A new and old road widening structure and construction method

Abstract

The invention discloses a new and old road widening structure and a construction method, comprising an original road, wherein the original road comprises an original roadbed and an original road surface arranged above the original roadbed, an original drainage system is arranged in the original roadbed, the original drainage system comprises a plurality of longitudinal drainage pipes and transverse drainage pipes, the transverse drainage pipes are connected with the longitudinal drainage pipes, the longitudinal drainage pipes are connected with an external drainage ditch, a new road is expanded on one side of the original road, the new road comprises a new roadbed and a new road surface, a connecting drainage piece is arranged between the new roadbed and the original roadbed, the connecting drainage piece is used to strengthen the connection between the original roadbed and the new roadbed, and is also used to provide a drainage path for the new roadbed and the connection between the new roadbed and the original roadbed, the structure realizes the connection between the new and old roads and connects the drainage inside the new and old roads, thereby improving the overall bearing capacity and service life of the roads; a construction method is also provided, which improves the construction efficiency and simplifies the construction process.

Description

Technical Field

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

[0002] With economic development and the increasing traffic volume, many highways in my country need to be widened. Road widening can make people's travel more convenient and relieve traffic pressure. However, the existing road widening construction technology often involves excavating steps to connect the old and new roads.

[0003] The road consists of two parts: the roadbed and the pavement. The roadbed, as the foundation of the road pavement, bears the diffusion stress of the traffic load and the gravity of the pavement structure layer on the one hand, and is affected by various natural factors on the other hand, among which water is one of the most important factors. Therefore, it is necessary to do a good job of roadbed drainage. It is extremely important to ensure that the roadbed is always dry, solid and stable. Therefore, a drainage system is provided inside the roadbed to drain the water inside the roadbed. For example, the patent application number is 201821581200.0, and the name is a drainage roadbed structure for highway construction projects; another example is the patent application number 201820608602.9, and the name is a rapid drainage roadbed structure. The roadbeds of the above existing patents all have drainage systems inside.

[0004] For example, the patent application number is 201510365128.2, and its name is a roadbed structure and construction method for road widening, which saves land, reduces demolition, and reduces construction work surface. However, it does not make any integrated improvements to the drainage system inside the original road. The new road has a different settlement from the original road, resulting in longitudinal cracks in the road, affecting the overall bearing capacity and service life of the road. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a new and old road widening structure, which realizes the connection between the new and old roads and connects the drainage inside the new and old roads, thereby improving the overall bearing capacity and service life of the roads; and also provides a construction method to improve construction efficiency and simplify the construction process.

[0006] To achieve the above-mentioned purpose, the present invention provides a new and old road widening structure, including an original road, wherein the original road includes an original roadbed and an original road surface arranged above the original roadbed, an original drainage system is arranged in the original roadbed, and the original drainage system includes multiple longitudinal drainage pipes and transverse drainage pipes, the transverse drainage pipes are connected to the longitudinal drainage pipes, and the longitudinal drainage pipes are connected to external drainage ditches. A new road is expanded on one side of the original road, and the new road includes a new roadbed and a new road surface. A connecting drainage piece is arranged between the new roadbed and the original roadbed, and the connecting drainage piece is used to strengthen the connection between the original roadbed and the new roadbed, and is also used to provide a drainage path for the new roadbed and the connection between the new roadbed and the original roadbed.

[0007] Furthermore, the connecting drainage parts include multiple groups of reinforcing anchor rods installed on the original roadbed, the reinforcing anchor rods include at least two reinforcing anchor rods, and the reinforcing anchor rods are jointly mounted on a base with a drainage path. Adjacent bases are spliced ​​with each other, and the drainage paths are connected step by step from top to bottom and then connected to the drainage ditch through additional pipes. Multiple bases are gradually erected with stabilizing frames from bottom to top, and at least one layer of transverse supports in the stabilizing frame has a first drainage pipe built in to connect with the drainage path.

[0008] Furthermore, the upper end of the base is rectangular and the lower end is an inverted right triangle. The base is provided with an inclined panel facing the end face of the original roadbed, and a plurality of first inclined seepage holes are provided on the inclined panel. The first oblique seepage holes are provided with multiple layers of filtration. The base is provided with a vertical drainage board facing the end face of the new roadbed, and the bottom of the vertical drainage board is connected to the bottom of the inclined panel. The vertical drainage board is provided with second oblique seepage holes facing the end face of the new roadbed, and the second oblique seepage holes are provided with multiple layers of filtration.

