A riverside roadbed structure in deep soft soil area and its construction method

Abstract

The present invention provides a riverside roadbed structure in a deep soft soil area and a construction method thereof, applies foam lightweight soil to the soft soil roadbed structure, and utilizes the advantages of lightweight, high strength, solidification and uprightness, high fluidity and self-compacting of foam lightweight soil materials to effectively solve the problems of stability, durability, settlement and cracking of riverside soft soil roadbed. By replacing ordinary soil with lightweight materials for roadbed filling, the self-weight of the roadbed is greatly reduced, and the additional stress of the foundation is reduced, thereby achieving the purpose of controlling the settlement of the roadbed after construction, avoiding the large-scale use of composite foundations, effectively saving project investment and shortening the construction period. At the same time, scientific management of groundwater and surface water through relevant structures can not only strengthen the hydraulic connection between the river water flow and the groundwater in the outer area to form dynamic replenishment; it can also make the rainwater on the road surface flow into the river after preliminary sedimentation and filtration, so as to avoid the river water body from being polluted by road surface sources.

Description

Technical Field

[0001] The invention belongs to the technical field of roadbed structure construction, and in particular relates to a riverside roadbed structure in a deep soft soil area and a construction method thereof. Background Art

[0002] Deep soft soil layers are widely distributed in the Yangtze River Delta and Pearl River Delta regions of my country. The mechanical properties of soft soil are poor, which brings great challenges to engineering construction in related areas. According to the engineering practice experience in deep soft soil areas, uneven settlement often occurs when building road projects in the above-mentioned areas with poor geological distribution, and even serious cracking and damage of roads occurs, which seriously affects the safety and comfort of road driving. In order to avoid or reduce the settlement of roads after construction, the soft soil foundation needs to be treated first when building road projects in soft soil areas. At present, the commonly used treatment methods include preloading method, drainage consolidation method and composite foundation. After the treatment is completed, the construction is carried out according to the road structure in general areas, but it often faces problems such as long soft foundation treatment time and unsatisfactory treatment effect. Especially in riverside roads, the soft foundation treatment effects of preloading method and drainage consolidation method are more uneven, which often leads to serious uneven settlement after road construction and a high repair rate. With the composite foundation, the settlement control of the roadbed after construction is relatively good, but the project investment is high and the construction period is long. Summary of the invention

[0003] The embodiment of the present invention provides a riverside roadbed structure in a deep soft soil area and a construction method thereof, which can control the post-construction settlement of the roadbed, reduce the project cost, and improve the construction efficiency without performing transitional soft foundation treatment.

[0004] In a first aspect, an embodiment of the present invention provides a riverside roadbed structure in a deep soft soil area, comprising:

[0005] The lower structure includes a plain concrete foundation, a reinforced concrete support beam and a stone retaining wall, wherein the plain concrete foundation is arranged at the bottom edge of the river channel, one side of the reinforced concrete support beam is supported on the plain concrete foundation, and the other side is supported on the river channel structure on the opposite bank, the stone retaining wall is arranged on the upper side of the plain concrete foundation, the top width of the stone retaining wall is greater than or equal to 1 meter, and the top elevation of the stone retaining wall is 20 to 30 centimeters lower than the normal water level of the river channel;

[0006] The upper structure includes gabion gabions, reinforced concrete panel walls, ecological flower beds, stone cushions, foam lightweight soil fill 250, plain soil fill, railings and pavement structures, wherein the gabion gabions are arranged on the top of the stone retaining wall, the thickness of the gabion gabions is 50 cm, the width of the gabion gabions is the same as the top width of the stone retaining wall, the inner and outer sides of the gabion gabions are respectively aligned with the inner and outer edges of the top of the stone retaining wall, the gabion gabions are provided with a stone cushion of the same thickness on one side of the river bank, the reinforced concrete panel wall is placed above the gabion gabions and the stone cushion, the toe of the reinforced concrete panel wall is greater than or equal to 50 cm from the outer edge of the gabion gabions, and the top elevation of the reinforced concrete panel wall is 1.5 m. The foam lightweight soil fill body 250 is arranged behind the reinforced concrete panel wall and above the stone cushion layer. The top of the foam lightweight soil fill body 250 is flush with the top of the reinforced concrete panel wall. The ecological flower bed is arranged at the reinforced concrete panel wall and the top of the foam lightweight soil fill body 250. The outer side of the ecological flower bed is aligned with the outer side of the top of the reinforced concrete panel wall. The top surface elevation of the ecological flower bed is the design elevation of the riverside road. The plain soil fill body is arranged at the rear side of the ecological flower bed. The top surface elevation of the plain soil fill body is the design elevation of the roadbed top. The pavement structure is placed on the top of the plain soil fill body. The railing is placed on the wall of the ecological flower bed at the outermost side of the road.

