A pile-plank subgrade structure and its construction method

Abstract

The present application provides a pile-slab roadbed structure and a construction method thereof, and relates to the field of civil engineering. The pile-slab roadbed structure is suitable for being arranged on the side of the seawall close to the open sea, and includes a cushion layer, and a first suppression platform and a main body arranged on the cushion layer in sequence from the open sea side to the seawall; the main body includes a bottom plate auxiliary structure, a pile-slab structure and a road structure arranged on the ground, and the pile-slab structure includes a bottom plate, a side wall and bored piles placed on the bottom plate auxiliary structure, and the end of the bottom plate away from the seawall is connected to the side wall and forms an L shape with the side wall, and the end of the seawall close to the open sea side, the side wall and the bottom plate jointly form a structural groove, and the road structure is arranged in the structural groove, and one end of the bored pile is connected to the bottom plate, and the other end passes through the bottom plate auxiliary structure and the cushion layer in sequence and then extends downward to the bearing layer. The pile-slab roadbed structure can not only effectively save land but also has better stability, and the construction method is simple, controllable and efficient.

Description

Technical Field

[0001] This application relates to the field of civil engineering, and more particularly, to a pile - slab subgrade structure and its construction method. Background Art

[0002] With the development of the integrated concept of "transportation + tourism", more and more cities are building coastal tourism roads. Coastal tourism roads can not only expand the urban space but also connect rich tourism resources, making the coastal roads increasingly prominent in their important position. The route of the coastal road mainly follows the coastline and inevitably passes through soft soil areas. Due to the special nature of the geological formation of the coastal road, the subgrade area has characteristics such as deep soft soil, high waves, deep water, and complex ocean tidal movements. If the soft soil foundation is not properly treated, large foundation settlements and uneven settlements will occur, and the stability and safety of the subgrade will be greatly affected. In this case, to ensure the stability of the subgrade, most coastal roads at home and abroad adopt slope - type seawalls. However, slope - type seawalls mean that the embankment body occupies a large sea area and the volume of fill is large. In the era of rapid population growth and resource shortage, this makes the construction of coastal roads more and more difficult. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a pile - slab subgrade structure and its construction method, which can improve the above - mentioned problems, effectively save land and have a more stable structure.

[0004] In a first aspect, the embodiments of this application provide a pile - slab subgrade structure, which is suitable for being arranged on the side of the seawall near the open - sea side. The pile - slab subgrade structure includes a cushion layer, and a first surcharge platform and a main body arranged in sequence from the open - sea side to the seawall on the cushion layer.

[0005] The main body includes a floor accessory structure, a pile - slab structure, and a road structure. The floor accessory structure is arranged on the ground. The pile - slab structure includes a floor slab, a side wall, and bored cast - in - place piles. The floor slab is placed on the floor accessory structure. One end of the floor slab facing away from the seawall is connected to the side wall and forms an L - shape with the side wall. One end of the seawall near the open - sea side, the side wall, and the floor slab together form a structural groove. The road structure is arranged in the structural groove. One end of the bored cast - in - place pile is connected to the floor slab, and the other end passes through the floor accessory structure and the cushion layer in sequence and then extends downward to the bearing stratum. The first surcharge platform is connected to the side of the side wall facing away from the seawall.

[0006] In the above implementation process, the pile - slab subgrade structure is constructed by relying on the existing old seawall and the first ballast platform, avoiding the use of the existing sloping seawall to effectively save the occupied area of the sea area. The overall structure is more optimized and compact than the ordinary coastal highway subgrade structure, the overall structure is simpler and more practical, and the construction is also more convenient and fast. Through the setting of the cushion layer, the strength of the foundation of the pile - slab subgrade structure can be enhanced, the load can be effectively distributed, and the overall stability of the pile - slab subgrade structure can be improved. By setting the first ballast platform at one end of the main body close to the open - sea side, the impact and erosion of wind waves and tides can be prevented, greatly ensuring the stability of the main body. By driving the bored cast - in - place pile to the bearing stratum, connecting the bored cast - in - place pile with the bottom slab, and laying the bottom - slab accessory structure under the bottom slab, the foundation settlement can be effectively reduced. Cooperating with the first ballast platform, the stability of the pile - slab subgrade structure can be effectively improved; by setting the road structure in the structural groove, the stability of the road structure can be effectively improved. At the same time, while the side wall provides support for the road structure, it can also prevent seawater and sea waves on the open - sea side from surging into the highway area, taking into account the flood - control function and further ensuring the stability of the road structure.

