Construction method of concave-convex type precast pile and precast pile
By filling the grooves of the precast pile body with reinforcing cementitious material and using an auxiliary filling cylinder, the problem of limited contact area between the precast pile and the soil is solved, achieving high friction and high bearing capacity of the precast pile, and adapting to construction methods for different soil types.
Patent Information
- Application Number
- CN202610358039.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Filing Date
- 2026-03-23
- Publication Date
- 2026-07-10
AI Technical Summary
The limited contact area between existing precast piles and the soil results in insufficient friction and low pile bearing capacity, preventing the concave-convex type precast piles from maximizing their performance.
Reinforcing cementitious material is filled into the groove of the precast pile body with concave-convex shape, and the filling is assisted by the feeding cylinder to keep the upper surface of the cementitious material higher than the contact area. Combined with the smooth precast pile to adapt to different soils, the total pile body is formed and the pile is repeatedly driven and connected until the design depth is reached.
It improves the friction between the precast pile and the soil, increases the effective diameter and contact area, enhances the bearing capacity of the pile body, adapts to different soil types, and realizes efficient pile driving and high bearing capacity of concave-convex precast piles.
Smart Images
Figure CN122358671A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of precast pile construction technology, and in particular to a method for constructing concave-convex precast piles and a precast pile. Background Technology
[0002] The main function of precast piles is to provide safe and reliable load-bearing support for buildings. The safe and reliable load-bearing capacity comes from the interaction force between the pile body and the soil. Pile foundations, which are mainly based on friction, rely on the friction force between the outer surface of the pile body and the soil to provide load-bearing capacity. Therefore, under the condition that the geological conditions remain unchanged, the load-bearing capacity of the pile body is mainly determined by the size of the outer surface area of the pile body.
[0003] A precast pile construction method is disclosed in the prior art. First, a pre-drilled hole is constructed at the pile location. Then, a heavy hammer is used to drive the precast pile into the hole to the designed depth, thereby improving efficiency, saving costs, and avoiding quality problems such as damage to the pile strength. The steps are as follows: 1) At the pile location, a pre-drilled hole is constructed using one or a combination of vibration, hammering, or spiral drilling; 2) The precast pile is placed vertically and aligned with the pile hole, and a special hammer cap is placed on top of the precast pile; 3) Above the precast pile, a heavy hammer is raised to gently tamp the special hammer cap with a low drop, causing the precast pile to sink downwards into the soil guided by the pile hole; 4) The hammering operation in step 3) is repeated until the precast pile is driven to the designed depth.
[0004] Regarding the aforementioned technologies, precast piles are driven to the designed depth by heavy hammering, and then the precast pile is supported by the friction between the pile body and the surrounding soil. However, the contact area between the precast pile and the soil is not significantly changed due to the limitations of the type of precast pile, resulting in insufficient friction between the precast pile and the soil, leading to low bearing capacity of the pile body. Even using concave-convex precast piles only increases the friction contact area and still cannot maximize the performance of the precast pile. Summary of the Invention
[0005] In order to maximize the performance of the concave-convex precast pile and improve the bearing capacity of the pile body, this application provides a construction method for concave-convex precast piles and a precast pile.
[0006] This application provides a construction method for concave-convex precast piles and the technical solution adopted by the precast piles as follows: In a first aspect, this application provides a method for constructing concave-convex precast piles, including: Step S1: Preparation for pile driving: Step S2: Centering and straightening and pile driving: After centering and straightening, the concave-convex precast pile is driven into the soil, and reinforcing cementitious material is filled into the groove of the concave-convex precast pile body when it is driven into the soil. Step S3: Pile body continuation: After coaxially connecting a supplementary precast pile to the upper end of the concave-convex precast pile, the total pile body is formed and continues to sink into the soil; Step S4: Repeat step S3 until the total pile body has sunk to the target depth in the soil, then terminate the pile driving. Step S5: Sawing the pile head.