[0007] According to some embodiments of the present invention, the plain concrete foundation is provided with a tenon.

[0008] According to some embodiments of the present invention, the reinforced concrete support beam is a tic-tac-toe structure composed of a plurality of longitudinal and transverse beams, and blocks of stone are used to fill the space between the longitudinal and transverse beams.

[0009] According to some embodiments of the present invention, the block stone cushion layer is composed of a layer of anti-filtration geotextile, a 30 cm thick block stone layer, a 20 cm thick geocell gravel cushion layer and another layer of anti-filtration geotextile from bottom to top.

[0010] According to some embodiments of the present invention, the vertical plate of the reinforced concrete panel wall is pre-embedded with a number of short steel bars, the heel plate is pre-embedded with angle steel columns at a certain interval, the bottom of the angle steel column is embedded in the heel plate of the panel wall, and the top is flush with the top surface of the panel wall, and the short steel bars are connected to the angle steel column by tie steel bars.

[0011] According to some embodiments of the present invention, the foam lightweight soil filling body 250 is formed by pouring and solidifying the foam lightweight soil in situ, and two layers of galvanized wire mesh are provided within a thickness of 30 cm at the bottom and top respectively.

[0012] According to some embodiments of the present invention, the ecological flower bed is concave and is made of cast-in-place reinforced concrete. A layer of anti-filtration geotextile is fully covered along the inner wall and the bottom surface of the ecological flower bed, and the interior is filled with biological retention soil. A plurality of drainage holes are arranged along the longitudinal direction of the road on the side wall plate facing the river, and the ecological flower bed is also provided with a railing installation connector.

[0013] According to some embodiments of the present invention, the plain soil filling body is obtained by compacting ordinary roadbed soil in layers, and the plain soil filling body and the pavement structure together serve as the ballast weight of the foam lightweight soil filling body 250 .

[0014] According to some embodiments of the present invention, the top surface of the pavement structure is provided with a transverse slope having a gradient greater than or equal to 1.5%.

[0015] In a second aspect, an embodiment of the present invention further provides a method for constructing a riverside roadbed in a deep soft soil area, comprising the following steps:

[0016] Construction of water interception cofferdam to drain the river water within the cofferdam;

[0017] Excavation and support of foundation pit, construction of plain concrete foundation and reinforced concrete support beams, filling the space between reinforced concrete support beams with blocks of stone, and setting expansion joints every 10 to 15 meters for the plain concrete foundation;

[0018] After the strength of the plain concrete foundation reaches 80% of the design strength, a masonry retaining wall is built on the plain concrete foundation, another set of deformation joints is set at the position corresponding to the deformation joints of the plain concrete foundation, the top elevation of the wall is 20 to 30 cm lower than the design normal water level, and drainage holes are pre-buried;

[0019] After the strength of the stone retaining wall reaches 80% of the design strength, backfill the wall, remove the foundation pit support structure, level the site behind the wall, compact and fully spread a layer of anti-filter geotextile, and keep the elevation of the leveled and compacted site consistent with the top elevation of the stone retaining wall;

[0020] A gabion gabion is implemented on the top of the stone retaining wall. The thickness of the gabion gabion is 50 cm, and the width is consistent with the top width of the stone retaining wall. A 30 cm thick stone cushion is first set behind the gabion gabion and compacted. Then, a 20 cm thick geocell is fully paved within the roadbed range, and after filling with graded crushed stone for compaction, a layer of anti-filter geotextile is fully paved on the top of the gabion gabion and the graded crushed stone cushion;

