Composite foundation pile and construction method thereof
Patent Information
- Application Number
- CN202611276651.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-21
- Publication Date
- 2026-10-09
AI Technical Summary
塑料排水板堆载预压法的造价最低，但工期较长，且会造成周边一定范围的沉降；水泥土搅拌桩复合地基的造价低，但其施工受人为因素影响大，且在有机质含量较高时，水泥土加固效果不佳；碎石桩复合地基采用的是散体材料桩，加固软土时桩身承载力低；CFG桩复合地基和预应力管桩复合地基中采用的桩均为刚性桩，造价高且沉降协调性较差，容易造成与相邻路段的不均匀沉降
[0007]本申请提供的一种复合地基桩的有益效果是：第一，本申请采用模块化的结构设计，将桩体拆分为桩尖、第一预制桩和拼接桩体，再将拼接桩体拆分为多个预制桩段，通过在工厂提前预制桩尖、第一预制桩和预制桩段，然后将桩尖、第一预制桩和预制桩段运输至现场进行拼接，多个预制桩段拼接后并通过第一限位件和第二限位件进行限位，能够根据现场要求进行灵活施工，不仅提高了桩体在现场施工中的稳定性、灵活性和施工质量，还有效压缩了工期，提高了现场施工效率。
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Abstract
Description
Technical Field
[0001] This application relates to the field of civil engineering technology, and in particular to a composite foundation pile and a construction method for the composite foundation pile. Background Technology
[0002] Common methods for treating soft soil foundations include surcharge preloading with plastic drainage boards, cement-soil mixing pile composite foundations, crushed stone pile composite foundations, CFG pile composite foundations, and prestressed pipe pile composite foundations. Surcharge preloading with plastic drainage boards has the lowest cost, but the construction period is long and it can cause settlement in the surrounding area. Cement-soil mixing pile composite foundations are inexpensive, but their construction is greatly affected by human factors, and the reinforcement effect is poor when the organic matter content is high. Crushed stone pile composite foundations use loose material piles, which have low pile bearing capacity when reinforcing soft soil. CFG pile composite foundations and prestressed pipe pile composite foundations both use rigid piles, which are expensive and have poor settlement coordination, easily causing uneven settlement with adjacent road sections.
[0003] In existing technologies, cement-soil mixing pile composite foundations are commonly used for construction. Cement-soil mixing pile composite foundations use in-situ mixing, which has little impact on the environment and no soil displacement effect. However, in-situ mixing is prone to insufficient mixing, poor uniformity of the pile body, large strength dispersion, insufficient cement usage, and difficulty in comprehensively testing and evaluating the quality of the pile body, making it difficult to control the construction quality. Summary of the Invention
[0004] This application aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the purpose of this application is to provide a composite foundation pile that not only improves the stability, flexibility, and construction quality of the pile during on-site construction, but also increases on-site construction efficiency and enhances the bearing capacity of the soil surrounding the pile.
[0005] This application also provides a construction method for the aforementioned composite foundation piles.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: The pile body includes a pile tip, a first precast pile, and a spliced pile body arranged sequentially along the length of the pile body. The spliced pile body includes multiple precast pile segments, and adjacent precast pile segments can be spliced together. The drainage board is arranged on the outside of the pile body along the length of the pile body. The limiting component assembly includes a first limiting component and a second limiting component. The first limiting component is used to connect adjacent precast pile segments. The second limiting component is disposed on the outside of the spliced pile body along the length direction of the pile body and limits the multiple precast pile segments. A stress diffusion layer is provided at the top of the pile body along the length direction of the pile body, and the drainage board abuts against the stress diffusion layer. The stress diffusion layer is used to disperse stress and drain water.
[0007] The beneficial effects of the composite foundation pile provided in this application are as follows: First, this application adopts a modular structural design, which divides the pile body into a pile tip, a first precast pile, and a spliced pile body. The spliced pile body is then divided into multiple precast pile segments. By prefabricating the pile tip, the first precast pile, and the precast pile segments in the factory, and then transporting the pile tip, the first precast pile, and the precast pile segments to the site for splicing, the multiple precast pile segments are spliced and then limited by the first and second limiting components. This allows for flexible construction according to site requirements, which not only improves the stability, flexibility, and construction quality of the pile body during on-site construction, but also effectively shortens the construction period and improves on-site construction efficiency.
[0008] Secondly, this application provides a drainage board on the outer side of the pile along its length. The drainage board can accelerate the drainage and consolidation of the soil around the pile, effectively ensuring that the pore water pressure during construction can be eliminated in time after the pile is formed, reducing the soil squeezing effect during construction, improving the bearing capacity of the soil around the pile, and thus enhancing the bearing capacity of the composite foundation pile.
