Maintenance structure of widened embankment slope bridge foundation
By combining cantilever retaining walls with sheet piles, the problem that traditional sheet piles cannot meet the stiffness and deformation requirements is solved, thus achieving stable support for bridge foundations and reducing the amount of engineering work.
Patent Information
- Application Number
- CN202520206925.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-10
AI Technical Summary
Traditional steel sheet piles cannot meet the stiffness and deformation requirements of bridge foundations on widened embankment slopes, and the large gaps left after the steel pipe piles are pulled out affect the stability of the roadbed, resulting in significant eccentric pressure on the bridge foundation.
The structure adopts a combination of cantilever retaining wall and sheet pile. The cantilever retaining wall bears the eccentric pressure at the high fill position, while the sheet pile provides support at the low fill position. The design takes into account the characteristics of earth pressure, meets the stiffness and deformation requirements, and reduces the amount of work.
It effectively supports bridge foundations, reduces engineering work, ensures deformation requirements during embankment backfilling, and improves roadbed stability and aesthetics.
Smart Images
Figure CN223838120U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of civil engineering technology, specifically to a maintenance structure for the foundation of a bridge on a widened embankment slope. Background Technology
[0002] With the saturation of China's civil engineering industry, the reconstruction and expansion of existing roads has gradually emerged. Due to the large traffic demand after expansion and the limited expansion space, the current common expansion method is to widen the two sides of the ground level and build a new three-dimensional bridge. When the widened roadbed is a high embankment, the abutment of the three-dimensional bridge will be completely within the embankment soil filled in the ground level. If the abutment elevation is lowered, the bridge piers will be subjected to a great eccentric pressure from the high embankment soil. At the same time, in order to meet the aesthetic requirements of the bridge, it is necessary to bury the abutment in the embankment soil.
[0003] To ensure the compaction quality of the widened embankment and avoid eccentric pressure on the bridge foundation during the embankment construction, the general approach is to construct the embankment first, then build the retaining structure, excavate the embankment, then construct the bridge foundation, and finally backfill the foundation pit. At the same time, due to the large height of the embankment, traditional steel sheet piles cannot meet the stiffness and deformation requirements, and the large cross-sectional area of steel pipe piles leaves a large gap in the embankment after extraction, which has a significant impact on the stability of the widened roadbed. Utility Model Content
[0004] Therefore, it is necessary to provide a maintenance structure for bridge foundations on widened embankment slopes, addressing the issue that traditional steel sheet piles cannot meet the stiffness and deformation requirements of existing bridge foundation construction maintenance structures.
[0005] A maintenance structure for the foundation of a bridge on a widened embankment slope includes:
[0006] A cantilever retaining wall is installed on the side of a bridge foundation near the widened embankment. The cantilever retaining wall has a toe plate and a retaining wall disposed on the toe plate. The retaining wall circumferentially surrounds the bridge foundation and forms an opening on the side away from the widened embankment.
[0007] Two sets of sheet piles are respectively connected to the retaining walls on both sides of the gap, and the combined length of the sheet piles and the retaining walls is greater than or equal to the length of the bridge foundation.
[0008] In one embodiment, the toe plate is provided with a construction space for the construction of the bridge foundation.
[0009] In one embodiment, the retaining wall includes a level retaining wall facing the widened embankment and variable-height retaining walls on both sides of the level retaining wall, the variable-height retaining walls gradually decreasing in height away from the level retaining wall.
[0010] In one embodiment, the toe plate extends beyond the retaining wall in a direction close to the widened embankment.
[0011] In one embodiment, the bottom surface of the toe plate away from the retaining wall has a protrusion, and the protrusion is arranged opposite to the retaining wall.
[0012] In one embodiment, the thickness of the equal-height retaining wall gradually decreases in the direction away from the toe plate.
[0013] In one embodiment, the sidewall of the variable-height retaining wall is flush with the sidewall of the toe plate.
[0014] In one embodiment, the toe plate extends beyond the variable-height retaining wall in a direction close to the bridge foundation.
[0015] In one embodiment, the end face of the variable height retaining wall is provided with an installation groove, and the steel sheet pile is inserted into the installation groove for fixation.
[0016] In one embodiment, after the sheet pile is pulled out, concrete is injected into the hole formed by the sheet pile.
[0017] The aforementioned retaining structure for the bridge foundation on the widened embankment slope, taking into account the characteristics of the high-fill embankment slope, is designed as a combined retaining wall and sheet pile retaining structure. Permanent retaining walls are used where the fill height is large, while sheet piles are used where the fill height is small on the sloping surface. The retaining walls primarily bear the eccentric pressure of the high fill, while the sheet piles primarily bear the eccentric pressure of the low fill. The sheet piles can meet the stiffness and deformation requirements, while the low fill is supported by sheet piles. Based on the characteristics of earth pressure, targeted support is adopted to ensure the deformation requirements during the embankment backfilling and compaction process while minimizing the amount of work. Attached Figure Description
[0018] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.
