A sand silt abutment, culvert abutment back roadbed cavity disease remediation structure
By applying vibration damping pads, grouting bodies, inclined drainage holes, and steel pipe composite pile curtains to the silty sand subgrade, the recurring problem of void defects at bridge abutments and culvert abutments was solved, thereby improving the stability and safety of the subgrade.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY SHANGHAI DESIGN INST GRP CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, the voids at bridge abutments and culvert abutments of silty sand roadbeds are difficult to cure completely and are prone to recurrence. There is a lack of systematic remediation solutions, which leads to potential safety hazards for the railway lines.
The project employs vibration damping structures, silty sand particle treatment structures, roadbed abutment water accumulation treatment structures, and runoff channel treatment structures, including vibration damping pads, grouting bodies, inclined drainage holes, and steel pipe composite pile curtains, which are used to buffer vibration, reinforce soil, drain water, and close runoff channels, respectively.
Effectively prevent and treat cavities in silty sand subgrade, improve subgrade structural performance, and ensure safety and construction efficiency.
Smart Images
Figure CN224531353U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of roadbed treatment technology, and in particular to a structure for treating voids in the roadbed behind sandy soil bridge abutments and culvert abutments. Background Technology
[0002] Railway and highway subgrades constructed with silty soil and sand are a common type of subgrade widely distributed in plains areas. Under dynamic loads from the superstructure, the silty sand in the subgrade is prone to liquefaction and loss, leading to cavities within the subgrade. Cavities at bridge abutments and culvert abutments are a significant problem in silty sand subgrades. These cavities can cause sudden track collapses, posing a serious threat to train and vehicle safety. The formation mechanism of cavities in silty sand subgrades at bridge abutments and culvert abutments is complex, and currently, there is no cure for silty sand subgrade problems. Even after remediation, the problems often recur, and a systematic remediation plan is lacking. Summary of the Invention
[0003] The purpose of this utility model is to address the shortcomings of the existing technology by providing a structure for treating voids in the roadbed behind sandy soil bridge abutments and culvert abutments. Through the combined application of multiple treatment structures, the prevention and treatment of voids in the roadbed behind sandy soil bridge abutments and culvert abutments can be achieved.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A structure for treating cavities in the roadbed behind bridge abutments and culvert abutments made of sandy soil is disclosed for treating cavities in existing roadbeds. The structure comprises a vibration-damping structure, a silty sand particle treatment structure, a roadbed abutment water accumulation treatment structure, and a runoff channel treatment structure, wherein:
[0006] The vibration reduction and treatment structure includes vibration damping pads installed under the ballast, the vibration damping pads covering the arrangement range of the ballast on the existing roadbed;
[0007] The silty soil particle treatment structure includes several grouting bodies within the existing roadbed, and the grouting bodies cover the void area.
[0008] The roadbed abutment backwater treatment structure includes an inclined drainage hole set at the abutment back position, the inclined drainage hole being arranged downwardly from the center of the existing roadbed in the outward direction.
[0009] The drainage channel improvement structure includes a curtain composed of several interlocking steel pipe composite piles, which is set on the slopes on both sides of the existing roadbed.
[0010] The vibration damping pad covers the top surface of the existing roadbed as a waterproof layer.
[0011] The grouting body is formed by grouting through a perforated pipe, and the grouting body is arranged downwards from the outside of the existing roadbed inwards.
[0012] The inclined drainage hole is equipped with an internally supported drainage pipe, which includes a pipe body with a drainage channel inside and a permeable geotextile wrapped around the outside of the pipe body.
[0013] The steel pipe composite pile includes an outer cement-soil mixing pile and a core pile set inside it, wherein the core pile is a steel pipe concrete core pile.
[0014] The advantages of this utility model are: it can prevent and treat cavities in silty sand roadbeds, ensuring the structural performance of silty sand roadbeds; the structure is simple and reasonable, construction is convenient and efficient, and it is suitable for promotion. Attached Figure Description
[0015] Figure 1 This is a structural schematic diagram of the vibration reduction and treatment measures in this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of the silty soil particle treatment measure in this utility model;
[0017] Figure 3 This is a structural schematic diagram of the water accumulation control measures behind the roadbed in this utility model;
[0018] Figure 4 This is a cross-sectional view of the internally supported drainage pipe in this utility model;
[0019] Figure 5 This is a structural elevation view of the loss channel remediation measures in this utility model;
[0020] Figure 6 for Figure 5 Floor plan. Detailed Implementation
[0021] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:
[0022] like Figure 1-6 As shown in the figure, 1-8 represent: vibration damping pad 1, grouting body 2, inclined drainage hole 3, internal support drainage pipe 4, drainage channel 5, borehole wall 6, permeable geotextile 7, and curtain 8, respectively.
[0023] Example: Figures 1 to 6 As shown in this embodiment, the structure for treating voids in the backfill of silty sand bridge abutments and culvert abutments includes the following structure:
[0024] 1) Vibration reduction structure:
[0025] (1) Vibration damping pads 1 are laid under the ballast at the top of bridge abutments and culverts (especially culverts with thin soil cover) to reduce the vibration transmitted from trains to bridge abutments and culverts. By setting vibration damping pads 1, the problem of large instantaneous deformation differences between the bridge and the road when trains pass can be buffered, and the vibration at the junction of bridge abutments / culverts and roadbeds caused by the impact of train wheels on bridge abutments / culverts is greater than that of general roadbeds or bridges.