[0009] As described above, in a composite foundation pile, the precast pile segment is provided with a first installation groove and a second installation groove on the outer side along the length direction. The first installation groove and the second installation groove are spaced apart along the circumference of the precast pile segment, and the drainage board and the second limiting member are respectively locked in the first installation groove and the second installation groove.
[0010] As described above, in a composite foundation pile, the first mounting groove is provided with limiting member mounting holes on both sides along the length direction, and the two sides of the first limiting member are respectively connected to the limiting member mounting holes of two adjacent precast pile segments.
[0011] As described above, in a composite foundation pile, the first precast pile is provided with a third installation groove and a fourth installation groove along its length, the third installation groove and the fourth installation groove being connected to the first installation groove and the second installation groove, respectively; one end of the drainage board is inserted into the third installation groove, and the other end is along the first installation groove and abuts against the stress diffusion layer; one end of the second limiting member is inserted into the fourth installation groove, and the other end is along the second installation groove and abuts against the stress diffusion layer.
[0012] As described above, in a composite foundation pile, the pile tip is provided with a first splicing position on the side near the first precast pile; the first precast pile is provided with a first splicing end on the side facing the pile tip, and a second splicing position on the other side; the first precast pile is connected to the first splicing position through the first splicing end; the precast pile segment is provided with a second splicing end on the side facing the first precast pile, and a third splicing position on the other side; the precast pile segment is connected to the second splicing position through the second splicing end, and two adjacent precast pile segments can be spliced together through the third splicing position and the second splicing end.
[0013] As described above, in a composite foundation pile, the limiting component group further includes a binding component, which is arranged in a ring at the connection between the two precast pile segments to limit the first limiting component, the second limiting component, and the drainage board.
[0014] In the composite foundation pile described above, the stress diffusion layer is at least one of a cover plate, a geogrid, and a geocell, and a permeable cushion layer is provided on the side of the stress diffusion layer away from the spliced pile body.
[0015] In the composite foundation pile described above, the length of the precast pile segment ranges from 0.9m to 2.2m.
[0016] As described above, in a composite foundation pile, the precast pile segment is made of lightweight material with a density of 5kN / m3 to 10kN / m3.
[0017] This application also provides a construction method for composite foundation piles as described above, comprising the following steps: Level the site, measure and lay out the data, prefabricate the pile tip, the first prefabricated pile and the prefabricated pile segment, prepare the drainage board, and process the first limiting member and the second limiting member; Spiral drilling is performed on the road surface to a predetermined depth, and the hard shell layer is drilled through to form an installation hole; After the installation hole is drilled, align the center of the pile body and the installation hole, connect the pile tip to one side of the hollow sleeve, then press the hollow sleeve into the soft soil layer through the pile tip, and then press the hollow sleeve into the installation hole through the pile tip. The second precast pile is lowered through the hollow sleeve, the second limiting member is lifted, and the second limiting member is connected to the first precast pile; The first precast pile segment is connected to the second first precast pile and then lowered; next, the second precast pile segment is connected to the first precast pile segment, and then the first and second limiting members are used to lock the precast pile segment for limiting, and the drainage board is installed simultaneously, and then the second precast pile segment is lowered; then, the splicing of the precast pile segments continues to be repeated until the splicing of all the precast pile segments is completed; Remove the hollow sleeve and compact the soil around the pile to complete the lowering of the pile. After the pile body construction is completed, the stress diffusion layer is constructed to form a composite foundation pile with drainage function.
[0018] The beneficial effects of the construction method for composite foundation piles provided in this application are as follows: First, through preliminary preparations such as site leveling, surveying and setting out, and prefabrication of modular components, the application combines spiral drilling to form installation holes and drill through the hard shell layer. Then, the pile tip is connected to a hollow sleeve to press the hollow sleeve into the installation hole, thereby providing protection and precise guidance for the lowering of the pile through the hollow sleeve.
[0019] Secondly, this application connects the pile tip to the hollow sleeve, presses the hollow sleeve into the soft soil layer through the pile tip, and then presses the hollow sleeve into the installation hole through the pile tip; the first precast pile is lowered, the first precast pile segment is connected to the first precast pile and lowered, and then multiple precast pile segments are connected in sequence and limited by the first and second limiting members; at the same time, drainage boards are installed simultaneously during the splicing of precast pile segments, and finally the sleeve is removed and the soil around the pile body is compacted to complete the lowering of the pile body. This not only overcomes the defects of the long construction period of the drainage board surcharge preloading method and shortens the construction cycle, but also adopts precast modular components and mechanical pressing method in the entire construction process, without the need for in-situ mixing, avoiding the uncontrollable quality problem caused by insufficient cement or insufficient mixing of cement-soil mixing piles, thus improving the construction quality of the pile body.
