Expanding and widening road structure and construction method

Abstract

The present invention discloses an expansion and widening road structure and a construction method, which belongs to the technical field of road construction. The expansion and widening road structure includes an original roadbed, which includes a first slope, a passage section, and a second slope, wherein the second slope is provided with a notch; at least a portion of a retaining wall is provided in the first slope, and the top of the retaining wall protrudes from the passage section; a concrete ditch is provided in the notch; a concrete roadbed is provided between the retaining wall and the concrete ditch, and the top of the concrete roadbed is flush with the top of the retaining wall and the top of the concrete ditch. The expansion and widening road structure designed according to the present invention realizes an increase in the width of the road after expansion. At the same time, the provision of the retaining wall and the concrete ditch can prevent soil and water loss between the retaining wall and the concrete ditch, and ensure the integrity of the soil between the retaining wall and the concrete ditch, thereby avoiding uneven load distribution in the original roadbed section and soil between the retaining wall and the concrete ditch, and avoiding settlement or cracks in the road structure.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction, and in particular relates to an expansion and widening road structure and a construction method. Background Art

[0002] In the related technology, many existing roads are located in complex terrain environments, such as hillsides, river valleys or densely populated areas, which brings great difficulty to road widening projects. In the existing technology, when widening roads in the above-mentioned areas, due to differences in soil properties or uneven load distribution, the road structure is prone to settlement or cracks. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to propose a road widening structure.

[0004] The present invention also provides a construction method suitable for the above-mentioned expanded and widened road structure.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an expanded and widened road structure, comprising: an original roadbed, the original roadbed comprising a first slope, a passage section and a second slope arranged in sequence in the width direction, the first slope gradually increasing in height in the direction toward the passage section, the second slope gradually increasing in height in the direction away from the passage section, the passage section being suitable for connecting the first slope with the second slope, the second slope being provided with a notch; a retaining wall, the retaining wall extending in the height direction and spaced apart from the passage section, at least a portion of the retaining wall being arranged in the first slope, the top of the retaining wall protruding from the passage section; a concrete ditch, the concrete ditch being arranged in the notch and spaced apart from the passage section, the top of the concrete ditch being flush with the top of the retaining wall; a concrete roadbed, the concrete roadbed being arranged between the retaining wall and the concrete ditch, the top of the concrete roadbed being flush with the top of the retaining wall and the top of the concrete ditch.

[0007] According to the expanded and widened road structure of the present invention, the width of the road after expansion is increased, which is beneficial to relieve traffic pressure and improve traffic flow. At the same time, the setting of the retaining wall and the concrete ditch can prevent soil erosion between the retaining wall and the concrete ditch, and ensure the integrity of the soil between the retaining wall and the concrete ditch, thereby avoiding uneven load distribution in the original roadbed section and soil between the retaining wall and the concrete ditch, and then avoiding settlement or cracks in the road structure, extending the service life of the road structure. Moreover, the combined use of the retaining wall and a good drainage system improves the safety factor of the road and reduces potential risk factors. At the same time, the above-mentioned concrete roadbed is completed by on-site casting, and the concrete roadbed realizes the connection of the retaining wall, concrete ditch and the original roadbed, so that the entire road structure can be connected as a whole, making the road structure more stable and having a longer service life.

[0008] Furthermore, the retaining wall includes: an embedded portion, which is arranged in the first slope; a wall portion, at least a part of which is arranged in the first slope, and the top of the wall portion is flush with the top of the concrete ditch.

[0009] Furthermore, the width of the wall portion gradually increases in a direction away from the embedded portion.

[0010] Furthermore, it also includes: filling construction slag, wherein the filling construction slag is arranged between the wall part and the passage section; a reinforcing stone layer, wherein the reinforcing stone layer is arranged above the filling construction slag, and the top of the reinforcing stone layer is flush with the top of the passage section; wherein the compaction degree of the reinforcing stone layer is P1, satisfying: P1≥0.95.

[0011] Furthermore, the first slope includes: a connecting section, one side of the connecting section in the width direction is connected to the passing section, and the height of the connecting section gradually decreases in the direction away from the passing section; a riverbed, the riverbed is located on the other side of the connecting section in the width direction and connected to the connecting section; wherein at least a portion of the retaining wall is arranged in the riverbed.

