Hollow slab bridge reinforcing structure and hollow slab bridge reinforcing method

Abstract

The application provides a hollow slab bridge reinforcing structure and a hollow slab bridge reinforcing method. A plurality of upper steel belts are laid on the top surface of the bridge in the longitudinal direction of the bridge at intervals. A plurality of lower groove-shaped steel belts are laid on the bottom surface of the bridge in the longitudinal direction of the bridge at intervals, and the two ends of the lower groove-shaped steel belts at the positions of the two sides of the bridge are respectively detachably connected to the lower parts of the opposite two ends of the bridge. A plurality of pull rods are inserted into the hinge joints on the bridge in the longitudinal direction of the bridge at intervals, and the top ends are connected to the corresponding upper steel belts and the bottom ends are connected to the corresponding lower steel belts. The hinge joints, the bottom of the bridge and the grooves of the two side surfaces of the bridge are all poured with ultra-high performance concrete. The reinforcing method can effectively enhance the bending shear resistance of the hinge joints, the structural integrity and the rigidity, improve the overall bearing capacity of the hollow slab bridge with diseases, effectively prevent the corrosion of the steel belt, prolong the service life of the steel belt, and is convenient to construct and has strong operability.

Description

Technical Field

[0001] This application relates to the field of construction, and in particular to a hollow slab bridge reinforcement structure and a hollow slab bridge reinforcement method. Background Technology

[0002] Due to factors such as a significant increase in traffic volume, vehicle overloading, natural aging of materials, and environmental erosion, the hinge joints of most hollow slab bridges that have been in operation for many years are severely damaged, and some even have a state of single-slab stress, posing many safety hazards.

[0003] Currently, some reinforcement methods can be roughly divided into several categories, such as hinge joint reinforcement, bridge deck reinforcement, transverse external prestressing reinforcement, and beam bottom steel plate reinforcement. Although the first two methods can improve the stress state of the structure to a certain extent, they do not change the stress form of the hinge joint, which only transmits shear force, and the reinforcement effect is not obvious. External prestressing reinforcement has high construction technical difficulty, high prestressing maintenance cost, and certain safety risks. Beam bottom steel plate reinforcement has problems such as easy corrosion of steel plates and unsightly appearance. Summary of the Invention

[0004] One of the purposes of this application is to provide a hollow slab bridge reinforcement structure and a hollow slab bridge reinforcement method to solve the problem of poor reinforcement effect of existing hollow slab bridge hinge joints.

[0005] The technical solution of this application is:

[0006] A hollow slab bridge reinforcement structure includes multiple upper steel strips, multiple channel-shaped lower steel strips, and multiple tie rods. The upper steel strips are laid at intervals along the longitudinal direction of the bridge on the top surface of the bridge. The channel-shaped lower steel strips are laid at intervals along the longitudinal direction of the bridge on the bottom surface of the bridge, and the two ends of the channel-shaped lower steel strips located on both sides of the bridge are detachably connected to the lower part of the opposite sides of the bridge. The tie rods are inserted at intervals along the longitudinal direction of the bridge into the hinge joints on the bridge, and the top ends are connected to the corresponding upper steel strips, and the bottom ends are connected to the corresponding lower steel strips. Ultra-high performance concrete is poured into the hinge joints, the bottom surface of the bridge, and the grooves on both sides of the bridge.

[0007] As one technical solution of this application, the top end of the pull rod is threadedly connected to the corresponding upper steel strip by a nut, and the bottom end is threadedly connected to the corresponding grooved lower steel strip by a nut.

[0008] As one technical solution of this application, a first connecting hole is provided on the upper steel strip at a position corresponding to the hinge, and is threaded to the top end of the pull rod through the first connecting hole; a second connecting hole is provided on the grooved lower steel strip at a position corresponding to the hinge, and is threaded to the bottom end of the pull rod through the second connecting hole.

[0009] As one technical solution of this application, the bottom surface of the bridge is provided with a plurality of first grooves spaced apart along the longitudinal direction, the width of the first groove being greater than the width of the corresponding trough-shaped lower steel strip; the trough-shaped lower steel strip is bonded to the first groove by an adhesive.

