Supporting structure of channel protection road widening embankment above box culvert and construction method

Abstract

The invention discloses a supporting structure of a channel protection road widening embankment above a box culvert and a construction method. The supporting structure comprises a toe protection wall and a slope toe drainage ditch which are arranged at the top of the existing box culvert, rough surface steps excavated on the current slope surface, anti-sliding long anchor rods and reinforcing short anchor rods which are arranged in the widening embankment, and a reinforced concrete frame beam arranged on the slope surface of the widening embankment. Through combination of the anti-slip long anchor rods, the reinforcing short anchor rods, the reinforced concrete sash beams, the rough surface steps, the toe protection walls and the slope toe drainage ditches, normal passing of an existing road and safe operation of the slope toe drainage box culvert in the construction process are guaranteed, and the backfilling quality of the widening road embankment and the safety and stability of the widening road embankment slope are guaranteed; and the construction efficiency of an embankment widening project is improved.

Description

Technical Field

[0001] The invention relates to the technical field of support structure construction, and in particular to a support structure and a construction method for an embankment for ensuring a wide road above a box culvert. Background Art

[0002] During the operation of a highway, the number of vehicles passing through the road will continue to increase, and the highway will gradually fail to meet the functional needs. At this time, the highway needs to be upgraded and rebuilt. One of the reconstruction methods is to widen the roadbed, also known as widening. In the process of modern transportation infrastructure construction and renovation and upgrading, it is often faced with the situation that the existing road needs to widen the embankment under the condition of ensuring traffic. When there is an existing box culvert at the foot of the existing road as an important underground drainage channel, it will be more difficult and complicated to widen the embankment above it. On the one hand, under the condition of ensuring the traffic of the existing road, the working surface of the widening embankment is greatly compressed, large machinery is difficult to use, the construction personnel are restricted, and the construction efficiency is greatly reduced; on the other hand, the excessive disturbance and vibration caused by the construction is very likely to endanger the stability of the roadbed of the existing road, destroy the structure of the box culvert at the foot of the slope, and then affect the normal operation of the entire transportation network and drainage system. Therefore, the widening embankment cannot be compacted and backfilled by conventional heavy rollers, and traditional roadbed backfilling and support methods are difficult to take into account the requirements of construction safety, quality and traffic. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems and to provide a supporting structure and construction method for a road widening embankment above a box culvert, which can not only meet the backfill quality of the road widening embankment and the safety and stability of the slope of the road widening embankment, but also ensure the normal passage of existing roads and the safe operation of the slope foot drainage box culvert during the construction process. The construction is convenient and solves the problem that the road widening embankment above the existing box culvert cannot be backfilled and compacted by conventional means.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A supporting structure for a widening embankment of a road above a box culvert, comprising a retaining wall and a slope foot drainage ditch arranged on the top of an existing box culvert, a rough-surface step excavated on the existing slope, long anti-slip anchor rods and reinforced short anchor rods arranged in the widening embankment, and reinforced concrete lattice beams arranged on the slope surface of the widening embankment, wherein the widening embankment is located above the existing box culvert, and the widening embankment covers the rough-surface step; the existing slope is located on one side of an existing road for maintaining traffic, and the existing road for maintaining traffic is an existing road that needs to ensure traffic conditions, and the side of the widening embankment away from the rough-surface step is set as the widening embankment slope; the long anti-slip anchor rods are arranged in an array, and the reinforced short anchor rods are set between adjacent long anti-slip anchor rods.

[0006] Furthermore, the height of each step of the rough surface step is 0.8 to 1.0 m, the anti-slip long anchor rod penetrates into the existing slope surface by not less than 5 m, and the reinforced short anchor rod penetrates into the existing slope surface by not less than 1.5 m.

[0007] Furthermore, the guardrail is a reinforced concrete structure with dimensions of 0.5m in width and 1.0m in height. The guardrail is connected to the existing box culvert top plate by roughening the surface and embedding reinforcement. A φ100mm guardrail drainage hole is arranged in the guardrail. The guardrail drainage hole is 0.5m away from the bottom of the guardrail, with a longitudinal spacing of 3.0m and a downward slope of 5% outside the wall. The net dimensions of the slope foot drainage ditch are 0.4m in width and 0.4m in height. The side walls of the slope foot drainage ditch are composed of the guardrail close to the embankment and the drainage ditch side walls away from the embankment. The drainage ditch side walls are plain concrete structures with dimensions of 0.1m in width and 0.4m in height.