[0009] Furthermore, the stabilizing frame also includes a guide member arranged on a transverse bracket with a first drainage pipe built in, a vertical support rod and an oblique support rod supporting and connecting the transverse bracket, a water inlet connected to the first drainage pipe is arranged on the periphery of the transverse bracket, a guide plate is arranged adjacent to the water inlet, the guide plate is arc-shaped, and a filter portion is arranged between the guide plate and the water inlet.

[0010] Furthermore, the new pavement includes a prefabricated base layer, a surface layer arranged on the prefabricated base layer, and a cushion layer arranged on the lower end surface of the prefabricated base layer. A reinforced connection portion is provided between the joint of the prefabricated base layer and the cushion layer. A drainage ditch is arranged in the prefabricated base layer, and the drainage ditch is connected to the longitudinal drainage pipe of the original drainage system. A connecting piece is provided between the prefabricated base layer and the original pavement base layer, and the connecting piece is used for connecting the prefabricated base layer and the original pavement base layer.

[0011] Furthermore, the prefabricated base layer includes a plurality of main base blocks, adjacent main base blocks are spliced ​​and connected by reinforced connecting parts, the main base blocks all include a stable waterproof substrate, a pointed cone protrusion is provided at the center of the stable waterproof substrate and the pointed cone protrusion is inclined toward a drainage groove, the drainage groove is arranged on the stable waterproof substrate, the drainage direction of the drainage groove is unidirectional drainage to the left and right, the stable waterproof substrate is provided with a water inlet pipe and a drainage pipe corresponding to the drainage groove, a permeable substrate is laid on the stable waterproof substrate, and the bottom of the permeable substrate is in contact with the pointed cone protrusion.

[0012] Furthermore, the stable waterproof substrate includes a peripheral frame, a first C-shaped groove is provided at the front end of the peripheral frame, a triangular block is provided at the upper part of the front end, a guide convex strip is provided at the bottom of the triangular block, a second C-shaped groove is provided at the rear end of the peripheral frame corresponding to the first C-shaped groove, and a guide groove is provided at the upper end of the second C-shaped groove corresponding to the guide convex strip, and the first C-shaped groove and the second C-shaped groove are combined to form a transverse reinforcement channel;

[0013] The left end of the peripheral frame is provided with a recessed end, the right end is provided with a raised end, and the raised end and the recessed end are combined to form a vertical reinforcement channel, and the cushion layer is vertically penetrated with reinforcing ribs corresponding to the vertical reinforcement channel;

[0014] The reinforced connection part is a horizontal reinforcement channel and a vertical reinforcement channel in which waterproof mortar is poured.

[0015] Furthermore, the connecting piece includes a triangular groove formed by cutting the original pavement base, a waterproof geotextile is laid in the triangular groove, an adjacent base block is spliced ​​at the triangular groove, a triangular end is provided on the end face of the adjacent base block facing the triangular groove, and an oblique grouting hole is provided on the triangular end, a hollow connecting rod is obliquely inserted into the original pavement base corresponding to the oblique grouting hole, concrete is poured in the hollow connecting rod and the oblique grouting hole, and a guide plate is welded on the upper end of the hollow connecting rod, and a vertical drainage is provided on the adjacent base block corresponding to the longitudinal pipe.

[0016] The present invention also provides a construction method for a new and old road widening structure, comprising the following steps:

[0017] S1: Determine whether the original road surface, roadbed and drainage system are damaged or have problems. According to the extent of the problems, determine whether the road widening standards are met after renovation. If the standards are met, proceed with the road widening construction;

[0018] S2: After dismantling the auxiliary facilities on the side of the original roadbed that needs to be widened, the slope is repaired, and an extended drainage pipe is installed on the longitudinal drainage pipe on the side that needs to be widened. A connection port connected to the new drainage system is reserved on the extended drainage pipe;

[0019] S3: After the repair, reinforced anchor bolts are driven into the slope from bottom to top step by step and the base is installed. The drainage paths between adjacent bases are connected to each other, and the drainage port of the base at the bottom is connected to the reserved connection port. The two drainage paths of the base are checked for smooth drainage and no leakage. If there is any problem, repair it and proceed to the next stage of construction;

[0020] S4: After determining that the paving of the base drainage roadbed meets the standards, stabilizing frames are set up layer by layer from bottom to top and filled step by step simultaneously, wherein the transverse supports in at least two layers of stabilizing frames are replaced with transverse supports having a first drainage pipe and guide members are installed between the transverse supports.

