Active lifting device for flexural bearing performance of concrete bridge

Abstract

The application discloses an active lifting device for flexural bearing performance of a concrete bridge, and relates to the technical field of bridge engineering, comprising a concrete T-shaped beam, two ends of the lower surface of the concrete T-shaped beam are fixedly provided with a reinforcing steel truss, and the lower surface of the reinforcing steel truss is fixedly provided with a prestressed carbon plate. The active lifting device for flexural bearing performance of the concrete bridge is characterized in that the reinforcing steel truss is arranged along the length direction of the beam bottom of the concrete T-shaped beam, the prestressed carbon plate is completely attached to the reinforcing steel truss by virtue of the flat shape of the prestressed carbon plate, the upward radial force generated by the prestressed carbon plate on the bottom plate of the reinforcing steel truss makes the mid-span region of the concrete T-shaped beam arch upward, the rigidity and bearing capacity of the concrete T-shaped beam are improved, and the upward supporting force is generated by converting part of the horizontal prestress into the upward supporting force by the reinforcing steel truss, so that the use efficiency of the prestress is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, and in particular to an active lifting device for flexural bearing performance of a concrete bridge. BACKGROUND

[0002] With the development of China's economy, the increase of traffic volume and the increase of vehicle axle load, the highway transportation has higher and higher requirements for the traffic capacity and bearing capacity of the bridge. Many bridges built in the early stage cannot meet the requirements of the current traffic operation capacity, and many bridges are facing the problem of overloading operation. Overloading operation often causes structural diseases of the bridge, accelerates the aging of the bridge and shortens the service life of the bridge, and further reduces the traffic operation capacity of the bridge. Therefore, it is of great significance to maintain the bridges. The prestressed concrete T-beam bridge is a kind of prefabricated simply supported beam bridge commonly used in China, which has the advantages of saving materials, clear stress, simple calculation and convenient construction. After years of operation, many such bridges have been unable to adapt to the increasing traffic requirements and have shown insufficient bearing capacity, and need to be reinforced and transformed.

[0003] The external prestressing reinforcement method is one of the commonly used reinforcement methods in bridge engineering. The prestress can be realized by traditional prestressed steel strand or light high-strength carbon fiber plate. Compared with other reinforcement methods, the external prestressing reinforcement method can improve the stiffness and bearing capacity of the existing bridge at the same time, and is a very effective reinforcement method. The traditional external prestressing reinforcement method cannot be adjusted again after the prestress is tensioned, and if the bridge appears deflection 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 flexural bearing performance of a concrete bridge can improve the traditional passive external prestressing reinforcement device, develop an adjustable adjusting assembly in the later stage, and change the passive reinforcement to active lifting, which is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide an active lifting device for flexural bearing performance of a concrete bridge to solve the problems listed in the background art.

[0006] To solve the above technical problems, the present application adopts the following technical scheme:

[0007] The active lifting device for flexural bearing performance of a concrete bridge comprises a concrete T-beam, a reinforcing steel truss fixedly installed at both ends of the lower surface of the concrete T-beam, and a prestressed carbon plate fixedly installed at the lower surface of the reinforcing steel truss.

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

[0009] The steel truss upper chord steel plate is fixedly connected with the steel truss lower chord steel plate through an adjusting assembly;

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

[0011] Preferably, the adjusting assembly comprises vertical steel truss web members, the vertical steel truss web members are fixedly connected with the upper surface of the steel truss lower chord steel plate and the lower surface of the steel truss upper chord steel plate through stiffening plates respectively, and vertical steel truss web member adjusting nodes are installed between the vertical steel truss web members corresponding to the pipe opening positions of the vertical steel truss web members on the steel truss lower chord steel plate and the steel truss upper chord steel plate.

[0012] Preferably, the adjusting assembly further comprises diagonal steel truss web members, the end portions of the two diagonal steel truss web members are connected with each other through diagonal steel truss web member adjusting nodes;

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

[0014] The other end of the other diagonal steel truss web member is hingedly connected with the steel truss upper chord steel plate through a steel truss upper chord node plate, and the side wall of the steel truss upper chord node plate is fixedly connected with the vertical steel truss web member above.

[0015] Preferably, the vertical steel truss web member adjusting nodes and the diagonal steel truss web member adjusting nodes are connected through external threaded pipes.

[0016] Preferably, the adjusting assembly further comprises high-durability rubber strips, the high-durability rubber strips are installed between the opposite surfaces of the steel truss upper chord steel plate and the concrete T-shaped beam.

