Maintenance and reinforcement device for hinge joint of hollow slab bridge

Abstract

A maintenance and reinforcement device for hinge joints of hollow slab bridges comprises more than two self-locking anchor rods and a steel cross beam connected with the self-locking anchor rods. The self-locking anchor rod comprises a rod body and an expandable hinge joint clamping connector located at the top of the rod body, the rod body extends in the vertical direction and comprises a hinge joint penetrating part and a connecting part located at the bottom, the steel cross beam extends in the horizontal direction and is connected with the connecting part, and the steel cross beam comprises a bottom supporting face used for supporting the bottom face of the hollow slab. According to the hollow slab bridge hinge joint reinforcing device, interference to normal traffic operation in the hollow slab bridge hinge joint maintaining and reinforcing process can be remarkably reduced, construction and maintenance cost is reduced, and traffic smoothness and public safety are guaranteed to the maximum extent.

Description

Technical Field

[0001] This utility model relates to the field of bridge reinforcement and renovation, specifically to the structural design for the repair and reinforcement of hinge joints in hollow slab bridges. Background Technology

[0002] Hollow slab bridges are a widely used bridge structure in engineering, renowned for their economy, ease of construction, and good load-bearing capacity. Their basic structural unit is the hollow slab. Reams exist between these slabs, playing a crucial role in the bridge structure. These reams not only effectively transfer loads, ensuring that all slabs share the load under vehicle traffic and other loads, thus improving the overall load-bearing capacity and structural stability of the bridge, but also coordinate the deformation between the slabs, adapting to the deformation requirements of the bridge under temperature changes, concrete shrinkage and creep, and preventing excessive stress concentration due to inconsistent deformation, thereby extending the bridge's service life. However, due to the long-term effects of vehicle loads and the expansion and contraction caused by temperature changes, these reams are prone to cracking and detachment. Once the reams malfunction, the load-bearing capacity of the bridge's local or even overall structure decreases, seriously affecting the bridge's safety and service life.

[0003] To address the aforementioned issues, Chinese patent document CN102635060B discloses a concrete hollow slab bridge reinforced with transverse steel beams. This bridge includes a deck beam composed of multiple hollow slab beams arranged side-by-side, and at least one stiffening beam located on the bottom surface of the deck beam for transverse reinforcement, enabling the transverse transmission of loads on each hollow slab beam. The upper flange of the stiffening beam is fixed to the hollow slab beam via connecting rod assemblies pre-embedded in each hinge joint. The connecting rod assembly includes a threaded rod with its tail pre-embedded in the hinge joint and barbs fixedly disposed at the tail of the threaded rod. Reinforcement with transverse steel beams avoids stress on individual slabs, extends the bridge's service life, and improves the overall structural integrity of the bridge.

[0004] While existing technologies and other traditional reinforcement methods, such as joint grouting, joint reconstruction, and thickening of bridge deck pavement, can alleviate problems like joint cracking and detachment in hollow slab bridges to some extent, these methods significantly impact normal traffic operations. When bridge joints require reinforcement and repair, it typically necessitates partial or complete bridge closure for a period, followed by construction on the bridge deck and a series of complex operations, including milling the pavement. This type of construction is not only time-consuming but also severely disrupts daily traffic, increasing travel time and costs. Utility Model Content

[0005] In view of the aforementioned problems in the existing technology, this utility model proposes a repair and reinforcement device for the hinge joints of hollow slab bridges. This device supports construction under the bridge and, compared with traditional repair and reinforcement methods, can significantly reduce interference with normal traffic operation while shortening the construction period. This not only reduces construction and maintenance costs but also maximizes traffic flow and public safety.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A repair and reinforcement device for the hinge joint of a hollow slab bridge includes two or more self-locking anchor rods and a steel crossbeam connected to the self-locking anchor rods; the self-locking anchor rod includes a rod body and an expandable hinge joint clamping joint located at the top of the rod body, the rod body extends vertically and includes a hinge joint through portion and a connecting portion located at the bottom, the steel crossbeam extends horizontally and is connected to the connecting portion, and the steel crossbeam includes a bottom support surface for supporting the bottom surface of the hollow slab.

