Adjustable bridge external prestressed tendon reinforcing deflection block device and reinforcing method

Abstract

The application relates to a bridge external prestressed tendon reinforcing deflection block device and a reinforcing method, which comprises a hollow slab beam and a deflection block device arranged on the lower side of the hollow slab beam; the deflection block device comprises a bottom plate and a screw rod supporting plate arranged below the bottom plate; at least one group of two vertically arranged adjusting screw rods is arranged between the bottom plate and the screw rod supporting plate; a deflection block is arranged between the two adjusting screw rods in the same group; the cross section of the deflection block is semicircular, and the arc surface faces downward; and an upper adjusting nut and a lower adjusting nut for clamping the end of the deflection block are threadedly connected to the adjusting screw rod. The bridge external prestressed tendon reinforcing deflection block device has the advantages of less damage to the bridge, high construction efficiency, detachable installation of the deflection block, less material consumption, height adjustment of the deflection block by the adjusting screw rod and the adjusting nut, and direct height adjustment of the deflection block for the prestress relaxation to improve the prestress degree of the prestressed tendon.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge reinforcement, in particular to an adjustable bridge external prestressed tendon reinforcement deflection block device and a reinforcement method. BACKGROUND

[0002] External prestressed reinforcement is a post-tensioned prestressed reinforcement method in which external prestressed tendons are arranged outside the cross section of the structural member, and the prestress is transmitted to the structure through the anchoring zone and the deflection block. The existing external prestressed reinforcement scheme adopts a whole deflection block design, the height of the deflection block cannot be adjusted, most of the deflection blocks cannot be moved and disassembled, and the problems of stress relaxation and the like existing in the use stage of the prestressed tendons are ignored, and the reinforcement effect cannot reach the expectation after a period of use due to prestress relaxation. SUMMARY

[0003] Therefore, the present application aims to provide an adjustable bridge external prestressed tendon reinforcement deflection block device and a reinforcement method, which can adjust the height of the deflection block and improve the prestress degree of the prestressed tendon.

[0004] The present application adopts the following scheme: an adjustable bridge external prestressed tendon reinforcement deflection block device, comprising a hollow slab beam and a deflection block device arranged on the lower side of the hollow slab beam; the deflection block device comprises a bottom plate and a screw support plate located below the bottom plate, at least one group of two vertically arranged adjusting screws is arranged between the bottom plate and the screw support plate, a deflection block is arranged between the two adjusting screws in the same group, the cross section of the deflection block is semicircular and the arc surface faces downward, and an upper adjusting nut and a lower adjusting nut for clamping the end of the deflection block are threadedly connected to the adjusting screw.

[0005] Further, a pair of limiting plates distributed on the two sides of the adjusting screw are welded to the lower side of the bottom plate, a limiting groove is formed between the two limiting plates, a pad block is arranged in the limiting groove and located above the deflection block, and notches are arranged at both ends of the pad block and hooked on the adjusting screw.

[0006] Further, the bottom plate is fixed to the lower side of the hollow slab beam through an anchoring device; the anchoring device comprises a pad plate arranged 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, the two ends of the pad plate are bent upward and abut against the side surface of the hollow slab beam, and the end of the anchoring screw is locked by an anchoring nut after penetrating through the anchoring plate.

[0007] Further, the bottom plate and the pad 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 pad plate is arranged between the anchoring screw and the bottom surface of the inner cavity of the hollow slab beam.

[0008] Further, the first stiffening rib plate is welded between the two ends of the screw support plate and the bottom plate, and the second stiffening rib plate is welded between the outer side of the first stiffening rib plate and the bottom plate.

[0009] Further, the turning block is provided with a semicircular groove matched with the adjusting screw at the two ends.

[0010] Further, the turning block device further comprises an external cover which is connected to the bottom plate by bolts.

[0011] Another technical solution of the present application is a bridge external prestressed tendon reinforcing method, which adopts the adjustable bridge external prestressed tendon reinforcing turning block device as described above, and comprises the following steps:

[0012] (1) determining the installation position and quantity of the turning block device on the bridge;

[0013] (2) installing the anchoring device at the installation position of the turning block device, and the anchor nut does not need to be tightened;

[0014] (3) fastening the bottom plate of the turning block device and the pad plate by bolts, and clamping the turning block between the upper adjusting nut and the lower adjusting nut;

[0015] (4) making the turning block be at the highest position, fixing the prestressed tendon at both ends of the hollow slab beam by using the prestressed tendon clamp, and winding the prestressed tendon from the lower side of the corresponding turning block;

[0016] (5) moving the turning block downward by adjusting the positions of the upper adjusting nut and the lower adjusting nut on the adjusting screw, tightening the lower adjusting nut when the turning block reaches the designed position, and placing the pad above the turning block to ensure the reliable support of the turning block;

[0017] (6) after the construction of the turning block is completed, fixing the cover on the bottom plate by bolts;

[0018] (7) tightening the anchor nut to reliably connect the pad plate and the hollow slab beam.