[0021] S5: After the new roadbed is constructed, a cushion layer is laid on the new roadbed, and a prefabricated base layer is installed on the cushion layer. The prefabricated base layer is spliced ​​to form a one-way drainage or a two-way drainage. The cushion layer and the prefabricated base layer are reinforced by strengthening the connection. The prefabricated base layer is then connected to the original road base layer through a connector, and then the surface layer is laid on the prefabricated base layer.

[0022] S6: After the surface layer is laid, a drainage channel is built on the new roadbed slope corresponding to the drainage pipe in the prefabricated base layer and the horizontal support of the extended slope, and greening is planted on the roadbed slope.

[0023] Beneficial effects: 1. This application combines the original drainage system inside the original road to widen the new road without destroying the drainage method of the original road to the greatest extent. At the same time, the new road has a new drainage system inside. The new drainage system is combined with the original drainage system to ensure the discharge of seepage water from the new and old roads and reduce diseases caused by water.

[0024] 2. By connecting the original roadbed and the new roadbed horizontally through the connection base, stabilizing frame, etc., the integrity of the new and old roadbeds can be enhanced, the settlement difference at the junction of the new and old roadbeds can be reduced, and the problem of longitudinal cracks that are prone to occur at the junction of the new and old road surfaces can be solved.

[0025] 3. At the same time, the present application adopts a prefabricated base layer on the new road surface, which provides drainage while ensuring that the base layer has the corresponding bearing capacity, realizes the connection between the prefabricated base layer and the cushion layer by strengthening the connection part, and ensures the connection between the new and old road surfaces by connecting parts.

[0026] 4. This application also provides a construction method to facilitate construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the widening structure of the new and old roads;

[0028] Figure 2 for Figure 1 A partial enlarged schematic diagram of the interior of part A;

[0029] Figure 3 for Figure 1 An enlarged schematic diagram of part B;

[0030] Figure 4 is a schematic diagram of the base;

[0031] Figure 5 is a schematic diagram of a flow guide;

[0032] Figure 6 This is a schematic diagram of the prefabricated base;

[0033] Figure 7 for Figure 6 Schematic diagram from another perspective;

[0034] Figure 8 Schematic diagram of the vertical reinforcement channel.