[0012] Furthermore, it also includes: connecting steel bars, at least part of which is located in the filling slag, one end of which is located in the reinforcing stone layer, and the other end of which is located in the wall part and / or the connecting section.

[0013] Furthermore, the groove includes a first section, a second section and a third section which are arranged in sequence in the width direction, the first section is arranged close to the passage section, the top of the first section is lower than the top of the passage section, the top of the second section is lower than the top of the first section, the third section gradually increases in height in the direction away from the passage section, and the bottom of the third section is higher than the top of the second section; wherein the concrete ditch is arranged in the second section, the road structure also includes: a reinforcing soil-stone layer, the reinforcing soil-stone layer is arranged in the first section, and the top of the reinforcing soil-stone layer is flush with the top of the passage section, and at least part of the reinforcing soil-stone layer is located in the concrete ditch.

[0014] Furthermore, the compaction degree of the first section is P2, which satisfies: P2≥0.85, and the compaction degree of the reinforced soil-stone layer is P3, which satisfies: P3≥0.95.

[0015] Furthermore, there is a gap between the top of the concrete ditch on one side away from the passage section and the third section.

[0016] The construction method according to the present invention is briefly described below.

[0017] The construction method of the present invention is applicable to the expanded and widened road structure described in any one of the above embodiments. The construction method according to the present invention includes: excavating a receiving groove on the first slope and excavating a missing groove on the second slope; disposing at least part of the retaining wall in the receiving groove, and disposing at least part of the concrete ditch in the missing groove; adjusting the top of the retaining wall and the top of the concrete ditch to be flush; filling concrete between the retaining wall and the concrete ditch, the top of the concrete is flush with the top of the retaining wall and the top of the concrete ditch, and the concrete forms the concrete roadbed after solidification.

[0018] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0020] Figure 1 is a schematic diagram of a road structure of the present invention;

[0021] Figure 2 It is a schematic diagram of excavation of the original roadbed of the present invention;

[0022] Figure 3 It is a schematic diagram of the construction method of the present invention.

[0023] The following are marked in the accompanying drawings:

[0024] 1. Road structure;

[0025] 11. first slope; 111. connecting section; 112. riverbed; 1121. receiving groove; 12. passage section; 13. second slope; 131. missing groove; 1311. first section; 1312. second section; 1313. third section;

[0026] 20. retaining wall; 21. embedded part; 22. wall part;

[0027] 30. Concrete ditch; 31. Gap; 40. Concrete roadbed;

[0028] 50. Fill with construction slag; 60. Reinforce the rubble layer; 70. Connect steel bars; 80. Reinforce the soil-stone layer. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary implementation modes of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0030] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0031] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] like Figure 1-Figure 3 As shown, the present invention provides a road widening structure 1, comprising: an original roadbed, a retaining wall 20, a concrete ditch 30 and a concrete roadbed 40, wherein the original roadbed comprises a first slope 11, a passage section 12 and a second slope 13 arranged in sequence in the width direction, wherein the first slope 11 gradually increases in height in the direction toward the passage section 12, and the second slope 13 gradually increases in height in the direction away from the passage section 12, and the passage section 12 is suitable for connecting the first slope 11 with the second slope 13, and the second slope 13 is provided with a gap Groove 131, the retaining wall 20 extends in the height direction and is spaced apart from the passage section 12, at least part of the retaining wall 20 is arranged in the first slope 11, the top of the retaining wall 20 protrudes from the passage section 12, the concrete ditch 30 is arranged in the groove 131 and is spaced apart from the passage section 12, the top of the concrete ditch 30 is flush with the top of the retaining wall 20, the concrete roadbed 40 is arranged between the retaining wall 20 and the concrete ditch 30, and the top of the concrete roadbed 40 is flush with the top of the retaining wall 20 and the top of the concrete ditch 30.

