Arch-shaped prefabricated pile-up roadbed-based wave-shaped guardrail post anchoring structure and construction method

Abstract

The application provides a wave-shaped guardrail post anchoring structure based on an arch-shaped prefabricated pile stacking type roadbed and a construction method. A plurality of L-shaped prefabricated piles are installed on the arch-shaped prefabricated piles at the top of the filling layer on both sides of the arch-shaped prefabricated pile stacking type roadbed. Each L-shaped prefabricated pile comprises a side plate, the bottom of the side plate is provided with an arc-shaped surface consistent with the curvature of the top surface of the arch-shaped prefabricated pile and is supported on the arch-shaped prefabricated pile, the arc-shaped surface at the bottom of the side plate extends an arc-shaped anchoring plate to the front of the side plate, the anchoring plate is fixed on the arch-shaped prefabricated pile through bolts, the leveling layer and the pavement structure layer on both sides of the roadbed are paved on the inner side of the side plate of the L-shaped prefabricated pile, and the wave-shaped guardrail post is anchored on the L-shaped prefabricated pile through the anchoring holes preset on the top of the L-shaped prefabricated pile. The application solves the problem that the wave-shaped guardrail post is difficult to be installed and anchored on the arch-shaped prefabricated pile stacking type roadbed, and the L-shaped prefabricated pile also plays a role of a road shoulder wall.

Description

Technical Field

[0001] This invention belongs to the field of road construction technology and relates to the installation and construction of road guardrails, specifically to a corrugated guardrail post anchoring structure and construction method based on an arched precast component stacked roadbed. Background Technology

[0002] Corrugated beam guardrails are crucial protective facilities for ensuring highway traffic safety. They consist of multiple guardrail posts installed longitudinally along the roadbed, with corrugated plates installed between the posts. The corrugated plates absorb the impact force of out-of-control vehicles and transmit it to the guardrail posts. The guardrail posts, in turn, absorb bending moments and transmit the impact force to the foundation. Therefore, the anchoring performance of the guardrail posts directly determines the crashworthiness of the overall protective structure and the structural safety of the roadbed. Existing corrugated beam guardrails, depending on the specific application scenario, primarily employ the following anchoring methods for their posts:

[0003] 1. Direct driving of undisturbed soil: This method involves driving guardrail posts directly into the roadbed to a certain depth using a pile driving method. This method is suitable for roadbeds with uniform soil quality, no boulders, and no interference from underground pipelines.

[0004] 2. The pit-filling method involves excavating a pit of a certain depth on the roadbed, inserting the lower end of the guardrail post into the pit, and then backfilling and compacting it. This method is mainly suitable for roadbeds with gravel soil or localized rocky soil where direct piling is not possible.

[0005] 3. Drilled cast-in-place concrete pre-embedded type: This method involves drilling holes of a certain depth in the roadbed using drilling equipment, inserting the guardrail posts into the holes, and then pouring concrete to fix the posts in place. This method is suitable for rocky roadbeds and hardened concrete pavements.

[0006] 4. Flange bolt fixing type: A flange is installed on the exposed surface of the guardrail post at the installation location, and the lower end of the guardrail post is anchored to the flange. This method is mainly used on bridge decks, the top surface of concrete crash barriers, and pre-formed hardened road surfaces.

[0007] In patent CN121250734A, the applicant proposed an arched precast component stacked roadbed structure, including a roadbed foundation and a roadbed filling layer. The roadbed filling layer uses multiple layers of arched concrete precast components 1 arranged transversely along the roadbed as the load-bearing base, and is covered with a fill leveling layer and a pavement structure layer. This roadbed can reduce the amount of soil used for embankment roadbeds and is suitable for high-grade highway construction in areas with scarce soil resources. However, the following problems were encountered when installing corrugated guardrails in the later stages of road construction:

[0008] Due to the limited thickness of the topsoil on the roadbed, it is impossible to meet the 1.8m to 2.3m embedment thickness required for driven or buried anchors. Conventional drilling and cast-in-place pre-embedding processes require the anchor to be embedded in the concrete substrate to a depth of not less than 400mm, while the thickness of the arched precast components under this type of roadbed is only 12 to 20cm, which cannot meet the anchoring depth requirements of the anchors. In addition, if the flange bolt method is used, a flange needs to be pre-installed on the top of the arched precast component, but since the top of the arched precast component needs to be filled with topsoil, the working surface conditions for exposed flanges cannot be met.

