CN113106799A

CN113106799A - Roadbed structure of road and bridge engineering and construction method thereof

Info

Publication number: CN113106799A
Application number: CN202110407485.6A
Authority: CN
Inventors: 王娜
Original assignee: Southern Engineering Corp Of Nuclear Industry
Current assignee: Southern Engineering Corp Of Nuclear Industry
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-07-13

Abstract

The utility model relates to a road bridge construction technical field, especially, relate to a roadbed structure of road bridge engineering and construction method thereof, it includes excavation highway section and fill highway section, be provided with the side slope of echelonment on the fill highway section, the bottom of side slope is provided with the road bed basic unit, be provided with the road bed on road and the basic unit, the road bed includes the filler layer that sets gradually from bottom to top, water barrier and fine stone concrete layer, be provided with the drainage mechanism who is used for supplementary filler layer drainage in the filler layer, drainage mechanism includes a plurality of longitudinal drain pipes that set gradually and be connected through first coupling assembling along the road bed extending direction and a plurality of horizontal drain pipes that are linked together through second coupling assembling and longitudinal drain pipe, the one end that the side slope was kept away from to horizontal drain pipe extends outside the filler layer, longitudinal drain pipe and horizontal drain pipe all seted up a plurality of water holes. This application has the moisture in the discharge road bed, improves road bed life's effect.

Description

Roadbed structure of road and bridge engineering and construction method thereof

Technical Field

The application relates to the field of road and bridge construction technology, in particular to a roadbed structure of road and bridge engineering and a construction method thereof.

Background

With the rapid development of the traffic facility construction in China, the road infrastructure projects are increasing day by day, and particularly with the inclination of national policies, the construction amount of mountain road projects is more prominent.

In southern mountainous areas, rainfall is large, soil layers are mostly red soil layers, and the red soil layers have the characteristics of water absorption softening, strength reduction and easy instability of soil bodies. Meanwhile, due to the influence of the terrain of the mountain area, one side or two sides of the road are generally built according to the mountain, the mountain needs to be excavated and leveled, the excavation volume is large, the transportation of soil is difficult due to the limitation of the traffic of the mountain area, and if the red soil is replaced by the soil with good properties, the transportation volume of the earthwork is greatly increased, and the cost is too high. And the laterite is adopted as a roadbed structure, so that the roadbed structure is unstable and damaged due to the characteristic of the laterite that water is easily absorbed, and the service life of the roadbed is far shorter than the design life.

Disclosure of Invention

In order to discharge moisture in a roadbed and prolong the service life of the roadbed, the application provides a roadbed structure of a road bridge engineering and a construction method thereof.

In a first aspect, the present application provides a roadbed structure of a road bridge engineering, which adopts the following technical scheme:

the utility model provides a roadbed structure of road bridge engineering, includes excavation highway section and fill highway section, be provided with the side slope of echelonment on the fill highway section, the bottom of side slope is provided with the road bed basic unit, be provided with the road bed on road and the basic unit, the road bed includes by supreme fill layer, water barrier and the fine stone concrete layer that sets gradually down, be provided with the drainage mechanism who is used for supplementary fill layer drainage in the fill layer, drainage mechanism includes along the road bed extending direction set gradually and a plurality of longitudinal drain pipes that are connected through first coupling assembling and through second coupling assembling with a plurality of transverse drain pipe that longitudinal drain pipe is linked together, the one end that the side slope was kept away from to transverse drain pipe extends to outside the fill layer, a plurality of water holes of crossing have all been seted up on longitudinal drain pipe and the transverse drain pipe.

Through adopting above-mentioned technical scheme, moisture in the filling layer can be via longitudinal drain pipe and horizontal drain pipe discharge filling layer, reduces filling layer because of absorb water softening, intensity reduction cause the emergence of the condition of road bed unstability, the reducible moisture that gets into fine stone concrete layer of water barrier simultaneously to be favorable to improving the life of road bed.

