CN114990955A - Municipal road structure in urban soft soil foundation zone and construction method thereof - Google Patents
Municipal road structure in urban soft soil foundation zone and construction method thereof Download PDFInfo
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The application discloses town road structure in city soft soil foundation area, including original state soil layer, soft soil layer, metalling, concrete layer and asphalt concrete layer, the original state soil layer is pegged graft and is had many spud piles, soft soil layer lays in original state soil layer's top, the spud pile bury underground in the soft soil layer, soft soil layer's top is provided with the waterproof layer, foam cement light soil layer has been laid at the top of waterproof layer, the metalling lays in the top on foam cement light soil layer, concrete layer lays in the top on metalling, asphalt concrete layer lays in concrete layer's top. The invention can reduce the local collapse phenomenon of the municipal road on the soft soil foundation. The invention also discloses a construction method of the municipal road in the urban soft soil foundation zone.
Description
Technical Field
The application relates to the field of municipal road construction, in particular to a municipal road structure in an urban soft soil foundation zone and a construction method thereof.
Background
The development of urbanization is not independent of the construction of municipal roads, the construction scene which is applied more in the construction of the municipal roads is a soft soil foundation, and the soft soil foundation is defined in a broad sense and mainly comprises soil layers such as loose soft soil with high content of fine particles such as clay and silt, organic soil with large pores, peat, loose sand and the like.
In different actual construction scenes, the soft soil foundation has different compositions, the compositions are complex, the compositions vary from place to place, the compositions vary from layer to layer, the unpredictability is large, in addition, the underground water level is high, the bearing capacity of the soft soil foundation is weak, and if the rigid concrete road is directly laid on the soft soil foundation, the soft soil foundation is settled to form a hollow area, so that the concrete road is partially collapsed.
Disclosure of Invention
In order to reduce the phenomenon of local collapse of the municipal road on the soft soil foundation, the application provides the municipal road structure in the urban soft soil foundation zone and the construction method thereof.
The application provides a town road structure in city soft soil foundation area and construction method thereof adopts the following technical scheme:
municipal road structure in city soft soil foundation area, including original state soil layer, soft soil layer, metalling, concrete layer and asphalt concrete layer, the grafting of original state soil layer has many spud piles, soft soil layer lays in original state soil layer's top, the spud pile bury underground in the soft soil layer, soft soil layer's top is provided with the waterproof layer, foam cement light soil layer has been laid at the top of waterproof layer, the metalling lays in the top on foam cement light soil layer, concrete layer lays in the top on metalling, asphalt concrete layer lays in concrete layer's top.
By adopting the technical scheme, a plurality of fixing piles are inserted into an original soil layer and the fixing piles are covered by a soft soil layer, so that a relatively flat ground is obtained, a solid supporting foundation is driven by the fixing piles to improve the supporting strength, and then a waterproof layer is laid in the soft soil layer, so that the phenomenon that the concrete layer is damaged by volume change generated by gasification or freezing of underground water is avoided, the cracking of the concrete layer is reduced, and the local collapse of the municipal road surface is reduced; then, a foam cement light soil layer laid on the waterproof layer plays a role in heat preservation, so that the load is reduced, the soil pressure is reduced, and the problem of engineering settlement caused by insufficient prepressing of a soft foundation road section is effectively solved; and then the laid concrete layer enables the municipal road surface to obtain a base layer with high compressive strength, and the local collapse phenomenon of the municipal road on the soft soil foundation is reduced.
Optionally, the fixing pile comprises a concrete pile, a steel bar cylinder and a pile cap, the concrete pile wraps the steel bar cylinder, the pile cap is arranged at the top of the concrete pile, a steel bar at one end of the steel bar cylinder is inserted into the pile cap, a steel bar at the other end of the steel bar cylinder is inserted into an original soil layer, and the pile cap jacks up the waterproof layer.
Through adopting above-mentioned technical scheme, a steel reinforcement section of thick bamboo provides the high skeleton of compressive strength for the concrete pile, high compressive strength's skeleton makes the concrete pile have stronger toughness, make the concrete pile be difficult for because of the too big phenomenon that ftractures or fracture takes place for the load, the pile cap at concrete pile top can effectively improve the area of contact of spud pile and top bed course simultaneously, thereby make the spud pile more balanced to the holding power of top bed course, thereby effectively avoid the town road on the soft soil foundation to appear the local phenomenon of collapsing, in addition, the pile cap makes the spud pile form the interlock with original state soil layer and soft soil layer, thereby make underground structure layer more stable, further effectively avoid the town road on the soft soil foundation to appear the local phenomenon of collapsing.
