Toughness anti-seismic reinforcing device and method for in-service reinforced concrete pier

Abstract

The invention provides a toughness anti-seismic strengthening device and method for an in-service reinforced concrete pier, belongs to the field of toughness anti-seismic strengthening of bridges, and aims to solve the problem of insufficient anti-seismic capacity of existing dangerous and old bridges. After concrete in a plastic hinge area is removed, an elastic rubber pad is laid on the top face of a bearing platform, then concrete is poured, separation of a pier column and the bearing platform is achieved, then the reconstructed plastic hinge area and the bearing platform are connected in series through prestressed tendons and pressed tightly, and a structural system with the self-resetting capacity is formed. When an earthquake occurs, the longitudinal bars in the in-service reinforced concrete pier can be used as energy dissipation parts to dissipate earthquake energy; and the prestressed tendons can provide strong restoring force for the whole reinforcing system by virtue of the high elasticity, so that the residual displacement of the pier can be effectively reduced, and even the pier is basically rebounded to the original position after an earthquake. If the stress of the prestressed tendons is lost or yielded after an earthquake, the functions of the bridge can be quickly recovered only by opening the sealing plates and performing supplementary tensioning or replacement on the prestressed tendons, and the anti-seismic toughness is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bridge resilience aseismic reinforcement, and particularly relates to a resilience aseismic reinforcement device and method for in-service reinforced concrete bridge piers. BACKGROUND

[0002] As a lifeline project, bridges should have the ability to resist major natural disasters, ensure smooth traffic during disasters, and achieve rapid recovery of post-disaster functions. However, many early bridges lack adequate seismic design or even lack it, and some bridges have shown significant material degradation due to long-term use and harsh environmental impact. At the same time, the new edition of the "China Seismic Parameter Zoning Map" has increased the proportion of regions with peak ground acceleration of 0.10g (Ⅶ degree) and above from 49% to 58%, further increasing the requirements for seismic performance. Under this background, due to design defects, structural aging and the improvement of standards, the seismic capacity of a large number of existing dangerous and old bridges has been significantly insufficient, and it is urgent to carry out aseismic reinforcement and performance improvement.

[0003] Currently, the aseismic reinforcement technology for in-service reinforced concrete bridge piers still mainly focuses on ductility enhancement. Although this method can improve the seismic capacity to a certain extent, the bridge pier often still produces significant damage or large residual displacement during an earthquake, and lacks a quick and effective repair method after the earthquake, making it difficult to recover to a usable state. This problem seriously restricts the smoothness and recovery efficiency of emergency traffic lifelines after an earthquake, and has become a key bottleneck for improving the aseismic resilience of existing bridge piers. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a resilience aseismic reinforcement device and method for in-service reinforced concrete bridge piers, which solves the problem of insufficient aseismic capacity of existing dangerous and old bridges in the prior art.

[0005] To achieve the above object and other related objects, the present application provides a kind of toughness seismic strengthening device of reinforced concrete pier in service, and the pier has plastic hinge zone and is located on pile cap, and the toughness seismic strengthening device includes: reconstructed plastic hinge section, isolation pad and multiple groups of prestressed components;Reconstructed plastic hinge section is the structure formed by re-pouring after the original concrete of plastic hinge zone is chiseled, for reconstructing plastic hinge zone;Isolation pad is arranged between reconstructed plastic hinge section and pile cap, and multiple first through holes and multiple second through holes are arranged on isolation pad;First through hole is used for the longitudinal reinforcement of plastic hinge zone to pass through;Multiple groups of prestressed components are arranged along the circumference of pier, and each group of prestressed components includes: straight line pipe, arc pipe, at least one prestressed tendon and multiple anchorage devices;Straight line pipe is arranged in reconstructed plastic hinge section, and its axial direction is parallel to the axis of pier;Arc pipe is arranged in pile cap, and its two ends respectively lead to the upper surface and side surface of pile cap;After passing through straight line pipe, one second through hole on isolation pad and arc pipe, prestressed tendon is connected with anchorage device at two ends respectively.