[0007] In a possible implementation, the bottom - slab accessory structure includes a fine - aggregate concrete protective layer, a first waterproof layer, and a plain - concrete leveling layer that are stacked in sequence from top to bottom. The bored cast - in - place pile passes through the plain - concrete leveling layer, the first waterproof layer, and the fine - aggregate concrete protective layer in sequence and then connects with the bottom slab, and the steel bars of the bored cast - in - place pile are connected with the steel bars of the bottom slab.

[0008] In the above implementation process, by connecting the steel bars of the bored cast - in - place pile with the steel bars of the bottom slab, the bored cast - in - place pile is effectively connected with the reinforced - concrete layer, preventing the displacement of the bottom slab and ensuring the stability of the pile - slab subgrade structure. At the same time, the setting of the fine - aggregate concrete protective layer, the first waterproof layer, and the plain - concrete leveling layer effectively guarantees the construction quality and durability of the bottom slab, improving the stability and service life of the pile - slab subgrade structure.

[0009] In a possible implementation, the end of the side wall far from the ground is higher than the road structure and the first ballast platform.

[0010] In the above implementation process, through the above setting, the surging of sea waves into the road - structure area can be effectively prevented, and the flood - control effect is good.

[0011] In a possible implementation, a second waterproof layer is provided on the side of the side wall facing away from the seawall, and the first ballast platform is connected to the side wall through the second waterproof layer.

[0012] In the above implementation process, through the setting of the second waterproof layer, it is ensured that the side wall is not easily eroded by seawater during flood control, so as to improve the service life of the side wall.

[0013] In a possible implementation, the road structure includes: a roadbed formed by a mixture of earth and stone filled in a structural trench, and a road surface structure laid on the upper surface of the roadbed. The longitudinal projection of the bottom plate on the upper surface of the roadbed should be greater than or equal to the width of the road surface structure. Drainage grooves are provided at both ends of the road surface structure and arranged along the extension direction of the pile-plank roadbed structure.

[0014] In the above implementation process, the roadbed formed by filling the mixture of earth and stone on the pile-plank structure can effectively control the compaction degree of the roadbed, improve the construction quality of the roadbed, greatly ensure the safety and comfort of road driving. At the same time, the setting of the drainage grooves also further reduces the erosion of surface water on the side wall and improves the stability of the side wall.

[0015] In a possible implementation, one end of the seawall facing the open sea side has a second ballast platform. The height of one end of the seawall near the second ballast platform is higher than the height of the road structure. The height of the second ballast platform is lower than the height of the roadbed so that the roadbed can cover the second ballast platform. A vegetation layer is provided on the upper surface of the roadbed corresponding to the position of the second ballast platform.

[0016] Optionally, a third waterproof layer is provided on the surface of the second ballast platform.

[0017] In the above implementation process, the lateral displacement of the main structure is effectively limited by the second ballast platform and the first ballast platform. At the same time, the stability of the pile-plank roadbed structure is ensured by the fact that the roadbed can cover the second ballast platform and cooperate with the third waterproof layer to prevent water seepage.

[0018] In a possible implementation, the cushion layer includes a bagged crushed stone compaction layer, a first woven geotextile layer, a crushed stone layer, and a second woven geotextile layer stacked in sequence from top to bottom. The strength of the first woven geotextile layer is greater than that of the second woven geotextile layer.