[0035] Figure numerals: 1. original road; 2. original roadbed; 3. original road surface; 4. original drainage system; 41. longitudinal drainage pipe; 42. transverse drainage pipe; 43. drainage ditch; 5. new road; 6. new roadbed; 7. new road surface; 8. connecting drainage parts; 81. reinforcing anchor rod; 82. base; 9. stabilizing frame; 91. transverse support; 92. vertical support rod; 93. oblique support rod; 94. guide piece; 941. guide plate; 942. filter; 95. first drainage pipe; 10. prefabricated base; 101. main base block; 102. stabilizing frame Waterproof substrate; 103, pointed cone protrusion; 104, drainage groove; 105, permeable substrate; 106, water inlet pipe; 107, drainage pipe; 11, cushion layer; 12, surface layer; 13, reinforced connection part; 14, connector; 15, outer frame; 151, first C-shaped groove; 152, triangular block; 153, second C-shaped groove; 154, horizontal reinforcement channel; 155, vertical reinforcement channel; 156, raised end; 157, recessed end; 16, triangular groove; 17, adjacent base block; 18, triangular end; 19, hollow connecting rod; 20, guide plate. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0037] Refer to Figure 1-Figure 8As shown, the present application provides a new and old road widening structure, including an original road including an original roadbed 2 and an original road surface 3 arranged above the original roadbed 2, an original drainage system 4 is arranged in the original roadbed 2, the original drainage system 4 includes a plurality of longitudinal drainage pipes 41 and transverse drainage pipes 42, the transverse drainage pipes 42 are connected to the longitudinal drainage pipes 41, and the longitudinal drainage pipes 41 are connected to the external drainage ditch 43, and a new road 5 is expanded on one side of the original road 1 while retaining the original drainage system 4 inside the original roadbed 2, the new road 5 includes a new roadbed 6 and a new road surface 7, a connecting drainage component 8 is arranged between the new roadbed 6 and the original roadbed 2, the connecting drainage component 8 is interconnected with the original drainage system 4, the connecting drainage component 8 includes a plurality of groups of reinforcing anchor rods 81 installed on the original roadbed 2, the reinforcing anchor rods 81 include at least two reinforcing anchor rods 81, the reinforcing anchor rods 81 are jointly sleeved with a base 82 with a drainage roadbed, and the base 82 is fixed on the slope of the original roadbed 2 by the reinforcing anchor rods 81. The upper end of the base 82 is rectangular and the lower end is an inverted right triangle. The end face of the base 82 facing the original roadbed 2 is provided with an inclined panel, and a plurality of first inclined water seepage holes are provided on the inclined panel. The first inclined water seepage holes are provided with multi-layer filters. The end face of the base 82 facing the new roadbed 6 is provided with a vertical drainage board, and the bottom of the vertical drainage board is connected to the bottom of the inclined panel. The end face of the vertical drainage board facing the new roadbed 6 is provided with a second inclined water seepage hole. The water leaking from the junction of the original roadbed 2 and the new roadbed 6 is discharged through the base 82. The first water seepage hole and the second water seepage hole are provided with multi-layer filters, and filters including filter nets, filter cotton, etc. with filtering functions can be applied.

[0038] Refer to Figure 1 As shown, in order to enhance the anti-settling capability of the new roadbed 6, a stabilizing frame 9 is set up step by step from bottom to top on multiple bases 82. The stabilizing frame 9 includes a transverse support 91, a flow guide 94, a vertical support rod 92 and an oblique support rod 93 supporting and connecting the transverse support 91. The flow guide 94 is arranged between the transverse supports 91 with a first drainage pipe 95 built in. The first drainage pipe 95 is inclined from the middle to both ends so that both ports can be discharged. One port is connected to the drainage roadbed of the base 82, and the other section is discharged through the slope of the new roadbed 6. A water inlet connected to the first drainage pipe 95 is arranged on the periphery of the transverse support 91. The flow guide 94 is a flow guide plate 941 arranged at an adjacent water inlet. The flow guide plate 941 is arc-shaped and a filter 942 is arranged between the flow guide plate 941 and the water inlet. The filter 942 is a filter net or filter cotton to avoid clogging the water inlet.

[0039] Refer to Figure 6As shown, the new pavement 7 includes a prefabricated base, a surface layer 12 arranged on the prefabricated base, and a cushion layer 11 arranged on the lower end surface of the prefabricated base. The prefabricated base includes a plurality of main blocks 101, and the adjacent main blocks 101 are spliced ​​and connected by a reinforcing connection 13. The main blocks 101 all include a stable waterproof substrate 102, and a pointed cone protrusion 103 is provided at the center of the stable waterproof substrate 102, and the pointed cone protrusion 103 is inclined toward a drainage groove 104. The drainage groove 104 is arranged on the stable waterproof substrate 102, and the drainage groove 104 is rectangular and the bottom of the drainage groove 104 is inclined to achieve a single flow direction. By different splicing of the main blocks 101, it is possible to discharge the seepage water to the longitudinal drainage pipe 41 or lay the main blocks 101 from the middle to both sides to achieve left and right discharge, the left discharge to the longitudinal drainage pipe 41, and the right discharge from the new slope. The flow direction of the water can be adjusted by providing slopes with different slopes at the bottom of the drainage groove 104. A water inlet pipe 106 and a drainage pipe 107 are provided corresponding to the drainage groove 104. A permeable substrate 105 is laid on the stable waterproof substrate 102. The bottom of the permeable substrate 105 fits with the pointed cone protrusion 103, so that when the water penetrates into the permeable substrate 105, it is affected by the pointed cone protrusion 103 and seeps into the drainage groove 104. The stable waterproof substrate 102 includes an outer frame 15, a first C-shaped groove 151 is provided at the front end of the outer frame 15, and a triangular block 152 is provided at the upper part of the front end, a guide convex strip is provided at the bottom of the triangular block 152, a second C-shaped groove 153 is provided at the rear end of the outer frame 15 corresponding to the first C-shaped groove 151, and a guide groove is provided at the upper end of the second C-shaped groove 153 corresponding to the guide convex strip, the first C-shaped groove 151 and the second C-shaped groove 153 are combined to form a transverse reinforcement channel 154, a recessed end 157 is provided at the left end of the outer frame 15, a raised end 156 is provided at the right end, and the raised end 156 and the recessed end 157 are combined to form a vertical reinforcement channel 155, and the cushion layer 11 is vertically penetrated with reinforcing ribs corresponding to the vertical reinforcement channel 155, the reinforced connection part 13 is a transverse reinforcement channel 154 and a vertical reinforcement channel 155 in which waterproof mortar is poured, and the connection between the prefabricated base layers and the connection with the cushion layer 11 is strengthened by the reinforced connection part 13.