[0021] dismantling or retaining the construction water-cutting cofferdam, wherein when dismantling the construction water-cutting cofferdam, the water level of the river channel is not higher than the normal water level;

[0022] In the construction of reinforced concrete panel wall, short steel bars are embedded in the panel wall slabs and angle steel columns are embedded in the heel slabs before concrete pouring;

[0023] Pour the foamed lightweight soil in layers, with a one-time pouring thickness of no more than 1.0 meter. The upper layer can be poured only after the lower layer of lightweight soil has initially solidified. Two layers of galvanized wire mesh should be laid at the bottom and 30 cm of the top of the pouring respectively.

[0024] After the foam lightweight soil solidifies and reaches the designed strength, a layer of waterproof geotextile is spread on it, and then an ecological flower bed is implemented, and railing installation connectors are reserved;

[0025] After the strength of the ecological flower bed reaches 80% of the design strength, a plain soil filling body is constructed and compacted according to a preset roadbed compaction degree, and then a pavement structure layer is constructed on the plain soil filling body;

[0026] Install riverside railings and plant ecological flower beds.

[0027] The riverside roadbed structure in deep soft soil areas provided by the embodiment of the present invention includes: applying foam lightweight soil to the soft soil roadbed structure, and utilizing the advantages of lightweight, high strength, solidification and uprightness, high fluidity and self-compacting of foam lightweight soil materials to effectively solve the problems of stability, durability and settlement cracking of riverside soft soil roadbed. By replacing ordinary soil with lightweight materials for roadbed filling, the self-weight of the roadbed is greatly reduced, and the additional stress of the foundation is reduced, thereby achieving the purpose of controlling the settlement of the roadbed after construction, avoiding the large-scale use of composite foundations, effectively saving project investment and shortening the construction period. At the same time, scientific management of groundwater and surface water through relevant structures can not only strengthen the hydraulic connection between the river water flow and the groundwater in the outer area to form dynamic replenishment; it can also allow rainwater on the road surface to flow into the river after preliminary sedimentation and filtration, so as to avoid the river water body from being polluted by road surface sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of a riverside roadbed structure provided by an embodiment of the present invention;

[0029] Figure 2 It is a plan view of the connection structure between the panel wall and the lightweight earth filling body provided by an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the connection between the pre-buried short steel bars and the connecting steel bars provided in an embodiment of the present invention;

[0031] Figure 4 The present invention Figure 2 A magnified view of part A;

[0032] Figure 5 It is a cross-sectional schematic diagram of an ecological flower bed provided in an embodiment of the present invention.

[0033] Figure 6 It is a flow chart of a method for constructing a riverside roadbed in a deep soft soil area provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "first", etc. in the specification, claims or the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0036] The present invention provides a riverside roadbed structure in a deep soft soil area and a construction method thereof, comprising: applying foam lightweight soil to the soft soil roadbed structure, utilizing the advantages of lightweight, high strength, solidification and uprightness, high fluidity and self-compacting of foam lightweight soil materials, and effectively solving the problems of stability, durability, settlement and cracking of the riverside roadbed. By replacing ordinary soil with lightweight materials for roadbed filling, the self-weight of the roadbed is greatly reduced, and the additional stress of the foundation is reduced, thereby achieving the purpose of controlling the settlement of the roadbed after construction, avoiding the large-scale use of composite foundations, effectively saving project investment and shortening the construction period. At the same time, scientific management of groundwater and surface water through relevant structures can not only strengthen the hydraulic connection between the river water flow and the groundwater in the outer area to form dynamic replenishment; it can also allow rainwater on the road surface to flow into the river after preliminary sedimentation and filtration, so as to avoid the river water body from being polluted by road surface sources.