[0020] Third, the segmented splicing construction of the spliced piles is flexible and convenient, and the pile length can be adjusted according to the actual foundation depth to adapt to different working conditions, effectively improving the flexibility of on-site construction. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this embodiment without the second limiting member and drainage plate installed; Figure 2 For the corresponding Figure 1 Exploded view of the structure after removing some precast pile segments; Figure 3 This is a schematic diagram of the structure in an embodiment of this application, showing that the drainage board can be connected to the upper surface of the stress diffusion layer; Figure 4This is a schematic diagram of the structure after the composite foundation piles are laid according to an embodiment of this application; Figure 5 For the corresponding Figure 4 Enlarged view of the A-section structure; Figure 6 This is a schematic diagram of the structure after the pile body has been lowered and the stress diffusion layer installed, according to an embodiment of this application. Figure 7 For the corresponding Figure 6 Enlarged view of the structure of section B; Figure 8 This is a schematic diagram of the structure of the pile body after it has been lowered and the stress diffusion layers in different directions have been installed, according to an embodiment of this application. Figure 9 For the corresponding Figure 8 Enlarged view of the C-section structure; Figure 10 This is a schematic diagram of the structure from the construction of composite foundation piles to the laying of permeable cushion layer in an embodiment of this application.
[0022] Reference numerals: 100-Pile body, 110-Pile tip, 111-First splicing position, 120-First precast pile, 121-Third installation slot, 122-Fourth installation slot, 123-First splicing end, 124-Second splicing position, 130-Spliced pile body, 131-Precast pile segment, 1311-First installation slot, 1312-Second installation slot, 1313-Second splicing end, 1314-Third splicing position, 140-Stress diffusion layer; 200-Drainage board; 310-First limiting component, 320-Second limiting component; 400-Hard shell layer; 500-Soft soil layer; 600-Bearing layer; 700-Permeable cushion layer; 800-High-strength geogrid. Detailed Implementation
[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0024] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0025] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.
[0026] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.
[0027] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0028] like Figures 1-10 As shown in the embodiment of this application, a composite foundation pile includes: The pile body 100 includes a pile tip 110, a first precast pile 120 and a spliced pile body 130 arranged sequentially along the length of the pile body 100. The spliced pile body 130 includes multiple precast pile segments 131, and two adjacent precast pile segments 131 can be spliced together. Drainage board 200 is installed on the outside of pile body 100 along the length of pile body 100. It is used to eliminate pore water pressure during construction, accelerate drainage and consolidation of soil around pile, improve the bearing capacity of soil around pile, and promote consolidation and settlement of soil around pile, thereby effectively improving the bearing capacity and stability of composite foundation pile.
[0029] The limiting component assembly includes a first limiting component 310 and a second limiting component 320. The first limiting component 310 is used to connect adjacent precast pile segments 131. The second limiting component 320 is arranged on the outside of the spliced pile body 130 along the length direction of the pile body 100 and limits the multiple precast pile segments 131. The stress diffusion layer 140 is provided at the top of the pile body 100 along the length direction of the pile body 100, and the drainage board 200 abuts against the stress diffusion layer 140. The stress diffusion layer 140 is used to disperse stress and drain water.
[0030] Specifically, the drainage board 200 is a continuous plate. By setting the drainage board 200 along the length of the pile body 100 on the outside of the pile body 100 and inserting it into the stress diffusion layer 140, water can be discharged through the stress diffusion layer 140.
[0031] In some other embodiments, such as Figure 3As shown, the drainage board 200 can cover the upper surface of the stress diffusion layer 140 to directly discharge water and accelerate drainage efficiency.
[0032] Specifically, the beneficial effects of the composite foundation pile provided in this application are as follows: First, this application adopts a modular structural design, dividing the pile body 100 into a pile tip 110, a first precast pile 120, and a spliced pile body 130. The spliced pile body 130 is then divided into multiple precast pile segments 131. By prefabricating the pile tip 110, the first precast pile 120, and the precast pile segments 131 in the factory, and then transporting the pile tip 110, the first precast pile 120, and the precast pile segments 131 to the site for splicing, the multiple precast pile segments 131 are spliced and then limited by the first limiting member 310 and the second limiting member 320, which allows for flexible construction according to site requirements. This not only improves the stability, flexibility, and construction quality of the pile body 100 during on-site construction, but also effectively shortens the construction period and improves on-site construction efficiency.
[0033] Secondly, this application provides a drainage board 200 on the outer side of the pile body 100 along its length. The drainage board can accelerate the drainage and consolidation of the soil around the pile, effectively ensuring that the pore water pressure during the construction process can be eliminated in time after the pile body 100 is completed, reducing the soil squeezing effect during the construction process, improving the bearing capacity of the soil around the pile, and thus enhancing the bearing capacity of the composite foundation pile.
