Concrete bridge reinforcing structure
By setting beam end anchor blocks, span anchor blocks, and turning anchor blocks on the bridge body, the arrangement of prestressed tendons was optimized, solving the problem of low efficiency in prestressed shear strengthening of simply supported T-beams, and achieving a more efficient shear strengthening effect and improved stability of the bridge structure.
Patent Information
- Application Number
- CN202520273722.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-20
AI Technical Summary
The prestressed shear strengthening efficiency of simply supported T-beams is relatively low, and the arrangement of anchor points is limited, affecting the effective range of strengthening and shear capacity.
Beam end anchor blocks are fixed at the beam ends of the bridge body, and span anchor blocks are fixed in the middle. The prestressed tendons are connected by turning anchor blocks. The prestressed tendons are bent. The horizontal height of the span anchor blocks is lower than that of the beam end anchor blocks, which increases the bend angle and vertical reaction force and optimizes the prestressing arrangement.
It improves the shear strengthening efficiency of simply supported T-beams, increases the strengthening area and shear capacity, avoids the design difficulties of prestressed tendon tensioning, and enhances the overall stability and load-bearing capacity of the bridge.
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Figure CN223706311U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of bridge reinforcement, and in particular to a concrete bridge reinforcement structure. BACKGROUND
[0002] The external prestressing method is a reliable method for reinforcing concrete structures. By actively applying external prestress to the structure, the stress distribution of the structure under dead load is improved, and the crack resistance and load-carrying capacity of the structure are improved.
[0003] In related technologies, in the reinforcement scene of simply supported T-shaped beams, the prestressing tendons are generally bent upwards near the beam ends. For simply supported beams that use tensioning prestressing at the beam ends, in order to meet the spatial needs of factors such as the arrangement of post-anchoring tensioning jack devices, the anchoring points can only be arranged near the middle of the web plate at the beam end, and sufficient working space needs to be left between the anchoring points and the beam end diaphragm, so that the external prestress shear reinforcement efficiency of the simply supported T-shaped beam is often not high, and the effective range of reinforcement is limited. SUMMARY
[0004] The present application provides a concrete bridge reinforcement structure to solve the technical problem of low prestress shear reinforcement efficiency of a simply supported T-shaped beam in related technologies.
[0005] The present application provides a concrete bridge reinforcement structure, comprising:
[0006] a bridge body;
[0007] a beam end anchoring block fixed to the beam end portion of the bridge body in the length direction;
[0008] a span anchoring block fixed to the middle portion of the bridge body in the length direction, the horizontal height of the span anchoring block being lower than the horizontal height of the beam end anchoring block;
[0009] a turning anchoring block fixed to one side of the span anchoring block facing the beam end anchoring block;
[0010] a zigzag prestressing tendon having one end fixed in the span anchoring block and the other end fixed in the beam end anchoring block after passing through the turning anchoring block, the zigzag prestressing tendon being turned and bent by the turning anchoring block.
[0011] In some possible implementations, along the length direction of the bridge body, the beam end portions on both sides of the bridge body are respectively fixed with one beam end anchoring block, and the middle portion of the bridge body is fixed with two span anchoring blocks at intervals;
[0012] One zigzag prestressing tendon is arranged between each span anchoring block and the beam end anchoring block on the same side.
[0013] In some possible implementations, the present application further comprises:
[0014] The straight prestressed beam is fixedly connected with two of the span-anchoring blocks at two ends respectively.
[0015] The straight prestressed beam is configured to serve as a bending-resistant reinforcing beam in a first anchoring state lower than the folded prestressed beam and serve as a shear-resistant reinforcing beam in a second anchoring state higher than the folded prestressed beam.
[0016] In some possible implementation manners, the straight prestressed beam has at least two groups of prestressed beams arranged at intervals along the width direction of the bridge body.
[0017] In some possible implementation manners, the folded prestressed beam has at least two groups of prestressed beams arranged at intervals along the width direction of the bridge body, and the folded prestressed beam and the straight prestressed beam are both located on the web side of the bridge body.
[0018] In some possible implementation manners, the straight prestressed beam does not overlap the folded prestressed beam in the projection on the ground.
[0019] In some possible implementation manners, the two beam-end anchoring blocks are located at the same horizontal height, and the two span-anchoring blocks are located at the same horizontal height.
[0020] In some possible implementation manners, the turning anchoring block is fixed at the quarter-point position of the bridge span of the bridge body, and the two turning anchoring blocks and the two span-anchoring blocks are symmetrically arranged.