[0007] By adopting the above technical solution, the pile driving area is first surveyed and marked out, and the prefabrication, testing, and transportation of the convex-concave precast piles are carried out. After the surveying and marking out work is completed, the pile driver moves into position according to the measured location guidance. Then, the convex-concave precast piles are centered, straightened, and driven. Specifically, the pile body is first lifted and lowered to near ground height, then the convex-concave precast piles are centered and straightened, and then driven into the soil. During the driving of the convex-concave precast piles, reinforcing cementitious material is filled into the grooves of the pile body. After the initial convex-concave precast pile body has sunk to a certain depth, the pile driving process is carried out. Body continuation: This involves coaxially connecting a supplementary precast pile to the upper end of the initial concave-convex precast pile to form the total pile body, which is then continuously driven into the soil. The pile driving and body continuation actions are repeated until the total pile body is driven into the soil to the design depth, at which point the pile driving is terminated. Finally, the sawing work is completed on the part of the pile head that exceeds the elevation. The reinforcing cementitious material can be cement mortar or other materials that can overflow into the soil and solidify with the soil to form a structural whole, thereby indirectly increasing the effective diameter and effective surface contact area of the total pile body, thereby increasing the friction and thus increasing the bearing capacity of the pile body, and maximizing the performance of the concave-convex precast pile.
[0008] In one specific implementation scheme, in step S2, while filling the groove of the precast pile body with reinforcing cementitious material during pile driving, the upper surface of the reinforcing cementitious material in the groove of the pile body is kept above the horizontal plane of the highest point of the contact area between the precast pile body and the soil.
[0009] By adopting the above technical solution, when filling the groove of the precast pile with reinforcing cementitious material while driving the pile, and keeping the upper surface of the reinforcing cementitious material in the groove higher than the highest point of the contact area between the precast pile and the soil, the filling of reinforcing cementitious material can be achieved while ensuring the driving speed of the precast pile, thus achieving a balance between speed and effect.
[0010] In one specific implementation, in step S2, a filling pit is excavated around the precast pile to be inserted into the ground, so that the filling pit is set around the precast pile, and reinforcing cementitious material is poured into the filling pit.
[0011] By adopting the above technical solution, by excavating a filling pit around the precast pile and setting the filling pit around the precast pile, and then filling the pile body groove with reinforcing cementitious material by pouring reinforcing cementitious material into the filling pit, two effects can be achieved. First, the filling equipment for reinforcing cementitious material is low-cost. Second, after filling, it can quickly sink into the soil, which can greatly reduce the situation of reinforcing cementitious material falling out of the pile body groove during the pile driving process.
[0012] In one specific implementation scheme, in step S2, a feeding cylinder with fixed settings and openings at both ends is processed. The feeding cylinder includes a conical section and a feeding cylinder body section connected coaxially. After the concave-convex precast pile passes through the feeding cylinder, reinforcing cementitious material is poured into the inner cavity of the feeding cylinder.
[0013] By adopting the above technical solution, a feeding cylinder with fixed installation and openings at both ends is used. After the concave-convex precast pile passes through the feeding cylinder, reinforcing cementitious material is poured into the inner cavity of the feeding cylinder. At the same time, the reinforcing cementitious material can flow into the groove of the pile body by gravity. The structural shape of the feeding cylinder itself and the cooperation with the concave-convex precast pile can increase the speed at which the reinforcing cementitious material enters. It can also avoid the interference of the surrounding environment, such as moisture in the soil, on the original reinforcing cementitious material during the filling process.
[0014] In one specific implementation scheme, the feeding cylinder section includes: Two fixed areas are connected to the conical segment, and the two fixed areas are distributed along the axial direction of the conical segment with an installation gap. The rotating area is rotatably connected to the fixed area, the rotating area is located within the installation gap, and the rotation axis of the rotating area is coaxial with the central axis of the fixed area.
[0015] By adopting the above technical solution, the designed feeding cylinder section can be connected to the conical section through the fixed area, and form a foundation for the rotating installation of the rotating area. The rotating area can increase the speed at which the reinforcing cementitious material is filled into the pile groove, thereby avoiding negative impacts on the sinking speed of the total pile.
