Novel widening and heightening pile type reinforced embankment construction method

Abstract

The invention discloses a novel widening and heightening pile-supported reinforced embankment construction method, and belongs to the technical field of road change and extension construction, and the novel widening and heightening pile-supported reinforced embankment construction method comprises the following steps: S1, carrying out retaining wall construction operation on two sides of an original embankment; s2, layered soil filling operation is carried out; s3, piling construction operation is started on the filling surface, and construction operation of a pile cap is carried out at the top end of the pile body; s4, the reinforced lattice beams are constructed, so that the reinforced lattice beams are connected with the pile caps; s5, the laying work of the part between the piles is conducted, and geosynthetics are flatly laid on pile caps and the tops of the reinforced lattice beams; and S6, backfill soil construction, cement soil construction and pavement structure construction are sequentially conducted on the tops of the multiple pile bodies. Construction can be directly carried out on the original embankment, so that resource waste and time cost increase caused by large-scale dismantling and reconstruction are avoided, meanwhile, all the structures cooperate with one another to enable the expanded and heightened embankment to form a stable mechanical system, and it is guaranteed that the embankment stably and efficiently operates within a long time.

Description

Technical Field

[0001] The invention relates to the technical field of road reconstruction and expansion, and in particular to a novel construction method for widening and heightening pile-supported reinforced embankments. Background Art

[0002] With the growth of traffic demand, the innovation of technical standards, and the problems of road damage and aging facilities faced by old roads, the original old roads need to be maintained and expanded to meet the growing traffic demand. For sections with poor geological conditions, their bearing capacity is poor, and the settlement deformation is large after bearing the load, so proper foundation treatment is often required.

[0003] As a relatively mature foundation treatment technology, pile-supported reinforced embankment has outstanding advantages in improving foundation bearing capacity and reducing deformation and settlement. It reinforces the embankment by setting pile foundations on soft foundations and laying geosynthetics reinforced cushions on the pile tops. Through the "soil arch effect" and "tensile membrane effect", the soil stress can be redistributed, and more stress can be transferred to the pile top and its surroundings, reducing the internal stress of the soft soil, thereby achieving the effect of improving the bearing capacity of the foundation. However, in road reconstruction and expansion projects, due to the previous small traffic demand and the current large traffic demand, many old roads need to be expanded. Among them, due to the differences between the new and old specifications, many roads need to be raised. In this case, the construction of pile-supported reinforced embankments is more difficult, and often requires large-scale excavation to remove the superstructure and fill for construction, which greatly increases the construction cost. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a new method for constructing a widened and elevated pile-supported reinforced embankment, which can be directly used on the built embankment without removing the original embankment's superstructure and fill, thereby reducing construction costs.

[0005] A novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention comprises:

[0006] S1: Along the extension direction of the road, a plurality of retaining wall support piles are driven into the foundations on both sides of the original embankment, and according to the positions of the plurality of retaining wall support piles, retaining wall construction operations are carried out on both sides of the original embankment to form a retaining structure of the original embankment;

[0007] S2: Carry out layered filling operation and continue filling until the filling surface elevation of the filling layer reaches the preset pile construction surface elevation;

[0008] S3: Start piling construction work on the fill surface, and after all the piles are driven into the preset positions, start pile cap construction work on the top of the piles;

[0009] S4: construct reinforced lattice beams and connect the reinforced lattice beams with the pile caps;

[0010] S5: Lay the filling material between the piles, ensure that the filling material is evenly laid to be flush with the top of the pile cap, lay the geosynthetics evenly on the pile cap and the top of the reinforced lattice beam, and cover the filling material between the piles to form a reinforced cushion layer;

[0011] S6: Backfill soil construction, cement soil construction and pavement structure construction are carried out in sequence on the top of multiple piles.