[0034] In some embodiments, such as Figures 1-2 As shown, the precast pile segment 131 is provided with a first mounting groove 1311 and a second mounting groove 1312 on the outer side along the length direction. The first mounting groove 1311 and the second mounting groove 1312 are arranged at intervals along the circumference of the precast pile segment 131. The drainage board 200 and the second limiting member 320 are respectively locked in the first mounting groove 1311 and the second mounting groove 1312.
[0035] Specifically, the composite foundation pile in this embodiment is a cylindrical pile design. There are two first installation slots 1311 and two second installation slots 1312. The two first installation slots 1311 and the two second installation slots 1312 are designed at 90° intervals along the circumference of the precast pile segment 131. That is, the line connecting the two first installation slots 1311 through the center line of the precast pile segment 131 is perpendicular to the line connecting the two second installation slots 1312 through the center line of the precast pile segment 131. The design of the double first installation slots 1311 allows double drainage boards 200 to be installed on both sides of the precast pile segment 131 to form a double-channel drainage structure, thereby accelerating the dissipation of pore water pressure in the soil around the pile and improving the consolidation rate of the soil around the pile. The design of the double second mounting slots 1312 allows double second limiting members 320 to be installed on both sides of the composite foundation pile to form double-sided limiting for multiple precast pile segments 131, preventing the precast pile segments 131 from deflecting during the splicing process, thereby improving the bending stiffness and stability of the spliced pile body 130.
[0036] Specifically, in this embodiment, the first mounting groove 1311 is a rectangular groove, so that after the drainage board 200 is inserted into the rectangular groove, the drainage board 200 cannot rotate or flip around its own length direction because the two sides of the drainage board 200 are constrained by the two vertical groove walls of the rectangular groove. This ensures that the drainage board 200 always fits the soil with its wide surface on the outside of the spliced pile body 130, thus ensuring the stability of the drainage channel direction.
[0037] Specifically, the second limiting member 320 is a steel bar with a bent portion on the side facing the pile tip 110. The bent portion can be embedded in the precast pile fastening hole reserved in the first precast pile 120, so that the second limiting member 320 can serve as a limiting member during the splicing process of the precast pile segment 131 to prevent deformation of the spliced precast pile segment 131, and also as an installation hoisting tool during construction, effectively improving the flexibility of the second limiting member 320. At the same time, the second installation groove 1312 is a semi-circular groove, so that the arc-shaped groove surface of the semi-circular groove can form a large area of arc-shaped surface contact with the outer wall of the steel bar, effectively increasing the contact area, thereby making the second limiting member 320 more evenly stressed in the groove, less likely to damage the precast pile segment 131, and effectively improving the safety during construction.
[0038] In some embodiments, such as Figures 1-2 As shown, the first mounting groove 1311 has mounting holes for limiting members on both sides along its length, and the two sides of the first limiting member 310 are respectively connected to the mounting holes for limiting members of two adjacent precast pile segments 131.
[0039] Specifically, the first limiting member 310 has a U-shaped design. The bent portions on both sides of the first limiting member 310 are respectively inserted into the limiting member installation holes of two adjacent precast pile segments 131, which can limit the deformation of the spliced pile body 130 along the length direction and effectively improve the stability of the splicing of the precast pile segments 131. At the same time, through the embedded design of the first limiting member 310, it does not affect the drainage board 200 being inserted into the first installation groove 1311, which effectively improves the structural compactness of the composite foundation pile.
[0040] Specifically, the first limiting member 310 is made of high-density polyethylene, which can effectively improve the corrosion resistance of the first limiting member 310 and extend the service life of the first limiting member 310.
[0041] In some embodiments, such as Figures 1-2As shown, the first precast pile 120 is provided with a third mounting groove 121 and a fourth mounting groove 122 along its length. The third mounting groove 121 is connected to the first mounting groove 1311, and the fourth mounting groove 122 is connected to the second mounting groove 1312. One end of the drainage board 200 is inserted into the third mounting groove 121, and the other end is along the first mounting groove 1311 and abuts against the stress diffusion layer 140. One end of the second limiting member 320 is inserted into the fourth mounting groove 122, and the other end is along the second mounting groove 1312 and abuts against the stress diffusion layer 140, so as to ensure that multiple precast pile segments 131 can be smoothly lowered through the limiting effect of the second limiting member 320, thereby improving the smoothness of the construction process.