[0037] Reference Figure 1 The present application embodiment provides a riverside roadbed structure in a deep soft soil area, comprising:

[0038] The lower structure includes a plain concrete foundation 110, a reinforced concrete support beam 120 and a stone retaining wall 130, wherein the plain concrete foundation 110 is arranged at the bottom edge of the river channel, one side of the reinforced concrete support beam is supported on the plain concrete foundation 110, and the other side is supported on the river channel structure on the opposite bank, and the stone retaining wall 130 is arranged on the upper side of the plain concrete foundation 110, the top width of the stone retaining wall 130 is greater than or equal to 1 meter, and the top elevation of the stone retaining wall 130 is 20 to 30 centimeters lower than the normal water level of the river channel;

[0039] The upper structure includes gabion gabion cages 210, reinforced concrete panel walls 220, ecological flower beds 230, stone cushion layers 240, foam lightweight soil fill 250, plain soil fill 260, railings 270 and pavement structure 280, wherein the gabion gabion cages 210 are arranged on the top of the stone retaining wall 130, the thickness of the gabion gabion cages 210 is 50 cm, the width of the gabion gabion cages 210 is the same as the top width of the stone retaining wall 130, the inner and outer sides of the gabion gabion cages 210 are respectively aligned with the inner and outer edges of the top of the stone retaining wall 130, the gabion gabion cages 210 are provided with stone cushion layers 240 of the same thickness on one side of the river bank, the reinforced concrete panel walls 220 are placed above the gabion gabion cages 210 and the stone cushion layers 240, the toe of the reinforced concrete panel walls 220 is greater than or equal to 50 cm from the outer edge of the gabion gabion cages 210, and the reinforced concrete panel walls 220 are placed above the gabion gabion cages 210 and the stone cushion layers 240. The top elevation of the concrete panel wall 220 is higher than the design flood level of the river channel. The foam lightweight soil fill body 250 is arranged behind the reinforced concrete panel wall 220 and above the block stone cushion layer 240. The top of the foam lightweight soil fill body 250 is flush with the top of the reinforced concrete panel wall 220. The ecological flower bed 230 is arranged on the top of the reinforced concrete panel wall 220 and the foam lightweight soil fill body 250. The outer side of the ecological flower bed 230 is aligned with the outer side of the top of the reinforced concrete panel wall 220. The top surface elevation of the ecological flower bed 230 is the design elevation of the riverside road. The plain soil fill body 260 is arranged on the rear side of the ecological flower bed 230. The top surface elevation of the plain soil fill body 260 is the design elevation of the roadbed top. The pavement structure 280 is placed on the top of the plain soil fill body 260. The railing 270 is placed on the pool wall of the outermost ecological flower bed 230 on the road.

[0040] It should be noted that, refer to Figure 1 In this embodiment, the river normal water level elevation is H1, the flood level design elevation is H2, the road design elevation is H3, the panel wall top elevation is H4, the pavement structure 280 layer thickness is h, the riverside road subgrade width is B, the foam lightweight soil wet weight is γ1, the soil weight is γ2, and the pavement structure 280 layer average weight is γ3. The wall top width is not less than 1.0 meters, and the wall top elevation is (H1-0.3). The reinforced concrete panel wall 220 is placed above the gabion stone cage 210 and the cushion layer, and the wall toe is 1.0 meters away from the gabion stone cage 210. The outer edge is not less than 50 cm, the wall top elevation is not lower than H2, foam lightweight soil is used to fill the back of the wall and the cushion layer, the top elevation of the lightweight soil fill is H2, the ecological flower bed 230 is set on the top of the panel wall and the foam lightweight soil fill 250, the outer side is aligned with the outer side of the top of the panel wall, and the top surface elevation is H3, followed by a plain soil fill 260, the top surface elevation of the plain soil fill 260 is H3-h, the pavement structure 280 is placed on the top of the plain soil fill 260, and the railing 270 is placed on the wall of the outermost ecological flower bed 230 on the road.