[0009] In summary, none of the existing corrugated guardrail post installation methods are suitable for this type of arched precast block stacked roadbed. Therefore, there is an urgent need for a guardrail post installation method that can meet the requirements of arched precast block stacked roadbed. Summary of the Invention

[0010] The purpose of this invention is to address the above-mentioned problems by proposing an anchoring structure and construction method for corrugated guardrail posts based on arched precast block stacked roadbeds, so as to meet the installation requirements of corrugated guardrail posts for arched precast block stacked roadbeds.

[0011] This invention provides a corrugated guardrail post anchoring structure based on a stacked arched precast roadbed. The stacked arched precast roadbed includes a roadbed foundation, a fill layer, a leveling layer, and a pavement structure layer. The fill layer includes multiple arched precast components stacked in layers on the roadbed foundation. Each layer of arched precast components is arranged in multiple rows transversely along the roadbed, and each row is formed by sequentially connecting multiple arched precast components axially. The two arched feet of each upper arched precast component are supported on the shoulders or waists of two adjacent arched precast components in the lower layer. The leveling layer fills the spaces between and on top of the uppermost arched precast components. The pavement structure layer is laid on top of the leveling layer. The invention is characterized by including multiple L-shaped precast components, each L-shaped precast component being made of reinforced concrete and including a side plate. The bottom of the side plate has a curvature that matches the top surface curvature of the arched precast component. A uniform arc-shaped surface extends from the bottom arc of the side plate to the front of the side plate, forming an arc-shaped anchor plate. The anchor plate has multiple through holes for anchor bolts, and the top of the side plate has anchor holes for corrugated guardrail posts. Multiple L-shaped precast components are sequentially installed along the longitudinal direction of the roadbed on the arched precast components on both sides of the top of the roadbed filling layer. The ends of adjacent L-shaped precast components are sequentially joined together, and the arc-shaped surface at the bottom of each L-shaped precast component is completely fitted with the arch surface of the arched precast component. The anchor plate of the L-shaped precast component is anchored to the arched precast component by bolts that penetrate the wall panel of the arched precast component. The leveling layer and pavement structure layer of the roadbed are spread on both sides onto the inner side of the side plate of the L-shaped precast component and pressed onto the anchor plate. The top of the side plate of the L-shaped precast component is higher than the pavement structure layer. A corrugated guardrail post is inserted into each corrugated guardrail post anchor hole at the top of the side plate of the L-shaped precast component and fixed to the L-shaped precast component.

[0012] This invention provides a construction method for a corrugated guardrail post anchoring structure based on an arched precast component stacked roadbed, characterized by the following steps:

[0013] (1) The L-shaped prefabricated components are prefabricated in the factory and transported to the roadbed construction site;

[0014] (2) After the arched precast components of the roadbed filling layer are installed, the L-shaped precast components are installed sequentially on the arched precast components on both sides of the filling layer. The anchor plate of the L-shaped precast component is anchored to the arched precast component with bolts.

[0015] (3) The roadbed leveling layer and pavement structure layer are constructed in sequence. The leveling layer and pavement structure layer are spread on both sides to the inside of the side plate of the L-shaped precast component and compacted.

[0016] (4) After the road structure layer is completed, the corrugated guardrail post is installed in the anchor hole of the corrugated guardrail post at the top of the side plate of the L-shaped precast component, and micro-expansion concrete or high-strength non-shrink grout is injected into the anchor hole to fix the lower end of the corrugated guardrail post to the L-shaped precast component as one unit.

[0017] This invention was developed specifically for the structural characteristics of stacked arched precast roadbeds, solving the anchoring problem of corrugated guardrail posts in such roadbeds, and has the following advantages:

[0018] 1. This invention achieves the anchoring and rooting of the corrugated guardrail posts by anchoring the L-shaped precast component to the top of the arched precast component. The bottom surface of the L-shaped precast component matches the top surface of the arched precast component, and is anchored to the arched precast component through the bottom anchor plate. The installation structure is firm and can also reinforce the arched precast component, effectively preventing the ends of the arched precast component from chipping and cracking, and protecting the main structure of the roadbed.

