Adjustable steering block device for reinforcing external prestressed tendon of bridge

Abstract

The utility model relates to an adjustable steering block device for reinforcing external prestressed tendons of a bridge. The adjustable steering block device comprises a hollow slab beam and a steering block device body arranged on the lower side of the hollow slab beam. The steering block device comprises a bottom plate and a screw supporting plate located below the bottom plate, at least one set of adjusting screws are arranged between the bottom plate and the screw supporting plate, each set comprises two vertically-arranged adjusting screws, a steering block is arranged between the two adjusting screws in the same set, the section of the steering block is semicircular, and the arc-shaped face of the steering block faces downwards. The adjusting screw rod is in threaded connection with an upper adjusting nut and a lower adjusting nut which are used for clamping the end of the steering block in a matched mode. According to the adjustable steering block device for reinforcing the external prestressed tendon of the bridge, the damage degree to the bridge is small, the construction efficiency is high, the steering block is detachably installed, consumables are few, the height of the steering block can be adjusted by matching the adjusting screw rod with the adjusting nut, and the use is convenient. The height of the steering block can be directly adjusted according to the condition of prestress relaxation to improve the prestress degree of the prestressed tendon.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement, in particular to an adjustable turning block device for external prestressed tendons of bridges. Background Technique

[0002] External prestressed reinforcement is a post-tensioned prestressed reinforcement method in which external prestressed tendons are arranged outside the cross-section of structural members, and prestress is transmitted to the structure through the anchorage area and the turning block. Most of the existing turning block designs in external prestressed reinforcement schemes are integral, and the height of the turning block cannot be adjusted. Moreover, most turning blocks cannot be moved or disassembled, and the problems such as stress relaxation in the service stage of prestressed tendons are also ignored. After using for a period of time, prestress relaxation leads to the reinforcement effect not reaching the expected level. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide an adjustable turning block device for external prestressed tendons of bridges, which can adjust the height of the turning block and improve the prestress of the prestressed tendons.

[0004] The utility model adopts the following scheme: an adjustable turning block device for external prestressed tendons of bridges, including a hollow slab beam and a turning block device arranged on the lower side of the hollow slab beam; the turning block device includes a bottom plate and a screw support plate located below the bottom plate. At least one group, with two vertically arranged adjusting screws in each group, is provided between the bottom plate and the screw support plate. A turning block is arranged between the two adjusting screws in the same group. The cross-section of the turning block is semicircular and the arc surface faces downward. Upper adjusting nuts and lower adjusting nuts are threadedly connected to the adjusting screws to cooperate with clamping the ends of the turning block.

[0005] Further, a pair of limiting plates distributed on both sides of the adjusting screws are welded on the lower side surface of the bottom plate. A limiting groove is formed between the two limiting plates on both sides. A cushion block is arranged in the limiting groove and is padded above the turning block. Notches for hooking on the adjusting screws are arranged at both ends of the cushion block.

[0006] Further, the bottom plate is fixed to the lower side of the hollow slab beam through an anchoring device; the anchoring device includes a cushion plate padded between the bottom plate and the bottom surface of the hollow slab beam and an anchoring screw penetrating through the hollow slab beam along the width direction of the hollow slab beam. Anchoring plates that are bent upward and attached to the side surface of the hollow slab beam are arranged at both ends of the cushion plate. After the end of the anchoring screw passes through the anchoring plate, it is locked by an anchoring nut.

[0007] Further, the bottom plate and the cushion plate are connected by bolts; the anchoring screw is close to the bottom surface of the inner cavity of the hollow slab beam, and a screw cushion plate is arranged between the anchoring screw and the bottom surface of the inner cavity of the hollow slab beam.

[0008] Further, first stiffening rib plates are welded between both ends of the screw support plate and the bottom plate, and second stiffening rib plates are welded between the outer side surfaces of the first stiffening rib plates and the bottom plate.

[0009] Further, semi-circular grooves adapted to the adjusting screw are provided at both ends of the steering block.