[0008] Self-locking anchors are an anchoring technology used for building renovation and reinforcement. They provide instantaneous anchoring force and ensure reliability by creating a mechanical interlocking force through the opening of the anchor head at the bottom of the hole. During construction, the center position of the hinge joint between multiple hollow slabs on the same cross-section of the bridge is first located. Then, a straight hole is drilled upwards to the design depth at the corresponding position at the bottom of the hollow slab using a geological drilling rig or down-the-hole drill, and the hole is enlarged at the bottom using a reamer. Subsequently, a high-pressure grouting machine is used to inject water to clean the hole until clear water emerges from the top, ensuring the hole wall is clean. Next, the pre-assembled self-locking anchor is inserted into the bottom of the hole from bottom to top, and pressure is applied to the tail of the anchor to open the hinge joint at the top along the enlarged hole wall, ensuring the self-locking anchor is firmly locked in the hinge joint. The anchor body extends vertically, including the hinge joint penetration part and connecting part located in the hinge joint. A steel crossbeam extends horizontally and is fixedly sleeved on the connecting part, tightly fitting the bottom of the supporting hollow slab. On the same cross section, multiple self-locking anchors fixedly connected in the hinge joint serve as connecting media, enabling the steel beam and the hollow slab to form an integral structure, thereby enhancing the integrity and stability of the bridge.

[0009] This invention ensures the hollow slabs are securely locked within the hinge joint by inserting multiple self-locking anchors from bottom to top into the joint. These anchors, acting as connecting intermediaries, penetrate and are fixedly connected to the steel crossbeam, allowing the crossbeam to tightly support the bottom surface of the hollow slab. This creates a unified structure between the steel crossbeam and the hollow slab, further enhancing the bridge's load-bearing capacity through lateral force transmission and overall load-bearing. Compared to conventional hollow slab bridge hinge joint repair and reinforcement devices, this invention requires only construction under the bridge during the repair and reinforcement process, minimizing traffic disruption and reducing inconvenience caused by prolonged road closures or traffic restrictions, while significantly reducing construction and maintenance costs.

[0010] Preferably, the self-locking anchor also includes fasteners for connecting and fixing the steel beam to the connecting portion.

[0011] During construction, the steel beams are first fitted onto the connecting parts. Then, fasteners (such as high-strength bolts or self-locking clips) are gradually tightened until the bottom surface of the support is completely flush with the bottom of the hollow slab. This process not only ensures a tight connection between the steel beams and the hollow slab but also, through the synergistic effect of the self-locking anchors, forms a stable overall structure. This effectively withstands various loads and stresses during construction and use, ensuring the safety and durability of the structure.

[0012] Preferably, the steel beam is a channel steel with a through hole that matches the connecting part. Structural adhesive is applied between the inner wall of the through hole and the connecting part, and structural adhesive is applied to the bottom surface.

[0013] Channel steel, due to its high bending stiffness and load-bearing capacity, can stably withstand the loads of bridges. Its light weight facilitates handling and installation, helping to reduce the bridge's self-weight. Therefore, using channel steel as the steel crossbeam, with through holes on its upper and lower flanges matching the connection points, combined with the use of structural adhesive, can significantly improve the connection strength and stability between the steel crossbeam and the hollow slab. The adhesive's bonding effect not only enhances the durability and shear resistance of the connection but also effectively improves the overall structural performance of the bridge, extending its service life.

[0014] Preferably, grouting material is provided in the peripheral gaps of the hinge joint and the hinge through part.

[0015] Grouting around the hinge joint and the area where the hinge passes through can fill the gaps between the self-locking anchor and the hole wall, forming a continuous and dense cementitious body. This cementitious body not only significantly enhances the bond between the self-locking anchor and the hollow slab, ensuring a firm connection, but also provides additional anchoring force through frictional resistance, thereby effectively improving the anchoring performance of the self-locking anchor.

[0016] Preferably, the steel beam comprises multiple individual beams.

[0017] The steel crossbeams are assembled from multiple individual beams using methods such as welding and bolting. This design makes installation more flexible and convenient, significantly shortening on-site construction time and reducing traffic disruption. Furthermore, the modular assembly method facilitates transportation and assembly, reducing on-site operational difficulty, and allows for length adjustments to meet actual needs, improving project adaptability and efficiency. Finally, if a section is damaged, only the affected unit needs to be replaced, eliminating the need for complete dismantling and effectively reducing maintenance costs.

[0018] Preferably, the outer surface of the shaft includes roughened protrusions.

[0019] Grooved protrusions are formed on the surface of the pole by machining threads or sandblasting, which increases the contact area with the grouting material. Compared with smooth poles, this can significantly improve the bonding strength between the pole and the surrounding materials, thereby enhancing the stability and durability of the structure.

[0020] Preferably, expansion bolts are provided at both ends of the steel beam.

