Steel-free expansion joint structure

Abstract

The utility model discloses a kind of free type steel expansion joint structures, including telescopic filling body and fixed mechanism, the telescopic filling body is filled in the expansion joint formed by adjacent bridge body;The fixed mechanism includes embedded pole, embedded cylinder and mortar layer, multiple the embedded pole is spaced on telescopic filling body along the length direction of telescopic filling body, multiple the embedded cylinder is spaced on the side wall of bridge body along the length direction of expansion joint, the embedded pole is located in embedded cylinder, the mortar layer is filled in embedded cylinder, the beneficial effects of the utility model are that: the hidden danger of traditional type steel bending deformation, anchoring bolt loosening fracture is avoided in free type steel design, embedded pole and telescopic filling body integrated design and mortar layer embedded type anchoring, make fixed mechanism impact resistance, fatigue resistance ability greatly promote, service life is extended, reduce the problem such as car jumping, road surface damage caused by type steel failure.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint construction, specifically to a steel-free expansion joint structure. Background Technology

[0002] In the construction of transportation infrastructure such as highways and bridges, expansion joints are key components that adapt to the thermal expansion and contraction and settlement deformation of the structure. Their performance directly affects driving safety and structural durability. Traditional expansion joints mostly adopt a structural design that combines steel profiles with rubber sealing strips. The steel profiles provide rigid support, while the rubber strips achieve sealing and expansion.

[0003] Under complex conditions such as long-term vehicle load impact, rainwater erosion, and temperature cycling, expansion joints are prone to problems such as steel deformation, loosening and breakage of anchor bolts, and aging and detachment of rubber strips, leading to failure and subsequent chain reactions of hazards such as vehicle bouncing, noise, and road surface damage. Furthermore, subsequent repairs require road excavation and steel replacement, resulting in long construction periods, significant traffic disruption, and high maintenance costs. With increasing traffic volume and rising demands for road quality, there is an urgent need for a new type of expansion joint structure that is simplified, durable, and easy to maintain. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a steel-free expansion joint structure to solve the technical problem of easy loosening and failure of steel in the prior art.

[0005] To achieve the above technical objectives, the present invention provides a steel-free expansion joint structure, comprising an expansion filler that fills the expansion joint formed by adjacent bridge sections; and, The fixing mechanism includes embedded rods, embedded cylinders, and mortar layers. A plurality of embedded rods are spaced apart on the expansion filler along the length direction of the expansion joint, and a plurality of embedded cylinders are spaced apart on the side wall of the bridge body along the length direction of the expansion joint. The embedded rods are located inside the embedded cylinders, and the mortar layers are filled inside the embedded cylinders.

[0006] In some embodiments, the top two sides of the telescopic infill body are provided with sealing flanges, the sealing flanges overlap the top of the adjacent bridge body, and a sealing adhesive layer is filled between the sealing flanges and the bridge body.

[0007] In some embodiments, an inclined surface is formed between the sealing flange and the bridge body, the inclined surface being inclined toward the bridge body.

[0008] In some embodiments, the top of the telescopic filler is provided with an anti-slip layer.

[0009] In some embodiments, the telescopic filler body is provided with a telescopic cavity.

[0010] In some embodiments, the telescopic cavity is filled with elastic foam adhesive.

[0011] In some embodiments, the fixing mechanism further includes anti-dislodgement devices, and a plurality of anti-dislodgement devices are spaced and connected to the end of the pre-embedded rod.

[0012] In some embodiments, the fixing mechanism further includes an elastic sleeve, which is fitted onto the end of the embedded rod, and the mortar layer is filled between the elastic sleeve and the embedded cylinder.

[0013] Compared with the prior art, the beneficial effects of this utility model include: the steel-free design avoids the hidden dangers of bending deformation of traditional steel and loosening and breakage of anchor bolts; the integrated design of the pre-embedded rod and the telescopic filler and the embedded anchoring of the mortar layer greatly improve the impact resistance and fatigue resistance of the fixing mechanism, extend its service life, and reduce problems such as vehicle bounce and road damage caused by steel failure. Attached Figure Description

[0014] Figure 1 This is an overall structural cross-sectional view of the steel-free expansion joint structure provided by this utility model; Figure 2 This utility model provides Figure 1 Enlarged view of the local structure at point A; Figure 3 This is a top view of the overall structure of the steel-free expansion joint structure provided by this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Expansion filler; 11. Sealing flange; 12. Sealing layer; 13. Anti-slip layer; 14. Expansion cavity; 15. Elastic foam adhesive; 2. Bridge body; 21. Expansion joint; 22. Inclined surface; 3. Fixing mechanism; 31. Embedded rod; 32. Embedded cylinder; 33. Mortar layer; 34. Anti-burr removal; 35. Elastic sleeve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0017] This utility model provides a steel-free expansion joint structure, the structure of which is as follows: Figure 1 - Figure 3 As shown, it includes a telescopic filler 1 and a fixing mechanism 3.

[0018] The expansion filler 1 fills the expansion joint 21 formed by the adjacent bridge body 2.

