CN112227126A - Highway foundation reinforcing structure in soft soil area and construction method and supervision method thereof - Google Patents
Highway foundation reinforcing structure in soft soil area and construction method and supervision method thereof Download PDFInfo
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- CN112227126A CN112227126A CN202011017778.5A CN202011017778A CN112227126A CN 112227126 A CN112227126 A CN 112227126A CN 202011017778 A CN202011017778 A CN 202011017778A CN 112227126 A CN112227126 A CN 112227126A
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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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- E01C3/00—Foundations for pavings
Abstract
The utility model relates to a soft soil district highway foundation reinforced structure and construction method, the method of managing thereof, it includes the pitch layer that top-down set gradually, soft soil layer and hard soil layer, a plurality of reinforcement mound has been buried underground along highway length direction in the soft soil layer, the length direction who strengthens the mound is the same with the width direction of highway, it is provided with a plurality of reinforcing steel plate to fix between the adjacent reinforcement mound, reinforcing steel plate's both ends all downwarping, the fixed a plurality of reinforced column that is provided with in bottom of strengthening the mound, the bottom of reinforced column is inserted and is located in the hard soil layer. This application has and avoids the large tracts of land to dig out the weak soil, improves the support intensity and the stability of road bed, reduces the road surface and appears the effect of the phenomenon of collapsing.
Description
Technical Field
The application relates to the field of highway engineering, in particular to a soft soil area highway foundation reinforcing structure and a construction method and a supervision method thereof.
Background
The roadbed is a foundation of a road surface and is an earth structure formed by excavation or filling. The roadbed mainly has the functions of providing necessary conditions for pavement laying and driving operation, bearing static load and dynamic load of pavement and traffic load, and transmitting and diffusing the load to the deep part of the foundation. For soft soil areas, the subgrade in the soft soil area is generally treated to ensure the bearing capacity and stability of the pavement.
At present, the roadbed treatment method in the soft soil area mainly adopts a digging and filling method, namely digging and filling soft soil, and adopting qualified filling materials to carry out layered rolling and backfilling. In view of the above-mentioned related technologies, the inventor believes that the excavation and replacement filling method needs to excavate soft soil in a large area, and the support effect of the backfilled soil layer on the roadbed is limited, so that when the road surface bears a large load, the situation of road surface collapse often occurs, and the normal operation of road traffic is affected.
Disclosure of Invention
In order to avoid excavating soft soil in a large area, improve the supporting strength and stability of a roadbed and reduce the phenomenon of collapse of a road surface, the application provides a soft soil area highway foundation reinforcing structure and a construction method and a supervision method thereof.
In a first aspect, the application provides a soft soil area highway foundation reinforcing structure and a construction method and a supervision method thereof, and the following technical scheme is adopted:
the utility model provides a soft soil district highway foundation reinforced structure, includes asphalt layer, soft soil layer and the hard soil layer that top-down set gradually, has buried a plurality of along highway length direction in the soft soil layer and has strengthened the mound, strengthens the length direction of mound the same with the width direction of highway, and adjacent strengthens fixedly between the mound and be provided with a plurality of reinforcing steel plate, and reinforcing steel plate's both ends are all downwarping, strengthens the fixed a plurality of reinforced column that is provided with in bottom of mound, and the bottom of reinforced column is inserted and is located in the hard soil layer.
By adopting the technical scheme, the reinforcing piers are arranged in the soft soil layer, the reinforcing piers can support the road surface, the reinforcing columns inserted into the hard soil layer are arranged at the bottoms of the reinforcing piers, the hard soil layer ensures the stability of the reinforcing columns, the load bearing capacity of the reinforcing columns is greatly improved, and the reinforcing columns support the reinforcing piers, so that the supporting strength and the stability of the roadbed are improved; set up the reinforcing steel plate between adjacent enhancement mound, the reinforcing steel plate plays further supporting role for the road surface, and the both ends of reinforcing steel plate are all downwarping, make the reinforcing steel plate have certain elastic force in vertical direction, when the reinforcing steel plate receives vertical decurrent load, elastic deformation can take place at the middle part of reinforcing steel plate, under the effect of its self restoring force, can play the supporting role to the road surface, thereby further improved the support intensity and the stability of road bed, realize the reinforcing role to soft soil district road bed, not only avoid excavating the weak soil by a large scale, also can reduce the phenomenon that the road surface appears collapsing by a wide margin.
