An adaptive support rebound displacement compensation device
By using an adaptive support rebound displacement compensation device, which combines a slider and a compression spring, the bridge deck stress problem caused by the settlement of the new bridge piers was solved, and the bridge deck settlement and stress were significantly reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI PROVINCIAL EXPRESSWAY INVESTMENT GRP CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-24
AI Technical Summary
In bridge widening projects, the settlement of the new bridge piers causes vertical dislocation and bending stress on the new and old bridge decks. Existing technologies are unable to effectively compensate for the settlement displacement of the bridge superstructure, resulting in excessive bending moment stress in the bridge deck joint area.
An adaptive bearing rebound displacement compensation device is designed. It utilizes a combination structure of a left slider, a right slider, and a compression spring. Through the inclined sliding of the cover plate and the rebound of the compression spring, it compensates for the settlement displacement of the bridge superstructure, so that the bridge deck settlement is only 10% to 20% of the pier settlement, and reduces the bending moment stress in the bridge deck joint area.
It effectively reduced the bridge deck settlement and the bending moment stress in the bridge deck joint area. The bridge deck settlement was only 10% to 20% of the pier settlement, which significantly reduced the bridge deck stress.
Smart Images
Figure CN224548937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge splicing technology, and in particular to an adaptive support rebound displacement compensation device. Background Technology
[0002] In bridge widening projects, the piers of the new bridge will settle for a period of time after its construction, while the old bridge has been completed for a long time and its settlement is basically complete. When the widened bridge is built, the bridge decks of the new and old bridges are on the same horizontal plane. However, in the first few years after the new bridge piers are built, creep foundation settlement will continue to occur. The settlement of the new bridge piers will cause the new bridge deck to be lower than the old bridge deck, resulting in vertical dislocation and bending normal stress in the widened section of the new and old bridge decks. Moreover, the bending stress caused by the settlement of the new bridge piers is much greater than the bending stress caused by vehicle loads.
[0003] Based on the above reasons, this utility model designs an adaptive support rebound displacement compensation device. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an adaptive support rebound displacement compensation device. When a widened bridge is built, the settlement of the new bridge piers causes vertical displacement of the bridge superstructure, which exerts downward pressure on the cover plate. This causes the cover plate to slide downward along the inclined plane of the left and right sliders. When the downward pressure of the cover plate acts on the inclined plane, it generates a component force that slides the left and right sliders to both sides. The rebound of the compression spring can compensate for the settlement displacement of the bridge superstructure, so that the bridge deck settlement is only 10% to 20% of the pier settlement, thereby significantly reducing the bending moment stress in the bridge deck joint area.
[0005] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: This utility model discloses an adaptive support rebound displacement compensation device, including a cover plate, a left slider, a right slider, a support rod, and a compression spring. The longitudinal section of the left slider is a right-angled trapezoidal structure, and its top forms an inclined surface with the bottom end sloping downward to the right. The right slider has the same shape as the left slider, and the bottom end of its top inclined surface slopes downward to the left. The ends of the left and right sliders are provided with through holes for the support rod to pass through. The compression spring is fitted on the outer walls of both sides of the support rod. The inner end of the compression spring contacts the outer end of the left or right slider, and the outer end of the compression spring is pressed by a clamping member. The cover plate has a square structure, and its bottom two sides form sliding surfaces with the same slope as the inclined surface.
[0006] The left and right sliders are placed on a base plate, and the surface of the base plate is provided with a groove for the left and right sliders to slide. The width of the groove is equal to the width of the left or right slider.
[0007] The bottom of the inner walls on both sides of the slide groove is provided with a square limiting groove, and the lower side walls of the left and right sliders are provided with limiting blocks with the same cross-section as the limiting groove.
[0008] The left and right sliders have side plates at the front and rear ends of the inclined surfaces at the top. The distance between the inner walls of the front and rear side plates is equal to the distance between the front and rear walls of the cover plate.
[0009] The clamping component includes a clamping nut and a washer. The internal thread of the clamping nut is matched and engaged with the external threads at both ends of the support rod. The washer is arranged in a ring structure between the clamping nut and the outer end of the compression spring.
[0010] The left and right sliders are provided with through holes on the front and rear sides of their ends for the support rods to pass through. Compression springs are fitted on both sides of the two support rods, and the outer ends of the compression springs are tightened by the top nut.
