Existing pier reinforcing structure provided with full-length self-resetting ribs

Abstract

The existing bridge pier reinforcing structure comprises a bearing platform, a bridge pier and a cover beam which are connected from bottom to top, and further comprises existing longitudinal bars which are arranged in the bearing platform, the bridge pier and the cover beam in a communicated mode, inner grooves are inwards formed in the outer layer parts of the top and the bottom of the bridge pier, the inner grooves are exposed out of the existing longitudinal bars, and the outer layer parts of the top and the bottom of the bridge pier are provided with through self-resetting ribs. The exposed outer layer of the existing longitudinal bar is wrapped with a layer of adhesive tape, and UHPC concrete is poured in the position of the inner groove. UHPC concrete and FRP cloth are used for restraining the pier, the strength of the pier is enhanced, damage to the pier is reduced, and therefore low damage and rapid recovery after an earthquake are achieved. The pier with the reinforced structure basically does not change the appearance of the pier, and the FRP ribs and the FRP cloth which are low in price are adopted, so that the pier is low in cost, convenient to construct and easy to popularize.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge earthquake-resistant reinforcement, and in particular relates to an existing bridge pier reinforcement structure provided with full-length self-resetting ribs. Background Art

[0002] As an important transportation hub, bridge piers will not only cause serious damage and economic losses after being damaged by an earthquake, but also traffic disruption will seriously affect earthquake relief in the disaster area. Therefore, the rapid repair and functional restoration of bridges after an earthquake is very important. At the same time, the reinforced bridge piers can ensure good seismic resistance and recoverability in subsequent aftershocks and even future earthquakes. However, the current seismic reinforcement methods focus more on improving the stiffness and strength of bridge piers, but after another earthquake, the bridge piers will suffer more serious damage and will be difficult to repair after the earthquake, or the bridge piers cannot be repaired due to large residual deformation after the earthquake and have to be demolished and rebuilt. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide an existing bridge pier reinforcement structure provided with full-length self-resetting ribs to ensure that the bridge pier can still be quickly repaired and restored to its function under subsequent earthquake effects.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] The utility model comprises a cap, a pier and a cap beam connected from bottom to top, and also comprises existing longitudinal reinforcements arranged in the cap, the pier and the cap beam in communication, the outer layers of the top and the bottom of the pier are provided with inner grooves inwardly, the inner grooves expose the existing longitudinal reinforcements, the outer layers of the exposed existing longitudinal reinforcements are wrapped with a layer of tape, and UHPC concrete is poured at the inner grooves.

[0006] Furthermore, vertical self-resetting ribs are closely arranged on the outer side of the pier, and two ends of the self-resetting ribs are respectively inserted into the cap beam and the pedestal.

[0007] Furthermore, the outer side of the self-resetting rib is wrapped with a layer of PVC tube.

[0008] Furthermore, it also includes FRP cloth, which is wrapped around the outside of the bridge pier and the PVC pipe.

[0009] The beneficial effects of the utility model are:

[0010] The utility model adopts the reinforcement structure of the present embodiment, and utilizes the self-resetting performance of the self-resetting ribs to reduce the residual deformation of the bridge pier after the earthquake, and utilizes the existing longitudinal reinforcement to provide energy dissipation, so that the bridge pier has a flag-type hysteresis behavior, and has good self-resetting and energy dissipation capabilities. The bridge pier is constrained by UHPC concrete and FRP cloth, the strength of the bridge pier is enhanced, and the damage to the bridge pier is reduced, thereby achieving low damage and rapid recovery after the earthquake. The bridge pier of this reinforcement structure basically does not change the appearance of the bridge pier, and adopts low-priced FRP bars and FRP cloth, which has low cost, convenient construction, and easy promotion; this structure can not only enhance the stiffness and strength of the bridge pier, but also based on the self-resetting swing principle, utilize the good self-resetting performance of the self-resetting ribs to reduce the residual displacement of the bridge pier after the earthquake, and utilize the UHPC concrete and FRP cloth in the plastic hinge area of ​​the pier bottom and pier top to reduce the damage to the bridge pier during the earthquake, and achieve low damage and rapid recovery after the earthquake. The force mechanism of the reinforcement structure proposed by the utility model is clear and easy to design.

[0011] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model provides the following drawings for explanation:

[0013] Figure 1 This is a cross-sectional view of the reinforcement structure of an embodiment of the utility model;

[0014] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0015] Figure 3 This is a cross-sectional view of a bridge pier according to an embodiment of the utility model;

[0016] The markings in the attached figure are as follows: 1. Abutment; 2. Pier; 21. Inner trough; 3. Cap beam; 4. Existing longitudinal reinforcement; 41. Tape; 5. UHPC concrete; 6. Self-centering reinforcement; 7. PVC pipe; 8. FRP cloth. DETAILED DESCRIPTION

