Anti-shearing and transverse reinforcing device for concrete hollow slab bridge

Abstract

The utility model relates to the technical field of bridge reinforcement, in particular to a shear resistance and transverse reinforcement device for a concrete hollow slab bridge, which comprises a bridge, the bridge is composed of a plurality of longitudinally arranged hollow slabs, a hinge joint is arranged between any two adjacent hollow slabs, and a pavement layer is paved on the bridge floor of the bridge. The fish-bellied supporting beams are horizontally and transversely arranged, and the upper surfaces of the fish-bellied supporting beams are attached to the lower surfaces of any four adjacent hollow slabs; the fish-bellied supporting beam comprises a main beam and two auxiliary beams which are transversely arranged, the two auxiliary beams are in front-back symmetry about the main beam and are integrally connected with the main beam, anchoring holes I which are through up and down are formed in the middle and the two ends of the main beam, and the positions of the three anchoring holes I correspond to the positions of the three hinge joints among the four corresponding hollow slabs one to one; the problems that an existing method for reinforcing and transforming the hollow slab bridge is long in construction period, large in traffic influence and weak in shear bearing capacity are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement, in particular to a shear resistance and transverse reinforcement device for concrete hollow slab bridges. Background Art

[0002] In highways and municipal roads, concrete hollow slab bridges are widely used due to their advantages of simple construction, high efficiency and low cost. They are generally constructed in an assembled manner. In order to enable the hollow slabs of the hollow slab bridge to jointly bear the live load of vehicles, hinge joints need to be cast between adjacent hollow slabs to make the hollow slab bridge a whole. The hinge joints generally have three forms: circular, diamond and funnel.

[0003] However, practice shows that due to design, construction and long-term service, especially under the effect of overload, hollow slab bridges gradually experience hinge joint damage and almost lose their shear resistance. This leads to the phenomenon of single-plate stress on the hollow slab under vehicle load. At this time, the bearing capacity of the concrete hollow slab bridge is significantly reduced. As a result, the overall lateral connection of the hollow slab bridge is weakened, the force transmission performance declines, and the bridge deck of the concrete hollow slab bridge has longitudinal cracks along the hinge joint direction. In severe cases, the hollow slab breaks, affecting the life of the hollow slab bridge. At the same time, with the occurrence of single-plate stress on the hollow slab, the hinge joint damage will be more serious, which may cause the hinge joint of the concrete hollow slab bridge to be completely destroyed and fall off, causing the concrete hollow slab bridge to have longitudinal through cracks along the hinge joint in the bridge deck pavement layer, making the stress of the concrete hollow slab bridge more and more unfavorable. Similarly, the damage of the hinge joint has caused many safety hazards to the durability and driving safety of the concrete hollow slab bridge structure.

[0004] At present, the existing methods for strengthening and reconstructing hollow slab bridges include increasing the cross-section and reinforcing the steel plate, but these reinforcement and reconstruction methods have the following problems: increasing the cross-section and reinforcing the steel plate will result in a long construction period and a great impact on traffic; the steel plate pasting method mainly uses adhesives and anchor bolts to vertically paste the steel plate transverse bridge to the bottom of the hollow slab bridge, relying on the steel plate to play the role of lateral connection, mainly improving the lateral connection function of the hollow slab bridge, and has limited improvement in shear bearing capacity.

[0005] Therefore, it is necessary to invent a shear resistance and transverse reinforcement device for concrete hollow slab bridges to solve the above problems. Utility Model Content

[0006] In order to solve the problems of long construction period, great impact on traffic and weak shear bearing capacity in the existing method for reinforcing and renovating hollow slab bridges, the utility model provides a shear and transverse reinforcement device for concrete hollow slab bridges.