Preferably, the top surface and the bottom surface of the reinforced steel plate are both fixedly provided with a plurality of vertical reinforced steel bars.
Through adopting above-mentioned technical scheme, all set up the reinforcing bar at the top surface and the bottom surface of reinforcing steel sheet, the reinforcing bar can strengthen compressive strength and bearing capacity of soil layer in vertical side between the adjacent pier of strengthening, improves the support intensity and the stability to the road surface between the adjacent pier of strengthening, has improved the even degree of whole atress of road bed, has further reduced the phenomenon that the road surface appears collapsing.
Preferably, a concrete layer is poured between the bottoms of the adjacent reinforcing piers.
Through adopting above-mentioned technical scheme, pouring concrete layer between adjacent enhancement mounds, concrete layer can play the supporting role to the soil body between the adjacent enhancement mound to play the isolation effect to the soil body of concrete layer top and below, further improved the support intensity and the stability of road bed, reduce the phenomenon that the road surface appears collapsing.
Preferably, a crushed stone layer is laid below the asphalt layer.
Through adopting above-mentioned technical scheme, lay the metalling below the pitch layer, not only can make the road surface have good effect of permeating water, can also play the supporting role to the pitch layer, strengthened the ability that the road surface bore the load, improved the support intensity and the stability to the road surface once more.
Preferably, both ends of the reinforcing steel plate extend into two adjacent reinforcing piers respectively.
Through adopting above-mentioned technical scheme, extend to adjacent two respectively with the both ends of strengthening the steel sheet and strengthen in the mound, can improve the joint strength who strengthens the steel sheet and strengthen between the mound to guaranteed the supporting role of strengthening the steel sheet to the adjacent soil body of strengthening between the mound, reduced and strengthened the cracked phenomenon of appearing after the steel sheet uses for a long time, prolonged the life of strengthening the steel sheet, and improved the bulk strength and the stability of road bed.
Preferably, a sand layer is filled between every two adjacent reinforcing piers, and the reinforcing steel plates are located in the sand layer.
By adopting the technical scheme, the sandy soil layer is filled between the adjacent reinforced piers, the sandy soil in the sandy soil layer has smaller particle size and high compactness, so that the load bearing capacity of the soil body between the adjacent reinforced piers is enhanced, and the supporting strength and the stability of the roadbed are further improved.
Preferably, a reinforcement cage is embedded in the reinforcing pier.
Through adopting above-mentioned technical scheme, bury the steel reinforcement cage underground in strengthening the mound, can play the additional strengthening to the compressive capacity who strengthens mound self, improved the anti-crack performance who strengthens the mound simultaneously, prolonged the life who strengthens the mound, greatly strengthened the supporting role of strengthening the mound to the road surface.
Preferably, the cross-sectional area of the reinforcing pier gradually increases from top to bottom.
Through adopting above-mentioned technical scheme, strengthen the cross-sectional area top-down crescent of mound for strengthen the mound and have good stability, thereby play stable supporting role to the road surface, improved the stability on road surface, further reduce the road surface and appear the phenomenon of caving.
In a second aspect, the application provides a soft soil area highway foundation reinforcing structure and a construction method and a supervision method thereof, and the following technical scheme is adopted:
a construction method of a soft soil area highway foundation reinforcing structure comprises the following steps:
s1, pouring reinforcing piers, namely digging a plurality of foundation pits in a soft soil layer along the length direction of a highway, driving a plurality of reinforcing columns in the foundation pits, inserting the bottom ends of the reinforcing columns into the hard soil layer, positioning the top ends of the reinforcing columns in the foundation pits, digging through adjacent foundation pits, placing a reinforcement cage in each foundation pit, erecting templates outside the reinforcement cage, erecting a plurality of reinforcing steel plates between the adjacent foundation pits, respectively extending the two ends of each reinforcing steel plate to the position between the templates in the adjacent foundation pits, and pouring concrete between the templates in the foundation pits to form the reinforcing piers;
s2, pouring a concrete layer, namely tamping soil bodies between adjacent reinforced piers after the reinforced piers are solidified and formed, and then pouring concrete on the soil bodies between the adjacent reinforced piers to form the concrete layer;
s3, backfilling a sand layer, namely after the concrete layer is solidified and formed, filling sand between the adjacent reinforced piers for multiple times in a layered mode, and compacting to form the sand layer, so that the top surface of the sand layer is flush with the top surfaces of the reinforced piers;
s4, paving a gravel layer and an asphalt layer, namely paving gravel on the top surfaces of the sand layer and the reinforced pier to form the gravel layer, and paving the asphalt layer on the top surface of the gravel layer.
