A multi-span self-resetting swing double-column pier bridge system with additional small displacement sliding and limiting device

Abstract

The application discloses a multi-span self-resetting swing double-column pier bridge system with additional small-displacement sliding and limiting devices, and belongs to the technical field of swing bridge systems, which comprises a main beam, a pier column and a pile cap arranged in sequence from top to bottom, and prestressed tendons are arranged between the main beam, the pier column and the pile cap; a small-displacement sliding device is arranged between the pier column and the main beam, and the small-displacement sliding device is used for the deformation displacement of the main beam along the bridge direction relative to the pier column when the main beam deforms; a limiting device is further arranged between the pier column and the main beam, and the limiting device is used for limiting the continuous movement of the bridge when the main beam moves to the limit position of the deformation displacement relative to the pier column; the application aims to allow the main beam to relatively slide with the pier under the action of temperature; when the relative sliding between the main beam and the pier along the bridge is large due to the action of an earthquake, the limiting device is triggered, so that the stress mechanism and the seismic performance of the bridge system in the swing process are the same as those of a common multi-span self-resetting swing double-column pier bridge system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rocking bridge system, and particularly relates to a multi-span self-resetting rocking double-column pier bridge system with additional small displacement sliding and limiting device. BACKGROUND

[0002] The severe damage and permanent deformation of reinforced concrete bridge piers under strong earthquakes not only may cause large direct economic losses, but also may cause serious loss of bridge traffic function after the generation of large permanent deformation of the pier as the main vertical load-bearing component, and further may cause interruption of traffic lifeline and other more serious indirect losses. The current bridge seismic design adopts ductility seismic design based on the anti-collapse protection goal, which allows the generation of plastic hinge at the bottom of the pier column (single-column pier) or at the bottom and top (double-column or multi-column pier) under strong earthquakes, and greatly affects the vertical residual carrying capacity and residual seismic capacity of the bridge pier. The ductility design is designed to resist collapse, and the plastic hinge height is difficult to control, and the structure is difficult to quickly restore function and seismic capacity after the earthquake.

[0003] However, returning to the original intention of bridge construction, the non-collapse of the bridge after the strong earthquake is not the ultimate goal, and the quick recovery of the function and the maximum reduction of the structure repair or reconstruction cost are the ultimate goal. The controllable structure damage, undamaged or slightly damaged main structure, quick recovery of function and easy repair of the structure after the earthquake are the development direction of the ductility seismic bridge. The ductility seismic engineering structure is the development frontier of engineering seismic, and the self-resetting rocking bridge is one of the main structural forms of the ductility seismic bridge. At present, the self-resetting rocking structure has been applied to the seismic reinforcement engineering of railway high pier bridge. However, the deformation of the main girder under the action of temperature may cause the decompression problem of the bridge pier bottom in the bridge longitudinal direction, and greatly affects the overall seismic performance of the bridge.

[0004] Therefore, it is necessary to provide a multi-span self-resetting rocking double-column pier bridge system with additional small displacement sliding and limiting device to solve the above problems. SUMMARY

[0005] Therefore, the present application discloses a multi-span self-resetting rocking double-column pier bridge system with additional small displacement sliding and limiting device, which aims to allow the relative sliding of the main girder and the pier under the action of temperature; when the relative sliding of the main girder and the pier in the bridge longitudinal direction is large under the action of earthquake, the limiting device is triggered, so that the stress mechanism and the seismic performance of the bridge system in the rocking process are the same as those of the ordinary multi-span self-resetting rocking double-column pier bridge system.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] The application discloses a multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device, which comprises a main beam, a pier column and a pile cap arranged in sequence from top to bottom, and prestressed tendons are arranged between the main beam, the pier column and the pile cap; a small displacement sliding device is arranged between the pier column and the main beam, and the small displacement sliding device is used for the deformation displacement of the main beam along the bridge direction relative to the pier column when the main beam deforms; a limiting device is further arranged between the pier column and the main beam, and the limiting device is used for limiting the continuous movement of the bridge when the main beam moves to the limit position of the deformation displacement relative to the pier column.