[0019] 2. The top of the L-shaped prefabricated component has pre-set mounting holes or anchor flanges for guardrail posts, which facilitates the installation of guardrail posts; the guardrail posts and L-shaped prefabricated components are integrated into one unit to jointly withstand the impact force of vehicles, resulting in high safety.

[0020] 3. The roadbed leveling layer and pavement structure layer are compacted on the anchor plate of the L-shaped precast component. The L-shaped precast component, together with the arched precast component and the upper layer of weight, bears the impact moment and lateral load of the vehicle. This breaks away from the stress limitation of traditional deep-buried columns and ensures the overall anti-overturning and anti-lateral displacement performance of the columns.

[0021] 4. In addition to meeting the anchoring requirements of corrugated guardrail posts for arched precast block stacked roadbeds, this invention also produces the following beneficial effects: the L-shaped precast components can function as shoulder walls. Shoulder walls are typically installed to prevent roadside edge collapse or reduce slope. Conventional shoulder wall construction usually requires excavating foundation trenches on both sides of the roadbed and constructing them using masonry or cast-in-place methods, or embedding the lower part of the precast shoulder wall in the foundation trench before backfilling. However, since it is impossible to excavate foundation trenches on the roadbed for arched precast block stacked roadbeds, shoulder walls were not initially designed; instead, they are constructed as follows: Figure 1 As shown in the diagram, slopes of a certain width are provided on both sides of the leveling layer and the pavement structure layer. However, this requires increasing the overall width of the roadbed, thus increasing the land area and material consumption. Using this invention, the pavement structure layer can be laid on both sides of a baffle tightly attached to the L-shaped precast component. The L-shaped precast component acts as a shoulder wall, thus eliminating the need for slope protection and reducing the roadbed land area and filling work. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of the roadbed of the present invention in the transverse direction;

[0023] Figure 2 yes Figure 3 Enlarged view of point A in the image;

[0024] Figure 3 This is a longitudinal side view of the embodiment of the present invention, which has an arc-shaped surface at the bottom of the L-shaped precast component, on the outer side of the roadbed.

[0025] Figure 4 This is a longitudinal sectional view along the inner side of the roadbed of an embodiment of the present invention in which an arc surface is provided at the bottom of the L-shaped precast component.

[0026] Figure 5 This is a schematic diagram of the cross-sectional structure of an L-shaped prefabricated component;

[0027] Figure 6 This is a rear view structural diagram of an L-shaped prefabricated component with an arc-shaped surface at the bottom;

[0028] Figure 7 This is a front view structural diagram of an L-shaped prefabricated component with an arc-shaped surface at the bottom;

[0029] Figure 8 This is a longitudinal side view of the embodiment of the present invention, which has three arc-shaped surfaces at the bottom of the L-shaped precast component, on the outside of the roadbed.

[0030] Figure 9 This is a longitudinal sectional view along the inner side of the roadbed of an embodiment of the present invention in which three arc-shaped surfaces are provided at the bottom of the L-shaped precast component.

[0031] Figure 10 This is a schematic diagram of the three-dimensional structure of an L-shaped prefabricated component with three curved surfaces at the bottom, viewed from the front.

[0032] Figure 11 This is a rear view structural diagram of an L-shaped prefabricated component with three curved surfaces at the bottom.