Optionally, the first connecting assembly includes a connecting pipe for connecting two adjacent longitudinal drainage pipes and a plurality of bolts for connecting the connecting pipe and the longitudinal drainage pipes, two ends of the connecting pipe are respectively sleeved on the outer peripheral sides of the two adjacent longitudinal drainage pipes, and the bolts penetrate through the connecting pipe and are in threaded connection with the longitudinal drainage pipes.

Through adopting above-mentioned technical scheme, when laying vertical drain pipe, can cup joint into vertical drain pipe's one end earlier with the one end of connecting pipe on, then with bolt locking connecting pipe and vertical drain pipe, then insert the one end of another vertical drain pipe and establish into the connecting pipe, reuse bolt locking.

Optionally, the second coupling assembling include with first slider, the cover of lateral drainage pipe week side fixed connection locate the sleeve pipe of lateral drainage pipe week side and be used for connecting the adapting unit of sleeve pipe and lateral drainage pipe, the spliced eye has been seted up to the side that deviates from the side slope of longitudinal drainage pipe, set up on the lateral wall of spliced eye with first slider assorted first spout, the bottom that just is located first spout on the longitudinal drainage pipe has seted up with first slider assorted arc wall, the sleeve pipe passes through spliced eye and longitudinal drainage pipe interference fit.

Through adopting above-mentioned technical scheme, when laying horizontal drain pipe, can insert earlier first slider and establish into first spout, and rotatory horizontal drain pipe when first slider removes to first spout bottom makes first slider cunning move in the arc wall, and the sleeve pipe is inserted simultaneously and is established in advancing the spliced eye and with vertical drain pipe interference fit to fix horizontal drain pipe on vertical drain pipe.

Optionally, the connecting part includes two second sliders fixedly connected to the outer periphery of the sleeve, a third slider fixedly connected to the inner periphery of the sleeve, and an annular plate fixedly connected to an end of the sleeve away from the longitudinal drain pipe, a second sliding groove axially extending along the insertion hole and matching with the second slider is formed in a side wall of the insertion hole, and a third sliding groove axially extending along the transverse drain pipe and matching with the third slider is formed in the outer periphery of the transverse drain pipe.

Through adopting above-mentioned technical scheme, after advancing the arc wall with the rotation of first slider, movable sleeve pipe makes the second slider insert and establishes into the second spout, restricts horizontal drain pipe's rotational degree of freedom, further strengthens horizontal drain pipe and vertical drain pipe's stability of being connected, and the setting of annular plate can seal the drill way in the plug-in hole simultaneously.

Optionally, the sides of the longitudinal drain pipe and the transverse drain pipe are wrapped with permeable geotextiles.

Through adopting above-mentioned technical scheme, the geotechnological cloth that permeates water can reduce and get into the volume of red soil in longitudinal drain pipe and the horizontal drain pipe, does not influence simultaneously that the moisture in the filling layer gets into in longitudinal drain pipe and the horizontal drain pipe.

Optionally, one side of the roadbed far away from the side slope is provided with a road shoulder wall, and tamped clay and sandy soil filler are sequentially filled between the roadbed and the road shoulder wall from low to high.

Through adopting above-mentioned technical scheme, the curb wall can strengthen the stability of filling layer.

Optionally, the side of the road shoulder wall, which faces away from the roadbed, is provided with a plurality of anchor rods for connecting the road shoulder wall with the roadbed.

By adopting the technical scheme, the anchor rod can enhance the stability of the road shoulder wall connected with the filled soil layer, and is also beneficial to reducing the soil instability of the filled soil layer.

Optionally, a cover plate side ditch is arranged on the top surface of the fine stone concrete layer close to the side slope, and a certain width is reserved on two sides of each linear meter of the cover plate side ditch to serve as a drainage hole.

Through adopting above-mentioned technical scheme, the ponding on sluicing and the road surface on the side slope retaining wall can be discharged through the apron side ditch.

Optionally, a gravel layer is arranged below the soil filling layer.

Through adopting above-mentioned technical scheme, the stability of road bed can be increased to the rubble layer.