[0019] The fixing mechanism 3 includes embedded rods 31, embedded cylinders 32, and mortar layer 33. A plurality of embedded rods 31 are spaced apart on the expansion filler 1 along the length direction of the expansion filler 1, and a plurality of embedded cylinders 32 are spaced apart on the side wall of the bridge body 2 along the length direction of the expansion joint 21. The embedded rods 31 are located inside the embedded cylinders 32, and the mortar layer 33 is filled inside the embedded cylinders 32.

[0020] During use, when the expansion joint filler 1 is prefabricated, the embedded rods 31 are integrally installed at intervals along their length. During construction, the embedded cylinders 32 are fitted onto the embedded rods 31. Vertical grooves are temporarily opened on the adjacent bridge body 2, and the expansion joint filler 1 is embedded into the expansion joint 21 of the adjacent bridge body 2. At the same time, the embedded cylinders 32 are pre-embedded in each vertical groove along the length of the expansion joint 21. Mortar is then poured into the vertical grooves, and the mortar is poured into the embedded cylinder 32 through the opening until the mortar dries, forming a mortar layer 33, which forms a fixed support point, thereby firmly fixing the expansion joint filler 1 to the bridge body 2. The expansion joint filler 1 is integrally molded from highly elastic and highly wear-resistant modified polyurethane. Its own elasticity can directly adapt to the expansion and contraction deformation of the bridge body 2 caused by temperature cycles and settlement. The expansion joint filler 1 is tightly fitted to the side wall of the bridge body 2, and the integrated structure has no splicing joints. Combined with the mortar sealing of the embedded rods 31 and the embedded cylinders 32, a comprehensive sealing system is formed.

[0021] In this utility model, the steel-free design avoids the hidden dangers of bending deformation of traditional steel and loosening and breakage of anchor bolts. The pre-embedded rod 31 and the telescopic filler 1 are integrated and embedded in the mortar layer 33 for anchoring, which greatly improves the impact resistance and fatigue resistance of the fixing mechanism 3, extends its service life, and reduces problems such as vehicle bounce and road damage caused by steel failure.

[0022] To further improve the sealing between the expansion filler 1 and the bridge body 2, please refer to... Figure 1 In a preferred embodiment, the top two sides of the telescopic filler 1 are provided with sealing flanges 11, the sealing flanges 11 overlap the top of the adjacent bridge body 2, and a sealing adhesive layer 12 is filled between the sealing flanges 11 and the bridge body 2.

[0023] During use, the sealing flange 11 overlaps the top of the bridge body 2, and together with the sealing adhesive layer 12 between it and the bridge body 2, a comprehensive top sealing system is formed. This prevents rainwater, snowmelt, and debris from seeping through the joint between the expansion filler 1 and the top of the bridge body 2, thus avoiding softening of the mortar layer 33, corrosion of the embedded rod 31, and corrosion of the steel reinforcement of the bridge body 2.

[0024] To reduce the possibility of damage to the expansion filler 1, please refer to Figure 1 In a preferred embodiment, a slope 22 is formed between the sealing flange 11 and the bridge body 2, and the slope 22 is inclined toward the bridge body 2.

[0025] During use, as the vehicle tire passes through the joint, the inclined surface 22 forms a gradual transition, and the tire pressure is gradually transferred along the inclined surface 22 to the telescopic insulator 1 and the bridge body 2, avoiding the load concentration at the corners of the telescopic insulator 1 caused by traditional right-angle joints. This prevents the corners of the insulator from warping or cracking due to long-term impact, further extending the service life of the telescopic insulator 1.

[0026] To increase the friction at the top of the stretchable filler 1, please refer to... Figure 3 In a preferred embodiment, the top of the telescopic filler 1 is provided with an anti-slip layer 13.

[0027] When in use, the anti-slip layer 13 has an anti-slip texture, which can greatly improve the friction coefficient of the top surface of the stretch filler 1. Even in wet conditions such as rain or melting snow, it can provide sufficient grip for the vehicle tires and prevent the tires from slipping or shifting to the side.

[0028] To further improve the elasticity of the stretchable filler 1, please refer to... Figure 1 In a preferred embodiment, the telescopic filler 1 is provided with a telescopic cavity 14.

[0029] In use, the telescopic cavity 14 provides additional deformation space for the telescopic filler 1. When the bridge body 2 is displaced due to temperature cycling or settlement, the telescopic filler 1 can achieve flexible deformation through the compression and rebound of the telescopic cavity 14 without relying on the ultimate elasticity of its own material, thus meeting the complex deformation requirements of long-span bridges.

[0030] To improve the uniformity of expansion and contraction of the telescopic cavity 14, please refer to... Figure 1 In a preferred embodiment, the telescopic cavity 14 is filled with elastic foam adhesive 15.

[0031] During use, the elastic foam 15 exhibits excellent compression and rebound properties. After filling, it forms a dual elastic synergy with the expansion filler 1. When the bridge body 2 expands, the elastic foam 15 compresses simultaneously to absorb stress, preventing the expansion cavity 14 wall from denting or tearing due to excessive local stress. When the bridge body 2 contracts, the elastic foam 15 rebounds elastically, helping the expansion filler 1 to quickly return to its original position, ensuring that the expansion joint 21 remains tightly closed without gaps.