[0041] It is worth noting that, through the structure of this embodiment, foam lightweight soil is reasonably applied to the soft soil roadbed structure, giving full play to the characteristics of foam lightweight soil materials such as light weight, high strength, solidification and uprightness, high fluidity and self-compacting, and systematically considering the waterproofing, drainage, stability, durability and deformation and cracking of riverside roadbed, and innovating the traditional roadbed structure. By replacing ordinary soil with lightweight materials for roadbed filling, the self-weight of the roadbed is greatly reduced, and the additional stress of the foundation is reduced, so as to achieve the purpose of controlling the settlement of the roadbed after construction, avoid the large-scale use of composite foundations, and further save engineering investment and shorten the construction period. At the same time, the riverside roadbed structure manages the surface water and groundwater within the scope of the project construction through a series of structural measures. On the one hand, it can ensure that the river water flow and the groundwater in the outer area are in good hydraulic connection, forming a dynamic replenishment, reflecting the ecological nature of river construction; on the other hand, the rainwater on the road surface can be discharged into the river after preliminary sedimentation and filtration, so as to avoid the river water from being polluted by the surface source of the road surface.

[0042] In addition, in one embodiment, referring to Figure 1 The plain concrete foundation 110 is provided with a tenon 111 .

[0043] It should be noted that adding the tenon 111 to the plain concrete foundation 110 can enhance the connection stability between the plain concrete foundation 110 and the stone retaining wall 130 .

[0044] In addition, in one embodiment, referring to Figure 1 The reinforced concrete support beam 120 is a tic-tac-toe structure composed of a plurality of longitudinal and transverse beams, and blocks of stone are used to fill the space between the longitudinal and transverse beams.

[0045] It should be noted that the reinforced concrete support beam 120 is a tic-tac-toe structure composed of multiple longitudinal and transverse beams, which can enhance the stability of the reinforced concrete support beam 120. By filling it with stone blocks, it can provide support when the longitudinal and transverse beams are subjected to force, thereby increasing the pressure they can withstand.

[0046] In addition, in one embodiment, referring to Figure 1 The block stone cushion layer 240 is composed of a layer of anti-filtration geotextile, a 30 cm thick block stone layer, a 20 cm thick geocell gravel cushion layer 241 and another layer of anti-filtration geotextile from bottom to top.

[0047] It should be noted that the structure of this embodiment can ensure that the river water has a good hydraulic connection with the groundwater in the outer area. When the river water level rises, it can replenish the surrounding groundwater, and when the water level drops, the groundwater inside the roadbed can be quickly discharged.

[0048] It should be noted that, by adopting the structure of this embodiment, the geocell gravel cushion layer 241 can also increase the overall stiffness of the cushion layer, improve the ability of the foundation to adapt to uneven settlement, and avoid cracking and damage of the foam lightweight soil filling body 250 due to uneven settlement of the foundation.

[0049] In addition, in one embodiment, referring to Figures 2 to 4 The vertical plate 224 of the reinforced concrete panel wall 220 is pre-embedded with a number of short steel bars 223, and the heel plate is pre-embedded with angle steel columns 221 at a certain interval. The bottom of the angle steel column 221 is embedded in the heel plate of the panel wall, and the top is flush with the top surface of the panel wall. The short steel bars 223 are connected to the angle steel column 221 through the tie steel bars 222.

[0050] It should be noted that, through the structure of this embodiment, the interior of the reinforced concrete panel can be connected through the pre-buried angle steel columns 221, short steel bars 223 and tie bars 222 to enhance the connection stability between the panel wall and the foam lightweight soil fill body 250.

[0051] In addition, in one embodiment, referring to Figure 1 The foam lightweight soil filling body 250 is formed by pouring and solidifying the foam lightweight soil, and two layers of galvanized wire mesh 251 are respectively arranged within a thickness of 30 cm at the bottom and the top.

[0052] It should be noted that the galvanized wire mesh 251 can enhance the crack resistance of the foam lightweight soil and avoid deformation that may cause cracking of the foam lightweight soil filling body 250. In addition, a layer of waterproof geotextile is fully spread on the top surface of the filling body to prevent ground water from directly infiltrating into the lightweight soil filling body.