[0008] When the main beam deforms along the bridge direction under the action of temperature, the small displacement sliding device is used for the deformation displacement of the main beam along the bridge direction relative to the pier column, so that the deformation of the main beam caused by the temperature factor is adapted, the pressure relief problem of the bottom of the pier column along the bridge direction caused by the deformation of the main beam relative to the pier column is avoided, and the great influence on the overall seismic performance of the bridge is prevented; when the main beam is displaced to the limit position under the action of the small displacement sliding device, the limiting device is used for limiting the continuous movement of the bridge, so that the displacement of the main beam is prevented from being too large and the overall seismic performance of the bridge is affected.

[0009] Further, the small displacement sliding device comprises a pier cap fixed to the top of the pier column, a groove is formed in the upper side of the pier cap, a plurality of balls are arranged in the groove, the diameter of the ball is greater than the depth of the groove in the upper side of the pier cap, a reserved groove accommodating the pier cap is formed in the bottom of the main beam, and a gap is reserved between the two ends of the reserved groove along the bridge direction and the pier cap.

[0010] When the main beam deforms under the influence of temperature, the rolling cooperation between the ball and the reserved groove is used for reducing the friction between the main beam and the pier cap, so that the displacement of the main beam is more relaxed; meanwhile, the pier cap is arranged to reduce the abrasion of the pier column when the main beam displaces, and the service life of the pier column is prolonged.

[0011] Further, the reserved groove is provided with communicating sliding grooves on the two sides, the sliding grooves are parallel to the bridge direction, and a sliding groove is vertically formed in the top of each sliding groove; the limiting device comprises a wedge-shaped bolt vertically arranged in the sliding groove; the limiting device further comprises a follower rod fixed to the two sides of the pier cap, the follower rod abuts against the bottom of the wedge-shaped bolt, the follower rod is in sliding connection with the corresponding sliding groove, a gap is reserved between the follower rod and the end of the sliding groove, a wedge-shaped through hole larger than the wedge-shaped bolt is arranged on the follower rod, and the wedge-shaped through hole is located between the wedge-shaped bolt and the pier cap.

[0012] When the girder deforms along the bridge direction and horizontally displaces relative to the pier, the pier cap displaces relative to the reserved slot, so that the follower rod slides horizontally in the sliding slot, and when the girder slides to the limit position under the action of the earthquake, the follower rod on one side slides to the wedge-shaped through hole opposite the wedge-shaped bolt, the wedge-shaped bolt is inserted into the through wedge-shaped hole under the action of its own gravity, and the continuous sliding of the girder is limited, so that the displacement of the girder is prevented from being too large, and the seismic performance of the whole bridge is affected.

[0013] Further, the small-displacement sliding device further comprises a reserved steel plate arranged in the reserved slot, the reserved steel plate is a rectangular frame structure with an open bottom, vertical sections of the reserved steel plate are attached to side walls of the reserved slot, and through grooves for the follower rod to pass through are formed on both sides of the reserved steel plate, and the ball is attached to a horizontal section of the reserved steel plate.

[0014] Through the cooperation of the reserved steel plate and the ball, sliding friction between the girder and the pier is converted into rolling friction between the reserved steel plate and the ball, so that the displacement of the girder when the girder deforms due to temperature is facilitated, and wear caused by direct friction between the girder and the pier is avoided, and the service life of the bridge is prolonged.

[0015] Further, extension steel plates extending into the sliding slot are fixed on both sides of the reserved steel plate, the extension steel plates are provided with insertion holes corresponding to the sliding slot, insertion pin housings extending into the sliding slot are fixed at the insertion holes, and the wedge-shaped insertion pin is slidingly connected in the insertion pin housing.

[0016] Through the arrangement of the insertion pin housing, the wedge-shaped insertion pin is located in the insertion pin housing, the wedge-shaped insertion pin is protected, and the wedge-shaped insertion pin is isolated from the girder, so that wear of the girder caused by sliding of the wedge-shaped insertion pin is avoided.

[0017] Further, a bearing platform anchor bar is arranged in the bearing platform, a pier anchor bar is arranged in the pier, and a damping component is connected between the bearing platform anchor bar and the pier anchor bar through a connecting sleeve.

[0018] Further, a bearing platform embedded steel plate is arranged at a contact interface between the bearing platform and the pier, a pad is arranged on the bearing platform embedded steel plate, and the pier anchor bar vertically penetrates the bearing platform embedded steel plate and the pad.