[0006] Optionally, reconstructed plastic hinge section includes reinforcing stirrups and post-poured concrete;Multiple reinforcing stirrups are respectively bound on the longitudinal reinforcement of plastic hinge zone;Straight line pipe is fixed on reinforcing stirrups;Post-poured concrete is used to wrap reinforcing stirrups, straight line pipe and longitudinal reinforcement of plastic hinge zone.

[0007] Optionally, the cross-sectional area of reconstructed plastic hinge section is greater than the cross-sectional area of plastic hinge zone.

[0008] Optionally, the cross-sectional area of reconstructed plastic hinge section is 1.2 times the cross-sectional area of plastic hinge zone.

[0009] Optionally, the prestressed component further includes multiple spiral tendons and an arc-shaped hole provided on the pile cap;The end outside of each straight line pipe and each arc pipe is provided with a spiral tendon;Arc pipe is arranged in arc-shaped hole, and the outer side wall of arc pipe and the inner side wall of arc-shaped hole are filled with mortar.

[0010] Optionally, it further includes multiple groups of sealing components, and the pile cap and the reconstructed plastic hinge section are provided with grooves for accommodating the anchorage devices;Each groove is correspondingly provided with a group of sealing components, and the sealing components are used to seal the opening of the groove.

[0011] Optionally, the sealing component includes a sealing plate and two hinges;One end of the two hinges is respectively connected with the pile cap, and the other end is detachably connected with the sealing plate, and the sealing plate is used to seal the opening of the groove.

[0012] Optionally, the sealing plate is connected with the hinge through a first bolt;The hinge is connected with the pile cap through a second bolt, and a plant glue is arranged between the second bolt and the pile cap.

[0013] Optionally, the length of the second bolt implanted in the pile cap is greater than twice the diameter of the second bolt.

[0014] In another aspect, the application provides a method for reinforcing a reinforced concrete pier in service, comprising a device for reinforcing a reinforced concrete pier in service as described above, and further comprising the following steps: A step of removing: drilling an arc-shaped hole on the pile cap and removing all the concrete in the plastic hinge zone; A step of pouring: placing the isolation pad on the pile cap, then binding the reinforcing hoop on the longitudinal reinforcement in the plastic hinge zone, fixing the linear pipe on the reinforcing hoop, and placing the arc-shaped pipe in the arc-shaped hole, and then pouring the post-cast concrete; A step of prestressed tendon tensioning: passing the prestressed tendon through the linear pipe, a second through hole on the isolation pad, and the arc-shaped pipe, and fixing it with the anchor.

[0015] As described above, the device and method for reinforcing a reinforced concrete pier in service have at least the following beneficial effects: By removing the concrete in the plastic hinge zone, laying the elastic rubber pad on the top surface of the pile cap, and then pouring the concrete, the pier column and the pile cap are separated, and then the reconstructed plastic hinge section and the pile cap are connected and compressed by the prestressed tendon, forming a structure system with self-resetting capability. When an earthquake occurs, the longitudinal reinforcement in the reinforced concrete pier is the energy dissipation component that dissipates seismic energy; and the prestressed tendon can provide strong restoring force to the entire reinforcement system due to its high elasticity, effectively reducing the residual displacement of the pier, and even making it bounce back to its original position after the earthquake. After the earthquake, if the prestressed tendon yields or is damaged, the bridge function can be quickly restored by opening the sealing plate and supplementing or replacing the prestressed tendon, greatly improving the seismic toughness. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A cross-sectional structure schematic diagram of the device for reinforcing a reinforced concrete pier in service is shown.

[0017] Figure 2 A top view structure schematic diagram of the device for reinforcing a reinforced concrete pier in service is shown.

[0018] Figure 3 A simplified structure schematic diagram of the isolation pad is shown.