[0011] The beneficial effects of this utility model are as follows:
[0012] (1) When the new bridge is widened and completed, the settlement of the bridge piers causes the vertical displacement of the superstructure of the bridge, which in turn exerts downward pressure on the cover plate. This causes the cover plate to slide down along the slope of the left and right sliders. When the downward pressure of the cover plate acts on the slope, it will generate a component force that slides the left and right sliders to both sides. The rebound of the compression spring can compensate for the settlement displacement of the superstructure of the bridge, so that the settlement of the bridge deck is only 10% to 20% of the settlement of the piers, thereby greatly reducing the bending moment stress in the joint area of the bridge deck. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] Figure 2 This is a top view of the present invention;
[0015] Figure 3 for Figure 2 A cross-sectional view along AA;
[0016] Figure 4 for Figure 2 A cross-sectional view along BB;
[0017] Figure 5 The force diagram of the displacement compensation device before the loss of force;
[0018] Figure 6 This is a force analysis diagram of the right slider before it loses its force.
[0019] Figure 7 The force diagram of the displacement compensation device after the loss of force;
[0020] Figure 8 This is a force analysis diagram of the right slider after it loses its force.
[0021] Figure 9 This is a finite element model of the adaptive bearing rebound displacement compensation device for bridges, which is an extension of this utility model. In the attached figure, 1 is the cover plate, 2 is the left slider, 3 is the right slider, 4 is the support rod, 5 is the compression spring, 6 is the inclined surface, 7 is the through hole, 8 is the clamping part, 9 is the base plate, 10 is the sliding groove, 11 is the limiting groove, 12 is the limiting block, 13 is the side plate, 14 is the sliding surface, 81 is the clamping nut, and 82 is the washer. Detailed Implementation
[0022] The present invention will be further described below:
[0023] Please see Figure 1-9 ,
[0024] like Figure 1-4 As shown, this utility model discloses an adaptive support rebound displacement compensation device, including a cover plate 1, a left slider 2, a right slider 3, a support rod 4, and a compression spring 5. The longitudinal section of the left slider 2 is a right-angled trapezoidal structure, and its top forms an inclined surface 6 with the bottom end sloping downward to the right. The right slider 3 has the same shape as the left slider 2, and the bottom end of its top inclined surface 6 also slopes downward to the left. The ends of the left slider 2 and the right slider 3 are provided with through holes 7 for the support rod 4 to pass through. The compression spring 5 is fitted on the outer walls of both sides of the support rod 4. The inner end of the compression spring 5 contacts the outer end of the left slider 2 or the right slider 3, and the outer end of the compression spring 5 is pressed by a clamping member 8. The cover plate 1... The structure is square, with sliding surfaces 14 on both sides of its bottom having the same slope as the inclined surface 6. When the widened bridge is completed, the settlement of the bridge piers causes vertical displacement of the superstructure of the bridge, which puts downward pressure on the cover plate 1. This causes the cover plate 1 to slide down along the inclined surface 6 of the left slider 2 and the right slider 3. When the downward pressure of the cover plate 1 acts on the inclined surface 6, it will generate a component force that slides the left slider 2 and the right slider 3 to both sides. The rebound of the compression spring 5 can compensate for the settlement displacement of the superstructure of the bridge, so that the settlement of the bridge deck is reduced to only 10% to 20% of the settlement of the bridge piers (80% to 90%), thereby greatly reducing the bending moment stress in the joint area of the bridge deck.
[0025] Furthermore, the left slider 2 and the right slider 3 are placed on the base plate 9. The surface of the base plate 9 is provided with a groove 10 for the left slider 2 and the right slider 3 to slide. The width of the groove 10 is equal to the width of the left slider 2 or the right slider 3. By setting the base plate 9, it is ensured that the left slider 2 and the right slider 3 can slide smoothly to both sides. By setting the groove 10, it plays a guiding role to ensure that the left slider 2 and the right slider 3 will not be displaced in the forward and backward directions.
[0026] Furthermore, the bottom of the inner walls on both sides of the slide 10 is provided with square limiting grooves 11, and the lower side walls of the left slider 2 and the right slider 3 are provided with limiting blocks 12 with the same cross-section as the limiting grooves 11, so that the left slider 2 and the right slider 3 can be connected to the base plate 9 to form a whole, which is convenient for transportation, installation and disassembly.
[0027] Furthermore, the front and rear ends of the inclined surface 6 at the top of the left slider 2 and the right slider 3 are provided with side plates 13. The distance between the inner walls of the front side plate 13 and the rear side plate 13 is equal to the distance between the front and rear walls of the cover plate 1. By providing side plates 13 at the front and rear ends of the inclined surface 6, a cover plate groove is formed between the two side plates 13 for the cover plate 1 to slide along the inclined surface 6, ensuring that the cover plate 1 will not slide in the forward and backward direction.
[0028] Furthermore, the clamping component 8 includes a clamping nut 81 and a washer 82. The internal thread of the clamping nut 81 is matched and engaged with the external threads at both ends of the support rod 4. The washer 82 is arranged in a ring structure between the clamping nut 81 and the outer end of the compression spring 5. By setting the clamping nut 81 to engage with the threads at both ends of the support rod 4, the position of the outer end of the compression spring 5 can be finely adjusted, and the installation and removal of the compression spring 5 is also convenient.