[0016] In one specific implementation scheme, in step S3, the supplementary precast piles include concave-convex precast piles and / or smooth precast piles with smooth outer surfaces, and when the pile driving is terminated, the smooth precast piles correspond to the spatial height range where the collapsible loess is located.
[0017] By adopting the above technical solution, the designed pile body with smooth precast piles can avoid the downward force on the pile body caused by the increased friction after the cementing material is combined with the collapsible soil when working in collapsible soil, thereby increasing the adaptability of the construction method of this application to different types of soil.
[0018] In one specific implementation, step S1: pile driving preparation includes: S11: Conduct a detailed site survey, remove surface and underground obstacles, and excavate drainage ditches; S12: Surveying and setting out, precast pile prefabrication, testing and acceptance, and transportation; S13: Test piling after the piling machine is in place; S14: The pile body is lifted and lowered to near the ground.
[0019] By adopting the above technical solution, step S1 can eliminate potential fault points during the pile driving process through thorough and meticulous preliminary preparations, thereby ensuring the accuracy and efficiency of the subsequent pile driving process.
[0020] Secondly, this application provides a concave-convex precast pile.
[0021] A type of precast pile with concave and convex shapes, comprising: The precast pile body has multiple pile body grooves formed inward on its outer periphery. Adjacent pile body grooves are connected or separated, and the horizontal distance between the farthest point on the outer periphery of the precast pile body and the central axis of the precast pile body is equal.
[0022] By adopting the above technical solution, a concave-convex precast pile with multiple pile body grooves formed by the indentation on the outer periphery is designed, and the horizontal distance between the farthest point of the precast pile body on the outer periphery and the central axis of the precast pile body is equal. This increases the contact area with the soil and forms pile body grooves for accommodating reinforcing cementitious materials, thereby improving the performance of the pile body.
[0023] In one specific feasible implementation, the precast pile body is a solid pile or a hollow pile.
[0024] By adopting the above technical solutions, the type of precast pile body can be selected according to actual needs.
[0025] In one specific implementation scheme, both ends of the precast pile body are connected to pile head plates.
[0026] By adopting the above technical solution, the pile head plates at both ends of the precast pile body can be configured according to actual needs.
[0027] In summary, this application includes at least one of the following beneficial technical effects: The designed construction method for concave-convex precast piles involves coaxially connecting an initial concave-convex precast pile to a supplementary precast pile to form the total pile body, which is then continuously driven into the soil. The pile driving and pile body connection are repeated until the total pile body is driven into the soil to the design depth, at which point the pile driving is terminated. Finally, the portion of the pile head exceeding the elevation is sawn off. The reinforcing cementitious material can be cement mortar or other materials that can overflow into the soil and solidify with it to form a structural whole, thereby indirectly increasing the effective diameter and effective surface contact area of the total pile body, thus improving friction and the bearing capacity of the pile body, and maximizing the performance of the concave-convex precast pile.
[0028] The designed construction method for concave-convex precast piles involves filling the grooves of the pile body with reinforcing cementitious material while driving the pile, and keeping the upper surface of the reinforcing cementitious material in the grooves higher than the highest point of the contact area between the concave-convex precast pile and the soil. This method can ensure the speed of pile driving while filling the reinforcing cementitious material, achieving a balance between speed and effect.
[0029] The designed construction method for concave-convex precast piles involves excavating a filling pit around the precast pile and setting the filling pit around the pile. Then, reinforcing cementitious material is poured into the filling pit to fill the groove of the pile body. This method achieves two effects: first, the equipment for filling the reinforcing cementitious material is low-cost; second, after filling, it can quickly sink into the soil, which can greatly reduce the possibility of the reinforcing cementitious material falling out of the pile body groove during the pile driving process.