[0017] like Figures 1 to 3 As shown, the utility model discloses an existing bridge pier reinforcement structure provided with a through-length self-resetting rib, comprising a cap 1, a pier 2 and a cap beam 3 connected from bottom to top, and also comprising an existing longitudinal rib 4 connected and arranged in the cap 1, the pier 2 and the cap beam 3, as shown in FIG. Figure 1As shown, inner grooves 21 are opened inwardly at the outer layer parts of the top and bottom of the pier 2, and the existing longitudinal reinforcement 4 is exposed by directly stripping the protective layer concrete at the top and bottom of the pier 2. The exposed existing longitudinal reinforcement 4 is wrapped with an outer layer of adhesive tape 41 for non-bonding treatment. Finally, UHPC concrete 5 is poured at the position of the inner groove 21 to enhance the strength of the pier 2. The poured UHPC concrete 5 can cover the concrete part of the pier 2 that was originally stripped. The pier 2 is provided with vertical self-resetting ribs 6 close to the outside, and the two ends of the self-resetting ribs 6 are respectively inserted into the cap beam 3 and the pedestal 1. The self-resetting ribs 6 are installed by drilling holes on the surface of the pedestal 1, the depth of the holes meets the anchoring length of the self-resetting ribs 6, and the drilling position is only close to the outer surface of the pier 2 to ensure that the cross section of the pier 2 is not expanded too much after adding the self-resetting ribs 6. The lower surface of the cap beam 3 is drilled, and the hole of the cap beam 3 and the hole of the pedestal 1 are located on the same vertical line. According to the corresponding vertical lines of the drilling holes of the pedestal 1 and the cap beam 3, grooves are made on the outer surface of the pier 2 for placing the unbonded self-resetting ribs 6, and the purpose is also to reduce the excessive changes in the cross section of the pier 2 caused by adding the external self-resetting ribs 6. The lower end of the full-length self-resetting rib 6 is inserted into the drilled hole of the pedestal 1, and the middle section is wrapped with a PVC pipe 7. The PVC pipe 7 is partially embedded in the groove on the outer surface of the pier 2, and the upper end is inserted into the hole of the cap beam 3. After completion, high-strength grouting material is poured into the holes of the pedestal 1 and the cap beam 3 to anchor the two ends of the self-resetting rib 6. The middle section of the self-resetting rib 6 is wrapped with a PVC tube 7 as a non-bonded section. The self-resetting rib 6 can be a GFRP rib, a CFRP rib or an ultra-high-strength steel bar. Finally, the FRP cloth 8 is wrapped on the pier 2, which can be in the form of strip wrapping or in the form of full-height wrapping of the pier 2. The wrapped FRP cloth 8 is used to constrain the pier 2, improve the strength and rigidity of the pier 2, reduce the damage to the pier 2 itself under the action of an earthquake, and facilitate post-earthquake recovery. The number of layers and height of the FRP cloth 8 wrapping are determined according to the design.

[0018] The reinforcement structure of this embodiment is adopted, and the self-resetting performance of the self-resetting ribs 6 is utilized to reduce the residual deformation of the pier 2 after the earthquake. At the same time, the existing longitudinal bars 4 are used to provide energy dissipation, so that the pier 2 has a flag-type hysteresis behavior and has good self-resetting and energy dissipation capabilities. The UHPC concrete 5 and FRP cloth 8 are used to constrain the pier 2, enhance the strength of the pier 2, and reduce the damage to the pier 2, thereby achieving low damage and rapid recovery after the earthquake. The pier 2 of this reinforced structure basically does not change the appearance of the pier 2, and adopts low-priced FRP bars and FRP cloth 8, which is low in cost, convenient in construction, and easy to promote; this structure can not only enhance the stiffness and strength of the pier 2, but also based on the self-resetting swing principle, utilize the good self-resetting performance of the self-resetting ribs 6 to reduce the residual displacement of the pier 2 after the earthquake, and utilize the UHPC concrete 5 and FRP cloth 8 in the plastic hinge area of ​​the pier bottom and pier top to reduce the damage of the pier 2 during the earthquake, and achieve low damage and rapid recovery after the earthquake. The reinforcement structure proposed by the utility model has a clear force mechanism and is easy to design.

[0019] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An existing bridge pier reinforcement structure provided with a through-length self-resetting rib, comprising a cap (1), a bridge pier (2) and a cap beam (3) connected from bottom to top, and also comprising an existing longitudinal rib (4) arranged in communication with the cap (1), the bridge pier (2) and the cap beam (3), characterized in that: The outer layers of the top and bottom of the pier (2) are provided with inner grooves (21) inwardly, the existing longitudinal reinforcement (4) is exposed in the inner grooves (21), the outer layer of the exposed existing longitudinal reinforcement (4) is wrapped with a layer of tape (41), and UHPC concrete (5) is poured at the position of the inner grooves (21).

2. The existing bridge pier reinforcement structure with full-length self-resetting ribs according to claim 1 is characterized in that: A vertical self-resetting rib (6) is closely arranged on the outer side of the bridge pier (2), and two ends of the self-resetting rib (6) are respectively inserted into the cap beam (3) and the pedestal (1).

3. The existing bridge pier reinforcement structure with full-length self-resetting ribs according to claim 2 is characterized in that: The outer side of the self-resetting rib (6) is wrapped with a layer of PVC tube (7).

4. The existing bridge pier reinforcement structure with full-length self-resetting ribs according to claim 3 is characterized in that: It also includes FRP cloth (8), which is wrapped around the outside of the bridge pier (2) and the PVC pipe (7).

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