[0033] Attached reference numerals: 1. Roadbed foundation; 2. Arched precast component; 21. Positioning block; 3. Roadbed leveling layer; 4. Pavement structure layer; 5. L-shaped precast component; 51. Side plate; 52. Arc-shaped surface; 53. Anchor plate; 54. Bolt through hole; 55. Corrugated guardrail post anchoring hole; 56. Mortise and tenon groove; 57. Tenon strip; 58. Positioning groove; 6. Bolt; 7. Corrugated guardrail post. Detailed Implementation

[0034] like Figure 1 , Figure 2 As shown, the arched precast component stacked roadbed includes a roadbed foundation, a filling layer, a leveling layer, and a pavement structure layer. The filling layer includes multiple arched precast components 2 stacked in layers on the roadbed foundation 1. Each layer of arched precast components is arranged in multiple rows along the transverse direction of the roadbed. Each row is formed by connecting multiple arched precast components sequentially along the axial direction. The arch feet on both sides of each arched precast component in the upper layer are supported on the arch shoulders or arch waists of two adjacent arched precast components in the lower layer, respectively. Multiple L-shaped precast components 5 are installed on the arched precast components 2 at the top of both sides of the roadbed filling layer.

[0035] like Figure 5 , Figure 6 , Figure 7 and Figure 10 , Figure 11 As shown, each L-shaped precast component 5 is made of reinforced concrete and has an L-shaped cross-section, including a side plate 51. The bottom of the side plate 51 is provided with an arc-shaped surface 52 that matches the curvature of the top surface of the arched precast component. An arc-shaped anchor plate 53 extends from the bottom arc surface of the side plate to the front of the side plate. The anchor plate is provided with multiple anchor bolt through holes 54. The top of the side plate is provided with corrugated guardrail post anchor holes 55.

[0036] like Figures 1 to 4 and Figure 8 , Figure 9As shown, multiple L-shaped precast components 5 are sequentially installed along the longitudinal direction of the roadbed on the arched precast components 2 on both sides of the top of the roadbed filling layer. The ends of adjacent L-shaped precast components are connected sequentially. The arc-shaped surface at the bottom of each L-shaped precast component 5 is completely in contact with the arched surface of the arched precast component 2. The anchor plate 53 of the L-shaped precast component is anchored to the arched precast component by bolts 6 that penetrate the wall panel of the arched precast component. The leveling layer 3 of the roadbed is filled between each arched precast component and on top of the top layer of the roadbed filling layer. The pavement structure layer 4 is laid on top of the leveling layer. The leveling layer and the pavement structure layer 4 are spread on both sides to the inner side of the side plate of the L-shaped precast component 5 and pressed on the anchor plate. The top of the side plate of the L-shaped precast component is higher than the pavement structure layer. A corrugated guardrail post 7 is inserted into the anchor hole of each corrugated guardrail post on the top of the side plate of the L-shaped precast component and fixed to the L-shaped precast component.

[0037] The aforementioned structure, with its L-shaped precast component anchored to the arched precast component by bolts and reinforced with top soil, ensures the stability of the installation structure. The L-shaped precast component provides an installation surface for the corrugated guardrail posts that is higher than the road surface. The corrugated guardrail posts are installed on the L-shaped precast component and anchored together with it. The corrugated guardrail posts and the L-shaped precast component share the impact force from vehicles and transfer the force to the roadbed filling layer. This achieves the installation and anchoring of the corrugated guardrail posts on the stacked arched precast roadbed and ensures its anti-overturning capability.

[0038] Figures 5 to 7 The figure shows a specific embodiment of the L-shaped precast component of the present invention. Each L-shaped precast component 5 has an arc-shaped surface 52 at the bottom of its side plate 51. The arc length of the arc-shaped surface is equal to the arc length of the arch surface of an arch-shaped precast component exposed on the top of the roadbed filling layer. An arc-shaped anchor plate 53 extends along the arc-shaped surface. The arc length of the anchor plate may be equal to or unequal to the arc length of the arc-shaped surface. Figure 3 , Figure 4 This describes the installation state of the L-shaped precast component in this embodiment on arched precast components, with one L-shaped precast component 5 installed on each arched precast component 2. The L-shaped precast component in this embodiment has a simple structure and is relatively easy to manufacture. However, during installation, circumferential displacement is prone to occur at the top of the arched precast component. Furthermore, the lower ends of the mating sides of adjacent L-shaped precast components are located at the intersection of the two arched precast components, where there is a certain angle. The lower end of the first installed L-shaped precast component tends to encroach on the installation space of the lower end of the subsequently installed L-shaped precast component, making it difficult to guarantee installation accuracy. The overall alignment of the top of the L-shaped precast component is also difficult to control.