Through adopting above-mentioned technical scheme, at first, beat into the enhancement post in the foundation ditch, play stable supporting role for strengthening the mound, then the mound is strengthened in the pouring of foundation ditch, and pre-buried enhancement steel sheet between adjacent enhancement mound, at the adjacent concrete layer of pouring between the mound of strengthening again, and fill into sand layer above concrete layer, thereby play the strengthening effect to the roadbed, avoid excavating the weak soil by a large scale, then lay metalling and pitch layer, realize the strengthening process to soft soil district road surface, the roadbed is strengthened load and bearing capacity, the support intensity and the stability of roadbed has greatly been improved, reduce the phenomenon that the road surface appears collapsing.
In a third aspect, the application provides a soft soil area highway foundation reinforcing structure and a construction method and a supervision method thereof, and the following technical scheme is adopted:
a supervision method for a soft soil area highway foundation reinforced structure comprises the following steps:
a. testing the depth of the reinforcing column, namely measuring the elevation of the top end of the reinforcing column after the reinforcing column is driven in, determining the elevation of the bottom end of the reinforcing column, and ensuring that the bottom end of the reinforcing column is positioned in a hard soil layer in a design specification;
b. quality inspection of the reinforced steel plate and the reinforced steel bar: checking whether the sizes, the models and the mechanical properties of the steel plates and the steel bars are consistent with a drawing through delivery reports of the steel plates and the steel bars, and photographing for base reservation during detection;
c. performing performance detection on the reinforced pier, namely manufacturing a concrete test block when the reinforced pier is poured, and performing performance detection on the concrete test block after 28 days of maintenance;
d. detecting the compactness of the sandy soil layer, namely detecting the compactness of the sandy soil by a cutting ring sampling method after each layer of sandy soil is compacted;
e. and (3) thickness detection of the crushed stone layer, namely measuring the elevation of the crushed stone layer before laying the asphalt layer to ensure that the thickness of the crushed stone layer meets the design standard.
By adopting the technical scheme, the depth detection and inspection of the reinforcing column can ensure that the bottom end of the reinforcing column is inserted into a hard soil layer, and the reinforcing column plays a stable supporting role on the reinforcing pier; the quality of the reinforced steel plate and the reinforced steel bar is inspected to ensure that the reinforced steel plate and the reinforced steel bar have no quality defect, so that the reinforced steel plate and the reinforced steel bar can play a reinforcing effect on the stability and the supporting effect of the roadbed; the performance of the reinforced pier is detected, and the reinforced pier is ensured to have good compressive property and crack resistance, so that the reinforced pier has a stable supporting effect on a road surface; the compactness of the sand layer is detected, so that the sand layer is tamped tightly, the stability and the compressive capacity of the roadbed are further improved, and the phenomenon of collapse of the road surface is reduced; the thickness to the rubble layer detects, ensures that the thickness on rubble layer accords with the design requirement to strengthened the stability on road surface and the bearing capacity to the load, ensured the support intensity and the stability of soft soil area road bed.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the reinforcing pier, the reinforcing column and the reinforcing steel plate are arranged, the reinforcing pier can support the road surface, the reinforcing column supports the reinforcing pier, the reinforcing steel plate improves the supporting strength and stability of the roadbed, soft soil is prevented from being dug in a large area, and the phenomenon that the road surface collapses is greatly reduced;
2. by arranging the reinforcing steel bars, the compressive strength and the bearing capacity of the soil layer between the adjacent reinforcing piers in the vertical direction are enhanced, and the phenomenon of collapse of the road surface is further reduced;
3. the reinforcing cage is embedded in the reinforcing pier, so that the self pressure resistance of the reinforcing pier is enhanced, the crack resistance of the reinforcing pier is improved, and the supporting effect of the reinforcing pier on the pavement is enhanced;
4. through the degree of depth detection inspection to the reinforced column, inspect the quality of reinforcing steel plate and reinforcing bar, detect the performance of strengthening the mound, detect the closely knit degree of sand layer and detect the thickness on metalling, ensure the support intensity and the stability of soft soil district road bed, further reduce the phenomenon that the road surface appears collapsing.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
fig. 2 is a partial structural view for showing a reinforcing bar.