[0042] Specifically, the fourth mounting groove 122 is also a semi-circular groove, and the precast pile fastening hole is located in the fourth mounting groove 122 to ensure that the outer wall of the second limiting member 320 along the length direction can completely abut against the inner wall of the fourth mounting groove 122 and the second mounting groove 1312, thereby improving the consistency of the limiting function of the second limiting member 320.
[0043] In some embodiments, such as Figures 1-2 As shown, the pile tip 110 has a first splicing position 111 on the side near the first precast pile 120; the first precast pile 120 has a first splicing end 123 on the side facing the pile tip 110, and a second splicing position 124 on the other side; the first precast pile 120 is connected to the first splicing position 111 through the first splicing end 123; the precast pile segment 131 has a second splicing end 1313 on the side facing the first precast pile 120, and a third splicing position 1314 on the other side; the precast pile segment 131 is connected to the second splicing position 124 through the second splicing end 1313, and two adjacent precast pile segments 131 can be spliced through the third splicing position 1314 and the second splicing end 1313.
[0044] Specifically, the first splicing position 111, the second splicing position 124, and the third splicing position 1314 are pre-reserved connecting circular holes with a certain depth. The first splicing end 123 and the second splicing end 1313 are cylindrical protrusions. This ensures that after the cylindrical protrusions are embedded in the connecting circular holes, they can prevent the pile tip 110, the first precast pile 120, and the precast pile segment 131 from deforming in the direction perpendicular to the length of the pile body 100, thereby improving the stability of the pile body 100 splicing. At the same time, the design of the connecting circular holes and the cylindrical protrusions ensures that the mating surfaces of the connecting circular holes and the cylindrical protrusions are complete cylindrical surfaces. When the pile body is subjected to shear force or seismic action perpendicular to the pile body 100, compared with square or unilateral limiting structures, the mating surfaces of the connecting circular holes and the cylindrical protrusions can provide 360° full-circumferential shear bearing capacity. Regardless of the direction of the shear force, it can be effectively resisted, effectively improving the reliability of the pile body 100 during use.
[0045] In some embodiments, the limiting member assembly further includes a binding member, which is arranged in a loop at the connection of the two precast pile segments 131 to limit the first limiting member 310, the second limiting member 320 and the drainage board 200.
[0046] Specifically, the binding component is made of flexible material. After two adjacent precast pile segments 131 are spliced together, the binding component is used to bind the precast pile segment 131 around its circumference at the connection point of the two precast pile segments 131 to ensure that the first limiting component 310, the second limiting component 320 and the drainage board 200 can be firmly embedded in the precast pile segment 131, thereby improving the stability of the splicing of the precast pile segment 131.
[0047] In some embodiments, such as Figures 1-2 , Figure 5 As shown, the stress diffusion layer 140 is at least one of a cover plate, a geogrid, and a geocell, and a permeable cushion layer 700 is provided on the side of the stress diffusion layer 140 away from the spliced pile body 130 to enhance the support stability of the stress diffusion layer 140; at the same time, by embedding the permeable cushion layer 700 into the stress diffusion layer 140, the drainage efficiency of the composite foundation pile is effectively improved.
[0048] Specifically, the stress diffusion layer 140 should be filled with permeable materials such as crushed stone, medium and coarse sand, and stone chips to enhance the permeability of the stress diffusion layer 140 and facilitate the timely drainage of water from the drainage board 200.
[0049] Specifically, in this embodiment, the stress diffusion layer 140 is a cover plate made of reinforced concrete and filled with permeable materials such as crushed stone, medium and coarse sand, manufactured sand, and stone chips to enhance permeability.
[0050] Specifically, the permeable cushion layer 700 is laid with permeable materials such as crushed stone, medium and coarse sand, manufactured sand, and stone chips, providing an efficient drainage outlet for the stress diffusion layer 140, avoiding the accumulation of water on the ground surface to form a "water cushion effect" that affects drainage efficiency, and improving the reliability of the composite foundation piles.
[0051] In some embodiments, such as Figures 1-2 , Figure 5 As shown, the length of the precast pile segment 131 ranges from 0.9m to 2.2m.
[0052] Specifically, in this embodiment, the length of the precast pile segment 131 is preferably between 1.2m and 1.8m. Controlling the length of the precast pile segment 131 within the range of 0.9m to 2.2m ensures that each individual precast pile segment 131 has sufficient structural strength while also making its weight moderate for easy manual handling and hoisting on the construction site. Simultaneously, the length range of 1.2m to 1.8m allows for length adjustment of the spliced pile body 130 with a smaller length modulus, enabling precise matching of the designed length of the spliced pile body 130 under different geological conditions, thus avoiding material waste or insufficient length problems caused by a fixed pile body 100 length.
