Post-grouting miniature pile group foundation structure
By using wing plate components and slurry guide plates in the micro pile foundation structure, the problem of insufficient concentration of slurry diffusion when grouting at the pile end is solved, forming a larger stress area and higher friction resistance, which significantly improves the stability and bearing capacity of the pile foundation.
Patent Information
- Application Number
- CN202422198602.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-09
AI Technical Summary
When grouting at the pile end, the slurry diffusion is not concentrated enough, making it difficult to form an effective enlarged head, resulting in a relatively small force area at the pile end, limited load capacity, and a small friction resistance between the pile side and the soil, resulting in poor overall stability of the pile foundation.
The rear grouting micro pile group foundation structure is adopted, including the support, cast-in pile mechanism and wing assembly. The casting pile mechanism injects slurry through grouting pipes and steel flower pipes. When the wing plate assembly grouts at the pile end, the slurry diffuses downward more concentratedly, forming a pile end enlarged head, and guides the slurry to seep along the pile body through the slurry guide plate to form an extruded stone body and enhance the friction resistance of the pile side.
Through the umbrella-shaped wing assembly and the "open-umbrella-type" trapezoidal guide plate, the slurry diffuses more concentratedly, forming a larger stress area and improving the bearing capacity at the pile end; at the same time, the extruded stone body on the pile side significantly improves friction resistance, enhancing the overall stability and safety of the pile foundation.
Smart Images
Figure CN222962105U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to a post-grouting micro-pile group foundation structure. Background Art
[0002] In the Yellow River Basin area, the foundation soil is mainly composed of ultra-thick clay layers and sandy soil layers with extremely poor gradation, high porosity and large compressibility, and the groundwater level is high. Soft mud layers with different thicknesses are often interspersed between layers in some areas. Therefore, the proportion of foundation settlement in the total settlement is larger. The requirements for differential settlement and load level of large bridge foundations are very strict. Factors such as complex foundation soil conditions and uneven loads of the upper building structure will all cause uneven settlement of the building structure foundation, resulting in cracking and even damage of the upper components. Therefore, the selection of the foundation form is very important. The pile foundation has the advantages of fast construction speed and high bearing capacity and is widely used in engineering practice. However, when facing the slope sections with large terrain undulations and narrow construction working surfaces in this area, due to terrain conditions, the construction working surface is often relatively narrow, and it is difficult for large pile foundation equipment to enter the site for construction. Deep and long large-diameter pile foundations are often difficult to implement. Therefore, the micro-pile technology is often adopted.
[0003] In order to solve the problems of the traditional micro-cast-in-place piles, such as small size, low pile body strength, and easy occurrence of large deformation, tensile cracking, uneven settlement, etc. during use, the existing technology improves the bearing capacity of micro-piles through post-grouting technology. However, the micro-piles using post-grouting technology still have problems: when grouting at the pile end in the traditional structure, the slurry diffusion is not concentrated enough, and it is difficult to form an effective enlarged head, resulting in a relatively small pile end bearing area and limited bearing capacity. Moreover, the frictional resistance between the pile side of the micro-pile and the soil is small, resulting in poor overall stability of the pile foundation. Summary of the Utility Model
[0004] The purpose of the utility model is to propose a post-grouting micro-pile group foundation structure to solve the problems that when grouting at the existing pile end, the slurry diffusion is not concentrated enough, it is difficult to form an effective enlarged head, resulting in a relatively small pile end bearing area and limited bearing capacity, and the frictional resistance between the pile side of the micro-pile and the soil is small, resulting in poor overall stability of the pile foundation.
[0005] In order to achieve the above purpose, the utility model adopts the following technology: A post-grouting micro-pile group foundation structure, comprising:
[0006] A bearing platform;
[0007] A cast-in-place pile mechanism, the cast-in-place pile mechanism includes a steel reinforcement cage connected to the bearing platform, a grouting pipe is arranged on the steel reinforcement cage, a perforated steel pipe sleeved outside the steel reinforcement cage is arranged on the grouting pipe, and a wing plate assembly is arranged on the steel reinforcement cage.
[0008] As a further description of the above technical solution: The wing plate assembly includes an installation clamp sleeved outside the steel reinforcement cage, and a slurry guiding plate is hinged on the installation clamp through a hinge seat.
[0009] As a further description of the above technical solution: The installation clamp includes a first clamp body and a second clamp body that cooperate to form a circular clamp, and the first clamp body and the second clamp body are connected by connecting bolts.
[0010] As a further description of the above technical solution: Through holes are formed in both the first clamp body and the second clamp body, and the installation clamp is bound to the steel reinforcement cage by steel wires passing through the through holes.
[0011] As a further description of the above technical solution: A connecting seat is fixedly connected to the slurry guiding plate, and a connecting hole matching the hinge seat is formed in the connecting seat.