[0040] like Figure 3 As shown, in order to strengthen the connection strength between the prefabricated base layer and the original pavement 3 base layer, a connector 14 is provided, including a triangular groove 16 formed by cutting the original pavement 3 base layer, a waterproof geotextile is laid in the triangular groove 16, an adjacent base block 17 is spliced ​​at the triangular groove 16, and the end face of the adjacent base block 17 facing the triangular groove 16 is provided with a triangular end 18 and the triangular end 18 is provided with an oblique grouting hole, a hollow connecting rod 19 is obliquely inserted into the original pavement 3 base layer corresponding to the oblique grouting hole, and concrete is poured in the hollow connecting rod 19 and the oblique grouting hole to realize the connection between the adjacent base block 17 and the original pavement 3 base layer, the adjacent base block 17 has the same structure as the main base block 101, but the drainage ditch 104 is differently constructed, and the drainage ditch 43 of the adjacent base block 17 is connected to the longitudinal drainage pipe 41 for vertical drainage.

[0041] The present invention also provides a construction method for a new and old diversion and widening structure, comprising the following steps: determining whether the original road surface 3, the original roadbed 2 and the original drainage system 4 of the original road 1 have problems such as damage and disease, determining whether the road widening standards are met after renovation according to the degree of the problems, and starting the road widening construction if the standards are met;

[0042] After dismantling the auxiliary facilities on the side of the original roadbed 2 that needs to be widened, the slope is repaired, and an extended drainage pipe is installed on the longitudinal drainage pipe 41 on the side that needs to be widened, and a connection port connected to the new drainage system is reserved on the extended drainage pipe;

[0043] On the repaired slope, reinforced anchor rods 81 are driven step by step from bottom to top and bases 82 are installed. The drainage paths between adjacent bases 82 are connected to each other, and the drainage port of the lowest base 82 is connected to the reserved connection port. The drainage of the two drainage paths of the base 82 is verified to be smooth and leak-free. If the problem is repaired, the next stage of construction is entered;

[0044] After determining that the drainage roadbed of the base 82 meets the standards, the stabilizing frames 9 are erected layer by layer from bottom to top and filled step by step simultaneously, wherein the transverse supports 91 in at least two layers of the stabilizing frames 9 are replaced with transverse supports 91 with first drainage pipes 95 and guide members 94 are installed between the transverse supports 91, and the guide members 94 include guide plates 941, which are arc-shaped and have filter portions 942 between the guide plates 941 and the water inlet.

[0045] After the construction of the new roadbed 6 is completed, a cushion layer 11 is laid on the new roadbed 6, and a prefabricated base layer is installed on the cushion layer 11. The prefabricated base layers are spliced ​​to form one-way drainage or two-way drainage, and the cushion layer 11 and the prefabricated base layer 10 are reinforced by strengthening the connection. The prefabricated base layer is then connected to the base layer of the original road 1 through the connector 14, and then a surface layer 12 is laid on the prefabricated base layer. The surface layer 12 is set to be permeable, which can better achieve drainage of the new and old road surfaces.