[0010] Further, the steering block device further includes an outer shield, and the shield is connected to the bottom plate by bolts.

[0011] Compared with the prior art, the present utility model has the following beneficial effects: The adjustable external prestressed tendon reinforcement steering block device of the present utility model causes less damage to the bridge, has high construction efficiency, the steering block is detachably installed, with less consumables, and the height of the steering block can be adjusted by using the adjusting screw in cooperation with the adjusting nut. In case of prestress relaxation, the height of the steering block can be directly adjusted to increase the prestress of the prestressed tendon; the horizontal position layout is flexible, reducing the construction difficulty and meeting the layout requirements of steering blocks at different positions.

[0012] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the usage state of the steering block device according to an embodiment of the present utility model;

[0014] Figure 2 Schematic diagram of the steering block device according to an embodiment of the present utility model;

[0015] Figure 3 Elevation view of the steering block device according to an embodiment of the present utility model;

[0016] Figure 4 Cross-sectional view of the steering block device according to an embodiment of the present utility model;

[0017] Figure 5 Schematic diagram of the adjusting bolt according to an embodiment of the present utility model;

[0018] Figure 6 Schematic diagram of the first cushion block according to an embodiment of the present utility model;

[0019] Figure 7 Schematic diagram of the second cushion block according to an embodiment of the present utility model;

[0020] Figure 8 Schematic diagram of the steering block according to an embodiment of the present utility model;

[0021] Description of reference numerals in the figure: 1 - shield, 2 - screw support plate, 201 - first stiffening rib, 202 - second stiffening rib; 3 - prestressed tendon, 4 - turning block, 5 - adjusting device, 501 - adjusting screw, 502 - lower adjusting nut, 503 - upper adjusting nut, 504 - limiting plate, 505 - first cushion block, 506 - second cushion block, 6 - bottom plate, 7 - anchoring device, 701 - backing plate, 702 - anchoring nut, 703 - anchoring screw, 704 - screw backing plate; 8 - hollow slab beam, 9 - bridge deck, 10 - prestressed tendon clamp. Detailed implementation manners

[0022] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0023] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] As Figures 1-8 As shown, an adjustable external prestressed tendon reinforcement turning block device for a bridge includes a hollow slab beam 8 and a turning block device provided on the lower side of the hollow slab beam 8; the turning block device includes a bottom plate 6 and a screw support plate 2 located below the bottom plate 6. At least one group, with two vertically arranged adjusting screws 501 in each group, is provided between the bottom plate 6 and the screw support plate. The upper end of the adjusting screw 501 is welded to the bottom plate, and the lower end is welded to the screw support plate 2. A turning block 4 is provided between the two adjusting screws 501 in the same group. The cross-section of the turning block 4 is semicircular and the arc surface faces downward. The axis direction of the turning block is perpendicular to the length direction of the hollow slab beam. The adjusting screws are arranged along the width direction of the hollow slab beam. Threaded on the adjusting screw 501 are an upper adjusting nut 503 and a lower adjusting nut 502 for cooperatively clamping the end of the turning block; the number of turning blocks 4 and the corresponding number of groups of adjusting screws 501 are determined according to the number of prestressed tendons. The utility model can adjust the height of the turning block by using the adjusting screw in cooperation with the adjusting nut. In case of prestress relaxation, the height of the turning block can be directly adjusted to increase the prestress degree of the prestressed tendon; and it has the advantages of less damage to the bridge and high construction efficiency. The horizontal position of the turning block is flexibly arranged, reducing the construction difficulty and meeting the layout requirements of turning blocks at different positions.

[0025] The upper adjusting nut 503 needs to be adjusted to the highest position first, so that the height of the steering block 4 is also at the highest. The prestressed tendon 3 is fixed at both ends of the hollow slab beam 8 by prestressed tendon clamps and bypasses from the lower side of the steering block 4. By adjusting the height of the upper adjusting nut 503, the steering block 4 moves downward to provide an initial stress for the prestressed tendon. When the steering block 4 reaches the designed position, the lower adjusting nut 502 is tightened, and the height position of the steering block is fixed by the upper and lower adjusting nuts.