[0032] To improve the stability of the stretchable filler 1, please refer to... Figure 2 In a preferred embodiment, the fixing mechanism 3 further includes anti-splurge 34, and a plurality of anti-splurge 34 are spaced apart and connected to the end of the pre-embedded rod 31.

[0033] During use, the anti-detachment spikes 34 are distributed in a barbed shape at the end of the embedded rod 31. After the mortar layer 33 is poured, the anti-detachment spikes 34 will be firmly embedded in the solidified mortar, forming a three-dimensional interlocking structure. Even under long-term impact from vehicle loads, vibration of the bridge body 2, or tensile forces generated by temperature deformation, the embedded rod 31 can be prevented from detaching from the mortar layer 33, ensuring that the connection between the expansion filler 1 and the bridge body 2 remains firm.

[0034] To reduce the likelihood of cracking in mortar layer 33, please refer to... Figure 2 In a preferred embodiment, the fixing mechanism 3 further includes an elastic sleeve 35, which is sleeved on the end of the embedded rod 31, and the mortar layer 33 is filled between the elastic sleeve 35 and the embedded cylinder 32.

[0035] When in use, the elastic sleeve 35 is made of rubber and has excellent elastic deformation ability. It can absorb the small displacement of the bridge body 2 caused by temperature cycle and settlement, as well as the vibration and impact caused by vehicle load. When the bridge body 2 deforms, the elastic sleeve 35 buffers the stress through its own compression and rebound, avoiding the rigid constraint that causes the mortar layer 33 to crack or fall off.

[0036] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of the steel-free expansion joint 21 structure of this utility model is described in detail below: During the prefabrication of the expansion filler 1, embedded rods 31 are integrally set at intervals along their length. During construction, embedded cylinders 32 are fitted onto the embedded rods 31. Temporary vertical grooves are opened on adjacent bridge bodies 2, and the expansion filler 1 is embedded into the expansion joint 21 of the adjacent bridge body 2. Simultaneously, embedded cylinders 32 are pre-embedded in each vertical groove along the length of the expansion joint 21. Mortar is then poured into the vertical grooves, flowing through the opening of the embedded cylinder 32 until it dries, forming a mortar layer 33, which forms a fixed support point, thereby firmly fixing the expansion filler 1 to the bridge body 2. The expansion filler 1 is integrally molded from highly elastic and highly wear-resistant modified polyurethane, and its own elasticity can directly adapt to the expansion and contraction deformation of the bridge body 2 caused by temperature cycles and settlement. The expansion filler 1 fits tightly against the side wall of the bridge body 2, forming an integrated structure without splicing seams. Combined with the mortar sealing of the pre-embedded rod 31 and the pre-embedded cylinder 32, it forms an all-round sealing system.

[0037] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A steel-free expansion joint structure, characterized in that, include: Expansion filler (1), which fills the expansion joint (21) formed by adjacent bridge bodies (2); as well as, The fixing mechanism (3) includes a pre-embedded rod (31), a pre-embedded cylinder (32) and a mortar layer (33). A plurality of the pre-embedded rods (31) are spaced apart on the expansion filler (1) along the length direction of the expansion filler (1), and a plurality of the pre-embedded cylinders (32) are spaced apart on the side wall of the bridge body (2) along the length direction of the expansion joint (21). The pre-embedded rods (31) are located inside the pre-embedded cylinders (32), and the mortar layer (33) is filled inside the pre-embedded cylinders (32).

2. The steel-free expansion joint structure according to claim 1, characterized in that, The top two sides of the telescopic filler (1) are provided with sealing flanges (11), which overlap the top of the adjacent bridge body (2), and a sealing adhesive layer (12) is filled between the sealing flange (11) and the bridge body (2).

3. The steel-free expansion joint structure according to claim 2, characterized in that, An inclined surface (22) is formed between the sealing flange (11) and the bridge body (2), and the inclined surface (22) is inclined toward the bridge body (2).

4. The steel-free expansion joint structure according to claim 1, characterized in that, The top of the telescopic filler (1) is provided with an anti-slip layer (13).

5. A steel-free expansion joint structure according to claim 1, characterized in that, The telescopic filler (1) is provided with a telescopic cavity (14).

6. A steel-free expansion joint structure according to claim 5, characterized in that, The telescopic cavity (14) is filled with elastic foam adhesive (15).

7. The steel-free expansion joint structure according to claim 1, characterized in that, The fixing mechanism (3) also includes anti-detachment spikes (34), and multiple anti-detachment spikes (34) are spaced apart and connected to the end of the pre-embedded rod (31).

8. A steel-free expansion joint structure according to claim 1, characterized in that, The fixing mechanism (3) also includes an elastic sleeve (35), which is sleeved on the end of the embedded rod (31), and the mortar layer (33) is filled between the elastic sleeve (35) and the embedded cylinder (32).

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