[0019] In the above implementation process, through the above settings, the strength of the foundation of the pile-plank roadbed structure is enhanced, the load is effectively distributed, and the overall stability of the pile-plank roadbed structure is improved.

[0020] In a possible implementation, the first ballast platform includes a base body, a protective layer, and tetrahedra. The base body includes a slope section and a flat section arranged in sequence from the open sea side to the seawall direction. The slope section is connected to the flat section. The protective layer is provided on the surface of the base body. The tetrahedra are provided outside the protective layer corresponding to the flat section, and the tetrahedra are located at one end of the flat section close to the side wall.

[0021] In the above implementation process, through the specific settings of the protective layer and the tetrahedra, the effect of the first ballast platform in preventing the impact and erosion of wind waves and tides is effectively ensured, the stability of the first ballast platform is guaranteed, and at the same time, the service life of the first ballast platform is improved.

[0022] In a second aspect, an embodiment of the present application provides a construction method for a pile-plate subgrade structure, which includes:

[0023] Construct the bedding course corresponding to the first compaction platform, backfill the first compaction platform, and use the first compaction platform constructed first and the existing seawall to block the seawater on the outer sea side, facilitating the subsequent construction of the pile-plate main structure.

[0024] Construct the bedding course corresponding to the main structure on the ground between the first compaction platform and the seawall, then construct bored cast-in-place piles, with one end of the bored cast-in-place piles driven into the bearing stratum and the other end reserved with a length extending into the floor accessory structure. Then, construct the floor accessory structure on the bedding course corresponding to the main structure, formwork and pour the floor on the floor accessory structure. The pile top of the bored cast-in-place piles is connected to the floor, and a side wall is poured at one end of the floor away from the seawall, so that the side wall, the floor, and the seawall jointly form a structural trough; construct the road structure in the structural trough.

[0025] In the above implementation process, the construction is convenient, simple, and effectively ensures the stability of the pile-plate subgrade structure. Specifically, by first constructing the first compaction platform on the outer sea side, the seawater is effectively blocked from entering the main construction area, which also serves as a construction cofferdam and access road, ensuring the structural stability and construction convenience during the construction of the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of the pile-plate subgrade structure of the present application;

[0028] Figure 2 It is a schematic structural diagram of the road structure of the present application;

[0029] Figure 3 It is a schematic structural diagram of the drainage trough of the present application.

[0030] Icons: 20-seawall; 210-second suppression platform; 220-third waterproof layer; 10-pile-board roadbed structure; 1203-fine stone concrete protective layer; 1205-first waterproof layer; 1207-plain concrete leveling layer; 121-bottom plate; 123-side wall; 124-second waterproof layer; 126-bored piles; 130-roadbed; 140-pavement structure; 141-surface layer; 143-base layer; 145-subbase layer; 150-drainage ditch; 151-cover plate; 153-ditch body; 161-bagged crushed stone top layer; 163-first woven geotextile layer; 165-crushed stone cushion layer; 167-second woven geotextile layer; 181-base; 183-protective layer; 185-twist block. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0033] Example

[0034] See also Figure 1 A pile-slab roadbed structure 10 is suitable for being arranged on the side of a seawall 20 close to the open sea, which can effectively save land and improve stability. The open sea side involved in this application refers to the end facing the sea, and the seawall 20 refers to an old seawall arranged on the coast (the existing seawall 20 before the construction of the pile-slab roadbed structure 10).

[0035] It should be noted that the seawall 20 is arranged along the coastline, and one end thereof facing the open sea side has a second suppression platform 210 to ensure the stability of the seawall 20. That is, the seawall 20 is an old seawall with the second suppression platform 210.

[0036] See also Figure 1 as well as Figure 2 The pile-sheet roadbed structure 10 includes a cushion layer, and a first suppression platform and a main body arranged on the cushion layer in sequence from the outer sea side to the seawall 20 .