[0017] Compared with the prior art, the present application has the beneficial technical effects that:

[0018] The application is a kind of active lifting device for flexural bearing performance of concrete bridge, which installs a reinforcing steel truss along the length direction of the bottom of the concrete T-shaped beam, and installs a prestressed carbon plate with good durability in exposed working environment on the lower surface of the reinforcing steel truss, uses the flat shape of the prestressed carbon plate to make it completely adhere to the reinforcing steel truss, and makes the mid-span region of the concrete T-shaped beam arch upward by the upward radial force generated by the prestressed carbon plate on the bottom plate of the reinforcing steel truss when the prestressed carbon plate is tensioned, so as to improve the stiffness and bearing capacity of the concrete T-shaped beam, which not only improves the problem of low prestress efficiency caused by small eccentricity during traditional horizontal tensioning of external prestress, but also converts part of the horizontal prestress into upward support force by the reinforcing steel truss, greatly improving the use efficiency of the prestress. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described below in combination with the drawings.

[0020] Figure 1 It is a front view schematic diagram of the active lifting device for flexural bearing performance of concrete bridge.

[0021] Figure 2 It is a side view schematic diagram of the active lifting device for flexural bearing performance of concrete bridge.

[0022] Figure 3 It is an enlarged schematic diagram of part A.

[0023] Figure 4 It is an enlarged schematic diagram of part B.

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

[0025] Explanation of reference signs: 1, concrete T-shaped beam; 2, reinforcing steel truss; 3, prestressed carbon plate; 4, prestressed carbon plate anchor; 5, steel truss anchor; 6, vertically arranged steel truss web member; 7, vertically arranged steel truss web member adjusting node; 8, steel truss lower chord node plate; 9, steel truss upper chord node plate; 10, obliquely arranged steel truss web member; 11, obliquely arranged steel truss web member adjusting node; 12, steel truss lower chord steel plate; 13, steel truss upper chord steel plate; 14, stiffener plate; 15, external threaded pipe. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects of the application more clear and explicit, the application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0027] As Figures 1-5As shown, an active lifting device for flexural bearing performance of a concrete bridge, comprising a concrete T-shaped beam 1, the lower surface of the concrete T-shaped beam 1 is fixedly installed with a reinforcing steel truss 2 at both ends, the lower surface of the reinforcing steel truss 2 is fixedly installed with a prestressed carbon plate 3;

[0028] During construction, the reinforcing steel truss 2 is installed along the length direction at the beam bottom of the concrete T-shaped beam 1, the reinforcing steel truss 2 has the maximum beam height at the bridge midspan and the minimum beam height near the two sides, an anchoring steel plate is arranged at the end of the reinforcing steel truss beam 2, and the anchoring steel plate is connected with the beam bottom of the concrete T-shaped beam 1 to be reinforced through a planted anchor bolt;

[0029] Meanwhile, the prestressed carbon plate can ensure good durability in a bare working environment, and the flat shape of the prestressed carbon plate can be used to completely match the reinforcing steel truss; the prestressed carbon plate anchoring piece is installed at the end of the reinforcing steel truss 2 by 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 at the bottom plate of the reinforcing steel truss makes the midspan area of the concrete T-shaped beam 1 arch upward, so as to improve the rigidity and bearing capacity of the concrete T-shaped beam.

[0031] Specifically, the reinforcing steel truss 2 comprises a steel truss lower chord steel plate 12 and a steel truss upper chord steel plate 13, the steel truss upper chord steel plate 13 is fixedly connected with the concrete T-shaped beam 1 through a steel truss anchoring piece 5;

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

[0033] The lower surface of the steel truss lower chord steel plate 12 is fixedly connected with the prestressed carbon plate 3 through a prestressed carbon plate anchoring piece 4, and further comprises 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-shaped beam 1;

[0034] During construction, in order to ensure that the upper flange of the reinforcing steel truss closely matches the lower edge of the concrete T-shaped beam to be reinforced, a high-durability rubber strip with a thickness of about 5mm is pasted on both sides above the steel truss upper chord steel plate 13 along the length direction, epoxy mortar is applied inside the rubber strip before the reinforcing steel truss 2 is installed, and the reinforcing steel truss 2 is tightly pushed upward after being installed in place.

[0035] Specifically, the adjusting assembly comprises vertical steel truss web members 6, which are fixedly connected with 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 stiffening plates 14 respectively, and vertical steel truss web member adjusting nodes 7 are installed between the upper and lower vertical steel truss web members 6 corresponding to the pipe opening positions of the vertical steel truss web members 6 on the steel truss lower chord steel plate 12 and the steel truss upper chord steel plate 13.

[0036] The adjusting assembly further comprises inclined steel truss web members 10, the ends of the two inclined steel truss web members 10 being connected with each other through inclined steel truss web member adjusting nodes 11.

[0037] One end of one of the inclined steel truss web members 10 is hingedly connected with the steel truss lower chord steel plate 12 through a steel truss lower chord node plate 8, and the side wall of the steel truss lower chord node plate 8 is fixedly connected with the vertical steel truss web member 6 below.

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

[0039] The vertical steel truss web member adjusting nodes 7 and the inclined steel truss web member adjusting nodes 11 are connected with each other through external threaded pipes 15.

