Active lifting device for bending bearing performance of concrete bridge

Abstract

The invention discloses an active lifting device for the bending bearing performance of a concrete bridge, and relates to the technical field of bridge engineering, the active lifting device comprises a concrete T-shaped beam, reinforcing steel trusses are fixedly installed at the two ends of the lower surface of the concrete T-shaped beam, and prestressed carbon plates are fixedly installed on the lower surfaces of the reinforcing steel trusses. According to the active lifting device for the bending bearing performance of the concrete bridge, the steel truss for reinforcing is installed at the beam bottom of the concrete T-shaped beam in the length direction, and the prestressed carbon plate is completely attached to the steel truss for reinforcing by means of the flat shape characteristic of the prestressed carbon plate; the midspan area of the concrete T-shaped beam is arched upwards through the upward radial force generated by tensioning the prestressed carbon plate on the reinforcing steel truss bottom plate, the effect of improving the rigidity and bearing capacity of the concrete T-shaped beam is achieved, meanwhile, part of horizontal prestress is converted into upward supporting force through the reinforcing steel truss beam, and the use efficiency of the prestress is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to an active lifting device for the bending bearing performance of a concrete bridge. Background Art

[0002] With the development of China's economy, the increase in traffic volume and the increase in vehicle axle weight, highway transportation has higher and higher requirements for the traffic capacity and bearing capacity of bridges. Many bridges that were built and opened to traffic early can no longer meet the current traffic operation capacity requirements, and many bridges are facing the problem of overload operation. Overload operation often causes structural damage to bridges, which accelerates the aging of bridges and shortens their lifespan, further reducing the traffic operation capacity of bridges. Therefore, it is of great significance to repair these bridges. Prestressed concrete T-beam bridges are a common type of assembled simply supported beam bridge in China because of their advantages such as saving materials, clear force, simple calculation, and convenient construction. After years of operation, many of these bridges have been unable to adapt to the growing traffic requirements and have shown the characteristics of insufficient bearing capacity, and are in urgent need of reinforcement and reconstruction.

[0003] The external prestressing reinforcement method is one of the commonly used reinforcement methods in bridge engineering. The prestressing can be achieved by using traditional prestressed steel strands or lightweight and high-strength carbon fiber plates. Compared with other reinforcement methods, the external prestressing reinforcement method can improve the stiffness and bearing capacity of existing bridges at the same time, and is a very effective reinforcement method. The traditional external prestressing reinforcement method cannot be adjusted twice or multiple times after the prestressing is completed. If the bridge deflects again during use or the first tensioning is not in place due to construction reasons, it will have a great impact on the normal use of the bridge.

[0004] How to develop an active lifting device for the bending bearing performance of concrete bridges, improve the traditional passive external prestressed reinforcement device, develop an adjustable adjustment component at the later stage, and change the passive reinforcement into active lifting, has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an active lifting device for the bending bearing performance of a concrete bridge, so as to solve the problems listed in the background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention discloses an active lifting device for the bending bearing performance of a concrete bridge, comprising a concrete T-beam, wherein both ends of the lower surface of the concrete T-beam are fixedly installed with reinforcing steel trusses, and the lower surface of the reinforcing steel trusses is fixedly installed with prestressed carbon plates.

[0008] Preferably, the reinforcement steel truss comprises a steel truss lower chord steel plate and a steel truss upper chord steel plate, and the steel truss upper chord steel plate is fixedly connected to the concrete T-beam through a steel truss anchor;

[0009] The upper chord steel plate of the steel truss is fixedly connected to the lower chord steel plate of the steel truss through an adjustment component;

[0010] The lower surface of the lower chord steel plate of the steel truss is fixedly connected to the prestressed carbon plate through a prestressed carbon plate anchor.

[0011] Preferably, the adjustment component includes a vertical steel truss web member, which is fixedly connected to the upper surface of the steel truss lower chord steel plate and the lower surface of the steel truss upper chord steel plate respectively through a stiffening plate, and the pipe mouth positions of the vertical steel truss web members on the steel truss lower chord steel plate and the steel truss upper chord steel plate correspond to each other, and a vertical steel truss web member adjustment node is installed between the upper and lower vertical steel truss web members.