[0019] Further, the upper end of the prestressed tendon is anchored at the top of the girder, the prestressed tendon sequentially penetrates the girder, the embedded steel plate, the pier cap, the pier, the bearing platform embedded steel plate and the pier from top to bottom, and the lower end of the prestressed tendon is anchored at the bottom of the bearing platform.

[0020] Further, a supporting strip is attached below the follower rod, and the supporting strip is anchored at the bottom of the girder.

[0021] Further, outer steel pipes are arranged at both upper and lower ends of the pier.

[0022] Additional advantages, objects, and features of the application will be set forth in part by the description that follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] To make the objects, technical solutions and beneficial effects of the present application clearer, the present application is described below with the help of the accompanying drawings:

[0024] Figure 1 is a front view of an embodiment of the present application;

[0025] Figure 2 is a side view of an embodiment of the present application;

[0026] Figure 3 is an embodiment of the present application Figure 1 is an enlarged schematic view of A in the embodiment of the present application;

[0027] Figure 4 is an enlarged schematic view of C in the embodiment of the present application; Figure 2

[0028] Figure 5 is an enlarged schematic view of B in the embodiment of the present application; Figure 1

[0029] Figure 6 is a horizontal sectional view of the installation of the pier cap in the embodiment of the present application;

[0030] Figure 7 is a structural schematic view of the reserved steel plate in the embodiment of the present application;

[0031] Figure 8 is a structural schematic view of the pier cap in the embodiment of the present application.

[0032] In the drawings, the following signs are marked: main girder 1, bearing platform 2, pier column 3, pier cap 401, follower rod 402, nut 403, supporting strip 404, sliding groove 405, screw rod 406, extended steel plate 407, bolt outer shell 408, wedge-shaped bolt 409, wedge-shaped through hole 410, embedded steel plate 411, ball 412, outer steel tube 413, protection device 414, energy dissipation component 501, pier column anchor 503, connecting sleeve 504, pad plate 505, bearing platform embedded steel plate 506, bearing platform anchor 507, prestressed tendon 6. DETAILED DESCRIPTION

[0033] As Figures 1-8 shown:

[0034] ​​The application discloses a multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device, which comprises a main beam 1, a pier column 3 and a pile cap 2 arranged in sequence from top to bottom, and prestressed tendons 6 are arranged between the main beam 1, the pier column 3 and the pile cap 2; a small displacement sliding device is arranged between the pier column 3 and the main beam 1, and the small displacement sliding device is used for allowing the main beam 1 to deform along the bridge direction relative to the pier column 3 when the main beam 1 deforms; and a limiting device is further arranged between the pier column 3 and the main beam 1, and the limiting device is used for limiting the continuous movement of the bridge when the main beam 1 moves to the limit position of the deformation displacement relative to the pier column 3.

[0035] When the main beam 1 deforms along the bridge direction under the action of temperature, the small displacement sliding device is used for allowing the main beam 1 to deform along the bridge direction relative to the pier column 3, so that the deformation of the main beam 1 caused by the temperature factor is adapted, the deformation of the main beam 1 relative to the pier column 3 is avoided, the problem of pressure relief at the bottom of the pier column 3 is avoided, and the influence on the overall seismic performance of the bridge is avoided; and when the main beam 1 is displaced to the limit position under the action of the small displacement sliding device due to the action of the earthquake, the limiting device is used for limiting the continuous movement of the bridge, so that the displacement of the main beam 1 is prevented from being too large, and the influence on the overall seismic performance of the bridge is avoided.

[0036] In the embodiment, the small displacement sliding device comprises a pier cap 401 fixed to the top of the pier column 3, a groove is formed in the upper side of the pier cap 401, a plurality of rolling balls 412 are arranged in the groove, the diameters of the rolling balls 412 are greater than the depth of the groove in the upper side of the pier cap 401, a reserved slot for accommodating the pier cap 401 is formed in the bottom of the main beam 1, and gaps are reserved between the two ends of the reserved slot along the bridge direction and the pier cap 401.

[0037] When the main beam 1 deforms due to the influence of temperature, the rolling balls 412 and the reserved slot are used for rolling cooperation, the friction between the main beam 1 and the pier cap 401 is reduced, and the displacement of the main beam 1 is more relaxed; meanwhile, the pier cap 401 is arranged to reduce the abrasion of the pier column 3 when the main beam 1 deforms, and the service life of the pier column 3 is prolonged.