[0053] In some embodiments, such as Figures 1-2 , Figure 5 The precast pile segment 131 shown uses a unit weight of 5kN / m. 3 ~10kN / m 3 It is made of lightweight materials.
[0054] Specifically, the lightweight material is any one of aerated lightweight soil, fluidized solidified soil, lightweight concrete, aerated concrete, lightweight aggregate concrete, or fiber-reinforced lightweight composite material, which gives the precast pile segment 131 a low self-weight. This facilitates handling, hoisting, and assembly on the construction site, reducing the requirements for construction machinery and equipment. Furthermore, the lightweight precast pile segment 131 reduces the additional stress exerted by the pile body 100 on the surrounding soil in composite foundation piles, which helps control foundation settlement and improves the reinforcement effect of the composite foundation piles. In this embodiment, the preferred density of the precast pile segment 131 is 6 kN / m³. 3 ~7kN / m 3 At 6kN / m 3 ~7kN / m 3 Under heavy loads, the weight of a single precast pile segment 131 (0.9m~2.2m) is only 1 / 4 of that of a reinforced concrete pile segment of the same volume, which makes it easy to handle by hand without relying on large lifting equipment. This effectively reduces the cost of construction machinery and the limitations of working conditions, thereby reducing construction costs and improving the flexibility of use of precast pile segment 131.
[0055] Specifically, in this embodiment, the compressive strength of the lightweight material is greater than 1.5 MPa. At the same time, this embodiment uses the static pressure method for construction. The compressive strength of the lightweight material is greater than 1.5 MPa, so that when the top of the pile 100 is subjected to repeated impact force, the impact force propagates downward along the length of the pile 100 in the form of stress wave, avoiding stress concentration and hole wall damage.
[0056] Specifically, the first limiting member 310 is made of high-density polyethylene, which is closer to the elastic modulus of lightweight materials, so as to achieve deformation coordination between the first limiting member 310 and the precast pile segment 131, effectively reducing the risk of hole wall damage of the limiting member installation hole.
[0057] Specifically, the pile tip 110 and the first precast pile 120 are made of reinforced concrete to ensure that the pile tip 110 has high strength during the sinking process; at the same time, the first precast pile 120 is used to connect the second limiting member 320 and mainly bears the tensile force of the second limiting member 320. The first precast pile 120 is made of reinforced concrete, which can avoid the precast pile segment 131 from bearing high local stress.
[0058] Specifically, the water flow rate of the drainage board 200 along its length is greater than 25cm. 3 / s, which can ensure that most of the soil around the piles consolidates and settles within a short period of time (usually several weeks to several months), thus rapidly improving the bearing capacity of the foundation.
[0059] Specifically, after the pile body 100 is lowered, the exposed section of the drainage board 200 extending out of the foundation surface is not less than 0.5m in length, so that the exposed section of the drainage board 200 can be used to connect with the permeable cushion layer or the drainage system, thereby guiding the pore water in the soil around the pile to the outside of the foundation.
[0060] like Figures 1-10 This application also provides a construction method for the above-mentioned composite foundation piles, comprising the following steps: S100. Level the site, measure and lay out the data, prefabricate the pile tip 110, the first prefabricated pile 120 and the prefabricated pile segment 131, prepare the drainage board 200, and process the first limiting component 310 and the second limiting component 320.
[0061] S200. Perform spiral drilling on the road surface according to the preset depth, and drill through the hard shell layer 400 to form an installation hole.
[0062] Specifically, a large-scale spiral static pressure pile driver is used for construction. The drilling depth is preset based on the measured layout data. When the hard shell layer is thick, spiral drilling is performed on the road surface. The drilling depth should penetrate the hard shell layer, and the depth of the installation hole is generally no more than 5m. This ensures that the pile tip 110 penetrates the hard shell layer while avoiding unnecessary deep drilling, making it economical and reasonable. When the hard shell layer is thin, the depth of the installation hole formed by the spiral drilling should not be less than 2m, providing sufficient "embedding length" for the pile body 100, allowing it to be anchored in a relatively stable soil layer.
[0063] S300. After the installation hole is formed, a construction support is erected around the installation hole. The center of the pile body 100 and the installation hole are aligned. The pile tip 110 is connected to one side of the hollow sleeve. Then, the hollow sleeve is pressed into the soft soil layer 500 through the pile tip 110. Finally, the hollow sleeve is completely pressed into the installation hole through the pile tip 110.