[0019] Figure 1 This is a schematic diagram of the maintenance structure for the bridge foundation of a widened embankment slope in one embodiment;
[0020] Figure 2 for Figure 1 Top view of the maintenance structure shown;
[0021] Figure 3 for Figure 1 Structural schematic diagram of a cantilever retaining wall;
[0022] Figure 4This is a schematic diagram showing the connection between sheet piles and a variable-height retaining wall.
[0023] Figure 5 This is a schematic diagram of a layered backfill embankment.
[0024] Figure 6 This is a schematic diagram of the construction of bridge pile foundations;
[0025] Figure 7 This is a schematic diagram of the construction of a bridge pier.
[0026] Figure 8 A schematic diagram of the construction of a cantilever retaining wall and sheet piles;
[0027] Figure 9 A schematic diagram showing the symmetrical backfilling and compaction of the inner and outer soil of the maintenance structure;
[0028] Figure 10 This is a schematic diagram of grouting the holes formed by steel sheet piles.
[0029] Figure label:
[0030] 1-Bridge foundation, 2-Wide embankment, 10-Cantilever retaining wall, 11-Toe slab, 111-Construction space, 112-Protrusion, 12-Retaining wall, 121-Equal height retaining wall, 122-Variable height retaining wall, 123-Installation slot, 13-Notch, 20-Sheet pile. Detailed Implementation
[0031] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0032] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0034] Please see Figure 1 One embodiment of the retaining structure for the bridge foundation of the widened embankment slope includes a cantilever retaining wall 10 and sheet piles 20.
[0035] The cantilever retaining wall 10 is located on the side of the bridge foundation 1 near the widened embankment 2, that is, the cantilever retaining wall 10 is installed at the position with a large embankment height so that the cantilever retaining wall 10 can bear the eccentric pressure of the high embankment.
[0036] Please refer to the following: Figure 2 and Figure 3 In one embodiment, the cantilever retaining wall 10 has a toe plate 11 and a retaining wall 12 disposed on the toe plate 11. The toe plate 11 is used to be buried in the soil to improve the pull-out resistance of the cantilever retaining wall 10, and the retaining wall 12 is used to bear the eccentric pressure of the soil.
[0037] The retaining wall 12 surrounds the bridge foundation 1 circumferentially, thus protecting the bridge foundation 1 and preventing the eccentric pressure of the soil from affecting the bridge foundation 1. A gap 13 is formed on the side of the retaining wall 12 away from the widened embankment 2, which facilitates the construction of the bridge foundation 1 within the retaining wall 12.
[0038] In one embodiment, the toe slab 11 is provided with a construction space 111 for the construction of the bridge foundation 1, enabling the construction of bridge pile foundations and abutments. The retaining wall 12 includes a constant-height retaining wall 121 facing the widened embankment 2 and variable-height retaining walls 122 located on both sides of the constant-height retaining wall 121. The variable-height retaining walls 122 gradually decrease in height away from the constant-height retaining wall 121. Since the earth pressure gradually decreases away from the widened embankment 2, the variable-height retaining walls 122 are specifically designed. Based on the characteristics of the earth pressure, targeted support is provided to minimize the amount of work and save materials.
[0039] In one embodiment, the toe plate 11 extends beyond the retaining wall 121 in the direction close to the widened embankment 2, that is, the toe plate 11 extends beyond the retaining wall 121 by a certain distance. The retaining wall 121 and the toe plate 11 generally form an inverted T shape, which can improve the pull-out resistance of the cantilever retaining wall 10.
[0040] In one embodiment, a protrusion 112 is provided on the side of the toe plate 11 away from the retaining wall 121. The protrusion 112 is positioned opposite to the retaining wall 121, meaning that the protrusion 112 and the retaining wall 121 are located on opposite sides of the toe plate 11, and their central axes are aligned. The protrusion 112 can be used for positioning during the construction of the cantilever retaining wall 10, and it can also enhance the strength of the cantilever retaining wall 10, preventing damage to the toe plate 11.
[0041] In one embodiment, the thickness of the retaining wall 121 gradually decreases in the direction away from the toe plate 11, that is, the retaining wall 121 gradually becomes thicker with the depth of the soil. Since the soil pressure gradually decreases with the depth of the soil, the thickness of the retaining wall 121 gradually decreases. Based on the characteristics of the soil pressure, targeted support is carried out to minimize the amount of work and save materials.
[0042] In one embodiment, the sidewall of the variable height retaining wall 122 is flush with the sidewall of the toe plate 11, and the toe plate 11 extends beyond the variable height retaining wall 122 in a direction close to the bridge foundation 1. The toe plate 11 has a large area, which can improve the pull-out resistance of the cantilever retaining wall 10.
[0043] Two sets of sheet piles 20 are provided, and the two types of sheet piles 20 are respectively connected to the retaining walls 12 on both sides of the gap 13. The combined length of the sheet piles 20 and the retaining walls 12 is greater than the length of the bridge foundation 1, so that the retaining structure composed of the sheet piles 20 and the retaining walls 12 can completely cover the bridge foundation 1 and avoid the bridge foundation 1 from bearing soil pressure.