[0012] As a further description of the above technical solution: A plurality of slurry holes are formed in the slurry guiding plate and are arranged at equal intervals along its height direction.
[0013] As a further description of the above technical solution: The grouting pipe is communicated with the steel pipe with holes through a connecting pipe.
[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:
[0015] 1. The wing plate assembly with an umbrella-shaped structure can make the slurry more concentrated in downward diffusion to form an enlarged pile tip during pile tip grouting. The "umbrella-opening type" trapezoidal slurry guiding plate on the pile side can guide the slurry to seep downward along the pile body and form an extrusion-expanded stone body on the pile side, avoiding the occurrence of the situation that the small-sized micro pile is easy to break through the pile side and the slurry gushes out at the pile top during grouting. The enlarged head formed by pile tip grouting directly increases the stress area of the pile tip, enabling the pile tip to bear a greater load. The trapezoidal slurry guiding plate guides the slurry to form an extrusion-expanded stone body on the pile side, and these stone bodies significantly improve the frictional resistance of the pile side, thereby improving the overall stability and safety of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Shows a schematic diagram of the overall structure provided by an embodiment of the present utility model;
[0017] Figure 2 Shows a schematic diagram of the structure of a cast-in-place pile mechanism provided by an embodiment of the present utility model;
[0018] Figure 3 Shows a schematic diagram of the structure of the wing plate assembly provided by an embodiment of the present utility model;
[0019] Figure 4 Shows a schematic diagram of the structure of the installation clamp provided by an embodiment of the present utility model;
[0020] Figure 5 A schematic diagram of the structure of a pulp guide plate provided according to an embodiment of the utility model is shown;
[0021] Figure 6 A schematic diagram of the connection between a grouting pipe and a steel flower pipe provided according to an embodiment of the utility model is shown.
[0022] Legend:
[0023] 1. Cap; 2. Steel cage; 3. Grouting pipe; 31. Connecting pipe; 4. Steel flower pipe; 5. Wing plate assembly; 51. Mounting clamp; 511. First hoop body; 512. Second hoop body; 513. Connecting bolt; 514. Through hole; 52. Hinge seat; 53. Slurry guide plate; 531. Connecting seat; 532. Connecting hole; 533. Slurry hole. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] Reference Figures 1-6 A post-grouting micro pile group foundation structure provided in this embodiment includes a cap 1 and a cast-in-place pile mechanism. The cast-in-place pile mechanism includes a steel cage 2 connected to the cap 1, a grouting pipe 3 is provided on the steel cage 2, and a steel flower pipe 4 is provided on the grouting pipe 3 and is sleeved on the outside of the steel cage 2. The grouting pipe 3 is connected to the steel flower pipe 4 through a connecting pipe 31, and a wing plate assembly 5 is provided on the steel cage 2.
[0026] In the utility model, after the pile hole is formed, the steel cage 2 is lowered into the pile hole, and the prepared cement mortar is injected into the grouting pipe 3 through a pressure pump, and then the cement mortar in the grouting pipe 3 enters the steel flower pipe 4 through the connecting pipe 31, and is poured into the soil layer through the steel flower pipe 4. When the cement mortar in the steel flower pipe 4 is poured, the wing plate assembly 5 is opened due to the buoyancy of the cement mortar, and the bearing capacity of the bored pile is strengthened through the wing plate assembly 5, thereby improving the stability of the entire pile foundation. The cap 1 connects several bored pile mechanisms together to form a pile group, and the gravity of the high-speed railway bridge and the pier body is first transmitted to each micro-pile through the cap 1.
[0027] Specifically, Figure 2 and Figure 3 As shown, the wing plate assembly 5 includes a mounting clamp 51 sleeved on the outside of the steel cage 2, and a slurry guide plate 53 is hinged to the mounting clamp 51 through a hinge seat 52.
[0028] The slurry guide plate 53 is arranged outside the steel cage 2 by means of the mounting clamp 51. The hinged slurry guide plate 53 naturally hangs down under the action of gravity when there is no grouting. At this time, a number of slurry guide plates 53 are stacked on each other. When grouting is performed by the grouting pipe 3, cement mortar is ejected through the steel flower pipe 4. At this time, the slurry guide plate 53 is opened by the impact of the cement mortar on the one hand, and on the other hand, it is stretched open by the buoyancy of the cement mortar due to the continuous injection of the cement mortar. The stretched slurry guide plate 53 forms an annular flange body. The "umbrella-shaped" trapezoidal slurry guide plate 53 is used to guide the diffusion direction of the slurry. When grouting the pile end, the slurry is more concentrated to diffuse downward to form an expanded head at the pile end. The "umbrella-shaped" trapezoidal slurry guide plate 53 on the pile side can guide the slurry to flow downward along the pile body and form an extruded stone body on the pile side, thereby avoiding the occurrence of a situation where the micro-pile is small in size and the grouting easily breaks through the pile side and slurry pops out at the pile top.