[0039] Figure 10 , Figure 11 The diagram shown is a schematic representation of another embodiment of the L-shaped preform of the present invention. Figure 8 , Figure 9This is a schematic diagram of the installation state on the arched precast component according to this embodiment. Each L-shaped precast component 5 has three continuous arc-shaped surfaces 52 along the longitudinal direction at the bottom of its side plate 51, corresponding to three adjacent arched precast components at the top of the roadbed filling layer. The arc length of the middle arc-shaped surface at the bottom of the L-shaped precast component is equal to the arc length of the arch surface of the middle arched precast component exposed at the top of the roadbed filling layer. The arc lengths of the other two arc-shaped surfaces are half the arc lengths of the arch surfaces of the other two arched precast components exposed at the top of the roadbed filling layer. Along each arc-shaped surface on the L-shaped precast component side... An arc-shaped anchor plate 53 extends from the front of the slab. During installation, the bottom of each L-shaped precast component is supported on three adjacent arched precast components at the top of the roadbed fill layer. The arc-shaped surface in the middle of the bottom of the L-shaped precast component is fully in contact with the arch surface of the middle arched precast component exposed at the top of the roadbed fill layer. The other two arc-shaped surfaces are respectively in contact with the arch surface between the center line of the arch top of the other two arched precast components and the middle arched precast component. Each anchor plate 53 is anchored to the arched precast component 2 by bolts 6. In this embodiment, the L-shaped precast component is less prone to circumferential displacement during installation due to the constraint of the arched precast components on both sides. Furthermore, the joint end of the two L-shaped precast components is located at the arch top of the arched precast component, making it easy to control the installation accuracy and alignment.

[0040] Furthermore, such as Figure 10 , 11 As shown, among the three continuous arc-shaped surfaces 52 at the bottom of the L-shaped precast component's side panel, the two arc-shaped surfaces on both sides can be set higher than the middle arc-shaped surface; for example... Figure 8 , Figure 9 As shown, among the three adjacent arched precast components 2 at the top of the corresponding subgrade fill layer, the crown of the middle arched precast component is lower than the crowns of the other two arched precast components. When this L-shaped precast component is installed on the three arched precast components, due to its lower center of gravity and the higher height of the arched precast components on both sides, it can further limit the circumferential displacement of the L-shaped precast component and ensure installation accuracy.

[0041] Furthermore, among the three anchor plates 53 at the bottom of the L-shaped precast component, the middle anchor plate can be spaced apart from the two side anchor plates, and the outer sides of the two side anchor plates are flush with the sides of the side plates of the L-shaped precast component. If the three anchor plates are connected, a gap may form at the top of the junction of the two arched precast components, making it difficult for the leveling layer fill to fill the gap, thus creating voids. With the above arrangement, when the roadbed leveling layer is filled, the fill can be filled between the two anchor plates, ensuring the compaction of the leveling layer fill.

[0042] like Figure 10 As shown, in a specific implementation of the present invention, to achieve the docking of two adjacent L-shaped prefabricated components, a tenon groove 56 can be provided on one side of the side plate 51 of each L-shaped prefabricated component 5, and a tenon strip 57 can be provided on the other side. During the installation of the L-shaped prefabricated components, adjacent L-shaped prefabricated components are docked through the tenon groove and the tenon strip.

[0043] like Figure 2 and Figure 5 As shown in the illustration, in a specific implementation of the present invention, a positioning groove 58 can be provided at the bottom of each L-shaped precast component. Correspondingly, a positioning block 21 matching the positioning groove is provided at the top of the arched precast component on which the L-shaped precast component is installed. During installation of the L-shaped precast component, the positioning block 21 at the top of the arched precast component is inserted into the positioning groove 57 at the bottom of the L-shaped precast component. This structure can improve the installation accuracy of the L-shaped precast component on the arched precast component and ensure that the L-shaped precast component does not undergo lateral displacement when subjected to lateral pressure.