[0035] In some embodiments, the original roadbed refers to the original road foundation composed of a first slope 11, a passage section 12 and a second slope 13 in the width direction. The first slope 11 gradually rises on the side close to the passage section 12, and the second slope 13 gradually rises on the side away from the passage section 12. A notch 131 is provided in the second slope 13. The retaining wall 20 is a vertically extending structure. Part of the retaining wall 20 is embedded in the first slope 11, and the top of the retaining wall 20 is higher than the height of the passage section 12. The main function of the retaining wall 20 is to support the soil or other filling materials between the new and old roadbeds to prevent landslides or soil erosion. The concrete ditch 30 is located on the second slope 13. The concrete ditch 30 is in the gap 131, and a certain distance is maintained between the concrete ditch 30 and the passage section 12. The concrete ditch 30 is mainly used to collect and guide rainwater or surface water to flow out to avoid water accumulation and damage to the road. The top height of the ditch is consistent with the top of the retaining wall 20, ensuring the flatness of the road surface. The concrete roadbed 40 is filled between the retaining wall 20 and the concrete ditch 30, and the top of the concrete roadbed 40 is flush with the top of the concrete ditch 30 and the top of the retaining wall 20. Therefore, the road section between the concrete ditch 30 and the retaining wall 20 is all constructed as a new road surface (the road surface is suitable for vehicles or pedestrians to pass), thereby realizing the widening of the road surface on the basis of the original roadbed.

[0036] It can be understood that the original roadbed includes a first slope 11, a pass section 12 and a second slope 13, and a notch 131 is provided on the second slope 13. The above arrangement cleverly utilizes the existing terrain and ensures a smooth transition between the new and old sections by rationally planning the height changes of each part. The retaining wall 20 not only plays a supporting role, but also extends in the height direction and is spaced apart from the pass section 12. The design of the top of the retaining wall 20 protruding from the pass section 12 increases the stability and safety of the structure, while providing convenience for subsequent construction.

[0037] The concrete ditch 30 is set in the groove 131 of the second slope 13, and the concrete ditch 30 is kept at a certain distance from the passage section 12, which not only ensures the effectiveness of the drainage system, but also avoids the impact of the ditch on the passage section 12, thereby improving driving safety and comfort. By setting the groove 131 and installing the concrete ditch 30 on the second slope 13, the drainage problem of the expansion area is effectively solved, the damage of water accumulation to the road foundation is reduced, and the service life of the road is improved.

[0038] The provision of the concrete roadbed 40 ensures a seamless connection between the new and old roadbeds, enhances the bearing capacity and stability of the overall structure, and is better able to cope with vehicle loads and other external pressures.

[0039] It is worth noting that the above-mentioned retaining wall 20 and concrete ditch 30 can be prefabricated separately, and the concrete roadbed 40 can be cast on site, which greatly simplifies the construction process, improves construction efficiency, and reduces construction difficulty. Moreover, by requiring the tops of the retaining wall 20, concrete ditch 30 and concrete roadbed 40 to be flush, standardized construction is achieved, ensuring the flatness and aesthetics of the final road surface.

[0040] It is worth mentioning that in the actual construction process, waste materials such as construction slag can be used as fillers to achieve resource recycling and reduce the impact of construction waste on the environment.

[0041] In particular, the above design fully takes into account the application needs under different terrain conditions, especially for situations where there are natural slopes or low-lying areas, and has strong adaptability. Moreover, by adjusting the specific parameters of each part (such as height, width, etc.), it can be flexibly applied to different types of road expansion projects, reflecting high scalability and applicability.

[0042] According to the expanded and widened road structure 1 of the present invention, the width of the expanded road is increased, which is beneficial to relieve traffic pressure and improve traffic flow. At the same time, the setting of the retaining wall 20 and the concrete ditch 30 can prevent soil erosion between the retaining wall 20 and the concrete ditch 30, and ensure the integrity of the soil between the retaining wall 20 and the concrete ditch 30, thereby avoiding uneven load distribution in the original roadbed section and soil between the retaining wall 20 and the concrete ditch 30, and then avoiding settlement or cracks in the road structure 1, thereby extending the service life of the road structure 1. Moreover, the combined use of the retaining wall 20 and a good drainage system improves the safety factor of the road and reduces potential risk factors. At the same time, the above-mentioned concrete roadbed 40 is completed by on-site casting, and the concrete roadbed 40 realizes the connection of the retaining wall 20, the concrete ditch 30 and the original roadbed, so that the entire road structure 1 can be connected as a whole, so that the road structure 1 has better stability and a longer service life.