Description of reference numerals: 1. an asphalt layer; 2. a crushed stone layer; 3. a sandy soil layer; 4. reinforcing piers; 41. a reinforcement cage; 5. reinforcing a steel plate; 51. reinforcing steel bars; 6. a reinforcement column; 7. a concrete layer; 8. a soft soil layer; 9. a hard soil layer.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses soft soil district highway foundation reinforced structure.
The utility model provides a soft soil district highway foundation reinforced structure, refers to figure 1, includes asphalt layer 1, metalling 2, soft soil layer 8 and the hard soil layer 9 that top-down set gradually, is provided with a plurality of along highway length direction between soft soil layer 8 and the metalling 2 and strengthens mound 4, and it has sand layer 3 to fill between the adjacent mound 4 of strengthening. Strengthen mound 4, sand bed 3 and gravel layer 2 and can strengthen the stability of road bed, improved the support intensity on road surface, reduce the phenomenon that the road surface appears collapsing.
Referring to fig. 1, the length direction of the reinforcing pier 4 is the same as the width direction of the road, the longitudinal section of the reinforcing pier 4 is trapezoidal, and the cross-sectional area of the reinforcing pier 4 gradually increases from top to bottom. A reinforcement cage 41 is embedded in the reinforcing pier 4; the bottom of strengthening mound 4 is provided with a plurality of and strengthens post 6, strengthens post 6 along strengthening the length direction evenly distributed of mound 4, and the top of strengthening post 6 is inserted and is located in strengthening mound 4, and the bottom of strengthening post 6 is the point form, and strengthening post 6 passes soft soil layer 8, and the bottom of strengthening post 6 is inserted and is located in hard soil layer 9.
The arrangement of the reinforcement cage 41 and the shape of the reinforcing pier 4 improve the compressive strength and the crack resistance of the reinforcing pier 4, so that the reinforcing pier 4 can play a role in stably supporting the pavement; meanwhile, the bottom of the reinforcing column 6 is inserted into the hard soil layer 9, so that the adverse effect of the soft soil layer 8 on the bearing capacity of the reinforcing pier 4 can be eliminated as far as possible, the stress condition of the reinforcing pier 4 is improved, the load bearing capacity of the reinforcing pier 4 is greatly improved, the soft soil is prevented from being dug out in a large area, the supporting strength and the stability of the roadbed are improved, and the phenomenon of collapse of the road surface is greatly reduced.
Referring to fig. 1, the reinforcing steel plates 5 are fixedly arranged between the adjacent reinforcing piers 4, the reinforcing steel plates 5 are evenly provided with a plurality of along the length direction of the reinforcing piers 4, the reinforcing steel plates 5 are also provided with a plurality of along the vertical direction, the reinforcing steel plates 5 are horizontally embedded in the sand layer 3, the two ends of the reinforcing steel plates 5 are bent downwards, and the two ends of the reinforcing steel plates 5 extend into the adjacent two reinforcing piers 4 respectively.
Reinforcing steel plate 5 plays stable supporting role to the road surface between adjacent enhancement mound 4, and when reinforcing steel plate 5 received vertical decurrent load, vertical decurrent elastic deformation can take place in reinforcing steel plate 5's middle part, under the effect of its self restoring force, can apply vertical ascending power to the road surface to play supporting role to the road surface, further improved the support intensity and the stability of road bed, the reinforcing effect to soft soil district road bed is realized.