[0026] In this embodiment, a pair of limiting plates 504 distributed on both sides of the adjusting screw are welded to the lower side surface of the bottom plate 6. A limiting groove is formed between the two limiting plates on both sides. A cushion block is arranged in the limiting groove and is padded above the steering block. Notches for hooking on the adjusting screw are arranged at both ends of the cushion block; the cushion blocks are respectively a first cushion block 505 and a second cushion block 506. The first cushion block 505 is in a flat plate shape, and the second cushion block 506 is composed of a flat main plate and a supporting block located on the lower side of the main plate, wherein the supporting block is used to support the upper surface of the steering block; the second cushion block 506 is necessary, while the first cushion block 505 is adopted as needed. When the thickness of the second cushion block is insufficient, the first cushion block 505 is padded above the second cushion block 506, and the two are combined into a cushion block with a suitable height; therefore, the cushion block is composed of a second cushion block 506 and an appropriate number (which can also be 0) of first cushion blocks, and the cushion block is used to ensure the reliable support of the steering block 4 and improve the overall stiffness of the steering block device.

[0027] The adjusting screw 501, the lower adjusting nut 502, the upper adjusting nut 503, the limiting plate 504, the first cushion block 505, and the second cushion block 506 constitute an adjusting device for adjusting the steering block.

[0028] In this embodiment, the bottom plate 6 is fixed to the lower side of the hollow slab beam 8 through an anchoring device 7, and the anchoring device 7 ensures the reliable connection between the steering block device and the hollow slab beam; the anchoring device 7 includes a backing plate 701 padded between the bottom plate 6 and the bottom surface of the hollow slab beam 8 and an anchoring screw 703 penetrating through the hollow slab beam in the width direction of the hollow slab beam. The two ends of the backing plate are provided with anchoring plates that are bent upward and attached to the side surface of the hollow slab beam, and the end of the anchoring screw passes through the anchoring plate and is locked by an anchoring nut 702.

[0029] In this embodiment, the bottom plate and the backing plate are connected by bolts; the anchoring screw is close to the bottom surface of the inner cavity of the hollow slab beam, and a screw backing plate 704 is arranged between the anchoring screw and the bottom surface of the inner cavity of the hollow slab beam.

[0030] In this embodiment, first stiffening ribs 201 are welded between both ends of the screw support plate 2 and the bottom plate, and second stiffening ribs 202 are welded between the outer side surface of the first stiffening ribs and the bottom plate to increase the stability of the entire steering block system.

[0031] In this embodiment, semi-circular grooves adapted to the adjusting screw are provided at both ends of the turning block to prevent the turning block from shifting in position, so that the prestressed tendon profile after construction is consistent with the designed profile, ensuring the effect of prestressed reinforcement.

[0032] In this embodiment, the turning block device further includes an outer shield 1, which is connected to the bottom plate by bolts, and holes for the prestressed tendon to pass through are provided on both sides of the shield.

[0033] The method for strengthening the external prestressed tendons of a bridge adopts the adjustable external prestressed tendon strengthening turning block device for a bridge as described above, and includes the following steps:

[0034] (1) Determine the installation position and quantity of the turning block device on the bridge, determine the dimensions of the turning block 4 and the bottom plate 6 and the length of the adjusting screw 501, fabricate the turning block device, and weld the adjusting screw 501, the screw support plate 2, the first stiffening rib 201, the second stiffening rib 202 and the limiting plate to the bottom plate 6;

[0035] (2) Install the anchoring device at the installation position of the turning block device, drill holes at the positions where the anchoring screws 703 pass through the hollow slab beam, place screw pads (704) on the bottom surface of the inner cavity of the hollow slab beam, position the pad 701 under the hollow slab beam by passing the anchoring screws 703 through the anchoring plates of the hollow slab beam and the pad, and then install adjusting nuts 702 at both ends of the anchoring screws. At this time, the anchoring nuts 702 do not need to be tightened;