[0012] Preferably, it also includes an inclined steel truss web member, and the ends of two inclined steel truss web members are connected to each other through an inclined steel truss web member adjustment node;

[0013] The other end of one of the inclined steel truss web members is hinged to the steel truss lower chord steel plate through the steel truss lower chord node plate, and the side wall of the steel truss lower chord node plate is fixedly connected to the vertical steel truss web member below;

[0014] The other end of the other inclined steel truss web is hinged to the steel truss upper chord steel plate through the steel truss upper chord node plate, and the side wall of the steel truss upper chord node plate is fixedly connected to the vertical steel truss web above.

[0015] Preferably, the vertical steel truss web member adjustment node and the inclined steel truss web member adjustment node are both connected by external threaded pipes.

[0016] Preferably, it also includes a high-durability rubber strip, which is installed between the opposite surfaces of the upper chord steel plate of the steel truss and the concrete T-beam.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The present invention discloses an active lifting device for the bending bearing performance of a concrete bridge. A reinforcing steel truss is installed at the bottom of a concrete T-beam along the length direction, and a prestressed carbon plate that can still ensure good durability in an exposed working environment is installed on the lower surface of the reinforcing steel truss. The flat shape of the prestressed carbon plate is utilized to make it completely fit with the reinforcing steel truss. When the prestressed carbon plate is tensioned, the upward radial force generated by the prestressed carbon plate on the bottom plate of the reinforcing steel truss causes the mid-span area of ​​the concrete T-beam to arch upward, thereby achieving the effect of improving the stiffness and bearing capacity of the concrete T-beam. Not only can the problem of low prestressing efficiency caused by small eccentricity during traditional horizontal tensioning of external prestressing be improved, but also part of the horizontal prestress is converted into upward supporting force by utilizing the reinforcing steel truss, thereby greatly improving the use efficiency of the prestress. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a front view schematic diagram of an active lifting device for the bending bearing performance of a concrete bridge according to the present invention;

[0021] Figure 2 It is a side view schematic diagram of an active lifting device for the bending bearing performance of a concrete bridge according to the present invention;

[0022] Figure 3 It is an enlarged schematic diagram of part A of the present invention;

[0023] Figure 4 It is an enlarged schematic diagram of part B of the present invention;

[0024] Figure 5 It is a schematic diagram of the C-axial cross section of the present invention.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Concrete T-beam; 2. Steel truss for reinforcement; 3. Prestressed carbon plate; 4. Prestressed carbon plate anchor; 5. Steel truss anchor; 6. Vertical steel truss web member; 7. Vertical steel truss web member adjustment node; 8. Steel truss lower chord node plate; 9. Steel truss upper chord node plate; 10. Oblique steel truss web member; 11. Oblique steel truss web member adjustment node; 12. Steel truss lower chord steel plate; 13. Steel truss upper chord steel plate; 14. Stiffening plate; 15. Externally threaded pipe. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] like Figure 1-5As shown, an active lifting device for the bending bearing performance of a concrete bridge comprises a concrete T-beam 1, and reinforcement steel trusses 2 are fixedly installed at both ends of the lower surface of the concrete T-beam 1, and a prestressed carbon plate 3 is fixedly installed on the lower surface of the reinforcement steel truss 2;

[0028] During construction, a reinforcement steel truss 2 is installed at the bottom of the concrete T-beam 1 along the length direction. The reinforcement steel truss 2 has the largest beam height at the middle of the bridge span and the smallest beam height near the two sides. Anchor steel plates are set at the ends of the reinforcement steel truss beams 2. The anchor steel plates are connected to the bottom of the concrete T-beam 1 to be reinforced by embedded anchor bolts.

[0029] At the same time, the prestressed carbon plate can ensure good durability in an exposed working environment, and the flat shape of the prestressed carbon plate can be used to make it fit perfectly with the reinforcement steel truss; the prestressed carbon plate anchor is installed at the end of the reinforcement steel truss 2 using high-strength bolts;

[0030] After the reinforcing steel truss is installed, the prestressed carbon plate is tensioned. The upward radial force generated by the prestressed carbon plate on the bottom plate of the reinforcing steel truss causes the mid-span area of ​​the concrete T-beam 1 to arch upward, thereby achieving the effect of improving the rigidity and bearing capacity of the concrete T-beam.