Referring to fig. 2, a plurality of vertical reinforcing steel bars 51 are fixedly arranged on both the top surface and the bottom surface of the reinforcing steel plate 5, and the reinforcing steel bars 51 are buried in the sand layer 3. The reinforcing steel bars 51 reinforce the compressive strength and the bearing capacity of the soil layer between the adjacent reinforcing piers 4 in the vertical direction, and further reduce the phenomenon of collapse of the road surface.
Referring to fig. 1, a concrete layer 7 is poured between the bottoms of the adjacent reinforced piers 4, and the concrete layer 7 is positioned between a soft soil layer 8 and a sand layer 3. Concrete layer 7 can play the supporting role to sand layer 3 to play the isolation to soft soil layer 8 and sand layer 3, eliminate soft soil layer 8 to sand layer 3's influence as far as possible, improved the support intensity and the stability between adjacent enhancement mound 4.
The implementation principle of the soft soil area highway foundation reinforced structure of the embodiment of the application is as follows: the bottom of enhancement post 6 is inserted and is located hard soil layer 9, the adverse effect of soil layer to strengthening mound 4 bearing capacity has been eliminated as far as possible, improve the stress condition who strengthens mound 4, the ability of strengthening mound 4 bearing load has greatly been improved, reinforcing steel plate 5 plays stable supporting role to the road surface between the adjacent enhancement mound 4, reinforcing steel bar 51 has strengthened the compressive strength and the bearing capacity of soil layer on vertical side between the adjacent enhancement mound 4, concrete layer 7 can play the supporting role to sand layer 3, and play the barrier effect to soft soil layer 8 and sand layer 3, eliminate the influence of soft soil layer 8 to sand layer 3 as far as possible, thereby realize the consolidation to soft soil district road bed, avoid excavating the weak soil by a large scale, the support strength and the stability of road bed have been improved, the phenomenon that the road surface appears collapsing has been reduced by a wide margin.
The embodiment of the application further discloses a construction method of the soft soil area highway foundation reinforcing structure.
Referring to fig. 1 and 2, a construction method of a soft soil area highway foundation reinforcement structure includes the following steps:
s1, pouring the reinforcing pier 4:
during construction, firstly digging a plurality of foundation pits at the top of a soft soil layer 8 along the length direction of a road, wherein the length direction of the foundation pits is the same as the width direction of the road, then vertically driving a plurality of reinforcement columns 6 into the foundation pits along the length direction of the foundation pits, so that the bottom ends of the reinforcement columns 6 are inserted into a hard soil layer 9, and the top ends of the reinforcement columns are positioned in the foundation pits; then excavating a soft soil layer 8 between adjacent foundation pits, placing a reinforcement cage 41 in each foundation pit, erecting a template in each foundation pit, enabling the longitudinal section inside each template to be trapezoidal, enabling the size of the cross section of the top end inside each template to be smaller than that of the cross section of the bottom end inside each template, uniformly erecting a plurality of reinforcing steel plates 5 between the adjacent foundation pits, welding a plurality of vertical reinforcing steel bars 51 on the top surfaces and the bottoms of the reinforcing steel plates 5, enabling the two ends of each reinforcing steel plate 5 to bend downwards, and enabling the two ends of each reinforcing steel plate 5 to extend to the space between the templates in the adjacent foundation pits respectively; at this time, concrete is poured between the formworks in the foundation pit to form the reinforcing pier 4.
Strengthen mound 4 and can play the supporting role to the road surface, strengthen post 6 and insert and locate in hardpan 9, ensured to strengthen post 6 and the stability of strengthening mound 4, greatly improved and strengthened the ability that mound 4 bore the load, reinforcing steel plate 5 plays further supporting role for the road surface, has improved the support intensity and the stability of road bed, avoids excavating the weak soil by a large scale, reduces the phenomenon that the road surface appears collapsing by a wide margin.
S2, pouring concrete layer 7:
after the reinforced piers 4 are solidified and formed, soil bodies on the top surfaces of the soft soil layers 8 between the adjacent reinforced piers 4 are tamped, then templates are built between the adjacent reinforced piers 4, and concrete is poured on the soft soil layers 8 to form concrete layers 7. The concrete layer 7 plays a supporting role for the sand layer 3 between the adjacent reinforced piers 4 and plays an isolating role for the sand layer 3 and the soft soil layer 8, so that the supporting strength and the stability of the roadbed are further improved, and the phenomenon of collapse of the road surface is reduced.