Optionally, the waterproof layer includes steel reinforcement cage and waterproof concrete, waterproof concrete parcel the steel reinforcement cage.
Through adopting above-mentioned technical scheme, the steel reinforcement cage provides the support chassis for pouring of waterproof concrete for the intensity of the waterproof layer that the solidification obtained is higher, is difficult for because of the too big fracture or fracture of load, imbeds in the waterproof concrete, effectively strengthens the support toughness of waterproof layer.
Optionally, the soft soil layer, the gravel layer, the concrete layer and the asphalt concrete layer are all arranged between the two cofferdams, one side of the cofferdam close to the concrete layer is in a step shape, the cross section of the cofferdam is in a ladder shape with the width narrowing from bottom to top, and the concrete layer and the cofferdam are mutually meshed.
Through adopting above-mentioned technical scheme, two trapezoidal form cofferdams package bed course structures of narrowing from bottom to top, in can effectively reducing groundwater infiltration bed course structure, effectively reduce the composition in the bed course structure and run off the phenomenon, and then effectively avoid the town road on the soft soil foundation to appear the phenomenon of local collapse, the structure of interlock layer upon layer is adopted with concrete layer to the cofferdam, can effectively strengthen the support intensity of town road, the cascaded side slope of cofferdam provides layer-by-layer bearing capacity for concrete layer, the cofferdam is to concrete layer's play pressure release effect, make concrete layer obtain sufficient holding power in the cofferdam on both sides.
Optionally, a plurality of anchor cables are obliquely arranged on the stepped surface of the cofferdam in a penetrating manner.
Through adopting above-mentioned technical scheme, many anchor cables that set up in the cofferdam increase the skid resistance of concrete layer between the cofferdam for the structural plane is in the state of compacting, effectively improves the wholeness of the echelonment side slope in cofferdam, effectively reduces the relative displacement of cofferdam and concrete layer, thereby further effectively avoids the town road on the soft soil foundation to appear the local phenomenon of collapsing.
Optionally, a drainage channel is formed in the top of the cofferdam.
Through adopting above-mentioned technical scheme, the drainage channel that cofferdam top began effectively discharges rainwater or surface gathered water town road, reduces in rainwater and the surface gathered water infiltration town road reason.
The construction method of the municipal road in the urban soft soil foundation zone comprises the following construction steps: s1, digging a foundation pit in the undisturbed soil layer, and pumping underground water in the foundation pit out; s2, digging soil in an undisturbed soil layer in the foundation pit to obtain a pile pit, and then arranging a fixed pile in the pile pit; s3, paving a soft soil layer on the undisturbed soil layer in the foundation pit, wherein the soft soil layer is buried in the fixing piles; s4, paving a waterproof layer on the soft soil layer, paving a foam cement light soil layer on the waterproof layer, and paving a gravel layer; and S5, pouring a concrete layer on the gravel layer, and finally paving an asphalt concrete layer on the concrete layer.
Optionally, the concrete steps of setting the fixed piles in the pile pits are as follows: inserting a mould cylinder in the pile pit, inserting a reinforcing steel bar cylinder in the mould cylinder, pouring cement into the mould cylinder to obtain a concrete pile, covering the top of the concrete pile with a mould cap, and pouring cement into the mould cap to obtain a pile cap, so that the arrangement of the fixed pile is realized.
Through adopting above-mentioned technical scheme, a mould section of thick bamboo and mould cap are pouring cement and provide limiting displacement for the spud pile structure that obtains after the solidification is more parallel and level, effectively improves its mechanics support nature.
Optionally, the specific step of arranging the waterproof layer in S4 is as follows: and placing the reinforcement cage on a soft soil layer, pouring waterproof cement paste into the foundation pit until the reinforcement cage is immersed by the waterproof cement paste, and finally curing to obtain a waterproof layer.
Optionally, cofferdams are arranged on two sides of the foundation pit dug in the step S1, a drainage channel is arranged at the top of each cofferdam, and then the mutually opposite surfaces of the two cofferdams are arranged to form a layer of ladder; before the concrete layer is poured in the S5 step-shaped face of the cofferdam is drilled in an inclined mode, then the anchor cable penetrates through the drilled hole, concrete is poured in the hole, and finally the concrete layer meshed with the cofferdam is poured on the gravel layer.