[0031] Specifically, the reinforcement steel truss 2 includes a steel truss lower chord steel plate 12 and a steel truss upper chord steel plate 13, and the steel truss upper chord steel plate 13 is fixedly connected to the concrete T-beam 1 through a steel truss anchor 5;

[0032] The steel truss upper chord steel plate 13 is fixedly connected to the steel truss lower chord steel plate 12 through an adjustment assembly;

[0033] The lower surface of the steel truss lower chord steel plate 12 is fixedly connected to the prestressed carbon plate 3 through a prestressed carbon plate anchor 4, and also includes a high-durability rubber strip, which is installed between the opposite surfaces of the steel truss upper chord steel plate 13 and the concrete T-beam 1;

[0034] During construction, in order to ensure that the upper flange of the reinforcing steel truss fits tightly with the lower edge of the concrete T-beam to be reinforced, high-durability rubber strips with a thickness of about 5 mm are pasted on both sides above the upper chord steel plate 13 of the steel truss along the length direction. Before installing the reinforcing steel truss 2, epoxy mortar is applied to the inside of the rubber strip. After the reinforcing steel truss 2 is installed in place, it is tightened upward.

[0035] Specifically, the adjustment component includes a vertical steel truss web member 6, and the vertical steel truss web member 6 is fixedly connected to the upper surface of the steel truss lower chord steel plate 12 and the lower surface of the steel truss upper chord steel plate 13 through a stiffening plate 14, and the pipe opening position of the vertical steel truss web member 6 on the steel truss lower chord steel plate 12 and the steel truss upper chord steel plate 13 corresponds to each other, and a vertical steel truss web member adjustment node 7 is installed between the upper and lower vertical steel truss web members 6;

[0036] It also includes an inclined steel truss web member 10, and the ends of two inclined steel truss web members 10 are connected to each other through an inclined steel truss web member adjustment node 11;

[0037] The other end of one of the inclined steel truss web members 10 is hinged to the steel truss lower chord steel plate 12 through the steel truss lower chord node plate 8, and the side wall of the steel truss lower chord node plate 8 is fixedly connected to the vertical steel truss web member 6 below;

[0038] The other end of the other inclined steel truss web member 10 is hinged to the steel truss upper chord steel plate 13 through the steel truss upper chord node plate 9, and the side wall of the steel truss upper chord node plate 9 is fixedly connected to the vertical steel truss web member 6 above;

[0039] The vertical steel truss web member adjustment node 7 and the inclined steel truss web member adjustment node 11 are both connected by an external threaded pipe 15;

[0040] Vertical and oblique steel truss web members are made of round steel pipes, and vertical steel truss web member adjustment nodes 7 and oblique steel truss web member adjustment nodes 11 are respectively set at the midpoints of the vertical steel truss web members and the oblique steel truss web members, and external threaded pipes are installed in the vertical steel truss web member adjustment nodes 7 and the oblique steel truss web member adjustment nodes 11; after the prestressed carbon plate is tensioned and anchored, if the bridge deformation increases and the rigidity is insufficient again during operation, small jacks can be installed on both sides of the vertical steel truss web members of the reinforcement steel truss, and the jacks are placed above the steel plate of the lower chord of the steel truss, and the pistons are lifted up and contact the steel plates of the upper chord of the steel truss beam. The plate is slowly applied with a jacking load, and at the same time, the external threaded tubes at the vertical steel truss web adjustment nodes and the inclined steel truss web adjustment nodes are twisted, so that the relative distances between the vertical steel truss web and the inclined steel truss web between the steel truss lower chord steel plate 12 and the steel truss upper chord steel plate 13 increase with the increase of the jacking load. At this time, the prestressed carbon plate will continue to be tightened. After the jack is lifted to the predetermined position, it is connected and fixed by an external threaded tube, which can not only improve the prestressing level, but also improve the supporting load applied by the prestressed carbon plate to the concrete T-beam through the reinforced steel truss, and actively adjust the bending bearing performance of the concrete bridge.