[0038] In the embodiment, the two sides of the reserved slot are provided with communicating sliding grooves 405, the sliding grooves 405 are parallel to the bridge direction, and sliding grooves are vertically formed in the top of the sliding grooves 405; the limiting device comprises wedge-shaped bolts 409 vertically arranged in the sliding grooves; the limiting device further comprises follow-up rods 402 fixed to the two sides of the pier cap 401, the follow-up rods 402 abut against the bottom of the wedge-shaped bolts 409, the follow-up rods 402 are slidingly connected with the corresponding sliding grooves 405, gaps are reserved between the follow-up rods 402 and the end portions of the sliding grooves 405, the wedge-shaped through holes 410 with sizes greater than the wedge-shaped bolts 409 are arranged on the follow-up rods 402, and the wedge-shaped through holes 410 are located between the wedge-shaped bolts 409 and the pier cap 401.

[0039] When the main beam 1 deforms in the bridge direction and horizontally displaces relative to the pier 3, the pier cap 401 is relatively displaced relative to the reserved slot, so that the follower rod 402 is relatively horizontally slid in the sliding slot 405, when the main beam 1 slides to the limit position, at this time, the follower rod 402 on one side slides to the wedge-shaped through hole 410 opposite the wedge-shaped latch 409, the wedge-shaped latch 409 is inserted into the through wedge-shaped hole 410 under the action of its own gravity, limiting the main beam 1 from continuously sliding, preventing the main beam 1 from displacing too much and affecting the seismic performance of the whole bridge.

[0040] In the embodiment, the small-displacement sliding device further comprises a reserved steel plate arranged in the reserved slot, the reserved steel plate is a rectangular frame structure with an open bottom, vertical sections of the reserved steel plate are attached to the side walls of the reserved slot, and through grooves for the follower rod 402 to pass through are formed on the two sides of the reserved steel plate, and the ball 412 is attached to the horizontal section of the reserved steel plate.

[0041] Through the cooperation of the reserved steel plate and the ball 412, the sliding friction between the main beam 1 and the pier 3 is converted into the rolling friction between the reserved steel plate and the ball 412, that is, the displacement of the main beam 1 when deforming due to temperature is facilitated, and at the same time, the abrasion caused by the direct friction between the main beam 1 and the pier 3 is avoided, prolonging the service life of the bridge.

[0042] In the embodiment, the two sides of the reserved steel plate are fixed with extension steel plates 407 extending into the sliding slot 405, the extension steel plates 407 are provided with insertion holes corresponding to the sliding slot, the insertion holes are fixed with plug-in housings 408 extending into the sliding slot, and the wedge-shaped latch 409 is slidably connected in the plug-in housing 408.

[0043] Through the arrangement of the plug-in housing 408, the wedge-shaped latch 409 is located in the plug-in housing 408, which plays a protective role for the wedge-shaped latch 409 and also isolates the wedge-shaped latch 409 from the main beam 1, avoiding the abrasion of the main beam 1 caused by the sliding of the wedge-shaped latch 409.

[0044] In the embodiment, the bearing platform 2 is provided with a bearing platform anchor 507, the pier 3 is provided with a pier anchor 503, and the bearing platform anchor 507 and the pier anchor 503 are connected with the energy consumption component 501 through the connecting sleeve 504.

[0045] When an earthquake occurs, the limiting device locks the main beam 1 and the pier 3 when the main beam 1 displaces to the limit position relative to the pier 3, at this time, the pier 3 and the main beam 1 are displaced relative to the bearing platform 2, the pier anchor 503 and the bearing platform anchor 507 are used to stretch the energy consumption component 501, the energy consumption component 501 is used for energy consumption, and the seismic performance of the bridge system is strengthened.

[0046] In this embodiment, the interface between the pier cap 2 and the pier column 3 is provided with a pier cap embedded steel plate 506, and a pad 505 is provided on the embedded steel plate 411. The pier column anchor bar 503 vertically penetrates the pier cap embedded steel plate 506 and the pad 505.

[0047] By setting up the pre-embedded steel plate 506 and pad 505 in the pier cap, the pier column 3 is supported, and wear and tear on the pier column 3 and the pier cap 2 are avoided when the pier column 3 is relatively displaced relative to the pier cap 2 during an earthquake.