Through adopting above-mentioned technical scheme, many anchor cables that set up in the cofferdam increase the skid resistance of concrete layer between the cofferdam for the structural plane is in the state of compacting, effectively improves the wholeness of the echelonment side slope in cofferdam, effectively reduces the relative displacement of cofferdam and concrete layer, thereby further effectively avoids the town road on the soft soil foundation to appear the local phenomenon of collapsing.
In summary, the present application includes the following advantageous effects:
inserting a plurality of fixing piles in an original soil layer and covering the fixing piles with a soft soil layer so as to obtain a relatively flat ground, simultaneously driving a solid supporting foundation by the fixing piles to improve the supporting strength, then paving a waterproof layer in the soft soil layer, and effectively avoiding the infiltration of sewage and rainwater into the concrete layer, thereby avoiding the damage of the concrete layer caused by the volume change generated by the gasification or freezing of underground water, reducing the cracking of the concrete layer and further reducing the local collapse phenomenon of the municipal road surface; then, a foam cement light soil layer laid on the waterproof layer plays a role in heat preservation, so that the load is reduced, the soil pressure is reduced, and the problem of engineering settlement caused by insufficient prepressing of a soft foundation road section is effectively solved; and then the laid concrete layer enables the municipal road surface to obtain a base layer with high compressive strength, and the local collapse phenomenon of the municipal road on the soft soil foundation is reduced.
Drawings
Fig. 1 is a view showing a town road structure of an urban soft soil ground zone according to the invention of the present application.
Description of reference numerals:
1. an undisturbed soil layer; 2. a soft soil layer; 3. a crushed stone layer; 4. an asphalt concrete layer; 5. a waterproof layer; 51. a reinforcement cage; 52. waterproof concrete; 6. a foam cement light soil layer; 7. concrete piles; 71. a reinforcing steel bar cylinder; 72. pile caps; 8. cofferdam; 81. an anchor cable; 82. a drainage channel; 9. and a concrete layer.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses a municipal road structure of an urban soft soil foundation zone and a construction method thereof.
Firstly, digging a foundation pit in a construction ground by using an excavator, wherein the depth of the foundation pit is 10 meters, then pumping underground water in the foundation pit by using a water pump, standing for 2-3 days until no water seepage exists in the foundation pit, then the undisturbed soil layer 1 is leveled by a pavement flattening vehicle, so that the undisturbed soil layer 1 is compacted, a thick supporting layer is laid for laying other cushion layers subsequently, then build cofferdam 8 on the both sides of foundation ditch, drainage 82 is seted up at the top of cofferdam 8, drainage 82 that the top of cofferdam 8 begins effectively discharges rainwater or surface gathered water town road, reduce in rainwater and the surface gathered water infiltration town road reason, the cofferdam 8 shape of building is the ladder form that the width diminishes gradually from bottom to top, keep the interval between two cofferdams 8, the interval between two cofferdams 8 is 20 meters, the height of cofferdam 8 is 10 meters, the width at cofferdam 8 top is 2 meters, the width of cofferdam 8 bottom is 6 meters.
Digging a pile pit in an undisturbed soil layer 1 between two cofferdams 8, wherein the aperture of the pile pit is 1 meter, then pumping water in the pile pit away, cleaning crushed powder in the pile pit by air injection after air drying, then hoisting a mould cylinder by using a boom machine, positioning the mould cylinder by a constructor through manual assistance, placing the mould cylinder at an opening at the top of the pile pit, driving the mould cylinder into the pile pit by using a pile driver, hoisting a reinforcement cylinder 71 by using the boom machine, positioning the reinforcement cylinder 71 through manual assistance by the constructor, enabling the reinforcement cylinder 71 to be positioned right above the reinforcement cylinder 71, enabling the reinforcement cylinder 71 to be coaxial with the mould cylinder, gradually descending the reinforcement cylinder 71 until the reinforcement cylinder 71 is abutted against the undisturbed soil layer 1, compacting the reinforcement cylinder 71 by using a jack, enabling a reinforcement at the bottom of the reinforcement cylinder 71 to be inserted into the undisturbed soil layer 1, enabling the reinforcement at the bottom of the reinforcement cylinder 71 to be in a sharp taper shape, thereby increasing the pressure of the reinforcement at the bottom of the reinforcement cylinder 71 on the undisturbed soil layer 1, and easily fixing the reinforcement 51 in the undisturbed soil layer 1, the reinforcing bar at reinforcing bar section of thick bamboo 71 top exposes in the top of a mould section of thick bamboo, and a half of a mould section of thick bamboo is pegged graft in original state soil layer 1, and second half wears out original state soil layer 1, and then soft soil layer 2 is laid at the top of original state soil layer 1 again, highly being in time with keeping level in the top of a mould section of thick bamboo until soft soil layer 2, utilizes the road surface flatting car flattening soft soil layer 2.