[0043] Embodiment 2:

[0044] In this embodiment, based on the first embodiment, the retaining wall 20 includes: an embedded portion 21 and a wall portion 22, the embedded portion 21 is arranged in the first slope 11, at least a portion of the wall portion 22 is arranged in the first slope 11, and the top of the wall portion 22 is flush with the top of the concrete ditch 30.

[0045] It can be understood that the embedded part 21 is embedded in the first slope 11. The main function of the embedded part 21 is to provide a stable foundation for the retaining wall 20, to ensure that the retaining wall 20 can effectively resist the pressure from above and the side, and to prevent displacement or collapse caused by soil pressure or external forces. At least a part of the wall part 22 is also arranged inside the first slope 11, and the top of the wall part 22 is flush with the top of the concrete ditch 30. The function of the wall part 22 is to continue to provide support and maintain the flatness of the road surface together with the concrete ditch 30. In addition, the design of the wall part 22 helps to disperse the pressure transmitted by vehicles and other loads, and ensure the stability and safety of the road structure 1.

[0046] As a result, the embedded portion 21 penetrates deep into the first slope 11, greatly enhancing the overall stability of the retaining wall 20, enabling the retaining wall 20 to better withstand lateral earth pressure and vertical loads, and reducing the risk of deformation of the retaining wall 20. Moreover, the design that the top of the wall portion 22 is flush with the top of the concrete ditch 30 ensures a seamless connection between the new and old roads after the expansion, and maintains the flatness of the road surface, which is crucial to driving safety. Of course, by embedding a portion of the wall portion 22 into the first slope 11, it is possible to effectively prevent wall cracking or damage caused by factors such as temperature changes and moisture penetration, thereby improving the durability of the entire retaining wall 20 and even the road structure 1. At the same time, the design that the top of the wall portion 22 is flush with the top of the concrete ditch 30 also helps to ensure the effectiveness of the drainage system and prevent water accumulation from damaging the road.

[0047] According to some embodiments of the present invention, the width of the wall portion 22 gradually increases in the direction away from the embedded portion 21. It can be understood that the design of the gradually increasing width of the wall portion 22 can better resist the lateral pressure from the soil inside the first slope 11. As the wall portion 22 becomes wider, the wall portion 22 provides a larger contact area and stronger friction, thereby effectively preventing sliding or overturning due to soil pressure. Moreover, the trapezoidal cross-section helps to more evenly distribute the passing vehicles and other vertical loads to the wall portion 22 and its foundation (embedded portion 21), reducing local stress concentration and improving the bearing capacity of the entire road structure 1.

[0048] Embodiment three:

[0049] In this embodiment, based on the second embodiment, the road structure 1 further includes: filling slag 50 and a reinforcing stone layer 60, wherein the filling slag 50 is arranged between the wall portion 22 and the passage section 12, and the reinforcing stone layer 60 is arranged above the filling slag 50, and the top of the reinforcing stone layer 60 is flush with the top of the passage section 12; wherein the compaction degree of the reinforcing stone layer 60 is P1, satisfying: P1≥0.95.

[0050] In some embodiments, the filling slag 50 is arranged between the wall portion 22 and the passage section 12. The filling slag 50 is used to fill the gap between the wall portion 22 and the passage section 12 to provide a relatively flat foundation for the reinforcing stone layer 60 above. The filling slag 50 can also improve the drainage performance of the area and reduce the impact of accumulated water on the road foundation.

[0051] It is worth mentioning that using construction slag as fill material is usually more economical than using other engineering materials while still being able to meet basic engineering needs.

[0052] The reinforcing slab layer 60 is laid on top of the filling slag 50, and the top of the reinforcing slab layer 60 is flush with the top of the passage section 12. The compaction degree P1 of the reinforcing slab layer 60 needs to meet P1 ≥ 0.95, that is, at least reach a standard compaction degree of 95%. The high-density compacted slab layer significantly enhances the bearing capacity and stability of the area, reduces the settlement or deformation caused by vehicle load, and ensures that the top of the reinforcing slab layer 60 is flush with the top of the passage section 12, maintains the flatness of the entire road surface, and ensures driving safety and comfort. Of course, high-quality compaction helps to improve the overall durability of the road structure 1 and reduce the maintenance frequency and cost of the road structure 1.