[0019] Compared with the prior art, the adjustable bridge external prestressed tendon reinforcing turning block device has the following beneficial effects: the device has less damage to the bridge, high construction efficiency, and the turning block is detachably installed, which consumes less material; the height of the turning block can be adjusted by using the adjusting screw and the adjusting nut, the prestress degree of the prestressed tendon can be improved by directly adjusting the height of the turning block according to the prestress relaxation, the horizontal position is arranged flexibly, the construction difficulty is reduced, and the turning block arrangement requirements of different positions are met.

[0020] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The schematic diagram of the turning block device used in the embodiment of the present application is shown in the figure;

[0022] Figure 2 The schematic diagram of the turning block device used in the embodiment of the present application is shown in the figure;

[0023] Figure 3 The schematic diagram of the turning block device used in the embodiment of the present application is shown in the figure;

[0024] Figure 4 The schematic diagram of the turning block device used in the embodiment of the present application is shown in the figure;

[0025] Figure 5 The schematic diagram of the adjusting screw used in the embodiment of the present application is shown in the figure;

[0026] Figure 6 The schematic diagram of the first pad used in the embodiment of the present application is shown in the figure;

[0027] Figure 7 The schematic diagram of the second pad used in the embodiment of the present application is shown in the figure;

[0028] Figure 8 The schematic diagram of the turning block used in the embodiment of the present application is shown in the figure;

[0029] Figure legend: 1 - shroud, 2 - screw support plate, 201 - first stiffener, 202 - second stiffener; 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 pad, 506 - second pad, 6 - bottom plate, 7 - anchoring device, 701 - pad, 702 - anchoring nut, 703 - anchoring screw, 704 - screw pad; 8 - hollow slab beam, 9 - bridge deck slab, 10 - prestressed tendon clamp. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0032] As Figures 1-8As shown, the adjustable bridge external prestressed tendon reinforcement turning block device comprises a hollow slab beam 8 and a turning block device arranged at the lower side of the hollow slab beam 8; the turning block device comprises a bottom plate 6 and a screw rod support plate 2 arranged below the bottom plate 6, at least one group of two vertically arranged adjusting screw rods 501 is arranged between the bottom plate 6 and the screw rod support plate 2, the upper end of the adjusting screw rod 501 is welded with the bottom plate, the lower end is welded with the screw rod support plate 2, a turning block 4 is arranged between the two adjusting screw rods 501 in the same group, the cross section of the turning block 4 is semicircular and the arc surface faces downward, the axial direction of the turning block is perpendicular to the length direction of the hollow slab beam, the adjusting screw rod is arranged along the width direction of the hollow slab beam, the upper adjusting screw nut 503 and the lower adjusting screw nut 502 for cooperating with the clamping end of the turning block are threadedly connected with the adjusting screw rod 501; the number of the turning blocks 4 and the number of the corresponding adjusting screw rod 501 groups are determined according to the number of the prestressed tendons. The height of the turning block can be adjusted by the adjusting screw rod and the adjusting screw nut, the height of the turning block can be directly adjusted to improve the prestress degree of the prestressed tendon according to the prestress relaxation, the bridge damage degree is small, the construction efficiency is high, the horizontal position of the turning block is arranged flexibly, the construction difficulty is reduced and the turning block layout requirement of different positions is met.

[0033] The upper adjusting screw nut 503 needs to be adjusted to the highest position first, the height of the turning block 4 is also at the highest position, the prestressed tendon 3 is fixed at both ends of the hollow slab beam 8 by using the prestressed tendon clamp and passes below the turning block 4, the height of the turning block 4 is adjusted by adjusting the height of the upper adjusting screw nut 503, the turning block 4 moves downward to provide the initial stress for the prestressed tendon, the lower adjusting screw nut 502 is tightened when the turning block 4 reaches the design position, the height position of the turning block is fixed by the upper and lower adjusting screw nuts.