[0010] As one technical solution of this application, a plurality of second grooves are provided on the lower part of both sides of the bridge, the width of the second grooves being greater than the width of the corresponding trough-shaped lower steel strip; the trough-shaped lower steel strip is installed in the second grooves by expansion bolts and adhesive.

[0011] As one technical solution of this application, the upper steel strip and the lower trough-shaped steel strip have the same width, and both are 50cm to 100cm wide.

[0012] As one technical solution of this application, the tie rod includes finely rolled threaded steel bars.

[0013] A method for reinforcing hollow slab bridges, employing the hollow slab bridge reinforcement structure described above, includes the following steps:

[0014] Step 1: Measure the actual dimensions of the damaged bridge and determine the width, length, thickness, spacing, and quantity of the upper steel strip and the lower trough steel strip used for reinforcement. Determine the length of the tie rod based on the beam height of the bridge. Fabricate the upper steel strip, the lower trough steel strip, and the tie rod respectively.

[0015] Step 2: Mill the bridge deck pavement and cast-in-place concrete layers at the location of the defects on the bridge. The milling width along the longitudinal direction of the bridge is 1.5 to 2 times the width of the upper steel strip and 1.5 to 2 times the width of the lower trough steel strip. Mill along the transverse direction to the crash barrier. Remove the original concrete structure at the hinge joint within the reinforcement area. The removal width along the longitudinal direction of the bridge is 1.5 to 2 times the width of the upper steel strip and 1.5 to 2 times the width of the lower trough steel strip.

[0016] Step 3: Remove the concrete layer from the bottom surface of the bridge to form a first groove, and remove the concrete layer from the lower part of both sides of the bridge to form a second groove; drill holes on the side of the second groove, and the drilling positions correspond to the opening positions on the lower steel strip of the groove.

[0017] Step 4: Apply adhesive to the first groove and the second groove respectively, install the grooved lower steel strip in the first groove and the second groove respectively, and tighten the expansion bolt in the second groove; pass the tie rod through the hinge from below, and tighten the nut at the bottom of the tie rod to fix the tie rod; apply adhesive to the corresponding position on the top surface of the bridge and install the upper steel strip, and tighten the nut at the top of the tie rod.

[0018] Step 5: Pour ultra-high performance concrete into the hinge joint through the gaps on both sides of the upper steel strip on the top surface of the bridge. After pouring, tighten the nuts at the top and bottom of the tie rod so that the upper steel strip and the grooved lower steel strip are tightly attached to the beam of the bridge.

[0019] Step six: Re-pour ultra-high performance concrete at the second groove at the bottom of the bridge, and re-pour the cast-in-place concrete layer and the bridge deck pavement layer.

[0020] The beneficial effects of this application are:

[0021] The hollow slab bridge reinforcement structure and method disclosed in this application can effectively improve the overall load-bearing capacity of the damaged hollow slab bridge. At the same time, both the upper steel strip and the trough-shaped lower steel strip are covered with ultra-high performance concrete, which can effectively prevent the steel strip from rusting and has a good aesthetic appearance, thus extending its service life. In addition, the reinforcement method causes less damage to the original beam, is convenient to construct, and has strong operability. It can be widely used for the reinforcement of hollow slab bridges with different spans and widths. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a hollow slab bridge reinforcement structure provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the first angle of the hollow slab bridge reinforcement structure provided in the embodiments of this application;

[0025] Figure 3 This is a second-angle schematic diagram of the hollow slab bridge reinforcement structure provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of expansion bolt anchorage provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram of a pull rod provided in an embodiment of this application.

[0028] Icons: 1-Upper steel strip; 2-Channel-shaped lower steel strip; 3-Tie rod; 4-Joint concrete; 5-Bottom layer concrete; 6-Middle beam; 7-Side beam; 8-Expansion bolt; 9-Cast-in concrete layer; 10-Bridge deck pavement layer. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example:

[0037] Please refer to Figure 1 (Refer to) Figures 2 to 5 This application provides a hollow slab bridge reinforcement structure, which mainly includes multiple upper steel strips 1, multiple channel-shaped lower steel strips 2, multiple tie rods 3, joint concrete 4, and bottom concrete 5. The hollow slab bridge consists of multiple central beams 6 to be reinforced and two side beams 7. Multiple upper steel strips 1 are laid at intervals along the longitudinal direction of the bridge on its top surface. Simultaneously, multiple channel-shaped lower steel strips 2 are laid at intervals along the longitudinal direction of the bridge on its bottom surface, with the ends of the channel-shaped lower steel strips 2 located at both ends of the bridge detachably connected to the lower sides of the opposite ends of the bridge. Furthermore, multiple tie rods 3 are inserted at intervals along the longitudinal direction of the bridge into the hinge joints, with their top ends connected to the corresponding upper steel strips 1 and their bottom ends connected to the corresponding lower steel strips. The joint concrete 4 is poured into the hinge joints. The bottom concrete 5 is poured onto the bottom surface of the bridge, the lower sides of both ends of the bridge, and the channel-shaped lower steel strips 2. The upper steel strip 1 and the trough-shaped lower steel strip 2 are tightly anchored to the middle beam 6 and the side beam 7 of the hollow slab bridge through the tie rod 3 and the expansion bolt 8 on the side, which can effectively enhance the overall rigidity of the beam and improve the stress state of the bridge.

[0038] It should be noted that the top end of the pull rod 3 is threadedly connected to the corresponding upper steel strip 1 via a nut, and the bottom end is threadedly connected to the corresponding grooved lower steel strip 2 via a nut. Simultaneously, a first connecting hole is provided on the upper steel strip 1 at a position corresponding to the hinge joint, and the upper end is threadedly connected to the top end of the pull rod 3 through the first connecting hole; a second connecting hole is provided on the grooved lower steel strip 2 at a position corresponding to the hinge joint, and the lower end is threadedly connected to the bottom end of the pull rod 3 through the second connecting hole.

[0039] Furthermore, for the middle beam 6 and side beam 7 to be reinforced, a certain thickness of concrete needs to be removed from the bottom and sides of the beams at the fixing positions of the trough-shaped lower steel strip 2 to form a first groove and a second groove, respectively. The width of the first groove and the second groove along the longitudinal direction of the bridge is slightly larger than the width of the trough-shaped lower steel strip 2, and the thickness removed must be greater than the sum of the thickness of the trough-shaped lower steel strip 2 used for reinforcement and the thickness of the expansion bolt 8 nut, to ensure that all reinforcement components are completely covered by concrete after the ultra-high performance concrete is poured. Therefore, multiple first grooves are spaced apart along the longitudinal direction on the bottom surface of the bridge, and the width of the first groove is greater than the width of the corresponding trough-shaped lower steel strip 2; the trough-shaped lower steel strip 2 is bonded to the first groove with adhesive. Multiple second grooves are formed on the lower side of the bridge, and the width of the second groove is greater than the width of the corresponding trough-shaped lower steel strip 2; the trough-shaped lower steel strip 2 is installed in the second groove with expansion bolt 8 and adhesive.

[0040] It should be noted that the upper steel strip 1 and the trough-shaped lower steel strip 2 have the same width, both ranging from 50cm to 100cm. Furthermore, the wider the bridge, the wider the width of the upper steel strip 1 and the trough-shaped lower steel strip 2. The spacing between the upper steel strip 1 and the trough-shaped lower steel strip 2 along the longitudinal direction of the bridge is generally 2-3m, and both are determined according to the degree of bridge damage; in areas with severe damage, the spacing can be appropriately increased. The upper steel strip 1 and the trough-shaped lower steel strip 2 need to be pre-treated with sandblasting for rust prevention, increasing surface roughness to facilitate better bonding with concrete, adhesives, and other materials. The bolts used to fix the lower steel strips on the side of the beam are expansion bolts 8, arranged in two rows along the longitudinal direction of the bridge and in 2-3 rows along the vertical direction.