[0053] It can be understood that the filling slag 50 combined with the reinforcing stone layer 60 provides a solid support, enhances the connection strength between the wall portion 22 and the passage section 12, and prevents displacement or damage caused by external loads or natural factors. Moreover, the high compaction degree of the reinforcing stone layer 60 ensures good road surface quality and long-term performance, reduces the possibility of road surface cracks and other damage, and improves driving safety and comfort. At the same time, the rational use of construction slag for filling not only reduces material costs, but also simplifies the construction process and improves construction efficiency.

[0054] According to some embodiments of the present invention, the first slope 11 includes: a connecting section 111 and a riverbed 112, wherein one side of the connecting section 111 in the width direction is connected to the passing section 12, the height of the connecting section 111 gradually decreases in the direction away from the passing section 12, and the riverbed 112 is located on the other side of the connecting section 111 in the width direction and is connected to the connecting section 111; wherein at least a portion of the retaining wall 20 is arranged in the riverbed 112.

[0055] In some embodiments, the connecting section 111 is located on one side of the first slope 11, and the connecting section 111 is directly connected to the pass section 12. The height of the connecting section 111 gradually decreases in the direction away from the pass section 12. The function of the connecting section 111 is to provide a smooth transition from the pass section 12 to the first slope 11 for the vehicle, reduce driving bumps, and improve driving safety and comfort. Moreover, since the height of the connecting section 111 gradually decreases, the connecting section 111 can also help guide rainwater or surface water to flow toward the riverbed 112, avoiding damage to the road caused by accumulated water.

[0056] The riverbed 112 is located on the other side of the connecting section 111, and the riverbed 112 is connected to the connecting section 111 in the width direction (the riverbed 112 usually refers to a naturally formed low-lying area that may have seasonal water flows passing through). The riverbed 112 serves as a natural drainage channel and can effectively drain rainwater or surface water out of the road area to prevent water accumulation from affecting the road structure 1 and driving safety. Of course, retaining the riverbed 112 helps to maintain the local ecological environment, maintain water and soil balance, and reduce environmental damage caused by construction activities.

[0057] It is worth mentioning that a portion of the retaining wall 20 is set inside the riverbed 112. The retaining wall 20 not only supports the soil or other filling materials between the new and old roadbeds, but also protects the riverbed 112 from erosion, ensuring the long-term effectiveness of the drainage function of the road structure 1. Moreover, embedding part of the retaining wall 20 into the riverbed 112 increases the stability of the entire road structure 1, especially in the face of extreme weather conditions such as floods, and can better resist the impact of water flow.

[0058] According to some embodiments of the present invention, the road structure 1 further includes: connecting steel bars 70, at least a portion of the connecting steel bars 70 is located in the filling slag 50, one end of the connecting steel bars 70 is located in the reinforcing stone layer 60, and the other end of the connecting steel bars 70 is located in the wall portion 22 and / or the connecting section 111.

[0059] In some embodiments, the connecting steel bars 70 are passed through the filling slag 50, the reinforcing stone layer 60 and the wall portion 22 to connect the filling slag 50, the reinforcing stone layer 60 and the wall portion 22, thereby enhancing the overall connection strength of the road structure 1, thereby improving the stability of the road structure 1 and extending the service life of the road structure 1.

[0060] In other embodiments, the connecting steel bars 70 are passed through the filling slag 50, the reinforcing stone layer 60 and the connecting section 111 to connect the filling slag 50, the reinforcing stone layer 60 and the connecting section 111, thereby enhancing the overall connection strength of the road structure 1, thereby improving the stability of the road structure 1 and extending the service life of the road structure 1.

[0061] In some other embodiments, at least a portion of the connecting steel bars 70 is passed through the filling slag 50, the reinforcement stone layer 60 and the wall portion 22 to connect the filling slag 50, the reinforcement stone layer 60 and the wall portion 22, and at least another portion of the connecting steel bars 70 is passed through the filling slag 50, the reinforcement stone layer 60 and the connecting section 111 to connect the filling slag 50, the reinforcement stone layer 60 and the connecting section 111 to enhance the overall connection strength of the road structure 1, thereby improving the stability of the road structure 1 and extending the service life of the road structure 1.