[0053] In addition, in one embodiment, referring to Figure 1 and Figure 5 The ecological flower bed 230 is concave and is made of cast-in-place reinforced concrete. A layer of anti-filter geotextile is fully paved along the inner wall and the bottom surface of the ecological flower bed 230, and the interior is filled with bioretention soil 231. A plurality of drainage holes are arranged along the longitudinal direction of the road on the side wall plate facing the river. The ecological flower bed 230 is also provided with a railing 270 for installing connectors.

[0054] It should be noted that the ecological flower bed 230 is provided with a plurality of drainage holes 232 and is paved with an anti-filtration geotextile 233 and filled with bioretention soil 231 to ensure that the water discharged from the ecological flower bed 230 to the river channel undergoes preliminary sedimentation and filtration, thereby preventing the river water from being polluted.

[0055] In addition, in one embodiment, referring to Figure 1 The plain soil filling body 260 is obtained by compacting ordinary roadbed soil in layers, and the plain soil filling body 260 and the pavement structure 280 together serve as the weight of the foam lightweight soil filling body 250 .

[0056] It should be noted that the plain soil filling body 260 and the pavement structure 280 together serve as the weight of the foamed lightweight soil filling body 250, which can prevent the foamed lightweight soil filling body 250 from floating and becoming unstable at high water levels. The minimum thickness should ensure that the foamed lightweight soil filling body 250 can meet the requirements of anti-floating stability at the design flood level, that is, it should satisfy the following formula:

[0057] Among them, γ w is the gravity of water, g is the acceleration of gravity, k is the anti-buoyancy safety factor, and the remaining parameters can refer to the definitions of the above embodiment.

[0058] In addition, in one embodiment, referring to Figure 1 The top surface of the pavement structure 280 is provided with a transverse slope having a gradient greater than or equal to 1.5%.

[0059] It should be noted that if Figure 1 As shown, the road surface structure 280 is provided with a slope, which can ensure that rainwater on the road surface can smoothly enter the ecological flower bed 230 and then flow into the river after being filtered.

[0060] In addition, refer to Figure 6 The embodiment of the present invention also provides a method for constructing a riverside roadbed in a deep soft soil area, including but not limited to the following steps:

[0061] Step S1, constructing a water interception cofferdam to drain the river water in the cofferdam;

[0062] Step S2, excavation and support of foundation pit, construction of plain concrete foundation and reinforced concrete support beams, filling of the space between reinforced concrete support beams with blocks of stone, and setting of deformation joints every 10 to 15 meters in the plain concrete foundation;

[0063] Step S3, after the strength of the plain concrete foundation reaches 80% of the design strength, a masonry retaining wall is built on the plain concrete foundation, another set of deformation joints are set at positions corresponding to the deformation joints of the plain concrete foundation, the elevation of the top of the wall is 20 to 30 cm lower than the design normal water level, and drainage holes are pre-buried;

[0064] Step S4, after the strength of the stone retaining wall reaches 80% of the design strength, backfill the wall, remove the foundation pit support structure, level the site behind the wall, compact and fully spread a layer of anti-filter geotextile, and keep the elevation of the leveled and compacted site consistent with the elevation of the top of the stone retaining wall;

[0065] Step S5, implement gabion gabion on the top of the stone retaining wall, the thickness of the gabion gabion is 50 cm, and the width is consistent with the top width of the stone retaining wall, first set a 30 cm thick block stone cushion layer behind the gabion gabion and compact it, then fully pave 20 cm thick geocell within the roadbed range, fill with graded gravel for compaction, and then fully pave a layer of anti-filter geotextile on the top of the gabion gabion and the graded gravel cushion;

[0066] Step S6, dismantling or retaining the construction water cut-off cofferdam, wherein when dismantling the construction water cut-off cofferdam, the river water level is not higher than the normal water level;

[0067] Step S7, reinforced concrete panel wall construction, before concrete pouring, short steel bars are embedded in the panel wall vertical plate, and angle steel columns are embedded in the heel plate;

[0068] Step S8, pouring foam lightweight soil in layers, with a one-time pouring thickness of no more than 1.0 meter. The upper layer can be poured only after the lower layer of lightweight soil has initially solidified. Two layers of galvanized wire mesh should be laid at 30 cm at the bottom and top of the pouring respectively;

[0069] Step S9, after the foam lightweight soil solidifies and reaches the designed strength, a layer of waterproof geotextile is fully spread on it, and then an ecological flower bed is implemented, and railing installation connectors are reserved;

[0070] Step S10, after the strength of the ecological flower bed reaches 80% of the design strength, a plain soil filling body is constructed and compacted according to a preset roadbed compaction degree, and then a pavement structure layer is constructed on the plain soil filling body;

[0071] Step S11, installing riverside railings and planting ecological flower beds.