[0030] The designed construction method for concave-convex precast piles involves using a fixed feeding cylinder with openings at both ends. After the concave-convex precast pile passes through the feeding cylinder, reinforcing cementitious material is poured into the inner cavity of the feeding cylinder. This method allows the reinforcing cementitious material to flow into the groove of the pile body by gravity. The structural shape of the feeding cylinder itself, in conjunction with the concave-convex precast pile, can increase the speed at which the reinforcing cementitious material enters. It also avoids interference from the surrounding environment, such as moisture in the soil, on the original reinforcing cementitious material during the filling process. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the structure of the concave-convex precast pile in the construction method of the concave-convex precast pile in the embodiment of this application.
[0032] Figure 2 This is a schematic diagram of the construction state of filling using a filling pit in an embodiment of this application.
[0033] Figure 3 Is Figure 2 A schematic diagram of the structure after the pile body is continued on the foundation.
[0034] Figure 4 Is Figure 2 A schematic diagram of the structure of the supplementary precast piles when applied to collapsible soil.
[0035] Figure 5 This is a schematic diagram of the construction state of using a feed cylinder for filling in an embodiment of this application.
[0036] Figure 6 This is a cross-sectional view of the precast pile with concave and convex shapes in this application embodiment when it is a hollow pile.
[0037] Explanation of reference numerals in the attached drawings: 1. Concave-convex precast pile; 11. Precast pile body; 12. Pile body groove; 2. Supplementary precast pile; 3. Filling pit; 4. Mounting frame; 5. Feeding cylinder; 51. Conical section; 52. Feeding cylinder body section; 521. Fixing area; 522. Rotating area; 6. Pile head plate. Detailed Implementation
[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.
[0039] This application discloses a construction method for a concave-convex type precast pile 1 and the precast pile itself.
[0040] In the first aspect, the embodiments of this application disclose a construction method for a concave-convex precast pile 1.
[0041] Reference Figure 1 A construction method for a concave-convex type precast pile 1 and the precast pile includes: Step S1: Preparation for pile driving: Step S2: Centering and straightening and pile driving: After centering and straightening, the concave-convex precast pile 1 is driven into the soil, and reinforcing cementitious material is filled into the groove 12 of the pile body of the concave-convex precast pile 1 when it is driven into the soil; Specifically, the pile driving can be carried out by static pressure, hammer pressure, or other construction methods that can drive the concave-convex precast pile 1 into the soil. Step S3: Pile body splicing: After coaxially connecting a supplementary precast pile 2 to the upper end of the concave-convex precast pile 1, the total pile body is formed and continuously driven into the soil; when the top of the concave-convex precast pile 1 is close to the ground, the pile body splicing operation is carried out. Specifically, when splicing the pile body, the top end plate of the concave-convex precast pile 1 is cleaned first to remove mud, oil stains and laitance and other interfering materials. Then, the supplementary precast pile 2 is hoisted and aligned with the concave-convex precast pile 1. When aligned, it is fixed with a steel guide hoop to ensure that the center line misalignment between the concave-convex precast pile 1 and the supplementary precast pile 2 is less than the standard value. Then, the splicing is achieved by welding or mechanical connection. If welding is used for splicing, the welded area needs to be naturally cooled after welding to stabilize. If mechanical connection is used, various mechanical connection methods can be used, such as threaded, tapered, end plateless mechanical connection, meshing, or clamp mechanical joint. Step S4: Repeat step S3 until the total pile body has sunk to the target depth in the soil, then terminate the pile driving. Step S5: Sawing the pile head. After driving the pile to the design elevation, the pile head will be higher than the ground level or the design elevation of the foundation pit bottom. The part of the pile head that exceeds the elevation needs to be cut off. The pile head can be cut using hydraulic shears, a pile cutter, or a diamond wire saw. When cutting, first accurately mark the design pile top elevation cutting line on the pile body. Use hydraulic shears or a pile cutter to apply force smoothly along the cutting line to cut off the excess pile head. After the pile head is cut off, the pile top should be flat. If there is local concrete damage, it needs to be repaired and leveled with high-strength mortar or epoxy resin. The exposed pile top reinforcement should be cleaned and adjusted according to the design requirements in preparation for connection with the upper foundation.