The reinforcing bar at reinforcing bar section of thick bamboo 71 top is worn out the mould section of thick bamboo, and the manpower is buckled the reinforcing bar at reinforcing bar section of thick bamboo 71 top for reinforcing bar circumference expandes, then pours cement into the mould section of thick bamboo, forms concrete pile 7 behind the cement hydration solidification 7 d. And placing a mould cap in the soft soil layer 2, sleeving the mould cap and surrounding the steel bars at the top of the steel bar barrel 71, pouring cement into the mould cap, and curing to obtain a pile cap 72, wherein the depth of the concrete pile 7 embedded in the undisturbed soil layer 1 is 2 meters, and the depth of the concrete pile 7 embedded in the soft soil layer 2 is 2 meters.
A steel bar section of thick bamboo 71 provides the high skeleton of compressive strength for concrete pile 7, high compressive strength's skeleton makes concrete pile 7 have stronger toughness, make concrete pile 7 be difficult for taking place fracture or cracked phenomenon because of the load is too big, pile cap 72 at concrete pile 7 top can effectively improve the area of contact of spud pile and top bed course simultaneously, thereby make the spud pile more balanced to the holding power of top bed course, thereby effectively avoid the town road on the soft soil foundation to appear the local phenomenon of collapsing, in addition, pile cap 72 makes the spud pile form the interlock with original state soil layer 1 and soft soil layer 2, thereby make the underground structure layer more stable, further effectively avoid the town road on the soft soil foundation to appear the local phenomenon of collapsing.
Utilize the loop wheel machine to hoist steel reinforcement cage 51, cooperation construction workman's manpower assistance-localization real-time, set up steel reinforcement cage 51 in the top of spud pile, then pour waterproof grout toward steel reinforcement cage 51, until waterproof grout submergence steel reinforcement cage 51, last maintenance solidification 14d obtains waterproof layer 5, then lay on the waterproof layer 5 and lay foam cement light soil layer 6, lay rubble layer 3 on foam cement light soil layer 6 at last, wherein the vertical height of waterproof layer 5 is 2 meters, the vertical height of foam cement light soil layer 6 is 0.5 meters, the height of rubble layer 3 is 1.5 meters.
The preparation method of the waterproof cement paste for the waterproof layer comprises the following steps: the composition is prepared from the following components in parts by weight: 25 parts of polystyrene particles, 85 parts of fly ash, 13 parts of polyaluminium chloride, 26 parts of diatomite, 120 parts of wollastonite, 18 parts of wood chips, 168 parts of marble waste residues, 190 parts of Portland cement, 510 parts of stones and 600 parts of water, mixing and grinding the diatomite, the polyaluminium chloride, the polystyrene particles and the wood chips for 35min, adding water for mixing, and stirring uniformly to obtain mixed slurry; mixing and crushing marble waste residues and wollastonite powder into particles with the particle size range of 1-4mm, then adding fly ash, Portland cement and stones, uniformly mixing, then adding mixed slurry, and stirring and reacting for 20min at the temperature of 35 ℃ to obtain the waterproof cement slurry.
The waterproof layer 5 is laid in the soft soil layer 2, so that the infiltration of sewage and rainwater into the concrete layer 9 can be effectively avoided, the concrete layer 9 is prevented from being damaged by volume change caused by gasification or freezing of underground water, cracking of the concrete layer 9 is reduced, and the phenomenon of local collapse of a municipal road surface is reduced; the foam cement light soil layer 6 laid on the waterproof layer 5 plays a role in heat preservation, reduces load and soil pressure, and effectively reduces the problem of engineering settlement caused by insufficient prepressing of a soft foundation road section.