[0012] The novel widened and heightened pile-supported reinforced embankment construction method according to the embodiment of the present invention has at least the following beneficial effects: retaining walls are constructed on both sides of the original embankment for enclosure, and the original embankment within the enclosed area of ​​the retaining walls is filled with soil in layers, and then pile driving, pile caps and reinforced lattice beams are sequentially carried out on the fill surface, and after the fill is laid between the piles until it is flush with the top of the pile cap, geosynthetics are covered on the fill to form a reinforced cushion layer, and finally the pavement structure is constructed on the top of the pile body to complete the embankment construction. Thus, construction is carried out directly on the original embankment. On the one hand, there is no need to excavate the original road and remove the upper structure and fill of the original embankment, thereby avoiding the waste of resources and the increase in time cost caused by large-scale demolition and reconstruction. On the other hand, the various structures cooperate with each other to form a stable mechanical system after the widening and heightening of the embankment, which can effectively resist the interference of external factors such as long-term vehicle loads and natural weathering erosion, thereby reducing maintenance costs and ensuring the stable and efficient operation of the embankment for a long time.

[0013] According to some embodiments of the present invention, in S2, after each layer of soil is filled, the soil is compacted to ensure the density of the soil.

[0014] According to some embodiments of the present invention, in S3, constructing a pile cap on a pile body includes: obtaining a preset installation position of a template; installing the template according to the preset installation position; making steel bars and embedded parts, and installing the steel bars and embedded parts on the template; and pouring concrete for the pile cap in the template.

[0015] According to some embodiments of the present invention, in S5, the filler is crushed stone or medium-coarse sand.

[0016] According to some embodiments of the present invention, in S5, the geosynthetics are fixed to the pile cap and the lattice beam using connectors.

[0017] According to some embodiments of the present invention, in S5, the geosynthetics are laid in multiple layers, and fillers are laid between two adjacent layers of geosynthetics. According to some embodiments of the present invention, the fillers laid between two adjacent layers of geosynthetics are leveled after being laid flat to prevent uneven filling thickness.

[0018] According to some embodiments of the present invention, after the level detection of the filler on the geosynthetics is completed, a roller is used for static compaction.

[0019] According to some embodiments of the present invention, in S6, the cement soil construction includes: cleaning the base layer and removing debris on the base layer to make the base layer flat; installing side molds and middle partition molds to evenly spread the cement soil in the molds; vibrating the spread cement soil to ensure that the cement soil is dense; after the cement soil reaches a preset strength, removing the molds.

[0020] According to some embodiments of the present invention, in S6, the pavement structure construction includes: cleaning the dirt, dust and debris on the cement soil to ensure that the cement soil layer is flat and clean; laying the pavement structure material evenly on the cement soil; compacting and trimming the pavement structure material to ensure the density and stability of the pavement structure material.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 It is a structural schematic diagram of a novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the process of driving retaining wall support piles in the novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the process of constructing a retaining wall in a novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the piling process in the novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the process of constructing a pile cap in a novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the process of constructing reinforced lattice beams and laying between piles in a novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure after the road widening is completed;

[0030] Figure 8It is a schematic flow chart of a novel method for constructing a widened and elevated pile-supported reinforced embankment according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] The original embankment is 100, the original embankment slope foot is 110, and the original embankment road surface height is 120;

[0033] New embankment 200, retaining wall support piles 210, retaining wall 220, pile body 230, pile cap 231, reinforced lattice beam 240, backfill 250, cement soil 260, pavement structure 270;

[0034] Conventional widening and raising of the embankment slope foot by 300. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] refer to Figures 1 to 8 A novel method for constructing a widened and elevated pile-supported reinforced embankment according to an embodiment of the present invention is described.

[0039] like Figure 1 and Figure 8 As shown, a novel widening and heightening pile-supported reinforced embankment construction method according to an embodiment of the present invention comprises:

[0040] S1: Along the extension direction of the road, a plurality of retaining wall support piles 210 are driven into the foundations on both sides of the original embankment 100, and according to the positions of the plurality of retaining wall support piles 210, a retaining wall 220 is constructed on both sides of the original embankment 100 to form a retaining structure of the original embankment 100;

[0041] S2: Carry out layered filling operation and continue filling until the filling surface elevation of the filling layer reaches the preset pile body 230 construction surface elevation;

[0042] S3: Starting the piling operation on the fill surface, after all the pile bodies 230 are driven into the preset positions, carrying out the construction operation of the pile cap 231 at the top of the pile body 230;

[0043] S4: constructing the reinforced lattice beam 240 and connecting the reinforced lattice beam 240 to the pile cap 231;

[0044] S5: Laying work is performed between the piles to ensure that the filler is evenly laid to be flush with the top of the pile cap 231, and the geosynthetics are evenly laid on the pile cap 231 and the top of the reinforced lattice beam 240, and the geosynthetics are covered on the filler between the piles to form a reinforced cushion layer;

[0045] S6: backfill soil 250 construction, cement soil 260 construction and road surface structure 270 construction are sequentially performed on the top of the plurality of piles 230 .