[0029] Furthermore, the left slider 2 and the right slider 3 are provided with through holes 7 on the front and rear sides of their ends for the support rods 4 to pass through. The two sides of the support rods 4 are fitted with compression springs 5. The outer ends of the compression springs 5 are tightened by the tightening nuts 81. By providing support rods 4 on the front and rear sides of the left slider 2 and the right slider 3, and by providing compression springs 5 and tightening nuts 81 on the support rods 4, the settlement displacement of the upper structure can be further reduced.
[0030] This utility model relates to the design concept and calculation method of an "adaptive support rebound displacement compensation device" to prevent pier stress; including: 1) calculating the equivalent stiffness coefficient k of the superstructure of the "adaptive support rebound displacement compensation device"; 2) calculating the pressure P1 of the superstructure on the trapezoidal cover plate 1 (e.g., Figure 5 According to the static equilibrium condition, the pressure R1 between the left and right sliders and the cover plate 1 corresponding to a single compression spring 5 and the horizontal thrust R of the compression spring are obtained. 1x Relationships (such as) Figure 6 ), here R 1x It can also be viewed as the preload pressure of a single compression spring; 3) The settlement of the pier is d, the displacement compensation of the "adaptive support rebound displacement compensation device" is Δh, the actual settlement displacement of the bridge deck is d-Δh, and the horizontal thrust of the single compression spring becomes R. 2x The pressure of the upper structure on cover plate 1 is reduced from P1 to P2 (e.g., Figure 7Due to the equivalent stiffness coefficient k of the superstructure, the relationship between the support failure ΔP = P1 - P2 and the actual settlement displacement is ΔP = (d - Δh)k.
[0031] The theoretical basis of the "adaptive support rebound displacement compensation device" includes the following calculation steps:
[0032] 1. The equivalent stiffness coefficient k of the upper structure of the "adaptive support rebound displacement compensation device" is given by finite element simulation; the support force P1 of the support under gravity is calculated by finite element simulation.
[0033] 2. Through the discussion of Figure 2 The static equilibrium condition of the isolator yields the pressure R1 between the wedges corresponding to a single spring and the horizontal thrust R of the spring. 1x Relationship with the supporting force P1 of the trapezoidal cover plate
[0034]
[0035] Where f is the coefficient of friction, and θ is the angle between the inclined plane 6 and the horizontal plane (e.g., ...). Figure 2 (as shown);
[0036] 3. Under the action of the supporting force P1 on cover plate 1 (e.g. Figure 5 The pre-compression of the horizontal compression spring is h. 1x =R 1x / (k3 / 4), the four compression springs in the "adaptive support springback displacement compensation device" (see...) Figure 1 The total stiffness of the bridge pier is k3, and the stiffness of each compression spring 5 is k3 / 4. The corresponding downward pressure on the trapezoidal steel plate pier using the "adaptive support rebound displacement compensation device" is h. 1y
[0037]
[0038] 4. When the pier settles by a displacement d, the pressure on the support cover plate 1 is P2. Figure 7 The horizontal thrust of a single compression spring 5 becomes R. 2x Taking either the left slider 2 or the right slider 3 under the action of a single compression spring 5 as the research object, Figure 8 The static equilibrium condition of the isolated body is
[0039]
[0040] 3. When the pier settles by a displacement d, the compression of the horizontal compression spring of the "adaptive support rebound displacement compensation device" changes from h. 1x Reduce to h 2x (See Figure 8 The corresponding settlement of pier 1 is reduced to h. 2y :
[0041]
[0042] 5. The settlement of the bridge pier is d, and the upward displacement compensation of the "adaptive support rebound displacement compensation device" is Δh = h. 1y -h 2y The actual settlement displacement d-Δh of the bridge deck is
[0043]
[0044] 6. Due to the equivalent stiffness coefficient k of the superstructure, the relationship between the support stress ΔP = P1 - P2 of the "adaptive support rebound displacement compensation device" and the actual settlement displacement is as follows:
[0045] ΔP=k(d-Δh) (6)
[0047] 7. The failure without an "adaptive support rebound displacement compensation device" is...
[0048] ΔP=kd (7)
[0050] Example:
[0051] The "adaptive bearing rebound displacement compensation device" for bridge piers has been installed and applied in the widening of the old and new bridge decks of a highway in Jiangxi Province. The material quality, elastic modulus, and Poisson's ratio of the bridge's T-beams, deck paving structure, reinforced concrete, and other components were obtained through finite element simulation calculations.