[0046] After the surface layer 12 is laid, a drainage channel is built on the slope of the new roadbed 6 corresponding to the drainage pipe 107 in the prefabricated base layer and the transverse support 91 of the extended slope, and greenery is planted on the roadbed slope.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A new and old road widening structure, comprising an original road (1), the original road (1) comprising an original roadbed (2) and an original road surface (3) arranged above the original roadbed (2), an original drainage system (4) arranged in the original roadbed (2), the original drainage system (4) comprising a plurality of longitudinal drainage pipes (41) and transverse drainage pipes (42), the transverse drainage pipes (42) being connected to the longitudinal drainage pipes (41), the longitudinal drainage pipes (41) being connected to an external drainage ditch (43), characterized in that: A new road (5) is expanded on one side of the original road (1), and the new road (5) includes a new roadbed (6) and a new road surface (7). A connecting drainage member (8) is provided between the new roadbed (6) and the original roadbed (2), and the connecting drainage member (8) is used to strengthen the connection between the original roadbed (2) and the new roadbed (6), and is also used to provide a drainage path at the connection between the new roadbed (6) and the original roadbed (2); The connecting drainage member (8) comprises a plurality of groups of reinforcing anchor rods (81) installed on the original roadbed (2), the reinforcing anchor rods (81) comprising at least two reinforcing anchor rods (81), the reinforcing anchor rods (81) being collectively sleeved with a base (82) having a drainage path, adjacent bases (82) being spliced ​​with each other and the drainage path being connected step by step from top to bottom and then connected to the drainage ditch (43) through an additional pipe, the plurality of bases (82) being gradually erected with a stabilizing frame (9) from bottom to top, at least one layer of a transverse support (91) in the stabilizing frame (9) being internally provided with a first drainage pipe (95) connected to the drainage path; The stabilizing frame (9) further comprises a flow guide (94) arranged on a transverse support (91) having a first drainage pipe (95) built therein, a vertical support rod (92) and an oblique support rod (93) supporting and connecting the transverse support (91); a water inlet connected to the first drainage pipe (95) is arranged on the periphery of the transverse support (91); a flow guide plate (941) is arranged adjacent to the water inlet; the flow guide plate (941) is arc-shaped; and a filter portion (942) is arranged between the flow guide plate (941) and the water inlet.

2. The new and old road widening structure according to claim 1 is characterized in that: The upper end of the base (82) is rectangular and the lower end is an inverted right triangle. The end surface of the base (82) facing the original roadbed (2) is provided with an inclined panel, and a plurality of first inclined seepage holes are provided on the inclined panel. The first inclined seepage holes are provided with multiple layers of filtration. The end surface of the base (82) facing the new roadbed (6) is provided with a vertical drainage board, and the bottom of the vertical drainage board is connected to the bottom of the inclined panel. The end surface of the vertical drainage board facing the new roadbed (6) is provided with second inclined seepage holes, and the second inclined seepage holes are provided with multiple layers of filtration.

3. The new and old road widening structure according to claim 2 is characterized in that: The new pavement (7) comprises a prefabricated base layer, a surface layer (12) arranged on the prefabricated base layer, and a cushion layer (11) arranged on the lower end surface of the prefabricated base layer. A reinforced connection portion (13) is provided between the joint of the prefabricated base layer and the cushion layer (11). A drainage groove (104) is arranged in the prefabricated base layer. The drainage groove (104) is connected to the longitudinal drainage pipe (41) of the original drainage system (4). A connecting piece (14) is provided between the prefabricated base layer and the base layer of the original pavement (3). The connecting piece (14) is used to connect the prefabricated base layer with the base layer of the original pavement (3).

4. The new and old road widening structure according to claim 3 is characterized in that: The prefabricated base layer comprises a plurality of main base blocks (101), adjacent main base blocks (101) are spliced ​​and connected via a reinforced connection portion (13), each main base block (101) comprises a stable waterproof substrate (102), a pointed cone protrusion (103) is provided at the center of the stable waterproof substrate (102), and the pointed cone protrusion (103) is inclined toward a drainage groove (104), the drainage groove (104) is arranged on the stable waterproof substrate (102), the drainage direction of the drainage groove (104) is unidirectional drainage, the stable waterproof substrate (102) is provided with a water inlet pipe (106) and a drainage pipe (107) corresponding to the drainage groove (104), a permeable substrate (105) is laid on the top of the stable waterproof substrate (102), and the bottom of the permeable substrate (105) is in contact with the pointed cone protrusion (103).