[0019] Figure 4 An enlarged schematic diagram of A in the device for reinforcing a reinforced concrete pier in service is shown. Figure 1

[0020] Element number explanation: ​1, bearing platform, 2, longitudinal reinforcement, 3, reconstructed plastic hinge section, 31, reinforcing hoop, 32, post-cast concrete, 4, isolation pad, 41, first through hole, 42, second through hole, 5, prestressed assembly, 51, straight pipe, 52, arc pipe, 53, prestressed reinforcement, 54, anchor, 55, spiral reinforcement, 56, arc hole, 6, sealing assembly, 61, sealing plate, 62, hinge, 63, first bolt, 64, second bolt, 7, groove. DETAILED DESCRIPTION

[0021] The present application will be described by way of specific embodiments, and those skilled in the art will readily understand other advantages and purposes of the present application from the disclosure of the present application.

[0022] Please refer to the following drawings. It should be understood that the structure, proportion, size, etc. shown in the drawings of the present application are only used to illustrate the content disclosed in the present application, to facilitate those skilled in the art to understand and read, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present application are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0023] The following embodiments are only for illustration. The various embodiments can be combined, which are not limited to the content shown in the following single embodiment.

[0024] Please refer to Figures 1-4 The present application provides a ductile seismic reinforcement device for in-service reinforced concrete pier, the in-service reinforced concrete pier has a plastic hinge zone and is located on a bearing platform 1, and the longitudinal reinforcement 2 of the in-service reinforced concrete pier extends from the pier to the bearing platform 1.

[0025] The resilient seismic strengthening device includes: a reconstructed plastic hinge section 3, an isolation pad 4, and multiple sets of prestressed components 5. The reconstructed plastic hinge section 3 is a structure formed by removing the original concrete of the plastic hinge section and recasting it, used for reconstructing the plastic hinge section. The isolation pad 4 is placed between the reconstructed plastic hinge section 3 and the foundation 1, and the isolation pad 4 is provided with multiple first through holes 41 and multiple second through holes 42; the first through holes 41 are used for the longitudinal reinforcement 2 of the plastic hinge section to pass through. Multiple sets of prestressed components 5 are arranged circumferentially along the pier. Each set of prestressed components 5 includes: a straight duct 51, an arc-shaped duct 52, at least one prestressing tendon 53, and multiple anchors 54. The straight duct 51 is set in the reconstructed plastic hinge section 3, and its axis is parallel to the pier axis. The arc-shaped duct 52 is set in the pier cap 1, and its two ends are respectively connected to the upper surface and side surface of the pier cap 1. The prestressing tendon 53 passes through the straight duct 51, a second through hole 42 on the isolation pad 4, and the arc-shaped duct 52 before being connected to the anchor 54.

[0026] The reconstructed plastic hinge section 3 may include reinforcing stirrups 31 and post-cast concrete 32, which may be high-strength concrete. The reinforcing stirrups 31 can be tied to the longitudinal reinforcement 2 of the plastic hinge section using wire or other structures to form a reinforcing skeleton. Then, the post-cast concrete 32 is poured to reconstruct the plastic hinge section.

[0027] The isolation pad 4 can be made of rubber. In order to allow the longitudinal rib 2 to pass through the first through hole 41 of the isolation pad 4, the isolation pad 4 can be divided into sections as follows: Figure 3 The multiple isolation pads shown. Figure 3 Each of the four isolation pads has a number of semi-circular notches. After two isolation pads are merged, the two semi-circular notches are enclosed to form a first through hole 41 for the longitudinal reinforcement 2 to pass through. Figure 3 Two through holes are provided on the left and right isolation pads, respectively, corresponding to the second through hole 42, so that the prestressing tendon 53 can pass through.

[0028] The straight pipe 51 and the curved pipe 52 can be PVC pipes or corrugated pipes; this embodiment does not impose any restrictions on them.