S3, backfilling a sand layer 3:
after the concrete layer 7 is solidified and formed, sand is filled between the adjacent reinforced piers 4 in a layered mode for multiple times, the sand filled in the layered mode is tamped tightly, the sand layer 3 is formed, and the top surface of the sand layer 3 is flush with the top surfaces of the reinforced piers 4. The sandy soil in the sandy soil layer 3 has smaller grain diameter and high compactness, strengthens the load bearing capacity of the soil body between the adjacent reinforced piers 4, and further improves the supporting strength and the stability of the roadbed.
S4, paving the gravel layer 2 and the asphalt layer 1:
after the sandy soil layer 3 is tamped, paving broken stones on the top surfaces of the sandy soil layer 3 and the reinforced piers 4 to form a broken stone layer 2; and then the asphalt layer 1 is laid on the top surface of the gravel layer 2, so that the reinforcement process of the roadbed in the soft soil area is realized, the load bearing capacity of the roadbed is enhanced, and the supporting strength and the stability of the roadbed are improved.
The embodiment of the application further discloses a supervision method of the soft soil area highway foundation reinforcing structure.
Referring to fig. 1 and 2, a method for supervising a soft soil area highway foundation reinforcing structure includes the following steps:
a. and (4) depth inspection of the reinforcing column 6:
after the reinforcing column 6 is driven into the pile, the elevation of the top end of the reinforcing column 6 is measured by using a total station, the elevation of the bottom end of the reinforcing column 6 is determined, and the bottom end of the reinforcing column 6 is ensured to be positioned in a hard soil layer 9 in a design specification, so that the reinforcing column 6 is ensured to play a stable supporting role on the reinforcing pier 4.
b. Quality inspection of the reinforced steel plate 5 and the reinforced steel bar 51:
before the construction, whether the size, the model and the mechanical properties of the steel plate and the reinforcing steel bar are consistent with the drawing or not is checked through the delivery report of the steel plate and the reinforcing steel bar, and photographing is carried out when detecting, so that the quality defect of the reinforced steel plate 5 and the reinforced steel bar 51 is avoided, and the reinforced steel plate 5 and the reinforced steel bar 51 can play a reinforcing effect on the stability and the supporting effect of the roadbed.
c. And (3) detecting the performance of the reinforced pier 4:
when the reinforced pier 4 is poured, the concrete test block is manufactured at the same time, the performance of the concrete test block is detected after the concrete test block is maintained for 28 days, the compression resistance and the crack resistance of the concrete test block are detected, and the reinforced pier 4 is ensured to play a stable supporting role on the pavement.
d. And (3) detecting the compactness of the sand layer:
when filling sand layer 3, after each layer of sand is tamped, the compactness of the sand is detected by a cutting ring sampling method, so that the sand layer 3 is tamped compactly, and the sand layer 3 has good stability and compressive capacity, thereby reducing the phenomenon of collapse of the road surface.
e. And (3) detecting the thickness of the crushed stone layer 2:
before laying asphalt layer 1, measure the elevation of metalling 2 with the total powerstation, ensure that the thickness of metalling 2 satisfies the design standard to ensure that metalling 2 plays stable supporting role to the road surface, improve the bearing capacity of road surface to the load, ensure the support intensity and the stability of soft soil district road bed.
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. The utility model provides a soft soil district highway foundation reinforced structure, asphalt layer (1) that sets gradually including top-down, soft soil layer (8) and hard soil layer (9), a serial communication port, a plurality of enhancement mound (4) have been buried underground along highway length direction in soft soil layer (8), the length direction who strengthens mound (4) is the same with the width direction of highway, it strengthens steel sheet (5) to fix a plurality of between mound (4) to be provided with adjacent enhancement, the both ends of strengthening steel sheet (5) are all downwarping, the bottom of strengthening mound (4) is fixed and is provided with a plurality of reinforcement post (6), the bottom of reinforcement post (6) is inserted and is located in hard soil layer (9).
2. A soft soil area highway foundation reinforcing structure according to claim 1, wherein a plurality of vertical reinforcing steel bars (51) are fixedly arranged on the top surface and the bottom surface of the reinforcing steel plate (5).