[0007] The utility model is realized by adopting the following technical solutions:

[0008] A shear and transverse reinforcement device for a concrete hollow slab bridge comprises a bridge, the bridge is composed of a plurality of hollow slabs arranged longitudinally, a hinge joint is arranged between any two adjacent hollow slabs, a pavement layer is paved on the bridge deck, and the bridge also comprises a fish-belly support beam arranged horizontally and transversely, the upper surface of the fish-belly support beam is attached to the lower surface of any four adjacent hollow slabs;

[0009] The fish-belly support beam comprises a main beam and two sub-beams which are arranged transversely, the two sub-beams are symmetrical about the main beam in front and back and are connected to the main beam in one piece, the middle part and both ends of the main beam are provided with vertically penetrating anchor holes I, and the positions of the three anchor holes I correspond one to one with the positions of the three hinged seams between the corresponding four hollow plates, the middle part of each sub-beam is provided with vertically penetrating anchor holes II, and the two anchor holes II and the anchor hole I located in the middle part of the main beam are located on the same straight line, and each anchor hole I and anchor hole II is provided with an umbrella-shaped support frame;

[0010] Each umbrella-shaped support frame includes a vertical threaded anchor rod. The bottom end of each vertical threaded anchor rod is inserted into the corresponding anchor hole I or anchor hole II and is fixed to the fish-belly support beam through an anchor nut. The top end of each vertical threaded anchor rod is lower than the lower surface of the pavement layer. Each vertical threaded anchor rod is provided with a plurality of through holes distributed up and down. A longitudinal threaded anchor rod is inserted and fixed in each through hole. A limit piece is fixed at both ends of each longitudinal threaded anchor rod through an installation nut. Each limiting member includes a sleeve mounted on the corresponding longitudinal threaded anchor rod, and the outer side wall of each sleeve is integrally connected to the limiting plate, a right oblique support rod is welded to the left surface of the limiting plate located at the front end of each longitudinal threaded anchor rod, and the tail end of each right oblique support rod abuts against the right inner wall of the corresponding hinge joint, and a left oblique support rod is welded to the right surface of the limiting plate located at the rear end of each longitudinal threaded anchor rod, and the tail end of each left oblique support rod abuts against the left inner wall of the corresponding hinge joint.

[0011] Furthermore, the secondary beam is arc-shaped.

[0012] Furthermore, each hinged joint provided with an umbrella-shaped support frame is filled with ultra-high performance concrete.

[0013] Furthermore, an epoxy mortar leveling layer is provided between the upper surface of the fish-belly support beam and the lower surfaces of the corresponding four hollow slabs.

[0014] Furthermore, a steel pad is provided between each anchor nut and the fish-belly support beam.

[0015] Furthermore, the vertical threaded anchor rod, the longitudinal threaded anchor rod, the right oblique support rod, and the left oblique support rod are all high-strength screw rods.

[0016] Furthermore, the anchor nut is a high-strength nut.

[0017] Furthermore, the fish-belly support beam is made of steel section.

[0018] The utility model has a reasonable and reliable structural design, which effectively increases the shearing area of ​​the hollow slab bridge, strengthens the lateral connection between the hollow slab bridges, avoids the phenomenon of single hollow slab stress, and extends its service life; it does not require large-scale traffic closure and does not damage the bridge deck pavement; at the same time, the construction is simple and fast, which effectively improves the construction efficiency and shortens the construction period; the requirements for machinery and equipment are low, and there is no need to use large machinery; further, it has the advantages of small steel consumption and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a schematic diagram of the umbrella-shaped support frame in the utility model. Figure 1 .

[0021] Figure 3 It is a schematic diagram of the umbrella-shaped support frame in the utility model. Figure 2 .

[0022] Figure 4 It is a structural schematic diagram of the fish-belly type support beam in the utility model.

[0023] In the figure: 1-hollow slab, 2-paving layer, 3-main beam, 4-secondary beam, 5-anchor hole I, 6-anchor hole II, 7-vertical threaded anchor rod, 8-anchor nut, 9-longitudinal threaded anchor rod, 10-installing nut, 11-limiting piece, 12-right oblique support rod, 13-left oblique support rod, 14-ultra-high performance concrete, 15-epoxy mortar leveling layer. DETAILED DESCRIPTION

[0024] A shear and transverse reinforcement device for concrete hollow slab bridges, as shown in the attached Figure 1 ~Attached Figure 4 As shown, the bridge comprises a plurality of hollow plates 1 arranged longitudinally, a hinge joint is arranged between any two adjacent hollow plates 1, and a pavement layer 2 is paved on the bridge deck, characterized in that: it also comprises a fish-belly support beam arranged horizontally and transversely, and the upper surface of the fish-belly support beam is attached to the lower surface of any four adjacent hollow plates 1;