[0041] Furthermore, both the joint concrete 4 and the bottom layer concrete 5 are ultra-high performance concrete. Additionally, the tie rods 3 can be made of finely rolled threaded steel bars. At each reinforcement point, the tie rods 3 are arranged in two rows along the longitudinal direction of the bridge, with the number along the transverse direction matching the number of hinge joints. The tie rods 3 ensure that the upper steel strip 1 and the channel-shaped lower steel strip 2 are tightly attached to the beam. Combined with the newly poured ultra-high performance concrete in the hinge joints, this effectively enhances the bending and shear resistance, structural integrity, and stiffness at the hinge joints, improving the overall load-bearing capacity of the damaged hollow slab bridge. Simultaneously, the upper steel strip 1 and the channel-shaped lower steel strip 2 are covered by concrete, effectively preventing corrosion and providing a better aesthetic appearance, thus extending their service life. Moreover, this reinforcement method causes minimal damage to the original beam structure, is convenient to construct, and highly operable, making it widely applicable for the reinforcement of hollow slab bridges of different spans and widths.

[0042] In addition, this embodiment also provides a method for reinforcing hollow slab bridges, which uses the above-mentioned hollow slab bridge reinforcement structure for reinforcement; it mainly includes the following steps:

[0043] Step 1: Measure the actual dimensions of the damaged bridge, such as the beam height, beam bottom width, and bridge span. Based on the measured beam bottom width, span, and damage condition, determine the width, length, thickness, distribution spacing, and quantity of the upper steel strip 1 and the channel-shaped lower steel strip 2 used for reinforcement. Determine the length of the tie rod 3 based on the beam height. Then, customize the upper steel strip 1, channel-shaped lower steel strip 2, and tie rod 3 used for reinforcement at the factory according to the dimensions determined by the reinforcement plan.

[0044] Step 2: Mill the bridge deck pavement layer 10 and cast-in-place concrete layer 9 at the location of the defect on the bridge. Depending on the severity of the defect, it may be necessary to mill the entire bridge. If partial milling is required, the milling width along the longitudinal direction of the bridge should be 1.5 to 2 times the width of the upper steel strip 1 and 1.5 to 2 times the width of the lower trough steel strip 2, and mill along the transverse direction to the crash barrier. Remove the original concrete structure at the hinge joint within the reinforcement area, and the removal width along the longitudinal direction of the bridge should be 1.5 to 2 times the width of the upper steel strip 1 and 1.5 to 2 times the width of the lower trough steel strip 2.

[0045] Step 3: Remove a certain thickness of concrete layer at the corresponding position on the bottom of the bridge to form the first groove. The longitudinal width of the first groove is slightly larger than the width of the lower steel strip 2. The thickness removed should be greater than the sum of the thickness of the lower steel strip 2 used for reinforcement and the thickness of the nuts of the expansion bolts 8 (or the nuts of the tie rods 3) to ensure that all reinforcement components are completely covered by concrete after the ultra-high performance concrete is poured. Remove a certain thickness of concrete layer at the corresponding position on the lower side of the bridge to form the second groove. Drill holes on the side of the second groove, and the drilling positions correspond to the opening positions on the lower steel strip 2.

[0046] Step 4: Apply adhesive to the first and second grooves respectively, install the grooved lower steel strip 2 in the first and second grooves respectively, tighten the expansion bolt 8 in the second groove and set up temporary support at the bottom of the beam; pass the tie rod 3 through the hinge from below, tighten the nut at the bottom of the tie rod 3 to fix the tie rod 3; apply adhesive to the corresponding position on the top surface of the bridge and install the steel strip 1, tighten the nut at the top of the tie rod 3, and tighten the upper and lower nuts of the tie rod 3 only until the tie rod 3 just begins to bear force;

[0047] Step 5: Pour ultra-high performance concrete into the hinge joint through the gaps on both sides of the upper steel strip 1 on the top surface of the bridge. After pouring, tighten the nuts at the top and bottom of the tie rod 3 so that the upper steel strip 1 and the trough-shaped lower steel strip 2 are tightly attached to the bridge beam.

[0048] Step 6: Re-pour ultra-high performance concrete at the second groove at the bottom of the bridge, and re-pour the cast-in-place concrete layer 9 and the bridge deck pavement layer 10. After the concrete curing is completed, the bridge can be reopened to traffic.