[0021] In the maintenance and reinforcement of hinge joints in hollow slab bridges, the lack of self-locking anchors between the hollow slab ends and the steel beams may lead to insufficient bonding between the support surface and the hollow slab. Expansion bolts, with their high anchoring force and stability, can significantly enhance the connection strength between the steel beams and the hollow slabs, ensuring the overall stability of the structure.

[0022] Preferably, the bottom of the self-locking anchor is detachably connected to a limiting sleeve, which includes an insertion port for the connecting part to extend into and a limiting contact surface for contacting the bottom surface of the hollow plate.

[0023] Before installing the self-locking anchor bolt, first insert its connecting part into the limiting sleeve. Then, insert the self-locking anchor bolt into the hinge joint from bottom to top. When the limiting contact surface of the limiting sleeve abuts against the bottom of the hollow plate, it can be confirmed that the self-locking anchor bolt has reached the preset installation position. At this time, the user can remove the limiting sleeve and apply pressure to the tail of the self-locking anchor bolt to open the hinge joint at its top along the wall of the enlarged hole. This limiting sleeve effectively avoids the problem of premature opening of the hinge joint due to improper installation or operational errors, ensuring the accuracy and reliability of the installation.

[0024] In summary, this utility model has the following beneficial effects:

[0025] 1. By inserting self-locking anchor rods into the hinge joints between hollow slabs and tightly fitting them with steel crossbeams, the problems of hinge joint cracking and detachment in hollow slab bridges can be effectively alleviated, thereby improving the overall stability of the bridge.

[0026] 2. The self-locking anchor bolt contains an expandable hinge joint connector, allowing the anchor bolt to be inserted and fixed into the hinge joint from bottom to top. A steel crossbeam can then be installed at its lower part. Throughout the entire bridge repair and reinforcement process, there is no damage or reconstruction of the bridge deck pavement; only construction under the bridge is required, resulting in minimal impact on traffic. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the transverse direction of the hinge joint reinforcement in Example 1;

[0028] Figure 2 yes Figure 1 Detailed drawing of the self-locking anchor bolt structure;

[0029] Figure 3 This is a schematic diagram of the longitudinal direction of the hinge joint reinforcement in Example 1;

[0030] Figure 4 This is a schematic diagram of the limiting sleeve structure.

[0031] in:

[0032] 1-Hollow plate; 2-Hinge joint; 3-Self-locking anchor rod; 31-Hinge joint clamp; 32-Rod body; 321-Hinge joint through part; 322-Connecting part; 33-Fastener; 4-Steel crossbeam; 41-Bottom support surface; 5-Expansion bolt; 6-Limiting sleeve; 61-Extension entrance; 62-Limiting contact surface. Detailed Implementation

[0033] To make the technical means, inventive features, objectives, and effects of this utility model readily understandable, the present utility model is further described below in conjunction with specific illustrations. However, this utility model is not limited to the following embodiments.

[0034] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0035] Example 1:

[0036] like Figure 1 The hollow slab bridge shown is basically composed of hollow slabs 1, with hinge joints 2 between each hollow slab 1. This invention provides a maintenance and reinforcement device for the hinge joints of hollow slab bridges. The device includes self-locking anchor rods 3 embedded in the hinge joints 2 and a steel crossbeam 4 installed at the bottom of the hollow slabs 1 and fitted onto the self-locking anchor rods 3. By precisely fixing the steel crossbeam 4 to the bottom of the hollow slabs 1 using the self-locking anchor rods 3, the hinge joints 2 are reinforced, and the lateral force transmission of the steel crossbeam 4 disperses the load, significantly improving the overall stability and load-bearing capacity of the bridge.

[0037] Among them, the self-locking anchor bolt 3 is an anchoring technology used for building renovation and reinforcement. It provides instantaneous anchoring force and ensures reliability by having the anchor head open at the bottom of the hole to form a mechanical interlocking force. For example... Figure 2 and Figure 3 As shown, the self-locking anchor rod 3 includes an expandable hinge joint 31 and a rod body 32. The surface of the rod body 32 is enhanced by machining threads or sandblasting to improve its adhesion.