In a second aspect, the present application provides a method for constructing a roadbed structure of a road bridge engineering, including the following steps:

s1: excavating an original slope surface to form a step-shaped side slope, pouring corresponding retaining walls on the side slope, and meanwhile, carrying out leveling and rolling on a roadbed base layer, wherein the local height difference of the flatness of the roadbed base layer is less than 12 cm;

s2: paving a crushed stone layer on the roadbed base layer, paving a layer of laterite left after the original slope surface is excavated on the crushed stone layer, reserving an anchor rod in the process of paving the laterite, and compacting the laterite;

s3: the longitudinal drain pipes and the transverse drain pipes are wrapped with permeable geotextile, then a plurality of sections of longitudinal drain pipes are laid on a red soil layer, the plurality of sections of longitudinal drain pipes are connected through a first connecting assembly, and the plurality of transverse drain pipes are fixedly connected with the longitudinal drain pipes through a second connecting assembly;

s4: after reserving the anchor rod, paving a layer of red soil on the drainage mechanism to cover the drainage mechanism and compact the red soil to form a filling layer, excavating a road shoulder wall foundation pit on one side of the filling layer far away from the side slope, pouring the road shoulder wall in the foundation pit in sections to form a road shoulder wall, sequentially filling tamping clay and sandy soil filler between the road shoulder wall and the filling layer, compacting the tamping clay and the sandy soil filler, and enabling the top surface of the sandy soil filler to be flush with the top surface of the filling layer;

s5: waterproof boards with the thickness not less than 0.8mm are laid on the filling layer and the sandy soil filler, the waterproof boards are flatly lapped and welded into a whole with the same width as the upper ends of the filling layer and the sandy soil filler, and a fine stone concrete layer is laid on the waterproof boards to form the pavement.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the water in the filling layer can be discharged out of the filling layer through the longitudinal water discharge pipes and the transverse water discharge pipes, so that the occurrence of the instability of the roadbed caused by water absorption softening and strength reduction of the filling layer is reduced, and meanwhile, the water-resisting layer can reduce the water entering the fine stone concrete layer, thereby being beneficial to prolonging the service life of the roadbed;

2. when the longitudinal drain pipes are laid, the connecting pipes can be sleeved on two adjacent longitudinal drain pipes, and then the connecting pipes and the longitudinal drain pipes can be locked by a plurality of bolts;

3. when laying horizontal drain pipe, can remove the sleeve pipe earlier, make the sleeve pipe keep away from vertical drain pipe, and later insert first slider and establish to first spout bottom, rotatory horizontal drain pipe makes first slider slide into the arc wall, then removes the sleeve pipe to insert the second slider and establish into the second spout, sleeve pipe and vertical drain pipe interference fit simultaneously, thereby fix horizontal drain pipe on vertical drain pipe.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is an exploded view of a drainage mechanism according to an embodiment of the present application.