[0036] (3) Fasten the bottom plate of the turning block device to the pad by bolts, and clamp the turning block 4 between the upper adjusting nut 503 and the lower adjusting nut 502;

[0037] (4) Adjust the upper adjusting nut 503 to the highest position so that the turning block 4 is at the highest position. Fix the prestressed tendon 3 at both ends of the hollow slab beam with prestressed tendon clamps 10, and bypass the prestressed tendon 3 from the lower side of the corresponding turning block 4;

[0038] (5) Move the turning block 4 downward by adjusting the positions of the upper adjusting nut 503 and the lower adjusting nut 502 on the adjusting screw 501. When the turning block 4 reaches the designed position, tighten the lower adjusting nut 502, and pad a block above the turning block 4 to ensure reliable support for the turning block 4;

[0039] (6) After the construction of the turning block 4 is completed, fix the shield 1 to the bottom plate 6 by bolts;

[0040] (7) Tighten the anchoring nut 702 to make the connection between the pad 701 and the hollow slab beam 8 reliable.

[0041] For any of the technical solutions disclosed by the present utility model, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical values with obvious technical effects or representativeness among many implementable numerical values. Since there are too many numerical values to enumerate, only some numerical values are disclosed in the present utility model to illustrate the technical solutions of the present utility model. Moreover, the listed numerical values should not constitute a limitation on the protection scope of the present utility model.

[0042] If the present utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using bolts or screws), or can also be understood as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (such as manufactured by integral forming using a casting process) (except when it is obviously impossible to use the integral forming process).

[0043] In addition, for any of the technical solutions disclosed by the present utility model, the terms used to represent the positional relationship or shape, unless otherwise stated, include states or shapes that are approximate, similar, or close to them.

[0044] Any component provided by the present utility model can either be assembled from multiple separate components or be a single component manufactured by an integral forming process.

[0045] The above is only a preferred embodiment of the present utility model and does not limit the present utility model in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution content of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An adjustable bridge external prestressed tendon reinforcement steering block device, characterized in that: It includes a hollow slab beam and a steering block device arranged on the lower side of the hollow slab beam; the steering block device includes a base plate and a screw support plate located below the base plate, at least one group of two vertically arranged adjusting screws are arranged between the base plate and the screw support plate, a steering block is arranged between the two adjusting screws in the same group, the steering block has a semicircular cross-section and the arc surface faces downward, and the adjusting screw is threadedly connected with an upper adjusting nut and a lower adjusting nut for clamping the end of the steering block.

2. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 1 is characterized in that: A pair of limit plates distributed on both sides of the adjusting screw are welded on the lower side of the bottom plate, and a limit groove is formed between the limit plates on both sides. A pad is arranged in the limit groove and is padded above the steering block. Notches hooked on the adjusting screw are arranged at both ends of the pad.

3. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 1 is characterized in that: The bottom plate is fixed to the lower side of the hollow slab beam by an anchoring device; the anchoring device includes a pad between the bottom plate and the bottom surface of the hollow slab beam and an anchoring screw that penetrates the hollow slab beam along the width direction of the hollow slab beam, and anchoring plates that are bent upward and attached to the side surfaces of the hollow slab beam are provided at both ends of the pad. The ends of the anchoring screws are locked by anchoring nuts after passing through the anchoring plates.

4. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 3 is characterized in that: The bottom plate and the pad are connected by bolts; the anchor screw is close to the bottom surface of the inner cavity of the hollow slab beam, and a screw pad is provided between the anchor screw and the bottom surface of the inner cavity of the hollow slab beam.

5. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 1 is characterized in that: A first stiffening rib is welded between the two ends of the screw support plate and the bottom plate, and a second stiffening rib is welded between the outer side surface of the first stiffening rib and the bottom plate.

6. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 1 is characterized in that: Both ends of the steering block are provided with semicircular grooves adapted to the adjusting screw rod.

7. The adjustable bridge external prestressed tendon reinforcement steering block device according to claim 1 is characterized in that: The steering block device also includes a shield located outside, and the shield is connected to the base plate by bolts.

Images