[0025] The fish-belly support beam comprises a main beam 3 and two auxiliary beams 4 which are arranged transversely. The two auxiliary beams 4 are symmetrical about the main beam 3 in the front and rear and are connected to the main beam 3 in one piece. The middle part and both ends of the main beam 3 are provided with vertically penetrating anchor holes Ⅰ5, and the positions of the three anchor holes Ⅰ5 correspond to the positions of the three hinged seams between the corresponding four hollow plates 1. The middle part of each auxiliary beam 4 is provided with vertically penetrating anchor holes Ⅱ6, and the two anchor holes Ⅱ6 and the anchor hole Ⅰ5 located in the middle part of the main beam 3 are located on the same straight line, and each anchor hole Ⅰ5 and anchor hole Ⅱ6 is provided with an umbrella-shaped support frame;

[0026] Each umbrella-shaped support frame includes a vertical threaded anchor rod 7. The bottom end of each vertical threaded anchor rod 7 is inserted into the corresponding anchor hole Ⅰ5 or anchor hole Ⅱ6 and is fixed to the fish-belly support beam through an anchor nut 8. The top end of each vertical threaded anchor rod 7 is lower than the lower surface of the pavement layer 2. Each vertical threaded anchor rod 7 is provided with a plurality of through holes distributed up and down. A longitudinal threaded anchor rod 9 is inserted and fixed in each through hole. A stopper 11 is fixed at both ends of each longitudinal threaded anchor rod 9 through an installation nut 10. Each limiting member 11 includes a sleeve mounted on the corresponding longitudinal threaded anchor rod 9, and the outer side wall of each sleeve is integrally connected to the limiting plate, a right oblique support rod 12 is welded to the left surface of the limiting plate at the front end of each longitudinal threaded anchor rod 9, and the tail end of each right oblique support rod 12 abuts against the right inner wall of the corresponding hinge joint, a left oblique support rod 13 is welded to the right surface of the limiting plate at the rear end of each longitudinal threaded anchor rod 9, and the tail end of each left oblique support rod 13 abuts against the left inner wall of the corresponding hinge joint.

[0027] The combined structural design of the umbrella-shaped support frame and the fish-belly support beam anchor in the utility model effectively increases the shearing area of ​​the hollow slab bridge, achieves the purpose of strengthening the lateral connection between the hollow slab bridges, avoids the phenomenon of single-plate stress on the hollow slab 1, prolongs its service life, and does not require large-scale traffic closure and does not damage the bridge deck pavement layer; at the same time, the umbrella-shaped support frame is simple and quick to use, and the angle adjustment and fixation of the limit member 11 can be achieved by screwing the installation nut 10, so that the right oblique support rod 12 and the left oblique support rod 13 are supported on the inner wall of the hinge joint, which not only effectively improves the construction efficiency and shortens the construction period, but also has strong flexibility and is suitable for a variety of working conditions; in addition, the umbrella-shaped support frame and the fish-belly support beam can be produced in a modular manner, which not only guarantees the quality, but also reduces the amount of steel used in construction and reduces the project cost.

[0028] As attached Figure 4 As shown, the auxiliary beam 4 is arc-shaped.

[0029] The structural design provides effective auxiliary support for the main beam 3 and increases the shear resistance area of ​​the hollow slab bridge, thereby enhancing the overall shear resistance of the hinge joint of the bridge.

[0030] As attached Figure 1 As shown, each hinged joint provided with an umbrella-shaped support frame is filled with ultra-high performance concrete 14.

[0031] Ultra-high performance concrete 14 not only has extremely high compressive and flexural strength, enabling the reinforced parts of the bridge to withstand large loads and deformations, but also has good workability and excellent durability, and can resist damage caused by chemical corrosion, temperature changes, freeze-thaw cycles and other factors, ensuring the construction quality of the hinged joints where the umbrella-shaped support frames are installed.

[0032] As attached Figure 1 As shown, an epoxy mortar leveling layer 15 is arranged between the upper surface of the herringbone support beam and the lower surfaces of the corresponding four hollow slabs 1 .

[0033] The epoxy mortar leveling layer 15 plays a leveling role, which is beneficial for the umbrella-shaped support frame to be anchored with the fish-belly support beam, so that the upper surface of the fish-belly support beam can be seamlessly fitted with the lower surfaces of the corresponding four hollow panels 1, thereby improving the effect of lateral support.

[0034] As attached Figure 1 As shown, a steel pad is provided between each anchor nut 8 and the fish-belly support beam.