Description of reference numerals: 1. excavating a square road section; 11. a third chute; 12. a road shoulder wall; 13. tamping clay; 14. sandy soil filler; 15. an anchor rod; 16. a cover plate side ditch; 17. a crushed stone layer; 18. a drain pipe; 19. a concrete fixing layer; 2. filling road sections; 3. side slope; 4. a roadbed base layer; 5. a roadbed; 51. filling a soil layer; 52. a water barrier layer; 53. a fine stone concrete layer; 6. a drainage mechanism; 61. a first connection assembly; 611. a connecting pipe; 612. a bolt; 62. a longitudinal drain pipe; 63. a second connection assembly; 631. a first slider; 632. a sleeve; 633. a connecting member; 6331. a second slider; 6332. a third slider; 6333. an annular plate; 64. a transverse drain pipe; 7. inserting holes; 8. a first chute; 9. an arc-shaped slot; 10. a second chute; 20. a retaining wall.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses roadbed structure of road bridge engineering. Referring to fig. 1, a roadbed 5 structure of a road and bridge engineering comprises an excavation section 1 and a filling section 2, wherein a two-stage step-shaped side slope 3 is arranged on the excavation section 1, the slope of the side slope 3 is constructed by adopting a ratio of 1:0.75, a retaining wall 20 for reinforcing the side slope 3 is poured on the side slope 3, and a water drain pipe 18 is obliquely arranged on the retaining wall 20. The lower extreme department of side slope 3 is provided with roadbed base 4, be provided with road bed 5 on roadbed base 4, roadbed 5 comprises filler 51, water barrier 52 and fine stone concrete layer 53, filler 51 sets up on roadbed base 4 top surface, and filler 51 compresses tightly closely knit by the laterite that excavation highway section 1 formed and forms, water barrier 52 sets up on filler 51 top surface, fine stone concrete layer 53 sets up on water barrier 52 top surface, fine stone concrete layer 53 is the road surface promptly. Meanwhile, the side face, far away from the side slope 3, of the roadbed 5 is set to be an inclined face, and the inclined face is constructed according to the inclination of 1: 1.5. In addition, a drainage mechanism 6 for assisting the drainage of the filling layer 51 is arranged in the filling layer 51, the drainage mechanism 6 consists of a plurality of sections of communicated longitudinal drainage pipes 62 and a plurality of transverse drainage pipes 64 communicated with the longitudinal drainage pipes 62, in this embodiment, the longitudinal drain pipe 62 is a PVC pipe having a square cross-sectional shape, the lateral drain pipe 64 is a PVC pipe having a circular cross-sectional shape, the longitudinal drain pipe 62 is provided in a side of the filling 51 adjacent to the side slope 3, and the longitudinal drain pipes 62 at two adjacent ends are communicated with each other through a first connecting component 61, the transverse drain pipe 64 is communicated with the side surface of the longitudinal drain pipe 62, which is far away from the side slope 3, through a second connecting component 63, and the end of the transverse drain pipe 64 far away from the longitudinal drain pipe 62 extends to the outside of the filling layer 51, and the roadbed base 4 outside the filling layer 51 is obliquely arranged, so that the moisture discharged by the transverse drain pipe 64 does not pool at the roadbed 5. Meanwhile, a plurality of water through holes are formed in the longitudinal drain pipe 62 and the transverse drain pipe 64, and the longitudinal drain pipe 62 and the transverse drain pipe 64 are further coated with permeable geotextiles, so that water in the filling layer 51 can permeate the permeable geotextiles and enter the longitudinal drain pipe 62 and the transverse drain pipe 64 through the water through holes, and then the filling layer 51 is discharged, and the service life of the roadbed 5 is prolonged.

Referring to fig. 1 and 2, the first connection assembly 61 is composed of a connection pipe 611 and a plurality of bolts 612, two ends of the connection pipe 611 are respectively sleeved on one end of two adjacent longitudinal drainage pipes 62 close to each other, a threaded end of the bolt 612 passes through the connection pipe 611 and is in threaded connection with the longitudinal drainage pipe 62, and the plurality of bolts 612 are uniformly distributed along the outer periphery of the connection pipe 611. In the present embodiment, the connection pipe 611 and the bolts 612 are made of PVC material, and the number of the bolts 612 is four.