[0040] The vertical and inclined steel truss web members are made of round steel pipes, and the vertical steel truss web member adjusting nodes 7 and the inclined steel truss web member adjusting nodes 11 are arranged at the midpoint positions of the vertical and inclined steel truss web members respectively, and the vertical steel truss web member adjusting nodes 7 and the inclined steel truss web member adjusting nodes 11 are internally provided with external threaded pipes. When the prestressed carbon plate is tensioned and anchored, and the problem of bridge deformation and insufficient rigidity occurs again during operation, small jacks can be installed on both sides of the vertical steel truss web member of the reinforcing steel truss, the jacks are placed above the steel truss lower chord steel plate, and the piston contacts the steel truss upper chord steel plate after being lifted, the jacking load is slowly applied, and the external threaded pipes at the vertical steel truss web member adjusting nodes and the inclined steel truss web member adjusting nodes are screwed, so that the relative distance between the vertical steel truss web members and the inclined steel truss web members between the steel truss lower chord steel plate 12 and the steel truss upper chord steel plate 13 increases with the increase of the jacking load of the jacks, at this time, the prestressed carbon plate is continuously tightened, and after the jacks are lifted to the predetermined position, the external threaded pipes are connected and fixed, which can not only increase the prestress level, but also increase the support load of the prestressed carbon plate applied to the concrete T-shaped beam through the reinforcing steel truss, and actively adjust the bending bearing capacity of the concrete bridge.

[0041] Reinforcement construction process:

[0042] 1) Determine the installation position of the reinforcing steel truss, polish 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, install the screw rod of the anchoring bolt;

[0044] 3) Apply epoxy mortar to the top plate of the reinforcing steel truss, install the reinforcing steel truss, and fix the reinforcing steel truss through the steel truss anchor;

[0045] 4) Tension the prestressed carbon plate to the design load, fix the tensioned prestressed carbon plate on the lower surface of the reinforcing steel truss through the prestressed carbon plate anchor, and convert the horizontal force to vertical force when tensioning the carbon plate through the reinforcing steel truss;

[0046] 5) In the later stage, according to the need for stress calculation, the carbon plate does not need to be tensioned again, only the jack needs to be installed at the position of the vertical steel truss web member, the distance between the lower chord steel plate and the upper chord steel plate of the steel truss is expanded through the jacking action of the jack, and the relative distance between the vertical steel truss web member and the inclined steel truss web member is adjusted by turning the external threaded pipe, thereby actively improving the load-bearing performance of the concrete bridge.

[0047] It should be noted that in this paper, relational terms such as first and second are used only 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 the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0048] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. An active lifting device for the flexural bearing capacity of a concrete bridge, comprising a concrete T-beam (1), characterized in that: The lower surface of the concrete T-beam (1) is fixedly installed with a steel truss (2) for reinforcement at both ends, and a prestressed carbon plate (3) is fixedly installed on the lower surface of the steel truss (2). The steel truss (2) for reinforcement includes a lower chord steel plate (12) and an upper chord steel plate (13), wherein the upper chord steel plate (13) is fixedly connected to the lower chord steel plate (12) by an adjustment assembly; The adjustment assembly includes vertical steel truss web members (6), which are fixedly connected to the upper surface of the lower chord steel plate (12) and the lower surface of the upper chord steel plate (13) of the steel truss respectively by stiffening plates (14). The positions of the pipe openings of the vertical steel truss web members (6) on the lower chord steel plate (12) and the upper chord steel plate (13) of the steel truss correspond to each other. A vertical steel truss web member adjustment node (7) is installed between the upper and lower vertical steel truss web members (6). It also includes inclined steel truss web members (10), the ends of two inclined steel truss web members (10) are connected to each other through inclined steel truss web member adjustment nodes (11); the other end of one of the inclined steel truss web members (10) is hinged to the lower chord steel plate (12) of the steel truss through the lower chord node plate (8) of the steel truss, and the side wall of the lower chord node plate (8) of the steel truss is fixedly connected to the lower vertical steel truss web member (6); the other end of the other inclined steel truss web member (10) is hinged to the upper chord steel plate (13) of the steel truss through the upper chord node plate (9) of the steel truss, and the side wall of the upper chord node plate (9) of the steel truss is fixedly connected to the upper vertical steel truss web member (6).

2. The active lifting device for the flexural bearing capacity of a concrete bridge according to claim 1, characterized in that: The upper chord steel plate (13) of the steel truss is fixedly connected to the concrete T-beam (1) by steel truss anchors (5); the lower surface of the lower chord steel plate (12) of the steel truss is fixedly connected to the prestressed carbon plate (3) by prestressed carbon plate anchors (4).

3. The active lifting device for the flexural bearing capacity of a concrete bridge according to claim 2, characterized in that: Both the vertical steel truss web member adjustment node (7) and the inclined steel truss web member adjustment node (11) are connected by external threaded pipes (15).

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

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