vertical rib plate with a cross-section in the shape of an "[". The open end of the "[" shaped vertical rib plate is fixedly connected to the inner wall of the pier body. The internal stiffening ribs of the next pier section are inserted into the external stiffening ribs of the previous pier section. That is, each set of first internal stiffening ribs 11 is inserted between the two vertical plates of the corresponding set of second external stiffening ribs 22; each set of second internal stiffening ribs 21 is inserted between the two vertical plates of the corresponding set of third external stiffening ribs 31, and so on when N is greater than 3.

[0057] As an equivalent alternative, the internal stiffening ribs (11, 21) and external stiffening ribs (22, 31) can also adopt other cross-sectional forms to replace the [type vertical rib plate - two parallel vertical flat plate guide structures].

[0058] By installing longitudinal stiffening ribs on the inner and outer walls of the pier, the bearing capacity of the pier during emergency repairs can be effectively improved, preventing local instability of the pier body during temporary repairs. This embodiment utilizes the aforementioned longitudinal stiffening rib structure, which also serves as a guiding mechanism, achieving a dual benefit.

[0059] The positioning connection mechanism between the topmost Nth pier section and the adjacent (N-1)th pier section is an adjustable positioning connection mechanism, allowing the extension height of the Nth pier section to be adjusted to meet the emergency repair needs of different pier heights. Further, the adjustable positioning connection mechanism consists of several first connecting parts located at the top of the (N-1)th pier section and a second connecting part vertically extending along the outer wall of the Nth pier section. The first and second connecting parts are compatible, and each has a plurality of bolt holes evenly spaced on it. The first and second connecting parts are fixedly connected by bolts. Specifically, in this embodiment, see... Figure 2 , 5 As shown in Figure 7, the second internal stiffening rib 21 of the second pier body 2 extends upward beyond the top of the second pier body 2 to form the first connecting part. Several bolt holes are provided at equal intervals on both sides of the first connecting part (the part of the second internal stiffening rib 21 extending upward beyond the top of the second pier body 2). The third external stiffening rib 31 on the third pier body 3 is the second connecting part, and several bolt holes adapted to the first connecting part are provided at equal intervals on it. When the third pier body 3 is raised to the preset height, the third pier body 3 is fixed in position by bolts provided on the first connecting part and the second connecting part.

[0060] In another embodiment, the first connecting part of the adjustable positioning connecting mechanism is a plurality of connecting plates fixedly installed on the top of the second pier section 2, and the second connecting part is a plurality of vertically extending connecting plates installed on the outer wall of the third pier section 3. The connecting plates on the second pier section 2 and the connecting plates on the outer wall of the third pier section 3 are adapted to each other and connected by bolts.

[0061] like Figures 3 to 5As shown in this embodiment, the positioning and connecting mechanism provided between the first pier section 1 and the second pier section 2 includes a second bottom flange plate 23 disposed on the outer circumference of the bottom of the second pier section 2 and a first top flange plate 14 disposed on the inner circumference of the top of the first pier section 1. The second bottom flange plate 23 and the first top flange plate 14 are adapted to each other. When the second pier section 2 is raised to the top, the second bottom flange plate 23 and the first top flange plate 14 are fixedly connected by bolts to fix the position of the second pier section 2. A plurality of first top stiffening plates 15 are provided between the first top flange plate 14 and the inner wall of the first pier section 1; a plurality of second bottom stiffening plates 24 are provided between the second bottom flange plate 23 and the outer wall of the second pier section 2. The first top stiffening plates 15 are located on the upper side of the first top flange plate 14, and the second bottom stiffening plates 24 are located on the lower side of the second bottom flange plate 23, so that the lower end surface of the first top flange plate 14 is flat and the upper end surface of the second bottom flange plate 23 is flat, so that the two can be connected.

[0062] like Figure 3 As shown, since the inner wall of the first pier section 1 is simultaneously provided with first internal stiffening ribs 11 and first top flange plates 14, and both are circumferentially distributed, the first top flange plates 14 are multiple discontinuous flange plates, each of which is placed in the gap formed between two adjacent first internal stiffening ribs 11. Similarly, when N≥4, the inner walls of other pier sections are also simultaneously provided with internal stiffening ribs and top flange plates, then... Figure 3 The first internal stiffening rib 11 and the first top flange plate 14 of the first section of the pier body 1 shown are configured in the same way.

[0063] like Figure 5 As shown, the outer wall of the second pier section 2 is simultaneously provided with second external stiffening ribs 22 and second bottom flange plates 23, both of which are circumferentially distributed. Therefore, the second bottom flange plates 23 are multiple discontinuous flange plates, each placed in the gap formed between two adjacent second external stiffening ribs 22. Similarly, when N≥4, the outer walls of other pier sections are also simultaneously provided with stiffening ribs and bottom flange plates, thus... Figure 5 The second external stiffening rib 22 and the second bottom flange plate 23 of the second section of the pier body 2 shown are configured in the same way.