[0042] In some embodiments of this application, step S1: pile driving preparation includes: S11: Conduct a detailed site survey, remove surface and underground obstacles, prepare water, electricity and roads, level and compact the site to ensure that the ground bearing capacity meets the operating requirements of heavy-duty press machines, and dig drainage ditches to reduce the possibility of water accumulation on the site. S12: Surveying and setting out, establishing a surveying control network, using a total station or GPS to accurately release the center point of each pile location and clearly mark it; precast piles, prefabrication, testing and acceptance, and transportation; S13: After the pile driver is in place, test piles are carried out. First, adjust the frame of the pile driver to be absolutely horizontal and ensure that the guide frame is set vertically. Then, test piles are carried out. The number of test piles shall not be less than one percent of the total number of engineering piles and not less than three. Based on the results of the test piles, determine the final pile driving force, final driving standard, pile splicing process and grouting parameters of reinforcing cementitious materials to provide a basis for formal pile driving. S14: The pile body is lifted and lowered to near the ground.
[0043] Furthermore, in step S2, while driving the pile, the reinforcing cementitious material is filled into the groove 12 of the precast pile 1, and the horizontal plane of the upper surface of the reinforcing cementitious material in the groove 12 is kept higher than the horizontal plane of the highest point of the contact area between the precast pile 1 and the soil. It should be noted that in this application, the reinforcing cementitious material includes, but is not limited to, various cementitious materials such as cement mortar and grouting material, as long as they can combine with the soil after entering the soil to improve the friction between the pile body and the soil.
[0044] Specifically, in step S2, a filling pit 3 is excavated around the soil entry area of the concave-convex precast pile 1, so that the filling pit 3 surrounds the concave-convex precast pile 1, and reinforcing cementitious material is poured into the filling pit 3. By excavating the filling pit 3 around the soil entry area of the concave-convex precast pile 1 and setting the filling pit 3 around the concave-convex precast pile 1, and then pouring reinforcing cementitious material into the filling pit 3 to fill the pile body groove 12 of the concave-convex precast pile 1 with reinforcing cementitious material, two effects can be achieved. First, the filling equipment for reinforcing cementitious material has low cost. Second, after filling, it can quickly sink into the soil, which can greatly reduce the situation where the reinforcing cementitious material falls out of the pile body groove 12 during the pile driving process.
[0045] In some other embodiments of this application, a different method is used to fill the reinforcing cementitious material. Specifically, in step S2, a feeding cylinder 5 with fixed installation and open ends is processed. The feeding cylinder 5 includes a conical section 51 and a feeding cylinder body section connected coaxially. The concave-convex precast pile 1 passes through the feeding cylinder 5 and then the reinforcing cementitious material is poured into the inner cavity of the feeding cylinder 5. In this application, the feeding cylinder 5 can be directly installed on the ground, or the feeding cylinder 5 can be separated from the ground by the mounting frame 4. The attached drawings of this embodiment show the form with the mounting frame 4. By setting the mounting frame 4 on the ground and fixing the feeding cylinder 5 with open ends on the mounting frame 4, and then letting the concave-convex precast pile 1 pass through the feeding cylinder 5 and then pouring the reinforcing cementitious material into the inner cavity of the feeding cylinder 5, the reinforcing cementitious material can flow into the pile body groove 12 by gravity. At the same time, the structural shape of the feeding cylinder 5 itself and the cooperation with the concave-convex precast pile 1 can be used to increase the speed of the reinforcing cementitious material entering. It can also avoid the interference of the surrounding environment, such as moisture in the soil, on the original reinforcing cementitious material during the filling process.