Referring to fig. 1 and 2, the second connecting assembly 63 includes a sleeve 632, a first slider 631, and a connecting member 633 for assisting the sleeve 632 to be fixed, the side of the longitudinal drain pipe 62 away from the side slope 3 is provided with an insertion hole 7 for the horizontal drain pipe 64 to be inserted, the side wall of the insertion hole 7 is provided with a first sliding groove 8 extending axially along the insertion hole 7, the first slider 631 can slide along the first sliding groove 8 and be connected to the longitudinal drain pipe 62, the longitudinal drain pipe 62 is provided with an arc-shaped groove 9 at the bottom of the first sliding groove 8, the arc-shaped groove 9 is communicated with the first sliding groove 8, and the first slider 631 can slide along the arc-shaped groove 9 and be connected to the longitudinal drain pipe 62. The connecting component 633 comprises a ring-shaped plate 6333, a third slider 6332 and two second sliders 6331, the sleeve 632 is sleeved on the peripheral side of the transverse drain pipe 64, the ring-shaped plate 6333 and the end face of the sleeve 632, which is far away from the first slider 631, are fixedly connected, the two second sliders 6331 are symmetrically arranged on the peripheral side of the sleeve 632, the two second sliders 6331 are fixedly connected with the peripheral side of the sleeve 632, which is close to the first slider 631, two second sliding grooves 10 matched with the second sliders 6331 are formed on the side wall of the inserting hole 7, the third slider 6332 is fixedly connected with the inner peripheral side of the sleeve 632, a third arc groove matched with the third slider 6332 is formed on the peripheral side of one end of the transverse drain pipe 64, which is close to the longitudinal drain pipe 62, and the third slider 6332 can be connected with the transverse drain pipe 64 in a sliding manner through. Therefore, when the transverse drain pipe 64 is installed, the sleeve 632 can be moved first, the sleeve 632 is far away from the first sliding block 631, then the first sliding block 631 is inserted into the bottom of the first sliding groove 8 and the transverse drain pipe 64 is rotated, the first sliding block 631 slides into the arc-shaped groove 9, and the first sliding block 631 limits the freedom of movement of the transverse drain pipe 64. Then, the sleeve 632 is moved to insert the second sliding block 6331 into the second sliding groove 10, so that the sleeve 632 is inserted into the insertion hole 7, and the sleeve 632 is in interference fit with the longitudinal drain pipe 62 through the insertion hole 7, so that the sleeve 632 can limit the rotational degree of freedom of the transverse drain pipe 64, thereby fixing the transverse drain pipe 64 on the longitudinal drain pipe 62. At this time, the annular plate 6333 is attached to the side surface of the longitudinal drain pipe 62 at the opening of the insertion hole 7, and forms a sealing effect on the insertion hole 7.

Referring to fig. 1, a shoulder wall 12 is poured in a section on one side of the roadbed 5 far from the side slope 3, in the embodiment, the shoulder wall 12 is an inclined shoulder wall 12, the inner wall and the outer wall of the shoulder wall 12 are both constructed at an inclination of 1:0.25, rammed clay 13 and sandy soil filler 14 are sequentially filled between the shoulder wall 12 and the roadbed 5 from bottom to top, meanwhile, a plurality of anchor rods 15 are arranged on the side of the shoulder wall 12 far away from the filling layer 51, and one ends of the anchor rods 15 sequentially penetrate through the shoulder wall 12, the sandy soil filler 14 and the rammed clay 13 and extend into the filling layer 51. In addition, a concrete fixing layer 19 is further poured on the surface of the roadbed 5 at the shoulder wall 12 to further enhance the stability of the roadbed 5.

Referring to fig. 1, a gravel layer 17 is laid on the top surface of the roadbed 4 and below the fill layer 51 to increase the stability of the roadbed 5, and a cover plate gutter 16 is provided on the top surface of the fine stone concrete layer 53 and below the retaining wall 20, and a certain width is reserved on both sides of each linear meter of the cover plate gutter 16 as a drainage hole, in this embodiment, the width reserved in each linear meter of the cover plate gutter 16 is two centimeters.

The implementation principle of the roadbed structure of the road bridge engineering is as follows: the gravel layer 17 enhances the stability of the roadbed 5, the water in the fill layer 51 can be discharged out of the fill layer 51 through the longitudinal water discharge pipes 62 and the transverse water discharge pipes 64 which are connected with each other, and the shoulder walls 12 and the concrete fixing layer 19 can further enhance the stability of the roadbed 5, thereby prolonging the service life of the roadbed 5.

The embodiment of the application also discloses an implementation method of the roadbed structure of the road bridge engineering, which comprises the following steps:

s1: excavating an original slope surface to form a side slope 3 in a two-stage step shape and a roadbed base layer 4, then embedding a water drain pipe 18 on the side slope 3, pouring a retaining wall 20, removing grass and tree roots on the roadbed base layer 4, and flattening the roadbed base layer 4 to ensure that the local height difference of the flatness of the roadbed base layer 4 is less than twelve centimeters;

s2: laying a crushed stone layer 17 on the roadbed base layer 4, wherein the thickness of the crushed stone layer 17 is twenty-one centimeters, then laying a layer of laterite left after the original slope surface is excavated on the top surface of the crushed stone layer 17, reserving an anchor rod 15 in the process of laying the laterite, and compacting the compacted laterite to form a laterite layer;