[0029] The prestressed component 5 may also include multiple spiral reinforcements 55 and arc-shaped holes 56 disposed on the foundation 1. Spiral reinforcements 55 are provided on the outer side of the end of each straight pipe 51 and each arc-shaped pipe 52. Alternatively, spiral reinforcements 55 can be provided on the outer walls of both the straight pipe 51 and the arc-shaped pipe 52 to enhance the compressive strength and splitting resistance of the locally poured concrete 32. The straight pipe 51 can be tied to the reinforcing stirrups 31 using wire or similar structures. The arc-shaped pipe 52 is disposed within the arc-shaped holes 56. To fix the arc-shaped pipe 52, the space between the outer wall of the arc-shaped pipe 52 and the inner wall of the arc-shaped hole 56 is filled with high-strength mortar.

[0030] The ductility anti-seismic reinforcing device of the embodiment further comprises a plurality of sealing assemblies 6, and the bearing platform 1 and the reconstructed plastic hinge section 3 are provided with grooves 7 for accommodating anchorage devices 54, and each groove 7 is provided with a sealing assembly 6, and the sealing assembly 6 is used for sealing the groove 7 to avoid corrosion of the prestressed tendon by rainwater or air carbonization and the like.

[0031] The sealing assembly 6 can comprise a sealing plate 61 and two hinges 62, one end of the two hinges 62 is connected with the bearing platform 1 or the reconstructed plastic hinge section 3, and the other end is detachably connected with the sealing plate 61, and the sealing plate 61 is used for sealing the opening of the groove 7. Specifically, the sealing plate 61 can be connected with the hinge 62 through a first bolt 63, so as to facilitate subsequent maintenance of the prestressed tendon 53. The connection end of the hinge 62 with the bearing platform 1 or the reconstructed plastic hinge section 3 can be connected through a second bolt 64, and the second bolt 64 can be a pointed bolt, and the connection position of the second bolt 64 with the bearing platform 1 is provided with a bonded rebar glue. The length of the second bolt 64 embedded in the bearing platform 1 is greater than twice the diameter of the second bolt 64, so as to ensure the stability of the connection.

[0032] On the other hand, the application further provides a ductility anti-seismic reinforcing method for a reinforced concrete bridge pier in service, which comprises a ductility anti-seismic reinforcing device for a reinforced concrete bridge pier in service as described above, and further comprises the following steps: The step of removing: drilling arc-shaped holes 56 on the bearing platform 1 and removing all the concrete of the plastic hinge section.

[0033] In this step, the concrete of the plastic hinge section can be chiseled by corresponding mechanical equipment first, and the bridge pier is supported by using a scaffold or a jack and the like before or during chiseling, so as to avoid collapse of the bridge. Then, the arc-shaped holes 56 are drilled on the bearing platform 1.

[0034] The pouring step: first, the isolation pad 4 is placed on the bearing platform 1, then the reinforcing stirrup 31 is bound on the longitudinal reinforcement 2 of the plastic hinge section, the linear pipeline 51 is fixed on the reinforcing stirrup 31, the arc-shaped pipeline 52 is placed in the arc-shaped hole 56, and then the pouring of the post-cast concrete 32 is completed.

[0035] In this step, the isolation pad 4 is placed on the bearing platform 1, and the longitudinal reinforcement 2 of the plastic hinge zone is passed through the first through hole 41. Then a plurality of reinforcing stirrups 31 are arranged at intervals in the height direction of the plastic hinge zone, and are firmly bound to the longitudinal reinforcement 2 by structures such as iron wire, forming a reinforcing framework. Then the spiral reinforcement 55 is arranged outside the straight pipe 51 and the arc pipe 52, and the straight pipe 51 is bound to the reinforcing stirrup 31 by iron wire, and when bound, the axis of the straight pipe 51 is parallel to the axis of the pier. In this process, the arc pipe 52 can be simultaneously placed into the arc hole 56. Subsequently, the gap between the arc pipe 52 and the arc hole 56 is filled with high-strength mortar, so as to be fixed.