[0046] It can be seen that the retaining walls 220 are constructed on both sides of the original embankment 100 for enclosure, and the original embankment 100 within the enclosed area of ​​the retaining walls 220 is filled in layers, and then the construction of pile driving, pile caps 231 and reinforced grid beams 240 is carried out in sequence on the filling surface. After the filling material is laid between the piles until it is flush with the top of the pile cap 231, the geosynthetics are covered on the filling material to form a reinforced cushion layer, and finally the pavement structure 270 is constructed on the top of the pile body 230 to complete the embankment construction. On the one hand, construction can be carried out directly on the original embankment 100 without excavating the original road and removing the upper structure and filling of the original embankment 100, thereby avoiding the waste of resources and the increase in time cost caused by large-scale demolition and reconstruction. On the other hand, the coordination of various structures makes the widened and heightened embankment form a stable mechanical system, which can effectively resist the interference of external factors such as long-term vehicle loads and natural weathering erosion, thereby reducing maintenance costs and ensuring the stable and efficient operation of the embankment for a long time.

[0047] In S2, after each layer of soil is filled, the soil is compacted to ensure the density of the soil.

[0048] In S3, constructing the pile cap 231 on the pile body 230 includes: obtaining a preset installation position of the template, installing the template according to the preset installation position, making steel bars and embedded parts, and installing the steel bars and embedded parts on the template, and pouring concrete of the pile cap 231 in the template.

[0049] In S5, the filler is crushed stone or medium-coarse sand.

[0050] It should be noted that gravel and medium-coarse sand have larger particles and harder texture. Compared with ordinary soil, they have better water permeability and can quickly drain rainwater or groundwater, prevent water accumulation from eroding and damaging the embankment structure, and ensure that the inside of the embankment is dry and stable. On the other hand, gravel and medium-coarse sand are not easy to deform when under pressure, and can provide more stable support for the upper structure, while soil is easily compressed, which may cause problems such as road depression. At the same time, geosynthetics work closely with gravel and medium-coarse sand to form a more effective reinforcement system, which can cooperate with piles to enhance the overall strength of the embankment. The combination of soil and reinforcement materials is poor, and it is difficult to give full play to the reinforcement effect to improve the stability of the embankment.

[0051] In S5, the geosynthetics are fixed to the pile cap 231 and the lattice beam using connectors.

[0052] In S5, the geosynthetics are laid in multiple layers, and fillers are laid between two adjacent geosynthetics. After the fillers are laid flat, a level detection is performed to prevent uneven filling thickness. Further, after the level detection of the fillers on the geosynthetics is completed, a roller is used for static compaction.

[0053] In S6, the construction of cement soil 260 includes: cleaning the base layer, removing debris on the base layer to make the base layer flat, installing side molds and middle partition molds, evenly spreading the cement soil 260 in the molds, vibrating the spread cement soil 260 to ensure that the cement soil 260 is dense, and removing the molds after the cement soil 260 reaches a preset strength.

[0054] In S6, the pavement structure 270 construction includes: cleaning the dirt, dust and debris on the cement soil 260 to ensure that the cement soil 260 layer is flat and clean, evenly laying the pavement structure 270 material on the cement soil 260, and compacting and trimming the pavement structure 270 material to ensure the density and stability of the pavement structure 270 material.

[0055] It should be noted that, when the geological conditions are relatively bad, more piles are often needed to be driven in, and more piles will destroy the original equilibrium state of the foundation and produce a greater soil squeezing effect. The squeezed soil will cause the side piles to have a larger lateral displacement, thereby reducing the bearing capacity of the pile foundation. This method sets a retaining wall 220 on both sides of the original embankment 100. When the geological conditions are poor, the retaining wall 220 is like a solid boundary, which limits the movement of the soil to both sides. Since the retaining wall 220 shares the lateral pressure, the lateral soil pressure on the pile body 230 is reduced, thereby reducing the possibility of the pile body moving sideways due to the soil squeezing effect. At the same time, if Figure 7The conventional widened and raised embankment foot 300 shown in the figure requires slopes on both sides to ensure its stability, and retaining walls 220 are set on both sides of the original embankment 100. In addition to reducing the impact of the soil squeezing effect on the project, it can also reduce the land area of ​​the embankment, thereby improving land utilization.