[0062] It is worth noting that the connecting steel bars 70 can serve as guide rods for concrete, and at least part of the concrete flows along the connecting steel bars 70 , so that the concrete connects the connecting steel bars 70 , the filling slag 50 , the reinforcing stone layer 60 , the wall portion 22 and the connecting section 111 , so as to further enhance the integrity of the road structure 1 , thereby improving the stability of the road structure 1 .

[0063] Embodiment 4:

[0064] In this embodiment, based on the third embodiment, the groove 131 includes a first section 1311, a second section 1312 and a third section 1313 which are arranged in sequence in the width direction, the first section 1311 is arranged close to the passage section 12, the top of the first section 1311 is lower than the top of the passage section 12, the top of the second section 1312 is lower than the top of the first section 1311, the third section 1313 gradually increases in height in the direction away from the passage section 12, and the bottom of the third section 1313 is higher than the top of the second section 1312; wherein the concrete ditch 30 is arranged in the second section 1312, and the road structure 1 also includes: a reinforcing soil-stone layer 80, the reinforcing soil-stone layer 80 is arranged in the first section 1311, and the top of the reinforcing soil-stone layer is flush with the top of the passage section 12, and at least a portion of the reinforcing soil-stone layer 80 is located in the concrete ditch 30.

[0065] In some embodiments, the first section 1311 is located on a side close to the pass section 12, the top of the first section 1311 is lower than the top of the pass section 12, the second section 1312 is located between the first section 1311 and the third section 1313, the top of the second section 1312 is lower than the top of the first section 1311, the second section 1312 is the deepest part of the entire groove 131, the third section 1313 gradually increases in height in the direction away from the pass section 12, and the bottom of the third section 1313 is higher than the top of the second section 1312.

[0066] Since the second section 1312 is the deepest part of the defective groove 131, setting the concrete ditch 30 here can ensure that the concrete ditch 30 effectively collects and guides water flow to avoid water accumulation affecting road safety. The reinforcing soil and stone layer 80 is set in the first section 1311, and the top of the reinforcing soil and stone layer 80 is flush with the top of the pass section 12, ensuring the flatness of the road surface. Part of the reinforcing soil and stone layer 80 extends into the concrete ditch 30, which increases the connection strength between the reinforcing soil and stone layer 80 and the concrete ditch 30, and also helps to enhance the structural stability around the ditch.

[0067] According to some embodiments of the present invention, the compaction degree of the first section 1311 is P2, satisfying: P2≥0.85, and the compaction degree of the reinforced soil-rock layer 80 is P3, satisfying: P3≥0.95.

[0068] In some embodiments, the compaction degree P2 of the first section 1311 needs to satisfy P2 ≥ 0.85. Although the compaction degree requirement of the first section 1311 is slightly lower than that of the reinforced soil-rock layer 80, its compaction degree of at least 85% can ensure that the first section 1311 can provide sufficient support for the upper reinforced soil-rock layer 80. The first section 1311 is located on the side close to the passage section 12. The lower height design of the first section 1311 helps to guide the water flow, and the appropriate compaction degree can adapt to the terrain changes and reduce the risk of settlement. Moreover, the relatively low compaction degree requirement makes the construction process more flexible, especially in complex terrain or difficult to fully compact, it can still ensure basic structural performance.

[0069] The compaction degree P3 of the reinforced soil and stone layer 80 needs to satisfy P3 ≥ 0.95. The high compaction degree ensures that the reinforced soil and stone layer 80 has extremely high bearing capacity and stability, reduces settlement or deformation caused by vehicle load, and the top of the reinforced soil and stone layer 80 is flush with the top of the passage section 12, maintaining the flatness of the entire road surface and ensuring driving safety and comfort. Of course, the high-density compacted reinforced soil and stone layer 80 improves the overall durability of the structure, reduces maintenance requirements, and extends the service life of the road structure 1.

[0070] According to some embodiments of the present invention, a gap 31 is provided between the top of the concrete ditch 30 on one side away from the passage section 12 and the third section 1313 .