[0046] Furthermore, the cross-sectional shape of the feeding cylinder 5 section is the same as that of the concave-convex precast pile 1, but the inner cavity of the feeding cylinder 5 section is slightly larger than the outer diameter of the concave-convex precast pile 1. The feeding cylinder 5 section includes a fixed area 521 and a rotating area 522. There are two fixed areas 521, which are connected to the conical section 51. The two fixed areas 521 are distributed along the axial direction of the conical section 51 and have an installation gap. The rotating area 522 is rotatably connected to the fixed area 521. The rotating area 522 is located within the installation gap, and the rotation axis of the rotating area 522 is coaxial with the central axis of the fixed area 521. The fixed area 521 can be connected to the conical section 51 and forms a basis for the rotating installation of the rotating area 522. The rotating area 522 can increase the speed at which the reinforcing cementitious material is filled into the pile body groove 12, thereby avoiding negative impacts on the sinking speed of the total pile body.
[0047] In order to adapt the construction method to different soil types, in step S3, the supplementary precast piles 2 include concave-convex precast piles 1 and / or smooth precast piles with smooth outer surfaces, and when the pile driving is terminated, the smooth precast piles correspond to the spatial height range where the collapsible loess is located; the presence of smooth precast piles in the total pile body can avoid the downward force on the total pile body due to the increased friction after the cementing material is combined with the collapsible soil when working in collapsible soil, thereby increasing the adaptability of the construction method of this application to different types of soil.
[0048] In summary, a construction method for a concave-convex precast pile 1 includes: Step S1: Preparation for pile driving: S11: Conduct a detailed site survey, remove surface and underground obstacles, prepare water, electricity and roads, level and compact the site to ensure that the ground bearing capacity meets the operating requirements of heavy-duty press machines, and dig drainage ditches to reduce the possibility of water accumulation on the site. S12: Surveying and setting out, establishing a surveying control network, using a total station or GPS to accurately release the center point of each pile location and clearly mark it; precast piles, prefabrication, testing and acceptance, and transportation; S13: After the pile driver is in place, test piles are carried out. First, adjust the frame of the pile driver to be absolutely horizontal and ensure that the guide frame is set vertically. Then, test piles are carried out. The number of test piles shall not be less than one percent of the total number of engineering piles and not less than three. Based on the results of the test piles, determine the final pile driving force, final driving standard, pile splicing process and grouting parameters of reinforcing cementitious materials to provide a basis for formal pile driving. S14: The pile body is lifted and lowered to near the ground; Step S2: Centering and Straightening and Pile Driving: After centering and straightening, the concave-convex precast pile 1 is driven into the soil. While the concave-convex precast pile 1 is being driven, reinforcing cementitious material is filled into the groove 12 of the pile body. Specifically, the pile driving can be carried out by static pressure, hammer pressure, or other construction methods that can drive the concave-convex precast pile 1 into the soil. While filling the groove 12 of the pile body with reinforcing cementitious material, the upper surface of the reinforcing cementitious material in the groove 12 is kept higher than the highest point of the contact area between the concave-convex precast pile 1 and the soil. Step S3: Pile body continuation: After coaxially connecting a supplementary precast pile 2 to the upper end of the concave-convex precast pile 1, a total pile body is formed and continuously driven into the soil; when the top of the concave-convex precast pile 1 is close to the ground, the pile body continuation operation is performed, and the supplementary precast pile 2 includes the concave-convex precast pile 1 and / or a smooth precast pile with a smooth outer surface, and when the pile driving is terminated, the smooth precast pile corresponds to the spatial height range where the collapsible loess is located; the total pile body with smooth precast piles can avoid the downward force on the total pile body due to the increased friction after the cementing material is combined with the collapsible soil when working in collapsible soil, thereby increasing the adaptability of the construction method of this application to different types of soil; Specifically, when splicing the pile body, first clean the top end plate of the concave-convex precast pile 1, removing mud, oil stains, laitance and other interfering materials. Then, hoist the supplementary precast pile 2 and align it with the concave-convex precast pile 1. When aligning, use steel guide hoops to fix it, ensuring that the center line misalignment between the concave-convex precast pile 1 and the supplementary precast pile 2 is less than the standard value. Then, the splicing is achieved by welding or mechanical connection. If welding is used for splicing, the welded area needs to be naturally cooled after welding to stabilize. If mechanical connection is used, various mechanical connection methods can be used, such as threaded, tapered, end-plate-less mechanical connection, meshing, or clamp-type mechanical joints. Step S4: Repeat step S3 until the total pile body has sunk to the target depth in the soil, then terminate the pile driving. Step S5: Sawing the pile head. After driving the pile to the design elevation, the pile head will be higher than the ground level or the design elevation of the foundation pit bottom, and needs to be cut off. The pile head can be cut using hydraulic shears, a pile cutter, or a diamond wire saw. When cutting, first accurately mark the design pile top elevation cutting line on the pile body, and use hydraulic shears or a pile cutter to apply force smoothly along the cutting line to cut off the excess pile head. After the pile head is cut off, the pile top should be flat. If there is local concrete damage, it needs to be repaired and leveled with high-strength mortar or epoxy resin. The exposed pile top reinforcement should be cleaned and adjusted according to the design requirements in preparation for connection with the upper foundation.