[0056] In addition, the integrity of the pile-supported reinforced embankment is poor. Specifically, the pile-supported reinforced embankment is composed of independent piles. Under unstable geological conditions, the stress states of different piles may be different, which will lead to different settlements of different piles, resulting in large differential settlements, affecting the performance of the embankment. This method uses a reinforced lattice beam 240 structure between the pile caps 231 of each pile, and connects the overall structure formed by the pile caps 231 and the reinforced lattice beam 240 to the retaining wall 220, so that the embankment has good integrity, thereby effectively reducing the uneven settlement of the embankment and ensuring the stability of the embankment after loading.

[0057] like Figure 1 and Figure 2 As shown, the novel method for constructing a widened and elevated pile-supported reinforced embankment is specifically described below with a specific implementation.

[0058] like Figure 2 As shown, along the extension direction of the road, a plurality of retaining wall support piles 210 are driven into predetermined positions of the foundations on both sides of the original embankment 100. Figure 3 As shown, after the retaining wall support piles 210 are driven, the reinforced concrete retaining wall 220 is gradually constructed on the retaining wall support piles 210 .

[0059] After the construction of the reinforced concrete retaining wall 220 is completed, the original embankment 100 is directly filled in layers. After each layer of soil is filled, the soil layer needs to be compacted to ensure the density of the soil. The filling and compaction work is repeated until the filling surface elevation of the filled coating reaches the preset pile body 230 construction surface elevation.

[0060] like Figure 4 As shown, after the fill is compacted, pile driving is performed on the fill surface. After all the pile bodies 230 are driven into the corresponding positions, the pile caps 231 are sequentially constructed at the tops of the pile bodies 230. Specifically, a template is first installed at a preset position on the pile top. After the template is installed, steel bars and embedded parts are made and installed in the template to ensure that the steel bars and embedded parts meet the design requirements and standards. After the installation is completed, the concrete pouring of the pile cap 231 is performed in the template.

[0061] like Figure 5As shown, after the construction of the pile cap 231 is completed, the reinforced lattice beam 240 is cast in situ. The reinforced lattice beam 240 can improve the mechanical properties of the embankment structure. At the same time, it is connected to the pile cap 231. When a certain independent pile body 230 is subjected to a large horizontal load, the lattice beam structure can share the load with other pile bodies 230, and the horizontal load is borne by the entire structure together, thereby improving the integrity of the embankment and avoiding the problem of a certain pile body 230 having a large lateral displacement due to the soil squeezing effect.

[0062] After the construction of the reinforced lattice beam 240 is completed, first lay the crushed stone material or medium-coarse sand in the part between the piles to the top of the pile cap 231, and then lay the geosynthetics. Specifically, the geosynthetics should be laid on the top surface of the pile cap 231 and the lattice beam, and covered on the material between the piles to form a reinforced cushion layer. Among them, the bottom surface of the geosynthetics should be flat and dense when laying, and should be laid flat and straightened without curling or kinking. U-shaped nails should be used to fix it on the pile cap 231 or the lattice beam every 2m to 3m. Furthermore, when multiple layers of geosynthetics are laid, after the first layer of geosynthetics is laid, start filling the second layer of crushed stone material or medium-coarse sand of a certain thickness. After the second layer of medium-coarse sand is leveled, horizontal measurement should be carried out to prevent uneven filling thickness. Finally, after the leveling is correct, use a vibrating roller to statically press twice.

[0063] It should be noted that geosynthetics will generate strain when the internal filling soil settles, which can transfer the soil load between piles to the pile cap 231 and the lattice beam, reducing the load borne by the soil between piles. The reinforced lattice beam 240 structure can share the load on the pile cap 231 and reduce the settlement of the pile body 230. Therefore, the structure combining geosynthetics and reinforced lattice beams 240 can improve the performance of load transfer after the embankment is filled and reduce the uneven settlement of the embankment.