[0064] Specifically, after the installation hole is formed, a small static pressure pile driver is used for construction. The center of the pile body 100 and the installation hole are aligned. Then, the pile tip 110 is connected to one side of the hollow sleeve by a pre-set connecting thread on the inner side of the hollow sleeve and a pre-set installation thread on the outer side of the pile tip 110. The hollow sleeve is then pressed into the soft soil layer 500 by the gravity of the pile tip 110. Finally, the hollow sleeve is completely pressed into the installation hole by the pile tip 110 through static pressure. This allows the hollow sleeve to pass through the hard shell layer 400 and the soft soil layer 500 in sequence to reach the bearing layer 600. The hollow sleeve prevents the inner wall of the installation hole from collapsing, which would affect the subsequent lowering of the precast pile segment 131 and improve the smoothness of the construction process.
[0065] S400, the first precast pile 120 is lowered through the hollow sleeve, the second limiting member 320 is lifted, and the second limiting member 320 is connected to the first precast pile 120.
[0066] Specifically, the first precast pile 120 is lowered through a hollow sleeve, the two second limiting members 320 are lifted, and the bent part of the second limiting member 320 is embedded into the precast pile fastening hole reserved in the first precast pile 120 to fix the second limiting member 320, which facilitates subsequent splicing.
[0067] S500: After connecting the first precast pile segment 131 to the first precast pile 120, lower it down; then, connect the second precast pile segment 131 to the first precast pile segment 131, and then use the first limiting member 310 and the second limiting member 320 to lock the precast pile segment 131 for limiting, and simultaneously install the drainage board 200, and then lower the precast pile segment 131 down; continue to repeatedly splice the precast pile segments 131 until all the precast pile segments 131 are spliced.
[0068] Specifically, the first precast pile segment 131 is connected to the second splicing position 124 of the first precast pile 120 via the second splicing end 1313 and lowered; then, the second splicing end 1313 of the second precast pile segment 131 is connected to the third splicing position 1314 of the first precast pile segment 131; then, the two sides of the first limiting member 310 are respectively inserted into the limiting member installation holes of the two adjacent precast pile segments 131; and then the second limiting member 320 is inserted into the second installation groove 1312 of the two adjacent precast pile segments 131. The limit switch is moved, and the drainage board 200 is simultaneously inserted into the first installation groove 1311 of the two adjacent precast pile segments 131. Finally, the second precast pile segment 131 is lowered in the manner of splicing one segment at a time. Then, the splicing of the precast pile segments 131 is repeated until all the precast pile segments 131 are spliced. Then, the first splicing end 123 of the first precast pile 120 is inserted into the first splicing position 111 of the pile tip 110 to complete the splicing of the pile body 100 and ensure that the length of the spliced pile body 130 is suitable for the site.
[0069] Specifically, after the first limiting member 310, the second limiting member 320 and the drainage board 200 are installed, the binding member is wrapped around the circumference of the connection between two adjacent precast pile segments 131 to ensure that the first limiting member 310, the second limiting member 320 and the drainage board 200 can be firmly embedded in the precast pile segment 131, thereby improving the stability of the splicing of the precast pile segment 131.
[0070] S600. A top support is installed on the side of the spliced pile body 130 away from the first precast pile 120. One side of the top support is abutted against one side of the spliced pile body 130, and the other side is abutted against the construction support to prevent the spliced pile body 130 from floating.
[0071] S700. Remove the hollow sleeve and compact the soil around the pile 100 to complete the lowering of the pile 100.
[0072] Specifically, since the diameter of the top support is smaller than the inner diameter of the hollow sleeve, the top support continues to support the spliced pile 130 to prevent the pile 100 from floating, and then the hollow sleeve is removed; after the hollow sleeve is removed, the soil around the pile 100 is compacted by the special sleeve of the small static pressure pile driver to ensure that the pile 100 is in close contact with the surrounding soil.
[0073] After the construction of pile body 100 is completed, stress diffusion layer 140 is constructed to form composite foundation pile.
[0074] Specifically, in this embodiment, the stress diffusion layer 140 is a cover plate, which is made of reinforced concrete and filled with permeable materials such as crushed stone, medium and coarse sand, manufactured sand, and stone chips.
[0075] Specifically, the top support is removed, and the circular protrusion of the stress diffusion layer 140 is inserted into the third splicing position 1314 of the precast pile segment 131 of the spliced pile body 130 away from the pile tip 110, so as to prevent the spliced pile body 130 from floating by the gravity of the stress diffusion layer 140, thereby controlling the deformation of the pile body 100 and improving the stability of the pile body 100.
[0076] S900, a permeable cushion layer 700 with a thickness of 0.3~0.5m is laid on the side of the stress diffusion layer 140 away from the spliced pile body 130, and the stress diffusion layer 140 is embedded in the permeable cushion layer 700 to guide the pore water in the soil around the pile to the outside of the foundation; at the same time, a high-strength geogrid 800 is set on the side of the permeable cushion layer away from the stress diffusion layer 140 to reduce the stress concentration at the top of the composite foundation pile, so that the stress ratio between the composite foundation pile and the soil around the pile tends to be reasonable.