[0026] In this embodiment, the vibration damping pad 1 on the existing roadbed is appropriately widened, preferably it can be laid flat on the surface of the existing roadbed, which also serves as a waterproof layer for the existing roadbed; in this way, water can be prevented from entering the existing roadbed.
[0027] (2) Increase the overall stiffness of the track between bridges and culverts:
[0028] Auxiliary rails and sleepers can be added at the transition points between bridges and culverts to improve the overall stiffness of the track in the transition section and reduce vibrations caused by stiffness differences between the bridges and culverts.
[0029] 2) Measures for the treatment of silty soil particles:
[0030] Grouting is performed on the back soil of the abutment to form grout body 2, thereby improving the shear resistance of the back soil. In this embodiment, grouting is carried out using perforated pipes. Based on the estimated propagation distance of vibration in the subgrade soil, the grouting range is within 5m behind the abutment. Two rows of grouting holes are considered to be set up. If there are cavities behind the abutment, the cavity range will be covered. The main consideration for grouting is to use perforated pipes to grout the silty soil in the area closest to the structural wall and most affected by vibration, thereby increasing the shear resistance of the silty soil and its ability to resist vibration liquefaction.
[0031] 3) Measures to control water accumulation behind roadbed abutments:
[0032] Drainage facilities are installed on the back of the platform to promptly drain rainwater that infiltrates during rainfall, preventing the silt soil from becoming saturated and liquefied. The drainage system employs inclined drainage holes 3 drilled into the back of the platform; these holes are installed at 0.3m and 3.3m distances from the back of the platform, with a vertical spacing of 2m. Internally supported drainage pipes 4 are installed within each inclined drainage hole 3. Figure 4 As shown, the internal support drainage pipe 4 has a drainage channel inside, and its outer surface is wrapped with a permeable geotextile 7. The permeable geotextile 7 is permeable to water but not to sand. Water can enter the drainage channel 5 of the internal support drainage pipe 4 from the borehole wall 6 through the permeable geotextile 7 and then be discharged.
[0033] In this embodiment, a small inclined hole drilling rig is used to drill a hole at the back of the platform, and then an internal support drainage pipe 4 is placed. The internal support drainage pipe 4 can drain the rainwater seepage from the back of the platform in a timely manner, and prevent the silt soil from becoming saturated and liquefied.
[0034] 4) Measures to address channel leakage:
[0035] Curtains were installed on the slopes of the roadbed on both sides to seal the runoff channels and prevent the silty sand from liquefying and flowing away through them. For ease of construction, the water-resistant curtain was designed using low-profile steel pipe composite piles. The composite piles had an outer diameter of 0.6m and an inner diameter of 150*6mm steel pipes, with a longitudinal spacing of 0.5m and an overlap of 0.1m to form the curtain. The composite pile construction equipment was characterized by its small size, minimal disturbance, and high speed, making it suitable for adjacent construction sites.
[0036] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.
Claims
1. A structure for treating cavities in the backfill of bridge abutments and culvert abutments made of sandy soil, used to treat cavities in existing roadbeds, characterized in that: The treatment structure for this disease includes vibration reduction structure, silty sand particle treatment structure, roadbed abutment backwater water accumulation treatment structure, and runoff channel treatment structure, among which: The vibration reduction and treatment structure includes vibration damping pads installed under the ballast, the vibration damping pads covering the arrangement range of the ballast on the existing roadbed; The silty soil particle treatment structure includes several grouting bodies within the existing roadbed, and the grouting bodies cover the void area. The roadbed abutment backwater treatment structure includes an inclined drainage hole set at the abutment back position, the inclined drainage hole being arranged downwardly from the center of the existing roadbed in the outward direction. The drainage channel improvement structure includes a curtain composed of several interlocking steel pipe composite piles, which is set on the slopes on both sides of the existing roadbed.
2. The structure for treating voids in the backfill of bridge abutments and culvert abutments in sandy soil as described in claim 1, characterized in that: The vibration damping pad covers the top surface of the existing roadbed as a waterproof layer.
3. The structure for treating voids in the backfill of bridge abutments and culvert abutments in sandy soil as described in claim 1, characterized in that: The grouting body is formed by grouting through a perforated pipe, and the grouting body is arranged downwards from the outside of the existing roadbed inwards.
4. The structure for treating voids in the backfill of bridge abutments and culvert abutments in sandy soil as described in claim 1, characterized in that: The inclined drainage hole is equipped with an internally supported drainage pipe, which includes a pipe body with a drainage channel inside and a permeable geotextile wrapped around the outside of the pipe body.
5. The structure for treating voids in the backfill of bridge abutments and culvert abutments in sandy soil as described in claim 1, characterized in that: The steel pipe composite pile includes an outer cement-soil mixing pile and a core pile set inside it, wherein the core pile is a steel pipe concrete core pile.