[0021] In some possible implementation manners, at least one of the beam-end anchoring block, the span-anchoring block and the turning anchoring block is a steel structural block, or at least one of the beam-end anchoring block, the span-anchoring block and the turning anchoring block is a concrete pouring block.
[0022] In some possible implementation manners, the turning anchoring block is internally provided with a turning device, which is used for penetrating the folded prestressed beam and guiding the folded prestressed beam to be bent to the beam-end anchoring block.
[0023] The concrete bridge reinforcing structure provided in the application comprises a beam end anchoring block fixed at the beam end of the bridge body, a span anchoring block fixed at the middle part of the bridge body, a turning anchoring block fixed at the side of the span anchoring block facing the beam end anchoring block, and a zigzag prestressed beam having one end fixed in the span anchoring block and the other end fixed in the beam end anchoring block after passing through the turning anchoring block. The zigzag prestressed beam is turned and bent by the turning anchoring block. Thus, the zigzag prestressed beam makes the beam end anchoring block not need to consider the post-anchoring tension space, but directly tensioned through the side of the span anchoring block, which reduces the tension design difficulty of the prestressed beam. Meanwhile, since the horizontal height of the span anchoring block is lower than that of the beam end anchoring block, the beam end anchoring point can be arranged on the upper part of the web in the beam end direction, so as to increase the bending angle of the zigzag prestressed beam, provide greater vertical reaction force, and further improve the shear reinforcing efficiency of the beam body. BRIEF DESCRIPTION OF DRAWINGS
[0024] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
[0025] Figure 1 FIG. 1 is a structural schematic diagram of a concrete beam structure reinforcing system in the embodiments of the application;
[0026] Figure 2 FIG. 2 is an A-A cross-sectional view of FIG. 1. Figure 1
[0027] BRIEF DESCRIPTION OF DRAWINGS
[0028] 100, bridge body; 101, support; 102, web; 200, beam end anchoring block; 300, span anchoring block; 400, turning anchoring block; 500, zigzag prestressed beam; 600, straight prestressed beam.
[0029] The specific embodiments of the application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings for the preferred embodiments of the present application to make the technical solutions in the embodiments of the present application more fully described. In the drawings, the same or similar notations represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all the embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.
[0031] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0033] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0034] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.
[0035] As described in the background, for the scenario of shear reinforcement of simply supported T-beam, it is necessary to bend the prestressed beam upward near the beam end. Considering the durability of the external beam protection structure caused by ultraviolet radiation, and the structure appearance and other problems, it is appropriate to add a structure to be arranged between two or more T-beams. At the same time, in order to improve the effectiveness of shear reinforcement, the anchoring point at the beam end should be arranged as much as possible on the upper part of the web, and the angle between the added prestress and the horizontal line should be as large as possible. However, for simply supported beams that usually use tensioning prestress at the beam end, in order to meet the space needs of post-anchoring tensioning jack arrangement and other requirements, the anchoring point can only be arranged near the middle of the web at the beam end, and enough operation space is required between the beam end diaphragm, so that the efficiency of external prestressed shear reinforcement of simply supported T-beam is often not high, and the effective range of reinforcement is limited.
[0036] Based on the above description, the concrete bridge reinforcement structure provided in one or more embodiments of the present application is described below with reference to the accompanying drawings.
[0037] As shown in Figure 1 , the concrete bridge reinforcement structure provided by the embodiments of the present application includes a bridge body 100, a beam end anchoring block 200, an inter-span anchoring block 300, a turning anchoring block 400, and a folded line prestressed beam 500.
[0038] The beam end anchoring block 200 is fixed to the beam end of the bridge body 100 in the length direction; the inter-span anchoring block 300 is fixed to the middle of the bridge body 100 in the length direction, and the horizontal height of the inter-span anchoring block 300 is lower than that of the beam end anchoring block 200; the turning anchoring block 400 is fixed to one side of the inter-span anchoring block 300 facing the beam end anchoring block 200; and one end of the folded line prestressed beam 500 is fixed in the inter-span anchoring block 300, and the other end is fixed in the beam end anchoring block 200 after passing through the turning anchoring block 400, and the folded line prestressed beam 500 is turned and bent by the turning anchoring block 400.