[0008] Furthermore, the rough surface step is excavated manually, the outer vertex of the rough surface step coincides with the existing slope, and the widening embankment is constructed by layered backfilling and light compaction. The layered backfilling and compaction thickness is the same as the height of each step of the rough surface step, and the compaction coefficient of the widening embankment is not less than 0.90.

[0009] Furthermore, the anti-slip long anchor rods adopt φ108×4.2mm steel flower tubes, the longitudinal and transverse spacing of the anti-slip long anchor rods is between 2.0 and 3.0m, the vertical distance between the top row of anti-slip long anchor rods and the top of the slope of the embankment is not less than 1.5m, the vertical distance between the bottom row of anti-slip long anchor rods and the top of the footing wall is 0.5m, and the inclination angle θ of the anti-slip long anchor rods is 10 to 20°.

[0010] Furthermore, the reinforced short anchor rod adopts φ42×3.25mm steel flower tube, and the longitudinal and transverse spacing of the reinforced short anchor rod is half of the longitudinal and transverse spacing of the anti-slip long anchor rod. The reinforced short anchor rod is arranged in the middle of the anti-slip long anchor rod, and the inclination angle of the reinforced short anchor rod is the same as the inclination angle of the anti-slip long anchor rod.

[0011] Furthermore, the reinforced concrete frame beam is composed of horizontal and vertical crossed beams and longitudinal beams, the vertical spacing of the horizontal beams is consistent with the vertical spacing of the long anti-sliding anchor rods, the transverse spacing of the longitudinal beams is consistent with the transverse spacing of the long anti-sliding anchor rods, the reinforced concrete frame beam is connected to the long anti-sliding anchor rods, the long anti-sliding anchor rods are anchored 150mm into the reinforced concrete frame beam, and a steel end plate is arranged at the end of the long anti-sliding anchor rod, and the dimensions of the steel end plate are 200mm long, 200mm wide and 6mm thick.

[0012] Furthermore, the slope surface of the wide embankment is arranged with φ100mm slope drainage holes, the vertical and horizontal spacing of the slope drainage holes is the same as the vertical and horizontal spacing of the anti-sliding long anchor rods, the depth of the slope drainage holes is 3.0m, and the slope outward is 5%.

[0013] Furthermore, the wall of the steel flower pipe is provided with φ6mm grouting holes, the longitudinal spacing of the grouting holes along the steel flower pipe is 0.2m, and 4 grouting holes are arranged at equal intervals in each section.

[0014] The present invention also provides a construction method for a supporting structure of a road embankment for ensuring a wide road above a box culvert, which is used to construct the supporting structure of a road embankment for ensuring a wide road above a box culvert, and comprises the following steps:

[0015] Step 1): construct the footing wall and the slope foot drainage ditch;

[0016] Step 2): along the existing slope, artificially excavate rough surface steps;

[0017] Step 3): backfill in layers and lightly compact the backfill soil of the widened embankment, and the height of each backfill layer is consistent with the height of each step of the rough surface step;

[0018] Step 4): construct the anti-slip long anchor rods in layers from bottom to top and perform grouting;

[0019] Step 5): construct the reinforced short anchor rods in layers from top to bottom and perform grouting;

[0020] Step 6): construct reinforced concrete frame beams along the existing slope and connect them with anti-sliding long anchor rods;

[0021] Step 7): construct the slope drainage holes, construct slope greening and help widen the road surface, and after the maintenance is completed, the road widening is formed and the construction is completed.

[0022] The present invention provides a supporting structure and construction method for a road widening embankment for ensuring passage above a box culvert, which have the following beneficial effects: through the combination of anti-slip long anchor rods, reinforced short anchor rods, reinforced concrete lattice beams, roughened steps, toe walls and slope foot drainage ditches, it effectively solves the problem that it is difficult to take into account the construction safety, quality and passage requirements when using conventional roadbed backfilling and support means for the road widening embankment for ensuring passage above an existing box culvert, ensures the normal passage of existing roads and the safe operation of the slope foot drainage box culvert during the construction process, ensures the backfill quality of the road widening embankment and the safety and stability of the slope of the road widening embankment, and improves the construction efficiency of the road widening embankment project. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings:

[0024] Figure 1 A schematic diagram of the cross-sectional structure of a supporting structure for ensuring a wide embankment on a road side above a box culvert provided by the present invention.

[0025] Figure 2 A schematic elevation diagram of the slope surface of a supporting structure for ensuring a wide road bank above a box culvert provided by the present invention.