[0034] In the embodiment, a pair of limiting plates 504 distributed on both sides of the adjusting screw rod are welded on the lower side of the bottom plate 6, a limiting groove is formed between the two limiting plates, a pad block is arranged in the limiting groove and pads above the turning block, slot openings are arranged on both ends of the pad block and hooked on the adjusting screw rod; the pad block is a first pad block 505 and a second pad block 506, the first pad block 505 is flat, the second pad block 506 is composed of a flat main plate and a support block arranged below the main plate, wherein the support block is used to top the upper surface of the turning block; the second pad block 506 must be used, and the first pad block 505 is used according to the requirement, when the thickness of the second pad block is insufficient, the first pad block 505 is padded above the second pad block 506, and the two are combined into a pad block with a suitable height; therefore, the pad block is composed of one second pad block 506 and a proper number (which can be 0) of first pad blocks, the pad block is used to ensure the reliable support of the turning block 4 and improve the overall rigidity of the turning block device.

[0035] 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.

[0036] In the embodiment, the bottom plate 6 is fixed to the lower side of the hollow slab beam 8 through the anchoring device 7, which ensures reliable connection between the steering block device and the hollow slab beam; the anchoring device 7 comprises a cushion plate 701 cushioned between the bottom plate 6 and the bottom surface of the hollow slab beam 8 and an anchoring screw 703 penetrating the hollow slab beam along the width direction of the hollow slab beam, the two ends of the cushion plate are provided with anchoring plates bent upward and attached to the side surface of the hollow slab beam, and the end of the anchoring screw is locked by the anchoring nut 702 after penetrating the anchoring plate.

[0037] In the embodiment, the bottom plate and the cushion plate are connected through bolts; the anchoring screw is close to the bottom surface of the inner cavity of the hollow slab beam, and a screw cushion plate 704 is arranged between the anchoring screw and the bottom surface of the inner cavity of the hollow slab beam.

[0038] In the embodiment, first stiffening rib plates 201 are welded between the two ends of the screw support plate 2 and the bottom plate, and second stiffening rib plates 202 are welded between the outer side surfaces of the first stiffening rib plates and the bottom plate, so as to increase the stability of the whole steering block system.

[0039] In the embodiment, the two ends of the steering block are provided with semicircular grooves matched with the adjusting screw, so as to avoid the position of the steering block from being deviated, make the prestressed tendon bundle type consistent with the designed linear type after the construction is completed, and ensure the effect of prestressed reinforcement.

[0040] In the embodiment, the steering block device further comprises an external protective cover 1, the protective cover is connected to the bottom plate through bolts, and holes for the prestressed tendon to pass through are formed in the two sides of the protective cover.

[0041] A bridge external prestressed tendon reinforcement method adopts the adjustable bridge external prestressed tendon reinforcement steering block device as described above, and comprises the following steps:

[0042] (1) determining the installation position and quantity of the steering block device on the bridge, determining the size of the steering block 4 and the bottom plate 6 and the length of the adjusting screw 501, and manufacturing the steering block device, wherein the adjusting screw 501, the screw support plate 2, the first stiffening rib 201, the second stiffening rib 202 and the limiting plate are welded on the bottom plate 6;

[0043] (2) installing the anchoring device at the installation position of the steering block device, punching holes at the position where the anchoring screw 703 penetrates the hollow slab beam, placing the screw cushion plate (704) on the bottom surface of the inner cavity of the hollow slab beam, positioning the cushion plate 701 to the lower part of the hollow slab beam through the anchoring screw 703 penetrating the hollow slab beam and the anchoring plate of the cushion plate, and then installing the adjusting nut 702 on the two ends of the anchoring screw, at this time, the adjusting nut 702 does not need to be tightened;

[0044] (3) the bottom plate of the steering block device is fastened with the gusset plate through bolt connection, the steering block 4 is clamped between the upper adjusting nut 503 and the lower adjusting nut 502;

[0045] (4) the upper adjusting nut 503 is adjusted to the highest position, the steering block 4 is located at the highest position, the prestressed tendon 3 is fixed at both ends of the hollow slab beam using the prestressed tendon clamp 10, and the prestressed tendon 3 is bypassed from the lower side of the corresponding steering block 4;

[0046] (5) the steering block 4 is moved downward by adjusting the positions of the upper adjusting nut 503 and the lower adjusting nut 502 on the adjusting screw 501, the lower adjusting nut 502 is tightened when the steering block 4 reaches the designed position, and the cushion block is placed above the steering block 4 to ensure reliable support of the steering block 4;

[0047] (6) after the construction of the steering block 4 is completed, the shroud 1 is fixed on the bottom plate 6 through bolts;

[0048] (7) the anchor nut 702 is tightened, so that the gusset plate 701 and the hollow slab beam 8 are reliably connected.