[0037] The cushion layer includes a bagged gravel pressure top layer 161, a first woven geotextile layer 163, a gravel cushion layer 165 and a second woven geotextile layer 167 which are stacked in sequence from top to bottom. The strength of the first woven geotextile layer 163 is greater than that of the second woven geotextile layer 167. The cushion layer is required to have a substantially flat surface, the gravel cushion layer 165 is densely filled, the gravel cushion layer 165 is laid closely following the first woven geotextile, and the edge of the cushion layer is temporarily supported by bagged gravel or short piles to prevent it from being washed away by waves.

[0038] The first woven geotextile layer 163 is, for example, made of high-strength woven geotextile.

[0039] When the edges of the first woven geotextile layer 163 and the second woven geotextile layer 167 of the mattress layer are overlapped, a wide-width woven polymer cloth is used, and the overlap width is greater than 50 cm, and high-strength nylon yarn or polyester yarn is used for sewing.

[0040] The main body includes the base plate auxiliary structure, the pile-plate structure and the road structure.

[0041] The bottom plate auxiliary structure is laid on the mattress layer, that is, the mattress layer is laid on the bottom of the first pressing platform and the bottom plate auxiliary structure.

[0042] The bottom plate auxiliary structure includes a fine stone concrete protective layer 1203, a first waterproof layer 1205 and a plain concrete leveling layer 1207 which are stacked in sequence from top to bottom. The plain concrete leveling layer 1207 is cast by C20 plain concrete. The fine stone concrete protective layer 1203, the first waterproof layer 1205 and the plain concrete leveling layer 1207 effectively ensure the construction quality and durability of the bottom plate 121, and improve the stability and service life of the pile-slab roadbed structure 10.

[0043] The pile-sheet structure includes a bottom plate 121 , side walls 123 and bored piles 126 .

[0044] The bottom plate 121 abuts against the end of the first suppression platform facing the sea, and the lateral position of the bottom plate 121 is limited by the second suppression platform 210 and the first suppression platform, thereby ensuring the stability of the bottom plate 121. The bottom plate 121 is cast by C45 marine reinforced concrete, for example.

[0045] The side wall 123 is connected to the end of the bottom plate 121 away from the seawall 20, and the side wall 123 and the bottom plate 121 form an L shape. The side wall 123, the bottom plate 121 and the end of the seawall 20 close to the open sea side together enclose a structural groove, wherein the structural cross section of the structural groove is quasi-U-shaped. The side wall 123 is cast by C45 marine reinforced concrete, for example, and has high strength and good connection effect with the bottom plate 121.

[0046] Optionally, the bottom plate 121 and the side wall 123 are cast in an integrally formed manner to ensure the stability of the connection, and the steel bars of the bottom plate 121 are connected to the steel bars of the side wall 123.

[0047] It should be noted that the end of the side wall 123 away from the ground is higher than the road structure and the first compaction platform, effectively preventing sea waves from surging into the range of the road structure, and the flood prevention effect is good. However, the specific height of the side wall 123 is determined by the design tide level and the wave prevention requirements during the reference period, and will not be limited here.

[0048] A second waterproof layer 124 is provided on the side of the side wall 123 facing away from the seawall 20. For example, the second waterproof layer 124 is closely adhered to the side wall of the side wall 123 facing away from the seawall 20 and covers the side wall of the side wall 123 facing away from the seawall 20. Through the setting of the second waterproof layer 124, it is ensured that the side wall 123 is not easily soaked and eroded by seawater during flood prevention, so as to improve the service life of the side wall 123.

[0049] It should be noted that the end of the second waterproof layer 124 close to the first compaction platform should be connected to the first waterproof layer 1205 to prevent water leakage at the connection between the two.