[0026] Figure 3 It is a plan view of a steel flower tube in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the cross section of the steel flower tube in the embodiment of the present invention.

[0028] Figure 5 It is a schematic cross-sectional view of the connection between the anti-slip steel flower tube and the reinforced concrete lattice beam in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of step 1) and step 2) of the construction method of an embodiment of the present invention.

[0030] Figure 7 Schematic diagram of step 3) of the construction method of an embodiment of the present invention.

[0031] Figure 8 Schematic diagram of step 4) of the construction method of an embodiment of the present invention.

[0032] Fig. 9 Schematic diagram of step 5) of the construction method of an embodiment of the present invention.

[0033] Fig.10 Schematic diagram of step 6) of the construction method of an embodiment of the present invention.

[0034] Fig.11 Schematic diagram of step 7) of the construction method of an embodiment of the present invention.

[0035] Explanation of the numbers in the figure: 1. Existing box culvert; 2. Existing slope; 3. Guard wall; 31. Guard wall drainage hole; 4. Drainage ditch at the foot of the slope; 41. Drainage ditch side wall; 5. Rough step; 6. Widening embankment; 7. Widening embankment slope; 8. Anti-slip long anchor rod; 9. Reinforced short anchor rod; 10. Reinforced concrete frame beam; 101. Cross beam; 102. Longitudinal beam; 11. Slope drainage hole; 12. Steel flower pipe; 13. Grouting hole; 14. Steel end plate. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0039] like Figure 1-Figure 5 As shown, a supporting structure for a widening embankment of a road above a box culvert is provided, comprising a retaining wall 3 and a slope foot drainage ditch 4 arranged on the top of an existing box culvert 1, a rough surface step 5 excavated on an existing slope 2, anti-slip long anchor rods 8 and reinforced short anchor rods 9 arranged in the widening embankment 6, and a reinforced concrete frame beam 10 arranged on the widening embankment slope 7, wherein the widening embankment 6 is located above the existing box culvert 1, and the widening embankment 6 covers the rough surface step 5; the existing slope 2 is located on one side of the existing road for maintaining traffic, and the existing road for maintaining traffic is an existing road that needs to ensure traffic conditions, and the side of the widening embankment 6 away from the rough surface step 5 is set as the widening embankment slope 7; the anti-slip long anchor rods 8 are arranged in an array, and the reinforced short anchor rods 9 are set between adjacent anti-slip long anchor rods 8.

[0040] The present invention adopts the above-mentioned technical scheme, and through the combination of anti-slip long anchor rods 8, reinforced short anchor rods 9, reinforced concrete frame beams 10, rough surface steps 5, toe walls 3 and slope foot drainage ditches 4, effectively solves the problem that it is difficult to take into account the construction safety, quality and traffic requirements when using conventional roadbed backfilling and support methods for the widening embankment of the road above the existing box culvert. The slope foot drainage ditch 4 guides the water in the slope soil and discharges it outside the embankment, avoiding water erosion and softening of the slope soil, ensuring the normal passage of the existing road and the safe operation of the slope foot drainage box culvert during the construction process, ensuring the backfill quality of the widening road embankment and the safety and stability of the slope of the widening embankment, and improving the construction efficiency of the widening embankment project.

[0041] Specifically, the height of each step of the rough surface step 5 is 0.8-1.0m, the anti-slip long anchor rod 8 penetrates into the existing slope surface 2 by no less than 5m, and the reinforced short anchor rod 9 penetrates into the existing slope surface 2 by no less than 1.5m. Through the above arrangement, the overall stability of the widening embankment 6 is effectively enhanced to prevent slope sliding; the rough surface step 5 increases the friction of the road surface to ensure the safe passage of vehicles.

[0042] Specifically, the footing wall 3 is a reinforced concrete structure with dimensions of 0.5m in width and 1.0m in height. The footing wall 3 is connected to the top plate of the existing box culvert 1 by roughening the surface and embedding reinforcement. A φ100mm footing wall drainage hole 31 is arranged in the footing wall 3. The footing wall drainage hole 31 is 0.5m away from the bottom end of the footing wall 3, and the longitudinal spacing of the footing wall drainage holes 31 is 3.0m, with a downward slope of 5% outside the wall; the net dimensions of the slope foot drainage ditch 4 are 0.4m in width and 0.4m in height. The side walls of the slope foot drainage ditch 4 are composed of the footing wall 3 close to the embankment and the drainage ditch side walls 41 away from the embankment. The drainage ditch side walls 41 are plain concrete structures with dimensions of 0.1m in width and 0.4m in height. By adopting a reinforced concrete toe wall 3 and connecting it to the top plate of the existing box culvert 1, the stability of the toe of the slope of the widening embankment 6 can be ensured. By setting a toe wall drainage hole 31 in the toe wall 3, the water in the slope soil is introduced into the toe drainage ditch 4, which can lower the groundwater level in the slope of the widening embankment 6 and enhance the stability of the slope.