[0071] In some embodiments, the gap 31 is located between the top of the side of the concrete ditch 30 away from the passage section 12 and the third section 1313. The existence of the gap 31 can prevent soil, gravel or other debris from easily entering the concrete ditch 30, reduce the risk of ditch blockage, and ensure the long-term effective operation of the drainage system. Moreover, the gap 31 allows the material between the concrete ditch 30 and the third section 1313 to expand or contract slightly due to temperature changes, reducing the stress accumulation caused by thermal expansion and contraction, thereby protecting the structure from potential damage. Of course, the gap 31 facilitates subsequent inspection and cleaning work, making it easier for maintenance personnel to approach the concrete ditch 30 to perform necessary maintenance operations, such as removing silt or repairing damaged parts.

[0072] It can be understood that the gap 31 helps to guide the water flow to flow along a predetermined path, avoids water directly impacting the edge of the ditch, reduces the risk of water erosion on the ditch slope, and improves the efficiency of the drainage system by keeping the ditch opening unobstructed, especially in extreme weather conditions such as heavy rain, it can remove accumulated water more quickly to ensure driving safety. Of course, the presence of the gap 31 reduces the direct contact between the concrete ditch 30 and the third section 1313, reduces the possible interaction force between the two, especially the vibration or pressure caused by the vehicle load, thereby enhancing the independence and stability of their respective structures. At the same time, in some cases, the gap 31 can also serve as an additional drainage channel to help drain excess water, further reducing the drainage burden of the ditch.

[0073] Embodiment five:

[0074] The present invention provides a construction method, which is applicable to the expanded and widened road structure 1 described in any one of the above embodiments, and the construction method comprises:

[0075] A receiving groove 1121 is excavated on the first slope 11 , and a notch 131 is excavated on the second slope 13 .

[0076] First, a receiving groove 1121 for accommodating the retaining wall 20 is excavated on the first slope 11 according to the design requirements. The size and depth of the receiving groove 1121 need to be precisely controlled during the excavation process to ensure that the retaining wall 20 can be firmly embedded in the receiving groove 1121. At the same time, a groove 131 for setting the concrete ditch 30 is excavated on the second slope 13. Of course, the size of the groove 131 needs to be strictly implemented according to the design drawings to ensure the accuracy of the subsequent installation.

[0077] At least a portion of the retaining wall 20 is disposed in the receiving groove 1121 , and at least a portion of the concrete ditch 30 is disposed in the missing groove 131 .

[0078] At least part of the retaining wall 20 is placed in the receiving groove 1121 of the first slope 11. The installation of the retaining wall 20 needs to ensure the verticality and stability of the retaining wall 20, and the retaining wall 20 is properly fixed or reinforced as needed. At least part of the concrete ditch 30 is placed in the missing groove 131 of the second slope 13. The position and height of the concrete ditch 30 should meet the design requirements to ensure the effectiveness of the drainage function of the concrete ditch 30.

[0079] The top of the retaining wall 20 is adjusted to be flush with the top of the concrete ditch 30 .

[0080] After installation, the tops of the retaining wall 20 and the concrete ditch 30 must be carefully adjusted to the same level to ensure the flatness of the surface of the road structure 1. Any height difference may affect driving safety and comfort.

[0081] Concrete is filled between the retaining wall 20 and the concrete ditch 30 , and the top of the concrete is flush with the top of the retaining wall 20 and the top of the concrete ditch 30 . After the concrete solidifies, a concrete roadbed 40 is formed.

[0082] Concrete is filled between the retaining wall 20 and the concrete ditch 30. When filling, attention should be paid to uniform distribution to avoid voids or looseness. The top of the filled concrete needs to be flush with the top of the retaining wall 20 and the concrete ditch 30 to ensure the flatness and continuity of the entire road structure 1. After the filling is completed, wait for the concrete to completely solidify to form a solid concrete roadbed 40. It is worth noting that during the concrete solidification process, maintenance measures such as covering with moisturizing materials and controlling temperature should be taken to ensure the quality of the concrete roadbed 40.