[0049] The implementation principle of the construction method of the concave-convex precast pile 1 in this application embodiment is as follows: First, the measurement and layout of the pile driving area are carried out, and the prefabrication, testing and transportation of the concave-convex precast pile 1 are carried out. After the measurement and layout work is completed, the pile driver moves to the position according to the position guidance obtained by the measurement. Then, the concave-convex precast pile 1 is centered, straightened and driven. Specifically, the pile body is first lifted and lowered to near ground height. Then, the centering and straightening of the concave-convex precast pile 1 is completed. Then, the concave-convex precast pile 1 is driven into the soil. When the concave-convex precast pile 1 is driven into the soil, the groove 12 of the pile body of the concave-convex precast pile 1 is filled with reinforcing cementitious material. After the initial concave-convex precast pile 1 is driven into the soil, the pile body groove 12 of the concave-convex precast pile 1 is filled with reinforcing cementitious material. After the pile body has sunk to a certain depth, pile body continuation is carried out: that is, a supplementary precast pile 2 is coaxially connected to the upper end of the initial concave-convex precast pile 1 to form a total pile body and continue to sink into the soil. Then, the pile driving and pile body continuation actions are repeated until the total pile body sinks into the soil to the design depth, at which point the pile driving is terminated, and finally the sawing work of the pile head is completed. The reinforcing cementitious material can be cement mortar or other materials that can overflow into the soil and solidify with the soil to form a structural whole, thereby indirectly increasing the effective diameter and effective surface contact area of the total pile body, thereby increasing the friction force, thereby increasing the bearing capacity of the pile body, and giving full play to the performance of the concave-convex precast pile 1.
[0050] Secondly, this application discloses a concave-convex precast pile 1.
[0051] Reference Figures 1 to 6 A type of precast pile 1 with concave and convex shapes is used in the construction method of the precast pile 1 with concave and convex shapes disclosed in the first aspect of the present application. It includes a precast pile body 11, and a plurality of pile body grooves 12 are formed inward on the outer periphery of the precast pile body 11. Adjacent pile body grooves 12 can be connected or separated, and the horizontal distance between the farthest point of the outer periphery of the precast pile body 11 and the central axis of the precast pile body 11 is equal. The precast pile body 11 can be a solid pile or a hollow pile. The cross-sectional shape of the precast pile body 11 can be a circle, a square, a triangle, or other polygonal shapes. For the hollow pile type precast pile body 11, the shape of its inner hole can also be a circle, a triangle, or other polygonal hollow shapes.
[0052] Furthermore, the precast pile body 11 can simultaneously contain two adjacent pile body grooves 12 that are interconnected and two adjacent pile body grooves 12 that are separated. It should also be noted that in this application, the shape of the pile body groove 12 can be dot-shaped, block-shaped, column-shaped, step-shaped, spherical, honeycomb-shaped, or it can be cone-shaped, frustum-shaped, triangular, triangular pyramid (including frustum-shaped), multi-faceted pyramid (including multi-faceted frustum-shaped), circular, non-circular closed line, triangular, rectangular, polygonal, trapezoidal and other shapes. It can also be a combination of multiple shapes or a combination of various non-dot-shaped (such as strip-shaped, ring-shaped, non-closed ring-shaped concave-convex structures and dot-shaped concave-convex structures).