5. The new and old road widening structure according to claim 4 is characterized in that: The stable waterproof substrate (102) comprises a peripheral frame (15), the front end of the peripheral frame (15) is provided with a first C-shaped groove (151) and the upper part of the front end is provided with a triangular block (152), the bottom of the triangular block (152) is provided with a guide convex strip, the rear end of the peripheral frame (15) is provided with a second C-shaped groove (153) corresponding to the first C-shaped groove (151), and the upper end of the second C-shaped groove (153) is provided with a guide groove corresponding to the guide convex strip, and the first C-shaped groove (151) and the second C-shaped groove (153) are combined to form a transverse reinforcement channel (154); The outer frame (15) has a concave end (157) at the left end and a convex end (156) at the right end, and the convex end (156) and the concave end (157) are combined to form a vertical reinforcement channel (155), and the cushion layer (11) is vertically penetrated with reinforcement ribs corresponding to the vertical reinforcement channel (155); The reinforced connection portion (13) is a transverse reinforcement channel (154) and a vertical reinforcement channel (155) in which waterproof mortar is poured.

6. The new and old road widening structure according to claim 5 is characterized in that: The connecting piece (14) comprises a triangular groove (16) formed by cutting the base layer of the original road surface (3), a waterproof geotextile is laid in the triangular groove (16), an adjacent base block (17) is spliced ​​at the triangular groove (16), a triangular end (18) is provided on the end surface of the adjacent base block (17) facing the triangular groove (16), and the triangular end (18) is provided with an oblique grouting hole, a hollow connecting rod (19) is obliquely inserted into the base layer of the original road surface (3) corresponding to the oblique grouting hole, concrete is poured in the hollow connecting rod (19) and the oblique grouting hole, and a guide plate (941) is welded on the upper end of the hollow connecting rod (19), and a vertical drainage is provided in the adjacent base block (17) corresponding to the longitudinal pipeline.

7. A construction method for the new and old road widening structure according to claim 6, characterized in that: The following steps are involved: S1: Determine whether the original road surface (3), the original roadbed (2) and the original drainage system (4) of the original road (1) have any damage or disease problems, and determine whether they meet the standards for road widening after renovation based on the severity of the problems. If they meet the standards, proceed to the road widening construction; S2: After dismantling the auxiliary facilities on the side of the original roadbed (2) that needs to be widened, the slope is repaired, and an extended drainage pipe is installed on the longitudinal drainage pipe (41) on the side that needs to be widened, and a connection port connected to the new drainage system is reserved on the extended drainage pipe; S3: reinforcing anchor rods (81) are driven into the repaired slope from bottom to top step by step and the bases (82) are installed. The drainage paths between adjacent bases (82) are connected to each other, and the drainage port of the base (82) at the bottom is connected to the reserved connection port. The two drainage paths of the base (82) are checked to see if the drainage is smooth and there is no leakage. If there is any problem, the next stage of construction is started after the problem is repaired. S4: after determining that the drainage roadbed of the base (82) has been laid up to standard, stabilizing frames (9) are erected layer by layer from bottom to top and filled step by step simultaneously, wherein the transverse supports (91) in at least two layers of the stabilizing frames (9) are replaced with transverse supports (91) having a first drainage pipe (95), and flow guides (94) are installed between the transverse supports (91); S5: After the construction of the new roadbed (6) is completed, a cushion layer (11) is laid on the new roadbed (6), a prefabricated base layer is installed on the cushion layer (11), the prefabricated base layer is spliced ​​to form a one-way drainage or a two-way drainage, and the cushion layer (11) and the prefabricated base layer (10) are reinforced by strengthening the connection, and then the prefabricated base layer is connected to the base layer of the original road (1) by a connecting piece (14), and then a surface layer (12) is laid on the prefabricated base layer; S6: After the surface layer (12) is laid, a drainage channel is built on the slope of the new roadbed (6) between the drainage pipe (107) in the prefabricated base layer and the transverse support (91) of the extended slope, and greening is planted on the roadbed slope.

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