[0083] It can be understood that through precise excavation and installation, as well as strict top height adjustment, the stability and functionality of the retaining wall 20 and the concrete ditch 30 are ensured, the stability of the road structure 1 is enhanced, and the flush design of the tops of all components (concrete roadbed 40, concrete ditch 30 and retaining wall 20) ensures the flatness of the road surface after expansion, thereby improving driving safety and comfort.

[0084] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A road expansion and widening structure, characterized in that: include: An existing roadbed, the existing roadbed comprising a first slope, a passage section and a second slope arranged in sequence in a width direction, the first slope gradually increasing in height in a direction toward the passage section, the second slope gradually increasing in height in a direction away from the passage section, the passage section being suitable for connecting the first slope with the second slope, and the second slope being provided with a notch; a retaining wall, the retaining wall extending in a height direction and spaced apart from the passage section, at least a portion of the retaining wall being disposed within the first slope, and a top of the retaining wall protruding from the passage section; A concrete ditch, the concrete ditch is arranged in the notch and spaced apart from the passage section, and the top of the concrete ditch is flush with the top of the retaining wall; A concrete roadbed is arranged between the retaining wall and the concrete ditch, and the top of the concrete roadbed is flush with the top of the retaining wall and the top of the concrete ditch.

2. The road expansion and widening structure according to claim 1, characterized in that: The retaining wall comprises: A pre-embedded portion, the pre-embedded portion being arranged in the first slope; A wall portion, at least a portion of which is disposed in the first slope, and a top of the wall portion is flush with a top of the concrete ditch.

3. The road expansion and widening structure according to claim 2 is characterized in that: The width of the wall portion gradually increases in a direction away from the embedded portion.

4. The road expansion and widening structure according to claim 3 is characterized in that: Also includes: Filling slag, the filling slag is arranged between the wall part and the passage section; A reinforcing stone layer, wherein the reinforcing stone layer is arranged above the filling slag, and the top of the reinforcing stone layer is flush with the top of the passage section; The compaction degree of the reinforced stone layer is P1, which satisfies: P1≥0.

95.

5. The road expansion and widening structure according to claim 4 is characterized in that: The first slope comprises: A connecting section, one side of the connecting section in the width direction is connected to the passing section, and the height of the connecting section gradually decreases in a direction away from the passing section; a riverbed, the riverbed being located on the other side of the connecting section in the width direction and connected to the connecting section; wherein At least a portion of the retaining wall is disposed within the riverbed.

6. The road expansion and widening structure according to claim 5, characterized in that: Also includes: The connecting steel bar is at least partially located in the filling slag, one end of the connecting steel bar is located in the reinforcing stone layer, and the other end of the connecting steel bar is located in the wall part and / or the connecting section.

7. The road expansion and widening structure according to claim 6, characterized in that: The notch includes a first section, a second section and a third section arranged in sequence in the width direction, the first section is arranged close to the passage section, the top of the first section is lower than the top of the passage section, the top of the second section is lower than the top of the first section, the height of the third section gradually increases in the direction away from the passage section, and the bottom of the third section is at the same height as the top of the second section; in The concrete ditch is arranged in the second section, and the road structure also includes: a reinforcing soil-stone layer, which is arranged in the first section, and the top of the reinforcing soil-stone layer is flush with the top of the passage section, and at least part of the reinforcing soil-stone layer is located in the concrete ditch.

8. The road expansion and widening structure according to claim 7, characterized in that: The compaction degree of the first section is P2, which satisfies: P2≥0.85; the compaction degree of the reinforced soil-stone layer is P3, which satisfies: P3≥0.

95.

9. The road expansion and widening structure according to claim 7, characterized in that: A gap is provided between the top of one side of the concrete ditch away from the passage section and the third section.

10. A construction method, which is applicable to the expanded and widened road structure according to any one of claims 1 to 9, characterized in that: include: Excavating a receiving groove on the first slope and excavating a missing groove on the second slope; Disposing at least a portion of the retaining wall in the receiving groove, and disposing at least a portion of the concrete ditch in the missing groove; Adjust the top of the retaining wall to be flush with the top of the concrete ditch; Concrete is filled between the retaining wall and the concrete ditch, the top of the concrete is flush with the top of the retaining wall and the top of the concrete ditch, and the concrete roadbed is formed after the concrete solidifies.

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