[0044] Please refer to the following: Figure 4 In one embodiment, the end face of the variable-height retaining wall 122 is provided with an installation groove 123. Sheet piles 20 are inserted into the installation groove 123 and fixed, thus connecting the sheet piles 20 to the retaining wall 12. The connection between the sheet piles 20 and the retaining wall 12 via the installation groove 123 improves the connectivity between the cantilever retaining wall 10 and the sheet piles 20, while also increasing the rigidity of the sheet pile support. Specifically, the installation groove 123 is 6x20cm in size. Cut sheet piles 20 are driven into the installation groove 123 of the retaining wall 12, increasing the overlap length between the sheet piles 20 and the retaining wall 12.
[0045] In one embodiment, after the bridge foundation 1 is constructed, the sheet piles 20 need to be pulled out. After the sheet piles 20 are pulled out, holes will be left in the soil, affecting the stability of the soil. Therefore, after the sheet piles 20 are pulled out, concrete is injected into the holes formed by the sheet piles 20 to improve the strength of the soil.
[0046] The construction process of the maintenance structure for the bridge foundation of the aforementioned widened embankment slope is as follows:
[0047] like Figure 5 As shown, firstly, backfill in layers to 100cm above the top of the pile foundation. The compaction degree of the overfilled 100cm section can be reduced to 85%, and the requirements for the backfill material are not high. For example... Figure 6 As shown, then, the bridge pile foundations are constructed. (As indicated) Figure 7 As shown, after the pile foundation inspection was passed, back excavation was carried out to the pile top elevation, the pile heads were broken, and the bridge abutment was constructed. Figure 8 As shown, next, the cantilever retaining wall 10 and sheet piles 20 are constructed. Figure 9As shown, again, symmetrical backfilling and compaction are performed inside and outside the retaining structure. (See diagram) Figure 10 As shown, finally, after the sheet pile 20 is pulled out, the hole formed by the sheet pile 20 is grouted.
[0048] The aforementioned retaining structure for the bridge foundation on the widened embankment slope, taking into account the characteristics of the high-fill embankment slope, is designed as a combined retaining wall and sheet pile 20 structure. Permanent retaining walls are used where the fill height is high, while sheet pile 20 is used where the fill height is low on the sloping surface. The retaining walls primarily bear the eccentric pressure of the high fill, while the sheet pile 20 primarily bears the eccentric pressure of the low fill. The sheet pile 20 meets the stiffness and deformation requirements. Simultaneously, the low fill is supported by sheet pile 20. Based on the characteristics of earth pressure, targeted support is adopted to ensure the deformation requirements during the embankment backfilling and compaction process while minimizing the amount of work.
[0049] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A maintenance structure for bridge foundations on widened embankment slopes, characterized in that, include: A cantilever retaining wall is provided on the side of the bridge foundation near the widened embankment. The cantilever retaining wall has a toe plate and a retaining wall provided on the toe plate. The retaining wall surrounds the bridge foundation circumferentially and forms a gap on the side away from the widened embankment. and Two sets of sheet piles are respectively connected to the retaining walls on both sides of the gap, and the combined length of the sheet piles and the retaining walls is greater than or equal to the length of the bridge foundation.
2. The maintenance structure for bridge foundations on widened embankment slopes according to claim 1, characterized in that, The toe plate is provided with a construction space for the construction of the bridge foundation.
3. The maintenance structure for bridge foundations on widened embankment slopes according to claim 1, characterized in that, The retaining wall includes a constant-height retaining wall facing the widened embankment, and variable-height retaining walls located on both sides of the constant-height retaining wall, wherein the variable-height retaining walls gradually decrease in height along the direction away from the constant-height retaining wall.
4. The maintenance structure for bridge foundations on widened embankment slopes according to claim 3, characterized in that, The toe plate extends beyond the retaining wall in a direction close to the widened embankment.
5. The maintenance structure for bridge foundations on widened embankment slopes according to claim 4, characterized in that, The toe plate has a protrusion on its bottom surface away from the retaining wall, and the protrusion is positioned opposite to the retaining wall.
6. The maintenance structure for bridge foundations on widened embankment slopes according to claim 3, characterized in that, The thickness of the retaining wall gradually decreases in the direction away from the toe plate.
7. The maintenance structure for bridge foundations on widened embankment slopes according to claim 3, characterized in that, The sidewall of the variable-height retaining wall is flush with the sidewall of the toe plate.
8. The maintenance structure for bridge foundations on widened embankment slopes according to claim 7, characterized in that, The toe plate extends beyond the variable-height retaining wall in a direction close to the bridge foundation.
9. The maintenance structure for bridge foundations on widened embankment slopes according to claim 3, characterized in that, The end face of the variable height retaining wall is provided with an installation groove, and the steel sheet pile is inserted into the installation groove for fixation.
10. The maintenance structure for bridge foundations on widened embankment slopes according to claim 1, characterized in that, After the sheet pile is pulled out, concrete is injected into the hole formed by the sheet pile.