[0035] The structural design of the steel pad can disperse the pressure at the anchor holes Ⅰ5 and Ⅱ6 of the fish-belly support beam, provide uniform support force for the fish-belly support beam, and ensure the stability and safety of the anchorage.

[0036] The vertical threaded anchor rod 7, the longitudinal threaded anchor rod 9, the right oblique support rod 12, and the left oblique support rod 13 are all high-strength screw rods.

[0037] The anchor nut 8 is a high-strength nut.

[0038] The fish-belly type support beam is made of section steel.

[0039] The present invention is further described in detail below through specific embodiments. It should be noted that the present invention is not limited to the following embodiments.

[0040] In this embodiment, the umbrella-shaped support frame is a three-stage umbrella-shaped support frame, that is, the vertical threaded anchor rod 7 is provided with three longitudinal threaded anchor rods 9 distributed up and down, and the lengths of the three longitudinal threaded anchor rods 9 are 15 cm, 10 cm and 6 cm respectively from top to bottom, and the diameter of each longitudinal threaded anchor rod 9 is 15 mm, and each longitudinal threaded anchor rod 9 is equipped with corresponding limit pieces 11, mounting nuts 10, left oblique support rods 13 and right oblique support rods 12; the diameter of the vertical threaded anchor rod 7 is 20 mm, and the length can be customized according to the actual situation on site; the thickness of the limit plate is 5 mm and the width is 40 mm; the length of the left oblique support rod 13 and the right oblique support rod 12 are both 15 cm and the diameter is 15 mm; the fish belly support beam is made of three steel sections of different lengths with a width of 20 cm and a thickness of 2 cm, and the overall shape of a fish belly after welding; the apertures of the anchor holes Ⅰ5 and Ⅱ6 are both 23 mm.

[0041] It should be noted that the lengths of the three longitudinal threaded anchor rods 9 of the three-level umbrella-shaped support frame described in this embodiment are 15 cm, 10 cm and 6 cm from top to bottom, respectively, in order to ensure that the corresponding three-level left oblique support rod 13 and right oblique support rod 12 can be staggered and folded.

[0042] The utility model is implemented by adopting the following steps during reinforcement construction:

[0043] Step 1: First, keep half of the bridge open to traffic, and implement temporary traffic control on the other half;

[0044] Step 2: chisel out an appropriate working space at the bottom of the bridge depending on the degree of damage to the hinge joint. The construction workers will insert the three-level umbrella-shaped support frames that are prefabricated in advance and meet the actual specifications into the hinge joints at the corresponding positions from the hinge joint damage position at the bottom of the bridge, ensuring that the top of the vertical threaded anchor rod 7 of each three-level umbrella-shaped support frame is perpendicular to the pavement layer 2, the bottom of the vertical threaded anchor rod 7 is vertically downward, and each vertical threaded anchor rod 7 is located at a suitable position in the left and right center of the corresponding hinge joint. Then, each mounting nut 10 of each three-level umbrella-shaped support frame is loosened so that each limiter 11 can rotate around its corresponding longitudinal threaded anchor rod 9;

[0045] Step 3: Open the right oblique support rod 12 of the first stage located at the top of the vertical threaded anchor rod 7 in each three-stage umbrella-shaped support frame to the right, so that its tail end abuts against the right inner wall of the corresponding hinge joint, and at the same time, open the left oblique support rod 13 of the same stage to the left, so that its tail end abuts against the left inner wall of the corresponding hinge joint, and tighten the two mounting nuts 10 of the first stage after adjusting the position to a suitable position, so that the right oblique support rod 12 and the left oblique support rod 13 of the first stage of each three-stage umbrella-shaped support frame can be fixed;

[0046] Step 4: Repeat step 3 to sequentially install and fix the second-stage right oblique support rod 12 and the left oblique support rod 13 located in the middle and upper part of the vertical threaded anchor rod 7 and the third-stage right oblique support rod 12 and the left oblique support rod 13 located in the middle part of the vertical threaded anchor rod 7 in each three-stage umbrella-shaped support frame. After each three-stage umbrella-shaped support frame is firmly supported in the corresponding hinge joint, the construction workers pour ultra-high performance concrete 14 into each hinge joint for filling;