[0064] like Figure 1As shown, in this embodiment, the lifting drive mechanism includes two winches 4 installed on the outer wall of the first pier section, and multiple steel wire ropes (25, 35) respectively fixed at the bottom of the second pier section 2 and the third pier section 3; the winches pull the steel wire ropes to raise the second to Nth pier sections one by one to a preset position for fixing, or the second to N-1th pier sections are raised to a preset position for fixing simultaneously, and then the winches pull the Nth pier section to a preset position for fixing.

[0065] Specifically, such as Figure 1 and 2 As shown, the emergency repair pier in this embodiment has three sections, i.e., N is 3. The second steel wire rope 25 on the second pier section 2 passes around the first fixed pulley 16 fixed at the top of the first pier section 1 and connects to the corresponding winch 4. The third steel wire rope 35 on the third pier section 3 passes around the second fixed pulley 26 fixed at the top of the second pier section 2 and connects to the winch 4 on the corresponding side. Since the emergency repair pier has three sections, and the height of the third pier section 3 needs to be adjusted according to the actual situation, the second pier section 2 and the third pier section 3 need to be raised one by one. After the second pier section 2 is raised to the preset position and fixed, the connection between the second steel wire rope 25 on the second pier section 2 and the winch 4 is released. The third steel wire rope 35 on the third pier section 3 passes around the second fixed pulley 26 and connects to the winch 4. The winch 4 pulls the third pier section 3 up to the preset position and then fixes it.

[0066] To ensure the smooth lifting of the third section of the pier 3, the second wire rope 25 can be pulled to one side to detach it from the first fixed pulley 16. The third wire rope 35 first passes through the second fixed pulley 26 and then through the outer rope groove of the first fixed pulley 16 to connect with the winch 4.

[0067] like Figures 3 to 5 As shown, the bottom end of the second wire rope 25 is fixedly connected to the middle of the second bottom flange plate 23, and the second wire rope 25 extends upward through the bolt hole in the corresponding position of the first top flange plate 14. This structure makes reasonable use of the gap between the first and second pier sections, avoiding interference between the second wire rope 25 and other structures.

[0068] Once the aforementioned emergency repair piers are raised to the preset height and fixed, they can serve as temporary piers to bear temporary traffic loads. Subsequently, as needed, structural materials can be filled inside the emergency repair piers without interrupting traffic, transforming the temporary piers into composite structures that can be used as permanent piers. The structural material can be concrete.

[0069] As a preferred option, before injecting the internal filling material, an inflatable core mold is set within a certain height range inside the emergency repair pier, and after filling with structural materials, a hollow pier is formed.

[0070] Example 2

[0071] In this embodiment, N is 2, meaning that the entire emergency repair pier consists of two sections (not shown in the figure). The difference between the structure of the first section of the pier and that of the first section of the pier in Embodiment 1 is that the first internal stiffening rib 11 on its inner wall extends upward beyond the top of the first section of the pier to form the first connecting part; the third section of the pier serves as the second section of the pier and is adapted to the first section of the pier.

[0072] In this embodiment, since the (N-1)th pier section is actually the first pier section, and the first pier section is fixed and does not move up or down, the winch can simply lift the second pier section to the pre-approval position using a wire rope and then fix it using the first and second connecting parts.

[0073] Example 3

[0074] In this embodiment, N is a positive integer greater than or equal to 4, meaning the entire emergency repair pier consists of at least 4 pier sections (not shown in the figure). The steel wire ropes on the third to N-1th pier sections are routed around a fixed pulley at the top of the next pier section and then fixedly connected to the top of the next pier section after that, where N≥4. When the winch is working, the second to N-1th pier sections rise and fall synchronously. After the second to N-1th pier sections rise to a preset position and are fixed, the steel wire rope on the second pier section is disconnected from the winch. The steel wire rope on the Nth pier section is routed around the fixed pulley at the top of the N-1th pier section and connected to the winch. The winch pulls the Nth pier section up to the preset position and fixes it. In other words, in this embodiment, except for the first pier section which remains stationary and the topmost Nth pier section which is lifted separately, the pier sections between the first and Nth sections rise and fall synchronously.

[0075] Taking N=4 as an example, the steel wire rope on the third pier section passes over the fixed pulley at the top of the second pier section and is then fixedly connected to the top of the first pier section. The steel wire rope on the second pier section passes over the fixed pulley at the top of the first pier section and is then connected to the winch. When the winch is working, the second pier section is lifted, and the fixed pulley at the top of the second pier section rises synchronously. The steel wire ropes on both sides of the fixed pulley have a length difference, which pulls the bottom of the third pier section, causing the third pier section to rise, thus making the second and third pier sections rise and fall synchronously. After the second and third pier sections have risen synchronously to the preset position and are fixed, the connection between the steel wire rope on the second pier section and the winch is released. The steel wire rope on the fourth pier section passes over the fixed pulley at the top of the third pier section and is then connected to the winch. The winch pulls the fourth pier section up to the preset position and is then fixed.

[0076] In another implementation, the wire rope on the third pier body passes over the fixed pulleys fixed at the top of the second pier body and the top of the first pier body, and then forms a single wire rope with the wire rope on the second pier body, which is then connected to the winch.