[0072] It should be noted that the riverside roadbed structure in the deep soft soil area obtained by the above construction method can apply foam lightweight soil to the soft soil roadbed structure, and take advantage of the lightweight, high strength, solidified upright, high fluidity and self-compacting advantages of foam lightweight soil materials to effectively solve the problems of stability, durability and settlement cracking of riverside soft soil roadbed. By replacing ordinary soil with lightweight materials for roadbed filling, the self-weight of the roadbed is greatly reduced, and the additional stress of the foundation is reduced, so as to achieve the purpose of controlling the settlement of the roadbed after construction, avoid the large-scale use of composite foundations, effectively save project investment and shorten the construction period. At the same time, scientific management of groundwater and surface water through relevant structures can not only strengthen the hydraulic connection between river water flow and groundwater in the outer area to form dynamic recharge; it can also allow rainwater on the road surface to flow into the river after preliminary sedimentation and filtration, so as to avoid river water from non-point source pollution from the road surface.

[0073] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0074] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0075] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A construction method for a riverside roadbed structure in a deep soft soil area, characterized in that: The riverside roadbed structure in the deep soft soil area includes a lower structure, which includes a plain concrete foundation, a reinforced concrete support beam and a stone retaining wall, wherein the plain concrete foundation is arranged at the bottom edge of the river channel, one side of the reinforced concrete support beam is supported on the plain concrete foundation, and the other side is supported on the river channel structure on the opposite bank, the stone retaining wall is arranged on the upper side of the plain concrete foundation, the top width of the stone retaining wall is greater than or equal to 1 meter, and the top elevation of the stone retaining wall is 20 to 30 centimeters lower than the normal water level of the river channel; The riverside roadbed structure in deep soft soil area also includes an upper structure, which includes gabion gabions, reinforced concrete panel walls, ecological flower beds, stone cushion layers, foam lightweight soil fill 250, plain soil fill, railings and pavement structure, wherein the gabion gabions are arranged on the top of the stone retaining wall, the thickness of the gabion gabions is 50 cm, the width of the gabion gabions is the same as the top width of the stone retaining wall, the inner and outer sides of the gabion gabions are respectively aligned with the inner and outer edges of the top of the stone retaining wall, the gabion gabions are provided with a stone cushion layer of the same thickness on one side of the river bank, the reinforced concrete panel wall is placed above the gabion gabions and the stone cushion layer, the toe of the reinforced concrete panel wall is greater than or equal to 50 cm from the outer edge of the gabion gabions, and the reinforced concrete The top elevation of the panel wall is higher than the pre-designed flood level. The foam lightweight soil filling body 250 is arranged behind the reinforced concrete panel wall and above the block stone cushion layer. The top of the foam lightweight soil filling body 250 is flush with the top of the reinforced concrete panel wall. The ecological flower bed is arranged on the reinforced concrete panel wall and the top of the foam lightweight soil filling body 250. The outer side of the ecological flower bed is aligned with the outer side of the top of the reinforced concrete panel wall. The top surface elevation of the ecological flower bed is the design elevation of the riverside road. The plain soil filling body is arranged at the rear side of the ecological flower bed. The top surface elevation of the plain soil filling body is the design elevation of the roadbed top. The pavement structure is placed on the top of the plain soil filling body. The railing is placed on the pool wall of the ecological flower bed at the outermost side of the road. The reinforced concrete support beam is a tic-tac-toe structure composed of multiple longitudinal and transverse beams, and the longitudinal and transverse beams are filled with blocks of stone; the block stone cushion layer is composed of a layer of anti-filter geotextile, a 30 cm thick block stone layer, a 20 cm thick geocell crushed stone cushion layer and another layer of anti-filter geotextile from bottom to top; the panel wall