[0052] 1) The stiffness of the upper structure of the "adaptive support rebound displacement compensation device" (i.e. the force required to generate a unit upward displacement) k = 150.01 kN / mm;
[0053] 2) The pressure P1 coming from the support of the "adaptive support rebound displacement compensation device" is 700.04 kN;
[0054] 3) Based on the actual results of the widening of the bridge decks of the new and old bridges mentioned above, the "adaptive support rebound displacement compensation device" we designed includes four compression springs 5 (see...). Figure 1 The total stiffness of the spring is k3 = 7.5 kN / mm, the stiffness of each compression spring 5 is k3 / 4 = 1.875 kN / mm, and the angle θ between the inclined plane 6 of the left and right sliders and the horizontal plane is 20°.
[0055] Substituting the above data into equations (5), (6), and (7), the results are listed in Tables 1 and 2. The results from Tables 1 and 2 show that the "adaptive bearing rebound displacement compensation device" can reduce the displacement settlement of the bridge deck and the loss of bridge bearing force to only about 16.5% of that without the "adaptive bearing rebound displacement compensation device", which greatly reduces the additional stress on the superstructure of the bridge when widening the new and old bridge decks.
[0056] Table 1 Comparison of bridge deck settlement displacement with and without adaptive bearing rebound displacement compensation device.
[0057]
[0058] Table 2 Comparison of stress loss caused by subsidence with and without adaptive support rebound displacement compensation device.
[0059]
[0060] A finite element solid model of the widened bridge superstructure was created using SOLIDWORKS software (e.g., ...). Figure 9 The adaptive device was placed on the inner support of the new bridge near the joint section to replace the original support. Two adaptive devices were placed longitudinally at this location, as shown in the figure. Except for the adaptive device, all other structures of the bridge used C50 concrete as the base material. The contact portion between each support and the bottom of its corresponding T-beam was set as friction contact with a friction coefficient of 0.6. All other structures were bonded together. For a pier settlement of 5mm, we conducted a detailed analysis of the settlement displacement of the bridge superstructure and compared these results with simulation results of a bridge without the adaptive connection device. Compared to the case without the adaptive connection device, the settlement displacement of the bridge deck was significantly reduced with the device installed, decreasing from 4.926mm to 0.523mm, a reduction of 90%. This result demonstrates that the adaptive connection device has a significant effect on reducing the settlement displacement of the bridge superstructure.
[0061] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An adaptive support rebound displacement compensation device, characterized in that: Includes a cover plate (1), a left slider (2), a right slider (3), a support rod (4), and a compression spring (5). The longitudinal section of the left slider (2) is a right trapezoidal structure, and its top forms an inclined surface (6) with the bottom end sloping downward to the right. The right slider (3) has the same shape as the left slider (2), and the bottom end of the inclined surface (6) at its top slopes downward to the left. The ends of the left slider (2) and the right slider (3) are provided with through holes (7) for the support rod (4) to pass through. The compression spring (5) is fitted on the outer side of both sides of the support rod (4). The inner end of the compression spring (5) contacts the outer end of the left slider (2) or the right slider (3). The outer end of the compression spring (5) is pressed by a clamping member (8). The cover plate (1) has a square structure, and sliding surfaces (14) with the same slope as the inclined surface (6) are formed on both sides of its bottom.
2. The adaptive support rebound displacement compensation device according to claim 1, characterized in that: The left slider (2) and the right slider (3) are placed on the base plate (9). The surface of the base plate (9) is provided with a groove (10) for sliding the left slider (2) and the right slider (3). The width of the groove (10) is equal to the width of the left slider (2) or the right slider (3).
3. The adaptive support rebound displacement compensation device according to claim 2, characterized in that: The bottom of the inner walls on both sides of the slide (10) is provided with a square limiting groove (11), and the bottom of the inner walls on both sides of the left slider (2) and the right slider (3) is provided with a limiting block (12) with the same cross-section as the limiting groove (11).
4. The adaptive support rebound displacement compensation device according to claim 3, characterized in that: The front and rear ends of the inclined surface (6) at the top of the left slider (2) and the right slider (3) are provided with side plates (13), and the distance between the inner walls of the front side plate (13) and the rear side plate (13) is equal to the distance between the front and rear walls of the cover plate (1).
5. The adaptive support rebound displacement compensation device according to claim 4, characterized in that: The clamping member (8) includes a clamping nut (81) and a washer (82). The internal thread of the clamping nut (81) is matched and engaged with the external threads at both ends of the support rod (4). The washer (82) is arranged in a ring structure between the clamping nut (81) and the outer end of the compression spring (5).
6. The adaptive support rebound displacement compensation device according to claim 5, characterized in that: The left slider (2) and the right slider (3) are provided with through holes (7) on the front and rear sides for the support rod (4) to pass through. The two support rods (4) are fitted with compression springs (5) on both sides. The outer ends of the compression springs (5) are tightened by the top nut (81).