[0043] Specifically, the rough surface step 5 is excavated manually, and the outer vertex of the rough surface step 5 coincides with the existing slope 2. The widening embankment 6 is constructed by layered backfilling and light compaction. The layered backfilling and compaction thickness is the same as the height of each step of the rough surface step 5, and the compaction coefficient of the widening embankment 6 is not less than 0.90. By setting the rough surface step 5, the friction between the new and old overlapping surfaces of the widening embankment 6 and the existing slope 2 can be effectively increased to prevent the slope from sliding along the new and old overlapping surfaces. The use of manual excavation can effectively reduce the disturbance of the construction to the existing road maintenance. By layered backfilling and light compaction of the widening embankment 6, the compaction quality of the widening embankment 6 can be improved under the condition of reducing the disturbance of the construction to the existing road maintenance, and the basic stability of the slope of the widening embankment 6 during the construction process can be ensured.

[0044] Specifically, the anti-slip long anchor rod 8 is made of a φ108×4.2 mm steel flower tube 12. Figure 2 As shown, the longitudinal spacing H and the transverse spacing L of the anti-slip long anchor rods 8 are both set to between 2.0 and 3.0 m, the vertical distance between the top row of anti-slip long anchor rods 8 and the top of the slope 7 of the embankment width is not less than 1.5 m, the vertical distance between the bottom row of anti-slip long anchor rods 8 and the top of the footing wall 3 is 0.5 m, and the inclination angle θ of the anti-slip long anchor rods 8 is 10 to 20°. By adopting φ108×4.2mm steel flower tube 12, the material resistance required for slope anti-slip can be effectively provided, and grouting is convenient. By leaving a vertical distance between the top row of anti-slip long anchor rods 8 and the top of the slope, the soil covering thickness of the top row of anti-slip long anchor rods 8 can be guaranteed, so that the top row of anti-slip long anchor rods 8 can fully play the anchoring role. By leaving a vertical distance between the bottom row of anti-slip long anchor rods 8 and the top of the footing wall 3, the construction process can avoid affecting the footing wall 3. By setting a certain inclination angle downward for the anti-slip long anchor rods 8, the anchor rod and grouting construction can be convenient.

[0045] Specifically, the reinforced short anchor rod 9 adopts a φ42×3.25mm steel flower tube 12, such as Figure 2 As shown, the vertical and horizontal spacing of the reinforcement short anchor rods 9 is half of the vertical and horizontal spacing of the anti-sliding long anchor rods 8. The reinforcement short anchor rods 9 are arranged in the middle of the anti-sliding long anchor rods 8, and the inclination angle of the reinforcement short anchor rods 9 is the same as the inclination angle of the anti-sliding long anchor rods 8. By adopting the φ42×3.25mm steel flower tube 12, the cost can be saved, the grouting reinforcement of the soil of the widening embankment 6 is convenient, and a certain reinforcement effect is played. By arranging the reinforcement short anchor rods 9 in the middle of the anti-sliding long anchor rods 8 and adopting the same inclination angle as the anti-sliding long anchor rods 8, the anchor rod and grouting construction can be facilitated, and the uniformity of the grouting reinforcement in the widening embankment 6 can also be ensured.

[0046] Specifically, the reinforced concrete lattice beam 10 is composed of a horizontal and vertical cross beam 101 and a longitudinal beam 102, the vertical spacing of the horizontal beam 101 is consistent with the vertical spacing of the anti-sliding long anchor rod 8, the transverse spacing of the longitudinal beam 102 is consistent with the transverse spacing of the anti-sliding long anchor rod 8, and the reinforced concrete lattice beam 10 is connected to the anti-sliding long anchor rod 8, such as Figure 5 As shown, the anti-sliding long anchor rod 8 is anchored into the reinforced concrete frame beam 10 by 150 mm, and a steel end plate 14 is arranged at the end of the anti-sliding long anchor rod 8, and the size of the steel end plate 14 is 200 mm long, 200 mm wide, and 6 mm thick. By arranging the reinforced concrete frame beam 10 and connecting it with the anti-sliding long anchor rod 8, the anti-sliding long anchor rod 8 can be subjected to an integral force, and the safety and stability of the slope of the embankment 6 can be ensured by working together. By arranging the steel end plate 14 at the end of the anti-sliding long anchor rod 8 and anchoring it into the reinforced concrete frame beam 10, the effective connection between the anti-sliding long anchor rod 8 and the reinforced concrete frame beam 10 can be ensured.