[0036] Then the formwork is supported outside the plastic hinge zone. The internal size of the formwork needs to ensure that the cross-sectional area of the reconstructed plastic hinge section 3 (i.e. the post-cast concrete 32 layer) finally formed reaches 1.2 times the cross-sectional area of the original plastic hinge zone, so as to achieve the purpose of increasing the section, so as to facilitate the subsequent anchoring of the prestressed tendon 53.

[0037] Finally, the high-strength post-cast concrete 32 is poured and vibrated, so as to wrap the original longitudinal reinforcement 2, the reinforcing stirrup 31 and the straight pipe 51, forming an outer reinforcing layer with good integrity. And after curing to the design strength, the formwork is removed.

[0038] The prestressed tendon 53 tensioning step: the prestressed tendon 53 is passed through the straight pipe 51, a second through hole 42 on the isolation pad 4, and the arc pipe 52, and is fixed by using the anchor 54.

[0039] In this step, the prestressed tendon 53 (such as steel strand) is sequentially passed into the straight pipe 51, the second through hole 42 on the isolation pad 4, and the arc pipe 52 in the bearing platform 1 from above, so that the two ends thereof are exposed from the top surface of the reinforcing layer and the side surface of the bearing platform 1 respectively. The anchor 54 (such as a working anchor plate, a clamping piece) is installed at the two ends of the prestressed tendon 53. The recess 7 is pre-formed on the side surface of the bearing platform 1 and the top surface of the reinforcing layer, so that the anchor 54 can be embedded therein, keeping the outer surface of the reconstructed plastic hinge section 3 and the bearing platform 1 flat. The prestressed tendon 53 is synchronously and symmetrically tensioned by using a tensioning device, so as to reach the design prestress value, which can be 40%-60% of the yield stress of the prestressed tendon 53, so as to avoid the yield of the prestressed tendon 53 under the action of the earthquake load. After tensioning, anchoring is performed.

[0040] After anchoring, the sealing assembly 6 is installed to protect the anchor 54 and keep the appearance beautiful. Specifically, the second bolt 64 is planted into the bearing platform 1 (the planting depth is greater than twice the diameter of the second bolt 64) by using a planting glue, for fixing one end of the hinge 62. The sealing plate 61 is detachably installed on the other end of the hinge 62 by the first bolt 63. In this way, the opening of the recess 7 containing the anchor 54 can be completely sealed.

[0041] Working principle and beneficial effects: By removing the plastic hinge zone concrete, laying an elastic rubber pad on the top surface of the pile cap 1, and then pouring concrete, the separation of the pier column and the pile cap 1 is realized, and then the reconstructed plastic hinge section 3 and the pile cap 1 are connected and compressed by the prestressed tendon 53, forming a structure system with self-resetting capability. When an earthquake occurs, the longitudinal reinforcement 2 in the in-service reinforced concrete pier is the energy dissipation component that dissipates seismic energy; and the prestressed tendon 53 is always in an elastic state, like a rubber band, providing strong restoring force for the entire reinforcement system, which can effectively reduce the residual displacement of the pier, and even make it basically rebound to the original position after the earthquake. After the earthquake, if the prestressed tendon 53 is damaged, only the sealing plate 61 needs to be opened, and the prestressed tendon 53 needs to be tensioned or replaced, so that the bridge function can be quickly restored, and the seismic toughness is greatly improved.

[0042] In summary, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0043] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A tough seismic reinforcement device for in-service reinforced concrete bridge piers, wherein the bridge pier has a plastic hinge zone and is situated on a pier cap (1), characterized in that, The resilient seismic reinforcement device includes: a reconstructed plastic hinge section (3), an isolation pad (4), and multiple sets of prestressed components (5); The reconstructed plastic hinge section (3) is a structure formed by removing the original concrete of the plastic hinge section and re-casting it, which is used to reconstruct the plastic hinge section. The isolation pad (4) is disposed between the reconstructed plastic hinge section (3) and the bearing platform (1). The isolation pad (4) is provided with a plurality of first through holes (41) and a plurality of second through holes (42). The first through holes (41) are used for the longitudinal reinforcement (2) of the plastic hinge section to pass through. Multiple sets of the prestressed components (5) are arranged around the pier. Each set of prestressed components (5) includes: a straight duct (51), an arc duct (52), at least one prestressed tendon (53), and multiple anchors (54). The straight pipe (51) is located within the reconstructed plastic hinge section (3), and its axis is parallel to the pier axis. The arc-shaped pipe (52) is installed inside the pier (1), with its two ends leading to the upper surface and side surface of the pier (1) respectively; The prestressed tendon (53) passes through the straight pipe (51), a second through hole (42) on the isolation pad (4), and the arc-shaped pipe (52), and its two ends are connected to the anchor (54) respectively.

2. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 1, characterized in that: The reconstructed plastic hinge section (3) includes reinforcing stirrups (31) and post-cast concrete (32). Multiple reinforcing stirrups (31) are respectively tied to the longitudinal reinforcement (2) in the plastic hinge zone; the straight pipe (51) is fixed to the reinforcing stirrups (31); The post-cast concrete (32) is used to wrap the reinforcing stirrups (31), the straight pipe (51), and the longitudinal reinforcement (2) of the plastic hinge zone.

3. The toughness-based seismic strengthening device for in-service reinforced concrete bridge piers according to claim 2, characterized in that: The cross-sectional area of ​​the reconstructed plastic hinge segment (3) is greater than the cross-sectional area of ​​the plastic hinge region.

4. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 3, characterized in that: The cross-sectional area of ​​the reconstructed plastic hinge segment (3) is 1.2 times the cross-sectional area of ​​the plastic hinge region.

5. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 1, characterized in that: The prestressed component (5) also includes multiple spiral bars (55) and arc-shaped holes (56) provided on the foundation (1). Each of the straight pipes (51) and each of the arc pipes (52) has a spiral rib (55) on the outer side of its end; the arc pipe (52) is disposed in the arc hole (56), and the outer side wall of the arc pipe (52) and the inner side wall of the arc hole (56) are filled with mortar.

6. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 1, characterized in that: It also includes multiple sets of sealing components (6), and the bearing platform (1) and the reconstructed plastic hinge section (3) are provided with grooves (7) for accommodating the anchor (54); each groove (7) is provided with a set of sealing components (6), and the sealing components (6) are used to seal the groove (7).

7. The toughness-based seismic strengthening device for in-service reinforced concrete bridge piers according to claim 6, characterized in that: The sealing assembly (6) includes a sealing plate (61) and two hinges (62); One end of each of the two hinges (62) is connected to the base (1), and the other end is detachably connected to the sealing plate (61), which is used to seal the opening of the groove (7).

8. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 7, characterized in that: The sealing plate (61) is connected to the hinge (62) by a first bolt (63); The hinge (62) is connected to the base (1) by the second bolt (64), and a rebar adhesive is provided between the second bolt (64) and the base (1).

9. The toughness-resistant seismic strengthening device for in-service reinforced concrete bridge piers according to claim 8, characterized in that: The length of the second bolt (64) implanted into the bearing (1) is greater than twice the diameter of the second bolt (64).

10. A method for toughening and seismic strengthening of in-service reinforced concrete bridge piers, characterized in that, The device for toughening and seismic strengthening of in-service reinforced concrete bridge piers as described in any one of claims 1-9 further includes the following steps: Demolition steps: Drill an arc-shaped hole (56) on the foundation (1) and remove all concrete from the plastic hinge zone; Pouring steps: First, place the isolation pad (4) on the foundation (1), then tie the reinforcing stirrup (31) on the longitudinal reinforcement (2) of the plastic hinge zone, fix the straight pipe (51) on the reinforcing stirrup (31), and place the arc pipe (52) into the arc hole (56), and then pour the final concrete (32). Prestressing tendon tensioning steps: Pass the prestressing tendon (53) through the straight pipe (51), a second through hole (42) on the isolation pad (4), and the arc pipe (52), and fix it with the anchor (54).

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