Two slopes that two cofferdams 8 are just right each other are opened and are established into the side slope of echelonment, and the vertical height of every layer of ladder is 1 meter, and the number of layers of ladder in this application embodiment is the three-layer, and every layer of ladder all pre-buried has anchor rope 81, and the concrete construction steps that anchor rope 81 set up are as follows: in order to avoid the damage of the gravel layer 3 of the subsequent construction team, a base plate is laid on the top of the gravel layer 3, holes are drilled along the step-shaped slope of the 45-degree angle cofferdam 8 by a drilling machine, the depth of each hole is 4 meters, the diameter of each hole is 0.5 meter, then high-pressure air injection is carried out on the holes, residual crushed powder in the holes is removed, steel pipes are penetrated into the holes, the outer walls of the steel pipes abut against the inner walls of the holes, a plurality of steel bars penetrate into the steel pipes, cement slurry is poured into the steel pipes finally, and the anchor cables 81 are solidified for 7 days.
Remove the backing plate at rubble layer 3 top to pour cement on rubble layer 3 next, solidify into concrete layer 9 at last, concrete layer 9 is in the ladder slope interlock of cofferdam 8, lays asphalt concrete layer 4 on concrete layer 9 at last, thereby the town road is built.
The concrete layer is prepared by the following specific preparation steps of: 480 parts of cement, 4.3 parts of plasticizer FDN, 125 parts of water, 530 parts of medium sand, 850 parts of broken stone, 10 parts of nano emulsion adhesive, 5 parts of PP fiber and 40 parts of coupling agent vinyl triethoxysilane.
The nano emulsion adhesive is prepared from the following raw materials in parts by weight: 600 parts of butyl acrylate, 30 parts of acrylic acid, 10 parts of glycidyl acrylate and 200 parts of styrene are placed into a polymerization kettle, then 1000 parts of water is added, the constant temperature is kept at 30 ℃ for emulsification, the emulsification time is 30 minutes, then the temperature is increased to 85 ℃ for initiation of polymerization, the polymerization time is 3 hours, finally the temperature is increased to 95 ℃, the temperature is kept for 2 hours, and the nano emulsion adhesive is obtained by filtering and discharging.
And finally, fully mixing cement, a plasticizer FDN4.3, water, medium sand, broken stone, a nano emulsion adhesive, PP fibers and a coupling agent vinyl triethoxysilane, stirring and reacting for 20min at the temperature of 35 ℃ to obtain concrete slurry of the concrete layer, pouring the concrete slurry into the top of the gravel layer in a gradual pouring mode, and curing for 30 days to coagulate the concrete layer.
Two trapezoidal form cofferdams 8 package bed course structures that narrow from bottom to top, can effectively reduce during groundwater infiltration bed course structure, effectively reduce the composition loss phenomenon in the bed course structure, and then effectively avoid the town road on the soft soil foundation the local phenomenon of collapsing to appear, cofferdam 8 adopts the structure of interlock layer upon layer with concrete layer 9, can effectively strengthen the support intensity of town road, many anchor cables 81 that set up in cofferdam 8 increase the anti-skidding resistance of concrete layer 9 between cofferdam 8, make the structural plane be in the state of compacting, effectively improve the wholeness of the echelonment side slope of cofferdam 8, effectively reduce the relative displacement of cofferdam 8 and concrete layer 9, thereby further effectively avoid the town road on the soft soil foundation the local phenomenon of collapsing to appear.
The implementation principle of the application is as follows: inserting a plurality of fixing piles in an undisturbed soil layer 1 and covering the fixing piles with a soft soil layer 2 to obtain a smoother ground, simultaneously driving down a solid supporting foundation by the fixing piles to improve the supporting strength, and then paving a waterproof layer 5 in the soft soil layer 2 to effectively avoid the infiltration of groundwater and rainwater into the concrete layer 9, thereby avoiding the damage to the concrete layer 9 caused by the volume change generated by the gasification or freezing of underground water, reducing the cracking of the concrete layer 9 and further reducing the local collapse phenomenon of the municipal road surface; then, the foam cement light soil layer 6 laid on the waterproof layer 5 plays a role in heat preservation, so that the load is reduced, the soil pressure is lightened, and the problem of engineering settlement caused by insufficient prepressing of a soft foundation road section is effectively solved; and then the laid concrete layer 9 enables the municipal road surface to obtain a base layer with high compressive strength, and the local collapse phenomenon of the municipal road on the soft soil foundation is reduced.