[0049] Any technical solution disclosed in the above application, 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 one of the many implementable values with more obvious technical effects or representative values. Because there are too many values, it is impossible to enumerate, therefore, the present application discloses part of the values to illustrate the technical solutions of the present application, and the above enumerated values should not constitute a limitation on the protection scope of the present application.

[0050] If the present application discloses or involves mutually fixed and connected parts or structural members, unless otherwise stated, the fixed connection can be understood as: detachable fixed connection (for example, using bolt or screw connection), and can also be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming process) (obviously, except for integral forming process).

[0051] In addition, the terms used to represent the position relationship or shape in any technical solution disclosed in the above application, unless otherwise stated, its meaning includes the approximate, similar or close state or shape.

[0052] Any component provided by the present application can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0053] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application to other forms, and any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application, and according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. An adjustable bridge external prestressed tendon reinforcement turning block device, characterized in that: The application relates to a hollow slab beam and a steering block device arranged on the lower side of the hollow slab beam, wherein the steering block device comprises a bottom plate and a screw rod supporting plate arranged below the bottom plate, at least one group of two vertically arranged adjusting screws is arranged between the bottom plate and the screw rod supporting plate, a steering block is arranged between the two adjusting screws of the same group, the steering block is semicircular in cross section and the arc-shaped surface faces downward, an upper adjusting nut and a lower adjusting nut are threadedly connected on the adjusting screw and used for clamping the end of the steering block, the bottom plate is fixed to the lower side of the hollow slab beam through an anchoring device, the anchoring device comprises a pad plate arranged between the bottom plate and the bottom surface of the hollow slab beam and an anchoring screw rod penetrating through the hollow slab beam along the width direction of the hollow slab beam, the two ends of the pad plate are bent upward and the anchoring plates are attached to the side surface of the hollow slab beam, the end of the anchoring screw rod is locked by an anchoring nut after penetrating through the anchoring plate, first stiffening rib plates are welded between the two ends of the screw rod supporting plate and the bottom plate, second stiffening rib plates are welded between the outer side surface of the first stiffening rib plates and the bottom plate, semicircular grooves matched with the adjusting screws are arranged at the two ends of the steering block, the upper end of the adjusting screw is welded to the bottom plate and the lower end is welded to the screw rod supporting plate, the pad blocks are respectively first pad blocks and second pad blocks, the first pad blocks are flat plates, the second pad blocks are composed of flat main plates and supporting blocks arranged on the lower side of the main plates and used for supporting the upper surface of the steering block, when the thickness of the second pad blocks is insufficient, the first pad blocks are arranged above the second pad blocks and combined into pad blocks with a proper height.

2. The adjustable bridge external prestressing tendon reinforcement turning block device according to claim 1, characterized in that: A pair of limiting plates distributed on the two sides of the adjusting screws are welded to the lower side of the bottom plate, a limiting groove is formed between the two limiting plates, and a pad block is arranged in the limiting groove and used for supporting the steering block, and notches are arranged at the two ends of the pad block and used for hooking the adjusting screws.

3. The adjustable bridge external prestressing tendon reinforcement turning block device according to claim 1, characterized in that: The bottom plate and the pad plate are connected through bolts, the anchoring screw rod is close to the bottom surface of the inner cavity of the hollow slab beam, and a screw rod pad plate is arranged between the anchoring screw rod and the bottom surface of the inner cavity of the hollow slab beam.

4. The adjustable bridge external prestressing tendon reinforcement turning block device according to claim 3, characterized in that: The steering block device further comprises an external protective cover which is connected to the bottom plate through bolts.

5. A method for reinforcing bridge external prestressed tendons using the adjustable bridge external prestressed tendon reinforcement deflection block device as claimed in claim 4, characterized in that: The application further discloses a method for installing the steering block device, which comprises the following steps: (1) determining the installation position and quantity of the steering block device on the bridge; (2) installing the anchoring device at the installation position of the steering block device, and the anchoring nut does not need to be tightened; (3) connecting and fastening the bottom plate and the pad plate of the steering block device through bolts, and clamping the steering block between the upper adjusting nut and the lower adjusting nut; (4) making the steering block be located at the highest position, fixing the prestressed steel bars at the two ends of the hollow slab beam through prestressed steel bar clamps, and making the prestressed steel bars pass below the corresponding steering blocks; (5) moving the steering block downward by adjusting the positions of the upper adjusting nut and the lower adjusting nut on the adjusting screw, tightening the lower adjusting nut when the steering block reaches the designed position, and arranging the pad blocks above the steering block to ensure the reliable support of the steering block; (6) fixing the protective cover on the bottom plate through bolts after the construction of the steering block is completed; (7) tightening the anchoring nut to reliably connect the pad plate and the hollow slab beam.

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