[0050] One end of the bored cast-in-place pile 126 is connected to the bottom plate 121, and the other end sequentially passes through the bottom plate accessory structure and the cushion layer and extends downward to the bearing layer; specifically, the end of the bored cast-in-place pile 126 away from the bearing layer sequentially passes through the plain concrete leveling layer 1207, the first waterproof layer 1205 and the fine aggregate concrete protective layer 1203 and then is connected to the bottom plate 121, and the steel bars of the bored cast-in-place pile 126 are connected to the steel bars of the bottom plate 121, effectively improving the stability between the bored cast-in-place pile 126 and the bottom plate 121. Among them, the bored cast-in-place pile 126 is obtained by casting with C30 reinforced concrete, for example.

[0051] Optionally, a limiting groove (not shown in the figure) is provided on the side of the bottom plate 121 close to the fine aggregate concrete protective layer 1203, and the end of the bored cast-in-place pile 126 away from the bearing layer is embedded in the limiting groove to effectively ensure the stability of the connection between the two and prevent instability caused by displacement. At the same time, the inner wall of the limiting groove can be composed of steel plates, etc., and will not be limited here.

[0052] The number of the bored cast-in-place piles 126 is multiple, and among them, the multiple bored cast-in-place piles 126 are arranged in a rectangular array, specifically a square array, at the bottom of the bottom plate 121 to ensure the evenness of the force on the bottom plate 121 and the stability of the formed structural groove.

[0053] Please refer to Figure 2 , the road structure is arranged in the structural groove.

[0054] Specifically, the road structure includes a roadbed 130 and a pavement structure 140.

[0055] The roadbed 130 is formed by the soil-rock mixture filled in the structural trough, which can effectively control the compaction degree of the roadbed 130, improve the construction quality of the roadbed 130, and greatly ensure the safety and comfort of road driving. Among them, the soil-rock mixture should meet the requirements of relevant specifications.

[0056] Among them, the height of the second compaction platform 210 is lower than that of the roadbed 130 so that the roadbed 130 can cover the second compaction platform 210. At the same time, the height of one end of the seawall 20 close to the second compaction platform 210 is higher than the height of the road structure. That is to say, the roadbed 130 can be limited by the side of the seawall 20 close to the second compaction platform 210 to prevent the lateral displacement of the roadbed 130, and at the same time effectively cover the second compaction platform 210.

[0057] Optionally, in order to further improve the stability, a third waterproof layer 220 is provided on the surface of the second compaction platform 210 to prevent moisture from seeping back into the main body and reducing the stability of the main body. It should be noted that one end of the third waterproof layer 220 is connected to the first waterproof layer 1205 to prevent water leakage at the connection, and the other end is sequentially laid on the surface of the second compaction platform 210 and the side of the seawall 20 facing the sea end and is flush with the roadbed 130.

[0058] It should be noted that the first waterproof layer 1205, the second waterproof layer 124 and the third waterproof layer 220 in this application can all adopt synthetic resin polymer waterproof coiled materials, which have good waterproof effects.

[0059] A vegetation layer is provided on the upper surface of the roadbed 130 corresponding to the position of the second compaction platform 210. Through the setting of the vegetation layer, on the one hand, the roadbed 130 is effectively fixed, and on the other hand, the ecological ornamental value is improved.

[0060] The road surface structure 140 is laid on the upper surface of the roadbed 130.

[0061] The road surface structure 140 is arranged at the longitudinal projection of the bottom plate 121 on the upper surface of the roadbed 130, and the longitudinal projection of the bottom plate 121 on the upper surface of the roadbed 130 should not be less than the width of the road surface structure 140. Through the above settings, the stability of the road surface structure 140 during actual use is ensured.

[0062] As mentioned above, therefore, the width of the bottom plate 121 is determined by the width of the roadbed 130.

[0063] Please refer to Figure 2 and Figure 3 , drainage grooves 150 are provided at both ends of the road surface structure 140 and are arranged along the extension direction of the pile-plank roadbed structure 10. Through the setting of the drainage grooves 150, the effective collection of surface water is ensured, and the surface water is prevented from infiltrating into the roadbed 130 and eroding the side wall 123.