[0039] As can be seen from the above description, the concrete bridge reinforcement structure provided by the present application uses a folded line prestressed beam, which does not need to consider the post-anchoring tensioning space, but directly tensioning through one side of the inter-span anchoring block 300, reducing the tensioning design difficulty of the prestressed beam. At the same time, since the horizontal height of the inter-span anchoring block 300 is lower than that of the beam end anchoring block 200, the beam end anchoring point can be arranged on the upper part of the web 102 in the beam end direction, thereby increasing the folding angle of the folded line prestressed beam 500, providing greater vertical reaction force, and further improving the shear reinforcement efficiency of the beam body.
[0040] In the embodiments of the present application, as shown in Figure 1 and Figure 2As shown, the bridge body 100 is exemplarily a simply supported T-beam, and the lower end of the bridge body 100 is fixed with two symmetrical supports 101, and the span anchoring block 300 and the turning anchoring block 400 are both constructed in the gap between the two supports 101. In addition, the height direction, the width direction, the transverse direction and the vertical direction in the embodiment of the present application are described with reference to the orientation of the bridge body 100, which will not be described again hereinafter.
[0041] As shown, in some embodiments, along the length direction of the bridge body 100, the beam end portions on both sides of the bridge body 100 are respectively fixed with a beam end anchoring block 200, and the middle portion of the bridge body 100 is fixed with two span anchoring blocks 300; and a folded-line prestressed beam 500 is arranged between each span anchoring block 300 and the beam end anchoring block 200 on the same side. Figure 1
[0042] In the above scheme, the beam end anchoring block 200 is arranged on each beam end portion on both sides of the bridge body 100, and two span anchoring blocks 300 are arranged in the middle portion, so that the overall stability of the bridge structure is enhanced through distributed prestressed reinforcement, the bridge sides and the middle portion are uniformly reinforced, the stress of the bridge body 100 is more balanced, and the carrying capacity of the entire bridge is improved.
[0043] Further, the concrete bridge reinforcing structure further comprises a straight-line prestressed beam 600, and the two ends of the straight-line prestressed beam 600 are respectively fixedly connected with the two span anchoring blocks 300; the straight-line prestressed beam 600 is configured to serve as a bending-resistant reinforcing beam in a first anchoring state lower than the folded-line prestressed beam 500 and serve as a shear-resistant reinforcing beam in a second anchoring state higher than the folded-line prestressed beam 500.
[0044] In the above embodiment, in the first anchoring state, the bending-resistant reinforcement is the main effect, the straight-line prestressed beam 600 can be arranged below the folded-line prestressed beam 500, the distance between the straight-line prestressed beam 600 and the neutral axis of the relative cross section is increased, a larger additional pre-bending moment is provided, and the bending-resistant reinforcing efficiency is improved. In the second anchoring state, the shear-resistant reinforcement is the main effect, the folded-line prestressed beam 500 is arranged below the straight-line prestressed beam 600, the bending angle of the prestressed beam is increased, a higher vertical pre-shear force is provided, and the shear-resistant reinforcing efficiency is improved. The vertical spacing of the two groups of prestressed beams is preferably suitable for the arrangement of the tensioning device, which is not absolutely limited in the embodiment of the present application.
[0045] As shown, in some embodiments, along the width direction of the bridge body 100, the straight-line prestressed beam 600 has at least two groups arranged at intervals. Along the width direction of the bridge body 100, the folded-line prestressed beam 500 has at least two groups arranged at intervals, and the folded-line prestressed beam 500 and the straight-line prestressed beam 600 are both located on the web 102 side of the bridge body 100.
[0046] In the above scheme, the straight prestressed beam 600 and the folded-line prestressed beam 500 are arranged between the T-beam webs 102, avoiding the durability problems such as ultraviolet aging of the protective structure under sunlight. At the same time, the arrangement of at least two groups can further improve the overall shear reinforcement efficiency of the two topics.
[0047] Further, as shown in Figure 2 In the above scheme, the straight prestressed beam 600 and the folded-line prestressed beam 500 are arranged between the T-beam webs 102, avoiding the durability problems such as ultraviolet aging of the protective structure under sunlight. At the same time, the arrangement of at least two groups can further improve the overall shear reinforcement efficiency of the two topics.
[0048] Through the above arrangement, the action range of the two different types of prestressed beams can be avoided to interfere with each other, thereby effectively reducing the local stress concentration. The straight prestressed beam 600 and the folded-line prestressed beam 500 can both act at different positions, optimizing the stress distribution of the whole bridge, making the stress of the bridge structure more uniform, and improving the stability of the bridge.