[0064] like Figure 6As shown, after the geosynthetics are laid, the pile top is backfilled in layers, and after each layer of soil is filled, the soil is compacted to ensure the density of the backfill 250. After the backfill 250 is completed, the base is cleaned to remove debris and uneven parts, and then the side formwork and the middle partition formwork are installed according to the design requirements, and then the cement soil 260 is evenly spread in the formwork using a paver, and the spread cement soil 260 is vibrated using a vibration device to eliminate bubbles in the cement soil 260 and ensure the density of the cement soil 260. When the cement soil 260 reaches a certain strength, the formwork is removed and the pavement structure 270 is constructed. In this specific embodiment, asphalt is used as the pavement structure 270. First, the soil, dust and debris on the cement soil 260 layer need to be cleaned to ensure that the cement soil 260 layer is flat and clean. Then, the asphalt concrete is evenly laid on the pavement using a paver, and compacted and trimmed. A suitable roller is selected for compaction to ensure the density and stability of the asphalt mixture, and the joints generated during the construction process are properly handled to ensure the flatness and beauty of the pavement. Figure 1 and Figure 7 As shown, the construction of the new embankment 200 has been completed.

[0065] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A novel method for widening and heightening pile-supported reinforced embankment construction, characterized in that: include: S1: driving a plurality of retaining wall support piles (210) into the foundations on both sides of the original embankment (100) along the extension direction of the road, and carrying out retaining wall (220) construction work on both sides of the original embankment (100) according to the positions of the plurality of retaining wall support piles (210) to form a retaining structure of the original embankment (100); S2: Carry out layered filling operation, and continue filling until the filling surface elevation of the filling layer reaches the preset pile body (230) construction surface elevation; S3: Starting the piling operation on the fill surface, and after all the pile bodies (230) are driven into the preset positions, carrying out the construction of the pile cap (231) at the top of the pile body (230); S4: constructing a reinforced lattice beam (240), and connecting the reinforced lattice beam (240) to the pile cap (231); S5: Performing the laying work between the piles, ensuring that the filler is evenly laid to be flush with the top of the pile cap (231), laying the geosynthetics evenly on the pile cap (231) and the top of the reinforced lattice beam (240), and covering the filler between the piles with the geosynthetics to form a reinforced cushion layer; S6: backfill soil (250), cement soil (260) and pavement structure (270) are sequentially constructed on top of the plurality of pile bodies (230).

2. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S2, after each layer of soil is filled, the soil is compacted to ensure the density of the soil.

3. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S3, constructing a pile cap (231) on the pile body (230) includes: Get the template preset installation location; Install the template according to the preset installation position; Make steel bars and embedded parts, and install them on the formwork; The concrete pouring work of the pile cap (231) is carried out in the formwork.

4. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S5, the filler is crushed stone or medium-coarse sand.

5. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S5, the geosynthetics are fixed to the pile cap (231) and the lattice beam using connectors.

6. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S5, the geosynthetics are laid in multiple layers, and fillers are laid between two adjacent layers of geosynthetics.

7. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 6 is characterized in that: The fill material laid between two adjacent layers of geosynthetics shall be checked for levelness after being laid flat to prevent uneven filling thickness.

8. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 7 is characterized in that: After completing the level test of the filler on the geosynthetics, a roller is used for static compaction.

9. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S6, cement soil (260) construction includes: Clean the base layer and remove the debris on the base layer to make the base layer flat; Install the side formwork and the middle partition formwork, and evenly spread the cement soil (260) inside the formwork; The paved cement soil (260) is vibrated to ensure that the cement soil (260) is compacted; After the cement soil (260) reaches a preset strength, the formwork is removed.

10. The novel widening and heightening pile-supported reinforced embankment construction method according to claim 1 is characterized in that: In S6, the construction of the pavement structure (270) includes: Cleaning the soil, dust and debris on the cement soil (260) to ensure that the cement soil (260) layer is flat and clean; Evenly laying the pavement structure (270) material on the cement soil (260); The pavement structure (270) material is compacted and trimmed to ensure the density and stability of the pavement structure (270) material.

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