upright plate of the reinforced concrete panel wall is pre-embedded with a number of short steel bars, and the heel plate is pre-embedded with angle steel columns at a certain interval. The bottom of the angle steel column is embedded in the heel plate of the panel wall, and the top is flush with the top surface of the panel wall. The short steel bars and the angle steel columns are connected by steel bars. The foam lightweight soil filling body 250 is formed by pouring and condensing foam lightweight soil, and two layers of galvanized wire mesh are respectively arranged within a thickness of 30 cm at the bottom and top; the ecological flower bed is concave, and the ecological flower bed is made of cast-in-place reinforced concrete. The ecological flower bed is fully paved with a layer of anti-filter geotextile along the inner wall and bottom surface, and the interior is filled with bioretention soil, and a plurality of drainage holes are arranged along the longitudinal direction of the road on the side wall plate facing the river, and the ecological flower bed is also provided with a railing installation connector; the top surface of the pavement structure is provided with a transverse slope with a slope greater than or equal to 1.5%; The construction method of the riverside roadbed structure in deep soft soil area comprises the following steps: Construction of water interception cofferdam to drain the river water within the cofferdam; Excavation and support of foundation pit, construction of plain concrete foundation and reinforced concrete support beams, filling the space between reinforced concrete support beams with blocks of stone, and setting expansion joints every 10 to 15 meters for the plain concrete foundation; After the strength of the plain concrete foundation reaches 80% of the design strength, a masonry retaining wall is built on the plain concrete foundation, another set of deformation joints is set at the position corresponding to the deformation joints of the plain concrete foundation, the elevation of the wall top is 20 to 30 cm lower than the design normal water level, and drainage holes are pre-buried; After the strength of the stone retaining wall reaches 80% of the design strength, backfill the wall, remove the foundation pit support structure, level the site behind the wall, compact it and fully spread a layer of anti-filter geotextile, and keep the elevation of the leveled and compacted site consistent with the actual retaining wall top elevation; A gabion gabion is implemented on the top of the stone retaining wall. The thickness of the gabion gabion is 50 cm, and the width is consistent with the top width of the stone retaining wall. A 30 cm thick stone cushion is first set behind the gabion gabion and compacted. Then, a 20 cm thick geocell is fully paved within the roadbed range, and after filling with graded gravel and compacting, a layer of anti-filter geotextile is fully paved on the gabion gabion. dismantling or retaining the construction water-cutting cofferdam, wherein the water level of the river channel is not higher than the normal water level when the construction water-cutting cofferdam is dismantled; In the construction of reinforced concrete panel wall, short steel bars are embedded in the panel wall slabs and angle steel columns are embedded in the heel slabs before concrete pouring; Pour the foamed lightweight soil in layers, with a one-time pouring thickness of no more than 1.0 meter. The upper layer can be poured only after the lower layer of lightweight soil is initially prepared. Two layers of galvanized wire mesh should be laid at the bottom and top 30 cm respectively; After the foam lightweight soil solidifies and reaches the designed strength, a layer of waterproof geotextile is spread on it, and then an ecological flower bed is implemented, and railing installation connectors are reserved; After the strength of the ecological flower bed reaches 80% of the design strength, a plain soil filling body is constructed and compacted according to a preset roadbed compaction degree, and then a pavement structure layer is constructed on the plain soil filling body; Install riverside railings and plant ecological flower beds.

2. The construction method of the riverside roadbed structure in a deep soft soil area according to claim 1 is characterized in that: The plain concrete foundation is provided with tenons.

3. The construction method of the riverside roadbed structure in a deep soft soil area according to claim 1 is characterized in that: The plain soil filling body is obtained by compacting ordinary roadbed soil in layers, and the plain soil filling body and the pavement structure together serve as the ballast weight of the foamed lightweight soil filling body 250 .

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