[0044] like Figure 2 As shown, the planar dimension of the anchor hole 55 of the corrugated guardrail post on the L-shaped precast component is larger than the cross-sectional dimension of the corrugated guardrail post 6. When installing the corrugated guardrail post, the lower end of each corrugated guardrail post 6 is inserted into the anchor hole 55 of the corrugated guardrail post on the L-shaped precast component. Then, micro-expansion concrete or high-strength non-shrink grout is poured into the anchor hole 55 to fix the lower end of the corrugated guardrail post to the L-shaped precast component as one unit.

[0045] The installation method of the above-mentioned corrugated guardrail posts in the anchor holes on the L-shaped prefabricated parts is similar to the existing drilling and casting-in-place pre-embedding method. Therefore, the depth of the anchor holes in this invention also refers to the drilling and casting-in-place pre-embedding method, and the depth of the anchor hole 55 of each corrugated guardrail post is not less than 400mm.

[0046] In addition, a flange can be pre-installed on the top of the side plate of the L-shaped precast component, and the bottom of the flange can be welded to the internal steel bars of the L-shaped precast component to anchor the guardrail post to the flange, similar to the existing flange bolt fixing method.

[0047] The construction method for the corrugated guardrail post anchoring structure based on the arched precast component stacked roadbed is as follows:

[0048] (1) Prefabricate L-shaped precast components in the factory and transport them to the roadbed construction site;

[0049] (2) After the arched precast components of the roadbed filling layer are installed, the L-shaped precast components are installed sequentially on the arched precast components on both sides of the filling layer. The anchor plate of the L-shaped precast component is anchored to the arched precast component with bolts.

[0050] (3) Construct the roadbed leveling layer and the pavement structure layer in sequence. Spread the leveling layer and the pavement structure layer on both sides to the inside of the side plate of the L-shaped precast component and compact them.

[0051] (4) After the road structure layer is completed, insert the corrugated guardrail post into the anchor hole of the corrugated guardrail post at the top of the side plate of the L-shaped precast component, accurately straighten it and ensure that the post is not tilted or deviated, then inject C25 micro-expansion concrete or high-strength non-shrink grout into the anchor hole and vibrate it to make the lower end of the post and the L-shaped precast component a whole.

[0052] Subsequent road construction includes installing corrugated plates on guardrail posts and installing road ancillary facilities to complete the road construction.

Claims

1. A corrugated guardrail post anchoring structure based on a stacked arched precast roadbed, wherein the stacked arched precast roadbed includes a roadbed foundation, a fill layer, a leveling layer, and a pavement structure layer. The fill layer includes multiple arched precast components stacked in layers on the roadbed foundation. Each layer of arched precast components is arranged in multiple rows transversely along the roadbed, and each row is formed by sequentially connecting multiple arched precast components axially. The arch feet on both sides of each upper arched precast component are supported on the arch shoulders or arch waists of two adjacent arched precast components in the lower layer, respectively. The leveling layer fills the spaces between and on top of the uppermost arched precast components, and the pavement structure layer is laid on top of the leveling layer. The structure is characterized by: The system comprises multiple L-shaped precast components, each made of reinforced concrete, including a side panel. The bottom of the side panel has an arc-shaped surface with the same curvature as the top surface of the arched precast component. An arc-shaped anchor plate extends forward from the bottom arc-shaped surface of the side panel, with multiple through holes for anchor bolts. The top of the side panel has corrugated guardrail post anchor holes. The multiple L-shaped precast components are sequentially installed along the longitudinal direction of the roadbed on the arched precast components on both sides of the top of the roadbed fill layer. The ends of adjacent L-shaped precast components are... The L-shaped precast components are connected sequentially, with the arc-shaped surface at the bottom of each L-shaped precast component completely fitting the arch surface of the arch precast component. The anchor plate of the L-shaped precast component is anchored to the arch precast component by bolts that penetrate the wall panel of the arch precast component. The leveling layer of the roadbed and the pavement structure layer are spread on both sides to the inside of the side plate of the L-shaped precast component and pressed onto the anchor plate. The top of the side plate of the L-shaped precast component is higher than the pavement structure layer. A corrugated guardrail post is inserted into the anchor hole of each corrugated guardrail post at the top of the side plate of the L-shaped precast component and fixed to the L-shaped precast component.

2. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: Each L-shaped precast component has an arc-shaped surface at its bottom, the arc length of which is equal to the arc length of the arch surface of an arch-shaped precast component exposed on the top of the roadbed filling layer, and an anchor plate extends along the arc-shaped surface; each L-shaped precast component is installed on an arch-shaped precast component on the top of the roadbed filling layer.

3. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: Each L-shaped precast component has three continuous arc-shaped surfaces along its longitudinal direction at the bottom, corresponding to three adjacent arch-shaped precast components at the top of the subgrade fill layer. The arc length of the middle arc-shaped surface at the bottom of the L-shaped precast component is equal to the arc length of the arch surface of the middle arch-shaped precast component exposed at the top of the subgrade fill layer. The arc lengths of the other two arc-shaped surfaces are half the arc lengths of the arch surfaces of the other two arch-shaped precast components exposed at the top of the subgrade fill layer. An anchor plate extends from the front of the side plate of the L-shaped precast component along each arc-shaped surface. The bottom of each L-shaped precast component is supported on the three adjacent arch-shaped precast components at the top of the subgrade fill layer. The middle arc-shaped surface at the bottom of the L-shaped precast component is fully in contact with the arch surface of the middle arch-shaped precast component exposed at the top of the subgrade fill layer. The other two arc-shaped surfaces are respectively in contact with the arch surface between the center line of the arch top of the other two arch-shaped precast components and the middle arch-shaped precast component. Each anchor plate is anchored to the arch-shaped precast component by bolts.

4. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 3, characterized in that: In the bottom three continuous arc surfaces of the L-shaped precast component side plate, the two arc surfaces on both sides are higher than the middle arc surface. In the top three adjacent arched precast components of the corresponding subgrade filling layer, the crown of the middle arched precast component is lower than the crowns of the other two arched precast components.

5. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 3 or 4, characterized in that: Of the three anchor plates at the bottom of the L-shaped precast component, the middle anchor plate has a certain distance from the anchor plates on both sides, and the outer sides of the anchor plates on both sides are flush with the sides of the side plate of the L-shaped precast component.

6. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: Each L-shaped precast component has a mortise and tenon on one side of its side panel and a tenon on the other side. Adjacent L-shaped precast components are joined together by the mortise and tenon.

7. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: Each L-shaped precast component has a positioning groove at its bottom, and the top of the arched precast component on which the L-shaped precast component is installed has a positioning block that matches the positioning groove; the positioning block at the top of the arched precast component is inserted into the positioning groove at the bottom of the L-shaped precast component.

8. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: The planar dimension of the anchoring hole of the corrugated guardrail post is larger than the cross-sectional dimension of the corrugated guardrail post. The lower end of each corrugated guardrail post is inserted into the anchoring hole. Micro-expansion concrete or high-strength non-shrink grout is poured into the anchoring hole to fix the lower end of the corrugated guardrail post to the L-shaped precast component as one unit.

9. The corrugated guardrail post anchoring structure based on an arched prefabricated stacked roadbed according to claim 1, characterized in that: The depth of the anchor hole for each corrugated guardrail post shall not be less than 400mm.

10. The construction method of the corrugated guardrail post anchoring structure based on the stacked arched precast roadbed as described in any one of claims 1 to 9, characterized in that, Includes the following steps: (1) The L-shaped prefabricated components are prefabricated in the factory and transported to the roadbed construction site; (2) After the arched precast components of the roadbed filling layer are installed, the L-shaped precast components are installed sequentially on the arched precast components on both sides of the filling layer. The anchor plate of the L-shaped precast component is anchored to the arched precast component with bolts. (3) The roadbed leveling layer and pavement structure layer are constructed in sequence. The leveling layer and pavement structure layer are spread on both sides to the inside of the side plate of the L-shaped precast component and compacted. (4) After the road structure layer is completed, the corrugated guardrail post is installed in the anchor hole of the corrugated guardrail post at the top of the side plate of the L-shaped precast component, and micro-expansion concrete or high-strength non-shrink grout is injected into the anchor hole to fix the lower end of the corrugated guardrail post to the L-shaped precast component as one unit.

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