[0077] Example 4

[0078] like Figures 8 to 11 As shown in the figure, this embodiment discloses an emergency repair bridge pier, which includes one or more emergency repair bridge piers as described in any one of Embodiments 1 to 3. The emergency repair bridge pier can be designed and stocked with various different models and specifications to meet the emergency repair needs of different pier heights.

[0079] The emergency repair pier described in this invention comprises at least two pier sections, the dimensions of which can be as follows: two telescopic pier sections are used when the pier height is below 10m, three pier sections are used when the height is between 10-30m, and four or more pier sections are used when the height is above 30m. The diameter of the first pier section is D, which commonly ranges from 1.0 to 2.5m. Single and double columns (a single emergency repair pier or two emergency repair piers forming a single pier) can accommodate pier heights below 10m, while double columns (two emergency repair piers forming a single pier) can accommodate pier heights below 20m. Emergency repair of taller piers can be achieved by arranging two sets of emergency repair pier arrays or densely packed emergency repair piers. The upper part of the emergency repair pier can be directly rigidly connected to the beam structure, or it can be connected to the beam structure through supports, or rigidly connected to the pier cap.

[0080] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bridge pier for emergency repair based on a retractable pier body, characterized in that, It includes: N tubular pier sections, where N is a positive integer greater than or equal to 2. The bottom section is the first pier section, and the top section is the Nth pier section. Each pier section is nested within the next adjacent pier section. The lifting drive mechanism is used to drive the vertical lifting of the pier body above the first pier section to realize the expansion and contraction of the bridge pier during emergency repairs. The bottom of the first pier section is provided with a flange plate for fixing the pier under emergency repair, and the top of the Nth pier section is provided with a flange plate for connecting the pier cap, support or beam. A limiting and guiding mechanism for telescopic movement is provided between two adjacent pier sections, and a positioning and connecting mechanism is provided to fix the upper pier section to the lower pier section after it is raised to a preset position. The limiting and guiding mechanism includes several sets of vertically continuous internal stiffening ribs provided on the inner wall of the first to N-1th pier sections, and several sets of vertically continuous external stiffening ribs provided on the outer wall of the second to Nth pier sections. The external stiffening ribs of the pier section above and the internal stiffening ribs of the pier section below are mutually compatible. Each set of external stiffening ribs consists of two parallel vertical plates, and each set of internal stiffening ribs consists of a vertical rib plate with a cross-section in the shape of an "[". The open end of the "[" shaped vertical rib plate is fixedly connected to the inner wall of the pier body. The internal stiffening rib of the next pier body is inserted into the external stiffening rib of the previous pier body. The positioning connection mechanism between the topmost Nth pier section and the adjacent N-1th pier section is an adjustable positioning connection mechanism, which allows the extension height of the Nth pier section to be adjusted to meet the emergency repair needs of different pier heights. The adjustable positioning connection mechanism consists of several first connection parts set on the top of the N-1th pier section and a second connection part set vertically along the outer wall of the Nth pier section. The first connection parts and the second connection parts are adapted to each other, and several bolt holes are provided at equal intervals on the first connection parts and the second connection parts. The first connection parts and the second connection parts are fixedly connected by bolts. The positioning and connecting mechanism includes a bottom flange plate located on the outer side of the bottom of the upper pier section and a top flange plate located on the inner side of the top of the next pier section. The bottom flange plates and top flange plates of two adjacent pier sections are matched and fixedly connected by bolts. The inner walls of the first and second pier sections are respectively provided with several sets of vertically continuous first and second internal stiffening ribs, which are evenly distributed along the circumference.

2. The emergency repair pier based on a retractable pier body according to claim 1, characterized in that: The lifting drive mechanism includes multiple winches installed on the outer wall of the first pier section, and multiple steel wire ropes fixedly installed at the bottom of the second to Nth pier sections respectively. The second to Nth sections of the pier are raised one by one to a preset position and fixed by pulling the wire rope with the winch, or After the second to N-1 pier sections are simultaneously raised to the preset position and fixed, the winch pulls the Nth pier section to the preset position and fixes it.

3. A repair pier based on a retractable pier body according to claim 2, characterized in that: The steel wire rope at the bottom of the second pier section passes over the fixed pulley at the top of the first pier section and connects to the corresponding winch. The steel wire ropes at the bottom of the third to N-1th pier sections pass over the fixed pulley at the top of the next pier section and are then fixedly connected to the top of the next pier section, where N≥4. When the winch is working, the second to N-1th pier sections rise and fall synchronously. After the second to N-1th pier sections rise synchronously to the preset position and are fixed, the connection between the steel wire rope on the second pier section and the winch is released. The steel wire rope on the Nth pier section passes over the fixed pulley at the top of the N-1th pier section and connects to the winch. The winch pulls the Nth pier section up to the preset position and fixes it.

4. A repair pier based on a retractable pier body according to claim 1, characterized in that: The emergency-repaired bridge piers are filled with structural materials to form a composite structure that serves as a permanent bridge pier.

5. A repair pier based on a retractable pier body according to claim 4, characterized in that: An inflatable core mold is installed within a certain height range inside the bridge pier under repair, and structural materials are filled in to form a hollow bridge pier.

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