[0064] The drainage trough 150 can be composed of a cover plate 151 and a trough body 153. Among them, the drainage trough cover plate 151 can be precast with C30 concrete, and the trough body 153 can be constructed by cast-in-place concrete masonry with C25 concrete. The cover plate 151 is detachably arranged at the opening of the trough body 153, and the cover plate 151 is provided with a comb-shaped water inlet trough, thereby effectively filtering some large garbage.

[0065] Among them, the road surface structure 140 includes a surface layer 141, a base layer 143, and a sub-base layer 145 that are sequentially stacked from top to bottom.

[0066] The first compaction platform is connected to the side of the side wall 123 facing away from the seawall 20.

[0067] The first compaction platform includes a base body 181, a protective layer 183, and acubos 185.

[0068] The base body 181 includes a slope section and a flat section that are sequentially arranged from the open sea side to the seawall 20 direction, and the slope section is connected to the flat section.

[0069] The protective layer 183 is arranged on the surface of the base body 181. Among them, the protective layer 183 is composed of randomly placed large boulders, and the weight of a single randomly placed large boulder is not less than 200 kg.

[0070] The acubos 185 is arranged on the outside of the protective layer 183 corresponding to the flat section, and the acubos 185 is located at one end of the flat section close to the side wall 123. Among them, the weight of a single acubos 185 ≥ 5 t.

[0071] The construction method of the above pile-plate subgrade structure 10 includes:

[0072] Construct the bedding layer corresponding to the first compaction platform, and then fill and throw the first compaction platform. Use the first compaction platform and the existing seawall 20 constructed first to cut off the seawater on the open sea side, which is convenient for subsequent construction of the main body.

[0073] Then construct the bedding layer corresponding to the main structure on the ground between the first compaction platform and the seawall 20, and then construct the bored cast-in-place piles 126 between the first compaction platform and the seawall 20. Among them, the pile tip of the bored cast-in-place pile 126 should be driven into the bearing layer, and the length of the pile top of the bored cast-in-place pile 126 should be reserved to extend into the structural floor slab 121; construct a plain concrete leveling layer 1207, a first waterproof layer 1205, and a fine aggregate concrete protective layer 1203 in sequence on the bedding layer corresponding to the main structure; formwork and pour the floor slab 121 of the pile-plate structure on the fine aggregate concrete protective layer 1203, and the pile top of the bored cast-in-place pile 126 extends into the floor slab 121, and the steel bars of the bored cast-in-place pile 126 are connected to the steel bars of the floor slab 121. Pour the side wall 123 at one end of the floor slab 121 facing away from the seawall 20, so that the side wall 123, the floor slab 121, and the bored cast-in-place pile 126 jointly form a pile-plate structure, and the side wall 123, the floor slab 121, and one end of the seawall 20 close to the open sea side jointly form a structural groove.

[0074] Fill the subgrade 130 with earth-rock mixture, construct the construction drainage trough 150 and pave the road surface structure 140 within the area enclosed by the pile-plank structure and the old seawall 20.

[0075] Among them, since the height of one end of the seawall 20 close to the second berm 210 is higher than the height of the road structure and the height of the second berm 210 is lower than the height of the subgrade 130, after actually filling the second berm 210, the existing berm of the old seawall can be excavated according to actual needs to meet the above requirements, then a third waterproof layer 220 is laid on its surface, and then the main body is constructed.

[0076] In summary, the construction method of the pile-plank subgrade structure provided by the present application is controllable and simple in operation. The obtained pile-plank subgrade structure is applicable to coastal areas, can rely on the seawall and the second berm, effectively saves land and is safe and stable.