[0049] As shown in Figure 1 The two beam end anchoring blocks 200 are located at the same horizontal height, and the two span anchoring blocks 300 are located at the same horizontal height. The turning anchoring blocks 400 are fixed at the quarter-point positions of the bridge span of the bridge body 100, and the two turning anchoring blocks 400 and the two span anchoring blocks 300 are symmetrically arranged.
[0050] In the above description, the beam end anchoring block 200, the span anchoring block 300, and the turning anchoring block 400 are symmetrically arranged in pairs. Specifically, along the length direction of the bridge body 100, the folded-line prestressed beam 500—straight prestressed beam 600—folded-line prestressed beam 500 are sequentially arranged. Among them, the span anchoring block 300 located in the middle jointly anchors and fixes the folded-line prestressed beam 500 and the straight prestressed beam 600.
[0051] In some embodiments, at least one of the beam end anchoring block 200, the span anchoring block 300, and the turning anchoring block 400 is a steel structure block; or, at least one of the beam end anchoring block 200, the span anchoring block 300, and the turning anchoring block 400 is a concrete pouring block.
[0052] The span anchoring cross beam and the beam end anchoring block 200 can adopt a concrete structure or a steel structure, and can be reliably anchored with the existing beam body through beam implantation of steel bars or anchor bolts. When a concrete structure is adopted, the anchor pad and the spiral reinforcement need to be accurately positioned and pre-buried before concrete pouring; when a steel structure is adopted, the local stress of the anchor lower pressure steel part needs to meet the requirements.
[0053] A turning anchor block 400 is provided with a turner for threading and bending the fold line prestressed beam 500 to the beam end anchor block 200. The turning block is arranged between the beam end anchor block 200 and the span anchor block 300, and can be arranged near the quarter point of the bridge span. The turning block can be a concrete structure or a steel structure, which can be reliably anchored with the existing beam body by embedding steel bars or anchors in the beam body. When a concrete structure is used, the turner needs to be accurately positioned and pre-buried before the concrete is poured; when a steel structure is used, the turner can be integrally welded with other steel parts during steel part manufacturing. Here, the turner can use the turning part in the related art, and the embodiments of the present application will not be described again.
[0054] The beneficial effects of the embodiments of the present application are that by arranging the end reverse fold line prestressed beam 500 and the middle straight line prestressed beam 600 between the T-beams, the prestressed beam end anchoring point can be arranged as much as possible on the upper part of the web 102 in the direction of the beam end, thereby increasing the prestressed beam fold angle, providing greater vertical reaction force, and further improving the shear reinforcement efficiency of the beam body; at the same time, the length of the shear reinforcement area at the beam end can also be increased, and the effective range of shear reinforcement can be improved; moreover, the prestressed beam is arranged between the webs 102 of the T-beams, which avoids the durability problems such as ultraviolet aging of the protective structure under sunlight.
[0055] The construction process of the concrete bridge reinforcement structure of the embodiments of the present application is exemplarily performed as follows, and the beam body in the following description is the bridge body 100.
[0056] (1) Beam body lofting and drilling
[0057] The positions of the prestressed steel bars and ordinary steel bars are detected and marked within the beam body drilling range, the drilling positions of the respective anchor blocks are determined according to the design requirements and actual conditions, and drilling is performed. The actual drilling positions can be adjusted according to the steel bar detection and trial drilling results, and the original prestressed steel bars and steel bars of the beam body should not be damaged.
[0058] (2) Beam body embedded steel bars (anchors)
[0059] Before embedding the steel bars (anchors), the beam body drilling hole should be thoroughly cleaned and dried by using a high-pressure air gun. The embedded steel bars (anchors) should be perpendicular to the surface of the beam body, and after the steel bars (anchors) are embedded in the beam body and the glue solidifies (the curing time is not less than 3 days), at least one steel bar (anchor) is randomly selected at each anchoring and turning component for on-site pull-out test.
[0060] (4) Anchoring and turning component construction
[0061] For anchoring and steering concrete members, according to the design requirements, the anchoring and steering member steel bars are bound, the anchor and the steering device are simultaneously embedded, the anchor and the steering device are fixed with the positioning bars and the steel bar cage, the positioning is confirmed to be correct, then the formwork is erected, and then the concrete is poured under the condition of closed traffic and timely curing.
[0062] For anchoring and steering steel members, according to the design requirements, the anchoring and steering steel members are processed in the factory, the opening position of the anchor bolt hole on the anchoring and steering steel member is determined according to the actual implantation position of the beam body anchor bolt, and the hole is opened. The anchoring and steering steel members are installed on site, and anticorrosion coating is performed.