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 (10)
1. Municipal administration road structure in city soft soil foundation area, its characterized in that: including original state soil layer (1), soft soil layer (2), metalling (3), concrete layer (9) and asphalt concrete layer (4), original state soil layer (1) is pegged graft and is had many spud piles, lay in soft soil layer (2) the top of original state soil layer (1), the spud pile bury underground in soft soil layer (2), the top of soft soil layer (2) is provided with waterproof layer (5), foam cement light soil layer (6) have been laid at the top of waterproof layer (5), metalling (3) are laid in the top of foam cement light soil layer (6), concrete layer (9) are laid in the top of metalling (3), asphalt concrete layer (4) are laid in the top of concrete layer (9).
2. The municipal road structure of an urban soft soil foundation zone according to claim 1, wherein: the fixing pile comprises a concrete pile (7), a steel bar cylinder (71) and a pile cap (72), wherein the concrete pile (7) wraps the steel bar cylinder (71), the pile cap (72) is arranged at the top of the concrete pile (7), a steel bar at one end of the steel bar cylinder (71) is inserted into the pile cap (72), a steel bar at the other end of the steel bar cylinder is inserted into an original soil layer (1), and the pile cap (72) jacks up the waterproof layer (5).
3. The municipal road structure of an urban soft soil foundation zone according to claim 1, wherein: the waterproof layer (5) comprises a reinforcement cage (51) and waterproof concrete (52), and the waterproof concrete (52) wraps the reinforcement cage (51).
4. The municipal road structure of an urban soft soil foundation zone according to claim 1, wherein: the concrete cofferdam is characterized by further comprising two cofferdams (8), the soft soil layer (2), the gravel layer (3), the concrete layer (9) and the asphalt concrete layer (4) are arranged between the two cofferdams (8), one side of each cofferdam (8) close to the concrete layer (9) is in a ladder shape, the cross section of each cofferdam (8) is in a ladder shape with the width narrowed from bottom to top, and the concrete layer (9) and the cofferdams (8) are mutually meshed.
5. The municipal road structure of an urban soft soil foundation zone according to claim 4, wherein: and a plurality of anchor cables (81) are obliquely arranged on one stepped surface of the cofferdam (8) in a penetrating manner.
6. The municipal road structure of an urban soft soil foundation zone according to claim 4, wherein: and a drainage channel (82) is formed in the top of the cofferdam (8).
7. Method for constructing urban soft soil foundation zone town road, for building urban soft soil foundation zone town road according to any of claims 1-6, characterized in that it comprises the following construction steps: s1, digging a foundation pit in the undisturbed soil layer (1), and pumping underground water in the foundation pit out; s2, digging soil in an undisturbed soil layer (1) in the foundation pit to obtain a pile pit, and then arranging a fixed pile in the pile pit; s3, paving a soft soil layer (2) on the undisturbed soil layer (1) in the foundation pit, and burying the fixing piles in the soft soil layer (2); s4, paving a waterproof layer (5) on the soft soil layer (2), paving a foam cement light soil layer (6) on the waterproof layer (5), and paving a gravel layer (3); s5, pouring the crushed stone layer (3) to obtain a concrete layer (9), and finally paving the asphalt concrete layer (4) on the concrete layer (9).
8. The method for constructing the municipal road in the urban soft soil foundation zone according to claim 7, wherein the concrete steps of arranging the fixing piles in the pile pits are as follows: and inserting a mould cylinder into the pile pit, inserting a steel bar cylinder (71) into the mould cylinder, pouring cement into the mould cylinder to obtain a concrete pile (7), covering the top of the concrete pile (7) with a mould cap, and pouring cement into the mould cap to obtain a pile cap (72), so that the arrangement of the fixed pile is realized.
9. The method for constructing the municipal road in the urban soft soil foundation zone according to claim 7, wherein the step of providing the waterproof layer (5) in S4 is as follows: and (3) placing the reinforcement cage (51) on the soft soil layer (2), pouring waterproof cement paste into the foundation pit until the reinforcement cage (51) is immersed by the waterproof cement paste, and finally curing to obtain the waterproof layer (5).
10. The method of constructing a town road in an urban soft soil foundation zone according to claim 7, wherein: cofferdams (8) are arranged on two sides of the foundation pit dug in the step S1, a drainage channel (82) is formed in the top of each cofferdam (8), and then the mutually opposite surfaces of the two cofferdams (8) are formed into a layer of ladder; before the concrete layer (9) is poured in the S5, holes are obliquely drilled on the stepped surface of the cofferdam (8), then the anchor cables (81) are arranged in the drilled holes in a penetrating mode, concrete is poured in the holes, and finally the concrete layer (9) meshed with the cofferdam (8) is poured on the gravel layer (3).
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