[0041] Reinforcement construction process:

[0042] 1) Determine the installation position of the reinforcement steel truss and grind the bottom surface of the concrete T-beam at the installation position;

[0043] 2) Drill holes in the concrete beam bottom plate above the anchoring area and install the screws for the anchor bolts;

[0044] 3) Apply epoxy mortar on the top plate of the reinforcement steel truss, install the reinforcement steel truss, and fix the reinforcement steel truss with the steel truss anchors;

[0045] 4) The prestressed carbon plate is tensioned to the design load, and the prestressed carbon plate is fixedly installed on the lower surface of the reinforcement steel truss through the prestressed carbon plate anchor. When the carbon plate is tensioned, the horizontal force can be converted into a vertical force through the reinforcement steel truss;

[0046] 5) When further lifting is required according to force calculation in the later stage, there is no need to re-tension the carbon plate. It is only necessary to install a jack at the position of the vertical steel truss web. The distance between the steel truss lower chord steel plate and the steel truss upper chord steel plate is expanded by the lifting effect of the jack, and the relative distance between the vertical steel truss web and the inclined steel truss web is adjusted by twisting the external threaded pipe, so as to actively improve the bearing capacity of the concrete bridge.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An active device for improving the bending bearing capacity of a concrete bridge, comprising a concrete T-beam (1), characterized in that: Reinforcing steel trusses (2) are fixedly mounted on both ends of the lower surface of the concrete T-beam (1), and prestressed carbon plates (3) are fixedly mounted on the lower surface of the reinforcing steel trusses (2).

2. The active lifting device for the bending bearing performance of a concrete bridge according to claim 1 is characterized by: The reinforcing steel truss (2) comprises a steel truss lower chord steel plate (12) and a steel truss upper chord steel plate (13), and the steel truss upper chord steel plate (13) is fixedly connected to the concrete T-beam (1) via a steel truss anchor (5); The steel truss upper chord steel plate (13) is fixedly connected to the steel truss lower chord steel plate (12) via an adjustment component; The lower surface of the steel truss lower chord steel plate (12) is fixedly connected to the prestressed carbon plate (3) via a prestressed carbon plate anchor (4).

3. The active lifting device for the bending bearing performance of a concrete bridge according to claim 2 is characterized by: The adjustment component includes a vertical steel truss web member (6), and the vertical steel truss web member (6) is fixedly connected to the upper surface of the steel truss lower chord steel plate (12) and the lower surface of the steel truss upper chord steel plate (13) through a stiffening plate (14), and the pipe mouth positions of the vertical steel truss web member (6) on the steel truss lower chord steel plate (12) and the steel truss upper chord steel plate (13) correspond to each other, and a vertical steel truss web member adjustment node (7) is installed between the upper and lower vertical steel truss web members (6).

4. The active lifting device for the bending bearing performance of a concrete bridge according to claim 3 is characterized by: It also includes an inclined steel truss web member (10), the ends of two of the inclined steel truss web members (10) being connected to each other via an inclined steel truss web member adjustment node (11); The other end of one of the inclined steel truss web members (10) is hinged to the steel truss lower chord steel plate (12) through the steel truss lower chord node plate (8), and the side wall of the steel truss lower chord node plate (8) is fixedly connected to the vertical steel truss web member (6) below; The other end of the other inclined steel truss web member (10) is hinged to the steel truss upper chord steel plate (13) through the steel truss upper chord node plate (9), and the side wall of the steel truss upper chord node plate (9) is fixedly connected to the vertical steel truss web member (6) above.

5. The active lifting device for the bending bearing performance of a concrete bridge according to claim 4 is characterized by: The vertical steel truss web member adjustment node (7) and the inclined steel truss web member adjustment node (11) are both connected by an externally threaded pipe (15).

6. The active lifting device for the bending bearing performance of a concrete bridge according to claim 2 is characterized by: It also includes a high-durability rubber strip, which is installed between the opposite surfaces of the upper chord steel plate (13) of the steel truss and the concrete T-beam (1).

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