[0063] (5) Pre-stressed steel bar blanking and installation
[0064] After the anchoring and steering member construction is completed, the beam end anchoring block 200, the span anchoring block 300 and the steering anchoring block 400 are obtained, the pre-stressed steel bar anchoring point spacing is measured to determine the blanking length, and then the pre-stressed beam is threaded, and the anchor and the clamp are installed.
[0065] (6) Pre-stressed beam tensioning
[0066] According to the stress needs of the beam body and the span anchoring block 300, the reverse pull folded line pre-stressed beam 500 and the straight line pre-stressed beam 600 are tensioned in batches, and single-end tensioning can be used, wherein the tensioning end of the reverse pull folded line pre-stressed beam 500 is located at the middle anchoring beam, and the tensioning end of the straight line pre-stressed beam 600 can be symmetrically arranged about the midspan. The pre-stressed force is tensioned in stages, and the tensioning force and the elongation are double controlled.
[0067] (7) Installation of post-anchoring protection device
[0068] The pre-stressed beam under the anchor is sealed and protected according to the requirements, and the post-anchoring protection device is installed.
[0069] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.
[0070] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.
Claims
1. A reinforced concrete bridge structure, characterized in that, include: Bridge body (100); Beam end anchoring block (200) is fixed to the beam end along the length direction of the bridge body (100); A span anchor block (300) is fixed at the middle of the length direction of the bridge body (100), and the horizontal height of the span anchor block (300) is lower than the horizontal height of the beam end anchor block (200); A turning anchor block (400) is fixed to the side of the span anchor block (300) facing the beam end anchor block (200); One end of the broken-line prestressed tendon (500) is fixed in the span anchor block (300), and the other end passes through the turning anchor block (400) and is fixed in the beam end anchor block (200). The broken-line prestressed tendon (500) is turned and bent by the turning anchor block (400).
2. The concrete bridge reinforcement structure according to claim 1, characterized in that, Along the length of the bridge body (100), a beam end anchor block (200) is fixed at the beam ends on both sides of the bridge body (100), and two span anchor blocks (300) are fixed at intervals in the middle of the bridge body (100). A zigzag prestressed tendon (500) is threaded between each of the span anchor blocks (300) and the beam end anchor blocks (200) on the same side.
3. The concrete bridge reinforcement structure according to claim 2, characterized in that, Also includes: The straight prestressed tendon (600) is fixedly connected at both ends to the two span anchor blocks (300) respectively; The linear prestressed tendon (600) is configured to act as a bending strengthening tendon in a first anchorage state below the broken-line prestressed tendon (500) and as a shear strengthening tendon in a second anchorage state above the broken-line prestressed tendon (500).
4. The concrete bridge reinforcement structure according to claim 3, characterized in that, Along the width direction of the bridge body (100), the linear prestressed tendons (600) have at least two sets spaced apart.
5. The concrete bridge reinforcement structure according to claim 4, characterized in that, Along the width direction of the bridge body (100), the broken-line prestressed tendons (500) have at least two sets spaced apart, and both the broken-line prestressed tendons (500) and the straight prestressed tendons (600) are located on the web (102) side of the bridge body (100).
6. The concrete bridge reinforcement structure according to claim 5, characterized in that, The orthographic projection of the linear prestressed tendon (600) on the ground does not overlap with the orthographic projection of the polygonal prestressed tendon (500) on the ground.
7. The concrete bridge reinforcement structure according to claim 1, characterized in that, The two beam end anchor blocks (200) are located at the same horizontal height, and the two span anchor blocks (300) are located at the same horizontal height.
8. The concrete bridge reinforcement structure according to claim 1, characterized in that, The turning anchor block (400) is fixed at the quarter point of the bridge span of the bridge body (100), and the two turning anchor blocks (400) and the two span anchor blocks (300) are arranged symmetrically.
9. The concrete bridge reinforcement structure according to claim 1, characterized in that, At least one of the beam end anchor block (200), the span anchor block (300), and the turning anchor block (400) is a steel structure block; or, at least one of the beam end anchor block (200), the span anchor block (300), and the turning anchor block (400) is a concrete casting block.
10. The concrete bridge reinforcement structure according to claim 1, characterized in that, The steering anchor block (400) is equipped with a steering device, which is used to pass through the broken line prestressed tendon (500) and bend and guide it to the beam end anchor block (200).