[0047] Step 5: After the ultra-high performance concrete 14 inside each hinge joint solidifies, use epoxy mortar to level the area on the lower surface of the hollow slab 1 where the fish-belly support beam needs to be set. When the thickness to be leveled is greater than 1 cm, coarse sand epoxy mortar needs to be used for leveling;

[0048] Step six: Install the fish-belly support beam, align the anchor holes Ⅰ5 and Ⅱ6 with the vertical threaded anchor rods 7 at the corresponding positions in sequence, and anchor them through the anchor nuts 8. After anchoring, the entire fish-belly support beam is stretched to a horizontal transverse state, thereby completing the installation of the device; it overcomes the problems of long construction period, great impact on traffic, and weak shear bearing capacity in the existing methods for reinforcing and renovating hollow slab bridges.

[0049] During the specific implementation process, the right oblique support rod 12 and the left oblique support rod 13 are both welded and fixed to the limiter 11, and the maximum width after welding is no greater than the diameter of the vertical threaded anchor rod 7; the fish belly support beam and the umbrella-shaped support frame are both treated with anti-corrosion.

[0050] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shear and transverse reinforcement device for a concrete hollow slab bridge, comprising a bridge, the bridge being composed of a plurality of hollow slabs (1) arranged longitudinally, a hinged joint being arranged between any two adjacent hollow slabs (1), and a pavement layer (2) being paved on the bridge deck, characterized in that: It also includes a fish-belly support beam arranged horizontally and transversely, wherein the upper surface of the fish-belly support beam is attached to the lower surface of any four adjacent hollow plates (1); The fish-belly support beam comprises a main beam (3) and two auxiliary beams (4) which are arranged transversely, the two auxiliary beams (4) are symmetrical with respect to the main beam (3) in front and back and are connected to the main beam (3) in one piece, the middle part and both ends of the main beam (3) are provided with vertically penetrating anchor holes I (5), and the positions of the three anchor holes I (5) correspond one to one with the positions of the three hinged seams between the corresponding four hollow plates (1), the middle part of each auxiliary beam (4) is provided with vertically penetrating anchor holes II (6), and the two anchor holes II (6) and the anchor hole I (5) located in the middle part of the main beam (3) are located on the same straight line, and each anchor hole I (5) and anchor hole II (6) are provided with an umbrella-shaped support frame; Each umbrella-shaped support frame comprises a vertical threaded anchor rod (7), the bottom end of each vertical threaded anchor rod (7) is inserted into the corresponding anchor hole I (5) or anchor hole II (6) and is fixed to the fish-belly support beam through an anchor nut (8), the top end of each vertical threaded anchor rod (7) is lower than the lower surface of the pavement layer (2), each vertical threaded anchor rod (7) is provided with a plurality of through holes distributed along the upper and lower sides, each through hole is inserted and fixed with a longitudinal threaded anchor rod (9), and each longitudinal threaded anchor rod (9) is fixed with a stopper (1) at both ends through a mounting nut (10). 1), each limiting member (11) comprises a sleeve sleeved on the corresponding longitudinal threaded anchor rod (9), and the outer side wall of each sleeve is integrally connected to the limiting plate, a right oblique support rod (12) is welded to the left surface of the limiting plate at the front end of each longitudinal threaded anchor rod (9), and the tail end of each right oblique support rod (12) abuts against the right inner wall of the corresponding hinge joint, and a left oblique support rod (13) is welded to the right surface of the limiting plate at the rear end of each longitudinal threaded anchor rod (9), and the tail end of each left oblique support rod (13) abuts against the left inner wall of the corresponding hinge joint.

2. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: The secondary beam (4) is arc-shaped.

3. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: Each hinged joint provided with an umbrella-shaped support frame is filled with ultra-high performance concrete (14).

4. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: An epoxy mortar leveling layer (15) is provided between the upper surface of the fish-bellied support beam and the lower surfaces of the corresponding four hollow slabs (1).

5. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: A steel pad is provided between each anchor nut (8) and the fish-belly type support beam.

6. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: The vertical threaded anchor rod (7), the longitudinal threaded anchor rod (9), the right oblique support rod (12), and the left oblique support rod (13) are all high-strength threaded rods.

7. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: The anchor nut (8) is a high-strength nut.

8. The shear and transverse reinforcement device for a concrete hollow slab bridge according to claim 1, characterized in that: The fish-belly type support beam is made of section steel.

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