[0048] In this embodiment, the upper end of the prestressing tendon 6 is anchored to the top of the main beam 1, and the prestressing tendon 6 passes through the main beam 1, the embedded steel plate 411, the pier cap 401, the pier column 3, the embedded steel plate 506 of the pier cap, and the pier column 3 in sequence. The lower end of the prestressing tendon 6 is anchored to the bottom of the pier cap 2. A protective device 414 for the prestressing tendon 6 to pass through is also provided in the groove.

[0049] By setting prestressed tendons 6, their elasticity and self-resetting effect can reduce the residual deformation of the bridge piers after an earthquake, and improve the energy dissipation capacity and self-resetting capacity of the bridge.

[0050] In this embodiment, a support strip 404 is attached to the lower part of the follower rod 402, and the support strip 404 is anchored to the bottom of the main beam 1 by a screw 406 and a nut 403.

[0051] By setting the support bar 404, the follower rod 402 can be supported and its rotation can be restricted.

[0052] In this embodiment, both the upper and lower ends of the pier column 3 are provided with outer steel pipes 413.

[0053] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device, characterized in that: The structure includes a main beam, piers, and a foundation arranged sequentially from top to bottom, with prestressed tendons between the main beam, piers, and foundation. A small-displacement sliding device is installed between the piers and the main beam to allow for deformation displacement of the main beam relative to the piers along the bridge direction. A limit device is also installed between the piers and the main beam to restrict further movement of the bridge when the main beam moves relative to the piers to its maximum deformation displacement position. The small-displacement sliding device includes a pier cap fixed to the top of the pier, with a groove on the upper side of the pier cap containing several ball bearings, the diameter of which is greater than the depth of the groove. A reserved groove for accommodating the pier cap is provided at the bottom of the main beam, with gaps reserved between the reserved groove and the pier cap at both ends along the bridge direction. Openings are provided on both sides of the reserved groove. The device includes a connected sliding groove parallel to the bridge direction, with vertical grooves at the top of each groove. The limiting device includes a wedge-shaped pin vertically positioned within the groove. It also includes a follower rod fixed to both sides of the pier cap, abutting against the bottom of the wedge-shaped pin. The follower rod is slidably connected to the corresponding sliding groove, with a gap between the follower rod and the end of the sliding groove. Each follower rod has a wedge-shaped through hole larger than the wedge-shaped pin, located between the wedge-shaped pin and the pier cap. The small-displacement sliding device also includes a reserved steel plate within a reserved groove. The reserved steel plate is a rectangular frame structure with an open bottom. The vertical sections of the reserved steel plate are flush with the sidewalls of the reserved groove, and through grooves for the follower rods are provided on both sides of the reserved steel plate. The ball bearings are flush with the horizontal sections of the reserved steel plate.

2. The multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 1, characterized in that: The reserved steel plate has extension steel plates fixed on both sides that extend into the sliding groove. The extension steel plates are provided with insertion holes corresponding to the sliding groove. The insertion holes are fixed with pin housings that extend into the sliding groove. The wedge-shaped pins are slidably connected inside the pin housings.

3. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 2, characterized in that: The pier cap is provided with pier cap anchor bars, and the pier column is provided with pier column anchor bars. The pier cap anchor bars and the pier column anchor bars are connected by a connecting sleeve and an energy-dissipating component.

4. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 3, characterized in that: The interface between the pier cap and the column is provided with a pre-embedded steel plate for the pier cap, and a pad is provided on the pre-embedded steel plate. The anchor bar of the column vertically penetrates the pre-embedded steel plate and the pad.

5. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 4, characterized in that: The upper end of the prestressing tendon is anchored to the top of the main beam, and the prestressing tendon passes through the main beam, the embedded steel plate, the pier cap, the pier column, the embedded steel plate of the pier cap, and the pier column in sequence. The lower end of the prestressing tendon is anchored to the bottom of the pier cap.

6. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 5, characterized in that: A support strip is attached to the bottom of the follower rod, and the support strip is anchored to the bottom of the main beam.

7. A multi-span self-resetting swing double-column pier bridge system with an additional small displacement sliding and limiting device as described in claim 6, characterized in that: Both the upper and lower ends of the pier are equipped with outer steel pipes.

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