[0053] More specifically, in this application, the two ends of the precast pile body 11 may be connected to the pile head plate 6 or not. In this embodiment, both ends of the precast pile body 11 are connected to the pile head plate 6.
[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A construction method for a concave-convex precast pile (1), characterized in that: include: Step S1: Preparation for pile driving: Step S2: Centering and straightening and pile driving: After centering and straightening, the concave-convex precast pile (1) is driven into the soil, and when the concave-convex precast pile (1) is driven in, the pile groove (12) of the concave-convex precast pile (1) is filled with reinforcing cementitious material. Step S3: Pile body continuation: After coaxially connecting a supplementary precast pile (2) to the upper end of the concave-convex precast pile (1), the total pile body is formed and continuously driven into the soil; Step S4: Repeat step S3 until the total pile body has sunk to the target depth in the soil, then terminate the pile driving. Step S5: Sawing the pile head.
2. The construction method of the concave-convex precast pile (1) according to claim 1, characterized in that: In step S2, while driving the pile, the reinforcing cementitious material is filled into the pile groove (12) of the concave-convex precast pile (1), and the upper surface of the reinforcing cementitious material in the pile groove (12) is kept higher than the highest point of the contact area between the concave-convex precast pile (1) and the soil.
3. The construction method of the concave-convex precast pile (1) according to any one of claims 1 or 2, characterized in that: In step S2, a filling pit (3) is dug around the convex-concave precast pile (1) so that the filling pit (3) surrounds the convex-concave precast pile (1) and reinforcing cementitious material is poured into the filling pit (3).
4. The construction method of the concave-convex precast pile (1) according to any one of claims 1 or 2, characterized in that: In step S2, a fixed feeding cylinder (5) with openings at both ends is processed. The feeding cylinder (5) includes a conical section (51) and a feeding cylinder (5) body section connected coaxially. The concave-convex precast pile (1) is passed through the feeding cylinder (5) and then reinforced cementitious material is poured into the inner cavity of the feeding cylinder (5).
5. The construction method of the concave-convex precast pile (1) according to claim 4, characterized in that: The feeding cylinder (5) section includes: Two fixed areas (521) are connected to the conical segment (51). The two fixed areas (521) are distributed along the axial direction of the conical segment (51) and have an installation gap. A rotating area (522) is rotatably connected to the fixed area (521). The rotating area (522) is located within the installation gap, and the rotation axis of the rotating area (522) is coaxial with the central axis of the fixed area (521).
6. The construction method of the concave-convex precast pile (1) according to claim 1, characterized in that: In step S3, the supplementary precast piles (2) include concave-convex precast piles (1) and / or smooth precast piles with smooth outer surfaces, and when the pile driving is terminated, the smooth precast piles correspond to the spatial height range where the collapsible loess is located.
7. The construction method of the concave-convex precast pile (1) according to claim 1, characterized in that: Step S1: Piling preparation includes: S11: Conduct a detailed site survey, remove surface and underground obstacles, and excavate drainage ditches; S12: Surveying and setting out, precast pile prefabrication, testing and acceptance, and transportation; S13: Test piling after the piling machine is in place; S14: The pile body is lifted and lowered to near the ground.
8. A type of precast pile with concave and convex shapes (1), characterized in that: The method for implementing the precast pile (1) with concave and convex shapes as described in any one of claims 1-7 includes: The precast pile body (11) has multiple pile body grooves (12) formed inward on its outer periphery. Adjacent pile body grooves (12) are connected or separated, and the horizontal distance between the farthest point of each part of the outer periphery of the precast pile body (11) and the central axis of the precast pile body (11) is equal.
9. The concave-convex precast pile (1) according to claim 8, characterized in that: The precast pile body (11) is a solid pile or a hollow pile.
10. The concave-convex precast pile (1) according to claim 8, characterized in that: Both ends of the precast pile body (11) are connected to pile head plates (6).