[0029] It should be noted that the hinge seat 52 is provided with a limit plate, so that the maximum opening angle of the slurry guide plate 53 is less than ninety degrees, thereby preventing the slurry guide plate 53 from turning over during the opening process.
[0030] Specifically, Figure 3 and Figure 4 As shown, the mounting clamp 51 includes a first clamp body 511 and a second clamp body 512 that cooperate with each other to form a circular clamp, and the first clamp body 511 and the second clamp body 512 are connected by a connecting bolt 513.
[0031] Among them, the first hoop body 511 and the second hoop body 512 of the installation clamp 51 can be separated, so that the installation and disassembly of the slurry guide plate 53 can be convenient. When installing, the slurry guide plate 53 is connected to the hinge seat 52 of the first hoop body 511 and the second hoop body 512, and then the first hoop body 511 and the second hoop body 512 are connected by connecting bolts 513 and fixed on the outside of the steel cage 2.
[0032] It should be noted that a through hole 514 is formed on both the first hoop body 511 and the second hoop body 512 , and the mounting clamp 51 is bound to the steel cage 2 by a steel wire passing through the through hole 514 .
[0033] Among them, after the circular clamp formed by the first hoop body 511 and the second hoop body 512 is installed on the outside of the steel cage 2, in order to ensure the stability of the entire wing plate assembly 5, the steel wire is passed through the through hole 514, so that the installation clamp 51 is bound to the steel cage 2 by the steel wire to achieve further fixation, ensuring that the wing plate assembly 5 will not loosen and fall on the steel cage 2.
[0034] Specifically, Figure 3 and Figure 5 As shown, a connecting seat 531 is fixedly connected to the slurry guide plate 53 , and a connecting hole 532 matching with the hinge seat 52 is formed on the connecting seat 531 .
[0035] Among them, a screw rod passes through the hinge seat 52, and the screw rod passes through the connection hole 532 of the connection seat 531. The diameter of the screw rod is slightly smaller than the diameter of the connection hole 532. The connection seat 531 and the screw rod are used to realize the hinge connection between the slurry guide plate 53 and the hinge seat 52. When the screw rod on the hinge seat 52 is unscrewed, the slurry guide plate 53 can be disassembled.
[0036] It should be noted that a plurality of slurry holes 533 are arranged at equal intervals along the height direction of the slurry guide plate 53.
[0037] Among them, the slurry guide plate 53 forms a circumferential flange body after being expanded. Since the circumferential flange bodies are distributed in multiple layers on the steel reinforcement cage 2, in order to ensure that the cement mortar between each layer of circumferential flange bodies can flow mutually, the flow of the cement mortar is realized through the slurry guide plate 53. Without affecting the expansion of the slurry guide plate 53, it is ensured that the cement mortar can be evenly poured into the soil layer, thereby improving the overall stability of the pile foundation.
[0038] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.
Claims
1. A post-grouting micro pile group foundation structure, characterized in that: include: Platform(1); A bored pile mechanism, comprising a steel cage (2) connected to a cap (1), a grouting pipe (3) being provided on the steel cage (2), a steel flower pipe (4) being provided on the grouting pipe (3) and being sleeved on the outside of the steel cage (2), and a wing plate assembly (5) being provided on the steel cage (2).
2. The post-grouting micro-pile group foundation structure according to claim 1, characterized in that: The wing plate assembly (5) comprises a mounting clamp (51) sleeved on the outside of the steel cage (2), and a slurry guide plate (53) is hingedly connected to the mounting clamp (51) via a hinge seat (52).
3. The post-grouting micro-pile group foundation structure according to claim 2, characterized in that: The mounting clamp (51) comprises a first clamp body (511) and a second clamp body (512) which cooperate with each other to form a circular clamp, and the first clamp body (511) and the second clamp body (512) are connected by a connecting bolt (513).
4. The post-grouting micro-pile group foundation structure according to claim 3, characterized in that: The first hoop body (511) and the second hoop body (512) are both provided with through holes (514), and the mounting clamp (51) is bound to the steel cage (2) via a steel wire passing through the through holes (514).
5. The post-grouting micro-pile group foundation structure according to claim 2, 3 or 4, characterized in that: A connecting seat (531) is fixedly connected to the pulp guide plate (53), and a connecting hole (532) matching with the hinge seat (52) is provided on the connecting seat (531).
6. The post-grouting micro-pile group foundation structure according to claim 5, characterized in that: The slurry guide plate (53) is provided with a plurality of slurry holes (533) arranged at equal intervals along its height direction.
7. The post-grouting micro-pile group foundation structure according to claim 1, characterized in that: The grouting pipe (3) is connected to the steel flower pipe (4) via a connecting pipe (31).