s3: after each section of longitudinal drain pipe 62 and the plurality of transverse drain pipes 64 are wrapped with the permeable geotextile, the longitudinal drain pipes 62 are laid on a red soil layer, the longitudinal drain pipes 62 at two adjacent ends are connected with each other through the connecting pipe 611 and the bolt 612, then the first slide block 631 is inserted into the bottom of the first sliding groove 8, the transverse drain pipes 64 are rotated, then the sleeve pipe 632 is moved, the second slide block 6331 is inserted into the second sliding groove 10, the sleeve pipe 632 is knocked to enable the annular plate 6333 to be tightly attached to the side surface of the longitudinal drain pipe 62, then the red soil is laid and covered with the drainage mechanism 6, and the dense red soil is compacted to form a soil filling layer 51;

s4: excavating a foundation pit of the road shoulder wall 12 on an inclined plane of the filling layer 51 far away from the side slope 3, and pouring in sections in the foundation pit to form a continuous road shoulder wall 12, wherein the transverse drain pipe 64 penetrates through the road shoulder wall 12 and extends to one side of the road shoulder wall 12 far away from the filling layer 51, meanwhile, a layer of compacted clay 13 is firstly paved and compacted between the road shoulder wall 12 and the filling layer 51, a layer of sandy soil filler 14 is paved and compacted on the top surface of the compacted clay 13, and the top surface of the sandy soil filler 14 is flush with the top surface of the filling layer 51;

s5: the method comprises the steps of paving a waterproof board with the thickness not less than 0.8mm on the top surface of a filling layer 51, flatly lapping and welding the waterproof boards into a whole, enabling the waterproof board to cover the filling layer 51 and the top surface of a sandy soil filler 14, then paving a fine stone concrete layer 53 on the waterproof board to form a road surface, and meanwhile paving a concrete fixing layer 19 on the surface of the roadbed 5 at a position of a road shoulder wall 12 to further enhance the stability of the roadbed 5.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a roadbed structure of road bridge engineering, includes excavation highway section (1) and fill highway section (2), be provided with side slope (3) of echelonment on fill highway section (2), its characterized in that: a roadbed base layer (4) is arranged at the bottom of the side slope (3), a roadbed (5) is arranged on the roadbed base layer (4), the roadbed (5) comprises a filling layer (51), a water-resisting layer (52) and a fine stone concrete layer (53) which are arranged from bottom to top in sequence, a drainage mechanism (6) for assisting the drainage of the filling layer (51) is arranged in the filling layer (51), the drainage mechanism (6) comprises a plurality of longitudinal drainage pipes (62) which are sequentially arranged along the extension direction of the roadbed (5) and connected through a first connecting component (61) and a plurality of transverse drainage pipes (64) which are communicated with the longitudinal drainage pipes (62) through a second connecting component (63), one end of the transverse drain pipe (64) far away from the side slope (3) extends to the outside of the soil filling layer (51), and a plurality of water passing holes are formed in the longitudinal drain pipe (62) and the transverse drain pipe (64).

2. The roadbed structure of the road bridge engineering, according to claim 1, characterized in that: the first connecting assembly (61) comprises a connecting pipe (611) used for connecting two adjacent longitudinal drainage pipes (62) and a plurality of bolts (612) used for connecting the connecting pipe (611) and the longitudinal drainage pipes (62), wherein two ends of the connecting pipe (611) are sleeved on the outer peripheral sides of the two adjacent longitudinal drainage pipes (62), and the bolts (612) penetrate through the connecting pipe (611) and are in threaded connection with the longitudinal drainage pipes (62).

3. The roadbed structure of the road bridge engineering, according to claim 1, characterized in that: second coupling assembling (63) include with lateral drainage pipe (64) week side fixed connection's first slider (631), cover are located lateral drainage pipe (64) week side on sleeve pipe (632), be used for connecting sleeve pipe (632) and lateral drainage pipe (64) adapting unit (633), spliced eye (7) have been seted up to the side that deviates from side slope (3) of longitudinal drainage pipe (62), seted up on the lateral wall of spliced eye (7) with first slider (631) assorted first spout (8), on longitudinal drainage pipe (62) and be located the bottom of first spout (8) seted up with first slider (631) assorted arc wall (9), sleeve pipe (632) are through spliced eye (7) and longitudinal drainage pipe (62) interference fit.