3. A soft soil area highway foundation reinforcing structure according to claim 1, characterized in that a concrete layer (7) is poured between the bottoms of adjacent reinforcing piers (4).
4. A soft soil area highway foundation reinforcing structure according to claim 1, characterized in that a gravel layer (2) is laid under said asphalt layer (1).
5. A soft soil area highway foundation reinforcing structure according to claim 1, wherein both ends of said reinforcing steel plate (5) extend into two adjacent reinforcing piers (4), respectively.
6. A soft soil area highway foundation reinforcing structure according to claim 1, characterized in that a sand layer (3) is filled between adjacent reinforcing piers (4), and the reinforcing steel plates (5) are positioned in the sand layer (3).
7. A soft soil area highway foundation reinforcing structure according to claim 1, characterized in that a reinforcement cage (41) is pre-buried in said reinforcement pier (4).
8. A soft soil area highway foundation reinforcing structure according to claim 1, wherein the cross-sectional area of said reinforcing piers (4) is gradually increased from top to bottom.
9. A construction method of a soft soil area highway foundation reinforcing structure is characterized by comprising the following steps:
s1, pouring reinforcing piers (4), namely digging a plurality of foundation pits in a soft soil layer (8) along the length direction of a road, driving a plurality of reinforcing columns (6) into the foundation pits, inserting the bottom ends of the reinforcing columns (6) into a hard soil layer (9), positioning the top ends of the reinforcing columns in the foundation pits, then digging through the adjacent foundation pits, placing reinforcement cages (41) in the foundation pits, erecting templates on the outer sides of the reinforcement cages (41), erecting a plurality of reinforcing steel plates (5) between the adjacent foundation pits, respectively extending the two ends of each reinforcing steel plate (5) to the position between the templates in the adjacent foundation pits, and then pouring concrete between the templates in the foundation pits to form the reinforcing piers (4);
s2, pouring a concrete layer (7), namely tamping soil between adjacent reinforced piers (4) after the reinforced piers (4) are solidified and formed, and then pouring concrete on the soil between the adjacent reinforced piers (4) to form the concrete layer (7);
s3, backfilling the sandy soil layer (3), namely after the concrete layer (7) is solidified and formed, filling sandy soil between the adjacent reinforced piers (4) for multiple times in a layering manner, and tamping tightly to form the sandy soil layer (3) so that the top surface of the sandy soil layer (3) is flush with the top surfaces of the reinforced piers (4);
s4, paving a gravel layer (2) and an asphalt layer (1), namely paving gravel on the top surfaces of the sand layer (3) and the reinforced pier (4) to form the gravel layer (2), and then paving the asphalt layer (1) on the top surface of the gravel layer (2).
10. A supervision method for a soft soil area highway foundation reinforced structure is characterized by comprising the following steps:
a. performing depth inspection on the reinforcing column (6), namely measuring the elevation of the top end of the reinforcing column (6) after the reinforcing column (6) is driven in, determining the elevation of the bottom end of the reinforcing column (6) and ensuring that the bottom end of the reinforcing column (6) is positioned in a hard soil layer (9) in a design specification;
b. quality inspection of the reinforced steel plate (5) and the reinforced steel bar (51): checking whether the sizes, the models and the mechanical properties of the steel plates and the steel bars are consistent with a drawing through delivery reports of the steel plates and the steel bars, and photographing for base reservation during detection;
c. detecting the performance of the reinforced pier (4), namely manufacturing a concrete test block when the reinforced pier (4) is poured, and detecting the performance of the concrete test block after curing for 28 days;
d. the compactness of the sand layer (3) is detected, namely after each layer of sand is compacted, the compactness of the sand is detected by a cutting ring sampling method;
e. and (3) thickness detection of the crushed stone layer (2), namely measuring the elevation of the crushed stone layer (2) before laying the asphalt layer (1) to ensure that the thickness of the crushed stone layer (2) meets the design standard.
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| CN202011017778.5A CN112227126A (en) | 2020-09-24 | 2020-09-24 | Highway foundation reinforcing structure in soft soil area and construction method and supervision method thereof |
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