[0077] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pile-plank subgrade structure is suitable for being arranged on one side of a seawall close to the open sea side, and is characterized in that, The pile-slab roadbed structure includes a cushion layer, and a first suppression platform and a main body arranged on the cushion layer in sequence from the outer sea side to the seawall; The main body comprises a bottom plate auxiliary structure, a pile-plate structure and a road structure. The bottom plate auxiliary structure is arranged on the ground. The pile-plate structure comprises a bottom plate, a side wall and bored cast-in-place piles. The bottom plate is placed on the bottom plate auxiliary structure. The end of the bottom plate away from the seawall is connected to the side wall and forms an L shape with the side wall. The end of the seawall close to the open sea, the side wall and the bottom plate jointly form a structural groove. The road structure is arranged in the structural groove. One end of the bored cast-in-place pile is connected to the bottom plate, and the other end passes through the bottom plate auxiliary structure and the cushion layer in sequence and then extends downward to the bearing layer. The first suppression platform is connected to a side of the side wall facing away from the seawall; The bottom plate auxiliary structure includes a fine stone concrete protective layer, a first waterproof layer and a plain concrete leveling layer stacked in sequence from top to bottom, the bored piles pass through the plain concrete leveling layer, the first waterproof layer and the fine stone concrete protective layer in sequence and are connected to the bottom plate, and the steel bars of the bored piles are connected to the steel bars of the bottom plate; A second waterproof layer is provided on the side of the side wall facing away from the seawall, and the first suppression platform is connected to the side wall via the second waterproof layer; The road structure comprises: a roadbed formed by a soil-rock mixture filled in the structure groove and a pavement structure laid on the upper surface of the roadbed, the longitudinal projection of the bottom plate on the upper surface of the roadbed should be greater than or equal to the width of the pavement structure, and drainage grooves arranged along the extension direction of the pile-sheet roadbed structure are provided at both ends of the pavement structure; The end of the seawall facing the open sea has a second suppression platform, the height of the end of the seawall close to the second suppression platform is higher than the height of the road structure, and the height of the second suppression platform is lower than the height of the roadbed so that the roadbed can cover the second suppression platform.

2. The pile-plank subgrade structure according to claim 1, wherein, One end of the side wall away from the ground is higher than the road structure and the first suppression platform.

3. The pile-plank subgrade structure according to claim 1, characterized in that, A vegetation layer is provided on the upper surface of the roadbed corresponding to the position of the second suppression platform.

4. The pile-plank subgrade structure according to claim 3, wherein A third waterproof layer is provided on the surface of the second suppression platform.

5. The pile-plank subgrade structure according to any one of claims 1-2, characterized in that, The mattress layer includes a bagged gravel pressure layer, a first woven geotextile layer, a gravel cushion layer and a second woven geotextile layer which are sequentially stacked from top to bottom, and the strength of the first woven geotextile layer is greater than that of the second woven geotextile layer.

6. The pile-plank subgrade structure according to any one of claims 1-2, characterized in that, The first suppression platform includes a base, a protective layer and a torsion block. The base includes a slope section and a plane section arranged in sequence from the open sea side to the seawall. The slope section is connected to the plane section. The protective layer is arranged on the surface of the base. The torsion block is arranged on the outer side of the protective layer corresponding to the plane section. The torsion block is located at one end of the plane section close to the side wall.

7. A construction method for a pile-slab roadbed structure according to claim 1, characterized in that: Construct the cushion layer corresponding to the first suppression platform and fill the first suppression platform; Construct a cushion layer for the main structure corresponding to the ground between the first compaction platform and the seawall, then construct bored cast-in-place piles, and one end of the bored cast-in-place piles should be driven into the bearing stratum, while the other end reserves a length extending into the floor accessory structure. Then, construct the floor accessory structure on the cushion layer corresponding to the main structure, formwork and pour the floor on the floor accessory structure. Connect the top of the bored cast-in-place piles to the floor. Pour the side wall at one end of the floor facing away from the seawall to form a structural groove jointly by the side wall, the floor and the seawall; construct the road structure in the structural groove.

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