[0077] After the S1000 and high-strength geogrid 800 are completed, the road surface will be backfilled to complete the construction of the composite foundation piles.
[0078] The above embodiments are preferred embodiments of this application, but the implementation of this application is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this application shall be considered equivalent substitutions and shall be included within the protection scope of this application.
Claims
1. A composite foundation pile, characterized in that, include: The pile body includes a pile tip, a first precast pile, and a spliced pile body arranged sequentially along the length of the pile body. The spliced pile body includes multiple precast pile segments, and adjacent precast pile segments can be spliced together. A drainage board is provided on the outside of the pile body along the length direction of the pile body; The limiting component assembly includes a first limiting component and a second limiting component. The first limiting component is used to connect adjacent precast pile segments. The second limiting component is disposed on the outside of the spliced pile body along the length direction of the pile body and limits the multiple precast pile segments. A stress diffusion layer is provided at the top of the pile body along the length direction of the pile body, and the drainage board abuts against the stress diffusion layer. The stress diffusion layer is used to disperse stress and drain water.
2. The composite foundation pile according to claim 1, characterized in that, The precast pile segment is provided with a first installation groove and a second installation groove on the outer side along its length direction. The first installation groove and the second installation groove are arranged at intervals along the circumference of the precast pile segment. The drainage board and the second limiting member are respectively locked in the first installation groove and the second installation groove.
3. A composite foundation pile according to claim 2, characterized in that, The first mounting groove has mounting holes for limiting components on both sides along its length, and the two sides of the first limiting component are respectively connected to the mounting holes for limiting components of two adjacent precast pile segments.
4. A composite foundation pile according to claim 3, characterized in that, The first precast pile is provided with a third installation groove and a fourth installation groove along its length, and the third installation groove and the fourth installation groove are respectively connected to the first installation groove and the second installation groove; one end of the drainage board is inserted into the third installation groove, and the other end is along the first installation groove and abuts against the stress diffusion layer; one end of the second limiting member is inserted into the fourth installation groove, and the other end is along the second installation groove and abuts against the stress diffusion layer.
5. A composite foundation pile according to claim 1, characterized in that, The pile tip is provided with a first splicing position on the side near the first precast pile; the first precast pile is provided with a first splicing end on the side facing the pile tip, and a second splicing position on the other side; the first precast pile is connected to the first splicing position through the first splicing end; the precast pile segment is provided with a second splicing end on the side facing the first precast pile, and a third splicing position on the other side; the precast pile segment is connected to the second splicing position through the second splicing end, and two adjacent precast pile segments can be spliced together through the third splicing position and the second splicing end.
6. A composite foundation pile according to claim 1, characterized in that, The limiting component group also includes a binding component, which is arranged in a ring at the connection between the two precast pile segments to limit the first limiting component, the second limiting component, and the drainage board.
7. A composite foundation pile according to claim 1, characterized in that, The stress diffusion layer is at least one of a cover plate, a geogrid, and a geocell, and a permeable cushion layer is provided on the side of the stress diffusion layer away from the spliced pile body.
8. A composite foundation pile according to claim 1, characterized in that, The length of the precast pile segment ranges from 0.9m to 2.2m.
9. A composite foundation pile according to claim 7, characterized in that, The precast pile segments use a unit weight of 5kN / m. 3 ~10kN / m 3 It is made of lightweight materials.
10. A construction method for the composite foundation piles according to any one of claims 1-9, characterized in that, Includes the following steps: Level the site, measure and lay out the data, prefabricate the pile tip, the first prefabricated pile and the prefabricated pile segment, prepare the drainage board, and process the first limiting member and the second limiting member; Spiral drilling is performed on the road surface to a predetermined depth, and the hard shell layer is drilled through to form an installation hole; After the installation hole is drilled, align the center of the pile body and the installation hole, connect the pile tip to one side of the hollow sleeve, then press the hollow sleeve into the soft soil layer through the pile tip, and then press the hollow sleeve into the installation hole through the pile tip. The first precast pile is lowered through the hollow sleeve, the second limiting member is lifted up, and the second limiting member is connected to the first precast pile; The first precast pile segment is connected to the first precast pile and then lowered; next, the second precast pile segment is connected to the first precast pile segment, and then the first and second limiting members are used to lock the precast pile segment for limiting. After the drainage board is installed simultaneously, the second precast pile segment is lowered; then, the splicing of the precast pile segments is repeated until all the precast pile segments are spliced. Remove the hollow sleeve and compact the soil around the pile to complete the lowering of the pile. After the pile body construction is completed, the stress diffusion layer is constructed to form a composite foundation pile with drainage function.