[0038] like Figure 4 As shown, the rod body 32 also includes a connecting part 322 located below the hollow slab 1, and the bottom of the self-locking anchor rod 3 is detachably connected to a limiting sleeve 6. During construction, first, the center position of the hinge joint 2 between multiple hollow slabs 1 on the same cross section of the bridge is located. Then, a straight hole is drilled upward to the design depth at the corresponding position at the bottom of the hollow slab 1 using a geological drilling rig or a down-the-hole drilling rig, and the hole is enlarged at the bottom using a reaming drill bit. Subsequently, water is injected into the hole using a high-pressure grouting machine until clear water emerges from the top of the hole to ensure that the hole wall is clean. Then, the connecting part 322 of the self-locking anchor rod 3 is inserted into the limiting sleeve 6, and the self-locking anchor rod 3 is inserted into the bottom of the hole from bottom to top. When the limiting contact surface 62 of the limiting sleeve 6 abuts against the bottom of the hollow slab 1, it can be confirmed that the self-locking anchor rod 3 has reached the preset installation position. At this time, the user removes the limiting sleeve 6 and applies pressure to the tail of the self-locking anchor rod 3 to open its hinge joint 31 along the enlarged hole wall. The limiting sleeve 6 effectively prevents the hinge joint 31 from opening prematurely due to improper installation or operational errors, ensuring the accuracy and reliability of installation. Figure 3 As shown, the rod body 32 also includes a hinge joint through part 321 located between the hinge joints 2. The gaps between the hinge joint snap joint 31 and the hinge joint through part 321 and the hole wall are all treated with grouting, which can significantly enhance the bonding force between the self-locking anchor rod 3 and the hollow plate 1, ensure a firm connection between the two, and also provide additional anchoring force through frictional resistance along the way, thereby effectively improving the anchoring performance of the self-locking anchor rod 3 and ensuring that the self-locking anchor rod 3 is firmly locked in the hinge joint.

[0039] like Figure 3 As shown, the self-locking anchor rod 3 also includes fasteners 33 (such as high-strength bolts or self-locking clips). After the self-locking anchor rod 3 is installed and maintained, the user inserts the steel beam 4 onto the connecting part 322 and then gradually tightens the fasteners 33 to securely lock the steel beam 4. This process requires continuous pressure until the bottom surface 41 of the steel beam is completely in contact with the bottom of the hollow plate 1, ensuring a tight connection between the two. In this embodiment, for ease of transportation and assembly, the steel beam 4 is made of channel steel spliced ​​from multiple beam units. Both its upper and lower parts are provided with through holes that match the connecting part 322. Structural adhesive is applied between the inner wall of the through holes and the connecting part 322, and structural adhesive is also applied to the bottom surface 41. This can significantly improve the connection strength and stability between the steel beam 4 and the hollow plate 1. On the same cross-section, multiple self-locking anchor rods 3 fixedly connected in the hinge joint 2 serve as connecting media, making the steel beam 4 and the hollow plate 1 form an integral structure, enhancing the integrity and stability of the bridge.

[0040] Furthermore, since no self-locking anchor rods 3 are installed between the two ends of the hollow slab 1 and the steel beam 4, the connection between the bottom surface 41 and the hollow slab 1 may not be secure enough. Therefore, if... Figure 1As shown, in this embodiment, expansion bolts 5 are provided at both ends of the steel beam 4. With their high anchoring force and stability, the expansion bolts 5 can significantly enhance the connection strength between the steel beam 4 and the hollow plate 1, ensuring the overall stability of the structure.

Claims

1. A repair and reinforcement device for hinge joints in hollow slab bridges, characterized in that: It includes two or more self-locking anchor rods (3) and a steel beam (4) connected to the self-locking anchor rods (3); the self-locking anchor rod (3) includes a rod body (32) and an expandable hinge joint (31) located at the top of the rod body (32), the rod body (32) extends vertically and includes a hinge joint (321) and a connecting part (322) located at the bottom, the steel beam (4) extends horizontally and is connected to the connecting part (322), the steel beam (4) includes a bottom support surface (41) for supporting the bottom surface of the hollow plate (1).

2. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: The self-locking anchor (3) also includes fasteners (33) for connecting and fixing the steel beam (4) to the connecting part (322).

3. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: The steel beam (4) is a channel steel and has a through hole that matches the connecting part (322). Structural adhesive is applied between the inner wall of the through hole and the connecting part (322), and structural adhesive is applied to the bottom surface (41).

4. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: Grouting material is provided in the peripheral gaps of the hinge joint (31) and the hinge through part (321).

5. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 3, characterized in that: The steel beam (4) comprises multiple beam units.

6. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: The outer surface of the shaft (32) includes roughened protrusions.

7. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: Expansion bolts (5) are provided at both ends of the steel beam (4).

8. The repair and reinforcement device for the hinge joint of a hollow slab bridge according to claim 1, characterized in that: The bottom of the self-locking anchor (3) is detachably connected to a limiting sleeve (6), which includes an insertion port (61) for the connection part (322) to extend into and a limiting contact surface (62) for contacting the bottom surface of the hollow plate (1).

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