[0047] Specifically, the slope surface 7 of the widening embankment is provided with φ100mm slope drainage holes 11, the vertical and horizontal spacing of the slope drainage holes 11 is the same as the vertical and horizontal spacing of the anti-sliding long anchor rods 8, the slope drainage holes 11 are 3.0m deep, and the slope outward is 5%. By arranging the slope drainage holes 11 at vertical and horizontal intervals, the groundwater in the soil body of the slope of the widening embankment 6 can be discharged in time to prevent the soil body from softening and ensure the stability of the slope of the widening embankment 6.

[0048] Specifically, the wall of the steel flower tube 12 is provided with φ6mm grouting holes 13, and the axial spacing of the grouting holes 13 along the steel flower tube 12 is 0.2m. Figure 4 As shown, four grouting holes 13 are arranged at equal intervals in each section. By arranging the grouting holes 13 at equal intervals along the longitudinal direction and cross section of the steel flower tube 12, the uniformity of grouting in the soil of the embankment 6 can be ensured, and the overall strength of the steel flower tube 12 can also be ensured.

[0049] like Figures 6 to 11As shown, the present invention also provides a construction method for a supporting structure for the above-mentioned existing box culvert to ensure the width of the road embankment, comprising the following steps:

[0050] Step 1): Figure 6 As shown, the foot protection wall 3 and the slope foot drainage ditch 4 are constructed;

[0051] Step 2): along the existing slope 2, artificially excavate a rough surface step 5;

[0052] Step 3): Figure 7 As shown, the backfill soil of the widening embankment 6 is backfilled in layers and lightly compacted, and the backfill height of each layer is consistent with the height of each step of the rough surface step 5;

[0053] Step 4): Figure 8 As shown, the anti-sliding long anchor rods 8 are constructed layer by layer from bottom to top and grouting is performed;

[0054] Step 5): Fig. 9 As shown, the reinforced short anchor rods 9 are constructed layer by layer from top to bottom and grouting is performed;

[0055] Step 6): Fig.10 As shown, a reinforced concrete frame beam 10 is constructed along the existing slope 2 and connected with the anti-sliding long anchor rod 8;

[0056] Step 7): construct the slope drainage hole 11; Fig.11 As shown, the slope greening and road widening pavement construction, after maintenance is completed, the road widening journey is completed.

[0057] The parts not involved in this technical solution can be implemented by using existing technologies.

[0058] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected includes the attached claims and their equivalents.

Claims

1. A supporting structure for ensuring the width of the road embankment above a box culvert, characterized in that: The invention comprises a footing wall (3) and a slope foot drainage ditch (4) arranged on the top of an existing box culvert (1), a rough surface step (5) excavated on an existing slope surface (2), an anti-sliding long anchor rod (8) and a reinforcing short anchor rod (9) arranged in a widening embankment (6), and a reinforced concrete frame beam (10) arranged on the widening embankment slope surface (7), wherein the widening embankment (6) is located above the existing box culvert (1), and the widening embankment (6) covers the rough surface step (5); the existing slope surface (2) is located on one side of an existing road for ensuring traffic, and the existing road for ensuring traffic is an existing road for which traffic conditions need to be ensured, and the side of the widening embankment (6) away from the rough surface step (5) is set as the widening embankment slope surface (7); the anti-sliding long anchor rods (8) are arranged in an array, and the reinforcing short anchor rods (9) are arranged between adjacent anti-sliding long anchor rods (8).

2. A supporting structure for ensuring the width of the road embankment above a box culvert according to claim 1, characterized in that: The height of each step of the rough surface step (5) is 0.8-1.0 m, the anti-slip long anchor rod (8) penetrates into the existing slope surface (2) by not less than 5 m, and the reinforced short anchor rod (9) penetrates into the existing slope surface (2) by not less than 1.5 m.

3. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 1 is characterized by: The footing wall (3) is a reinforced concrete structure. The footing wall (3) has a size of 0.5 m in width and 1.0 m in height. The footing wall (3) is connected to the top plate of the existing box culvert (1) by roughening the surface and embedding reinforcement. A φ100 mm footing wall drainage hole (31) is arranged in the footing wall (3). The footing wall drainage hole (31) is 0.5 m away from the bottom end of the footing wall (3), with a longitudinal spacing of 3.0 m and a downward slope of 5% toward the outside of the wall. The net size of the slope foot drainage ditch (4) is 0.4 m in width and 0.4 m in height. The side wall of the slope foot drainage ditch (4) is composed of the footing wall (3) close to the embankment and the drainage ditch side wall (41) away from the embankment. The drainage ditch side wall (41) is a plain concrete structure with a size of 0.1 m in width and 0.4 m in height.

4. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 1 is characterized by: The rough surface step (5) is excavated manually, and the outer vertex of the rough surface step (5) coincides with the existing slope (2). The widening embankment (6) is constructed by layered backfilling and light compaction. The layered backfilling and compaction thickness is the same as the height of each step of the rough surface step (5). The compaction coefficient of the widening embankment (6) is not less than 0.

90.

5. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 1 is characterized by: The anti-slip long anchor rods (8) are made of φ108×4.2mm steel flower tubes (12), the longitudinal and transverse spacing of the anti-slip long anchor rods (8) is between 2.0 and 3.0m, the vertical distance between the top row of anti-slip long anchor rods (8) and the top of the slope surface (7) of the embankment width is not less than 1.5m, the vertical distance between the bottom row of anti-slip long anchor rods (8) and the top of the footing wall (3) is 0.5m, and the inclination angle θ of the anti-slip long anchor rods (8) is 10 to 20°.

6. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 5 is characterized by: The reinforcing short anchor rod (9) adopts a φ42×3.25mm steel flower tube (12), and the longitudinal and transverse spacing of the reinforcing short anchor rod (9) is half of the longitudinal and transverse spacing of the anti-slip long anchor rod (8). The reinforcing short anchor rod (9) is arranged in the middle of the anti-slip long anchor rod (8), and the inclination angle of the reinforcing short anchor rod (9) is the same as the inclination angle of the anti-slip long anchor rod (8).

7. A supporting structure for ensuring the width of the road embankment above a box culvert according to claim 6, characterized in that: The reinforced concrete lattice beam (10) is composed of a cross beam (101) and a longitudinal beam (102). The vertical spacing of the cross beam (101) is consistent with the vertical spacing of the anti-sliding long anchor rods (8). The transverse spacing of the longitudinal beam (102) is consistent with the transverse spacing of the anti-sliding long anchor rods (8). The reinforced concrete lattice beam (10) is connected to the anti-sliding long anchor rods (8). The anti-sliding long anchor rods (8) are anchored into the reinforced concrete lattice beam (10) by 150 mm. A steel end plate (14) is provided at the end of the anti-sliding long anchor rod (8). The size of the steel end plate (14) is 200 mm in length, 200 mm in width and 6 mm in thickness.

8. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 6 is characterized by: The wide embankment slope (7) is provided with φ100mm slope drainage holes (11), the vertical and horizontal spacing of the slope drainage holes (11) is the same as the vertical and horizontal spacing of the anti-sliding long anchor rods (8), the slope drainage holes (11) are 3.0m deep, and the slope outward is 5%.

9. The supporting structure for ensuring the width of the road embankment above the box culvert according to claim 6 is characterized by: The steel flower tube (12) is provided with φ6 mm grouting holes (13) on its wall. The longitudinal spacing of the grouting holes (13) along the steel flower tube (12) is 0.2 m, and four grouting holes (13) are arranged at equal intervals on each section.

10. A method for constructing a supporting structure for a road embankment with a wide road bank above a box culvert, used for constructing a supporting structure for a road embankment with a wide road bank above a box culvert as claimed in claims 2 to 9, characterized in that: The steps include: Step 1): constructing the foot protection wall (3) and the slope foot drainage ditch (4); Step 2): along the existing slope (2), artificially excavating a rough surface step (5); Step 3): backfilling in layers and lightly compacting the backfill soil of the widening embankment (6), wherein the height of each backfill layer is consistent with the height of each step of the rough surface step (5); Step 4): constructing the anti-slip long anchor rod (8) in layers from bottom to top and grouting; Step 5): construct the reinforced short anchor rods (9) in layers from top to bottom and perform grouting; Step 6): constructing a reinforced concrete lattice beam (10) along the existing slope (2) and connecting it with the anti-sliding long anchor rod (8); Step 7): construct the slope drainage hole (11); green the slope and widen the road surface, and after the maintenance is completed, widen the road and the construction is completed.

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