4. A roadbed structure of road bridge engineering according to claim 3, wherein: the connecting part (633) comprises two second sliding blocks (6331) fixedly connected with the outer peripheral side of the sleeve (632), a third sliding block (6332) fixedly connected with the inner peripheral side of the sleeve (632), and an annular plate (6333) fixedly connected with one end, far away from the longitudinal drain pipe (62), of the sleeve (632, a second sliding groove (10) axially extending along the inserting hole (7) and matched with the second sliding blocks (6331) is formed in the side wall of the inserting hole (7), and a third sliding groove (11) axially extending along the transverse drain pipe (64) and matched with the third sliding block (6332) is formed in the outer peripheral side of the transverse drain pipe (64).

5. The roadbed structure of the road bridge engineering, according to claim 1, characterized in that: the sides of the longitudinal drain pipe (62) and the transverse drain pipe (64) are wrapped with permeable geotextile.

6. The roadbed structure of the road bridge engineering, according to claim 1, characterized in that: one side of the roadbed (5) far away from the side slope (3) is provided with a road shoulder wall (12), and tamped clay (13) and sandy soil filler (14) are sequentially filled between the roadbed (5) and the road shoulder wall (12) from low to high.

7. The roadbed structure of the road bridge engineering, according to claim 6, characterized in that: the side of the road shoulder wall (12) departing from the roadbed (5) is provided with a plurality of anchor rods (15) for connecting the road shoulder wall (12) with the roadbed (5).

8. The roadbed structure of the road bridge engineering, according to claim 1, characterized in that: and a cover plate side ditch (16) is arranged on the top surface of the fine stone concrete layer (53) close to the side slope (3), and a certain width is reserved on two sides of each linear meter of the cover plate side ditch (16) to serve as a drainage hole.

9. A roadbed (5) structure of a road and bridge construction according to claim 1, characterized in that: and a gravel layer (17) is arranged below the soil filling layer (51).

10. The construction method of a roadbed structure of a road bridge engineering according to any one of claims 1 to 9, wherein: the method comprises the following steps:

s1: excavating an original slope surface to form a step-shaped side slope (3), pouring a corresponding retaining wall (20) on the side slope (3), and meanwhile, carrying out leveling and rolling on a roadbed base layer (4), wherein the local height difference of the flatness of the roadbed base layer (4) is less than 12 cm;

s2: paving a crushed stone layer (17) on the roadbed base layer (4), paving a layer of residual laterite obtained by excavating the original slope surface on the crushed stone layer (17), reserving an anchor rod (15) in the process of paving the laterite, and compacting the laterite;

s3: the longitudinal drain pipes (62) and the transverse drain pipes (64) are wrapped with permeable geotextile, then a plurality of sections of longitudinal drain pipes (62) are laid on a red soil layer, the plurality of sections of longitudinal drain pipes (62) are connected through a first connecting assembly (61), and the plurality of transverse drain pipes (64) are fixedly connected with the longitudinal drain pipes (62) through a second connecting assembly (63);

s4: after the anchor rods (15) are reserved, paving a layer of red soil on the drainage mechanism (6) to cover the drainage mechanism (6) and compacting the red soil to form a filling layer (51), simultaneously excavating a foundation pit of the road shoulder wall (12) on one side of the filling layer (51) far away from the side slope (3), pouring the foundation pit in sections to form the road shoulder wall (12), sequentially filling tamping clay (13) and sandy soil filler (14) between the road shoulder wall (12) and the filling layer (51), compacting the tamping clay (13) and the sandy soil filler (14), and enabling the top surface of the sandy soil filler (14) to be flush with the top surface of the filling layer (51);

s5: waterproof boards with the thickness not less than 0.8mm are paved on the filling layer (51) and the sandy soil filler (14), the waterproof boards are flatly lapped and welded into a whole with the same width as the upper ends of the filling layer (51) and the sandy soil filler (14), and a fine stone concrete layer (53) is paved on the waterproof boards to form a road surface.