[0049] In summary, the hollow slab bridge reinforcement structure and method of this application can effectively improve the overall load-bearing capacity of the damaged hollow slab bridge. At the same time, both the upper steel strip 1 and the trough-shaped lower steel strip 2 are covered by ultra-high performance concrete, which can effectively prevent the steel strip from rusting and has good aesthetics, thus extending its service life. In addition, the reinforcement method causes less damage to the original beam, is easy to construct, and has strong operability. It can be widely used for the reinforcement of hollow slab bridges with different spans and widths.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hollow slab bridge reinforcement structure, characterized in that, The bridge includes multiple upper steel strips, multiple channel-shaped lower steel strips, and multiple tie rods. The upper steel strips are laid at intervals along the longitudinal direction of the bridge on its top surface. The channel-shaped lower steel strips are laid at intervals along the longitudinal direction of the bridge on its bottom surface, with the ends of the channel-shaped lower steel strips located on both sides of the bridge detachably connected to the lower parts of opposite sides of the bridge. The tie rods are inserted at intervals along the longitudinal direction of the bridge into the hinge joints, with their top ends connected to the corresponding upper steel strips and their bottom ends connected to the corresponding lower steel strips. Ultra-high performance concrete is poured into the hinge joints, the bottom surface of the bridge, and the grooves on both sides of the bridge. The top ends of the tie rods are threadedly connected to the corresponding upper steel strips via nuts, and their bottom ends are threadedly connected to the corresponding channel-shaped lower steel strips via nuts. A first connecting hole is provided at the position corresponding to the hinge joint on the upper steel strip, and the upper steel strip is threaded to the top end of the tie rod through the first connecting hole; a second connecting hole is provided at the position corresponding to the hinge joint on the lower steel strip, and the upper steel strip is threaded to the bottom end of the tie rod through the second connecting hole; multiple first grooves are provided longitudinally on the bottom surface of the bridge, the width of the first groove being greater than the width of the corresponding lower steel strip; the lower steel strip is bonded to the first groove with adhesive; multiple second grooves are provided on the lower part of both sides of the bridge, the width of the second groove being greater than the width of the corresponding lower steel strip; the lower steel strip is installed in the second groove with expansion bolts and adhesive; the upper steel strip and the lower steel strip have the same width, and the width of each is 50cm~100cm.

2. The hollow slab bridge reinforcement structure according to claim 1, characterized in that, The tie rod comprises finely rolled threaded steel bars.

3. A method for reinforcing hollow slab bridges, characterized in that, The hollow slab bridge reinforcement structure according to any one of claims 1 to 2 is used for reinforcement, including the following steps: Step 1: Measure the actual dimensions of the damaged bridge and determine the width, length, thickness, spacing, and quantity of the upper steel strip and the lower trough steel strip used for reinforcement. Determine the length of the tie rod based on the beam height of the bridge. Fabricate the upper steel strip, the lower trough steel strip, and the tie rod respectively. Step 2: Mill the bridge deck pavement and cast-in-place concrete layers at the location of the defects on the bridge. The milling width along the longitudinal direction of the bridge is 1.5 to 2 times the width of the upper steel strip and 1.5 to 2 times the width of the lower trough steel strip. Mill along the transverse direction to the crash barrier. Remove the original concrete structure at the hinge joint within the reinforcement area. The removal width along the longitudinal direction of the bridge is 1.5 to 2 times the width of the upper steel strip and 1.5 to 2 times the width of the lower trough steel strip. Step 3: Remove the concrete layer from the bottom surface of the bridge to form a first groove, and remove the concrete layer from the lower part of both sides of the bridge to form a second groove; drill holes on the side of the second groove, and the drilling positions correspond to the opening positions on the lower steel strip of the groove. Step 4: Apply adhesive to the first groove and the second groove respectively, install the grooved lower steel strip in the first groove and the second groove respectively, and tighten the expansion bolt in the second groove; pass the tie rod through the hinge from below, and tighten the nut at the bottom of the tie rod to fix the tie rod; apply adhesive to the corresponding position on the top surface of the bridge and install the upper steel strip, and tighten the nut at the top of the tie rod. Step 5: Pour ultra-high performance concrete into the hinge joint through the gaps on both sides of the upper steel strip on the top surface of the bridge. After pouring, tighten the nuts at the top and bottom of the tie rod so that the upper steel strip and the grooved lower steel strip are tightly attached to the beam of the bridge. Step six: Re-pour ultra-high performance concrete at the second groove at the bottom of the bridge, and re-pour the cast-in-place concrete layer and the bridge deck pavement layer.

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